High-precision and long-range optical fiber Fabry–Perot interferometer for high temperature measurement

Abstract

In order to solve the problem of near-field measurement of aero-engine, a novel large-range, high-precision Fabry-Perot interferometer (FPI) is developed in this paper, which is verified by high temperature experiment. Based on the principle of FPI wavelength drift and frequency spectrum drift, a double-beam interference FPI is designed. Through the analysis of the optical path difference between the two beams, the conclusion that the spectrum drifts to the long-wave direction with the increase of temperature is obtained. Moreover, through frequency spectrum analysis, the measurement error caused by the distortion of the spectrum is avoided, and it is found that the increase in temperature will cause the change in frequency spectrum. Due to the glass-type FPI temperature sensitivity is only 0.0011nm/℃, in order to improve the sensitivity, a ceramic material with higher thermal expansion coefficient was selected as the collimating tube, so that the sensitivity of the temperature sensor was as high as 0.691nm/℃ from normal temperature to 100℃. In order to meet the needs of a wide range of measurement from room temperature to 1000℃, the frequency drift method is utilized. Field experiments were carried out on the ceramic FPI at the tail spray of the aero-engine simulation platform, and the temperature response test from normal temperature to 1000℃ was completed, and the accuracy of the sensor reached 0.098%. In this paper, the principle, design, production and testing of optical fiber sensors are carried out. The developed optical fiber sensor has significance for the high temperature monitoring.

Construction of a High-Temperature Sensor for Industry Based on Optical Fibers and Ruby Crystal

“…Another positive feature is the very short response time presented by Yang et al in case of a miniature sensor that measures temperatures up to 1455 °C [ 8 ]. Wang et al proposed an ultra-compact fiber Fabry-Pérot inter-ferometric sensor sustainable up to 1100 °C [ 9 ] and Zhao et al developed a high-precision optical fiber Fabry-Pérot interferometer with excellent temperature sensitivity and accuracy up to 1000 °C [ 10 ]. Furthermore, a vibration sensors can be also based on optical principles.…”