High-Temperature Measurement of a Fiber Probe Sensor Based on the Michelson Interferometer

Abstract

In this paper, a fiber probe high-temperature sensor based on the Michelson Interferometer (MI) is proposed and experimentally verified. We used a fiber splicing machine to fabricate a taper of the single-mode fiber (SMF) end. The high order modes were excited at the taper, so that different modes were transmitted forward in the fiber and reflected by the end face of the fiber and then recoupled back to the fiber core to form MI. For comparison, we also coated a thin gold film on the fiber end to improve the reflectivity, and the reflection intensity was improved by 16 dB. The experimental results showed that the temperature sensitivity at 1506 nm was 80 pm/°C (100 °C~450 °C) and 109 pm/°C (450 °C~900 °C). The repeated heating and cooling processes showed that the MI structure had good stability at a temperature up to 900 °C. This fiber probe sensor has the advantages of a small size, simple structure, easy manufacturing, good stability, and broad application prospects in industrial and other environments.

Optical Fiber Sensors for High-Temperature Monitoring: A Review

“…High-temperature fiber-optic sensors based on MI are usually fabricated in two ways, as shown in Figure 7 . One is to couple part of the energy of the core mode into the cladding by fusing two fibers with mismatched core diameters [ 88 , 89 , 90 , 91 ] or silicon-microspheres [ 92 , 93 , 94 , 95 , 96 , 97 , 98 , 99 ]. The two optical paths transmitted along the core and the cladding of fiber are reflected by the mirror and recombined to achieve double-beam interference.…”

Application of a Multiple Regression Model for the Simultaneous Measurement of Refractive Index and Temperature Based on an Interferometric Optical System

“…These advantages relate to small size, immunity to electromagnetic interference, high sensitivities, high measurement ranges, and low cost. Specifically, interferometric optical sensors have been used to measure different parameters, as for example, temperature, refractive index, curvature, and strain [1][2][3]. Many of these sensing structures have been proposed as two-parameter optical sensors, for which one of the parameters is temperature; this is because the main fiber optic material, silica, has thermal properties.…”

A New Remote Calibration Method of Length Value Based on Optical Fiber Information Transmission

“…With the update of measuring devices and the combination of computer-aided technology, optical interferometry continued to be modernized [18]. Various devices based on optical interferometry are used to measure surface roughness [19], acceleration [20], temperature [21], and the device designed in this paper is used to achieve length measurement.…”