文献类型：期刊文献

英文题名：Fabry-Perot Interference Fiber Acoustic Wave Sensor Based on Laser Welding All-Silica Glass

作者：Wang, Wenhua[1]

机构：[1]Guangdong Ocean Univ, Sch Elect & Informat Engn, Zhanjiang 524088, Peoples R China

年份：2022

卷号：15

期号：7

外文期刊名：MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000782007400001)、、EI(收录号：20221511952749)、Scopus(收录号：2-s2.0-85127731958)、WOS

基金：This research was funded by "Guangdong Basic and Applied Basic Research Foundation (2019A1515010835)", "Characteristic Innovation Project of Guangdong Universities (2019KTSCX054)" and "Scientific Research Startup Foundation of Guangdong Ocean University (R19028)".

语种：英文

外文关键词：optical fiber acoustic wave sensor; sensor probe; Fabry-Perot interferometer; laser welding; silica glass

外文摘要：Due to the small difference between the thermal expansion coefficients of silica optical fiber and silica glass, they are used as probe materials of optical fiber acoustic wave sensors. According to the light absorption characteristics of a pressure-sensitive silica diaphragm and silica glass, the laser welding of an all-silica Fabry-Perot (FP) interference optical fiber acoustic wave sensor with a CO2 laser is proposed. For understanding the influence of thermal expansion of sealing air in an FP cavity and the drift of interference-intensity demodulation working point of a FP interference acoustic wave sensor, we designed a process for the laser welding of an ultra-thin silica diaphragm and sleeve and optical fiber and sleeve. The exhaust hole of the FP cavity is reserved in the preparation process, and an amplified spontaneous emission light source and a tunable optical-fiber FP filter are introduced to stabilize the working point. The sensor is tested with a 40 kHz sound vibration signal. The results show that the sound pressure sensitivity of the sensor to an acoustic source of 0.02-0.1 W/cm(2) is 6.59 mV/kPa. The linearity coefficient is 0.99975, indicating good linearity.