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Terahertz spectroscopy and lattice vibrational analysis of pararealgar and orpiment

Chinese Physics B 2022年第10期31卷 384-388页

作者： Ya-Wei Zhang Guan-Hua Ren Xiao-Qiang Su Tian-Hua Meng Guo-Zhong Zhao Institute of History for the Science and Technology Inner Mongolia Normal UniversityHohhot 010022China School of Yungang Ology Shanxi Datong UniversityDatong 037009China Department of Mathematics and Physics North China Electric Power UniversityBaoding 071003China Institute of Solid State Physics Shanxi Provincial Key Laboratory of Microstructure Electromagnetic Functional MaterialsShanxi Datong UniversityDatong 037009China Department of Physics Capital Normal UniversityBeijing 100048China

Terahertz time-domain spectroscopy(THz-TDS)is an effective nondestructive and noninvasive tool for investigating sulfur-containing *** with Raman spectroscopy and vibrational mode analysis,it is significant for artifact identification and *** this work,the terahertz absorption spectra of pararealgar(As_(4)S_(4))and orpiment(As_(2)S_(3))samples mixed with polytetrafluoroethylene(PTFE)are characterized in a range from 0.2 THz to 2.2 THz,and their distinctive peaks are observed,***,qualitative analysis is also implemented by using Raman spectroscopy as a complementary *** lattice vibrations are simulated by using solid-state density functional theory(ss-DFT),illustrating different characteristic absorption peaks for specific crystalline structures and dynamic *** work provides a reliable database of sulfur-containing pigments for using the THz technology to actually analyze and diagnose cultural relics.

关键词： THz-TDS lattice vibrations solid-state density functional theory(ss-DFT) pararealgar orpiment

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Combined optical fiber interferometric sensors for the detection of acoustic emission

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Optoelectronics Letters 2008年第3期4卷 184-187页

作者： LIANG Yi-jun MU Lin-lin LIU Jun-feng YU Xiao-tao College of science Harbin Engineering University Harbin 150001 China

A type of combined optical fiber interferometric acoustic emission sensor is proposed. The sensor can be independent on the laser source and make light interference by matching the lengths of two arms,so it can be used to monitor the health of large structure. Theoretical analyses indicate that the system can be equivalent to the Michelson interferometer with two optical fiber loop reflectors,and its sensitivity has been remarkably increased because of the decrease of the losses of light energy. PZT is powered by DC regulator to control the operating point of the system,so the system can accurately detect feeble vibration which is generated by ultrasonic waves propagating on the surface of solid. The amplitude and the frequency of feeble vibration signal are obtained by detecting the output light intensity of interferometer and using Fourier transform technique. The results indicate that the system can be used to detect the acoustic emission signals by the frequency characteristics.

关键词： Acoustic emissions Acoustics Electric network analysis Fiber optics Fibers Fourier transforms Geodetic satellites Interferometers Interferometry lattice vibrations Light sources Michelson interferometers Optical fibers Optical in Acoustic emission sensors Acoustic Emission signals Fiber loop reflectors Fourier Frequency characteristics Interferometric sensors Laser sources Light energy Light intensities Operating points Optical Vibration signals

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