CN102706541B - System for detecting comprehensive performance of laser radiator based on virtual instrument - Google Patents

Abstract

The invention provides a system for detecting comprehensive performance of a laser radiator based on a virtual instrument, which can measure main performance indexes capable of reflecting advantages and disadvantages of laser radiators. The system comprises a synchronization unit, an attenuation unit, an optical axis stability and deflection testing unit, a time quantum testing unit, an energy testing unit, a power supply unit, a light beam performance testing unit, a laser radiator component and a measurement and control computer, wherein the synchronization unit is used for providing time references for the whole testing system; the attenuation unit is used for matching input light energy with a dynamic range of a detector; the optical axis stability and deflection testing unit is used for measuring the optical axis stability and the optical axis deviation of the radiator after repeated laser emission through a charge coupled device (CCD); the time quantum testing unit is used for testing encoding accuracy and pulse shapes; the energy testing unit is used for measuring laser radiation energy; the light beam performance testing unit is used for finishing various tests of performance of laser beams; and the power supply unit is used for supplying power to a laser radiator and a test computer.

Description

Based on the laser irradiator comprehensive performance detecting system of virtual instrument

Technical field

The invention belongs to laser irradiator detection technique field, relate to a kind of laser irradiator comprehensive performance detecting system based on virtual instrument.

Background technology

Because the optical property of laser irradiator uniqueness has important using value in national defense and military fields, as laser ranging, irradiation, laser guidance, laser radar etc.The application of laser be unable to do without lasing device---laser irradiator.Weigh the main performance index of laser instrument quality, such as energy, power and beam quality etc., be vital to its application.Therefore, need measure accurately the main performance index of laser instrument and analyze.

In actual applications it is of concern that have how many Voice segment in the certain limit of focal plane, or there are how many energy can be transferred in a distance or spatial dimension.The maximum measure distance ability of such as range finder using laser is rich will depend on the laser power density be transferred on target, and in target, power density is not only relevant with the power that laser instrument exports, and depends on the beam quality of laser beam to a great extent.Under the condition that laser emitting power is identical, beam quality is better, and target place light beam is more concentrated, and laser power density is larger, and the range capability of range finder is stronger; Otherwise it is then poorer.So, in practical laser production, need main performance index that is quick, Measurement accuracy laser irradiator, whether reach design and devdlop requirement with detection laser device.

Summary of the invention

The object of this invention is to provide a kind of laser irradiator comprehensive performance detecting system based on virtual instrument, the main performance index of reflection laser radiation device quality can be measured, such as energy, power, beam quality, optical axis stable and deviation etc.

Based on the laser irradiator comprehensive performance detecting system of virtual instrument, lock unit, attenuation units, optical axis stable and deflection angle testing unit, time quantum test cell, energy test unit, power subsystem, light beam performance test unit, laser irradiator assembly and Measurement &control computer should be comprised; Wherein power subsystem is connected with Measurement &control computer, laser irradiator assembly respectively, the output of laser irradiator assembly is connected with the input of lock unit, the output of lock unit is connected with the input of attenuation units, the output of attenuation units is connected with the input of optical axis stable and deflection angle testing unit, time quantum test cell, energy test unit, light beam performance test unit respectively, and optical axis stable is connected with Measurement &control computer with the output of deflection angle testing unit, time quantum test cell, energy test unit, light beam performance test unit; Lock unit provides the time reference of whole test macro, attenuation units completes the coupling of input luminous energy and detector dynamic range, optical axis stable and deflection angle testing unit pass through optical axis stable and the optical axis deviation of the repeatedly Laser emission of CCD measuring radiation device, time quantum test cell completes the test of encoding precision and impulse waveform, energy test unit completes the measurement of laser emission energy, light beam performance test unit completes every test of laser beam performance, and power subsystem provides the power supply of laser irradiator and test computer.

Said units is arranged on shockproof reference platform.

Beneficial effect of the present invention:

1, standard interface platform: provide unified testing software standard interface and connecting platform, adopts the LabVIEW software being exclusively used in measurement and control area to develop.

2, high degree of flexibility: can hold any ATE system configuration, can change fixture or measurand fast.

3, height reliability: test macro can plug thousands of times.

4, high integration: can in same test macro integrated a few cover or even cover testing equipment up to a hundred.

5, high level of synchronization: utilize the synchronous shot clock of PXI case back plate strictly can carry out in test macro synchronous, simultaneously and real-time in-line testing.

6, minimum overall cost of use: within the service life of test macro, provides minimum connection charge.

Accompanying drawing explanation

Fig. 1 is the laser irradiator comprehensive performance detecting system hardware composition frame chart that the present invention is based on virtual instrument;

Fig. 2 is the laser irradiator comprehensive performance detecting system module composition schematic diagram that the present invention is based on virtual instrument;

Fig. 3 is laser irradiator optical axis stable and measurement of angle index path;

Fig. 4 is the hardware configuration hierarchy chart based on virtual instrument.

Detailed description of the invention

For making the object, technical solutions and advantages of the present invention clearly; below in conjunction with accompanying drawing, embodiments of the invention are elaborated: the present embodiment is implemented under premised on technical scheme of the present invention; give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.

Entire system of the present invention, by modularized design, has independently function, separately to facilitate the installation, debugging, maintenance, expansion etc. of system.

In optical axis stable and deflection angle testing unit, radiator optical axis stable optical path figure as indicated at 3, measures and completed by CCD imaging system.This unit is made up of collimator objective, CCD receiving system etc., is arranged on accurate adjustment pedestal.Measure the spot center of laser irradiator repeatedly Emission Lasers respectively in the position of CCD target surface, obtain departure Δ x, the Δ y of multiple position, according to the angular deviation Δ θ of the focal distance f of lens ' can obtain optical axis stable _x, Δ θ _y:

${\mathrm{\Δ\θ}}_x=\frac{\mathrm{\Δx}}{f^{\′}}$ ${\mathrm{\Δ\θ}}_y=\frac{\mathrm{\Δy}}{f^{\′}}$ $\mathrm{\Δ\θ}=\sqrt{\frac{{\mathrm{\Δx}}^2+{\mathrm{\Δy}}^2}{f^{\′}}}---\left(1\right)$

According to the definition of GB, optical axis should be the center that hot spot is the most intensive.Therefore centroid method is utilized to measure laser facula barycenter Δ x in a period of time _i, Δ y _i.Then by Δ x _i, Δ y _iascending sequence also substitutes into the stability that above formula can solve Laser emission optical axis.

Laser irradiator is launched to the measurement of angle of optical axis and datum clamp face, first measure and record the image space of datum clamp face at CCD focal plane, when then recording Emission Lasers, the position of laser facula on CCD focal plane, can calculate the drift angle of launching optical axis and datum clamp face.CCD adopts German AVT company digital camera, and the video signal that it is formed is gathered by IEEE1394 data card.

Energy test unit utilizes the automatically controlled diaphragm energy meter of band to measure laser energy, and suitable attenuation ratio chosen by attenuator, makes maximum energy-density and maximum power density in probe allowed band.Adjust suitable range and correctly measure laser energy.After energy meter is positioned over high-speed response probe and automatically controlled diaphragm, by the transmission light measurements energy of beam splitting system, by demarcating, the relative value measured here, show that laser instrument exports the absolute value of energy.In GB/T15175-94-6.1, predetermined energy measurement is the mean value of repetitive measurement:

$Q_{\mathrm{out}}=\frac{1}{{\mathrm{\τ}}_n}\×\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{Q}_{\mathrm{out},i}---\left(2\right)$

In formula, Q _outlaser instrument exports energy: Q _{out, i}measure energy i-th time; τ _nthe transmittance of attenuator; The measurement total degree of the same input energy of n.Energy meter is as an independently unit module in systems in which, possesses independently test function, can directly be communicated by RS232 with computer, reads measurement result.

Time quantum test cell comprises impulse waveform and encoding precision, and time measurement adopts and responds probe+oscillograph+frequency meter fast, is measured by the sampling of beam splitting system speculum light leak.Adopt fast detector (photodiode), convert light pulse signal to electric pulse: with wide-band transmission broadband transmission (quick cable) undistorted electric impulse signal is transported on high bandwidth oscilloscope and frequency meter, carry out data processing, real-time display also calculates impulse waveform, width, repetition rate equal time amount, digital oscilloscope and frequency meter can with computer-directed communications interface, be convenient to the acquisition of measurement data.

Light beam performance test unit utilizes laser beam analysis of test system to complete the measurement of beam quality, as: two-dimentional plot of light intensity picture, energy distribution of laser etc.The camera of this system is very suitable for optical quality analyzer system, and can be used for high-quality photologging.

As shown in Figure 4, the hardware platform of virtual instrument is made up of computer and interface module two parts.According to the difference of interface bus, according to the actual disposition situation of native system, the interface module of virtual instrument can be divided into RS232 interface module and IEEE1394 interface module.The collection mainly completing measured signal of interface module, conditioning and analog-to-digital conversion.From the hardware configuration of virtual instrument, can find out that it take computer as core, support multiple interfaces equipment on its basis, digital CCD (AVT Guppy video camera), digital CCD (camera for beam quality analysis is measured), waveform analyzer, energy meter, thus constitute laser activity and pulse code accuracy synthesis measuring system.From another angle, this mode based on virtual instrument has broken through the concept of single instrument, can realize the collaborative work of multiple different instrument completely.

Claims (3)

1. based on the laser irradiator comprehensive performance detecting system of virtual instrument, it is characterized in that: comprise lock unit, attenuation units, optical axis stable and deflection angle testing unit, time quantum test cell, energy test unit, power subsystem, light beam performance test unit, laser irradiator assembly and Measurement &control computer; PXI computer centered by described Measurement &control computer;

Wherein power subsystem is connected with Measurement &control computer, laser irradiator assembly respectively, the output of laser irradiator assembly is connected with the input of lock unit, the output of lock unit is connected with the input of attenuation units, the output of attenuation units is connected with the input of optical axis stable and deflection angle testing unit, time quantum test cell, energy test unit, light beam performance test unit respectively, and optical axis stable is connected with Measurement &control computer with the output of deflection angle testing unit, time quantum test cell, energy test unit, light beam performance test unit; Lock unit utilizes the synchronous shot clock of PXI case back plate, provides the time reference of whole test macro; Attenuation units completes the coupling of input luminous energy and detector dynamic range, optical axis stable and deflection angle testing unit pass through optical axis stable and the optical axis deviation of the repeatedly Laser emission of CCD measuring radiation device, time quantum test cell completes the test of encoding precision and impulse waveform, energy test unit completes the measurement of laser emission energy, light beam performance test unit completes every test of laser beam performance, and power subsystem provides the power supply of laser irradiator and test computer;

In described optical axis stable and deflection angle testing unit, radiator optical axis stable is measured and is made up of collimator objective, CCD receiving system, is arranged on adjustment pedestal; Measure the spot center of laser irradiator repeatedly Emission Lasers respectively in the position of CCD target surface, obtain departure Δ x, the Δ y of multiple position, according to the angular deviation Δ θ of the focal distance f of lens ' can obtain optical axis stable _x, Δ θ _y:

$\begin{array}{ccc}{\mathrm{\Δ\θ}}_x=\frac{\mathrm{\Δx}}{f^{\′}}& {\mathrm{\Δ\θ}}_y=\frac{\mathrm{\Δy}}{f^{\′}}& \mathrm{\Δ\θ}=\frac{\sqrt{{\mathrm{\Δx}}^2+{\mathrm{\Δy}}^2}}{f^{\′}}\end{array}---\left(1\right)$

Optical axis is the center that hot spot is the most intensive, utilizes centroid method to measure laser facula barycenter Δ x in a period of time _i, Δ y _i, then by Δ x _i, Δ y _iascending sequence also substitutes into the stability that above formula solves Laser emission optical axis.

2. as claimed in claim 1 based on the laser irradiator comprehensive performance detecting system of virtual instrument, it is characterized in that: time quantum test cell comprises impulse waveform and encoding precision test, adopt the form responding probe+oscillograph+frequency meter fast, measured by the sampling of beam splitting system speculum light leak, photodiode is adopted to convert light pulse signal to electric pulse: to be transported on high bandwidth oscilloscope and frequency meter with wide-band transmission broadband transmission by electric impulse signal, carry out data processing, real-time display also calculates impulse waveform, width, repetition rate time quantum, digital oscilloscope is connected with Measurement &control computer with frequency meter, for the acquisition of measurement data.

3., as claimed in claim 1 based on the laser irradiator comprehensive performance detecting system of virtual instrument, it is characterized in that: above-mentioned each unit is arranged on shockproof reference platform.