CN102539120A - Measuring method for spectral reflectance of off-axis R-C system - Google Patents
Measuring method for spectral reflectance of off-axis R-C system Download PDFInfo
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- CN102539120A CN102539120A CN2012100010841A CN201210001084A CN102539120A CN 102539120 A CN102539120 A CN 102539120A CN 2012100010841 A CN2012100010841 A CN 2012100010841A CN 201210001084 A CN201210001084 A CN 201210001084A CN 102539120 A CN102539120 A CN 102539120A
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- axle
- integrating sphere
- pointolite
- lens
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Abstract
The invention discloses a measuring method for a spectral reflectance of an off-axis R-C system, which is realized based on a measuring optical system. The system includes a xenon lamp, a lens, a to-be-measured R-C system, an auxiliary plane mirror, an integrating sphere, a spectrometer and a computer. The method includes the following steps: firstly, adjusting parts in the measuring optical system to the required positions of a first measuring optical path, enabling the light emitted from the xenon lamp to pass through the lens, the to-be-measured R-C system and the auxiliary plane mirror and then return to the to-be-measured R-C system and the integrating sphere, and controlling the spectrometer by the computer to detect the spectral irradiance at the outlet of the integrating sphere; secondly, adjusting the parts to the required positions of a second measuring optical path, enabling the light emitted from the xenon lamp and passing through the lens and the auxiliary plane mirror to go into the integrating sphere, and controlling the spectrometer by the computer to detect the spectral irradiance at the outlet of the integrating sphere; and finally, comparing and rooting the two obtained spectral irradiance, so as to obtain the spectral reflectance of the to-be-measured R-C system. The measuring method has the advantages that the surface of the optical element to be measured is bigger, the measuring procedure is reduced, and the measuring precision is high.
Description
Technical field
The present invention relates to a kind of measuring method that is used for from axle R-C system spectrum reflectivity,, belong to remote sensor spectral radiometric calibration system parameter calibration technical field applicable to measuring with the spectral reflectivity of heavy caliber collimating optical system at the rail spectral radiometric calibration system.
Background technology
In rail radiation calibration process, is commonly used collimating optical system of for calibration providing collimated telescope one of from axle R-C system at remote sensor.Because optical system is in the space environment of irradiation, high low temperature, optical system parameter is affected by environment and change, and finally influences the remote sensor calibration precision.Wherein, be one of major parameter that influences calibration precision from axle R-C system spectrum reflectivity.Therefore, carry out from the measurement of axle R-C system spectrum reflectivity significant.
At present, the comparison method is generally adopted in the measurement of optical system spectral reflectivity, promptly through measuring a branch of light through tested optical system and the ratio of measuring without the spectral radiance of tested optical system.For collimating optical system, following method is adopted in the measurement of its spectral reflectivity usually: at first, utilize spectrometer to demarcate the spectral characteristics of radiation of the very little source of parallel light of a branch of bore; Then, good source of parallel light incides tested colimated light system to utilize this demarcation, utilizes the spectrometer measurement source of parallel light through the radiation characteristic behind the colimated light system simultaneously; At last, source of parallel light is compared through colimated light system with without the light beam radiation characteristic of colimated light system, obtain the spectral reflectivity of collimating optical system.For example, America NI ST just utilizes the source of parallel light of bore for 1cm, is that the low-temp radiating meter optical system of 7cm is calibrated (international optics proceeding SPIE the 4028th volume (2000): 404-410) to bore.The shortcoming of this method is: because standard source of parallel light relative aperture system under test (SUT) bore is little a lot, under the situation that especially the system under test (SUT) bore is very big, the result that this method is measured can only reflect the spectral reflectivity of very little a part of system under test (SUT) optical surface.Through increasing the bore of standard source of parallel light, can increase the tested area of system under test (SUT) optical element surface, but the radiation characteristic of heavy caliber source of parallel light inconvenience demarcation needs to introduce auxiliary optics usually it is demarcated.Therefore, at first need calibrate, increase measurement intermediate link like this, influence measuring accuracy the spectral characteristic parameter of backup system.The present invention is directed to this and proposed an a kind of measuring method that is used for from axle R-C system spectrum reflectivity, this method is based on a kind ofly measures that optical system realizes; This optical system is based on colimated light system the collimation principle and the light path principle of reversibility of pointolite is designed, and light channel structure is compact; The measuring method test link that is realized based on this measuring optical system is few, can carry out high-precision measurement to large-caliber off-axis R-C collimating optical system spectral reflectivity.
Summary of the invention
Technology of the present invention is dealt with problems and is: a kind of measuring method that is used for from axle R-C system spectrum reflectivity is provided; The small-bore source of parallel light that extensively adopts is at present demarcated the method for heavy caliber collimating optical system spectral reflectivity can only demarcate the spectral reflectivity of the very little part of colimated light system optical element surface; And need demarcate the radiation characteristic of small-bore source of parallel light before measuring; Increase intermediate link, influenced measuring accuracy.
A kind of measuring method that is used for from axle R-C system spectrum reflectivity; Its technical solution: this method is based on a kind ofly measures that optical system realizes; This measurement optical system comprises xenon lamp (1), adjustable diaphragm (2), lens (3), tested from axle R-C system, auxiliary plane mirror (6), integrating sphere (7), spectrometer (8) and computing machine (9); The wherein said tested axle R-C system that leaves is made up of secondary mirror (4) and primary mirror (5), and this method comprises the steps:
Step 1, the position formation first measurement light path: the two times of focal length places of object space that the pointolite of xenon lamp (1) and adjustable diaphragm (2) formation placed lens (3) through adjusting each optical device in the measurement optical system; The picture point that pointolite forms through lens (3) drops on tested on the object space focal plane of axle R-C system, makes to become directional light through the emergent ray after axle R-C system; Auxiliary plane mirror (6) places from axle R-C system primary mirror (5) dead ahead and vertical with optical axis; To all reflect back into system along direction from the directional light of axle R-C system outgoing from axle R-C with symmetrical; The directional light of reflected back is through making the pointolite secondary imaging to the focal plane of this system from axle R-C system post-concentration, the position of pointolite secondary imaging becomes symmetrical with Polaroid position; The receipts light mouth of integrating sphere (7) places the secondary imaging position of pointolite, makes convergent beam all get into integrating sphere (7), and be E through the spectral irradiance that computing machine (9) control spectrometer (8) detects integrating sphere (7) exit this moment
1(λ);
Principle of the present invention is: this measuring method is to utilize the comparison ratio juris; Promptly through measuring a branch of light through tested optical system and the measurement that realizes the system under test (SUT) spectral reflectivity without the ratio of the spectral radiance tolerance of tested optical system, it is as shown in Figure 1 to measure flow process; It measures optical system is to utilize collimation principle and the light path principle of reversibility of colimated light system to pointolite; As shown in Figure 2; For from an axle R-C system, the c place in the position is incided from a R-C system with the parallel beam of the parallel beam of optical system+θ ° of visual field and-θ ° visual field; Under the converging action of this system, two parallel beams are with 2 the position a and the position b that converge at respectively on axle R-C system focal plane.If a pointolite is placed at a place in the position, the light that pointolite sends is through the parallel beam from axle R-C system collimating effect formation+θ ° visual field; This moment, an auxiliary plane mirror was placed at the c place in the position; And the auxiliary plane mirror is with vertical from axle R-C systematic optical axis, and pointolite will converge at b place, position through the directional light that forms from axle R-C system along the directional light light path of above-mentioned-θ ° visual field through the auxiliary plane mirror reflection.
The present invention's advantage compared with prior art is: can realize the measurement of heavy caliber collimating optical system spectral reflectivity, need not demarcate the spectral characteristics of radiation of light source before the measurement that measuring method is simple, the measurement light path is compact, measuring accuracy is higher.
Description of drawings
Fig. 1 is a measurement process flow diagram of the present invention;
Fig. 2 is measuring principle figure of the present invention
Fig. 3 a measures optical system first according to the spectral reflectivity that the present invention implements to measure the light path synoptic diagram;
Fig. 3 b measures optical system second according to the spectral reflectivity that the present invention implements to measure the light path synoptic diagram.
Concrete label is following among the figure:
1, xenon lamp 2, adjustable diaphragm 3, lens
4, tested from axle R-C system secondary mirror 5, tested from axle R-C system primary mirror 6, auxiliary plane mirror
7, integrating sphere 8, spectrometer 9, computing machine
P
1The parallel beam P of ,+θ ° visual field
2The parallel beam of ,-θ ° visual field
L1: the horizontal range at primary mirror 5 and secondary mirror 4 centers
L2: the horizontal range at secondary mirror 4 and auxiliary plane mirror 6 centers
L3: the vertical distance at secondary mirror 4 and auxiliary plane mirror 6 centers
L4: secondary mirror 4 centers are to the horizontal range of R-C system focal plane
L5: pointolite is through the picture point of lens 3 and the vertical distance at primary mirror 5 centers
L6: pointolite through the picture point of lens 3 and the vertical distance of the final convergent point of light beam
α: the angle that the optical axis of lens 3 is become with horizontal direction
L7: the distance between adjustable diaphragm 2 centers and lens 3 centers
L8: the distance at lens 3 centers and auxiliary plane mirror 6 centers
β: the angle of auxiliary plane mirror 6 and vertical direction
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is done further explanation.
Embodiment: shown in Fig. 3 a, 3b; A kind of measuring method that is used for from axle R-C system spectrum reflectivity; This method is based on a kind ofly measures that optical system realizes; This measurement optical system comprises xenon lamp (1), adjustable diaphragm (2), lens (3), tested from axle R-C system, auxiliary plane mirror (6), integrating sphere (7), spectrometer (8) and computing machine (9), and the wherein said tested axle R-C system that leaves is made up of secondary mirror (4) and primary mirror (5).Wherein, to select effective clear aperture for use be that Φ 80mm, focal length are the cemented doublet of 1000mm to lens (3); Tested effective clear aperture from axle R-C system is that 1320mm, focal length are 11172mm, and its structural parameters are as shown in table 1; Auxiliary plane mirror (6) is a level crossing that bore is 480mm; The measure spectrum scope of spectrometer (8) is 350nm～2500nm, and it is measured repeatable accuracy and is superior to 2%.
Measure light path according to first shown in Fig. 3 a, debug measuring light path.The relative position relation of each optical element is as shown in table 2 in this light path.The light that the pointolite that xenon lamp (1) and adjustable diaphragm (2) constitute sends incides the system from axle R-C behind lens (3), be collimated into bore and be 454mm, from the horizontal by the parallel beam of 1 ° of angle; Before this parallel beam, placing bore is the auxiliary plane mirror (6) of 480mm; And primary mirror (5) minute surface center and auxiliary plane mirror (6) minute surface center height such as grade; Level crossing is reflected into parallel beam from the horizontal by the parallel beam of-1 ° of angle; And all incide primary mirror (5), the position of adjustment integrating sphere (7) makes all light through behind axle R-C systematic reflection, all getting into integrating sphere (7); The exit of integrating sphere (7) connects spectrometer (8), and be E through the spectral irradiance that computing machine (9) control spectrometer (8) detects integrating sphere (7) exit this moment
1(λ).
Measure light path according to second shown in Fig. 3 b, debug measuring light path.The relative position relation of each optical element is as shown in table 3 in this light path.The light of scioptics (3) incides auxiliary plane mirror (6); The position of adjustment integrating sphere (7); Make the reflected light of auxiliary plane mirror (6) all get into integrating sphere (7); The exit of integrating sphere (7) connects spectrometer (8), and be E through the spectral irradiance that computing machine (9) control spectrometer (8) detects integrating sphere (7) exit this moment
2(λ).
According to comparison method principle, tested spectral reflectivity
from axle R-C system (10)
Table 1 is from axle R-C system optics structural parameters
Table 2 first is measured each optical element relative position of light path
| L1/mm | L2/mm | L3/mm | L4/mm | L5/mm | L6/mm | α/degree | |
| Data | 3421.98 | 982.98 | 938.35 | 3589.32 | 1594.69 | 388.72 | 8.9 |
Table 3 second is measured each optical element relative position of light path
| ?L7/mm | L8/mm | β/degree | |
| Data | ?1000 | 2000 | ?5 |
The foregoing description is that foregoing of the present invention is further described, but should this scope that is interpreted as the above-mentioned theme of the present invention only not limited to the foregoing description.All technology that realizes based on foregoing all belong to scope of the present invention.
The content of not doing in the instructions of the present invention to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (1)
1. one kind is used for from a measuring method of R-C system spectrum reflectivity; This method is based on a kind ofly measures that optical system realizes; This measurement optical system comprises xenon lamp (1), adjustable diaphragm (2), lens (3), tested from axle R-C system, auxiliary plane mirror (6), integrating sphere (7), spectrometer (8) and computing machine (9); The wherein said tested axle R-C system that leaves is made up of secondary mirror (4) and primary mirror (5), and this method comprises the steps:
Step 1, the position formation first measurement light path: the two times of focal length places of object space that the pointolite of xenon lamp (1) and adjustable diaphragm (2) formation placed lens (3) through adjusting each optical device in the measurement optical system; The picture point that pointolite forms through lens (3) drops on tested on the object space focal plane of axle R-C system, makes to become directional light through the emergent ray after axle R-C system; Auxiliary plane mirror (6) places from axle R-C system primary mirror (5) dead ahead and vertical with optical axis; To all reflect back into system along direction from the directional light of axle R-C system outgoing from axle R-C with symmetrical; The directional light of reflected back is through making the pointolite secondary imaging to the focal plane of this system from axle R-C system post-concentration, the position of pointolite secondary imaging becomes symmetrical with Polaroid position; The receipts light mouth of integrating sphere (7) places the secondary imaging position of pointolite, makes convergent beam all get into integrating sphere (7), and be E through the spectral irradiance that computing machine (9) control spectrometer (8) detects integrating sphere (7) exit this moment
1(λ);
Step 2, the position formation second measurement light path: the two times of focal length places of object space that the pointolite of xenon lamp (1) and adjustable diaphragm (2) formation still placed lens (3) through adjusting each optical device in the measurement optical system; Auxiliary plane mirror (6) places lens (3) as in the two times of focal lengths in side; The receipts light mouth of integrating sphere (7) places the Polaroid position of pointolite; Make the convergent beam of scioptics (3) all get into integrating sphere (7), be E through the spectral irradiance that computing machine (9) control spectrometer (8) detects integrating sphere (7) exit this moment
2(λ);
Step 3, obtain the tested spectral reflectivity that constitutes by secondary mirror (4) and primary mirror (5) from axle R-C system:
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| CN201210001084.1A CN102539120B (en) | 2012-01-04 | 2012-01-04 | Measuring method for spectral reflectance of off-axis R-C system |
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| CN201210001084.1A CN102539120B (en) | 2012-01-04 | 2012-01-04 | Measuring method for spectral reflectance of off-axis R-C system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308282A (en) * | 2013-06-09 | 2013-09-18 | 中国科学院西安光学精密机械研究所 | Efficient measuring system and method for transmittance of reflecting telescoping system |
| CN107167302A (en) * | 2017-07-12 | 2017-09-15 | 北京卫星环境工程研究所 | Vacuum low-temperature environment imaging shaking detection device based on off-axis collimated optical system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS557634A (en) * | 1978-06-30 | 1980-01-19 | Shimadzu Corp | Colorimetric unit |
| JPS5763426A (en) * | 1980-10-03 | 1982-04-16 | Hitachi Ltd | Spectrophotometer |
| US20040062350A1 (en) * | 2002-09-26 | 2004-04-01 | Jenoptik Mikrotechnik Gmbh | Arrangement for determining the spectral reflectivity of a measurement object |
| CN201540161U (en) * | 2009-10-28 | 2010-08-04 | 沈阳仪表科学研究院 | Multi-angle light spectrum on-line measuring instrument of curved-surface light deflector |
| CN201885801U (en) * | 2010-11-25 | 2011-06-29 | 核工业北京地质研究院 | Spectrum measuring system |
-
2012
- 2012-01-04 CN CN201210001084.1A patent/CN102539120B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS557634A (en) * | 1978-06-30 | 1980-01-19 | Shimadzu Corp | Colorimetric unit |
| JPS5763426A (en) * | 1980-10-03 | 1982-04-16 | Hitachi Ltd | Spectrophotometer |
| US20040062350A1 (en) * | 2002-09-26 | 2004-04-01 | Jenoptik Mikrotechnik Gmbh | Arrangement for determining the spectral reflectivity of a measurement object |
| CN201540161U (en) * | 2009-10-28 | 2010-08-04 | 沈阳仪表科学研究院 | Multi-angle light spectrum on-line measuring instrument of curved-surface light deflector |
| CN201885801U (en) * | 2010-11-25 | 2011-06-29 | 核工业北京地质研究院 | Spectrum measuring system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308282A (en) * | 2013-06-09 | 2013-09-18 | 中国科学院西安光学精密机械研究所 | Efficient measuring system and method for transmittance of reflecting telescoping system |
| CN103308282B (en) * | 2013-06-09 | 2016-03-02 | 中国科学院西安光学精密机械研究所 | The efficient measuring system of reflective telescopic system transmitance and method |
| CN107167302A (en) * | 2017-07-12 | 2017-09-15 | 北京卫星环境工程研究所 | Vacuum low-temperature environment imaging shaking detection device based on off-axis collimated optical system |
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| CN102539120B (en) | 2014-04-02 |
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