CN103256977B - A kind of Large visual angle remote optical sensing instrument spoke brightness calibrating method - Google Patents
A kind of Large visual angle remote optical sensing instrument spoke brightness calibrating method Download PDFInfo
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- CN103256977B CN103256977B CN201310180091.7A CN201310180091A CN103256977B CN 103256977 B CN103256977 B CN 103256977B CN 201310180091 A CN201310180091 A CN 201310180091A CN 103256977 B CN103256977 B CN 103256977B
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Abstract
The present invention relates to a kind of Large visual angle remote optical sensing instrument spoke brightness calibrating method, comprise the following steps: utilize external reflection unit to change the radiation direction of scaling system, by the radiation reflective with high-quality Lambertian characteristics of radiation source in scaling system in the visual field of Large visual angle remote optical sensing instrument, to carry out full filed spoke brightness calibration.The present invention is according to the external reflecting system of Large visual angle multi-faceted detection instrument design feature design specialized level crossing composition loop configuration, form fixed angle, the radiation of high-quality Lambertian characteristics in ° angle of integrating sphere ± 30 is turned back to and meets the direction of system calibration, thus the radiation that integrating sphere just makes full use of high-quality Lambertian characteristics in ° angle of integrating sphere ± 30 need not be increased, transmitted by standard, realize Large visual angle remote optical sensing instrument spoke brightness calibration.
Description
Technical field
The invention belongs to optical radiation calibration technology field, be specifically related to a kind of expand integrating sphere application area, carry out spoke brightness calibration, Large visual angle remote optical sensing instrument spoke brightness calibrating method.
Background technology
The radiation calibration of remote sensing instrument can be summed up as based on light source with based on detector two kinds of methods.Integrating sphere has the opening of larger area and good homogeneity because of it, is to carry out most widely used radiation source in remote sensing instrument radiation calibration based on Light Source Method.Integrating sphere is normally made up of multiple equally distributed light source and the inner global shell scribbling uniform diffuse reflection coating, and light source irradiates to ball interior, through ball interior diffuse reflection, integrating sphere is exported in about ± 30 ° of angular ranges and has excellent Lambertian characteristics.The principle utilizing integrating sphere to carry out spoke brightness calibration is exactly set up the one-to-one relationship between instrument opening input quantity and electronics output quantity.
But integrating sphere spoke brightness calibration is limited by it and only has excellent Lambertian characteristics in ± 30 ° of angular ranges, field angle is exceeded to the remote sensing instrument of its Lambertian characteristics scope, integrating sphere calibration will bring great uncertainty.Therefore, usually integrating sphere size used is determined, to ensure calibration precision according to by the visual field demarcating remote sensing instrument.
In recent years, for meeting spatial atmospheric remote sensing detection demand, a kind of 140 °-150 ° multi-faceted detection instruments of annular Large visual angle are developed, for this type of instrument calibration, adopt the integrating sphere of diameter more than 5 meters, side likely meets the multi-faceted requirement of simultaneously calibrating of Large visual angle, and the cost of more than 5 meters and technical difficulty greatly improve, and integrating sphere brightness uniformity not easily ensures.If utilize regular integral ball, then need the piecemeal calibration of segmentation visual field, do not accomplish that system full filed is calibrated, the needs of detection can not be met.
Summary of the invention
The present invention will solve spoke brightness calibrating method of the prior art and can not carry out the calibration of system full filed, cannot meet the technical matters detecting needs, for Large visual angle remote optical sensing instrument, particularly for 140 °-150 ° multi-faceted detection instruments of annular Large visual angle, propose a kind of integrating sphere application area of expanding and set up that new radiation source carries out calibrating, Large visual angle remote optical sensing instrument spoke brightness calibrating method.
In order to solve the problems of the technologies described above, technical scheme of the present invention is specific as follows:
A kind of Large visual angle remote optical sensing instrument spoke brightness calibrating method, comprises the following steps:
External reflection unit is utilized to change the radiation direction of scaling system, by the radiation reflective with high-quality Lambertian characteristics of radiation source in scaling system in the visual field of Large visual angle remote optical sensing instrument, to carry out full filed spoke brightness calibration.
In technique scheme, the radiation with high-quality Lambertian characteristics of described radiation source be specially integrating sphere ± 30 ° of angles in radiation.
In technique scheme, described Large visual angle remote optical sensing instrument is the multi-faceted detection instrument of annular Large visual angle, and its front end is provided with polylith catoptron, the space multi-faceted radiation of annular can be introduced optical system and detect.
In technique scheme, described external reflection unit comprises: fixed angle, multiple level crossing identical with the polylith number of mirrors in the multi-faceted detection instrument of annular Large visual angle;
Radiation in ° angle of integrating sphere ± 30 can be turned back to and be met the direction of system calibration by multiple level crossing.
In technique scheme, the calibration of described multiple level crossing each reflecting face is by setting up common reference plane mirror, being measured one by one, debugged by transit.
In technique scheme, before carrying out system full filed spoke brightness calibration, also comprise step:
With transit with reference plane mirror for benchmark sets up optical axis.
In technique scheme, before carrying out system full filed spoke brightness calibration, also comprise step:
Utilize absolute radiometer to carry out uniformity test and the transmission of spoke luminance standard to radiation source, make it have the absolute standard of calibrating instrument.
The present invention has following beneficial effect:
The present invention is directed to Large visual angle remote optical sensing instrument, especially 140 °-150 ° multi-faceted detection instruments of annular Large visual angle are proposed and expand integrating sphere application area and set up new radiation source and carry out spoke brightness and determine calibration method.According to the external reflection unit of Large visual angle multi-faceted detection instrument design feature design specialized level crossing composition loop configuration, form fixed angle, the radiation of high-quality Lambertian characteristics in ° angle of integrating sphere ± 30 is turned back to and meets the direction of system calibration.Thus the radiation that integrating sphere just makes full use of high-quality Lambertian characteristics in ° angle of integrating sphere ± 30 need not be increased, transmitted by standard, realize Large visual angle remote optical sensing instrument spoke brightness calibration.
The present invention need not increase integrating sphere and can not be subject to the impact of integrating sphere Lambertian characteristics, can realize full filed and calibrate simultaneously, and can ensure that calibration uncertainty meets the demands.
Accompanying drawing explanation
Fig. 1 is the schematic diagram utilizing new radiation source (expansion integrating sphere) to carry out Large visual angle remote optical sensing instrument spoke brightness calibrating method.
Fig. 2 is the expansion integrating sphere external reflection unit adjustment schematic diagram for Large visual angle remote optical sensing instrument spoke brightness calibration.
Fig. 3 is the schematic diagram new radiation source expanding integrating sphere formation being carried out to uniformity test and radiation standard transmission.
Reference numeral in figure is expressed as:
The scaled remote sensing instrument of 1-; The external reflection unit of 2-; 3-integrating sphere; 4-reference plane mirror; 5-transit; 6-jackscrew; 7-level crossing; 8-radiometer.
Embodiment
Invention thought of the present invention is: the present invention is directed to 140 °-150 ° annular Large visual angle multi-faceted detection instrument design features is that front end arranges polylith catoptron and optical system is introduced in the space multi-faceted radiation of annular detects.According to the external reflection unit of the level crossing composition loop configuration of this annular Large visual angle multi-faceted detection instrument design feature design equal amount, form fixed angle, the radiation of high-quality Lambertian characteristics in ° angle of integrating sphere ± 30 is turned back to and meets the direction of system calibration.Thus new radiation source is set up in realization expansion integrating sphere application area (angle), to meet Large visual angle remote optical sensing instrument spoke brightness calibration requirement.
External reflection unit adjustment criterion: set up one piece of reference plane mirror, the new radiation source optical axis that external reflection unit and integrating sphere are formed equals the annular center angle of half field-of view of instrument with the angle of the reference plane mirror normal set up.With reference plane mirror for benchmark, with transit one by one adjustment form each level crossing of external reflection unit, to ensure each level crossing angle agreement.
The homogeneity of the new radiation source emergent light that external reflection unit and integrating sphere are formed utilizes absolute radiometer to carry out detection correction, absolute radiometer can be utilized to carry out spoke luminance standard transmission (calibration) to formed new radiation source simultaneously, make it have the absolute standard of calibrating instrument.
Below in conjunction with the drawings and specific embodiments, the present invention is further described:
As shown in Figure 1, the external reflection unit 2 of design specialized is required according to scaled remote sensing instrument 1 visual field, external reflection unit 2 set up after by integrating sphere 3 ± 30 ° of angles in homogeneous radiation, convert the angle that calibration requires to, external reflection unit 2 forms new radiation source with integrating sphere 3, thus realizes Large visual angle remote optical sensing instrument calibration.Described external reflection unit 2 comprises: fixed angle, the multiple level crossings 7 identical with the polylith number of mirrors in the multi-faceted detection instrument of annular Large visual angle; Multiple level crossing 7 can by integrating sphere 3 ± 30 ° of angles in radiation turn back to and meet the direction of system calibration.
As shown in Figure 2, set up reference plane mirror 4, monitored with this benchmark by transit 5, the angle utilizing fine setting jackscrew 6 to debug each level crossing 7 reaches request for utilization.
As shown in Figure 3, after angle meets design requirement, radiometer 8 is utilized to carry out brightness uniformity detection and radiation standard transmission (calibration) to new radiation source.New radiation source (expansion integrating sphere) the i.e. general designation of integrating sphere 3 and external reflection unit 2.
After radiation standard is delivered to new radiation source, namely the radiation source of available new formation carries out radiation calibration to Large visual angle remote optical sensing instrument.
In technique scheme, the calibration of multiple level crossings 7 each reflecting face is by setting up common reference plane mirror 4, being measured one by one by transit 5, debugged.
Carrying out the brightness of system full filed spoke calibration before also comprise step: with transit 5 with reference plane mirror 4 for benchmark sets up optical axis; And utilize absolute radiometer to carry out the transmission of spoke luminance standard to radiation source, make it have the absolute standard of calibrating instrument.
The content that the present invention does not describe in detail is known to the skilled person technology.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (3)
1. a Large visual angle remote optical sensing instrument spoke brightness calibrating method, is characterized in that, comprise the following steps:
External reflection unit is utilized to change the radiation direction of scaled system, by the radiation reflective with high-quality Lambertian characteristics of radiation source in scaled system to Large visual angle remote optical sensing instrument, to carry out full filed spoke brightness calibration;
The radiation with high-quality Lambertian characteristics of described radiation source be specially integrating sphere ± 30 ° of angles in radiation;
Described external reflection unit comprises: fixed angle, the multiple level crossings identical with the polylith number of mirrors in the multi-faceted detection instrument of annular Large visual angle;
Radiation in ° angle of integrating sphere ± 30 can be turned back to and be met the direction of system calibration by multiple level crossing.
2. calibrating method according to claim 1, is characterized in that, the calibration of described multiple level crossing each reflecting face is by setting up common reference plane mirror, being measured one by one, debugged by transit.
3. calibrating method according to claim 2, is characterized in that, before carrying out system full filed spoke brightness calibration, also comprise step:
With transit with reference plane mirror for benchmark sets up optical axis.
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| CN105764228B (en) * | 2014-12-19 | 2018-04-24 | 中国科学院空间科学与应用研究中心 | A kind of scaling system and method for space neutral atom probe instrument |
| CN105785426B (en) * | 2014-12-19 | 2018-08-14 | 中国科学院空间科学与应用研究中心 | A kind of method and device of space neutral atom imager calibration |
| CN105157827B (en) * | 2015-04-23 | 2017-07-14 | 中国科学院长春光学精密机械与物理研究所 | Integrating sphere for the in-orbit spectral radiance absolute calibration of remote sensor transmits radiometer |
| CN107607194B (en) * | 2017-10-27 | 2023-05-02 | 中国科学院西安光学精密机械研究所 | High-dynamic multi-point continuous photoelectric detector energy response characteristic calibration system and method |
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| CN101650225A (en) * | 2009-09-16 | 2010-02-17 | 中国科学院安徽光学精密机械研究所 | Absolute spectral radiance luminance responsivity calibrating system utilizing wide tunable laser |
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| US7256390B1 (en) * | 2005-11-18 | 2007-08-14 | Raytheon Company | Inflatable spherical integrating source for spaceflight applications having a reflective interior surface |
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| CN101650225A (en) * | 2009-09-16 | 2010-02-17 | 中国科学院安徽光学精密机械研究所 | Absolute spectral radiance luminance responsivity calibrating system utilizing wide tunable laser |
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