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Updated: Feb 20, 2026
Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
Published on: August 30, 2012
The Detection of Water Flow in Rectangular Microchannels by Terahertz Time Domain Spectroscopy
Yan Song1,2, Kun Zhao3,4, Jian Zuo5
1State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China. 2016316011@student.cup.edu.cn.
Abstract:
Flow characteristics of water were tested in a rectangular microchannel for Reynolds number (Re) between 0 and 446 by terahertz time domain spectroscopy (THz-TDS). Output THz peak trough intensities and the calculated absorbances of the flow were analyzed theoretically. The results show a rapid change for Re < 250 and a slow change as Re increases, which is caused by the early transition from laminar to transition flow beginning nearly at Re = 250. Then this finding is confirmed in the plot of the flow resistant. Our results demonstrate that the THz-TDS could be a valuable tool to monitor and character the flow performance in microscale structures.
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