Precise spectral calibration for hyperspectral imager

ZHENG Yu-quan

doi:10.3788/OPE.20101811.2347

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Precise spectral calibration for hyperspectral imager

Article | 更新时间：2020-08-12

- Precise spectral calibration for hyperspectral imager
- Optics and Precision Engineering Vol. 18, Issue 11, Pages: 2347-2354(2010)
- 作者机构：
  
  中国科学院长春光学精密机械与物理研究所,吉林长春,130031
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20101811.2347
  CLC： TP73;TH744.1
- Received：05 July 2010，
  
  Revised：26 July 2010，
  
  Published Online：25 November 2010，
  
  Published：25 November 2010
- 稿件说明：
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郑玉权. 超光谱成像仪的精细光谱定标[J]. 光学精密工程, 2010,18(11): 2347-2354

ZHENG Yu-quan. Precise spectral calibration for hyperspectral imager[J]. Editorial Office of Optics and Precision Engineering, 2010,18(11): 2347-2354
郑玉权. 超光谱成像仪的精细光谱定标[J]. 光学精密工程, 2010,18(11): 2347-2354 DOI： 10.3788/OPE.20101811.2347.

ZHENG Yu-quan. Precise spectral calibration for hyperspectral imager[J]. Editorial Office of Optics and Precision Engineering, 2010,18(11): 2347-2354 DOI： 10.3788/OPE.20101811.2347.

摘要

为了精细标定棱镜色散超光谱成像仪1 02480光谱像元的中心波长和响应带宽

建立了一套光谱定标装置

提出了实现1 nm光谱定标精度的定标方法。首先

介绍了产生谱线弯曲与谱线倾斜的原因

确定了精细光谱定标的方法和数据处理算法;然后

利用光谱定标装置测定了全部光谱响应像元的离散单色光响应值

利用高斯方程拟合了相对光谱响应曲线;最后

建立了中心波长矩阵表和带宽矩阵表

采用多项式拟合算法确定了空间视场像元的色散方程和光谱通道谱线弯曲方程

实验测定了温度变化谱线漂移结果。另外

还对光谱定标精度对辐射定标精度的影响进行了分析。光谱定标结果表明:超光谱成像仪的光谱定标精度达到了1 nm

各谱段带宽平均为8.75 nm;色散方程及谱线弯曲与设计结果相符

谱线弯曲值为14~19 nm

平均值为17 nm;1 nm的定标精度对辐射定标精度的影响分别小于1%(3000 K黑体)和0.25%(6000K黑体)

满足超光谱成像仪1 nm光谱定标精度的要求。

Abstract

In order to precisely calibrate the center wavelength and bandwidth of 102480 spectral pixels of a prism-dispersive hyperspectral imager

a spectral calibration facility is established

and a spectral calibration method to realize 1 nm wavelength accuracy is presented.Firstly

the spectral line bend and spectral line tilt are introduced

and the precise spectral calibration method and data processing algorithms are determined. After the discrete monochrome response values of all spectral pixels are measured with the spectral calibration facility

the relative spectral response curves are fitted with Gauss function. Finally

the center wavelength matrix and bandwidth matrix are established

the dispersive equations of different spatial pixels and the spectral line bend equations of different spectral channels are given with a polynomial fitting

and the spectral line deviation with circumstance temperature variation is experimentally measured. Furthermore

the effect of spectral calibration accuracy on the radio metric calibration accuracy is discussed.Experimental results indicate that the spectral calibration accuracy reaches 1 nm

and the average bandwidth of all pixels is 8.75 nm. The dispersive equation and the spectral line bend are coincident with design values well

in which the spectral line bend value is between 14 and 19 nm and the average is 17 nm.Moreover

the 1 nm center wavelength accuracy can cause less than 1% radiometric calibration deviation for a 3 000 K blackbody calibration source

and 0.25% for a 6 000 K blackbody calibration source.These results can satisfy the spectral calibration requirements of 1 nm wavelength accuracy.

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Keywords

references

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