Silicon and sapphire crystal materials have excellent thermal stability and heat transfer characteristics, making them widely used in the field of high temperature sensing. Based on the optical properties of silicon and sapphire crystals, we have fabricated two different kinds of extrinsic optical fiber Fabry-Perot high temperature sensors and matching signal transmission waveguides to investigate the effects of different temperature-sensitive materials on the response speed of the high temperature sensors. The first kind of sensor uses a C-plane double-sided polished sapphire wafer as the temperature sensing element. Heterogeneous fiber splicing between sapphire fiber and multimode silica fiber is realized for long-distance transmission of interference signals. The second kind of sensor uses a single-crystal silicon wafer as the temperature sensing element. Single-mode optical fiber of silicon dioxide is used as transmission waveguide. A series of high temperature assault experiments for heating and cooling processes from room temperature to 800°C, were performed on the two kinds of sensors to investigate their difference on the temperature response speed. In the experiment, the response time of the sapphire fiber high temperature sensor in the heating section is 38s, and the response time in the cooling section is 31.6s. The response time of the silicon-based fiber high temperature sensor in the heating section is 35.8s, and the response time in the cooling section is 28.2s. Due to the higher thermal conductivity of silicon, the silicon-based fiber sensor responded 5.78% faster than the sapphire fiber sensor in the temperature rise experiment and 10.85% faster than the sapphire fiber sensor in the temperature drop experiment
We propose a miniaturized fiber optic fabry-perot pressure measuring system, which consists of two parts: ultra-high pressure sensor with embedded MEMS Fabry-Perot cavity and miniaturized phase demodulation system, for marine pressure measurement. The ultra-high pressure sensor have been analyzed and proved to meet the requirements of the full ocean pressure measurement by analyzing mechanical and optical characteristics. In order to meet the application demands of marine pressure measurement, the pressure fatigue test and hydrostatic pressure test have been carried out. The test results show that the pressure measuring system has a stable response relationship between the absolute phase and pressure in the range of 2–120 MPa, and no significant changes was found neither in four consecutive months of ultra-high pressure tests. The repeated error of system is less than 0.012MPa at 60MPa. The miniaturized measuring system can be applied to the ocean profiling measurement plan named the Argo plan.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.