CN102706541A - System for detecting comprehensive performance of laser radiator based on virtual instrument - Google Patents

Abstract

The invention provides a comprehensive performance detection system of a laser radiator based on a virtual instrument, which can measure main performance indexes reflecting the quality of the laser radiator. Including synchronization unit, attenuation unit, optical axis stability and deflection angle test unit, time amount test unit, energy test unit, power supply unit, beam performance test unit, laser radiator components and measurement and control computer; the synchronization unit provides the control of the entire test system The time reference, the attenuation unit completes the matching of the input light energy and the dynamic range of the detector, the optical axis stability and deflection angle test unit measures the optical axis stability and optical axis deviation of the multiple laser emissions of the radiator through the CCD, and the time measurement unit completes The coding accuracy and pulse waveform test, the energy test unit completes the measurement of laser radiation energy, the beam performance test unit completes various tests of the laser beam performance, and the power supply unit provides power for the laser radiator and the test computer.

Description

Comprehensive Performance Testing System of Laser Radiator Based on Virtual Instrument

technical field

The invention belongs to the technical field of laser radiator detection, and relates to a comprehensive performance detection system of a laser radiator based on a virtual instrument.

Background technique

Due to the unique optical properties of the laser radiator, it has important application value in the field of national defense and military, such as laser ranging, irradiation, laser guidance, laser radar, etc. The application of laser is inseparable from the device that produces laser - laser radiator. The main performance indicators that measure the pros and cons of lasers, such as energy, power, and beam quality, are critical to their applications. Therefore, it is necessary to accurately measure and analyze the main performance indicators of the laser.

In practical applications, what is concerned is how much energy is focused to a certain range of the focal plane, or how much energy can be transmitted to a certain distance or within a spatial range. For example, the maximum ranging capability of a laser range finder depends on the laser power density transmitted to the target. The power density on the target is not only related to the output power of the laser, but also depends to a large extent on the beam quality of the laser beam. Under the condition of the same laser emission power, the better the beam quality, the more concentrated the beam at the target, the greater the laser power density, and the stronger the ranging capability of the rangefinder; otherwise, the worse it is. Therefore, in the actual production of laser products, it is necessary to quickly and accurately measure the main performance indicators of the laser radiator to detect whether the laser device meets the design and application requirements.

Contents of the invention

The purpose of the present invention is to provide a comprehensive performance detection system for laser radiators based on virtual instruments, which can measure the main performance indicators reflecting the quality of laser radiators, such as energy, power, beam quality, optical axis stability and deviation, etc.

The comprehensive performance detection system of laser radiator based on virtual instrument includes synchronization unit, attenuation unit, optical axis stability and deflection angle test unit, time measurement unit, energy test unit, power supply unit, beam performance test unit, laser radiator Components and a measurement and control computer; wherein the power supply unit is connected to the measurement and control computer and the laser radiator component respectively, the output of the laser radiator component is connected to the input of the synchronization unit, the output of the synchronization unit is connected to the input of the attenuation unit, and the output of the attenuation unit is respectively connected to the optical Input connections for the axis stability and deflection test unit, the amount of time test unit, the energy test unit, the beam performance test unit, the optical axis stability and deflection test unit, the amount of time test unit, the energy test unit, the beam performance test unit The output is connected to the measurement and control computer; the synchronization unit provides the time reference of the entire test system, the attenuation unit completes the matching of the input light energy and the dynamic range of the detector, and the optical axis stability and deflection angle test unit measures the multiple laser emissions of the radiator through the CCD The optical axis stability and optical axis deviation, the time measurement unit completes the test of coding accuracy and pulse waveform, the energy test unit completes the measurement of laser radiation energy, the beam performance test unit completes various tests of laser beam performance, and the power supply unit provides laser radiator and test computer power.

The above units are arranged on the shockproof reference platform.

Beneficial effects of the present invention:

1. Standard interface platform: Provide a unified test software standard interface and connection platform, and use LabVIEW software dedicated to the field of measurement and control for development.

2. High flexibility: It can accommodate any ATE system configuration, and can quickly replace fixtures or measured objects.

3. High reliability: the test system can be plugged and unplugged thousands of times.

4. High integration: several or even hundreds of test equipment can be integrated in the same test system.

5. High degree of synchronization: use the synchronous trigger clock of the PXI chassis backplane to strictly carry out synchronous, simultaneous and real-time online testing in the test system.

6. The lowest overall cost of use: within the service life of the test system, the lowest connection cost is provided.

Description of drawings

Fig. 1 is a block diagram of the hardware composition of the laser radiator comprehensive performance detection system based on the virtual instrument of the present invention;

2 is a schematic diagram of the module composition of the laser radiator comprehensive performance detection system based on virtual instruments in the present invention;

Fig. 3 is the optical path diagram of laser radiator optical axis stability and deflection angle measurement;

Figure 4 is a hierarchical diagram of the hardware structure based on virtual instruments.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods are provided And specific operation process, but protection scope of the present invention is not limited to following embodiment.

The whole system of the present invention is designed according to modularization, and each has independent functions, so as to facilitate the installation, debugging, maintenance and expansion of the system.

The optical path diagram for the measurement of the optical axis stability of the radiator in the optical axis stability and deflection angle test unit is shown in Figure 3, and the measurement is completed by the CCD imaging system. The unit consists of a collimating objective lens, a CCD receiving system, etc., and is installed on a precision adjustment base. Measure the position of the spot center of the laser emitter multiple times on the CCD target surface, and calculate the deviations Δx and Δy of multiple positions. According to the focal length f' of the lens, the angular deviation Δθ x and Δθ _x of the optical axis stability can be calculated. _Δθy :

${\mathrm{<span\; class="notranslate">\; \&Delta;\&theta;</span>}}_{\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&Delta;x</span>}}{{\mathrm{<span\; class="notranslate">\; f</span>}}^{<span\; class="notranslate">\; \&prime;</span>}}$ ${\mathrm{<span\; class="notranslate">\; \&Delta;\&theta;</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&Delta;y</span>}}{{\mathrm{<span\; class="notranslate">\; f</span>}}^{<span\; class="notranslate">\; \&prime;</span>}}$ $\mathrm{<span\; class="notranslate">\; \&Delta;\&theta;</span>}<span\; class="notranslate">\; =</span>\sqrt{\frac{{\mathrm{<span\; class="notranslate">\; \&Delta;x</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&Delta;y</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{{\mathrm{<span\; class="notranslate">\; f</span>}}^{<span\; class="notranslate">\; \&prime;</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

According to the definition of the national standard, the optical axis should be the center of the densest spot. Therefore, the center of mass Δxi and _{Δy i of} the laser spot within a period of time are measured by using the centroid method. Then sort Δxi _and Δy _i from small to large and substitute them into the above formula to solve the stability of the laser emission optical axis.

For the declination measurement of the emission optical axis of the laser radiator and the installation reference plane, first measure and record the imaging position of the installation reference plane on the CCD focal plane, and then record the position of the laser spot on the CCD focal plane when the laser is emitted, and the emission optical axis can be calculated and the declination angle of the mounting reference plane. The CCD adopts the digital camera of AVT Company of Germany, and the video digital signal formed by it is collected through the IEEE1394 data card.

The energy test unit uses an energy meter with an electrically controlled aperture to measure the laser energy, and the attenuator selects a suitable attenuation ratio to make the maximum energy density and maximum power density within the allowable range of the probe. Adjust the appropriate range to correctly measure the laser energy. The energy meter is placed behind the high-speed response probe and the electronically controlled diaphragm, and measures the energy through the transmitted light of the spectroscopic system. The relative value measured here can be calibrated to obtain the absolute value of the laser output energy. GB/T15175-94-6.1 stipulates that the energy measurement is the average value of multiple measurements:

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; out</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&tau;</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; \&times;</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; no</span>}}\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; out</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

In the formula, Q _out laser output energy: Q _{out, i} measured energy for the ith time; τ _n the transmittance of the attenuation sheet; n the total number of measurements of the same input energy. As an independent unit module in the system, the energy meter has an independent test function, and can directly communicate with the computer through RS232 to read the measurement results.

The time measurement unit includes pulse waveform and encoding accuracy. The time measurement adopts fast response probe + oscilloscope + frequency meter, and is measured through the light leakage sampling of the reflector of the spectroscopic system. Use fast detectors (photodiodes) to convert optical pulse signals into electrical pulses: use broadband transmission lines (fast cables) to transmit electrical pulse signals to high-bandwidth oscilloscopes and frequency counters for data processing, real-time display and calculation The digital oscilloscope and frequency meter can directly communicate with the computer interface to facilitate the acquisition of measurement data.

The beam performance test unit uses the laser beam analysis test system to complete the measurement of the beam quality, such as: two-dimensional light intensity image, energy distribution uniformity, etc. The system's camera is well suited for spot mass analyzer systems and can be used for high-quality image recording.

As shown in Figure 4, the hardware platform of the virtual instrument consists of two parts, the computer and the interface module. According to the difference of the interface bus, according to the actual configuration of the system, the interface module of the virtual instrument can be divided into RS232 interface module and IEEE1394 interface module. The interface module mainly completes the acquisition, conditioning and analog-to-digital conversion of the measured signal. From the hardware structure of the virtual instrument, it can be seen that it takes the computer as the core, and supports a variety of interface devices on the basis of it, digital CCD (AVT Guppy camera), digital CCD (camera for beam quality analysis and measurement), waveform analysis instrument, energy meter, thus forming a comprehensive measurement system for laser performance and pulse encoding accuracy. From another point of view, this method based on virtual instruments has broken through the concept of a single instrument, and can fully realize the collaborative work of many different instruments.

Claims (4)

1. The comprehensive performance detection system of laser radiator based on virtual instrument is characterized in that: comprise synchronization unit, attenuation unit, optical axis stability and deflection angle test unit, time amount test unit, energy test unit, power supply unit, light beam performance test Unit, laser radiator assembly, and measurement and control computer; wherein the power supply unit is connected to the measurement and control computer and the laser radiator assembly, the output of the laser radiator assembly is connected to the input of the synchronization unit, the output of the synchronization unit is connected to the input of the attenuation unit, and the attenuation unit The output of the optical axis stability and deflection angle test unit, the time amount test unit, the energy test unit, the input of the beam performance test unit are connected respectively, the optical axis stability and deflection angle test unit, the time amount test unit, the energy test unit, The output of the beam performance test unit is connected to the measurement and control computer; the synchronization unit provides the time reference of the entire test system, the attenuation unit completes the matching of the input light energy and the dynamic range of the detector, and the optical axis stability and deflection angle test unit measures the radiation of the radiator through the CCD The optical axis stability and optical axis deviation of multiple laser emissions, the time measurement unit completes the test of coding accuracy and pulse waveform, the energy test unit completes the measurement of laser radiation energy, the beam performance test unit completes various tests of laser beam performance, and the power supply The unit provides power for the laser radiator and test computer. 2. the laser radiator comprehensive performance detection system based on virtual instrument as claimed in claim 1, is characterized in that: in optical axis stability and deflection angle test unit, radiator optical axis stability measurement is by collimating objective lens, CCD receiving system Composition, installed on the adjustment base; respectively measure the position of the spot center of the laser emitter multiple times on the CCD target surface, and calculate the deviation Δx and Δy of multiple positions, and calculate the light according to the focal length f' of the lens Angular deviation Δθ _x , Δθ _y for axial stability: ${\mathrm{<span\; class="notranslate">\; \&Delta;\&theta;</span>}}_{\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&Delta;x</span>}}{{\mathrm{<span\; class="notranslate">\; f</span>}}^{<span\; class="notranslate">\; \&prime;</span>}}$ ${\mathrm{<span\; class="notranslate">\; \&Delta;\&theta;</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&Delta;y</span>}}{{\mathrm{<span\; class="notranslate">\; f</span>}}^{<span\; class="notranslate">\; \&prime;</span>}}$ $\mathrm{<span\; class="notranslate">\; \&Delta;\&theta;</span>}<span\; class="notranslate">\; =</span>\sqrt{\frac{{\mathrm{<span\; class="notranslate">\; \&Delta;x</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&Delta;y</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{{\mathrm{<span\; class="notranslate">\; f</span>}}^{<span\; class="notranslate">\; \&prime;</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$ The optical axis is the center of the densest spot. Use the centroid method to measure the centroids Δxi _and Δy _i of the laser spot within a period of time, and then sort Δy _i and Δy _i from small to large and substitute them into the above formula to solve the stability of the laser emission optical axis . 3. the laser radiator comprehensive performance detection system based on virtual instrument as claimed in claim 1 or 2, it is characterized in that: the amount of time test unit comprises pulse waveform and coding accuracy test, adopts the form of fast response probe+oscilloscope+frequency meter , through the light leakage sampling of the mirror of the spectroscopic system for measurement, and the photodiode is used to convert the optical pulse signal into an electrical pulse: the electrical pulse signal is transmitted to a high-bandwidth oscilloscope and a frequency counter with a broadband transmission line, and the data is processed, and the pulse is displayed and calculated in real time Waveform, width, repetition frequency time amount, digital oscilloscope, frequency meter and measurement and control computer are connected for acquisition of measurement data. 4. The comprehensive performance detection system of laser radiator based on virtual instrument according to claim 1 or 2, characterized in that: the above-mentioned units are arranged on an anti-vibration reference platform.

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