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| iffraction and Reflection in Terahertz Radiation Spatial Distribution Measurement |
| WANG Yuan-cheng,DENG Yu-qiang |
| National Institute of Metrology,Beijing 100029,China |
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Abstract To improve the measurement accuracy of terahertz radiation spatial measurement setup, based on the detector scanning sampling setup, the impact factors existing in the terahertz radiation measurement setup are studied by using software simulation and experimental measurement. The concial reflector and terahertz absorption coating are used to reduce the influence of reflection on the measurement results, which can measure the spatial distribution of radiant power density more accurately.On this basis, the law of terahertz diffraction power density distribution with aperture is studied, and the aperture of terahertz transceiver equipment is reasonably optimized, which provides a research reference for the study of high-precision terahertz radiation spatial distribution measurement. Finally, the uncertainty of the beam width is analyzed, and the results show that the reflection in the system after eliminating the influence of reflection has little effect on the test results, the reflection introduction uncertainty is only 1.56%, and the relative standard uncertainty of the measurement system is obtained as 7.6%.
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Received: 19 May 2023
Published: 27 December 2023
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2023, Vol. 44 
