CN214472576U - A probe-type transceiver integrated optical fiber dust concentration measurement device - Google Patents
A probe-type transceiver integrated optical fiber dust concentration measurement device Download PDFInfo
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- CN214472576U CN214472576U CN202022907881.9U CN202022907881U CN214472576U CN 214472576 U CN214472576 U CN 214472576U CN 202022907881 U CN202022907881 U CN 202022907881U CN 214472576 U CN214472576 U CN 214472576U
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Abstract
本实用新型提供一种探入式收发一体光纤粉尘浓度测量装置及方法，包括收发一体光纤测量探头和信号发生与处理控制模块，收发一体光纤测量探头部分通过光纤线缆与信号发生与处理控制部分连接。收发一体光纤测量探头包括Y型结构的探头光纤束和测量探头尖端，信号发生与处理控制模块包括激光器，激光驱动器，温度控制器，主控制器，显示器，雪崩式探测器，信号处理器和数据采集装置。通过探入式收发一体的光纤测量探头设计，能够使测量端探入到复杂受限空间内的特定测量区域，进行粉尘浓度的测量。这种全光纤光路的测量方式不仅满足了在狭窄空间内的工作条件，而且有效避免了激光器光源，探测器以及信号处理电路等在复杂特殊环境下的不稳定性。
The utility model provides a probe-type transceiver integrated optical fiber dust concentration measuring device and method, comprising a transceiver integrated optical fiber measurement probe and a signal generation and processing control module. connect. Transceiver and integrated optical fiber measurement probe includes Y-shaped structure of probe fiber bundle and measurement probe tip, signal generation and processing control module including laser, laser driver, temperature controller, main controller, display, avalanche detector, signal processor and data collection device. Through the design of the optical fiber measurement probe integrated with the probe-type transceiver, the measurement end can be probed into a specific measurement area in a complex and restricted space to measure the dust concentration. This all-fiber optical path measurement method not only satisfies the working conditions in a narrow space, but also effectively avoids the instability of laser light sources, detectors and signal processing circuits in complex and special environments.
Description
Technical Field
The utility model relates to a dust concentration detection technical field, concretely relates to visit integrative optic fibre dust concentration measurement device of formula receiving and dispatching.
Background
Measurement of flow parameters of gas-solid two-phase flows has been a difficult problem: on one hand, the measurement methods of various dust concentrations have limitations in principle, and certain errors exist in measurement results. On the other hand, dust particle flow parameter measurement is often accompanied by severe field conditions, and most measurement systems can obtain better measurement results under strict laboratory conditions, but the effect in field actual operation is not satisfactory. In order to verify the reliability of the dry powder fire extinguishing system in the power cabin of the transportation vehicles such as airplanes and the like, the concentration of fire extinguishing agent particles in a complex protected space needs to be detected in real time.
At present, various dust detection devices at home and abroad, such as LD-5C type microcomputer laser dust meters, ATM-2000 laser dust concentration meters, JFC-1 laser dust concentration meters and the like, are mainly used for detecting the concentration of particles in atmospheric environment and industrial places, and are difficult to realize real-time measurement of high-concentration dust in a complex restricted space under severe environment conditions. In a special environment of a protected complex limited space, such as the influence of factors such as high temperature, high humidity and vibration on electronic elements of the measuring device, the instability of a signal processing circuit is caused, the accuracy of a measuring result cannot be ensured, and the anti-interference capability is poor.
In the prior art, a patent "powder base agent measuring system" (CN 101858846 a) discloses a measuring system for a dry powder agent, wherein a dry powder agent sensor head of the measuring system is very likely to cause dust accumulation, block a measuring light path and influence a measuring result in the measurement of a high-concentration dust environment in a complex limited space. And the equipment control system is too complex, and the equipment is not beneficial to miniaturization and carrying. Patent "a reflection type optic fibre dust concentration measurement system" (CN 106769738A) provides a reflection type optic fibre dust concentration measurement device, including measuring part, light source part, directional coupling part, signal conversion part. (Liuhai Strong et al. fiber dust concentration measurement research based on two-optical-path differential measurement [ J ] applied optics, 2019,40(01): 167-. The optical measurement part is fixed, the laser adjustment end and the reflection end are fixedly connected through the connecting rod, the applicability is poor, and the high-concentration dust in a required specific area cannot be detected in real time in a complex limited space.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a visit integrative optic fibre dust concentration measurement device of formula receiving and dispatching and method through visiting the integrative optic fibre measuring probe design of formula receiving and dispatching, can make the measuring end visit the specific measurement area in the complicated confined space, carries out the detection of dust concentration. The measuring mode of the all-fiber optical path not only meets the working condition in a narrow space, but also effectively avoids the instability of a laser light source, a detector, a signal processing circuit and the like in a complex special environment, ensures the accuracy of the measuring result and has stronger anti-interference capability.
The technical scheme of the utility model is that: a probing type receiving and transmitting integrated optical fiber dust concentration measuring device comprises a receiving and transmitting integrated optical fiber measuring probe and a signal generating and processing control module, wherein the receiving and transmitting integrated optical fiber measuring probe is connected with the signal generating and processing control part through an optical fiber cable. The receiving and transmitting integrated optical fiber measuring probe comprises a Y-shaped probe optical fiber bundle and a measuring probe tip, and the signal generating and processing control module comprises a laser, a laser driver, a temperature controller, a main controller, a display, an avalanche type detector, a signal processor and a data acquisition device.
The Y-shaped probe optical fiber bundle is formed by converging a plurality of transmitting end light source optical fiber bundles and a plurality of receiving end detecting optical fiber bundles through an optical fiber coupler, the converging end of the Y-shaped probe optical fiber bundle is connected with the tip end of the probe in a nested manner, the tip end of the measuring probe is of a hollow cylindrical structure with a plurality of wall holes arranged in the circumferential direction, and dust accumulation in a high-concentration dust environment can be avoided through the through type measuring space. The rear end of the interior of the Y-shaped probe optical fiber bundle converging end is sequentially provided with a lens and a reflector.
And the output end of the main controller is connected with the input ends of the laser driver and the temperature controller. The output ends of the laser driver and the temperature controller are connected with the input end of the laser. The output end of the laser is connected with the light source optical fiber bundle at the transmitting end through an optical fiber jumper, the detection optical fiber bundle at the receiving end is connected with the input end of the avalanche detector through the optical fiber jumper, the output end of the avalanche detector is connected with the input end of the data acquisition card through a signal processor, and the data acquisition card is interactively connected with the main controller. And the input end of the display is connected with the output end of the main controller.
The probing type receiving and transmitting integrated optical fiber dust concentration measuring device adopts a laser light source which adopts visible light red light with the wavelength of 650 nm. When the device is used for detecting the dust environment with the concentration lower than a certain threshold value, the current value passing through the laser can be increased through the laser driver so as to increase the initial light intensity; when the device is used for detecting a dust environment with the concentration higher than a certain threshold value, the current value passing through the laser can be reduced by the laser driver so as to reduce the initial light intensity.
The probing type receiving and transmitting integrated optical fiber dust concentration measuring device is characterized in that the optimal number of the transmitting end light source optical fiber bundles and the optimal number of the receiving end detection optical fiber bundles is as follows: the number of light source optical fibers at the transmitting end is 1, and the number of detection optical fibers at the receiving end is 6. The geometric distribution of the transmitting end light source optical fiber bundle and the receiving end detection optical fiber bundle on the section of the converging end of the Y-shaped probe optical fiber bundle is in a uniform and regular shape, and the receiving end detection optical fiber bundles are uniformly distributed around the transmitting end light source optical fiber bundle.
The probe-in type receiving and transmitting integrated optical fiber dust concentration measuring device is characterized in that the tip of the measuring probe is made of light absorption materials, and frosting and blackening are carried out to reduce the influence of space stray light on a detection signal of a receiving end.
The probe-in type receiving and transmitting integrated optical fiber dust concentration measuring device is characterized in that the distance from the inner reflector at the tip of the measuring probe to the converging end of the optical fiber bundle of the Y-shaped probe is 0-5 cm.
The utility model has the advantages that:
(1) the utility model discloses only need during the detection install sensor measuring probe in the dust environment, need not other auxiliary assembly and measure the dust concentration in the environment, visit into the detection mode, can use under various specific conditions in a flexible way, avoided the influence to dusty air current flow field environment, through type survey space can avoid high concentration dust measurement in-process, the dust in the probe is piled up, has improved the degree of accuracy that detects and has improved the degree of accuracy that detects;
(2) the utility model adopts the structure of transmitting and receiving, which is easy to integrate and miniaturize, has low cost, is convenient for detecting in narrow space, and the optical fiber probe of transmitting and receiving is of full optical fiber structure, thus avoiding the interference of external environment and improving the signal-to-noise ratio of the measuring system;
(3) the utility model discloses a receiving and dispatching integrative fiber probe tip's volume can be optimized according to the concrete shape condition in complicated confined space. When the complex restricted space is too narrow, the design size of the tip of the measuring probe can be properly reduced, so that the measuring probe can be more reasonably arranged in the complex restricted space, and the change condition of the dust concentration of a measuring point can be accurately obtained;
(4) the utility model discloses a preparation material of receiving and dispatching integrative fiber probe fiber bundle can adopt high temperature resistance optic fibre, is applicable to under the complicated detection conditions of high temperature, consequently can use in vehicle power cabins such as aircraft, verifies its dry powder fire extinguishing systems's reliability, carries out real-time detection to the dry powder fire extinguishing agent particle concentration in complicated its protected space.
Drawings
FIG. 1 is a schematic structural diagram of a probing type integrated fiber dust concentration measuring device;
FIG. 2 is a schematic view of the internal structure of the tip of the integrated fiber measurement probe;
FIG. 3 is a front view of the tip of a transceiver-integrated fiber optic measurement probe;
FIG. 4 is a side view of the tip of a transceiver-integrated fiber optic measurement probe;
FIG. 5 is a perspective view of the tip of the integrated fiber optic measurement probe;
FIG. 6 is a cross-sectional view of the distribution of the optical fiber bundle at the receiving end of the detector;
FIG. 7 is a cross-sectional view of the distribution of the fiber bundle at the emitting end of the laser light source;
FIG. 8 is a cross-sectional view of the converging end distribution of the probe fiber bundle;
FIG. 9 is a diagram of an example of a measuring device assembly installed in a representative complex confined space;
fig. 10 is a flow chart of a method implemented by a measuring device installed in a representative complex confined space.
The meaning of the reference symbols in the figures: 1-receiving and transmitting integrated optical fiber measuring probe part, 2-signal generating and processing control part, 3-representative complex limited space, 4-dusty airflow, 11-Y type probe optical fiber bundle, 111-receiving end detecting optical fiber bundle, 112-transmitting end light source optical fiber bundle, 113-lens, 114-receiving end optical fiber core, 115-transmitting end optical fiber core, 116-optical fiber protective layer, 12-measuring probe tip, 121-probe measuring space, 122-reflector, 123-reflector mounting end cover, 124-probe tip shell, 13-optical fiber coupler, 21-laser, 22-laser driver, 23-temperature controller, 24-main controller, 25-display, 26-avalanche type detector, 27-signal processor, 28-data acquisition means.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As shown in fig. 1 to 10, a probing type integrated fiber dust concentration measuring device includes an integrated fiber measuring probe 1 and a signal generating and processing control part 2, wherein the integrated fiber measuring probe 1 includes a Y-type probe fiber bundle 11, a receiving end detecting fiber bundle 111, a transmitting end light source fiber bundle 112, a lens 113, a measuring probe tip 12, a reflector 122, and a fiber coupler 13. The signal generation and processing control section 2 includes a laser 21, a laser driver 22, a temperature controller 23, a main controller 24, a display 25, an avalanche photodetector 26, a signal processor 27, and a data acquisition device 28.
The Y-shaped probe optical fiber bundle 11 is formed by converging a plurality of receiving end detection optical fiber bundles 111 and a plurality of transmitting end light source optical fiber bundles 112 through an optical fiber coupler, and the converging end of the Y-shaped probe optical fiber bundle 11 is connected with the tip 12 of the measuring probe in a nested manner. The measuring probe tip 12 is a hollow cylindrical structure with a wall hole formed in the circumferential direction, is made of a light absorption material, and is subjected to frosting and blackening treatment. The front end of the converging end of the Y-shaped probe fiber bundle 11 is sequentially provided with a lens 113 and a reflector 122. The hollow cylindrical structure in the measuring probe tip 12, in the area between the lens 113 and the mirror 122, is the probe measuring space 121. The straight-through type measuring space can avoid the influence of dust accumulation in a high-concentration dust environment on a measuring result.
The placing mode of the inner reflecting mirror 122 of the measuring probe tip 12 to the converging end lens 113 of the Y-shaped probe optical fiber bundle 11 is limited along the central axis, and the collimation of the optical path is ensured. The distance between the reflector 122 and the converging end lens 113 of the Y-shaped probe optical fiber bundle 11 is 0-5 cm. Namely, the focal length from the inner reflector 122 of the measuring probe tip 12 to the converging end lens 113 of the Y-shaped probe optical fiber bundle 11 should be between 0 and 5 cm.
In order to improve the dust concentration measurement precision, for the measurement of dust environments with different concentrations, the optimal determining method of the distance between the tip lens of the required measuring probe and the reflector comprises the following steps:
a. for different properties of the measured dust particles and different measured concentration ranges, the expression of the relationship between the intensity of the transmitted light and the original intensity is as follows according to Lambert-beer's law: i ═ I0e-cLK。I0The laser signal is an unattenuated laser signal, I is an attenuated laser signal, c is a dust concentration, L is a dust thickness through which incident light passes, and K is an absorption-divergence coefficient. And determining the absorption divergence coefficient K of the measured powder.
b. The transmissivity obtained by collecting the laser attenuation signal by the data collecting system is usually most suitable for data processing between 0.2 and 0.8, and the influence of noise signals such as stray light on the measurement result is small, so that the measurement result is more accurate. In the dust concentration measurement range of c2-c1g/m3Then, the following relationship is obtained:
and
by solving the above equation, the measurement range of the dust concentration is c2-c1g/m3The optical path L of the transmitted light is within a reasonable range
Measuring the distance between the probe tip lens and the reflector as the optical path L of the transmitted light
The output of the main controller 24 is connected to the laser driver 22 and the input of the temperature controller 23. The laser driver 22 and temperature controller 23 outputs are connected to the laser inputs. The output end of the laser 21 is connected with the transmitting end light source optical fiber bundle 112 through an optical fiber jumper, the receiving end detection optical fiber bundle is connected with the input end of the avalanche detector 26 through an optical fiber jumper, the output end of the avalanche detector 26 is connected with the input end of the data acquisition device 28 through the signal processor 27, and the data acquisition device 28 is interactively connected with the main controller 24. The input of the display 25 is connected to the output of the main controller 24.
As shown in fig. 10, a working method of the probing type integrated optical fiber dust concentration measuring apparatus includes the following steps:
a. the measurement probe tip 12 is first secured by a jig and installed into the protected structure test equipment. The measurement probe tips 12 should be reasonably arranged in a complex confined space;
b. the main controller 24 sends out an instruction, drives the laser 21 through the laser driver 22, makes the laser 21 at a constant working temperature through the temperature controller 23, and performs constant light intensity control on the laser 21;
c. the stabilized laser signal emitted by the laser 21 enters the probe measuring space 121 through the transmitting end light source fiber bundle 112, is focused by the lens 113, and then irradiates the dust environment inside the probe measuring space 121 again through reflection of the reflecting mirror 122, so that the two-way optical path transmission of the laser signal in the dust environment inside the probe tip is realized;
d. laser signals emitted from dust to be detected in the probe measuring space 121 are focused by the lens 113 and then transmitted to the avalanche type detector 26 through the receiving end detection optical fiber bundle 111;
e. the avalanche type detector 26 converts the received laser signal into an electric signal and sends the electric signal to the signal processor 27, the signal processor 27 performs filtering and amplification processing, and concentration signal acquisition is performed at a certain acquisition frequency through the data acquisition device 28;
f. the main controller 24 processes the output electrical signal to obtain a ratio of the output signal to the original signal, establishes a relationship between the transmittance and the dust concentration according to the lambert-beer law, and finally obtains the dust concentration to display on the display 25 in real time.
The relationship between the transmittance and the dust concentration was obtained by the following calculation method. As shown in fig. 10, the measuring probe tip 12 installed in a typical complex confined space measures the dusty gas flow 4 by light, and calculates the ratio of the output signal to the original signal, i.e., the transmittance, based on the measurement data, and since the transmittance has a certain proportional relationship with the dust concentration in the dusty gas flow 4, the dust concentration in the dusty gas flow 4 can be calculated based on the certain proportional relationship. Initial light intensity of I0The monochromatic parallel light passes through a dust area with the medium thickness L, and if N scattering particles with the same size exist in a unit dust area, the light intensity I penetrating through the dust area is weakened under the scattering and absorption effects of the particles. According to lambert-beer's law, the reduced light intensity can be expressed as:
in the formula: n is a radical ofvNumber of particles per unit volume, KextThe extinction coefficient is related to the particle diameter d of the dust, the wavelength λ of incident light, and the refractive index m of the medium. L is the dust thickness through which the incident light passes. The particle number concentration is further deduced to be:
assuming that the measured particles are spherical particles, the density is ρ, and the diameter is d, the mass concentration is calculated as:
in practical application, the corresponding relation between the dust concentration and the transmissivity can be determined by a calibration test method, and the dust concentration can be conveniently obtained according to an experimental value in the measurement process.
The utility model discloses a theory of operation: the main controller 24 is the core of the whole measuring device, and drives the laser 21 through the laser driver 22 and the temperature controller 23, and makes it at a constant working temperature for constant light intensity control. The stabilized laser signal emitted by the laser 21 passes through the light source fiber bundle 112 at the emitting end, is focused by the lens 113, and then irradiates the dust environment inside the probe measuring space 121, and the laser is reflected by the reflecting mirror 122 and irradiates the dust environment inside the probe measuring space 121 again, so that the two-way optical path transmission of the laser signal in the dust environment inside the measuring probe tip 12 is realized, and the measuring optical path is increased. Finally, the attenuated laser is focused by the lens 113 and transmitted to the avalanche type detector 26 through the receiving end detection optical fiber bundle 111. The avalanche detector 26 converts the received laser signal into an electrical signal, and sends the electrical signal to the signal processor 27 for filtering and amplification, the data acquisition device 28 acquires a concentration signal at a certain acquisition frequency, the main controller 24 processes the output electrical signal to obtain the ratio of the output signal to the original signal, and according to the lambert-beer law, the relationship between the transmittance and the dust concentration is established, and finally the obtained dust concentration is displayed on the display 25 in real time. Finally, the dust concentration measurement function of the receiving and transmitting integrated type is realized.
The above combinations may be flexibly adapted to some specific situations:
when the dust concentration of the dusty airflow 4 in the complex confined space is low, the main controller 24 can adjust the laser driver 22 to increase the current value passing through the laser 21 so as to increase the initial light intensity; when the dust concentration of the dusty gas flow 4 in the complex confined space is high, the main controller 24 can adjust the laser driver 22 to reduce the current value passing through the laser 21 to reduce the initial light intensity. And finally determining the initial light intensity value according to the specific measurement environment.
The volume of the measurement probe tip 12 can be optimized for the particular situation of a complex confined space. When the complex confined space is too narrow, the measurement probe tip 12 may be appropriately sized to be reduced for more reasonable placement in the complex confined space. When the environmental temperature in the complex confined space is too high, the measuring probe tip 12 and the Y-type probe fiber bundle 11 can be subjected to appropriate high temperature resistant protection treatment. And finally determining the reasonable design of the tip shape and the protective measures of the measuring probe according to the specific measuring environment.
The utility model discloses an integrative measuring function of receiving and dispatching is realized to the optic fibre structure of receiving and dispatching integrative optical fiber measuring probe 1 adoption Y type probe fiber bundle 11, measuring probe pointed end 12 and optic fibre wire jumper. Through the collection of the transmitted light signal by the avalanche detector 26, the relation between the light transmittance and the dust concentration is established according to the Lambert-beer law, and the real-time measurement of the dust concentration in the complex limited space is realized. The utility model discloses only need when measuring dust concentration during to receive and dispatch integrative fiber measurement probe 1 install dust environment, need not to gather the dust in the environment with the help of other auxiliary assembly, simple structure, easily miniaturization and low cost, the measuring method of probing formula has avoided measuring region wall to the influence of scattering region's size and relative position, and direct type measurement space can avoid among the high concentration dust measurement process, and dust in the probe is piled up, has improved the degree of accuracy that detects. The receiving and transmitting integrated structure is easy to integrate and miniaturize and has low cost, not only meets the working condition in a narrow space, but also effectively avoids the instability of circuit components in a complex special environment, ensures the accuracy of the measuring result and has stronger anti-jamming capability. The technical support is provided for anti-interference dust concentration measuring equipment in a complex limited space.
The above-mentioned embodiments are only to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112557269A (en) * | 2020-12-07 | 2021-03-26 | 中国科学技术大学 | Probing type receiving and transmitting integrated optical fiber dust concentration measuring device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112557269A (en) * | 2020-12-07 | 2021-03-26 | 中国科学技术大学 | Probing type receiving and transmitting integrated optical fiber dust concentration measuring device and method |
| CN112557269B (en) * | 2020-12-07 | 2024-11-19 | 中国科学技术大学 | Detection type receiving and transmitting integrated optical fiber dust concentration measuring device and method |
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