Volatile Gas Sensing through Terahertz Pipe Waveguide
1
Department of Photonics, National Cheng Kung University, No. 1 University Road, Tainan 70101, Taiwan
2
Department of Applied Physics, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
3
Department of Photonics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
*
Authors to whom correspondence should be addressed.
Sensors 2020, 20(21), 6268; https://doi.org/10.3390/s20216268
Received: 27 September 2020 / Revised: 31 October 2020 / Accepted: 2 November 2020 / Published: 3 November 2020
(This article belongs to the Section Optical Sensors)
Gas sensing to recognize volatile liquids is successfully conducted through pipe-guided terahertz (THz) radiation in a reflective and label-free manner. The hollow core of a pipe waveguide can efficiently deliver the sensing probe of the THz confined waveguide fields to any place where dangerous vapors exist. Target vapors that naturally diffuse from a sample site into the pipe core can be detected based on strong interaction between the probe and analyte. The power variation of the THz reflectance spectrum in response to various types and densities of vapors are characterized experimentally using a glass pipe. The most sensitive THz frequency of the pipe waveguide can recognize vapors with a resolution at a low part-per-million level. The investigation found that the sensitivity of the pipe-waveguide sensing scheme is dependent on the vapor absorption strength, which is strongly related to the molecular amount and properties including the dipole moment and mass of a gas molecule.
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Keywords:
submillimeter wave; terahertz wave; anti-resonant reflection optical waveguide (ARROW); waveguide sensor; optical gas sensing
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MDPI and ACS Style
Lu, J.-Y.; You, B.; Wang, J.-Y.; Jhuo, S.-S.; Hung, T.-Y.; Yu, C.-P. Volatile Gas Sensing through Terahertz Pipe Waveguide. Sensors 2020, 20, 6268. https://doi.org/10.3390/s20216268
AMA Style
Lu J-Y, You B, Wang J-Y, Jhuo S-S, Hung T-Y, Yu C-P. Volatile Gas Sensing through Terahertz Pipe Waveguide. Sensors. 2020; 20(21):6268. https://doi.org/10.3390/s20216268
Chicago/Turabian StyleLu, Ja-Yu; You, Borwen; Wang, Jiun-You; Jhuo, Sheng-Syong; Hung, Tun-Yao; Yu, Ching-Ping. 2020. "Volatile Gas Sensing through Terahertz Pipe Waveguide" Sensors 20, no. 21: 6268. https://doi.org/10.3390/s20216268
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