CN103776531B - Near infrared weak pulse spectral radiance calibrating installation - Google Patents

Abstract

The invention discloses a kind of near infrared weak pulse spectral radiance calibrating installation, belong to technical field of optical measurement.This device comprises the light source assembly for nominal light grating spectrograph, the optical fiber component containing array fibre bundle, and the computing machine of spectral radiance calibration data processing software package is housed, the grating spectrograph containing flat filed concave grating and face battle array EMCCD; The input end of array fibre bundle is simple optical fiber, and output terminal contains the optical fiber of n root by word order; The pulsed light beam that measured pulse light source sends after optical fiber component, slit by flat filed concave grating dispersion, the photosurface that dispersed light focuses on face battle array EMCCD forms n line spectrum, computer acquisition n line spectrum also calculates the spectral radiance value of formula acquisition measured pulse light source with wavelength variations according to spectral radiance, and shows single width or several spectral radiance curves on the computer screen.The invention solves a calibration difficult problem for the spectral radiance of near infrared weak pulse light source, have broad application prospects.

Description

Near infrared weak pulse spectral radiance calibrating installation

Technical field

The invention belongs to technical field of optical measurement, relate generally to a kind of light source light spectrum spoke brightness calibration device, particularly relate to a kind of spectral radiance calibrating installation of near infrared weak pulse light source.

Background technology

In recent years, near infrared light-pulse generator is widely used in the fields such as military scouting and guidance, near infrared light-pulse generator comprises pulse xenon lamp, semiconductor pulse laser etc., initiatively light is irradiated for target detection provides, the reflected light of target contains the characteristic spectrum of near-infrared band 0.9 μm ~ 1.1 μm, received and process by military scouting or guidance unit, realize target identification.For ensureing that scouting and guidance unit have better anti-reconnaissance capability, require that the brightness of near infrared light-pulse generator spoke is more and more weak, lower than 10 ^-6w/cm ²srnm magnitude.Therefore, in the development of near infrared light-pulse generator, production and application process, the low light level spectral radiance parameter of paired pulses light source is needed to calibrate, analyze spectral radiance in its pulse width and over time, provide spectral radiance value Metrology Support for using the reconnaissance equipment of pulse faint light source.

At present, traditional near infrared light-pulse generator wavelength, spoke brightness calibration device are applicable to 10 ^-5w/cm ²light intensity light source spectral radiance calibration more than srnm magnitude.The transient state spectroradiometric quantity standard set-up of domestic Xi'an Applied Optics Research Inst. development, its core component near infrared spectrometer adopts Linear CCD Detector.This detector is arranged in a line by 512 row pixels, and putting in order by pixel exports the wavelength value in institute's light-metering source successively, can measure higher than 10 ^-5w/cm ²the spectral radiance of srnm magnitude light-pulse generator.AndorTechnology company of Britain model is the near infrared spectrometer of SR500i-B1, adopts optical fiber incident, after the dispersion of plane blazed grating, EMCCD is focused to one-way road spectrum.In the instrument, under EMCCD detector is operated in cryogenic conditions, compared to the spectrometer of Linear CCD Detector adopting non-brake method, its spectrum test sensitivity is higher; But this instrument need be equipped with the optical system such as collimating mirror and focusing mirror, cause unnecessary energy loss.In addition, this instrument can test the relative spectral actinometry curve obtaining near-infrared band scope 0.9 μm ~ 1.1 μm, has no the report of the absolute spectral radiance providing this near-infrared band.

Summary of the invention

The technical problem to be solved in the present invention is, for the deficiencies in the prior art, provides a kind of near infrared weak pulse spectral radiance calibrating installation.

For solving the problems of the technologies described above, near infrared weak pulse spectral radiance calibrating installation provided by the invention comprises light source assembly, optical fiber component, grating spectrograph, and the computing machine of spectral radiance calibration data processing software package is housed.Described grating spectrograph contains optical filter, slit, flat filed concave grating, face battle array EMCCD; Described light source assembly comprises one-dimensional movement platform, for the high temperature blackbody of nominal light grating spectrograph, white light source, high-pressure sodium lamp and pulse switch, high temperature blackbody, white light source and high-pressure sodium lamp word order are arranged on one-dimensional movement platform and the light-emitting area of three is all positioned at same plane namely demarcates face; Timing signal, promotes one-dimensional movement platform and makes the center of the light-emitting area of high temperature blackbody, white light source, high-pressure sodium lamp aim at the center of pulse switch one by one, the center of pulse switch and the center of described coupled lens just right;

Described coupled lens is convex lens, and the input end of described array fibre bundle is simple optical fiber, and output terminal contains the optical fiber of n root by word order, n >=10, and the value of n depends on the length of described slit; Coupled lens is connected by the input end of the joints of optical fibre with array fibre bundle; Array fibre bundle is identical with slit length and parallel just right, and the groove direction of flat filed concave grating is parallel with the length direction of slit with array fibre bundle, simultaneously consistent with the Width of face battle array EMCCD;

When to measured pulse light source calibration, be placed on by measured pulse light source on one-dimensional movement platform, its light-emitting area overlaps with described demarcation face and the center of coupled lens is aimed at the center of light-emitting area; The pulsed light beam that measured pulse light source sends is coupled to the input end of array fibre bundle through coupled lens, by a row light beam irradiation of array fibre bundle output terminal outgoing on optical filter, after filtering, arrive slit, incide on flat filed concave grating by the light beam of slit outgoing; The photosurface that light beam focuses on face battle array EMCCD after flat filed concave grating dispersion forms n line spectrum, and face battle array EMCCD sends into computing machine after the line spectrum signal received is converted to electric signal;

Computing machine is with storer and data collecting card and be built-in with spectral radiance calibration data processing software package, storer has known parameters used in Wavelength calibration database, spectral radiance correction factor database, spectral radiance nominal data storehouse and calibration process: wherein, the wavelength X of Wavelength calibration database corresponding to the face battle array EMCCD pixel row j that obtained by high-pressure sodium lamp _jtables of data; Spectral radiance adjusted coefficient K (the λ of spectral radiance correction factor database corresponding to the face battle array EMCCD pixel row j that obtained by high temperature blackbody _j) tables of data, the standard spectrum spoke brightness L of spectral radiance nominal data storehouse corresponding to the face battle array EMCCD pixel row j that obtained by white light source _cC(λ _j) tables of data;

Spectral radiance calibration data processing software package comprises menu module, acquisition module, computing module:

The function of described menu module shows one group of function button, spectra collection choice menus, optimum configurations hurdle and display window over the display; Function button comprises background testing button, light-pulse generator testing button, computed push-buttom; Spectra collection choice menus comprises single spectrum collection and multispectral collection two options; Optimum configurations hurdle is for inputting the width parameter τ of measured pulse light source, and display window is used for display background voltage tester curve, the voltage tester curve of measured pulse light source and spectral radiance curve;

The function of described acquisition module is, under single spectrum gathers option, when receiving background testing button commands, is gathered the background testing signal V changed with pixel row j of a face battle array EMCCD integration period output by data collecting card _bij (), calls Wavelength calibration database by background testing signal V _bij () is converted to wavelength X _jthe background voltage test signal V of change _bi(λ _j), and show with wavelength X in the display window of menu module _jthe background voltage test curve of change; When receiving the instruction of light-pulse generator testing button, gathered the light-pulse generator test signal V changed with pixel row j of a face battle array EMCCD integration period output by data collecting card _ci(j), and call Wavelength calibration database by light-pulse generator test signal V _cij () is converted to wavelength X _jthe light-pulse generator test signal V of change _ci(λ _j), and show with wavelength X in the display window of menu module _jthe light-pulse generator voltage tester curve of change; Wherein: i=1,2. ..., the pixel line number of imaging region in n, i presentation surface battle array EMCCD, n depends on the number of fibers that array fibre bundle 2-2 exports, i.e. the output beam one_to_one corresponding of each row imaging and the intrafascicular each optical fiber of array fibre; The pixel columns of imaging region in j presentation surface battle array EMCCD, j=1,2. ..., J, J depend on that light beam focuses on the pixel dimension of line spectrum width on the battle array EMCCD photosurface of face and face battle array EMCCD after flat filed concave grating dispersion, λ _jrepresent and the wavelength value corresponding to pixel row j; Under multispectral collection option, when receiving background testing button commands, M the background testing signal V changed with pixel row j exported within the τ time period by data collecting card collection face battle array EMCCD _bimj (), calls Wavelength calibration database by background testing signal V _bimj () is converted to wavelength X _jthe background testing signal V of change _bim(λ _j), and show with wavelength X one by one in the display window of menu module _jthe background voltage test curve of change; When receiving the instruction of light-pulse generator testing button, M the light-pulse generator test signal V changed with pixel row j exported within the τ time period by data collecting card collection face battle array EMCCD _cim(j), and call Wavelength calibration database by light-pulse generator test signal V _cimj () is converted to wavelength X _jthe light-pulse generator test signal V of change _cim(λ _j), and show with wavelength X one by one in the display window of menu module _jthe light-pulse generator voltage tester curve of change; Wherein: m=1,2 ... .M, m is the integration period number of face battle array EMCCD, and M=τ/T, T are the integration period of face battle array EMCCD;

Computing module function is: under single spectrum gathers option, when receiving computed push-buttom instruction, call spectral radiance correction factor database and spectral radiance nominal data storehouse, according to the spectral radiance value L (λ organizing formulae discovery measured pulse light source with next _j), and in the display window of menu module, show the spectral radiance curve of measured pulse light source with wavelength variations:

L(λ _j)＝k ₀·K(λ _j)·[V _C(λ _j)-V _B(λ _j)]

$V_B\left({\mathrm{\λ}}_j\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{V}_{\mathrm{Bi}}\left({\mathrm{\λ}}_j\right)$

$V_C\left({\mathrm{\λ}}_j\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{V}_{\mathrm{Ci}}\left({\mathrm{\λ}}_j\right)$

k ₀＝L _CC(λ _j)/L _CC0(λ _j)

K(λ _j)＝L _CBB(λ _j)/[V _CBB(λ _j)-V _B(λ _j)]

L _CC(λ _j)＝K(λ _j)·[V _CC(λ _j)-V _B(λ _j)]

In formula, j=1,2. ..., J, L _cBB(λ _j) be the theoretical spectral spoke brightness value of high temperature blackbody under 2856K colour temperature, L _cC(λ _j) be the standard spectrum spoke brightness value of white light source, L _cC0for spectral radiance value when white light source dispatches from the factory, V _cBB(λ _j) be the test voltage value of high temperature blackbody under 2856K colour temperature, V _cC(λ _j) be the test voltage value of white light source, above-mentioned five parameters are given value; Under multispectral collection option, when receiving computed push-buttom instruction, call spectral radiance correction factor database, spectral radiance nominal data storehouse, repeatedly according to organizing formulae discovery measured pulse light source with next from period 1 number to the spectral radiance value L of M periodicity _m(λ _j), and the spectral radiance curve of measured pulse light source with wavelength variations is shown one by one by the order of periodicity in the display window of menu module;

L _m(λ _j)＝k ₀·K(λ _j)·[V _Cm(λ _j)-V _Bm(λ _j)]

$V_{\mathrm{Cm}}\left({\mathrm{\λ}}_j\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{V}_{\mathrm{Cm}}\left({\mathrm{\λ}}_j\right)$

$V_{\mathrm{Bm}}\left({\mathrm{\λ}}_j\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{V}_{\mathrm{Bim}}\left({\mathrm{\λ}}_j\right)$

k ₀＝L _CC(λ _j)/L _CC0(λ _j)

K(λ _j)＝L _CBB(λ _j)/[V _CBB(λ _j)-V _B(λ _j)]

L _CC(λ _j)＝K(λ _j)·[V _CC(λ _j)-V _B(λ _j)]

Adopt the computation process of above-mentioned one group of formula to be: when m=1, by j=1,2. ..., J time λ _jsubstitute into above-mentioned formula and obtain first spectral radiance value L ₁(λ _j), when m=2, by j=1,2. ..., J time λ _jsubstitute into above-mentioned formula and obtain second spectral radiance value L ₂(λ _j), until during m=M, by j=1,2. ..., J time λ _jsubstitute into above-mentioned formula and obtain M spectral radiance value L _m(λ _j).

Beneficial effect of the present invention is embodied in following three aspects:

(1) the present invention adopts high temperature blackbody, white light source, high-pressure sodium lamp, pulse switch to constitute light-pulse generator assembly, utilize the theoretical value of high temperature blackbody spectral radiance value, demarcate and obtain the spectral radiance correction factor that in grating spectrograph, face battle array EMCCD pixel row are corresponding; Utilize white light source spectral radiance to export uniform feature, demarcate and obtain the standard spectrum spoke brightness value that in grating spectrograph, face battle array EMCCD pixel row are corresponding; Utilize the demarcation of the characteristic wavelength of high-pressure sodium lamp to obtain the wavelength value of the pixel row correspondence of face battle array EMCCD in grating spectrograph, thus solve the accurate calibration problem of near infrared weak pulse spectral radiance calibrating installation.。

(2) the present invention is when to measured pulse light source calibration, tested light beam enters spectrograph slit by fibre bundle array, again by the photosurface that focuses on face battle array EMCCD after flat filed concave grating dispersion forms the capable line spectrum with wavelength variations of n, after the output signal of computing machine opposite battle array EMCCD carries out respective handling, obtain the spectral radiance value of measured pulse light source.In processing procedure, the background signal at each wavelength place or test signal are the summing signal of the capable signal of n, thus achieve the measurement of the faint spectral radiance of near infrared light-pulse generator.

(3) in the present invention, grating spectrograph have employed flat filed concave grating, compared to plane blazed grating, flat filed concave grating integrates dispersion and focusing function, thus grating spectrograph is made to eliminate collimating mirror and focusing mirror, simplify light path, reduce and reflect by complex optical path the energy loss brought.Simultaneously because flat filed concave grating has aberration correction function, thus ensure that the defocusing amount in each line spectrum face of dispersed light beam imaging is zero, and then improve the measuring accuracy of spectral radiance of the present invention.

Accompanying drawing explanation

Fig. 1 is near infrared weak pulse spectral radiance calibrating installation of the present invention composition schematic diagram.

Fig. 2 is the line spectrum location drawing of grating spectrograph in the present invention.

Embodiment

Below in conjunction with accompanying drawing and preferred embodiment, the present invention is described in further detail.

As shown in Figure 1, the preferred embodiment of the present invention comprises light source assembly 1, optical fiber component 2 containing coupled lens 2-1 and array fibre bundle 2-2, grating spectrograph 3 and the computing machine 4 of spectral radiance calibration data processing software package is housed.

Light source assembly 1 comprises for high temperature blackbody 1-1, the white light source 1-2 of nominal light grating spectrograph 3, high-pressure sodium lamp 1-3, pulse switch 1-5, one-dimensional movement platform 1-6.The colour temperature that high temperature blackbody 1-1 selects Quan E physical study institute to develop is the black matrix of 2856K, its Main Function is the theoretical spectral spoke brightness value according to its radiation, and adopts conventional method of testing to obtain the spectral radiance correction factor that in grating spectrograph 3, battle array EMCCD3-4 pixel row in face are corresponding.White light source 1-2 adopts U.S. Energetiq Products, model is EQ-99CAL, this white light source 1-2 is by Laser Driven, its spectral radiance exports evenly, its Main Function adopts conventional scaling method, obtains the standard spectrum spoke brightness value that in grating spectrograph 3, battle array EMCCD3-4 pixel row in face are corresponding.High-pressure sodium lamp 1-3 selects Shanghai Ya Ming electric bulbs factory to produce GGQ80 type high-pressure sodium lamp, and its Main Function is that the pixel adopting conventional scaling method to obtain face battle array EMCCD3-4 in grating spectrograph 3 arranges corresponding wavelength value.High temperature blackbody 1-1, white light source 1-2 and high-pressure sodium lamp 1-3 word order are arranged on one-dimensional movement platform 1-6 and the light-emitting area of three is all positioned at same plane namely demarcates face.When carrying out timing signal near infrared weak pulse spectral radiance calibrating installation, make the center of the light-emitting area of high temperature blackbody 1-1, white light source 1-2, high-pressure sodium lamp 1-3 aim at the center of pulse switch 1-5 one by one by promoting one-dimensional movement platform 1-6, and in the center of pulse switch 1-5 and optical fiber component 2, the center of coupled lens 2-1 is just right.When calibrating measured pulse light source 1-4, pulse switch 1-5 need be shifted out light path, measured pulse light source 1-4 is placed on one-dimensional movement platform 1-6 simultaneously, and the light-emitting area of this light-pulse generator 1-4 is overlapped with demarcation face and the center of coupled lens 2-1 is aimed at the center of light-emitting area.

In optical fiber component 2, coupled lens 2-1 is convex lens, and its clear aperture is 8mm, and focal length is 10mm.Array fibre bundle 2-2 selects the SR-OPT-8002 type product of Andor Technology company of Britain.The input end of this array fibre bundle 2-2 is simple optical fiber, and output terminal contains 19 optical fiber by word order and the length of output terminal is 2.4mm, and the core diameter of the every root optical fiber of output is 100 μm, and numerical aperture is 0.22.Coupled lens 2-1 is connected by the input end of the joints of optical fibre with array fibre bundle 2-2, and in the present embodiment, the model of the joints of optical fibre is SMA905.The value of the number of fibers n of array fibre bundle 2-2 output terminal depends on and the length of slit 3-2 in grating spectrograph 3 is usually not less than 10.

Grating spectrograph 3 is containing optical filter 3-1, slit 3-2, flat filed concave grating 3-3, face battle array EMCCD3-4.Optical filter 3-1 diameter is 10mm, and thickness is 2mm, and material is K9 glass, and surface is coated with the optical film that cutoff wavelength is 560nm.Slit 3-2 is that American National Instrument Aperture company produces, and its width is 10 μm, error ± 1 μm, and length is 2.4mm.Flat filed concave grating 3-3 clear aperture is 81.3133mm, the distance at incident light focus and flat filed concave grating 3-3 center is 165.0mm, the numerical aperture of incident light is 0.22, wavelength band is 0.9 μm ~ 1.1 μm, when 0.9 μm, dispersive power is 8.3586nm/mm, when 1.0 μm, dispersive power is 7.8797nm/mm, and when 1.1 μm, dispersive power is 7.3103nm/mm.Focus on after this grating dispersion and form n line spectrum, so-called line spectrum refers to that in dispersed light beam, defocusing amount is the spectrum face of zero, the width of each line spectrum is 25.3830mm (see Fig. 2), in line spectrum, the position of 0.9 mum wavelength and the angle at flat filed concave grating center and distance are respectively 11.0086 ° and 175.0759mm, and the position of 1.1 mum wavelengths and the angle of this raster center and distance are respectively 18.6289 ° and 183.7910mm.Face battle array EMCCD3-4 is that ANDOR Technology company of Britain produces DU970P-BVF type EMCCD, and under being operated in the environment of-100 DEG C of refrigeration, quantum efficiency is up to 95%, and the integration period T of face battle array EMCCD is 0.6ms, and pixel number is 200 × 1600.In the present embodiment, only have employed 19 × 1587 pixels, each pixel dimension is 16 μm × 16 μm.Slit 3-2 is positioned in the focus of flat filed concave grating 3-3, and face battle array EMCCD3-4 is towards the dispersed light beam side of the outgoing of flat filed concave grating 3-3, and its photosurface is positioned on the line spectrum face of this dispersed light beam.

The light beam that one of them light source of light source assembly 1 sends or radiation are converted to pulsed light beam and pulsed light beam is coupled to the input end of array fibre bundle 2-2 through coupled lens 2-1 through pulse switch 1-5, or the pulsed light beam that measured pulse light source 1-4 sends directly is coupled to the input end of array fibre bundle 2-2 through coupled lens 2-1, by a row light beam irradiation of array fibre bundle 2-2 output terminal outgoing on optical filter 3-1, after filtering, arrive slit 3-2, incide on flat filed concave grating 3-3 by the light beam of slit 3-2 outgoing; The photosurface that light beam focuses on face battle array EMCCD3-4 after flat filed concave grating 3-3 dispersion forms 19 line spectrum, and face battle array EMCCD3-4 sends into computing machine 4 after the line spectrum signal received is converted to electric signal.Wherein, the groove direction of flat filed concave grating 3-3 is vertical direction (see Fig. 1), array fibre bundle 2-2 is identical with slit 3-2 length and parallel just right, the groove direction of flat filed concave grating 3-3 is parallel with the length direction of slit 3-2 with array fibre bundle 2-2, simultaneously consistent with the Width of face battle array EMCCD3-4.

Computing machine 4 is with storer and data collecting card and be built-in with spectral radiance calibration data processing software package and calibration software bag, known parameters used in memory built-in Wavelength calibration database, spectral radiance correction factor database, spectral radiance nominal data storehouse and calibration: wherein, the wavelength X of Wavelength calibration database corresponding to the face battle array EMCCD pixel row j that obtained by high-pressure sodium lamp _jtables of data; Spectral radiance correction factor database is the spectral radiance adjusted coefficient K (λ that the face battle array EMCCD pixel row j that obtained by high temperature blackbody is corresponding _j) tables of data, spectral radiance nominal data storehouse is the standard spectrum spoke brightness L that the face battle array EMCCD pixel row j that obtained by white light source is corresponding _cC(λ _j) tables of data.

Calibration software bag is prior art, its function be when computing machine 4 collect with high temperature blackbody 1-1, white light source 1-2 or high-pressure sodium lamp 1-3 for input light or radiation time face battle array EMCCD output signal after, above-mentioned signal is processed accordingly, and the corresponding wavelength X obtained corresponding to EMCCD pixel row j _jtables of data, the spectral radiance adjusted coefficient K (λ that face battle array EMCCD pixel row j is corresponding _j) tables of data and standard spectrum spoke brightness L corresponding to face battle array EMCCD pixel row j _cC(λ _j) tables of data, and be deposited into the form of database in the storer of computing machine 4 for calling during measured pulse light source calibration.

Spectral radiance calibration data processing software package comprises menu module, acquisition module, computing module.The function of menu module shows one group of function button, spectra collection choice menus, optimum configurations hurdle and display window on a computer display.Function button comprises background testing button, light-pulse generator testing button, computed push-buttom.Spectra collection choice menus comprises single spectrum collection and multispectral collection two options; Optimum configurations hurdle is for inputting the width parameter τ of measured pulse light source, and display window is used for display background voltage tester curve, the voltage tester curve of measured pulse light source and spectral radiance curve.

The function of acquisition module is, under single spectrum gathers option, when receiving background testing button commands, is gathered the background testing signal V changed with pixel row j of a face battle array EMCCD integration period output by data collecting card _bij (), calls Wavelength calibration database by background testing signal V _bij () is converted to wavelength X _jthe background testing signal V of change _bi(λ _j), and show with wavelength X in the display window of menu module _jthe background voltage test curve of change; When receiving the instruction of light-pulse generator testing button, gathered the light-pulse generator test signal V changed with pixel row j of a face battle array EMCCD integration period output by data collecting card _ci(j), and call Wavelength calibration database by light-pulse generator test signal V _cij () is converted to the light-pulse generator test signal V with wavelength variations _ci(λ _j), and show with wavelength X in the display window of menu module _jthe light-pulse generator voltage tester curve of change.Wherein: i=1,2. ..., the pixel line number of imaging region in n, i presentation surface battle array EMCCD, the pixel columns of imaging region in j presentation surface battle array EMCCD, j=1,2. ..., J.N depends on the number of fibers that array fibre bundle exports, i.e. the output beam one_to_one corresponding of each row imaging and the intrafascicular each optical fiber of array fibre; J depends on that light focuses on the pixel dimension of line spectrum width on the battle array EMCCD photosurface of face and face battle array EMCCD after flat filed concave grating 3-3 dispersion, the pixel dimension of face battle array EMCCD should be greater than the resolution that flat filed concave grating 3-3 prescribes a time limit in wavelength coverage, and is less than the half width FWHM of flat filed concave grating at centre wavelength spectral line.In the present embodiment, n=19, J=1587, the resolution that flat filed concave grating is prescribed a time limit in wavelength coverage is 0.0804 μm, is 61.12 μm at the half width FWHM of centre wavelength spectral line.λ _jrepresent and the wavelength value corresponding to pixel row j.Because in pixel used in the battle array EMCCD of face row, 1587 pixels cover the wavelength coverage of flat filed concave grating dispersion, the wavelength difference of each row and its previous column is 0.126nm, the wavelength that first row is corresponding is 900nm, the wavelength that secondary series is corresponding is 900nm+0.126nm, and the wavelength that last row are corresponding is 1100nm.

Under multispectral collection option, when receiving background testing button commands, M the background testing signal V changed with pixel row j exported within the τ time by data collecting card collection face battle array EMCCD _bimj (), calls Wavelength calibration database by background testing signal V _bimj () is converted to wavelength X _jthe background testing signal V of change _bim(λ _j), and show with wavelength X one by one in the display window of menu module _jthe background voltage test curve of change; When receiving the instruction of light-pulse generator testing button, M the light-pulse generator test signal V changed with pixel row j exported within the τ time period by data collecting card collection face battle array EMCCD _cim(j), and call Wavelength calibration database by light-pulse generator test signal V _cimj () is converted to wavelength X _jthe light-pulse generator test signal V of change _cim(λ _j), and show with wavelength X one by one in the display window of menu module _jthe light-pulse generator voltage tester curve of change; Wherein: m=1,2 ... .M, m is the integration period number of EMCCD, and M=τ/T, T are the integration period of face battle array EMCCD.

Computing module function is: under single spectrum gathers option, when receiving computed push-buttom instruction, call spectral radiance correction factor database and spectral radiance nominal data storehouse, and according to organizing the spectral radiance value L (λ of formulae discovery measured pulse light source with next _j), and in the display window of menu module, show the spectral radiance curve of measured pulse light source with wavelength variations:

L(λ _j)＝k ₀·K(λ _j)·[V _C(λ _j)-V _B(λ _j)]

$V_B\left({\mathrm{\λ}}_j\right)=\underset{i=1}{\overset{19}{\mathrm{\Σ}}}{V}_{\mathrm{Bi}}\left({\mathrm{\λ}}_j\right)$

$V_C\left({\mathrm{\λ}}_j\right)=\underset{i=1}{\overset{19}{\mathrm{\Σ}}}{V}_{\mathrm{Ci}}\left({\mathrm{\λ}}_j\right)$

k ₀＝L _CC(λ _j)/L _CC0(λ _j)

K(λ _j)＝L _CBB(λ _j)/[V _CBB(λ _j)-V _B(λ _j)]

L _CC(λ _j)＝K(λ _j)·[V _CC(λ _j)-V _B(λ _j)]

In formula, j=1,2. ..., 1587, L _cBB(λ _j) be the theoretical spectral spoke brightness value of high temperature blackbody 1-1 under 2856K colour temperature, L _cC(λ _j) be the standard spectrum spoke brightness value of white light source 1-2, L _cC0for spectral radiance value when white light source 1-2 dispatches from the factory; V _cBB(λ _j) be the test voltage value of high temperature blackbody 1-1 under 2856K colour temperature, V _cC(λ _j) be the test voltage value of white light source 1-2.Above-mentioned five parameters are given value.

Under multispectral collection option, when receiving computed push-buttom instruction, call spectral radiance correction factor database, spectral radiance nominal data storehouse, repeatedly according to organizing formulae discovery measured pulse light source with next from period 1 number to the spectral radiance value L of M periodicity _m(λ _j), and the spectral radiance curve of measured pulse light source with wavelength variations is shown one by one by the order of periodicity in the display window of menu module.

L _m(λ _j)＝k ₀·K(λ _j)·[V _Cm(λ _j)-V _Bm(λ _j)]

$V_{\mathrm{Cm}}\left({\mathrm{\λ}}_j\right)=\underset{i=1}{\overset{19}{\mathrm{\Σ}}}{V}_{\mathrm{Cim}}\left({\mathrm{\λ}}_j\right)$

$V_{\mathrm{Bm}}\left({\mathrm{\λ}}_j\right)=\underset{i=1}{\overset{19}{\mathrm{\Σ}}}{V}_{\mathrm{Bim}}\left({\mathrm{\λ}}_j\right)$

k ₀＝L _CC(λ _j)/L _CC0(λ _j)

K(λ _j)＝L _CBB(λ _j)/[V _CBB(λ _j)-V _B(λ _j)]

L _CC(λ _j)＝K(λ _j)·[V _CC(λ _j)-V _B(λ _j)]

Adopt the computation process of above-mentioned one group of formula to be: when m=1, by j=1,2. ..., 1587 time λ _jsubstitute into above-mentioned formula and obtain first spectral radiance value L ₁(λ _j), when m=2, by j=1,2. ..., 1587 time λ _jsubstitute into above-mentioned formula and obtain second spectral radiance value L ₂(λ _j), until during m=M, by j=1,2. ..., 1587 time λ _jsubstitute into above-mentioned formula and obtain M spectral radiance value L _m(λ _j).

In the present embodiment, the using method of near infrared weak pulse spectral radiance calibrating installation is as follows:

1) be placed on one-dimensional platform 1-6 by measured pulse light source 1-4, pulse switch 1-5 is shifted out light path, measured pulse light source 1-4 is moved into light path and makes the center of its light-emitting area aim at the center of coupled lens 2-1 by manual one-dimensional platform 1-6; Open the power switch of face battle array EMCCD3-4 and computing machine 4.

2) if the pulsewidth of measured pulse light source 1-4 is less than or equal to the integration period of face battle array EMCCD in this calibrating installation, then gather in choice menus at computer screen homepage polishing wax and select single spectrum to gather option; Click background testing button on computer screen homepage, bias light is after the coupled lens in this calibrating installation, array fibre bundle, optical filter, slit, flat filed concave grating, quilt cover battle array EMCCD is converted to electric signal after receiving, and shows with wavelength X in the display window of menu module by after this signal of computer acquisition _jthe background voltage test curve of change; Light measured pulse light source, after it is stable, click light-pulse generator testing button on computer screen homepage, the light that measured pulse light source sends is after the coupled lens in this calibrating installation, array fibre bundle, optical filter, slit, flat filed concave grating, quilt cover battle array EMCCD is converted to electric signal after receiving, and by the measured pulse light source voltage test curve shown after this signal of computer acquisition with wavelength variations; Click computed push-buttom on computer screen homepage, the spectral radiance value curve with wavelength variations of Computer display measured pulse light source.

3) if the pulsewidth of measured pulse light source 1-4 is greater than the integration period of this calibrating installation, then gather in choice menus at computer screen homepage polishing wax and select multispectral collection option; The width parameter τ of measured pulse light source is inputted in the optimum configurations hurdle of menu module; Click background testing button on computer screen homepage, bias light is after the coupled lens in this calibrating installation, array fibre bundle, optical filter, slit, flat filed concave grating, quilt cover battle array EMCCD is converted to electric signal after receiving, and shows one by one with wavelength X to M periodicity by from period 1 number in the display window of menu module by after this signal of computer acquisition _jthe background voltage test curve of change; Light measured pulse light source, after it is stable, click light-pulse generator testing button on computer screen homepage, the light that measured pulse light source sends is after the coupled lens in this calibrating installation, array fibre bundle, optical filter, slit, flat filed concave grating, quilt cover battle array EMCCD receive after be converted to electric signal, and by after this signal of computer acquisition by receiving the measured pulse light source voltage test curve of rear display with wavelength variations one by one from period 1 number to M periodicity; Click computed push-buttom on computer screen homepage, and shown the spectral radiance curve with wavelength variations of measured pulse light source by computing machine by period 1 number to M periodicity one by one.

Claims (2)

1. a near infrared weak pulse spectral radiance calibrating installation, comprise light source assembly (1), grating spectrograph (3), the computing machine (4) of spectral radiance calibration data processing software package is housed, it is characterized in that: also comprise the optical fiber component (2) containing coupled lens (2-1) and array fibre bundle (2-2), described grating spectrograph (3) is containing optical filter (3-1), slit (3-2), flat filed concave grating (3-3), face battle array EMCCD (3-4); Described light source assembly (1) comprises one-dimensional movement platform (1-6), for the high temperature blackbody (1-1) of nominal light grating spectrograph (3), white light source (1-2), high-pressure sodium lamp (1-3) and pulse switch (1-5), high temperature blackbody (1-1), white light source (1-2) and high-pressure sodium lamp (1-3) word order are arranged on that one-dimensional movement platform (1-6) is upper and the light-emitting area of three is all positioned at same plane namely demarcates face; Timing signal, promote one-dimensional movement platform (1-6) make the center of the light-emitting area of high temperature blackbody (1-1), white light source (1-2), high-pressure sodium lamp (1-3) aim at the center of pulse switch (1-5) one by one, the center of pulse switch (1-5) and the center of described coupled lens (2-1) just right;

Described coupled lens (2-1) is convex lens, the input end of described array fibre bundle (2-2) is simple optical fiber, output terminal contains the optical fiber of n root by word order, n >=10, and the value of n depends on the length of described slit (3-2); Coupled lens (2-1) is connected by the input end of the joints of optical fibre with array fibre bundle (2-2); Array fibre bundle (2-2) is identical with slit (3-2) length and parallel just right, the groove direction of flat filed concave grating (3-3) is parallel with the length direction of slit (3-2) with array fibre bundle (2-2), simultaneously consistent with the Width of face battle array EMCCD (3-4);

When calibrating measured pulse light source (1-4), be placed on by measured pulse light source (1-4) on one-dimensional movement platform (1-6), its light-emitting area overlaps with described demarcation face and the center of coupled lens (2-1) is aimed at the center of light-emitting area; The pulsed light beam that measured pulse light source (1-4) sends is coupled to the input end of array fibre bundle (2-2) through coupled lens (2-1), by a row light beam irradiation of array fibre bundle (2-2) output terminal outgoing on optical filter (3-1), after filtering, arrive slit (3-2), incide on flat filed concave grating (3-3) by the light beam of slit (3-2) outgoing; The photosurface that light beam focuses on face battle array EMCCD (3-4) after flat filed concave grating (3-3) dispersion forms n line spectrum, and face battle array EMCCD (3-4) sends into computing machine (4) after the line spectrum signal received is converted to electric signal;

Computing machine (4) is with storer and data collecting card and be built-in with spectral radiance calibration data processing software package, storer has known parameters used in Wavelength calibration database, spectral radiance correction factor database, spectral radiance nominal data storehouse and calibration process: wherein, the wavelength X of Wavelength calibration database corresponding to the face battle array EMCCD pixel row j that obtained by high-pressure sodium lamp (1-3) _jtables of data; Spectral radiance adjusted coefficient K (the λ of spectral radiance correction factor database corresponding to the face battle array EMCCD pixel row j that obtained by high temperature blackbody (1-1) _j) tables of data, the standard spectrum spoke brightness L of spectral radiance nominal data storehouse corresponding to the face battle array EMCCD pixel row j that obtained by white light source (1-2) _cC(λ _j) tables of data;

Spectral radiance calibration data processing software package comprises menu module, acquisition module, computing module:

The function of described menu module shows one group of function button, spectra collection choice menus, optimum configurations hurdle and display window on a computer display; Function button comprises background testing button, light-pulse generator testing button, computed push-buttom; Spectra collection choice menus comprises single spectrum collection and multispectral collection two options; Optimum configurations hurdle is for inputting the width parameter τ of measured pulse light source, and display window is used for display background voltage tester curve, the voltage tester curve of measured pulse light source and spectral radiance curve;

The function of described acquisition module is, under single spectrum gathers option, when receiving background testing button commands, is gathered the background testing signal V changed with pixel row j of a face battle array EMCCD integration period output by data collecting card _bij (), calls Wavelength calibration database by background testing signal V _bij () is converted to wavelength X _jthe background voltage test signal V of change _bi(λ _j), and show with wavelength X in the display window of menu module _jthe background voltage test curve of change; When receiving the instruction of light-pulse generator testing button, gathered the light-pulse generator test signal V changed with pixel row j of a face battle array EMCCD integration period output by data collecting card _ci(j), and call Wavelength calibration database by light-pulse generator test signal V _cij () is converted to wavelength X _jthe light-pulse generator test signal V of change _ci(λ _j), and show with wavelength X in the display window of menu module _jthe light-pulse generator voltage tester curve of change; Wherein: i=1,2. ..., the pixel line number of imaging region in n, i presentation surface battle array EMCCD, n depends on the number of fibers that array fibre bundle (2-2) exports, i.e. the output beam one_to_one corresponding of each row imaging and the intrafascicular each optical fiber of array fibre; The pixel columns of imaging region in j presentation surface battle array EMCCD, j=1,2. ..., J, J depend on that light beam focuses on the pixel dimension of line spectrum width on the battle array EMCCD photosurface of face and face battle array EMCCD after flat filed concave grating (3-3) dispersion, λ _jrepresent and the wavelength value corresponding to pixel row j; Under multispectral collection option, when receiving background testing button commands, M the background testing signal V changed with pixel row j exported within the τ time period by data collecting card collection face battle array EMCCD _bimj (), calls Wavelength calibration database by background testing signal V _bimj () is converted to wavelength X _jthe background testing signal V of change _bim(λ _j), and show with wavelength X one by one in the display window of menu module _jthe background voltage test curve of change; When receiving the instruction of light-pulse generator testing button, M the light-pulse generator test signal V changed with pixel row j exported within the τ time period by data collecting card collection face battle array EMCCD _cim(j), and call Wavelength calibration database by light-pulse generator test signal V _cimj () is converted to wavelength X _jthe light-pulse generator test signal V of change _cim(λ _j), and show with wavelength X one by one in the display window of menu module _jthe light-pulse generator voltage tester curve of change; Wherein: m=1,2 ... .M, m is the integration period number of face battle array EMCCD, and M=τ/T, T are the integration period of face battle array EMCCD;

Computing module function is: under single spectrum gathers option, when receiving computed push-buttom instruction, call spectral radiance correction factor database and spectral radiance nominal data storehouse, according to the spectral radiance value L (λ organizing formulae discovery measured pulse light source with next _j), and in the display window of menu module, show the spectral radiance curve of measured pulse light source with wavelength variations:

L(λ _j)＝k ₀·K(λ _j)·[V _C(λ _j)-V _B(λ _j)]

$V_B\left({\mathrm{\λ}}_j\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{V}_{\mathrm{Bi}}\left({\mathrm{\λ}}_j\right)$

$V_C\left({\mathrm{\λ}}_j\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{V}_{\mathrm{Ci}}\left({\mathrm{\λ}}_j\right)$

k ₀＝L _CC(λ _j)/L _CC0(λ _j)

K(λ _j)＝L _CBB(λ _j)/[V _CBB(λ _j)-V _B(λ _j)]

L _CC(λ _j)＝K(λ _j)·[V _CC(λ _j)-V _B(λ _j)]

In formula, j=1,2. ..., J, L _cBB(λ _j) be the theoretical spectral spoke brightness value of high temperature blackbody under 2856K colour temperature, L _cC(λ _j) be the standard spectrum spoke brightness value of white light source, L _cC0for spectral radiance value when white light source dispatches from the factory, V _cBB(λ _j) be the test voltage value of high temperature blackbody under 2856K colour temperature, V _cC(λ _j) be the test voltage value of white light source, above-mentioned five parameters are given value; Under multispectral collection option, when receiving computed push-buttom instruction, call spectral radiance correction factor database, spectral radiance nominal data storehouse, repeatedly according to organizing formulae discovery measured pulse light source with next from period 1 number to the spectral radiance value L of M periodicity _m(λ _j), and the spectral radiance curve of measured pulse light source with wavelength variations is shown one by one by the order of periodicity in the display window of menu module;

L _m(λ _j)＝k ₀·K(λ _j)·[V _Cm(λ _j)-V _Bm(λ _j)]

$V_{\mathrm{Cm}}\left({\mathrm{\λ}}_j\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{V}_{\mathrm{Cim}}\left({\mathrm{\λ}}_j\right)$

$V_{\mathrm{Bm}}\left({\mathrm{\λ}}_j\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{V}_{\mathrm{Bim}}\left({\mathrm{\λ}}_j\right)$

k ₀＝L _CC(λ _j)/L _CC0(λ _j)

K(λ _j)＝L _CBB(λ _j)/[V _CBB(λ _j)-V _B(λ _j)]

L _CC(λ _j)＝K(λ _j)·[V _CC(λ _j)-V _B(λ _j)]

Adopt the computation process of above-mentioned one group of formula to be: when m=1, by j=1,2. ..., J time λ _jsubstitute into above-mentioned formula and obtain first spectral radiance value L ₁(λ _j), when m=2, by j=1,2. ..., J time λ _jsubstitute into above-mentioned formula and obtain second spectral radiance value L ₂(λ _j), until during m=M, by j=1,2. ..., J time λ _jsubstitute into above-mentioned formula and obtain M spectral radiance value L _m(λ _j).

2. near infrared weak pulse spectral radiance calibrating installation according to claim 1, is characterized in that: the wavelength band of described flat filed concave grating (3-3) is 0.9 μm ~ 1.1 μm, and after dispersion, the width in spectrum face is 25.3830mm; The width of described slit (3-2) is 10 μm; The pixel dimension of described battle array EMCCD (3-4) is 16 μm × 16 μm, gets n=19, J=1587, T=0.6ms.