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Absolute spectral response calibration system and calibration method for optical charge-coupled device

A charge-coupled device and spectral response technology, which is applied in the fields of testing optical performance and spectrum investigation, can solve the problems of complex calibration system structure and system composition, impact on the accuracy of calibration results, and limitations in popularity, and achieves a simple, efficient, and shortened calibration method. The effect of calibrating time and improving experimental efficiency

Pending Publication Date: 2020-02-04
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The difficulty of this calibration system and method lies in: first, the structure and system composition of the calibration system are relatively complicated, and the use of spectrometers and integrating spheres makes the overall cost of the system higher, and its popularity is limited; second, the measurement position of the optical power meter There may be a certain difference between the optical power density of the optical power density and the power density at the CCD panel. The difference is related to the size and performance of the integrating sphere. The more compact the integrating sphere may cause the greater the difference, which will have a certain impact on the accuracy of the calibration results.

Method used

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  • Absolute spectral response calibration system and calibration method for optical charge-coupled device
  • Absolute spectral response calibration system and calibration method for optical charge-coupled device
  • Absolute spectral response calibration system and calibration method for optical charge-coupled device

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Embodiment 1

[0040] like figure 2 As shown, an optical charge-coupled device absolute spectral response calibration system sequentially includes a standard integrating sphere light source, a bandpass filter wheel and a CCD12 to be calibrated along the light transmission path.

[0041] Specifically, the standard integrating sphere light source includes an integrating sphere 7 and a standard light source 6, the light emitted by the standard light source 6 enters the integrating sphere 7 through the entrance on the integrating sphere 7, and the light passes through the light outlet 8 after being diffusely reflected inside the integrating sphere 7 shoot. The standard light source 6 is a stable and continuous visible light source, such as a bromine tungsten lamp, whose spectral range covers the visible light band between 380nm and 780nm, so as to be used for calibration of the energy spectral response of the CCD12 to be calibrated at different wavelengths. At the same time, the standard light...

Embodiment 2

[0048] The same part of this embodiment and Embodiment 1 will not be described again, the difference is:

[0049] The standard light source 6 uses a stable and continuous visible light source as input, the brightness temperature is 3000K, and the spectral range covers the range of 350nm to 800nm. The diameter of the light outlet 8 of the integrating sphere is 5cm, and the power density near the light outlet 8 is 1.5w / cm 2 . According to the spectral distribution, the spectral power density distribution at the position of the light outlet 8 can be obtained, such as Image 6 shown. Filter 15 is calibrated with 6 channels, the center wavelength and bandwidth are selected as 400±40nm, 470±40nm, 540±40nm, 610±40nm, 680±40nm, 750±40nm, the transmittance curve of filter 15 is as follows Figure 7 shown.

[0050] During calibration, each channel maintains the same exposure time, and the filter wheel 11 is rotated so that the centers of the filters 15 are aligned with the centers o...

Embodiment 3

[0052] The same part of this embodiment and embodiment two will not be repeated, the difference is:

[0053] The central wavelength and bandwidth of the filter 15 are respectively 400±20nm, 470±50nm, 540±30nm, 610±40nm, 680±30nm, 750±30nm, and the transmittance curve of the filter 15 is as follows Figure 10 shown.

[0054] Obtain the spectral response function curve of the CCD12 to be calibrated according to the spectral analysis method, such as Figure 11 As shown, the black solid line is the ideal spectral response, and the black dashed line is the system spectral response after the system inverse solution. Depend on Figure 11 It can be seen that the reduction degree of the spectral response is very high, and the data reduction rate of each channel can be approximately 1. At the same time, the relative error of the spectral analysis result of the system after considering the random error of the system is 0.82%.

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Abstract

The invention relates to an absolute spectral response calibration system and calibration method for an optical charge-coupled device, and belongs to the technical field of calibration of optical charge-coupled devices. The calibration system sequentially comprises a standard integrating sphere light source, a band-pass filter disc rotating wheel and a to-be-calibrated CCD along a transmission path of light, wherein the band-pass filter disc rotating wheel comprises a plurality of filter discs. The method of spectrum unfolding by using the plurality of filter discs is utilized, so that the requirement for monochromatization of a light source system in spectral response calibration of the to-be-calibrated CCD is effectively reduced; the function of combining a spectrometer and an integrating sphere can be realized by using the combination of the plurality of filter discs, so that the structure and cost of the calibration system are simplified; and the calibration method is simple, convenient and efficient, the performance is stable and reliable, the calibration time can be shortened to a relatively large extent, and the experiment efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of calibration of optical charge-coupled devices, and in particular relates to an absolute spectral response calibration system and calibration method of optical charge-coupled devices. Background technique [0002] The optical charge-coupled device (CCD for short) has the advantages of high surface uniformity, low system noise, fast recording speed, and strong reliability. It has become the most important experimental image reading and recording equipment in the field of scientific research, often associated with optical imaging System, spectrometer, optical stripe tube and other equipment coupling to carry out precise experimental research. The absolute spectral response curve is an important characteristic of optical CCDs. Through the precise calibration of the absolute spectral response, information such as the absolute intensity of the light source and the absolute brightness of the spectrum can be obta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02G01J3/28
CPCG01J3/28G01M11/02
Inventor 张琛张惠鸽刘浩杨为明章欢王哲斌宋天明王鹏杨冬
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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