Simultaneous measurement of temperature and microdisplacement based on a Mach–Zehnder interferometer cascaded with a fiber Bragg grating

Abstract

An all-fiber sensor for simultaneous measurement of temperature and microdisplacement is presented and demonstrated. The sensor head is fabricated by a peanut structure Mach-Zehnder interferometer (MZI) cascaded with a fiber Bragg grating (FBG). Experimental results show that the temperature sensitivities of the MZI (dip1) and the FBG (dip FBG ) are 0.0909 and 0.0121 nm∕°C, respectively. The microdisplacement sensitivities are −0.0233 and 0.0122 nm∕μm, respectively. The simultaneous measurement of the temperature and microdisplacement is demonstrated based on the sensitive matrix. With the advantages of low cost and easy fabrication, this sensor has potential applications in security, construction, and energy.

Simplified fiber Bragg grating‐based temperature measurement system design with enhanced high signal‐to‐noise ratio

“…Since mostly physical quantities can be measured on long distance fiber optic lines, Brillouin scattering based FOS attract more attention among extrinsic fiber sensors. In intrinsic FOS, the Fresnel‐based refractive index, gas diagnostics measurements, FBG‐based temperature and strain measurements can be performed. If a short distance fiber optic cable line is used or measurement is performed in a specific location, intrinsic FOS offer more economical solutions in terms of the cost in comparison with extrinsic FOS.…”

Temperature effects of Mach-Zehnder interferometer using a liquid crystal-filled fiber

“…Thus, they are attractive for various sensing applications, including temperature [1], strain [2], displacement [3,4], and refractive index [5,6]. Among many promising photonic devices, fiber -based Mach-Zehnder interferometer (MZI) stands out because of its simplicity, compactness, relative simple fabrication and high resolution.…”