Journal
APPLIED OPTICS
Volume 58, Issue 7, Pages 1662-1666Publisher
Optica Publishing Group
DOI: 10.1364/AO.58.001662
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Funding
- China National Funds for Distinguished Young Scholars [51425505]
- Shanxi 1331 Project Key Subject Construction
- Natural Science Foundation of Shanxi Province [201801D121157, 201801D221203]
- Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi [1810600108MZ]
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In this study, a fiber-optic Fabry-Perot (FP) high-temperature pressure sensor based on sapphire direct bonding is proposed and experimentally demonstrated. The sensor is fabricated by direct bonding of two-layer sapphire wafers, including a pressure diaphragm wafer and a cavity-etched wafer. The sensor is composed of a sensor head that contains a vacuum-sealed cavity arranged as an FP cavity and a multimode optical fiber. The external pressure can be measured by detecting the change in FP cavity length in the sensor. Experimental results demonstrate the sensing capabilities for pressures from 20 kPa to 700 kPa up to 800 degrees C. (C) 2019 Optical Society of America
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