CN208902265U - Spectrum calibration system suitable for spaceborne wide spectrum camera - Google Patents
Spectrum calibration system suitable for spaceborne wide spectrum camera Download PDFInfo
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Abstract
This patent discloses a kind of spectrum calibration system suitable for spaceborne wide spectrum camera, and scaling system is made of halogen lamp, monochromator, three hole General integral balls and high-precision spectrometer.The light that halogen lamp issues obtains monochromatic light by monochromator splitting, and monochromatic light enters three hole General integral balls, appears uniform light from other two holes after the integrated ball inside face reflection of incident light.With the radiance of the one of light-emitting window of high-precision spectrometer measurement, another light-emitting window is imaged with wide spectrum camera.The spectral response functions of wide spectrum camera are obtained by calculating.Light is divided into uniform two-way by three hole General integral balls, both it can pass through the radiance spectrum in high-precision spectrometer measurement wide spectrum, it can realize the two synchro measure with wide spectrum camera synchronous imaging again, improve wide spectrum camera spectral calibration efficiency and precision.
Description
Technical field
This patent is related to technical field of earth observation, and in particular to a kind of high-precision light that spaceborne wide spectrum camera can be achieved
Spectrum calibration system.
Background technique
Spaceborne wide spectrum camera has many advantages, such as that energy is big, signal-to-noise ratio is high, spatial resolution is high.Be usually used in space survey,
The earth observations fields such as land resources reconnoitre, ECOLOGICAL ENVIRONMENTAL MONITORING.It is the important member in remote sensing load.As remote sensing is quantitative
The demand for changing application, is also stepped up the quantification of spaceborne wide spectrum camera data.And the high-precision light of wide spectrum camera
Spectrum calibration and radiation calibration are the important leverages of its quantification application.
Atural object radiation, which enters sensor, substantially can be summarized as two processes, (1) radiation transmission sensor optical system, and by
Detector receives, which has a filtering, usually with spectral response functions come quantitative description；(2) photoelectricity/analog-to-digital conversion
Process, by photoelectric conversion, becomes voltage or current signal after detector receives radiation, through analog-to-digital conversion, obtains after circuit output
To the DN value of record.Radiation calibration mainly connects DN value and entrance pupil radiance, and DN value is converted to radiance.
The two processes will accurately be described by carrying out precise irradiation calibration.Determine that spectral response functions are the first of radiation calibration
Step.The task of spectral calibration is exactly the spectral response functions of the determining each wave band of wide spectrum camera.
For convenience of calculation, spectral response functions generally are substituted with normalized spectral response functions, doing so can keep away
Exempt to solve radiation calibration coefficient.For hyperspectral imager, single wave band institute is smaller across wavelength, it will be assumed that monochromator emergent light exists
It is constant in the responded all wavelengths of some wave band.For bloom spectrum loading, spectral calibration process does not need known institute
There is the radiance value of wavelength.Under normal conditions, it the radiance of monochromator emergent light and can be varied widely with wavelength.Cause
This generally uses reference standard detector synchro measure radiance in wide spectrum camera.
Common wide spectrum camera spectrum calibration system is mainly to utilize the monochromatic collimated light for passing through wavelength and radiometric calibration
Source lighting camera focal plane detector, light enter camera by monochromator splitting and then by parallel light tube.To improve space
Resolution ratio, spaceborne wide spectrum camera lens are relatively large sized, and parallel light tube spot size is difficult to entire full of camera sometimes
Visual field.In addition, also needing to refer to standard detector imaging, the complexity of measurement is virtually increased.
To sum up, incident monochromatic light is modulated to the uniform monochromatic light of two-way using three hole General integral balls, with high-precision spectrum
Instrument measures the radiance of one of light-emitting window, another light-emitting window is imaged with wide spectrum camera.It both can be by high-precision
The radiance spectrum in spectrometer measurement wide spectrum is spent, and can realize the same pacing of the two with wide spectrum camera synchronous imaging
Amount, improves wide spectrum camera spectral calibration efficiency and precision.
Summary of the invention
Blank and disadvantage in view of the prior art, this patent is good the technical problem to be solved is that a kind of accuracy is provided,
Speed is fast, easy-operating spaceborne wide spectrum camera spectrum calibration system.
In order to solve the above-mentioned technical problem, a kind of spectral calibration system suitable for spaceborne wide spectrum camera that this patent provides
System, technical solution are as follows:
The spectrum calibration system of spaceborne wide spectrum camera includes halogen lamp 1, monochromator 2, three hole General integral balls 3, high-precision
Spend spectrometer 4.
The working principle of this patent is, after the light that halogen lamp 1 issues is divided by monochromator 2, is emitted spectral resolution
Monochromatic light optionally greater than 1nm, monochromatic light enters three hole General integral balls 3, from other after the integrated ball internal modulation of monochromatic light
Two holes transmit uniform light, and the radiance of one of light-emitting window is measured with high-precision spectrometer 4, with wide spectrum camera
5 pairs of another light-emitting window imagings, respectively with high-precision spectrometer collection terminal 6 and the record radiation of wide spectrum camera acquisition terminal 7
Brightness data and imaging data (including dark current data), between traversal wide spectrum camera response minimum wavelength and maximum wavelength
All wavelengths acquire the radiance and imaging data of each wavelength, so the spoke of circulation realization all wave bands of wide spectrum camera
Penetrate brightness and image-forming data acquisition.According to acquired radiance data and imaging data, the spectrum of wide spectrum camera is calculated
Receptance function, calculation method are
Wherein, srfk(λ) is the spectral response functions value of wide spectrum camera kth band wavelength λ；DNk(λ) is kth wave band wave
The image signal value of long λ；DNk(λ0,k) kth band wavelength λ0,kImage signal value；BkFor the dark current of kth wave band；Lk,λIt is
The radiance of K-band wavelength X；For kth band wavelength λ0,kRadiance；Ginseng when for maximizing
Numerical value；λ0,kFor kth wave band DNk(λ)-BkCorresponding wavelength when being maximized；αkThe scale factor of (λ) kth band wavelength λ.
This patent has the beneficial effect that: monochromatic light being modulated to the uniform monochromatic light of two-way with three hole General integral balls, both
Can by the radiance spectrum in high-precision spectrometer measurement wide spectrum, and can with wide spectrum camera synchronous imaging, it is real
Both existing synchro measure, improves wide spectrum camera spectral calibration efficiency and precision.
Detailed description of the invention
Fig. 1 is a kind of measuring principle schematic diagram of spectrum calibration system suitable for spaceborne wide spectrum camera of this patent.
In figure: halogen lamp 1, monochromator 2, three hole General integral balls 3, high-precision spectrometer 4, wide spectrum camera 5, high-precision spectrometer are adopted
Collect terminal 6, wide spectrum camera acquisition terminal 7.
Specific embodiment
The embodiment of this patent is described in further detail below, but the present embodiment is not limited to this patent, it is all
Using the similar method and its similar variation of this patent, the protection scope of this patent should all be included in.
As shown in Figure 1, instrument and equipment involved in figure is installed in place, halogen lamp 1,4 and of high-precision spectrometer are opened
Wide spectrum camera 5 is preheating to equipment optimum state respectively.After the light that halogen lamp 1 issues is divided by iHR550 monochromator 2,
It is emitted the monochromatic light that high spectral resolution is optionally greater than 1nm, monochromatic light enters three hole General integral balls 3, the integrated ball of monochromatic light
Uniform light is transmitted from other two holes after internal modulation, the spoke of one of light-emitting window is measured with ASD high-precision spectrometer 4
Brightness is penetrated, another light-emitting window is imaged with wide spectrum camera 5, uses high-precision spectrometer collection terminal 6 and wide spectrum phase respectively
Machine acquisition terminal 7 records radiance data and imaging data (including dark current data), and traversal wide spectrum camera response is minimum
All wavelengths between wavelength and maximum wavelength acquire the radiance and imaging data of each wavelength, and so circulation is realized wide
The radiance and image-forming data acquisition of all wave bands of spectral coverage camera.According to acquired radiance data and imaging data,
The spectral response functions of wide spectrum camera are calculated, calculation method is
Wherein, srfk(λ) is the spectral response functions value of wide spectrum camera kth band wavelength λ；DNk(λ) is kth wave band wave
The image signal value of long λ；DNk(λ0,k) kth band wavelength λ0,kImage signal value；BkFor the dark current of kth wave band；Lk,λIt is
The radiance of K-band wavelength X；For kth band wavelength λ0,kRadiance；Ginseng when for maximizing
Numerical value；λ0,kFor kth wave band DNk(λ)-BkCorresponding wavelength when being maximized；αkThe scale factor of (λ) kth band wavelength λ.
Claims (1)
1. a kind of spectrum calibration system suitable for spaceborne wide spectrum camera, it includes that halogen lamp (1), monochromator (2), three holes are logical
With integrating sphere (3), high-precision spectrometer (4), it is characterised in that:
For the light that halogen lamp (1) issues after monochromator (2) light splitting, outgoing spectral resolution is optionally greater than the monochromatic light of 1nm,
Monochromatic light enters three hole General integral balls (3), transmits uniformly after the integrated ball internal modulation of monochromatic light from other two holes
Light measures the radiance of one of light-emitting window with high-precision spectrometer (4), goes out light to another with wide spectrum camera (5)
Mouthful imaging, respectively with high-precision spectrometer collection terminal (6) and wide spectrum camera acquisition terminal (7) record radiance data with
Imaging data, all wavelengths between traversal wide spectrum camera response minimum wavelength and maximum wavelength, acquires the spoke of each wavelength
Brightness and imaging data are penetrated, so the radiance and image-forming data acquisition of circulation realization all wave bands of wide spectrum camera.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238465A (en) * | 2018-10-10 | 2019-01-18 | 中国科学院上海技术物理研究所 | A kind of spectrum calibration system suitable for spaceborne wide spectrum camera |
| CN112146756A (en) * | 2020-09-21 | 2020-12-29 | 中国科学院长春光学精密机械与物理研究所 | Method, device and system for inverting spectral radiance of on-board lamp-panel system |
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2018
- 2018-10-10 CN CN201821640467.2U patent/CN208902265U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238465A (en) * | 2018-10-10 | 2019-01-18 | 中国科学院上海技术物理研究所 | A kind of spectrum calibration system suitable for spaceborne wide spectrum camera |
| CN112146756A (en) * | 2020-09-21 | 2020-12-29 | 中国科学院长春光学精密机械与物理研究所 | Method, device and system for inverting spectral radiance of on-board lamp-panel system |
| CN112146756B (en) * | 2020-09-21 | 2021-06-18 | 中国科学院长春光学精密机械与物理研究所 | Method, device and system for inverting spectral radiance of on-board lamp-panel system |
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