سابِق|تال

Field dissemination of the value of the quantity method of the spectroradiometer in visible-to-shortwave infrared

  • role： First author第一作者
  • Affiliation：

    Division of Metrology in Optics and Laser, National Institute of Metrology, Beijing 100029, China

  • Email：chengqt@nim.ac.cn
  • Introduction：程秋桐，研究方向为光谱辐射度定标。E-mail： chengqt@nim.ac.cn
CHENG Qiutong1,  
  • Affiliation：

    Division of Metrology in Optics and Laser, National Institute of Metrology, Beijing 100029, China

LI Ling1,  
  • Affiliation：

    Division of Metrology in Optics and Laser, National Institute of Metrology, Beijing 100029, China

DAI Caihong1,  
  • role： Corresponding author通信作者
  • Affiliation：

    Division of Metrology in Optics and Laser, National Institute of Metrology, Beijing 100029, China

  • Email：wuzf@nim.ac.cn
  • Introduction：吴志峰，研究方向为光谱辐射度色度定标。E-mail： wuzf@nim.ac.cn
WU Zhifeng1*,  
  • Affiliation：

    Key Laboratory of Quantitative Remote Sensing Information Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

GAO Caixia2,  
  • Affiliation：

    Division of Metrology in Optics and Laser, National Institute of Metrology, Beijing 100029, China

HE Sijie1,  
  • Affiliation：

    Division of Metrology in Optics and Laser, National Institute of Metrology, Beijing 100029, China

WANG Yanfei1

ملخص

Field spectroradiometers need to be traced back to a unified benchmark, namely, the international system (SI) of units, to ensure the accuracy and consistency of different field spectroradiometers. Considering that reports focusing on the accuracy of field radiometric calibration of spectroradiometers are lacking, this study investigates the field dissemination of the value of the quantity method.Uncertainty evaluation methods, such as the model of the relationship between wavelength and spectral radiance, the stray light correction model, and the temperature correction model, are provided for the transfer spectroradiometer. Then, the radiometric quantity is transferred from the laboratory measurement standard to the transfer spectroradiometer and then to the field instruments. By analyzing the uncertainty components in the whole process, a laboratory-field dissemination method of the value of the quantity chain is established, and the field spectroradiometer is traced to the SI unit uninterruptedly. In accordance with the uncertainty propagation law, the uncertainties of the transfer spectroradiometer and field spectroradiometer are obtained. Experimental results show that the uncertainty of the transfer spectroradiometer is 1.7%—2.3% (k = 1) from 380 nm to 2400 nm, and the uncertainty of the field spectroradiometer is 1.9%—2.5% (k = 1) from 380 nm to 2400 nm.The paper systematically introduces the method of field dissemination of the value of the quantity method. During the field calibration process, the uncertainty and characteristics of the standard transfer spectroradiometer are investigated. By analyzing the field calibration uncertainty in the whole process, the field spectroradiometer can be traced back to the international equivalent primary standard in the laboratory. The method is helpful for the cross verification of different types of field instruments at different sites and ensures the consistency of multiple field verification tests. It can also be used to calibrate satellite optical loads with high accuracy in the future.The field dissemination of the value of the quantity method can be divided into two partscalibration of a transfer spectroradiometer and field radiometric calibration. The influencing factors must be considered when a transfer spectroradiometer is used to calibrate the field spectroradiometer because of the differences between the laboratory and the actual site, such as relative spectral, radiation level, and temperature and humidity differences. Mathematical models are established to quantify the influence of various parameters on the spectral measurement accuracy, and a stray light correction model is built using the laser and filter method to correct the stray light caused by the relative spectral difference. The integrating sphere light source addition method is used to evaluate the nonlinearity at different radiation levels. In addition, whether spectral responsivity and detector temperature have a one-to-one correspondence is analyzed, and a temperature correction model is built according to the variation trend of spectral responsivity. After measuring and correcting the influence of the difference between the laboratory and actual site, the transfer spectroradiometer is utilized to transfer the radiometric quantity to the field spectroradiometer by using the symmetrical placement and exchange measurement method.

مفهوم

field dissemination of the value of quantity;stray light correction model;temperature correction model;exchange measurement;Uncertainty

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