11 August 2011 The design of frequency-drift insensitive terahertz transmission measurement system
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The precision of the conventional terahertz transmission measurement system with a parallel-plate sample will be reduced due to the interference effect, when the frequency of the THz source drifts. In order to solve such problem, a frequency-drift insensitive transmission measurement system composed of double-path is proposed in this paper, and an F-P interference model is built. The parameters are optimized, and the effects of the terahertz source's frequency drift on the precision of both the single- and double- path transmission measurement are analyzed and compared. The results demonstrated that such kind of measurement system could avoid the influence of the frequency-drift of the THz source, thus enhance the measurement accuracy.
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Jianjun Liu, Jianjun Liu, Wuxi Ma, Wuxi Ma, Xiuhua Fu, Xiuhua Fu, Mengen Zhang, Mengen Zhang, Zhi Hong, Zhi Hong, } "The design of frequency-drift insensitive terahertz transmission measurement system", Proc. SPIE 8195, International Symposium on Photoelectronic Detection and Imaging 2011: Terahertz Wave Technologies and Applications, 81950X (11 August 2011); doi: 10.1117/12.900587; https://doi.org/10.1117/12.900587

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