CN100365399C - Self calibration method for remote sensing instrument optical system spectrum calibration - Google Patents
Self calibration method for remote sensing instrument optical system spectrum calibration Download PDFInfo
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- CN100365399C CN100365399C CNB2003101092483A CN200310109248A CN100365399C CN 100365399 C CN100365399 C CN 100365399C CN B2003101092483 A CNB2003101092483 A CN B2003101092483A CN 200310109248 A CN200310109248 A CN 200310109248A CN 100365399 C CN100365399 C CN 100365399C
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- relative spectral
- monochromator
- standard detector
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Abstract
The present invention relates to a self-calibration method for calibrating the spectrum of a remote sensing instrument. In the method, a standard detector is utilized to respectively measure a monochromator, a coupling optical system and a calibration mirror through the calibration mirror so as to determine the practical corresponding spectrums of the calibrated coupling optical system, the monochrometer and a light source through conversion. The present invention is established based on the specific coupling optical system which can fill the optical caliber of a calibrated remote sensing instrument; moreover, the present invention has the advantages of precise imaging and high measuring accuracy. The present invention has the maximal advantages that the present invention is strictly accurate in theory without approximation and errors and thus has a practical value on the calibration of high-accuracy spectrums.
Description
Technical field
The present invention relates to the remote sensing instrument spectral calibration, specifically be meant the calibration steps of the error of self being brought by the calibration optical system.
Background technology
When the remote sensing instrument spectral calibration, needs use the output spectrum of monochromator to make the calibration spectral sources of remote sensing instrument, because the spectrum of monochromator is through its slit output, light beam is dispersed, go for it is coupled in the remote sensing instrument of being calibrated, need the optical system of a beam-expanding collimation to be coupled usually.More satisfactory coupling optical system be one by connecting with directional light between two double reflection system, constitutes one four coupling optical system that reflects.See the patent " a kind of coupling four reflective opticss that are used for the remote sensing instrument spectral calibration " that the inventor applies for, application number: 200310108347.X.This moment, the light path of remote sensing instrument spectral calibration was: the light that is sent by light source 2 is divided into monochromatic light through monochromator 1, the light of monochromator 1 outgoing is through a coupling optical system 3, light beam is through coupling optical system 3 beam-expanding collimations, enter remote sensing instrument optical system 6, light beam can be full of the entrance pupil of remote sensing instrument optical system, sees Fig. 1.The efficient of light under different catadioptric firing angle situations that has solved like this by different wave length is different problems, has improved calibration precision.And remote sensing instrument output this moment is the relative spectral that comprises remote sensing instrument optical system, coupling optical system, monochromator, light source:
V(λ)＝V
e(λ)×V
o(λ)×V
g(λ)×V
L(λ)，(1)
Wherein: V
e(λ) be the relative spectral of remote sensing instrument optical system; V
o(λ) be the relative spectral of coupling optical system; V
g(λ) be the relative spectral of monochromator; V
L(λ) be the relative spectral of light source.
The relative spectral of remote sensing instrument optical system so:
V
e(λ)＝V(λ)/(V
o(λ)×V
g(λ)×V
L(λ))。(1′)
From following formula, can know, obtain the relative spectral V of remote sensing instrument
e(λ), must deduct and to be produced in the calibration process: as coupling optical system V
o(λ), monochromator V
g(λ), light source V
LRelative spectral (λ).Measure the relative spectral of coupling optical system, monochromator, light source, must use standard detector.If be placed directly in the exit end parallel beam of coupling optical system, because light beam is restrainted through expanding, the photosurface of standard detector is not too large, so it is very weak to record signal, measures insufficient sensitivity.If increase a catoptron again the parallel beam that expands bundle is assembled, luminous energy increases, and signal is to become big, but itself brings error again this catoptron, and when measuring the remote sensing instrument relative spectral, this catoptron does not participate in, and can't deduct the relative spectral of this piece catoptron.
Summary of the invention
Based on the problem that above-mentioned prior art exists, the objective of the invention is to propose a kind of method for self-calibrating of remote sensing instrument optical system spectral calibration.
This calibration steps is to utilize standard detector, by the calibration mirror, respectively monochromator, coupling optical system and calibration mirror is measured, and through converting, obtains the relative spectral of coupling optical system, monochromator, light source reality.Obtain the relative spectral of remote sensing instrument optical system at last, its concrete measuring process is:
(1) earlier with the relative spectral of standard detector 5 measurement monochromators 1, measures light path and see Fig. 2 with light source 2.The light that light source 2 sends is divided into monochromatic light through monochromator 1, and calibration mirror 4 converges to monochromatic light on the standard detector 5, and this moment, standard detector was output as:
V
1(λ)＝V
d(λ)×V
j(λ)×V
g(λ)×V
L(λ)。(2)
Wherein: V
d(λ) be the relative spectral of standard detector; V
j(λ) for calibrating the relative spectral of mirror; V
g(λ) be the relative spectral of monochromator; V
L(λ) be the relative spectral of light source.
(2) use standard detector 5 to measure the relative spectral of whole calibrating optical systems again, measure light path and see Fig. 3, the light that light source 2 sends is divided into monochromatic light through monochromator 1, the concave spherical mirror 302 of monochromatic light directed coupling optical system 3, assemble to protruding spherical reflector 301 through its reflection, reflect to convex paraboloid secondary mirror 304 by protruding spherical reflector 301, reflect to concave paraboloid principal reflection mirror 303 by convex paraboloid secondary mirror 304 again, form the directional light of a branch of beam-expanding collimation, calibration mirror 4 converges to directional light on the standard detector 5, and this moment, standard detector was output as:
V
2(λ)＝V
d(λ)×V
j(λ)×V
o(λ)×V
g(λ)×V
L(λ)，(3)
V in the formula
o(λ) be the relative spectral of coupling optical system;
(3) the last relative spectral of directly measuring monochromator and light source at the exit slit place of monochromator 1 with standard detector 5, this moment, standard detector was output as:
V
3(λ)＝V
d(λ)×V
g(λ)×V
L(λ)。(4)
(2), (3), the computing of (4) formula process simple mathematical can be obtained calibrating the relative spectral of mirror:
V
j(λ)＝V
1(λ)/V
3(λ)。(5)
The relative spectral of standard detector, coupling optical system, monochromator and light source thereof:
V
2(λ)/V
j(λ)＝V
d(λ)×V
o(λ)×V
g(λ)×V
L(λ)。(6)
The relative spectral of remote sensing instrument optical system:
V
e(λ)＝(V(λ)×V
1(λ)×V
d(λ))/(V
2(λ)×V
3(λ))。(7)
V in the formula
dBeing the relative spectral of standard detector (λ), is known.
The present invention has following beneficial effect:
1. method for self-calibrating of the present invention is strict accurate in theory, and not approximate and error is with practical value for high-precision spectral calibration.
2. the method for self-calibrating of spectral calibration optical system of the present invention, be to be based upon on the basis of special coupling optical system, this coupling optical system has been full of the optics bore of the remote sensing instrument optical system of being demarcated, and can accurately image, the measuring accuracy height.
Description of drawings
Fig. 1 remote sensing instrument calibration optical system light path synoptic diagram;
Fig. 2 measures the relative spectral light path synoptic diagram of monochromator and light source;
Fig. 3 measures the relative spectral light path synoptic diagram of coupling optical system, monochromator and light source.
Embodiment
See Fig. 1, light source 2 is two lamps: 250W halogen tungsten lamp, 120W high-pressure sodium lamp, monochromator 1 is the TR320 from U.S.'s import: spectral range 0.3～15 μ m, relative aperture 1/F=1: 4, standard detector 5 is the graduate Si detector of China national metrology and measurement (comprise and read demonstration), coupling optical system 3 is four reflective opticss: bore 210mm, focal length 800mm, relative aperture 1/F=1: 3.8, catoptron is the reflectance coating of aluminizing, and calibration mirror 4 is concave spherical mirror: bore 84mm, focal length 143mm, relative aperture 1/F=1: the reflectance coating of 1.7, aluminizing.
Said coupling optical system 3 constitutes a spherical double reflection system by protruding spherical reflector 301, concave spherical mirror 302 from right to left in order, concave paraboloid principal reflection mirror 303, convex paraboloid secondary mirror 304 constitute a no burnt double reflection system, two double reflection system connect with directional light, become one four reflective optics, between two double reflection system continuously apart from requiring.
Obtain V by three pacing amount steps in the technique scheme
1(λ), V
2(λ) and V
3(λ), computing can obtain calibrating the relative spectral of mirror, coupling optical system, monochromator and light source, last proper remote sensing instrument relative spectral through simple mathematical.
Claims (1)
1. method for self-calibrating that is used for remote sensing instrument optical system spectral calibration is characterized in that the concrete steps of this method are as follows:
(A) earlier with the relative spectral of standard detector (5) measurement monochromator (1) with light source (2), the light that light source (2) sends is divided into monochromatic light through monochromator (1), calibration mirror (4) converges to monochromatic light on the standard detector (5), and this moment, standard detector was output as:
V
1(λ)＝V
d(λ)×V
j(λ)×V
g(λ)×V
L(λ)， (2)
Wherein: V
d(λ) be the relative spectral of standard detector; V
j(λ) for calibrating the relative spectral of mirror; V
g(λ) be the relative spectral of monochromator; V
L(λ) be the relative spectral of light source;
(B) use standard detector (5) to measure the relative spectral of whole calibrating system again, the light that light source (2) sends is divided into monochromatic light through monochromator (1), the concave spherical mirror (302) of monochromatic light directed coupling optical system (3), assemble to protruding spherical reflector (301) through its reflection, reflect to convex paraboloid secondary mirror (304) by protruding spherical reflector (301), reflect to concave paraboloid principal reflection mirror (303) by convex paraboloid secondary mirror (304) again, form the directional light of a branch of beam-expanding collimation, calibration mirror (4) converges to directional light on the standard detector (5), and this moment, standard detector was output as:
V
2(λ)＝V
d(λ)×V
j(λ)×V
o(λ)×V
g(λ)×V
L(λ)， (3)
V in the formula
o(λ) be the relative spectral of coupling optical system;
(C) the last spectrum of directly measuring monochromator and light source at the exit slit place of monochromator (1) with standard detector (5), this moment, standard detector was output as:
V
3(λ)＝V
d(λ)×V
g(λ)×V
L(λ)， (4)
(2), (3), the computing of (4) formula process simple mathematical are obtained calibrating the relative spectral of mirror:
V
j(λ)＝V
1(λ)/V
3(λ)， (5)
The relative spectral of standard detector, coupling optical system, monochromator and light source thereof:
V
2(λ)/V
j(λ)＝V
d(λ)×V
o(λ)×V
g(λ)×V
L(λ)， (6)
The relative spectral of remote sensing instrument optical system:
V
e(λ)＝(V(λ)×V
1(λ)×V
d(λ))/(V
2(λ)×V
3(λ))， (7)
V in the formula
dBe known (λ), V (λ)=V
e(λ) * V
o(λ) * V
g(λ) * V
L(λ), they are respectively the relative spectrals of optical system; The relative spectral of coupling optical system; The relative spectral of monochromator; The relative spectral of light source.
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| CNB2003101092483A CN100365399C (en) | 2003-12-11 | 2003-12-11 | Self calibration method for remote sensing instrument optical system spectrum calibration |
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|---|---|---|---|
| CNB2003101092483A CN100365399C (en) | 2003-12-11 | 2003-12-11 | Self calibration method for remote sensing instrument optical system spectrum calibration |
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| CN100365399C true CN100365399C (en) | 2008-01-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788643A (en) * | 2012-07-13 | 2012-11-21 | 中国科学院长春光学精密机械与物理研究所 | Method for calibrating ontrack high-precision optical spectrum of space remote sensing optical spectrum instrument |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100354615C (en) * | 2005-05-20 | 2007-12-12 | 中国科学院上海技术物理研究所 | Device and method for detecting instantaneous field registration between detection channels of remote sensing instrument |
| CN106197665B (en) * | 2015-04-29 | 2018-11-09 | 中国科学院苏州纳米技术与纳米仿生研究所 | Spectrum test device and its test method |
| CN107219001A (en) * | 2017-07-05 | 2017-09-29 | 苏州华徕光电仪器有限公司 | A kind of spectral calibration equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4233995A (en) * | 1979-04-12 | 1980-11-18 | Risdon Corporation | Cigarette/cigar treatment device |
| US5677765A (en) * | 1995-10-06 | 1997-10-14 | Vlsi Standards, Inc. | Method for calibrating a topographic instrument |
-
2003
- 2003-12-11 CN CNB2003101092483A patent/CN100365399C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4233995A (en) * | 1979-04-12 | 1980-11-18 | Risdon Corporation | Cigarette/cigar treatment device |
| US5677765A (en) * | 1995-10-06 | 1997-10-14 | Vlsi Standards, Inc. | Method for calibrating a topographic instrument |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788643A (en) * | 2012-07-13 | 2012-11-21 | 中国科学院长春光学精密机械与物理研究所 | Method for calibrating ontrack high-precision optical spectrum of space remote sensing optical spectrum instrument |
| CN102788643B (en) * | 2012-07-13 | 2014-03-12 | 中国科学院长春光学精密机械与物理研究所 | Method for calibrating ontrack high-precision optical spectrum of space remote sensing optical spectrum instrument |
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