CN117950184B - Optical scattering noise suppression method in liquid cold light module - Google Patents
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Abstract
The invention belongs to the technical field of optical modules, and particularly relates to an optical scattering noise suppression method in a liquid-cooled optical module. The method comprises the following steps: step 1: constructing a wave front propagation equation of light waves transmitted in the liquid cooling optical module, obtaining a wave front function of the light waves, and applying a nonlinear gradient operator to the wave front function to determine the position of a scattering source; step 2: based on the wavefront function, constructing a nonlinear transfer function of the light wave, and based on the nonlinear transfer function, calculating the intensity distribution of nonlinear scattered light; step 3: calculating a first signal-to-noise ratio; performing nonlinear phase correction on the light wave to remove the influence of a scattering source, and calculating the intensity distribution of new nonlinear scattered light; step 4: calculating a second signal-to-noise ratio; step 5: and when the difference value between the second signal-to-noise ratio and the first signal-to-noise ratio is maximum, selecting a first group of parameters and a second group of parameters corresponding to the second signal-to-noise ratio with the maximum value as operation parameters. The invention effectively inhibits the optical scattering noise of the liquid cold light module.
Description
Technical Field
The invention belongs to the technical field of optical modules, and particularly relates to an optical scattering noise suppression method in a liquid-cooled optical module.
Background
The fields of optical imaging and sensing have been important fields of research in science and engineering, covering a wide range of applications including medical imaging, semiconductor manufacturing, astronomical observation, and bioscience research. With the continuous development of technology, there is an increasing demand for high resolution and high quality imaging, and optical scattering noise has been one of the main factors restricting the performance of optical systems.
In optical imaging and sensing applications, diffuse noise is a serious problem, and interference caused in the optical path reduces the quality of the signal and the sharpness of the image. The scattering noise is typically caused by minor non-uniformities in the surface of the sample or optical element that lead to scattering and diffraction of light rays, ultimately affecting imaging and sensing performance.
Over the past decades, scientists and engineers have proposed various scatter suppression methods aimed at reducing or eliminating scatter noise in optical systems. These methods include: surface polishing and coating techniques: the surface of the optical element is polished and coated to reduce surface non-uniformity, thereby reducing scattering. However, these methods generally require a complicated preparation process and do not completely eliminate scattering. Interference and interference cancellation: scattering is counteracted by interference techniques and the scattering noise is reduced by the principle of phase interference. These methods require high precision interference devices and are costly. Nonlinear optical techniques: the nonlinear optical effect is used to suppress scattering noise, such as optical coherent modulation and optical phase conjugation. However, these methods generally require complex experimental setup and high power lasers, limiting their field of application.
Disclosure of Invention
The invention mainly aims to provide the method for inhibiting the optical scattering noise in the liquid-cooled light module, which effectively inhibits the optical scattering noise of the liquid-cooled light module.
In order to solve the above technical problems, the present invention provides a method for suppressing optical scattering noise in a liquid crystal light module, the method comprising:
step 1: constructing a wave front propagation equation of light waves transmitted in the liquid cooling optical module, obtaining a wave front function of the light waves, and applying a nonlinear gradient operator to the wave front function to determine the position of a scattering source;
Step 2: based on the wavefront function, constructing a nonlinear transfer function of the light wave, and based on the nonlinear transfer function, calculating the intensity distribution of nonlinear scattered light;
step 3: calculating a first signal-to-noise ratio; performing nonlinear phase correction on the light wave to remove the influence of a scattering source, and calculating the intensity distribution of new nonlinear scattered light;
Step 4: calculating a second signal-to-noise ratio; the following procedure is iterated for a specified number of times: returning to the step 2, adjusting the first group of parameters of the nonlinear transfer function constructed in the step 2 and adjusting the second group of parameters of the nonlinear phase correction of the optical wave in the step 3;
step 5: and when the difference value between the second signal-to-noise ratio and the first signal-to-noise ratio is maximum, selecting a first group of parameters and a second group of parameters corresponding to the second signal-to-noise ratio with the maximum value as operation parameters.
Further, the wavefront propagation equation constructed in step 1 is expressed using the following formula:
Wherein: Φ (r) is a wavefront function, representing the phase of the light wave at location r; phi 0 (r) is the initial wavefront phase; k is the wave number; r' and r "are the location of the source and the location of the point in the medium; dA is the area element on the source face; χ (r ") is the nonlinear polarization of the r" position in the medium.
Further, in step 1, a nonlinear gradient operator is applied to the wavefront function using the following formula:
Wherein, Is the gradient of the wavefront function at position r, representing the phase gradient of the light wave; /(I)This is the gradient of the wavefront function at location r' to describe the phase change of the light wave; /(I)This term represents the second order gradient of the wavefront function at position r'; /(I)Representing the third order gradient of the wavefront function at position r' "; χ (r ') represents the nonlinear nature of the medium at position r'; χ (3) (r ' ") is the third order nonlinear polarization of the medium at position r '", representing the high order nonlinear properties of the medium at position r ' "; dV is the volume element in the medium; p is the color temperature of the liquid cold light module; l is the thermal conductivity of the liquid cold light module.
Further, the gradient of the wavefront function at position r is foundThe maximum value point or the minimum value point of the scattering source is set as the position X of the scattering source.
Further, in step 2, based on the wavefront function, a nonlinear transfer function of the light wave is constructed using the following formula:
wherein H (r) is a nonlinear transfer function; the color temperature P of the liquid-cooled light module and the thermal conductivity L of the liquid-cooled light module together form a first set of parameters of the nonlinear transfer function.
Further, in step 2, the intensity distribution of the nonlinear scattered light is calculated using the following formula:
Wherein I (r) is the intensity distribution at position r; lambda is the wavelength of the light wave; z is the distance from the position r to the liquid cold light module; r is the beam diameter; r is the radial distance from the liquid light source at the position r; alpha is the absorption coefficient; θ is the beam polarization angle at position r.
Further, in step 3, the first signal-to-noise ratio SNR (r) is calculated by the following formula:
wherein ||r-x|| represents the distance between the calculated position r and the position X; σ (r) is the background noise intensity at position r.
Further, in the step 3, nonlinear phase correction is performed on the optical wave by the following formula:
Wherein, The value range is 0.3 to 0.5 for the first correction coefficient; beta is a second correction coefficient, and the value range is 1.1 to 1.6; h' (r) is a transfer function after nonlinear phase correction; first correction coefficient/>And the second correction factor beta together form a second set of parameters.
Further, in step 3, the intensity distribution of the new nonlinear scattered light is calculated using the following formula:
I′(r)＝|H′(r)|2；
where I' (r) is the intensity distribution of the new nonlinear scattered light.
Further, a second signal-to-noise ratio SNR' (r) is calculated using the following formula:
the method for inhibiting the optical scattering noise in the liquid-cooled light module has the following beneficial effects: in optical systems, scattered noise often results in blurring of the image and loss of detail, degrading the imaging quality. By adopting the nonlinear optical technology, the invention can effectively inhibit scattering noise, thereby improving the definition and resolution of the image. This is very important for high precision imaging in the fields of medical imaging, astronomical observation, semiconductor manufacturing, etc., and can help researchers and engineers obtain more accurate image data, supporting deeper analysis and decision-making. The invention determines the position of a scattering source by constructing a wave-front propagation equation and applying a nonlinear gradient operator, and then carries out nonlinear phase correction. The process effectively reduces the influence of the scattering source on the optical system and improves the definition and resolution of the image. This is important for high-precision imaging in the fields of medical imaging, semiconductor manufacturing, etc., and helps to obtain more accurate image data. By constructing a nonlinear transfer function, the present invention can calculate the intensity distribution of nonlinear scattered light. Nonlinear gradient operators help reduce distortion of the optical wave phase, especially under the influence of scattering noise. This improves the accuracy of the imaging. By determining the gradient extremum points, the location of the scattering source can be precisely determined, thereby better understanding the structure and characteristics of the sample. By constructing and optimizing the nonlinear transfer function of the light wave, the method remarkably improves the imaging quality. The resolution and clarity of the optical system is improved, helping to more accurately view and analyze the sample. The method effectively suppresses optical scattering noise by reducing the influence of scattering sources. This reduces noise interference, increases the signal to noise ratio, and helps to more accurately detect and measure targets.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a method for suppressing optical scattering noise in a liquid crystal module according to an embodiment of the invention.
Detailed Description
The method of the present invention will be described in further detail with reference to the accompanying drawings.
Example 1: referring to fig. 1, a method of suppressing optical scattering noise in a liquid-cooled light module, the method comprising:
step 1: constructing a wave front propagation equation of light waves transmitted in the liquid cooling optical module, obtaining a wave front function of the light waves, and applying a nonlinear gradient operator to the wave front function to determine the position of a scattering source;
Wavefront propagation equations are mathematical descriptions of light wave transmissions that take into account the phase or amplitude information of light. This equation describes how light waves propagate in a liquid-cooled module based on propagation characteristics of light, such as refraction, diffraction, and scattering. In general, wavefront propagation equations can be derived using Huygens-Fresnel principles or wave equations, among other methods. Nonlinear gradient operators are a mathematical tool for calculating the gradient (or derivative) of a function at different points. In this step, the nonlinear gradient operator is used to perform gradient calculation on the wavefront function to obtain the spatial variation information of the wavefront function. This may help to determine the location of scattering sources present in the optical system.
Step 2: based on the wavefront function, constructing a nonlinear transfer function of the light wave, and based on the nonlinear transfer function, calculating the intensity distribution of nonlinear scattered light;
In optical systems, a transfer function is typically used to describe how a light wave propagates through the system. The conventional transfer function is linear and only considers linear optical effects such as transmittance, diffraction, etc. However, in the presence of scattering noise, nonlinear optical effects are also important, and thus the introduction of nonlinear transfer functions is required. Nonlinear transfer functions include more complex optical effects such as optical phase modulation in nonlinear media, and the like. Based on the constructed nonlinear transfer function, a numerical calculation can be performed to simulate the intensity distribution of nonlinear scattered light. This can be achieved by solving the coupling between the wavefront propagation equation and the nonlinear transfer function. The calculated intensity distribution describes the transmission of the light wave in the liquid-cooled light module, including the distribution of scattering noise. The introduction of a nonlinear transfer function allows a more comprehensive modeling of the optical system, including nonlinear effects. This helps to understand the behaviour of the system more accurately. The intensity distribution of the nonlinear scattered light can be calculated using the nonlinear transfer function. This is important because scattering noise is often the dominant source of interference in optical systems, and accurately calculating their distribution can help suppress noise.
Step 3: calculating a first signal-to-noise ratio; performing nonlinear phase correction on the light wave to remove the influence of a scattering source, and calculating the intensity distribution of new nonlinear scattered light;
The first signal-to-noise ratio is typically a metric used to evaluate performance in the presence of a scattering source in the optical system. It is the ratio of signal strength to noise strength. In this step, a first signal-to-noise ratio of the system is first calculated, where the signal is part of the desired signal (without scattering noise), which is noise caused by the scattering source. Once the first signal-to-noise ratio is calculated, the next goal is to remove the effect of the scattering source by nonlinear phase correction. This is achieved by adjusting the phase of the light wave. Nonlinear phase correction is generally a feedback control process, and by precisely adjusting the phase of the light wave, wavefront distortion caused by a scattering source is eliminated as much as possible. The calculation of the first signal-to-noise ratio may provide a quantitative measure of the impact of the scattering source on system performance. A lower first signal-to-noise ratio indicates a greater influence of scattering noise. Nonlinear phase correction is a process of correcting wavefront distortion caused by a scattering source by adjusting the phase of an optical wave. This can significantly mitigate the impact of the scattering source on the optical system, thereby improving the performance of the system.
Step 4: calculating a second signal-to-noise ratio; the following procedure is iterated for a specified number of times: returning to the step 2, adjusting the first group of parameters of the nonlinear transfer function constructed in the step 2 and adjusting the second group of parameters of the nonlinear phase correction of the optical wave in the step 3;
Step 4 uses an iterative approach to continuously adjust both sets of parameters. The first set of parameters relates to the construction of a nonlinear transfer function, while the second set of parameters relates to the application of nonlinear phase correction. These parameters can control the propagation and phase adjustment of the light wave, thereby affecting the suppression effect of the scattering noise. Through the iterative process, parameters of the nonlinear transfer function and nonlinear phase correction can be continuously adjusted to find the optimal combination, so that the scattering noise suppression effect is optimized. This may significantly improve the performance of the system. The iterative process of step 4 allows the system to dynamically adjust parameters according to the actual situation. This adaptation enables the system to cope with scattered noise under different conditions, thereby improving the robustness of the system.
Step 5: and when the difference value between the second signal-to-noise ratio and the first signal-to-noise ratio is maximum, selecting a first group of parameters and a second group of parameters corresponding to the second signal-to-noise ratio with the maximum value as operation parameters.
The first signal-to-noise ratio is calculated in step 3 and represents the performance of the system in the presence of scattered noise. The second signal-to-noise ratio is calculated after iteratively adjusting the parameters in step 4, reflecting the performance of the system after parameter optimization. The principle of step 5 is to select the optimal combination of parameters by comparing the difference of the two signal to noise ratios. The main purpose of step 5 is to select the best combination from the series of parameter combinations generated in step 4. The optimal combination refers to a parameter setting that can maximize system performance in the presence of diffuse noise. Selecting the parameter combination with the largest difference between the second signal-to-noise ratio and the first signal-to-noise ratio ensures that the performance of the system in a scattered noise environment is improved to the greatest extent. This helps to reduce the influence of scattering noise and improve the performance and reliability of the optical system.
Example 2: the wavefront propagation equation constructed in step 1 is expressed using the following formula:
Wherein: Φ (r) is a wavefront function, representing the phase of the light wave at location r; phi 0 (r) is the initial wavefront phase; k is the wave number; r' and r "are the location of the source and the location of the point in the medium; dA is the area element on the source face; χ (r ") is the nonlinear polarization of the r" position in the medium.
Specifically, Φ (r) in the formula represents the phase distribution of the light waves in the liquid-cooled light module. By adjusting phi (r), precise control over the phase of the light wave can be achieved. This is important in scattering noise suppression because the scattering source causes disturbances in the phase of the light wave, and by adjusting the phase, disturbances caused by the scattering source can be partially or completely suppressed. Nonlinear effect terms in the formulaNonlinear effects that may be present in a liquid cooled optical module are taken into account, where χ (r ") represents the nonlinear polarization. This nonlinear effect can be used to correct and compensate for wavefront distortion caused by scattered noise, thereby improving the performance of the optical system. />, in the formulaThe influence of the light source and the propagation of the wave are taken into account, which is a key factor in the scattering noise suppression. The source and effect of scattering noise can be better understood and suppressed by modeling and modeling the distribution of sources and the propagation path of the waves. Various parameters in the formula can be adjusted and optimized according to actual conditions so as to inhibit scattering noise to the greatest extent. This includes adjusting the phase control, the intensity of the nonlinear effects, and the parameters of the wave front propagation model to optimize system performance. The process of selecting the optimal parameters of step 5 may involve a number of terms in the formula. This formula plays a critical role in optical scattering noise suppression in the liquid-cooled light module, and allows the scattering noise to be understood and suppressed by means of phase control, nonlinear effect consideration, source influence modeling, parameter optimization and the like, thereby improving the performance and stability of the optical system. These factors combine to enable the liquid-cooled module to better adapt to different operating conditions and environments and achieve significant achievements in terms of diffuse noise suppression. The core of the formula is the wave front propagation equation, denoted by Φ (r), which describes the phase of the light wave at different positions r. Wavefront propagation equations are important mathematical tools in optics, which are based on Huygens-Fresnel principles or wave equations, etc., and take into account propagation characteristics of light waves, including refraction, diffraction, interference, etc. In the liquid-cooled module, this equation is used to model how light waves propagate in the system. Φ (r) in the formula represents the phase distribution of the light waves. By adjusting phi (r), precise control over the phase of the light wave can be achieved. This phase modulation is critical to suppressing the scattering noise. When the light wave is disturbed by the scattering source, phase modulation may be used to compensate for wavefront distortion caused by the scattering source, thereby recovering the phase of the original light wave. Third term in the formula/>Nonlinear effects in the medium are taken into account. This means that the medium in the liquid-cooled light module may have non-linear polarization properties, which causes non-linear changes in phase and amplitude when the light intensity is high. This term allows phase modulation and adjustment of the optical wave in a nonlinear medium to suppress scattering noise. />, in the formulaThe influence of the source and the propagation of the wave are taken into account, where dA is the area element on the source face. This term indicates how the distribution of the source affects the construction of the wavefront, as well as the propagation path of the light wave in the liquid cooled optical module. This is a key factor in the suppression of scattered noise, as the location and distribution of the source can affect the intensity and distribution of the scattered noise.
Example 3: in step 1, a nonlinear gradient operator is applied to the wavefront function using the following formula:
Wherein, Is the gradient of the wavefront function at position r, representing the phase gradient of the light wave; /(I)This is the gradient of the wavefront function at location r' to describe the phase change of the light wave; /(I)This term represents the second order gradient of the wavefront function at position r'; /(I)Representing the third order gradient of the wavefront function at position r' "; χ (r ') represents the nonlinear nature of the medium at position r'; χ (3) (r ' ") is the third order nonlinear polarization of the medium at position r '", representing the high order nonlinear properties of the medium at position r ' "; dV is the volume element in the medium; p is the color temperature of the liquid cold light module; l is the thermal conductivity of the liquid cold light module.
Specifically, in the formulaThe phase gradient of the wavefront function at different positions r is calculated. In an optical system, the light wave may be affected by a scattering source during propagation, resulting in a disturbance of the wavefront phase. By calculating the phase gradient, changes in the wavefront phase, in particular disturbances due to scattering noise, can be detected and quantified. />, in the formulaAnd/>Nonlinear effects are considered, which may cause nonlinear behavior of the light waves in the liquid-cooled light module, such as self-focusing or self-phase modulation. These nonlinear effects can often cause phase distortions in the light wave, and this formula is used to quantify the extent of these nonlinear effects. The formulas χ (r ') and χ (3) (r' ") describe the nonlinear properties of the medium at different positions. These properties are directly related to the nonlinear interactions of the light waves as they propagate in the medium. For optical scattering noise suppression in a liquid-cooled optical module, knowledge of the nonlinear nature of the medium can help predict and control the interaction between the light waves and the medium. The parameter P represents the color temperature of the liquid-cooled light module, i.e. the color temperature of the light source. In an optical system, color temperature management may be used to adjust the color characteristics of the light source to accommodate the needs of different applications. For scattering noise suppression, proper color temperature management can affect scattering characteristics between the light waves and the sample, reducing scattering noise. The parameter L represents the thermal conductivity of the liquid-cooled module, which describes the thermal conductivity in the liquid-cooled system. Adjustment of thermal conductivity can affect thermal stability and temperature management of the system, which is important for scattered noise suppression. By adjusting the thermal conductivity, the temperature distribution in the liquid cooling system can be controlled, thereby affecting the performance of the optical element. In a liquid-cooled module, the application of this formula can help understand and control the propagation and phase modulation of the light waves in the system to minimize the effects of scattering noise. By calculating the phase gradient, taking into account nonlinear effects and knowing the properties of the medium, the design and operation of the liquid-cooled light module can be optimized, thereby improving the performance of the system, reducing the scattering noise, and obtaining higher quality optical imaging or measurement results. Meanwhile, by managing the color temperature and the thermal conductivity, the stability and the reliability of the system can be further optimized.
The wavefront function is a function describing the phase distribution of the light wave and is typically used in optical systems. In the liquid-cooled optical module, Φ (r) represents phase information of the optical wave at the position r, that is, phase distribution of the optical wave. This phase information is very important because it determines how the light waves propagate and interact in the system. In the formulaRepresenting the gradient of the wavefront function at position r, i.e. the spatial rate of change of phase. It tells us how the phase of the light wave changes with the change of position, providing information about the local behavior of the light wave. In the liquid-cooled light module, the disturbance of the light wave, including scattering noise, can be detected and quantified by calculating the phase gradient. The nonlinear gradient operator in the formula includes a plurality of terms, most importantly andRelated items. These terms are used to account for nonlinear effects that may be present in the optical system. Nonlinear effects are typically associated with high light intensities or nonlinear media, such as self-focusing, self-phase modulation, and the like. />, in the formulaAndThe second and third order gradients of the wavefront function are represented. These terms are used to describe the high order nonlinear effects of the light wave that may cause phase distortions or changes in the shape of the light wave in the liquid cooled light module. The χ (r ') and χ (3) (r') in the formula represent the nonlinear properties of the medium at different locations, including nonlinear polarizability and higher order nonlinear polarizability, respectively. These properties describe the nonlinear response of the medium to the light wave, i.e. how the medium changes its optical properties with changes in light intensity. The principle of this formula relates to various aspects of the phase information, phase gradient, nonlinear effects and nonlinear properties of the medium of the wavefront function. In a liquid-cooled light module, the application of this formula can help understand and control the behavior of the light wave in the system, especially in terms of optical scattering noise suppression. By calculating the phase gradient and considering the nonlinear effect, the design of the liquid luminescence module can be optimized, the influence of scattering noise is reduced, and the performance and stability of the system are improved. Meanwhile, understanding the nonlinear properties of the medium is helpful for predicting and regulating nonlinear optical effects, and further optimizing the performance of the optical system.
Example 4: finding the gradient of the wavefront function at position rThe maximum value point or the minimum value point of the scattering source is set as the position X of the scattering source.
In particular, scattering sources in the optical system can cause phase distortions of the light waves, affecting the quality of the imaging or measurement. By finding the extreme points of the gradient, the location of the scattering source can be determined, which is critical for identifying and locating the scattering source. For example, if a scattering source is present in the sample in the liquid-cooled module, this process may help pinpoint the location of the scattering source. The maxima points generally correspond to the locations of the scattering sources, while the minima points generally correspond to the extinction points of the scattering sources. By analyzing these points, the intensity of the scattering source can be estimated. This is important to understand the brightness or intensity distribution of the scattering source and helps to better understand the source and nature of the scattering noise. Finding the extreme points not only provides positional information of the scattering source, but also reveals the effect of the scattering source on the wavefront of the light wave. The maxima and minima represent the points of maximum and minimum change in the wavefront, which points are typically related to the presence or location of the scattering source. This helps to quantify the extent to which scattering noise affects the wavefront. Once the location and characteristics of the scattering source are determined, measures may be taken to reduce or correct for its effects. For example, a corresponding compensation element or algorithm may be introduced into the system to counteract phase distortions caused by the scattering source, thereby improving image quality or measurement accuracy. This correction procedure is used in liquid cooled optical modules for noise suppression by scattering, helping to obtain more accurate optical imaging or measurement results.
Example 5: in step 2, based on the wavefront function, a nonlinear transfer function of the light wave is constructed using the following formula:
wherein H (r) is a nonlinear transfer function; the color temperature P of the liquid-cooled light module and the thermal conductivity L of the liquid-cooled light module together form a first set of parameters of the nonlinear transfer function.
Specifically, the first term in the formulaIs responsible for transmitting the phase information of the light waves. Φ (r) represents the phase of the light wave at location r, while Φ 0 (r) represents the initial wavefront phase. This part acts in the liquid-cooled light module for maintaining the phase characteristics of the light waves, which is particularly important in terms of phase modulation and phase control. The phase information is critical to suppressing optical scattering noise because it can be used to correct for scattering-induced phase distortions, thereby improving the quality of the imaging or measurement. Second term in the formula/>Non-linear effects that may be present are described. This part includes the nonlinear polarizability χ (r') of the medium and the quadratic phase modulation/>, of the wavefront functionNonlinear effects are typically associated with high light intensities or nonlinear media, and may cause nonlinear behavior of the light waves, such as self-focusing or self-phase modulation. In a liquid-cooled light module, this formula is used to quantify the effect of nonlinear effects in order to better understand and control the behavior of the light waves. The parameters P and L in the formula together constitute a first set of parameters of the nonlinear transfer function. These parameters represent the characteristics of the liquid-cooled light module, including color temperature and thermal conductivity. By adjusting these parameters, the optical characteristics can be flexibly managed in the liquid-cooled optical module to meet the requirements of different applications. For example, the color characteristics of the light source may be changed by adjusting the color temperature, or the thermal stability of the system may be controlled by adjusting the thermal conductivity. This flexibility in parameter adjustment helps to optimize performance of the liquid-cooled module, including optical scattering noise suppression. In combination with optical scattering noise suppression in the liquid-cooled optical module, the function of this formula is to take into account both phase information and nonlinear effects. The transmission of phase information and phase modulation may be used to correct phase distortions caused by the scattering source, thereby reducing the effects of scattering noise. At the same time, modeling and parameter adjustment of nonlinear effects can help understand the mechanism of nonlinear scattering noise, thereby better suppressing and managing such noise.
Specifically, the first term in the formulaThe method is mainly used for transmitting the phase information of the light waves. Where Φ (r) represents the phase of the light wave at location r, and Φ 0 (r) is the initial wavefront phase. The product of these two phases represents the phase evolution of the light wave during transmission, which is critical for phase management and control in the liquid-cooled light module. By propagating the phase information, the phase characteristics of the light wave can be maintained, contributing to a reduction in phase distortion caused by scattering noise. The second term in the formula relates to nonlinear effects. This part includes the parameters P and χ (r'), and the quadratic phase modulation/>, of the wavefront functionSpecifically: p represents the color temperature of the liquid-cooled light module, and this parameter can be used to describe the color characteristics of the light source. The change in color temperature may affect the nonlinear response of the light waves. χ (r ") is the nonlinear polarization of the medium at location r", describing the nonlinear response of the medium to light waves. This nonlinear response is typically related to light intensity and may lead to nonlinear effects such as photon pair interactions. The parameter L represents the thermal conductivity of the liquid-cooled module, which describes the thermal conductivity in the liquid-cooled system. The value of thermal conductivity L may affect the phase modulation of the wavefront function. This term takes into account the heat conduction effect during propagation of the light wave, since the temperature distribution may affect the refractive index and the phase distribution. The right hand term of the formula is used to construct the nonlinear transfer function H (r). This function is the complex amplitude of the light wave at position r, including phase information and non-linear effect considerations. Nonlinear transfer functions are used to describe the transfer behavior of light waves in a liquid-cooled optical module, including phase modulation and nonlinear effects. In a liquid-cooled light module, the application of this formula is related to optical scattering noise suppression. The transmission of phase information helps correct phase distortions caused by the scattering source, thereby improving the quality of the imaging or measurement. At the same time, consideration of nonlinear effects allows the system to better understand and control the nonlinear behavior of the light waves to optimize the performance of the liquid-cooled module, especially in high light intensity or nonlinear medium applications.
Example 6: in step 2, the intensity distribution of the nonlinear scattered light is calculated using the following formula:
Wherein I (r) is the intensity distribution at position r; lambda is the wavelength of the light wave; z is the distance from the position r to the liquid cold light module; r is the beam diameter; r is the radial distance from the liquid light source at the position r; alpha is the absorption coefficient; θ is the beam polarization angle at position r.
Specifically, the main function of this formula is to calculate the light intensity distribution of the light wave at different positions r in the liquid-cooled light module. I (r) represents the intensity of the optical wave, i.e. the number of photons per unit area. It is an important parameter in optical systems for describing the intensity distribution of light waves. R in the formula represents the radial distance from the liquid light source at position R, and R represents the diameter of the light beam. These parameters are used to take into account the shape of the beam and the propagation distance of the light wave in the liquid-cooled optical module. λ in the formula represents the wavelength of the light wave, and θ represents the polarization angle of the light beam at position r. The wavelength determines the frequency and color characteristics of the light wave, while the polarization angle describes the polarization state of the light wave, both of which affect the characteristics of the light intensity distribution. The absorption coefficient α is used to describe the absorption of the light wave in the liquid-cooled light module. It is part of the optical material properties and is generally related to the intensity decay of the light wave during propagation. This factor plays an important role in the intensity distribution of the light wave. |h (r) | 2 in the formula represents the square of the modulus of the nonlinear transfer function H (r). This term takes into account the effect of the nonlinear effects on the light intensity distribution. The nonlinear transfer function describes the nonlinear transfer characteristics of light waves, such as self-focusing and self-phase modulation. Last itemNonlinear scattering effects are considered, where χ (r ") represents the nonlinear polarization in the medium. This term describes the effect of the nonlinear scattering effect of light waves in a medium on the light intensity distribution. In liquid cooled optical modules, optical scattering noise is a common problem that can cause degradation in the quality of the image or measurement. This formula combines various factors such as absorption, nonlinear transmission, and nonlinear scattering to calculate the light intensity distribution. By taking these factors into account in detail, the design and operation of the liquid-cooled light module may be optimized to suppress scattering noise and improve the quality of the imaging or measurement.
Example 7: in step 3, a first signal-to-noise ratio SNR (r) is calculated by the following formula:
wherein ||r-x|| represents the distance between the calculated position r and the position X; σ (r) is the background noise intensity at position r.
Specifically, the core of this formula is to calculate the first signal-to-noise ratio SNR (r) at position r, which is the ratio between the signal and the background noise. In a liquid cooled optical module, the signal may be the signal of interest in optical imaging, while the background noise includes noise caused by optical scattering. This signal-to-noise ratio is used to evaluate the sharpness and detectability of the signal. The r-X in the formula takes into account the distance between the signal source (typically the light source) and the observation position r. In liquid-cooled light modules, the distance is very important for the signal intensity, since the intensity of light decreases with increasing distance. This term helps to determine the relative strength of the signal when considering the distance between the source location and the observation location. σ (r) in the formula represents the background noise intensity at position r. In liquid cooled optical modules, optical scattering typically introduces background noise, which can interfere with the detection and measurement of the signal of interest. By considering the intensity of the background noise, the degree of influence of the noise can be evaluated. The second term in the equation relates to optical scattering suppression. This term includes the average value of χ 2 (r') and the square of σ (r). Nonlinear scattering is a source of optical scattering noise that may lead to an increase in background noise. The existence of this term reminds us to take measures to suppress nonlinear scattering when designing and operating the liquid-cooled light module to reduce background noise. The effect of this formula is to evaluate the relative intensity relationship between the signal and the optical scattering noise. By calculating the signal-to-noise ratio SNR (r), it can be determined whether the signal can be reliably detected and measured. If the signal-to-noise ratio is low, meaning that the noise is relatively strong, further optical scattering noise suppression measures may be required. Thus, this formula helps to guide optimization of the liquid-cooled light module, improve signal quality, reduce the effects of scattering noise, and thus achieve clearer and reliable results in optical imaging and measurement applications.
Example 8: in the step 3, nonlinear phase correction is performed on the optical wave according to the following formula:
Wherein, The value range is 0.3 to 0.5 for the first correction coefficient; beta is a second correction coefficient, and the value range is 1.1 to 1.6; h' (r) is a transfer function after nonlinear phase correction; first correction coefficient/>And the second correction factor beta together form a second set of parameters.
Specifically, H' (r) in the formula represents a transfer function after nonlinear phase correction. This nonlinear phase correction is an optical processing technique that improves the sharpness of the signal by adjusting the phase distribution of the light waves. In a liquid-cooled module, one of the key objectives of this correction is to suppress phase disturbances caused by optically scattered noise. In the formulaAnd β are two key correction coefficients that control the intensity and nonlinear characteristics of the phase correction. /(I)The first order effect of the phase correction is controlled, while beta controls the second order effect of the phase correction. In a liquid-cooled light module, the selection of these coefficients affects the degree of correction and can be adjusted according to the system performance requirements. Higher/>And beta values generally represent stronger phase corrections. The phase correction in the equation is achieved by multiplying the transfer function H (r) with a series of complex exponential terms. These complex exponential terms includeAnd/>Is a gradient of (a). Phase correction alters the phase distribution of the light wave by adjusting the phase of these complex exponential terms. In a liquid-cooled module, this correction can be used to counteract phase disturbances caused by optically scattered noise. One of the main objectives of this formula is to suppress optically diffuse noise in the liquid-cooled light module. Optical scattering noise is caused by the interaction of light waves with small inhomogeneities in the medium, which can cause phase disturbances and degradation of the signal. By nonlinear phase correction, such noise can be counteracted to some extent, making the signal easier to detect and analyze. The end effect of the formula is to improve the quality of the signal. By suppressing phase disturbance caused by scattered noise, the optical system can obtain a clearer and more stable signal. This is critical for imaging, measurement and data acquisition applications in the liquid-cooled modules, as they require high quality signals to obtain accurate results.
Example 9: in step 3, the intensity distribution of the new nonlinear scattered light is calculated using the following formula:
I′(r)＝|H′(r)|2；
where I' (r) is the intensity distribution of the new nonlinear scattered light.
Specifically, I' (r) in the formula is used to calculate the intensity distribution of the nonlinear scattered light at the position r. This is achieved by squaring the modulus of the modified transfer function H '(r), i.e., |h' (r) | 2. This intensity distribution tells us the light intensity distribution at different locations. One of the main functions of the formula is to increase the intensity of the signal and suppress the optical scattering noise. The introduction of nonlinear phase correction can reduce phase disturbances caused by optical scattering, and thus the calculated I' (r) represents a clearer and more stable signal distribution. This is very important for imaging, measurement and data acquisition applications, as they require high quality signals to obtain accurate results. By calculating the intensity distribution of the nonlinear scattered light, we can better understand the signal quality in the liquid-cooled light module. This helps to optimize the performance of the system to accommodate different application requirements. The modified signal strength profile may be used for further data processing and analysis. This formula is part of the method of suppressing optical scattering noise in a liquid-cooled light module. By calculating the intensity distribution of the nonlinear scattered light, the module can more efficiently process and optimize the optical signal, thereby improving the performance and reliability of the system. I' (r) reflects the effect of the nonlinear phase correction. A higher I' (r) value indicates that the phase correction successfully improves the signal quality and reduces the effect of scattering noise.
Example 10: the second signal-to-noise ratio SNR' (r) is calculated using the following formula:
Specifically, SNR' (r) in the equation is used to evaluate the signal quality at location r. It is the ratio between the signal and the noise, which is used to determine the strength of the signal relative to the level of noise. In optical systems, a high signal-to-noise ratio generally represents a clearer and reliable signal. I' (r) in the formula represents the signal intensity distribution at position r, which is the intensity after nonlinear phase correction. By calculating I' (r), we can know the distribution of the signal at different locations, and thus determine which locations are stronger. σ (r) in the formula represents the background noise intensity at position r. It is a key attribute of noise that can be used to account for noise levels. r-X represents the distance between position r and scattering source position X, which reflects the position of the signal. One of the main purposes of this formula is to evaluate the effect of the optical scattering noise suppression method. By comparing I' (r) with σ (r), we can determine the strength of the signal relative to noise. A higher SNR' (r) value indicates better noise suppression and easier signal detection. The calculation result of the formula reflects the optimization condition of the system performance. By maximizing SNR' (r), the liquid cooled optical module can adjust nonlinear phase correction parameters, etc., to optimize the system to accommodate different application requirements. The role of this formula is critical for imaging, measurement and data acquisition applications. Signal quality at high signal-to-noise ratios generally results in more accurate and clear imaging, as well as more reliable measurements. The function of this formula is to evaluate the improvement of signal quality and the suppression effect of optical scattering noise in the liquid-cooled optical module. By calculating the second signal-to-noise ratio SNR' (r), the module can quantify the balance between signal and noise, thereby optimizing system performance and improving signal quality and reliability.
While specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that these specific embodiments are by way of example only, and that various omissions, substitutions, and changes in the form and details of the methods and systems described above may be made by those skilled in the art without departing from the spirit and scope of the invention. For example, it is within the scope of the present invention to combine the above-described method steps to perform substantially the same function in substantially the same way to achieve substantially the same result. Accordingly, the scope of the invention is limited only by the following claims.
Claims (5)
1. A method of suppressing optical scattering noise in a liquid-cooled light module, the method comprising:
step 1: constructing a wave front propagation equation of light waves transmitted in the liquid cooling optical module, obtaining a wave front function of the light waves, and applying a nonlinear gradient operator to the wave front function to determine the position of a scattering source;
Step 2: based on the wavefront function, constructing a nonlinear transfer function of the light wave, and based on the nonlinear transfer function, calculating the intensity distribution of nonlinear scattered light;
step 3: calculating a first signal-to-noise ratio; performing nonlinear phase correction on the light wave to remove the influence of a scattering source, and calculating the intensity distribution of new nonlinear scattered light;
Step 4: calculating a second signal-to-noise ratio; the following procedure is iterated for a specified number of times: returning to the step 2, adjusting the first group of parameters of the nonlinear transfer function constructed in the step 2 and adjusting the second group of parameters of the nonlinear phase correction of the optical wave in the step 3;
step 5: selecting a first group of parameters and a second group of parameters corresponding to the second signal-to-noise ratio with the largest value when the difference value between the second signal-to-noise ratio and the first signal-to-noise ratio is largest;
The wavefront propagation equation constructed in step 1 is expressed using the following formula:
wherein: Φ (r) is a wavefront function, representing the phase of the light wave at location r; phi 0 (r) is the initial wavefront phase; k is the wave number; r' and r "are the location of the source and the location of the point in the medium; dA is the area element on the source face; χ (r ") is the nonlinear polarization of the r" position in the medium;
In step 1, a nonlinear gradient operator is applied to the wavefront function using the following formula:
Wherein, Is the gradient of the wavefront function at position r, representing the phase gradient of the light wave; /(I)This is the gradient of the wavefront function at location r' to describe the phase change of the light wave; /(I)This term represents the second order gradient of the wavefront function at position r'; /(I)Representing the third order gradient of the wavefront function at position r' "; χ (r ') represents the nonlinear nature of the medium at position r'; χ (3) (r ' ") is the third order nonlinear polarization of the medium at position r '", representing the high order nonlinear properties of the medium at position r ' "; dV is the volume element in the medium; p is the color temperature of the liquid cold light module; l is the thermal conductivity of the liquid cold light module;
Finding the gradient of the wavefront function at position r The coordinates corresponding to the maximum value point or the minimum value point are used as the position X of the scattering source;
in step 2, based on the wavefront function, a nonlinear transfer function of the light wave is constructed using the following formula:
Wherein H (r) is a nonlinear transfer function; the color temperature P of the liquid cold light module and the heat conductivity L of the liquid cold light module form a first group of parameters of a nonlinear transfer function together;
in step 2, the intensity distribution of the nonlinear scattered light is calculated using the following formula:
Wherein I (r) is the intensity distribution at position r; lambda is the wavelength of the light wave; z is the distance from the position r to the liquid cold light module; r is the beam diameter; r is the radial distance from the liquid light source at the position r; alpha is the absorption coefficient; θ is the beam polarization angle at position r.
2. The method of suppressing optical scattering noise in a liquid crystal module as defined in claim 1, wherein in step3, the first signal-to-noise ratio SNR (r) is calculated by the following formula:
wherein ||r-x|| represents the distance between the calculated position r and the position X; σ (r) is the background noise intensity at position r.
3. The method of suppressing optical scattering noise in a liquid crystal module as defined in claim 2, wherein in step 3, nonlinear phase correction is performed on the optical wave by the following formula:
Wherein, The value range is 0.3 to 0.5 for the first correction coefficient; beta is a second correction coefficient, and the value range is 1.1 to 1.6; h' (r) is a transfer function after nonlinear phase correction; first correction coefficient/>And the second correction factor beta together form a second set of parameters.
4. The method of suppressing optical scattering noise in a liquid crystal display module as defined in claim 3, wherein in step 3, the intensity distribution of the new nonlinear scattered light is calculated using the following formula:
I′(r)＝|H′(r)|2；
where I' (r) is the intensity distribution of the new nonlinear scattered light.
5. The method of suppressing optical scattering noise in a liquid-cooled optical module of claim 4, wherein the second signal-to-noise ratio SNR' (r) is calculated using the formula:
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