1. College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China
2. Division of Optics and Lasers, National Institute of Metrology, Beijing 100029, China
3. Hangzhou Dahua Apparatus Manufacture Co., Ltd, Hangzhou, Zhejiang 311400, China
Abstract：A method for irradiance responsivity calibration and traceability of a terahertz array detector is proposed. Firstly, each pixel of the array detector is shift to scan the center of the terahertz irradiation field one by one, and then effective pixels, overheated pixels and dead pixels is discerned. The response of the effective pixels is normalize to obtain the relative irradiance response of the array detector. Secondly, the center pixel is used to measure the terahertz irradiation field. Make sure the scanning area larger than the terahertz spot size, so that the total power of the terahertz radiation is fully measured. The terahertz power response values of the central pixel and other effective pixels are obtained.Finally, a Golay Cell detector is calibrated with a standard terahertz power meter as reference, and then the traceable measurement of terahertz power is extended to microwatt-level. The integrated response value measured by the array detector is calibrated with the Golay Cell. And thus the absolute irradiance response of the array detector is obtained. The relative expanded uncertainty of the measured irradiance responsivity is 20% (k=2), and the measurement result can be traceable to the national terahertz radiant power standard.
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2021, Vol. 42 
