We employ the in-site automated observation radiometric calibration（AORC） approach to perform vicarious calibration, which does not require the manual efforts of a field team to measure the surface conditions. By us...We employ the in-site automated observation radiometric calibration（AORC） approach to perform vicarious calibration, which does not require the manual efforts of a field team to measure the surface conditions. By using an automated test-site radiometer（ATR）, the surface radiance at any moment in time can be obtained. This Letter describes the AORC approach and makes use of data to compute top-of-atmosphere radiance and compare it to measurements from the Moderate Resolution Imaging Spectroradiometer. The result shows that the relative deviation is less than 5% and the uncertainty is less than 6.2%, which indicates that the in-site AORC maintains an accuracy level on par with traditional calibration.展开更多
Beam measurement is very important for accelerators. In this paper, modern digital beam measurement techniques based on I Q（In-phase ＆ Quadrature-phase） analysis are discussed. Based on this method and highspeed hi...Beam measurement is very important for accelerators. In this paper, modern digital beam measurement techniques based on I Q（In-phase ＆ Quadrature-phase） analysis are discussed. Based on this method and highspeed high-resolution analog-to-digital conversion, we have completed three beam measurement electronics systems designed for the China Spallation Neutron Source（CSNS）, Shanghai Synchrotron Radiation Facility（SSRF）, and Accelerator Driven Sub-critical system（ADS）. Core techniques of hardware design and real-time system calibration are discussed, and performance test results of these three instruments are also presented.展开更多
基金supported by the National “863” Program of China(No.2015AA123702)the National Natural Science Foundation of China(Nos.11204318 and61275173)
文摘We employ the in-site automated observation radiometric calibration（AORC） approach to perform vicarious calibration, which does not require the manual efforts of a field team to measure the surface conditions. By using an automated test-site radiometer（ATR）, the surface radiance at any moment in time can be obtained. This Letter describes the AORC approach and makes use of data to compute top-of-atmosphere radiance and compare it to measurements from the Moderate Resolution Imaging Spectroradiometer. The result shows that the relative deviation is less than 5% and the uncertainty is less than 6.2%, which indicates that the in-site AORC maintains an accuracy level on par with traditional calibration.
基金Supported by National Natural Science Foundation of China(11205153,10875119)Knowledge Innovation Program of the Chinese Academy of Sciences(KJCX2-YW-N27)+1 种基金the Fundamental Research Funds for the Central Universities(WK2030040029)the CAS Center for Excellence in Particle Physics(CCEPP)
文摘Beam measurement is very important for accelerators. In this paper, modern digital beam measurement techniques based on I Q（In-phase ＆ Quadrature-phase） analysis are discussed. Based on this method and highspeed high-resolution analog-to-digital conversion, we have completed three beam measurement electronics systems designed for the China Spallation Neutron Source（CSNS）, Shanghai Synchrotron Radiation Facility（SSRF）, and Accelerator Driven Sub-critical system（ADS）. Core techniques of hardware design and real-time system calibration are discussed, and performance test results of these three instruments are also presented.
