CN103776531A - Near infrared weak pulse spectral radiance calibration device - Google Patents

Abstract

The invention discloses a near infrared weak pulse spectral radiance calibration device which belongs to the technical field of optical metrology. The device comprises a light source component which is used for grating spectrometer calibration, an optical fiber component with an array optical fiber bundle, a computer provided with a spectral radiance calibration data processing software package and a grating spectrometer with a flat field concave surface grating and a surface array EMCCD. The input end of the array optical fiber bundle is a single optical fiber, and the output end comprises n optical fibers in line arrangement. A pulse light beam emitted by a measured pulse light source passes through the optical fiber component and a slit, and is dispersed by the flat field concave surface grating. Dispersed lights are focused onto the photosensitive surface of the surface array EMCCD to form n rows of line spectrum. The computer collects n rows of line spectrum, acquires the spectral radiance value of the measured pulse light source changing with wavelength according to a spectral radiance calculation formula, and shows a single width or multi width spectral radiance curve on a computer screen. The device provided by the invention solves the problem of difficult calibration of the spectral radiance of a near infrared weak pulse light source, and has a broad application prospect.

Description

The faint pulse spectrum spoke of near infrared brightness calibration device

Technical field

The invention belongs to optical metrology technical field, relate generally to a kind of light source light spectrum spoke brightness calibration device, relate in particular to the spectral radiance calibrating installation of the faint light-pulse generator of a kind of near infrared.

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., for target detection provides initiatively light irradiation, the characteristic spectrum that the reflected light of target has comprised near-infrared band 0.9 μ m～1.1 μ m, received and process by military scouting or guidance unit, realize target identification.For guaranteeing that scouting and guidance unit have better anti-reconnaissance capability, a little less than requiring the brightness more and more of near infrared light-pulse generator spoke, lower than 10 ^-6w/cm ²srnm magnitude.Therefore, in development, production and the application process of near infrared light-pulse generator, need the low light level spectral radiance parameter of paired pulses light source to calibrate, analyze in its pulse width spectral radiance over time, for the reconnaissance equipment that uses pulse faint light source provides spectral radiance value Metrology Support.

At present, traditional near infrared light-pulse generator wavelength, spoke brightness calibration device are applicable to 10 ^-5w/cm ²high light light source light spectrum spoke brightness 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, puts in order and exports successively the wavelength value in institute's photometry source by pixel, can measure higher than 10 ^-5w/cm ²the spectral radiance of srnm magnitude light-pulse generator.The near infrared spectrometer that Andor Technology company of Britain model is SR500i-B1, adopts optical fiber incident, after the dispersion of plane blazed grating, is focused to one-way road spectrum on EMCCD.In this instrument, because EMCCD detector is operated under refrigeration condition, than the spectrometer of Linear CCD Detector that adopts non-refrigeration, 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 be tested the relative spectral actinometry curve that obtains near-infrared band scope 0.9 μ m～1.1 μ m, has no the report of the absolute spectral radiance that provides 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, to provide the faint pulse spectrum spoke of a kind of near infrared brightness calibration device.

For solving the problems of the technologies described above, the faint pulse spectrum spoke of near infrared provided by the invention brightness calibration device comprises light source assembly, optical fiber component, and grating spectrograph, is equipped with the computing machine of spectral radiance calibration data processing software package.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 high temperature blackbody, white light source, high-pressure sodium lamp and the pulse switch of nominal light grating spectrograph, high temperature blackbody, white light source and high-pressure sodium lamp word order are arranged on one-dimensional movement platform and three's light-emitting area is all positioned at same plane and 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 one by one the center of pulse switch, and the center of pulse switch and the center of described coupled lens are 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 n root by the optical fiber of word order, n >=10, and the value of n depends on the length of described slit; Coupled lens is connected with the input end of array fibre bundle by the joints of optical fibre; Array fibre bundle is identical with slit length and parallel just right, and the groove direction of flat filed concave grating is vertical with the length direction of array fibre bundle and slit, simultaneously consistent with the length direction of face battle array EMCCD;

When to measured pulse light source calibration, measured pulse light source is placed on one-dimensional movement platform, its light-emitting area is aimed at the center of coupled lens with the center of described demarcation face coincidence and 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 irradiates of array fibre bundle output terminal outgoing to optical filter, after filtering, arrive slit, incided on flat filed concave grating by the light beam of slit outgoing; Light beam focuses on the photosurface of face battle array EMCCD and forms n line spectrum after flat filed concave grating dispersion, and face battle array EMCCD sends into computing machine after the line spectrum signal receiving 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, Wavelength calibration database is the corresponding wavelength X of face battle array EMCCD pixel row j obtaining by high-pressure sodium lamp _jtables of data; Spectral radiance correction factor database is the corresponding spectral radiance adjusted coefficient K of the face battle array EMCCD pixel row j (λ obtaining by high temperature blackbody _j) tables of data, spectral radiance nominal data storehouse is the corresponding standard spectrum spoke of the face battle array EMCCD pixel row j brightness L obtaining 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 is on display, to show that one group of function button, spectra collection choice menus, parameter arrange hurdle and display window; Function button comprises background testing button, light-pulse generator testing button, computed push-buttom; Spectra collection choice menus comprises single spectrum collection and two options of multispectral collection; Parameter arranges hurdle for inputting the pulsewidth parameter τ of measured pulse light source, and display window is for voltage tester curve and the spectral radiance curve of display background voltage tester curve, measured pulse light source;

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

Computing module function is: gather under option in single spectrum, in the time 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 that calculates measured pulse light source with next group formula _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 _cC0spectral radiance value while dispatching from the factory for white light source, 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, in the time receiving computed push-buttom instruction, call spectral radiance correction factor database, spectral radiance nominal data storehouse, repeatedly according to calculating the spectral radiance value L of measured pulse light source from period 1 number to the M periodicity with next group formula _m(λ _j), and show one by one the spectral radiance curve of measured pulse light source with wavelength variations 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: in the time of m=1, by j=1,2 ...., λ when J _jthe above-mentioned formula of substitution obtains first spectral radiance value L ₁(λ _j), in the time of m=2, by j=1,2 ...., λ when J _jthe above-mentioned formula of substitution obtains second spectral radiance value L ₂(λ _j), until when m=M, by j=1,2 ...., λ when J _jthe above-mentioned formula of substitution obtains 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 form light-pulse generator assembly, utilize the theoretical value of high temperature blackbody spectral radiance value, demarcation obtains face battle array EMCCD pixel in grating spectrograph and is listed as corresponding spectral radiance correction factor; Utilize white light source spectral radiance to export uniform feature, demarcation obtains face battle array EMCCD pixel in grating spectrograph and is listed as corresponding standard spectrum spoke brightness value; Utilize the characteristic wavelength of high-pressure sodium lamp to demarcate the pixel that obtains face battle array EMCCD in grating spectrograph and be listed as corresponding wavelength value, thereby solved the accurate calibration problem of the faint pulse spectrum spoke of near infrared brightness calibration device.

(2) the present invention is when to measured pulse light source calibration, tested light beam enters spectrograph slit by fibre bundle array, again by focusing on the photosurface of face battle array EMCCD after flat filed concave grating dispersion and forming the capable line spectrum with wavelength variations of n, the output signal of computing machine opposite battle array EMCCD carries out obtaining after respective handling 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, have realized thus the measurement of the faint spectral radiance of near infrared light-pulse generator.

(3) in the present invention, grating spectrograph has adopted flat filed concave grating, than plane blazed grating, flat filed concave grating integrates dispersion and focusing function, thereby make grating spectrograph save collimating mirror and focusing mirror, simplify light path, reduced by complex optical path and reflected the energy loss of bringing.Simultaneously because flat filed concave grating has aberration correction function, thereby guarantee that the defocusing amount of each line spectrum face of dispersed light beam imaging is zero, and then improved the measuring accuracy of spectral radiance of the present invention.

Accompanying drawing explanation

Fig. 1 is the faint pulse spectrum spoke of near infrared of the present invention brightness calibration installation 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 comprise light source assembly 1, optical fiber component 2, the grating spectrograph 3 that contains coupled lens 2-1 and array fibre bundle 2-2 and the computing machine 4 that spectral radiance calibration data processing software package is housed.

Light source assembly 1 comprises for the high temperature blackbody 1-1 of nominal light grating spectrograph 3, white light source 1-2, high-pressure sodium lamp 1-3, pulse switch 1-5, one-dimensional movement platform 1-6.High temperature blackbody 1-1 selects the black matrix that the colour temperature of Quan E physical study institute development is 2856K, its Main Function is the theoretical spectral spoke brightness value according to its radiation, and adopts face battle array EMCCD3-4 pixel in conventional method of testing acquisition grating spectrograph 3 to be listed as corresponding spectral radiance correction factor.White light source 1-2 adopts Energetiq company of U.S. product, model is EQ-99CAL, this white light source 1-2 is by Laser Driven, its spectral radiance output evenly, its Main Function is to adopt conventional scaling method, obtains face battle array EMCCD3-4 pixel in grating spectrograph 3 and is listed as corresponding standard spectrum spoke brightness value.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 that adopts conventional scaling method to obtain face battle array EMCCD3-4 in grating spectrograph 3 is listed as 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 light-emitting area upper and three and are all positioned at same plane and demarcate face.When the faint pulse spectrum spoke of near infrared brightness calibration device is carried out to timing signal, 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 one by one pulse switch 1-5 center by promoting one-dimensional movement platform 1-6, and in pulse switch 1-5 center and optical fiber component 2, coupled lens 2-1 center is just right.In the time that measured pulse light source 1-4 is calibrated, pulse switch 1-5 need be shifted out to light path, measured pulse light source 1-4 is placed on to one-dimensional movement platform 1-6 upper simultaneously, and makes the light-emitting area of this light-pulse generator 1-4 aim at coupled lens 2-1 center with the center of the coincidence of demarcation face and 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 AndorTechnology company of Britain.The input end of this array fibre bundle 2-2 is simple optical fiber, and it is 2.4mm by the length of the optical fiber of word order and output terminal that output terminal contains 19, and the core diameter of every optical fiber of output is 100 μ m, and numerical aperture is 0.22.Coupled lens 2-1 is connected with the input end of array fibre bundle 2-2 by the joints of optical fibre, 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 the length of slit 3-2 in grating spectrograph 3, is conventionally 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 μ m, error ± 1 μ m, 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 μ m～1.1 μ m, when 0.9 μ m, dispersive power is 8.3586nm/mm, when 1.0 μ m, dispersive power is 7.8797nm/mm, and when 1.1 μ m, dispersive power is 7.3103nm/mm.After this grating dispersion, focus on and form n line spectrum, so-called line spectrum refers to the spectrum face that in dispersed light beam, defocusing amount is zero, the width of each line spectrum is 25.3830mm(referring to Fig. 2), in line spectrum, the angle at the position of 0.9 mum wavelength and 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 ANDORTechnology company of Britain produces DU970P-BVF type EMCCD, is operated under the environment of-100 ℃ of refrigeration, and 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 adopted 19 × 1587 pixels, each pixel dimension is 16 μ m × 16 μ m.Slit 3-2 is positioned in the focus of flat filed concave grating 3-3, and face battle array EMCCD3-4 is towards dispersed light beam one 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 light source assembly 1 one of them light source sends or radiation are converted to pulsed light beam and pulsed light beam and are coupled to through coupled lens 2-1 the input end of array fibre bundle 2-2 through pulse switch 1-5, or the pulsed light beam that measured pulse light source 1-4 sends is directly coupled to the input end of array fibre bundle 2-2 through coupled lens 2-1, by a row light beam irradiates of array fibre bundle 2-2 output terminal outgoing to optical filter 3-1, after filtering, arrive slit 3-2, incided on flat filed concave grating 3-3 by the light beam of slit 3-2 outgoing; Light beam focuses on the photosurface of face battle array EMCCD3-4 and forms 19 line spectrum after flat filed concave grating 3-3 dispersion, and face battle array EMCCD3-4 sends into computing machine 4 after the line spectrum signal receiving is converted to electric signal.Wherein, the groove direction of flat filed concave grating 3-3 is horizontal direction (referring to 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 vertical with the length direction of slit 3-2 with array fibre bundle 2-2, simultaneously consistent with the length direction 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, Wavelength calibration database is the corresponding wavelength X of face battle array EMCCD pixel row j obtaining by high-pressure sodium lamp _jtables of data; Spectral radiance correction factor database is spectral radiance adjusted coefficient K (λ corresponding to face battle array EMCCD pixel row j obtaining by high temperature blackbody _j) tables of data, spectral radiance nominal data storehouse is standard spectrum spoke brightness LCC (λ corresponding to face battle array EMCCD pixel row j obtaining by white light source _j) tables of data.

Calibration software bag is prior art, after its function is the face battle array EMCCD output signal in the time that computing machine 4 collects take high temperature blackbody 1-1, white light source 1-2 or high-pressure sodium lamp 1-3 as input light or radiation, above-mentioned signal is processed accordingly, and the corresponding corresponding wavelength X of EMCCD pixel row j that obtains _jtables of data, spectral radiance adjusted coefficient K (λ corresponding to face battle array EMCCD pixel row j _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 and call when to measured pulse light source calibration.

Spectral radiance calibration data processing software package comprises menu module, acquisition module, computing module.The function of menu module is on graphoscope, to show that one group of function button, spectra collection choice menus, parameter arrange hurdle and display window.Function button comprises background testing button, light-pulse generator testing button, computed push-buttom.Spectra collection choice menus comprises single spectrum collection and two options of multispectral collection; Parameter arranges hurdle for inputting the pulsewidth parameter τ of measured pulse light source, and display window is for voltage tester curve and the spectral radiance curve of display background voltage tester curve, measured pulse light source.

The function of acquisition module is, under single spectrum collection option, in the time receiving the instruction of background testing button, to gather the background test signal V changing with pixel row j of an integration period output of face battle array EMCCD by data collecting card _bi(j), call Wavelength calibration database by background test signal V _bi(j) be converted to wavelength X _jthe background test signal V changing _bi(λ _j), and show with wavelength X in the display window of menu module _jthe background voltage test curve changing; In the time receiving the instruction of light-pulse generator testing button, gather the light-pulse generator test signal V changing with pixel row j of an integration period output of face battle array EMCCD by data collecting card _ci, and call Wavelength calibration database by light-pulse generator test signal V (j) _ci(j) be 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 changing.Wherein: i=1,2 ...., n, the pixel line number of imaging region in 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 of array fibre bundle output, and each row imaging is corresponding one by one with the output beam of the intrafascicular each optical fiber of array fibre; J depends on that light focuses on line spectrum width on face battle array EMCCD photosurface and the pixel dimension of 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 μ m, is 61.12 μ m at the half width FWHM of centre wavelength spectral line.λ _jrepresent and the corresponding wavelength value of pixel row j.Because 1587 pixels in pixel used in face battle array EMCCD row have covered the wavelength coverage of flat filed concave grating dispersion, each row are 0.126nm with the wavelength difference of its previous column, and the wavelength that first row is corresponding is 900nm, and the wavelength that secondary series is corresponding is

900nm+0.126nm last is listed as corresponding wavelength is 1100nm.

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

Computing module function is: gather under option in single spectrum, in the time receiving computed push-buttom instruction, call spectral radiance correction factor database and spectral radiance nominal data storehouse, and according to the spectral radiance value L (λ that calculates measured pulse light source with next group formula _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 ...., 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 _cC0spectral radiance value while dispatching from the factory for white light source 1-2; 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, in the time receiving computed push-buttom instruction, call spectral radiance correction factor database, spectral radiance nominal data storehouse, repeatedly according to calculating the spectral radiance value L of measured pulse light source from period 1 number to the M periodicity with next group formula _m(λ _j), and show one by one the spectral radiance curve of measured pulse light source with wavelength variations 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: in the time of m=1, by j=1,2 ...., the λ of 1587 o'clock _jthe above-mentioned formula of substitution obtains first spectral radiance value L ₁(λ _j), in the time of m=2, by j=1,2 ...., the λ of 1587 o'clock _jthe above-mentioned formula of substitution obtains second spectral radiance value L ₂(λ _j), until when m=M, by j=1,2 ...., the λ of 1587 o'clock _jthe above-mentioned formula of substitution obtains M spectral radiance value L _m(λ _j).

In the present embodiment, the using method of the faint pulse spectrum spoke of near infrared brightness calibration device is as follows:

1) measured pulse light source 1-4 is placed on to one-dimensional platform 1-6 above, pulse switch 1-5 is shifted out to light path, manually one-dimensional platform 1-6 moves into light path by measured pulse light source 1-4 and makes the center of its light-emitting area aim at coupled lens 2-1 center; 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, gathers in choice menus and select single spectrum to gather option at computer screen homepage polishing wax; 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 by showing with wavelength X in the display window of menu module after this signal of computer acquisition _jthe background voltage test curve changing; 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 showing the measured pulse light source voltage test curve with wavelength variations after this signal of computer acquisition; 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, gathers in choice menus and select multispectral collection option at computer screen homepage polishing wax; In arranging hurdle, the parameter of menu module inputs the pulsewidth parameter τ of measured pulse light source; 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 receive after be converted to electric signal, and by after this signal of computer acquisition in the display window of menu module by showing one by one with wavelength X from period 1 number to the M periodicity _jthe background voltage test curve changing; 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 demonstration from period 1 number to the M periodicity receives one by one with the measured pulse light source voltage test curve of wavelength variations; Click computed push-buttom on computer screen homepage, and shown one by one the spectral radiance curve with wavelength variations of measured pulse light source by computing machine by period 1 number to the M periodicity.

Claims (2)

1. the faint pulse spectrum spoke of a near infrared brightness calibration device, 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) that contains coupled lens (2-1) and array fibre bundle (2-2), described grating spectrograph (3) contains 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 high temperature blackbody (1-1), white light source (1-2), high-pressure sodium lamp (1-3) and the pulse switch (1-5) of nominal light grating spectrograph (3), 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 gone up and three's light-emitting area is all positioned at same plane and demarcates face; Timing signal, promote one-dimensional movement platform (1-6) and 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 one by one the center of pulse switch (1-5), the center of the center of pulse switch (1-5) and described coupled lens (2-1) is 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 n root by the optical fiber of word order, n >=10, and the value of n depends on the length of described slit (3-2); Coupled lens (2-1) is connected with the input end of array fibre bundle (2-2) by the joints of optical fibre; 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 vertical with the length direction of slit (3-2) with array fibre bundle (2-2), simultaneously consistent with the length direction of face battle array EMCCD (3-4);

In the time that measured pulse light source (1-4) is calibrated, measured pulse light source (1-4) is placed on to one-dimensional movement platform (1-6) upper, its light-emitting area is aimed at the center of coupled lens (2-1) with the center of described demarcation face coincidence and 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 irradiates of array fibre bundle (2-2) output terminal outgoing to optical filter (3-1), after filtering, arrive slit (3-2), incided on flat filed concave grating (3-3) by the light beam of slit (3-2) outgoing; Light beam focuses on the photosurface of face battle array EMCCD (3-4) and forms n line spectrum after flat filed concave grating (3-3) dispersion, and face battle array EMCCD (3-4) sends into computing machine (4) after the line spectrum signal receiving 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, and the face battle array EMCCD pixel row j corresponding wavelength X of Wavelength calibration database for obtaining by high-pressure sodium lamp (1-3) _jtables of data; The face battle array EMCCD pixel row j corresponding spectral radiance adjusted coefficient K (λ of spectral radiance correction factor database for obtaining by high temperature blackbody (1-1) _j) tables of data, the face battle array EMCCD pixel row j corresponding standard spectrum spoke brightness L of spectral radiance nominal data storehouse for obtaining 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 is on graphoscope, to show that one group of function button, spectra collection choice menus, parameter arrange hurdle and display window; Function button comprises background testing button, light-pulse generator testing button, computed push-buttom; Spectra collection choice menus comprises single spectrum collection and two options of multispectral collection; Parameter arranges hurdle for inputting the pulsewidth parameter τ of measured pulse light source, and display window is for voltage tester curve and the spectral radiance curve of display background voltage tester curve, measured pulse light source;

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

Computing module function is: gather under option in single spectrum, in the time 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 that calculates measured pulse light source with next group formula _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 _cC0spectral radiance value while dispatching from the factory for white light source, 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, in the time receiving computed push-buttom instruction, call spectral radiance correction factor database, spectral radiance nominal data storehouse, repeatedly according to calculating the spectral radiance value L of measured pulse light source from period 1 number to the M periodicity with next group formula _m(λ _j), and show one by one the spectral radiance curve of measured pulse light source with wavelength variations 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: in the time of m=1, by j=1,2 ...., λ when J _jthe above-mentioned formula of substitution obtains first spectral radiance value L ₁(λ _j), in the time of m=2, by j=1,2 ...., λ when J _jthe above-mentioned formula of substitution obtains second spectral radiance value L ₂(λ _j), until when m=M, by j=1,2 ...., λ when J _jthe above-mentioned formula of substitution obtains M spectral radiance value L _m(λ _j).

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

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