High-resolution frequency-domain spectroscopy for water vapor with coherent and continuous terahertz wave

被引：12
|
作者：
Ruan, Cunjun [1 ,2 ]
Kong, Deyin [1 ]
Dai, Jun [1 ]
Chen, Kanglong [1 ]
Guo, Sujie [1 ]
Wu, Xiaojun [1 ]
机构：
[1] Beihang Univ, Sch Elect & Informat Engn, Beijing 100191, Peoples R China
[2] Beihang Univ, Beijing Key Lab Microwave Sensing & Secur Applica, Beijing 100191, Peoples R China
来源：
CHINESE OPTICS LETTERS | 2019年 / 17卷 / 07期
基金：
中国国家自然科学基金;
关键词：
TRANSMISSION; SO2;
D O I：
10.3788/COL201917.073001
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
High-resolution frequency-domain spectroscopy ( FDS) is set up using a coherent and continuous wave terahertz ( THz) emitter and receiver. THz waves are generated and detected by two photomixers with two distributed feedback ( DFB) lasers. Atmospheric water vapor with different relative humidity is systematically investigated by the FDS. A high-frequency resolution of similar to 14 MHz is obtained with the help of Hilbert transformation, leading to a well resolved and distinct transmittance characterization of water vapor. Compared with conventional THz time-domain spectroscopy, the high-resolution continuous wave THz spectrometer is one of the most practical systems in gas-phase molecular sensing, identification, and monitoring.
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页数：5
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