1. Compact Mach–Zehnder interferometer based on processed hollow-core fiber for gas pressure sensing
- Author
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Yanming Song, Fanyong Meng, Shuai Wang, Lianqing Zhu, and Yue Wu
- Subjects
Materials science ,business.industry ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Mach–Zehnder interferometer ,Cladding (fiber optics) ,01 natural sciences ,Electronic, Optical and Magnetic Materials ,010309 optics ,Interferometry ,Fiber Bragg grating ,0103 physical sciences ,Astronomical interferometer ,Optoelectronics ,Fiber ,0210 nano-technology ,business ,Refractive index ,Sensitivity (electronics) - Abstract
A Mach–Zehnder interferometer based on processed hollow-core fiber (HCF) is proposed and experimentally demonstrated for gas pressure sensing. The fiber sensor is fabricated by splicing a segment of HCF between the two coreless fibers. One end of the HCF is processed into an open cavity, which allows gas pressure of the air-core to be equivalent to that of the external environment. Gas pressure change induces refractive index change of the air-core, thus the measurement of gas pressure can be achieved by monitoring wavelength shift of the interference pattern. The proposed fiber sensor exhibits a high gas pressure sensitivity of 9.35 nm / MPa in the range from 0.1 to 0.04 MPa and a temperature sensitivity of 30 pm / ° C in the range from 30°C to 90°C. Furthermore, the fiber sensor processes the advantages of compactness, low cost, and all-fiber configuration, which makes it suitable for gas pressure measurement.
- Published
- 2019