CN105092054A - Testing evaluation device for pyroelectric non-refrigeration infrared focal plane detector - Google Patents
Testing evaluation device for pyroelectric non-refrigeration infrared focal plane detector Download PDFInfo
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Abstract
The invention provides a testing evaluation device for a pyroelectric non-refrigeration infrared focal plane detector. The device comprises a light source black body, an adaptive board, a data collection card, a data processing module, a computer system module, and other computer general modules. A block body radiation modulation device is disposed between the light source black body and a non-refrigeration infrared focal plane detector, and is electrically connected with a synchronizing device. The synchronizing device is connected with a data collection pre-triggering device, and the data collection pre-triggering device is electrically connected with the data collection card through an amplification signal outputted by the non-refrigeration infrared focal plane detector. The device achieves the modulation of infrared radiation, meets the requirements of performance test of a pyroelectric detector, solves a problem that the testing and evaluation of the pyroelectric non-refrigeration infrared focal plane detector cannot be carried out in the prior art, enables the scale production of the pyroelectric non-refrigeration infrared focal plane detector to be possible, and reduces the testing cost.
Description
Technical field
The present invention relates to a kind of test evaluation device for pyroelectric uncooled infrared focal plane arrays detector, belong to infrared imaging system technical field.
Background technology
Detector module on focal plane of infrared ray is the important photoelectric device obtaining object scene infrared emanation information.Device can be divided into two large classes according to the working temperature height of detector: during work the responsive first temperature of detector when-100 DEG C and following refrigeration mode, work the first temperature of detector sensitivity at the non-refrigeration type of near room temperature.The principle (as Fig. 1) of non-refrigerated infrared focal plane probe is by the infrared radiation 1 of invisible for human eye scene, arrives infrared focal plane detector 3 be converted into different size electric signal 4 and be transferred to detector outside and provide other electronic units to process through lens 2.
Pyroelectric uncooled infrared focal plane arrays detector is the one of infrared focal plane detector, have low in energy consumption, noise bandwidth is little, the advantages such as thermostatic control precision is low needed for detector, when larger change occurs object and background radiation intensity, can realize continuously every detection and aiming; Pyroelectric uncooled infrared focal plane arrays detector does not need bias current, there is not the problem of detector from heating temperature difference correction, is especially suitable for field environment.Pyroelectric uncooled infrared focal plane arrays detector is made up of pyroelectric detector chip, CMOS readout circuit chip, ceramic cartridge, semiconductor cooler etc.
Usually, non-refrigerated infrared focal plane probe (as Fig. 2) is primarily of several part composition such as the shell 7 of window 8, attached cavity, the photoelectric sensor 5 being placed in shell 7 cavity, sensing circuit 6, by photoelectric sensor 5, infrared radiation is converted to electric signal, amplification and the transmission of this signal is completed again by sensing circuit 6, the cavity that shell 7 and window 8 form ensures the working environment of detector, and is outwards transmitted by the signal of sensing circuit 6.
The performance evaluation completing focus planardetector is exactly need accurately to be given in output signal 12 amplitude that the focus planardetector inputted corresponding to energy determined in black matrix, and the signal distributions situation of focus planardetector.As Fig. 3, the output signal 12 that necessary several parts are light source black matrix 9, tested non-refrigerated infrared focal plane probe 10, the drive singal 11 that sensing circuit in focus planardetector is normally worked, focus planardetector is measured for completing this, complete adaptation board 13, the drive singal 14 of adaptation board, the synchronizing signal 15 from computer acquisition of power supply and signal condition, the system be made up of this few part is commonly referred to as general infrared focus plane parameter test device.
The amplifying signal 16 that focus planardetector exports, installs data collecting card 17, data processing module 18, computer system module 19, other computer general-purpose modules 20 in a computer.Pyroelectric uncooled infrared focal plane arrays detector is as a main species of infrared focal plane detector, and to complete the accurate evaluation of this detector be necessary work.But pyroelectricity uncooled fpa detector adopts AC coupling mode of operation, needs extraneous scene to have the change of interruption.
Test focal plane test evaluation system ready-made at present all has a common ground: synchronously can not drive detector and modulated light signal, also just correctly can not gather the output signal of pyroelectric detector, thus correct digital signal can not be delivered in software for calculation.The corresponding electric signal of correct rpyroelectric infrared uncooled fpa detector to light signal can not be obtained, thus cannot the performance of pyroelectric detector be measured and be evaluated.
Summary of the invention
Be difficult to measure pyroelectric detector and the problem such as evaluation for solving, the object of the present invention is to provide a kind of test evaluation device for pyroelectric uncooled infrared focal plane arrays detector, in order to the non-refrigerated infrared focal plane probe photoelectric properties of test evaluation AC coupling mode of operation.
The present invention is realized by following technical proposal: a kind of test evaluation device for pyroelectric uncooled infrared focal plane arrays detector, comprise light source black matrix, adaptation board, data collecting card, data processing module, computer system module and other computer general-purpose modules, between described light source black matrix and non-refrigerated infrared focal plane probe, blackbody radiation modulating device is set, and blackbody radiation modulating device is electrically connected with synchronous device, synchronous device is connected with data acquisition pre-trigger device, the amplifying signal that data acquisition pre-trigger device is exported by non-refrigerated infrared focal plane probe is electrically connected with data collecting card.
Described blackbody radiation modulating device is binary optical chopper, this chopper comprises housing and copped wave sheet, this copped wave sheet is separated into by spiral of Archimedes and opens district and blocked area, wherein, be provided with the diffraction surfaces formed by diffraction pattern towards plane of light incidence in blocked area, described diffraction pattern is some group patterns and without the concentric endless belt group of intersection.The phase information that copped wave sheet rotates is extracted formation electric signal by synchronous device, passes to follow-up circuit; Chopper realizes the modulation of blackbody radiation, forms the weak periods change of radiation.
In described concentric endless belt group, the radial width of each endless belt is outwards successively decreased successively from center, and outwards successively decreases successively in the width Ye Cong center between endless belt.By preparing diffraction pattern at the block surface of the copped wave sheet blocking type chopper, copped wave sheet is made to block period, also detector can be made to receive scenery homogeneous radiation, obtain the medial temperature numerical value of real-time scenery and not imaging, and copped wave sheet makes detector receive a high-resolution scene image during opening, so just can obtain the Temperature Distribution of observing in scene and the medial temperature signal observing scene, very big reduction copped wave sheet blocks period and opens the temperature contrast of period, and the medial temperature of real-time scene can be utilized to carry out image rectification, thus improve the imageable temperature dynamic scope of thermal imaging system, the imaging temperature scope of pyroelectricity non-brake method thermal imaging system is brought up to 500 DEG C by original 50 DEG C, the range of application of thermal imaging system is significantly expanded.
The effect of blackbody radiation modulating device is variable signal continuous print blackbody radiation being changed into intermittent cycles, make non-refrigerated infrared focal plane probe obtain the input stimulus of mechanical periodicity signal, meet the object that input signal is ac-coupled to the responsive unit of detector; The effect of synchronous device is recorded by the time point that modulation signal produces, and carry out shaping; The signal passed over formed by synchronous device arrives data acquisition wild card and data collecting card is ready in real time through data acquisition pre-trigger device, Real-time Collection is carried out under data acquisition is stuck in collection that general focal plane parameter test device sends controls clock, real time data on such data collecting card can carry out processing and calculating according to pre-trigger, obtains final pyroelectricity uncooled fpa detector performance index.
When measuring and evaluate, non-refrigerated infrared focal plane probe is installed on adaptation board, open light source black matrix, adaptation board, computer system module and other computer general-purpose modules (data collecting card is arranged on computer-internal), blackbody radiation modulating device starts to rotate, synchronizing signal is sent to data acquisition pre-trigger device by synchronous device, and notification data capture card can be ready.Drive singal is given non-refrigerated infrared focal plane probe by adaptation board, the output signal that non-refrigerated infrared focal plane probe produces the blackbody radiation modulating device of process, the amplifying signal of this electric signal after exporting and amplifying arrives data collecting card, and the simulating signal of pulse signal to non-refrigerated infrared focal plane probe that data collecting card is sent here according to adaptation board gathers.The digital signal collected by the computer system module on computing machine and other computer general-purpose modules read and calculate.The foundation calculated is the average signal-to-noise ratio of the output voltage that detector is corresponding under the energy determining incident light and the distributing homogeneity of signal.The ratio of signal (enlargement factor the is identical) noise that the only detector of identical input produces is larger, detector performance more excellent (NETD and responsiveness index better); Under identical signal to noise ratio (S/N ratio), the signal homogeneity of detector is higher shows the use value of detector higher (blind element and uniformity index better).
The advantage that the present invention possesses and effect: in order to test the performance of pyroelectric uncooled infrared focal plane arrays detector, the present invention adopts and installed modulating device between light source black matrix and non-refrigerated infrared detector, the change that modulating device is interrupted the radiation formation of light source black matrix, meet the requirement that pyroelectric uncooled infrared focal plane arrays detector needs modulation, and the synchronizing signal of ac modulation is delivered to signal acquiring board card carry out synchronous acquisition.Under the irradiation of outside black matrix, output signal, through gathering, enters computing machine completes pyroelectric uncooled infrared focal plane arrays detector photoelectric properties evaluation by software.
The present invention utilizes increases radiation modulation apparatus and synchronous device between light source black matrix and tested pyroelectricity non-refrigerated infrared detector; make infrared radiation modulated; meet pyroelectric detector performance test requirement; solve the problem that prior art can not test pyroelectric uncooled infrared focal plane arrays detector and evaluate; the large-scale production of pyroelectricity non-refrigerated infrared detector is made to become possibility; reduce testing cost, for the widespread use of non-refrigerated infrared focal plane probe is laid a good foundation.
Accompanying drawing explanation
Fig. 1 is the principle of work schematic diagram of uncooled fpa detector;
Fig. 2 is the structural representation of non-refrigerated infrared focal plane probe;
Fig. 3 is traditional infrared focus plane parameter test system;
Fig. 4 is the test evaluation device for pyroelectric uncooled infrared focal plane arrays detector;
Fig. 5 is the structural representation of blackbody radiation modulating device;
Fig. 6 is the partial enlarged drawing of copped wave sheet.
Wherein: 1-infrared radiation, 2-lens, 3-infrared focal plane detector, 4-electric signal, 5-photoelectric sensor, 6-sensing circuit, 7-shell, 8-window, 9-light source black matrix, 10-non-refrigerated infrared focal plane probe, 11-drive singal, 12-outputs signal, 13-adaptation board, 14-drive singal, 15-synchronizing signal, 16-amplifying signal, 17-data collecting card, 18-data processing module, 19-computer system module, other computer general-purpose modules of 20-, 21-blackbody radiation modulating device, 22-synchronous device, 23-data acquisition pre-trigger device, 24-housing, 25-copped wave sheet, 26-opens district, 27-blocked area.
Embodiment
Below by embodiment and accompanying drawing, the present invention will be further described.
Embodiment 1
Photoelectric sensor 5 adopts barium strontium titanate (BST) ceramic preparation.
As Fig. 4, 5, 6, test evaluation device for pyroelectric uncooled infrared focal plane arrays detector comprises light source black matrix 9, adaptation board 13, data collecting card 17, data processing module 18, computer system module 19 and other computer general-purpose modules 20, between described light source black matrix 9 and non-refrigerated infrared focal plane probe 10, blackbody radiation modulating device 21 is set, and blackbody radiation modulating device 21 is electrically connected with synchronous device 22, synchronous device 22 is connected with data acquisition pre-trigger device 23, the amplifying signal 16 that data acquisition pre-trigger device 23 is exported by non-refrigerated infrared focal plane probe 10 is electrically connected with data collecting card 17.
Described blackbody radiation modulating device 21 is binary optical chopper, this chopper comprises housing 24 and copped wave sheet 25, this copped wave sheet 25 is separated into by spiral of Archimedes and opens district 26 and blocked area 27, wherein, be provided with the diffraction surfaces formed by diffraction pattern towards plane of light incidence in blocked area 27, described diffraction pattern is some group patterns and without the concentric endless belt group of intersection.The phase information that copped wave sheet rotates is extracted formation electric signal by synchronous device 22, passes to follow-up circuit; Chopper realizes the modulation of blackbody radiation, forms the weak periods change of radiation.In described concentric endless belt group, the radial width of each endless belt is outwards successively decreased successively from center, and outwards successively decreases successively in the width Ye Cong center between endless belt.By preparing diffraction pattern at the block surface of the copped wave sheet blocking type chopper, copped wave sheet is made to block period, also detector can be made to receive scenery homogeneous radiation, obtain the medial temperature numerical value of real-time scenery and not imaging, and copped wave sheet makes detector receive a high-resolution scene image during opening, so just can obtain the Temperature Distribution of observing in scene and the medial temperature signal observing scene, very big reduction copped wave sheet blocks period and opens the temperature contrast of period, and the medial temperature of real-time scene can be utilized to carry out image rectification, thus improve the imageable temperature dynamic scope of thermal imaging system, the imaging temperature scope of pyroelectricity non-brake method thermal imaging system is brought up to 500 DEG C by original 50 DEG C, the range of application of thermal imaging system is significantly expanded.
The parameter designing of described diffraction pattern is as follows, and { aL, bL} make it meet diffraction spectra m in-M to M level time, i.e. the optical power detection of 2M-1 light beam, and total diffraction efficiency P to find one group of SPA sudden phase anomalies point coordinate collection
kenough high, namely requirement
numerical value large as far as possible, and p (0)=p (± 1)=... ...=p (± m)
For evaluating optimizing process and effect thereof, definition error function
In formula
it is the theoretical target values of intensity distributions at different levels; α is the free compensating parameter of hypothesis of getting in optimizing process, and the value of α changes in 0 ~ 1 scope; The Section 1 of error function weighs the difference of design load P (m) and desired value, Section 2 weighs diffraction efficiency, the value of α is different, in error function expression formula, the size of two shared weights is just different, chooses certain α value during design according to the size required beam uniformity and diffraction efficiency;
Evaluation function and sudden change coordinate { are a very complicated nonlinear relationship between aL, bL} and phasing degree θ, are generally optimized with nonlinear optimization algorithm.Suppose that the sudden change coordinate of n-th iteration in optimizing process is for { aL, n, bL, n}, error function is E
2, in each given catastrophe point of n, { a trace change of aL, n, bL, n}, takes the change obtaining this function after inside error function to, the coordinate modification amount of n iterative process.The error function of such n-th iterative process can be expressed as the function of γ, carries out linear search to γ, obtains the γ value γ nm making En minimum, just can obtain the catastrophe point coordinate of n+1 iteration:
a
l,n+1-a
l,n＝γΔE
al,n/|ΔE
max,n
b
l,n+1-b
l,n＝γΔE
bl,n/|ΔE
max,n
If to { a obtained
l, b
lstill be unsatisfied with, then repeat said process, until obtain satisfied design parameter.
Uncooled fpa detector is applied in infrared long wave band, therefore upper wavelength X=10 μm adopted of design, diffraction pattern overall diameter: 1366 μm, and endless belt periodicity is 9, the focal length calculated: f=2591 (μm); Girdle radius: r
0=161 (μm), r
2=227 (μm) ... r
16=648 (μm) r
17=669 (μm); Minimum ring belt distance: v=20.3 (μm);
According to detector pixel center distance 48.5 μm, array scale 320 × 240, the long limit of detector aperture is 15.5mm, broadside is 11.6mm, obtain the curvilinear characteristic parameter K=10.0 of chopper thus, effective exposure efficiency η=45.1%, the row inter-sync exposure error of the responsive unit of the detector that chopper causes is 23%.
Chopper entirety adopts the Si sheet of special process, and by laser direct-writing etching diffraction plate array forming, obtaining final test result is: after directly permeation parts increases antireflection (AR) film, be better than 95% in 7 μm ~ 14 mu m waveband transmitances.In FLA part: splitting ratio is 1.2 × 103; Diffraction efficiency: η=40%; Heterogeneity: be better than 10% after multi-point sampler.
The effect of blackbody radiation modulating device 21 is variable signals continuous print blackbody radiation being changed into intermittent cycles, make non-refrigerated infrared focal plane probe 10 obtain the input stimulus of mechanical periodicity signal, meet the object that input signal is ac-coupled to the responsive unit of detector; The effect of synchronous device 22 is recorded by the time point that modulation signal produces, and carry out shaping; The signal passed over formed by synchronous device 22 is through data acquisition pre-trigger device 23 real-time arrival data acquisition wild card and data collecting card 17 is ready, data collecting card 17 is made to carry out Real-time Collection under the collection that general focal plane parameter test device sends controls clock, real time data on such data collecting card 17 can carry out processing and calculating according to pre-trigger, obtains final pyroelectricity uncooled fpa detector performance index.
When measuring and evaluate, non-refrigerated infrared focal plane probe 10 is installed on adaptation board 13, open light source black matrix 9, adaptation board 13, computer system module 19 and other computer general-purpose modules 20 (data collecting card 17 is arranged on computer-internal), blackbody radiation modulating device 21 starts to rotate, synchronizing signal is sent to data acquisition pre-trigger device 23 by synchronous device 22, and notification data capture card 17 can be ready.Drive singal 14 is given non-refrigerated infrared focal plane probe 10 by adaptation board 13, the output signal 12 that non-refrigerated infrared focal plane probe 10 produces the blackbody radiation modulating device 21 of process, the amplifying signal 16 of this electric signal after exporting and amplifying arrives data collecting card 17, and the simulating signal of pulse signal to non-refrigerated infrared focal plane probe 10 that data collecting card 17 is sent here according to adaptation board 13 gathers.The digital signal collected by the computer system module 19 on computing machine and other computer general-purpose modules 20 read and calculate.The foundation calculated is the average signal-to-noise ratio of the output voltage that detector is corresponding under the energy determining incident light and the distributing homogeneity of signal.The ratio of signal (enlargement factor the is identical) noise that the only detector of identical input produces is larger, detector performance more excellent (NETD and responsiveness index better); Under identical signal to noise ratio (S/N ratio), the signal homogeneity of detector is higher shows the use value of detector higher (blind element and uniformity index better).
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (3)
1. the test evaluation device for pyroelectric uncooled infrared focal plane arrays detector, comprise light source black matrix, adaptation board, data collecting card, data processing module, computer system module and other computer general-purpose modules, it is characterized in that: between described light source black matrix and non-refrigerated infrared focal plane probe, blackbody radiation modulating device is set, and blackbody radiation modulating device is electrically connected with synchronous device, synchronous device is connected with data acquisition pre-trigger device, the amplifying signal that data acquisition pre-trigger device is exported by non-refrigerated infrared focal plane probe is electrically connected with data collecting card.
2. test evaluation device according to claim 1, it is characterized in that: described blackbody radiation modulating device is binary optical chopper, this chopper comprises housing and copped wave sheet, this copped wave sheet is separated into by spiral of Archimedes and opens district and blocked area, wherein, be provided with the diffraction surfaces formed by diffraction pattern towards plane of light incidence in blocked area, described diffraction pattern is some group patterns and without the concentric endless belt group of intersection.
3. test evaluation device according to claim 2, is characterized in that: in described concentric endless belt group, the radial width of each endless belt is outwards successively decreased successively from center, and outwards successively decreases successively in the width Ye Cong center between endless belt.
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Application publication date: 20151125 |