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间接型光谱成像仪通常采用面阵探测器作为光电转换器件, 探测器像元间光谱响应的不一致性会导致采集到的目标光谱失真, 所以标定和修正像元间光谱响应的不一致性是提升间接型光谱成像仪光谱辐射测量精度的重要手段. 本文以干涉光谱成像仪为例, 分析了系统像元间相对光谱响应不一致对目标光谱辐射测量准确性的影响, 提出了基于傅里叶变换调制定标源的间接型光谱成像仪全系统相对光谱响应函数测量方法, 并建立了相对光谱响应函数标定的数理模型. 仿真分析结果表明, 理想无噪声时, 像元间1%的相对光谱响应不一致性会对复原光谱造成1.02%的相对误差, 经过相对光谱响应校正后, 不同行复原光谱的相对误差降至0.08%. 最后, 仿真分析了相对光谱响应不一致性在不同光谱信噪比下的校正效果. 该方法可提高间接型光谱成像仪光谱测量的准确性和一致性.In imaging spectrometers, area array detectors are usually used as photoelectric conversion devices, but the inconsistency of the spectral response among pixels can distort the collected target spectra. To improve the spectral radiometric accuracy of imaging spectrometers, calibrating and correcting the inconsistency of the spectral response among pixels is essential. The signal received by each pixel of area array detector of the indirect imaging spectrometer is usually the superposition of the target multi-spectral radiation signals or full-spectral radiation signals. Therefore, its relative spectral radiometric calibration requires measuring the spectral response of each pixel at different wavelengths on the array detector. Under the ideal conditions, the response values of each pixel in the area array detector are different, so the indirect imaging spectrometer cannot simply calibrate the relative spectral response (RSR) function between pixels by using the method of “monochromator + integrating sphere”. In this work, taking the interferometric imaging spectrometer for example, we analyze the influence of the inconsistency of the RSR among pixels on the target spectral radiation measurement accuracy, and propose a system-level RSR function measurement method for the indirect imaging spectrometer based on the Fourier transform modulation calibration source. In addition, we establish a mathematical model for calibrating the RSR function,and provide guidelines for selecting calibration system parameters such as light source, spectral resolution, and OPD sampling interval. The simulation results show that under the ideal noise-free condition, the 1% spectral response inconsistency among pixels results in a relative error of 1.02% to the recovered spectra. After RSR correction, the relative error of the recovered spectra of different rows decreases to 0.08%. Furthermore, in this work we simulate and analyse the influence of spectral signal-to-noise ratio on the calibration accuracy of the RSR function, and point out that increasing the brightness of the calibration light source, extending exposure time, and combining multi-frame interferograms can enhance RSR function calibration accuracy in practical applications. The research result can provide a theoretical basis for realizing the relative spectral radiometric calibration of indirect imaging spectrometer, which is of great significance in promoting quantitative spectral remote sensing.
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Keywords:
- indirect imaging spectrometer /
- Fourier transform spectrometer /
- relative spectral response /
- calibration
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图 2 像元间光谱响应不一致对复原光谱的影响 (a) 像元间的光谱响应曲线; (b) 不同行光谱响应不一致对复原光谱的影响
Fig. 2. Effect of the spectral response inconsistency among pixels on the recovered spectrum: (a) Spectral response curves among pixels; (b) the effect of different spectral responses on the recovered spectrum.
图 3 干涉光谱成像仪相对光谱响应函数测试系统
Fig. 3. Relative spectral response (RSR) function test system of interferometric imaging spectrometer.
图 4 理想无噪声情况下, 像元间光谱响应不一致对复原光谱的影响 (a) A点对应的相对光谱响应函数; (b) B 点对应的相对光谱响应函数; (c) A和B点误差光谱及其相对误差
Fig. 4. Influence of the spectral response inconsistency among pixels on the recovered spectrum under ideal noise-free conditions: (a) RSR function corresponding to point A; (b) RSR function corresponding to point B; (c) error spectrum for points A and B and their relative error.
图 5 干涉光谱成像仪相对光谱响应函数测量及标定流程图
Fig. 5. Flowchart of measurement and calibration of RSR function of interferometric imaging spectrometer.
图 6 理想无噪声情况下, 干涉光谱成像仪像面第256个像元的干涉图及复原光谱图(以目标点A点为例) (a)干涉图; (b)复原光谱
Fig. 6. Under ideal noiseless condition, interferograms and recovered spectrum of the 256th pixel of the interferometric imaging spectrometer (take the point A for example): (a) Interferogram; (b) spectrum.
图 7 理想无噪声情况下, $ {S}_{{\mathrm{p}}{\mathrm{e}}{\mathrm{c}}}\left(770\;{\mathrm{n}}{\mathrm{m}}, x\right) $ 及其基线拟合效果 (a) $ {S}_{{\mathrm{p}}{\mathrm{e}}{\mathrm{c}}}\left(770\;{\mathrm{n}}{\mathrm{m}}, x\right) $; (b) 基线拟合效果
Fig. 7. Under ideal noiseless condition, $ {S}_{{\mathrm{p}}{\mathrm{e}}{\mathrm{c}}}\left(770\;{\mathrm{n}}{\mathrm{m}}, x\right) $ and its baseline fitting effect: (a) $ {S}_{{\mathrm{p}}{\mathrm{e}}{\mathrm{c}}}\left(770\;{\mathrm{n}}{\mathrm{m}}, x\right) $; (b) baseline fitting effect
图 8 理想无噪声情况下, 相对光谱响应函数的复原效果 (a) A点所对应的行像元间的相对光谱响应函数; (b) B点所对应的行像元间的相对光谱响应函数; (c) A和B点校正后的光谱及其相对误差
Fig. 8. Restoration effect of the RSR function under ideal noise-free conditions: (a) RSR function among row pixels corresponding to point A; (b) RSR function among row pixels corresponding to point B; (c) corrected spectrum of points A and B and their relative error.
图 9 SNR = 50时, 相对光谱响应函数的复原效果 (a) A点; (b) B点
Fig. 9. Restoration effect of RSR function when spectral SNR is 50: (a) Point A; (b) point B.
图 10 不同信噪比下, A和B点相对光谱响应的校正效果 (a) SNR = 50, 校正前光谱; (b) SNR = 50, 校正后光谱; (c) SNR = 50, 光谱的相对误差; (d) SNR = 100, 校正前光谱; (e) SNR = 100, 校正后光谱; (f) SNR = 100, 光谱的相对误差
Fig. 10. Correction effect of RSR of points A and B at different SNR: (a) Uncorrected spectrum at SNR = 50; (b) corrected spectrum at SNR = 50; (c) relative error of spectrum at SNR = 50; (d) uncorrected spectrum at SNR = 100; (e) corrected spectrum at SNR = 100; (f) relative error of spectrum at SNR = 100.
图 11 SNR = 50, 合并50帧干涉图后A和B点相对光谱响应的校正效果 (a) 校正前后的光谱; (b)校正前后的相对误差
Fig. 11. Correction effect of RSR of points A and B after combining 50 frames of interferograms at SNR = 50: (a) Spectra before and after correction; (b) relative error before and after correction.
表 1 干涉光谱成像仪相对光谱响应函数测试系统的仿真参数
Table 1. Simulation parameters of the RSR function measuring system for interferometric imaging spectrometer
参数 值 光谱范围/nm 458—956 剪切量 d/mm 0.68 焦距 f/mm 117 像元数 256×512 (光谱维2像元合并) 像元尺寸/μm 18 光源 氙灯 (458—700 nm)
卤钨灯 (700—956 nm)光程差采样间隔/nm 150 步数 10000 光谱分辨率/cm–1 13.33 光程差采样范围/cm –0.075—0.075 
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[1] Luo H Y, Li Z W, Wu Y, Qiu Z W, Shi H L, Wang Q S, Xiong W 2023 Remote Sens. 15 1105
Google Scholar
[2] Lassalle G, Ferreira M P, La Rosa L E C, Scafutto R D P M, de Souza Filho C R 2023 ISPRS J. Photogramm. 195 298
Google Scholar
[3] 刘文龙, 刘学斌, 王爽, 严强强 2022 物理学报 71 094201
Google Scholar
Liu W L, Liu X B, Wang S, Yan Q Q 2022 Acta Phys. Sin. 71 094201
Google Scholar
[4] Calin M A, Calin A C, Nicolae D N 2021 Appl. Spectrosc. Rev. 56 289
Google Scholar
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[6] 王建威, 李伟艳, 孙建颖, 李兵, 陈鑫雯, 谭政, 赵娜, 刘扬阳, 吕群波 2022 光谱学与光谱分析 42 2013
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Wang J W, Li W Y, Sun J Y, Li B, Chen X W, Tan Z, Zhao N, Liu Y Y, Lü Q B 2022 Spectrosc. Spect. Anal. 42 2013
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Tang Y H, Cui J, Gao H Y, Qu O Y, Duan X D, Li C X, Liu L N 2017 Acta Phys. Sin. 66 130601
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Li Z W, Xiong W, Shi H L, Wang X H, Ye H H, Wei Q Y, Qiao Y L 2014 Acta Opt. Sin. 34 27
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Xiangli B, Ji Z Y, Huang M, Wang Z H, Yuan Y 2004 Acta Opt. Sin. 33 850
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