The Use Dielectric-Coated Metal Hollow Fiber for Terahertz Wave metal Underground Sensors

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外文摘要：Transmission characteristics and mode structure of both metal hollow fiber and dielectric-coated metal hollow fiber for terahertz wave are studied。 Theoretical evaluation shows that the TE11 mode is dominant in metal hollow fiber and has high coupling efficiency when a linearly polarized light source is launched。 HE11 mode is mainly supported in dielectric-coated metal hollow fiber with an optimum thickness for the dielectric film。 The transmission loss of the TE11 and HE11 mode is8。4dB/m and 2dB/m respectively at the wavelength of 200μm for the hollow fibers with mm bore size。 The effects of optical constants of metals and dielectric materials on attenuation coefficient are also discussed to optimize the transmission performance of dielectric-coated metal hollow fiber。Aluminum is the best choice among the commonly-used metals based on published optical constants。 The optimum value for the refractive index of the dielectric film is 1。41。 According to the primary measuring results， polyethylene is a proper choice as its refractive index is 1。51 and it brings low absorption in terahertz waves。The use of Dielectric-Coated Metal Hollow Fiber Bragg phase-shifted fiber grating， for optical fiber and metal combine downhole drill pipe deformation temperature and strain detection underground。 Phase-Shifted Fiber Bragg Grating using photoelectric heterodyne detection frequency， the frequency range up to 10~(12)Hz， the frequency resolution of 1KHz。 LPFG， photovoltaic devices and microwave heterodyne frequency meter combination can solve the phase-shift grating sensor speed and resolution issues。

外文关键词：

optical waveguideterahertz hollow fibermode structuretransmission sensor

作者：

WANG Ke-jia、WANG Qi、WANG Yi、ZHANG Shuai

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作者单位：

Electrical Engineering and Automation School of Harbin Institute of Technology ,Harbin 150001, P.R.China

Information Engineering College of China Jiliang University

Information and Communication Engineering College of Harbin Engineering University

会议名称：

International symposium on photoelectronic detection and imaging;ISPDI 2009

会议地点：

Beijing(CN);Beijing(CN)

会议母体文献：

Terahertz and high energy radiation detection technologies and applications

页码：

738522.1-738522.12

出版时间：

2009

DOI：

10.1117/12.836001