Performance improvements in Raman distributed temperature sensor

Distributed optical fiber temperature sensor using only anti-Stokes Raman scattering light in a loop configuration

In this paper we demonstrate distributed Raman temperature sensing (RDTS) in a loop scheme employing anti-Stokes light intensity only. Using a single-channel receiver and anti-Stokes traces measured in loop configuration, we implement RDTS with inherent compensation of fiber wavelength-dependent losses, as well as local external perturbations. Experimental results show a signal-to-noise ratio e...

Hybrid Raman/fiber Bragg grating sensor for distributed temperature and discrete dynamic strain measurements.

We propose and experimentally demonstrate a hybrid fiber optic sensing technique that effectively combines Raman optical time domain reflectometry and in-line time-division-multiplexing for fiber Bragg grating (FBG) dynamic interrogation. The highly integrated proposed scheme employs broadband apodized low reflectivity FBGs with a single narrowband optical source and a shared receiver block, al...

Distributed temperature sensor system based on Raman scattering using correlation-codes

Introduction: Fibre-based distributed temperature sensor (DTS) systems have been intensively studied for several years, because of the advantages they can provide compared to conventional sensors, and to optical fibre multiplexed sensor systems (such as grating-based sensors); most common applications include pipeline monitoring (for oil and gas transportation), oil well monitoring and power ca...

Reflectometry Based Quasi - distributed High Temperature Sensor

Pirani Pressure Sensor with Distributed Temperature Sensing

A Pirani pressure sensor is based on the fact that the thermal conductivity of a gas is dependent on the pressure. The structure presented in this paper consists of a heated microbeam, which is placed above a v-groove in a heat sink. The temperature distribution along the microbeam is a measure for the thermal conductivity of the surrounding gas. Measuring the temperature distribution instead o...