CN103256977A - Radiance calibration method of large visual field optical remote sensing instrument - Google Patents
Radiance calibration method of large visual field optical remote sensing instrument Download PDFInfo
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- CN103256977A CN103256977A CN2013101800917A CN201310180091A CN103256977A CN 103256977 A CN103256977 A CN 103256977A CN 2013101800917 A CN2013101800917 A CN 2013101800917A CN 201310180091 A CN201310180091 A CN 201310180091A CN 103256977 A CN103256977 A CN 103256977A
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Abstract
The invention relates to a radiance calibration method of a large visual field optical remote sensing instrument. The radiance calibration method includes the following steps: the radial direction of a calibration system is changed by means of an external reflection unit, the radiation which has high-quality Burt characteristic in the calibration system radiation source is reflected to the visual field of the large visual field optical remote sensing instrument, and the full visual field radiance is calibrated. By means of the radiance calibration method of the large visual field optical remote sensing instrument, according to the multidirectional structural features of the large visual field, an external reflecting system of a circle structure composed of special plane mirrors is designed, a fixed angle is formed, the radiation with the high-quality Burt characteristic within an angle in a range of from a integrating sphere plus 30 degrees and the integrating sphere minus 30 degrees is reflexed to the direction meeting system calibration, therefore, the integrating sphere in not enlarged, the radiation with the high-quality Burt characteristic within the angle in the range of from the integrating sphere plus 30 degrees and the integrating sphere minus 30 degrees is fully used, and the radiance calibration of the large visual field optical remote sensing instrument is achieved.
Description
Technical field
The invention belongs to optical radiation calibration technology field, be specifically related to a kind of expansion integrating sphere and use area, carry out spoke brightness calibration, big visual field 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 two kinds of methods of detector.Integrating sphere is based on the light source method and carries out most widely used radiation source in the remote sensing instrument radiation calibration because it has larger area opening and good homogeneous.Integrating sphere normally is made up of a plurality of equally distributed light sources and the inner global shell that scribbles the uniform diffuse reflection coating, and light source makes the integrating sphere outlet have good lambert's characteristic in ± 30 ° of angular ranges approximately to the spheroid internal irradiation through the inner diffuse reflection of spheroid.The principle of utilizing integrating sphere to carry out spoke brightness calibration is exactly the one-to-one relationship of setting up between instrument opening input quantity and the electronics output quantity.
Yet integrating sphere spoke brightness calibration is limited by it and only has good lambert's characteristic in ± 30 ° of angular range, and for the remote sensing instrument of field angle above its lambert's characteristic range, the integrating sphere calibration will bring great uncertainty.Therefore, determine used integrating sphere size according to the visual field of being demarcated remote sensing instrument usually, to guarantee calibration precision.
In recent years, survey demand for satisfying the space atmospheric remote sensing, a kind of 140 °-150 ° multi-faceted detection instruments in the big visual field of annular have been developed, for this type of instrument calibration, adopt the integrating sphere of diameter more than 5 meters, the side might satisfy the multi-faceted requirement of calibration simultaneously in big visual field, and the cost more than 5 meters and technical difficulty greatly improve, and the integrating sphere brightness uniformity is difficult for guaranteeing.If utilize conventional integrating sphere, then need to cut apart visual field piecemeal calibration, the system of not accomplishing calibrates full visual field, can not satisfy the needs of detection.
Summary of the invention
The present invention will solve spoke brightness calibrating method of the prior art and can not carry out system's full visual field calibration, can't satisfy the technical matters that detects needs, at big visual field remote optical sensing instrument, particularly at 140 °-150 ° multi-faceted detection instruments in the big visual field of annular, proposing a kind of integrating sphere of expanding uses area and sets up that new radiation source calibrates, big visual field 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 big visual field remote optical sensing instrument spoke brightness calibrating method may further comprise the steps:
Utilize external reflection unit to change the radiation direction of scaling system, the radiation with high-quality lambert characteristic of radiation source in the scaling system is reflexed in the visual field of big visual field remote optical sensing instrument, to carry out the spoke brightness calibration of full visual field.
In the technique scheme, the radiation with high-quality lambert characteristic of described radiation source be specially integrating sphere ± radiation in 30 ° of angles.
In the technique scheme, described big visual field remote optical sensing instrument is the multi-faceted detection instrument in the big visual field of annular, and its front end is provided with the polylith catoptron, the space multi-faceted radiation of annular can be introduced optical system and survey.
In the technique scheme, described external reflection unit comprises: fixed angle, with the identical a plurality of level crossings of polylith number of mirrors in the multi-faceted detection instrument in the big visual field of annular;
A plurality of level crossings can be turned back the radiation in ° angle of integrating sphere ± 30 to and be satisfied the direction of system calibration.
In the technique scheme, each the reflecting surface angle calibration of described a plurality of level crossings is by setting up common reference plane mirror, being measured one by one, debugged and finish by transit.
In the technique scheme, before carrying out system's full visual field spoke brightness calibration, also comprise step:
Be that benchmark is set up optical axis with transit with the reference plane mirror.
In the technique scheme, before carrying out system's full visual field spoke brightness calibration, also comprise step:
Utilize absolute radiometer that radiation source is carried out uniformity test and the transmission of spoke luminance standard, make it have the absolute standard of calibrating instrument.
The present invention has following beneficial effect:
The present invention is directed to big visual field remote optical sensing instrument, especially 140 °-150 ° multi-faceted detection instruments in the big visual field of annular have been proposed to expand integrating sphere application area and set up the method that new radiation source carries out spoke brightness calibration.External reflection unit according to big visual field multi-faceted detection instrument design feature design specialized level crossing composition loop configuration forms fixed angle, the radiation of high-quality lambert characteristic in ° angle of integrating sphere ± 30 is turned back to satisfy the direction of system calibration.Thereby need not increase the radiation that integrating sphere just takes full advantage of high-quality lambert characteristic in ° angle of integrating sphere ± 30, by the standard transmission, realize the remote optical sensing instrument spoke brightness calibration of big visual field.
The present invention need not increase integrating sphere and can not be subjected to integrating sphere lambert properties influence, can realize that full visual field calibrates simultaneously, and can guarantee that the calibration uncertainty meets the demands.
Description of drawings
Fig. 1 utilizes new radiation source (expansion integrating sphere) to carry out the synoptic diagram of big visual field remote optical sensing instrument spoke brightness calibrating method.
Fig. 2 is the external reflection unit adjustment of the expansion integrating sphere synoptic diagram for the remote optical sensing instrument spoke brightness calibration of big visual field.
Fig. 3 is the synoptic diagram that the new radiation source of expanding the integrating sphere formation is carried out uniformity test and radiation standard transmission.
Reference numeral among the figure is expressed as:
1-is calibrated remote sensing instrument; The external reflection unit of 2-; The 3-integrating sphere; 4-reference plane mirror; The 5-transit; The 6-jackscrew; The 7-level crossing; The 8-radiometer.
Embodiment
Invention thought of the present invention is: the present invention is directed to 140 °-150 ° multi-faceted detection instrument design features in the big visual field of annular and be front end and the polylith catoptron is set optical system is introduced in the space multi-faceted radiation of annular is surveyed.The external reflection unit of forming loop configuration according to the level crossing of the multi-faceted detection instrument design feature design in the big visual field of this annular equal amount, form fixed angle, the radiation of high-quality lambert characteristic in ° angle of integrating sphere ± 30 is turned back to satisfy the direction of system calibration.Thereby realize enlarging integrating sphere application area (angle) and set up new radiation source, to satisfy the remote optical sensing instrument spoke brightness calibration requirement of big visual field.
External reflection unit adjustment criterion: set up a reference plane mirror, make new radiation source optical axis that external reflection unit and integrating sphere constitute and the angle of the reference plane mirror normal of setting up equal the annular center angle of half field-of view of instrument.Be benchmark with the reference plane mirror, with transit one by one adjustment constitute each level crossing of external reflection unit, to guarantee each level crossing angle consistance.
The new radiation source outgoing uniformity of light that external reflection unit and integrating sphere constitute utilizes absolute radiometer to detect correction, can utilize simultaneously absolute radiometer that the new radiation source that constitutes is carried out the spoke luminance standard and transmit (calibration), make it have the absolute standard of calibrating instrument.
Below in conjunction with the drawings and specific embodiments the present invention is done to describe further:
As shown in Figure 1, according to being required the external reflection unit 2 of design specialized by calibration remote sensing instrument 1 visual field, after external reflection unit 2 is set up with integrating sphere 3 ± homogeneous radiations in 30 ° of angles, convert the angle that calibration requires to, external reflection unit 2 is formed new radiation source with integrating sphere 3, thereby realizes big visual field remote optical sensing instrument calibration.Described external reflection unit 2 comprises: fixed angle, a plurality of level crossings 7 identical with polylith number of mirrors in the multi-faceted detection instrument in the big visual field of annular; A plurality of level crossings 7 can with integrating sphere 3 ± radiation in 30 ° of angles turn back to and satisfy the direction of system calibration.
As shown in Figure 2, set up reference plane mirror 4, by transit 5 monitorings, utilize the angle of fine setting jackscrew 6 each level crossing 7 of debugging to reach request for utilization with this benchmark.
As shown in Figure 3, after angle meets design requirement, utilize 8 pairs of new radiation sources of radiometer to carry out brightness uniformity and detect and radiation standard transmission (calibration).New radiation source (expansion integrating sphere) is the general designation of integrating sphere 3 and external reflection unit 2.
After radiation standard was delivered to new radiation source, namely the radiation source of available new formation carried out radiation calibration to big visual field remote optical sensing instrument.
In the technique scheme, a plurality of level crossing 7 each reflecting surface angle calibration are by setting up common reference plane mirror 4, being measured one by one, debugged and finish by transit 5.
Carrying out also comprising step before the system full visual field spoke brightness calibration: be that benchmark is set up optical axis with transit 5 with reference plane mirror 4; And utilize absolute radiometer that radiation source is carried out the transmission of spoke luminance standard, make it have the absolute standard of calibrating instrument.
The content that the present invention does not describe in detail is technology as well known to those skilled in the art.
Obviously, above-described embodiment only is for example clearly is described, and is not the restriction 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 need not also can't give all embodiments exhaustive.And the apparent variation of being extended out thus or change still are among the protection domain of the invention.
Claims (7)
1. one kind big visual field remote optical sensing instrument spoke brightness calibrating method is characterized in that, may further comprise the steps:
Utilize external reflection unit to change the radiation direction of scaling system, the radiation with high-quality lambert characteristic of radiation source in the scaling system is reflexed in the visual field of big visual field remote optical sensing instrument, to carry out the spoke brightness calibration of full visual field.
2. calibrating method according to claim 1 is characterized in that, the radiation with high-quality lambert characteristic of described radiation source be specially integrating sphere ± radiation in 30 ° of angles.
3. calibrating method according to claim 1 is characterized in that, described big visual field remote optical sensing instrument is the multi-faceted detection instrument in the big visual field of annular, and its front end is provided with the polylith catoptron, the space multi-faceted radiation of annular can be introduced optical system and survey.
4. calibrating method according to claim 3 is characterized in that, described external reflection unit comprises: fixed angle, a plurality of level crossings identical with polylith number of mirrors in the multi-faceted detection instrument in the big visual field of annular;
A plurality of level crossings can be turned back the radiation in ° angle of integrating sphere ± 30 to and be satisfied the direction of system calibration.
5. calibrating method according to claim 4 is characterized in that, each the reflecting surface angle calibration of described a plurality of level crossings is by setting up common reference plane mirror, being measured one by one, debugged and finish by transit.
6. calibrating method according to claim 1 is characterized in that, also comprises step before carrying out system's full visual field spoke brightness calibration:
Be that benchmark is set up optical axis with transit with the reference plane mirror.
7. calibrating method according to claim 1 is characterized in that, also comprises step before carrying out system's full visual field spoke brightness calibration:
Utilize absolute radiometer that radiation source is carried out uniformity test and the transmission of spoke luminance standard, make it have the absolute standard of calibrating instrument.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105157827A (en) * | 2015-04-23 | 2015-12-16 | 中国科学院长春光学精密机械与物理研究所 | Integrating sphere transmission radiometer for ontrack spectrum radiation absolute calibration for remote sensor |
| CN105764228A (en) * | 2014-12-19 | 2016-07-13 | 中国科学院空间科学与应用研究中心 | Calibration system and method of space neutral atom detecting instrument |
| CN107607194A (en) * | 2017-10-27 | 2018-01-19 | 中国科学院西安光学精密机械研究所 | High-dynamic multipoint continuous photoelectric detector energy response characteristic calibration system and method |
| 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 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105764228A (en) * | 2014-12-19 | 2016-07-13 | 中国科学院空间科学与应用研究中心 | Calibration system and method of space neutral atom detecting instrument |
| 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 |
| CN105157827A (en) * | 2015-04-23 | 2015-12-16 | 中国科学院长春光学精密机械与物理研究所 | Integrating sphere transmission radiometer for ontrack spectrum radiation absolute calibration for remote sensor |
| CN107607194A (en) * | 2017-10-27 | 2018-01-19 | 中国科学院西安光学精密机械研究所 | High-dynamic multipoint continuous photoelectric detector energy response characteristic calibration system and method |
| 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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