A Fabry-Perot interferometer for simultaneous measuring temperature and strain based on sapphire-derived fiber-air

Penghao Zhang; Li Zhang; Zhongyu Wang; Shuang Chen; Zhendong Shang

doi:10.1117/12.2579994

5 November 2020 A Fabry-Perot interferometer for simultaneous measuring temperature and strain based on sapphire-derived fiber-air

Penghao Zhang, Li Zhang, Zhongyu Wang, Shuang Chen, Zhendong Shang

Author Affiliations +

Proceedings Volume 11569, AOPC 2020: Optical Information and Network; 115690E (2020) https://doi.org/10.1117/12.2579994
Event: Applied Optics and Photonics China (AOPC 2020), 2020, Beijing, China

Abstract

A sapphire-derived fiber (SDF)-air based composite Fabry–Perot interferometer (FPI) for simultaneous measurement of strain and temperature has been proposed and demonstrated. The FPI was fabricated by cascading a lead-in single mode fiber and a short section of SDF with a small air cavity left in between. The structure was inserted into capillaries and fixed by an arc fusion. The air cavity was used for strain sensing. Its strain sensitivity was improved by increasing the ratio of capillary based active length to air based interference cavity length, while its temperature sensitivity was compensated by the SDF with a well-designed length and alumina content. The SDF cavity served as a thermometer. The reflection spectrum was demodulated by tracing the wavelength shifts of the low- and high-frequency fringes, which were caused by the air-cavity and the combination of the air and SDF based cavities, respectively. A dual-parameter sensitivity matrix was introduced to realize the simultaneous measurement of strain and temperature. In the experiments, an enhanced strain sensitivity of 55.52 pm/με in the range of 0-500με and a reduced temperature sensitivity of 0.05pm/°C in the range of (20-600)°C were obtained from the lowfrequency fringe, while a strain sensitivity of 5.38 pm/με and a temperature sensitivity of 10.81 pm/°C were obtained from the high-frequency fringe.

Citation Download Citation

Penghao Zhang, Li Zhang, Zhongyu Wang, Shuang Chen, and Zhendong Shang "A Fabry-Perot interferometer for simultaneous measuring temperature and strain based on sapphire-derived fiber-air", Proc. SPIE 11569, AOPC 2020: Optical Information and Network, 115690E (5 November 2020); https://doi.org/10.1117/12.2579994

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KEYWORDS

Capillaries

Temperature metrology

Interferometers

Sensors

Single mode fibers

Silica

Cladding

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