Development of spectral calibration technologies with ultra-high resolutions

Qian-qian, 刘倩倩 Liu; Yu-quan, 郑玉权 Zheng

doi:10.3788/co.20120506.0566

Cited by 2 publications

(1 citation statement)

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“…Hyperspectral radiometer can detect the spectrum and radiation to obtain the rich information of the ground objects, so it is widely used in atmospheric remote sensing, agriculture, forestry, geological survey and other fields [1][2][3][4] . Before the hyperspectral radiometer is put into use, spectral calibration is generally carried out to ensure the accuracy and credibility of the data obtained by the hyperspectral radiometer, which can maximize its quantitative application value [5] . However, due to the influence of environment, time and other factors, the photo and electromechanical components of hyperspectral radiometer will have physical changes, especially for the hyperspectral radiometer used in the field.…”

Section: Introductionmentioning

confidence: 99%

Research on the field hyperspectral calibration technology based on the portable calibration light source

Zhang

2023

Advanced Fiber Laser Conference (AFL2022)

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Spectral accuracy is a key technical element of field hyperspectral detection. In order to meet the spectral drift and accuracy detection requirements of the field spectrometer during the mobile and long-term measurements, the research of the field spectral calibration technology based on the portable calibration light source is carried out. The light through a halogen tungsten lamp and lenses is focused on the standard material with characteristic absorption wavelength, which has 14 characteristic absorption peaks at 400-2500nm, and the wavelength accuracy is less than 0.5nm. According to the wavelength distribution curve collected by the field spectrometer, using Gaussian and polynomial fitting, the spectral calibration and detection results can be obtained. The relative deviation with the mercury lamp spectral line is less than 1nm, which verifies the applicability and accuracy of the method. The research can be used for the fast spectral calibration from 400nm to 2500nm during the field hyperspectral measurements, which can improve hyperspectral detection accuracy and efficiency.

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Section: Introductionmentioning

confidence: 99%

Research on the field hyperspectral calibration technology based on the portable calibration light source

Zhang

2023

Advanced Fiber Laser Conference (AFL2022)

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Study on the methods of calibrating spectral line position of interference imaging spectrometer

Wei¹,

Liu²,

Yan³

et al. 2016

Acta Phys. Sin.

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The principle of interference imaging spectrometer is presented. According to the drift of recovery spectral line position, two representative methods of calibrating the laboratory spectral line position are proposed, and the calibration results and their comparative analyses are given. One method of calibration is to correct the principle, which embarks from parameter selection of interference imaging spectrometer and the analysis of the reason why the spectral line position is drifted. Aiming at the problem that the position of spectral line changes with row, the correction scheme is given to improve the accuracy of spectral line position. For four given laser wavelengths, which are 543.5 nm, 594.1 nm, 612 nm, and 632.8 nm, the root-mean-square (RMS) error of spectral line position is reduced from 28.3914 to 5.5371 after calibration. For the interferometer system which has no dispersion, the accuracy of calibration is better than the dispersion system, and can be the same at all detected wavelengths. In this article, the calibration accuracy of long wave is better than that of short wave, which is dependent on the selection of the initial correction wavelength. This method achieves a kind of universality for interference imaging spectrometer and its calibration parameters provide a convenient way to analyze the instrument indexes. Another calibration method is data processing. It makes up the deficiencies of the method mentioned above: a large number of data are needed and the effect of calibration at short wave is not good enough. The RMS error of spectral line position is reduced to 0.9178, which proves that the calibration has a really high precision. This method is simple and can correct all the detected wavelengths and spectral lines by using two united formula. Though this method is not applicable for all the interference imaging spectrometers, the idea that makes hard things simple is deserving of our attention. We can use it in many other fields. The essence of the method is to change a variable quantity into a slowly varying quantity by algorithms, and then establish the relationship between the slowly varying quantity and the standard value. This idea can always make a substantial increase in efficiency of calibration and has a satisfied accuracy. Each of the two methods has advantages and disadvantages: which method we choose to use is dependent on the effect we want to achieve, and it is better to make their combination. This study provides a theoretical and practical guidance for study, design, modulation, experiment and engineering of interference imaging spectrometers.

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Development of spectral calibration technologies with ultra-high resolutions

Cited by 2 publications

References 0 publications

Research on the field hyperspectral calibration technology based on the portable calibration light source

Research on the field hyperspectral calibration technology based on the portable calibration light source

Study on the methods of calibrating spectral line position of interference imaging spectrometer

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