Multichannel fiber Bragg grating for temperature field monitoring

Abstract

We demonstrate a multichannel fiber Bragg grating (MC-FBG) based distributed temperature field sensor with millimeter-order spatial resolution. The MC-FBG was designed by using the layer peeling (LP) algorithm with a tailored group delay characteristic and fabricated using seamless UV-inscription. We have achieved a 21-channel MC-FBG with 0.2 nm bandwidth of each channel and 0.5 nm channel gap. The sensor was tested by using a temperature field distribution. Experimental results show that the sensor had a spatial resolution of 3 mm and could measure a maximum temperature gradient of 7.85 °C/mm.

Temperature Measurement Using Optical Fiber Methods: Overview and Evaluation

“…Figure 25 shows the FBG in the optical fiber core. The advantages of the fiber Bragg gratings include small insertion attenuation, small dimensions, 15 Journal of Sensors high reliability, and immunity to electromagnetic interference [28,65,66,[68][69][70][71][72].…”

A Sensing Device with the Optical Temperature Sensors-Based Quad-RX Module and a Security Module

“…In particular, the optical temperature sensor employs a fiber Bragg grating (FBG) sensor to collect a large number of temperature data at various points simultaneously, using multichannel grating [6,7]. In addition, the FBG sensor satisfied the required temperature accuracy of ±1 • C. The FBG sensor can detect temperature changes by linearly shifting peak wavelength by 0.01 nm when a 1 • C change occurs [8]. Therefore, the FBG sensor, which is a passive sensor and thus does not require a power supply, is not affected by electromagnetic interference (EMI) and thus can be used in electrical facilities [9,10].…”