CN205280211U - Absolute spectral responsivity measuring device of long wave infrared photoelectric detector - Google Patents
Absolute spectral responsivity measuring device of long wave infrared photoelectric detector Download PDFInfo
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- CN205280211U CN205280211U CN201521088105.3U CN201521088105U CN205280211U CN 205280211 U CN205280211 U CN 205280211U CN 201521088105 U CN201521088105 U CN 201521088105U CN 205280211 U CN205280211 U CN 205280211U
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Abstract
The utility model provides an absolute spectral responsivity measuring device of long wave infrared photoelectric detector, include: long wave infrared laser source, brewster window, vacuum bellows, high vacuum slide valve, low -temperature radiometer and the standard detector of long wave infrared transmission, the long wave infrared laser source includes: carbon dioxide gas laser instrument, [feedback] controller, helium neon laser, the vacuum bellows passes through the flange and links to each other with brewster window and high vacuum slide valve respectively, the high vacuum slide valve passes through the flange and links to each other with vacuum bellows and low -temperature radiometer respectively, long wave infrared laser entry advances the standard detector of long wave infrared transmission, measures response voltage. The utility model discloses an accurate of long wave infrared wave band brewster window angle is adjusted, has improved the measurement accuracy of brewster window transmissivity, has improved the quantity transmission precision of absolute spectral responsivity parameter.
Description
Technical field
This utility model relates to technical field of measurement and test, particularly to a kind of LONG WAVE INFRARED photodetector absolute spectral response measurement apparatus.
Background technology
The absolute spectral response of photodetector refers to response voltage and the ratio of incident luminous power of detector, is:
R=V/P
Wherein, R is photodetector absolute spectral response, and V is photodetector response voltage, and P incides the luminous power on photodetector. Therefore, if the response voltage V of precise measuring electric explorer and incident optical power P, it is possible to calculate the absolute spectral response R of photodetector.
At present, the measurement of voltage has significantly high precision, and the certainty of measurement of photodetector absolute spectral response depends primarily on the measurement of luminous power.
Low temperature radiometer is the measurement criteria of measuring light power field full accuracy in the world at present. Low temperature radiometer adopts low temperature, vacuum and superconductor technology, and by fully equivalent for measuring light power for electric power measurement, and the measurement of electrical power can reach significantly high certainty of measurement.
At present, domestic and international research institution utilizes the low temperature radiometer measurement technology relative maturity to visible ray, near infrared band (400nm��1100nm) photodetector absolute spectral response, and certainty of measurement can reach 0.01%. Long wave infrared region (8 ��m��14 ��m) is an extremely special electromagnetic radiation wave band, both correspond to the electromagnetic radiation wave band of all room temperature target objects of earth surface, again just at the air weak absorbing spectral band being referred to as " atmospheric window ".
Long wave infrared region photodetector guides at precision weapons, there is very important application in the fields such as early warning, earth resource detection, meteorology of scouting. But, owing to long wave infrared region and visible ray, near infrared band are apart from each other, human eye is invisible, and detection means is deficient, and domestic and international research institution is all generally relatively low for the certainty of measurement of long wave infrared region photodetector absolute spectral response.
At present, the measuring method of LONG WAVE INFRARED photodetector absolute spectral response is mainly:
(1), before LONG WAVE INFRARED Transfer Standards detector being placed in low temperature radiometer, LONG WAVE INFRARED laser light incident, to Transfer Standards detector photosurface, measures explorer response voltage;
(2) being removed by Transfer Standards detector, LONG WAVE INFRARED laser light incident enters low temperature radiometer, accurate Laser Measurement luminous power;
(3), after the absolute spectral response parameter precise calibration of Transfer Standards detector, utilize Transfer Standards detector, the absolute spectral response parameter of the Long Wave Infrared Probe of other unit censorship is calibrated and measures.
What present stage measuring method existed major problem is that:
(1) the high-selenium corn chamber of low temperature radiometer is arranged in the low temperature of sealing, vacuum environment, and low temperature radiometer front end exists a window, and laser enters to inject low temperature radiometer cavity from window. The transmitance of window is entered in order to improve laser light incident, the polarization direction according to laser, the angle of inclination of window is designed as Brewster's angle. In theory, line polarized light is with brewster angle incidence to window, and laser should all through window, it does not have reflection light. Owing to the polarization of laser is incomplete and the deviation of window angle in experiment, often there is very weak reflection light. At visible ray Conventional band (400nm��700nm), this reflection light employment can be observed and observe. Before low temperature radiometer measures luminous power, it is necessary to by window angular adjustment to Brewster's angle, reflect light by eye-observation, reflection light is adjusted to the most weak. It addition, after measuring light power completes by low temperature radiometer, it is necessary to accurately measure the transmitance of Brewster window. Owing to now window is connected with low temperature radiometer cavity, it is thus desirable to Brewster window is pulled down from low temperature radiometer, move to low temperature radiometer certain position to fix, weak according to eye-observation reflective light intensity, window angle is restored, use photodetector that the luminous power before window, after window is measured, calculate the transmitance of window. Different from visible ray Conventional band, for long wave infrared region laser, human eye is invisible, and the reflection light of Brewster window not easily observes detection. Therefore, in long wave infrared region, before low temperature radiometer measures luminous power, the placed angle of Brewster window is difficult to determine; After low temperature radiometer measurement luminous power completes, Brewster window Transmissivity measurement there is also difficulty.
(2) LONG WAVE INFRARED Transfer Standards detector generally adopts HgGdTe photodetector. At present, HgGdTe detector ubiquity responds the feature that area is less, spatially uniform is poor, introduces measurement error in transmission of quantity value process.
Utility model content
For solving above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of LONG WAVE INFRARED photodetector absolute spectral response measurement apparatus, this measurement apparatus is by using visible light wave range He-Ne Lasers (633nm) as the direct light of LONG WAVE INFRARED laser, it is achieved that the accurate adjustment of long wave infrared region Brewster window angle; By individually being fixed by Brewster window, and between Brewster window and low temperature radiometer cavity, increase vacuum corrugated pipe, improve the certainty of measurement of Brewster window transmitance; By designing brand-new LONG WAVE INFRARED Transfer Standards detector, improve the transmission of quantity value precision of absolute spectral response parameter; This measurement apparatus is greatly improved the certainty of measurement of LONG WAVE INFRARED photodetector absolute spectral response.
The technical solution of the utility model is achieved in that
A kind of LONG WAVE INFRARED photodetector absolute spectral response measurement apparatus, including: LONG WAVE INFRARED lasing light emitter 100, Brewster window 200, vacuum corrugated pipe 300, fine vacuum slide valve 400, low temperature radiometer 500 and LONG WAVE INFRARED Transfer Standards detector 600;
Described LONG WAVE INFRARED lasing light emitter 100 includes: carbon dioxide gas laser 101, and the Output of laser of carbon dioxide gas laser 101 is regulated by feedback controller 102; The visible ray that wavelength is 633nm of helium neon laser 103 output is as the direct light of LONG WAVE INFRARED laser;
Described vacuum corrugated pipe 300 is connected with Brewster window 200 and fine vacuum slide valve 400 respectively by flange;
Described fine vacuum slide valve 400 is connected with vacuum corrugated pipe 300 and low temperature radiometer 500 respectively by flange;
Low temperature radiometer 500 measures the luminous power of LONG WAVE INFRARED laser;
LONG WAVE INFRARED laser light incident enters LONG WAVE INFRARED Transfer Standards detector 600, measures response voltage.
Alternatively, described Brewster window 200 is provided with ZnSe material windows 201, window angle adjustment knob 202, vacuum-pumping valve 203, flange 204 and securing bracket 205, and described securing bracket 205 is fixed on optical table.
Alternatively, described vacuum corrugated pipe 300 is provided with flange 301,302 and securing bracket 303, adopts securing bracket 303 that vacuum corrugated pipe 300 is carried out rigidity clamping.
Alternatively, described fine vacuum slide valve 400 is provided with flange 401,402 and switching knob 403.
Alternatively, described low temperature radiometer 500 comprises flange 501, high-selenium corn chamber 502 and vacuum-pumping valve 503.
Alternatively, described LONG WAVE INFRARED Transfer Standards detector 600 includes integrating sphere 601 and HgCdTe detector 602.
The beneficial effects of the utility model are:
(1) this utility model introduces visible light wave range He-Ne Lasers (633nm), visible light wave range laser and long wave infrared region are adjusted to complete conllinear, visible light wave range laser can serve as the direct light of LONG WAVE INFRARED laser, it is achieved that the accurate adjustment of long wave infrared region Brewster window angle;
(2) this utility model is by individually fixing Brewster window, and increases vacuum corrugated pipe between Brewster window and low temperature radiometer cavity, is separated with cavity by window, improves the certainty of measurement of Brewster window transmitance;
(3) this utility model by introducing integrating sphere before HgCdTe detector, using the combination of integrating sphere and HgCdTe detector as LONG WAVE INFRARED Transfer Standards detector, improves the transmission of quantity value precision of absolute spectral response parameter.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of this utility model a kind of LONG WAVE INFRARED photodetector absolute spectral response measurement apparatus.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole embodiments. Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection.
As shown in Figure 1, the utility model proposes a kind of LONG WAVE INFRARED photodetector absolute spectral response measurement apparatus, specifically include that LONG WAVE INFRARED lasing light emitter 100, Brewster window 200, vacuum corrugated pipe 300, fine vacuum slide valve 400, low temperature radiometer 500 and LONG WAVE INFRARED Transfer Standards detector 600.
Described LONG WAVE INFRARED lasing light emitter 100 includes: carbon dioxide gas laser 101, and the Output of laser of carbon dioxide gas laser 101 is regulated by feedback controller 102, improves the optical power stability of laser; The visible ray that wavelength is 633nm of helium neon laser 103 output is as the direct light of LONG WAVE INFRARED laser.
Described Brewster window 200 is provided with ZnSe material windows 201, window angle adjustment knob 202, vacuum-pumping valve 203, flange 204 and securing bracket 205. ZnSe material is applicable to long wave infrared region. The Brewster's angle design of ZnSe material is entered according to long wave infrared region laser light incident in the angle of inclination of Brewster window 200. Brewster window 200 is provided with vernier knob 202, it is possible to angle of inclination is finely tuned. Brewster window is provided with securing bracket 205, it is possible to be individually fixed on optical table.
Described vacuum corrugated pipe 300 is connected with Brewster window 200 and fine vacuum slide valve 400 respectively by flange, it is achieved being flexible coupling therebetween. Described vacuum corrugated pipe 300 is provided with flange 301,302 and securing bracket 303. Owing to vacuum corrugated pipe material is softer, adopt securing bracket 303 that vacuum corrugated pipe is carried out rigidity clamping.
Described fine vacuum slide valve 400 is connected with vacuum corrugated pipe 300 and low temperature radiometer 500 respectively by flange, close fine vacuum slide valve 400, the isolation of Brewster window 200 and low temperature radiometer 500 can be realized, when measuring Brewster window 200 transmitance, still ensure that the high vacuum state of low temperature radiometer.
Described fine vacuum slide valve 400 is provided with flange 401,402 and switching knob 403.
Described low temperature radiometer 500 adopts low temperature, vacuum and superconductor technology, by fully equivalent for measuring light power for electric power measurement, can accurately measure the luminous power of incident laser. Described low temperature radiometer 500 mainly comprises flange 501, high-selenium corn chamber 502 and vacuum-pumping valve 503.
Before low temperature radiometer 500 measures luminous power, Brewster window 200 is fixed on optical table by securing bracket 205, being connected with the flange 301 of vacuum corrugated pipe by the flange 204 of Brewster window, vacuum corrugated pipe 300 is fixed on optical table by securing bracket 303. The flange 302 of vacuum corrugated pipe is connected with the flange 401 of fine vacuum slide valve, and the flange 402 of fine vacuum slide valve is connected with the flange 501 of low temperature radiometer.
Then, vacuum pump is used to carry out evacuation process respectively through vacuum-pumping valve 203 and vacuum-pumping valve 503.
After the preparation such as evacuation, refrigeration completes, the visible ray that wavelength is 633nm that helium neon laser 103 is exported and LONG WAVE INFRARED Laser Modulation conllinear, use visible ray as direct light, poor with the Brewster angle that LONG WAVE INFRARED laser light incident enters ZnSe material windows 201 by calculating visible ray, the angle of Brewster window is regulated by window angle adjustment knob 202.
LONG WAVE INFRARED laser light incident is entered LONG WAVE INFRARED Transfer Standards detector 600, measures response voltage.
Then, low temperature radiometer 500 is used to measure the luminous power of LONG WAVE INFRARED laser.
After low temperature radiometer 500 measures luminous power, rotary switch knob 403, close the connection between vacuum corrugated pipe 300 and low temperature radiometer 500, allow low temperature radiometer keep vacuum state. Release flange 204 and flange 301, flange 302 and the connection of flange 401, vacuum corrugated pipe 300 is removed from original position. Owing to Brewster window is individually fixed on optical table by securing bracket 205, therefore the position of Brewster window and angle can remain unchanged. Now, the luminous power before using photodetector measurement window respectively, after window, reduce the error that window in traditional method is removed, window recovery introduces, be greatly improved the certainty of measurement of the transmitance of window.
LONG WAVE INFRARED Transfer Standards detector 600 mainly includes integrating sphere 601 and HgCdTe detector 602, and the introducing of integrating sphere 601 can improve the spatially uniform of whole standard transmission explorer response, increases effective photosurface of standard detector.
Compared with prior art, Brewster window is separated by this utility model with low temperature radiometer, uses vacuum corrugated pipe to connect, be individually fixed on optical table by Brewster window in the middle of the two; Before low temperature radiometer measures luminous power, use visible light wave range He-Ne Lasers as the direct light of LONG WAVE INFRARED laser, restrainting laser by two and be adjusted to conllinear, the reflective light intensity that eye-observation visible ray incides Brewster window is weak, regulates the window Brewster's angle to visible ray incidence; Calculate visible ray with LONG WAVE INFRARED laser light incident to the differential seat angle of the Brewster's angle of ZnSe window, rotate this differential seat angle, it is possible to window is adjusted to Brewster's angle; When measuring Brewster window transmitance, fine vacuum slide valve cuts out, vacuum corrugated pipe is removed, individually it is fixed on optical table due to Brewster window, therefore without window angle is restored, can directly use photodetector that the luminous power before window, after window is measured, reduce window angle and restore the error introduced, be greatly improved the certainty of measurement of the transmitance of window; Additionally, the utility model proposes the combination of integrating sphere and HgCdTe detector as LONG WAVE INFRARED Transfer Standards detector, the introducing of integrating sphere can improve the spatially uniform of whole standard transmission explorer response, increasing effective photosurface of standard detector, the design of this Transfer Standards detector will improve the transmission of quantity value precision of absolute spectral response.
The foregoing is only preferred embodiment of the present utility model; not in order to limit this utility model; all within spirit of the present utility model and principle, any amendment of making, equivalent replacement, improvement etc., should be included within protection domain of the present utility model.
Claims (6)
1. a LONG WAVE INFRARED photodetector absolute spectral response measurement apparatus, it is characterized in that, including: LONG WAVE INFRARED lasing light emitter (100), Brewster window (200), vacuum corrugated pipe (300), fine vacuum slide valve (400), low temperature radiometer (500) and LONG WAVE INFRARED Transfer Standards detector (600);
Described LONG WAVE INFRARED lasing light emitter (100) including: carbon dioxide gas laser (101), and the Output of laser of carbon dioxide gas laser (101) is regulated by feedback controller (102); The visible ray that wavelength is 633nm that helium neon laser (103) exports is as the direct light of LONG WAVE INFRARED laser;
Described vacuum corrugated pipe (300) is connected with Brewster window (200) and fine vacuum slide valve (400) respectively by flange;
Described fine vacuum slide valve (400) is connected with vacuum corrugated pipe (300) and low temperature radiometer (500) respectively by flange;
Low temperature radiometer (500) measures the luminous power of LONG WAVE INFRARED laser;
LONG WAVE INFRARED laser light incident enters LONG WAVE INFRARED Transfer Standards detector (600), measures response voltage.
2. LONG WAVE INFRARED photodetector absolute spectral response measurement apparatus as claimed in claim 1, it is characterized in that, described Brewster window (200) is provided with ZnSe material windows (201), window angle adjustment knob (202), vacuum-pumping valve (203), flange (204) and securing bracket (205), and described securing bracket (205) is fixed on optical table.
3. LONG WAVE INFRARED photodetector absolute spectral response measurement apparatus as claimed in claim 1, it is characterized in that, described vacuum corrugated pipe (300) is provided with flange (301,302) and securing bracket (303), adopts securing bracket (303) that vacuum corrugated pipe (300) is carried out rigidity clamping.
4. LONG WAVE INFRARED photodetector absolute spectral response measurement apparatus as claimed in claim 1, it is characterised in that described fine vacuum slide valve (400) is provided with flange (401,402) and switching knob (403).
5. LONG WAVE INFRARED photodetector absolute spectral response measurement apparatus as claimed in claim 1, it is characterized in that, described low temperature radiometer (500) comprises flange (501), high-selenium corn chamber (502) and vacuum-pumping valve (503).
6. LONG WAVE INFRARED photodetector absolute spectral response measurement apparatus as claimed in claim 1, it is characterized in that, described LONG WAVE INFRARED Transfer Standards detector (600) includes integrating sphere (601) and HgCdTe detector (602).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521088105.3U CN205280211U (en) | 2015-12-24 | 2015-12-24 | Absolute spectral responsivity measuring device of long wave infrared photoelectric detector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521088105.3U CN205280211U (en) | 2015-12-24 | 2015-12-24 | Absolute spectral responsivity measuring device of long wave infrared photoelectric detector |
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| CN205280211U true CN205280211U (en) | 2016-06-01 |
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| CN201521088105.3U Expired - Fee Related CN205280211U (en) | 2015-12-24 | 2015-12-24 | Absolute spectral responsivity measuring device of long wave infrared photoelectric detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109579982A (en) * | 2018-11-15 | 2019-04-05 | 中国电子科技集团公司第四十研究所 | A kind of Brewster window, Brewster window angle computation method and adjusting method |
| CN113687507A (en) * | 2021-08-27 | 2021-11-23 | 西安应用光学研究所 | Ultrahigh vacuum light path switching mechanism applied to optical calibration device |
-
2015
- 2015-12-24 CN CN201521088105.3U patent/CN205280211U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109579982A (en) * | 2018-11-15 | 2019-04-05 | 中国电子科技集团公司第四十研究所 | A kind of Brewster window, Brewster window angle computation method and adjusting method |
| CN113687507A (en) * | 2021-08-27 | 2021-11-23 | 西安应用光学研究所 | Ultrahigh vacuum light path switching mechanism applied to optical calibration device |
| CN113687507B (en) * | 2021-08-27 | 2023-10-31 | 西安应用光学研究所 | Ultrahigh vacuum optical path switching mechanism applied to optical calibration device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160601 Termination date: 20181224 |
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| CF01 | Termination of patent right due to non-payment of annual fee |