Studies on Signal-to-Noise Ratio Standard for THz Time-Domain Spectroscope
LI Meng1, 2, HE Ming-xia1, 2*, QIN Rui1,2
1. Centre for Terahertz Waves, Tianjin University, Tianjin 300072, China 2. State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
Abstract：Terahertz time-domain spectroscopy (THz-TDS) is an important part of THz technology, but its low scan speed always becomes the bottleneck. In this article signals of TDS system under different scan speed were compared. The signal quality was getting worse while scan speed was increasing, and the time constant of lock-in amplifier plays an important role in the process. The main noise was found introduced from the circuit according to the experiment results.
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