Abstract
Temperature is an important physical quantity in most industrial processes. Distributed temperature sensor (DTS), fiber Bragg grating (FBG), and tunable diode laser absorption spectroscopy (TDLAS) are three primary techniques for temperature measurement using fiber optic sensing and spectrum technology. The DTS system can monitor space temperature field along the fiber in real time. In addition, it also can locate a fire source using two sections of optical fibers which are placed orthogonally to each other. The FBG temperature sensor is used to measure the point temperature. The temperature sensitivity of the bare FBG is 10.68 pm/°C and the linearity is 0.99954 in the range of 30–100°C. Based on tunable diode laser absorption spectroscopy (TDLAS), two-dimensional (2D) distribution reconstructions of gas temperature are realized using an algebraic reconstruction technique (ART). The results are in agreement with the simulation results, and the time resolution is less than 1 s.
Highlights
In recent years, a variety of temperature sensors have been widely applied in petrochemical and other fields to ensure the smooth progress of production and personnel safety [1, 2]
Due to the unique advantages of immunity to electromagnetic fields, the easiness of installing wire, and remote-distributed measurement, the distributed temperature sensor (DTS) system attracts numerous studies, and a long sensing distance of >10 km has been achieved based on Raman backscattering, which can be wildly applied in safety and health monitoring of large infrastructure projects, such as warehousing and oil and gas pipelines [6–9]
The position of the fire source is situated underneath the center point of the circular shapes in the ceiling plane, which can be calculated by measuring the temperature changes with the DTS system
Summary
A variety of temperature sensors have been widely applied in petrochemical and other fields to ensure the smooth progress of production and personnel safety [1, 2]. This chapter briefly introduces temperature field measurement with optical fiber distributed temperature sensor (DTS), fiber Bragg gratings (FBG), and tunable diode laser absorption spectroscopy (TDLAS) based on the research content in our laboratory. DTS system based on Raman scattering is a kind of real-time and continuous monitoring space temperature field-sensing technology along the fiber direction [3, 4]. Tunable diode laser absorption spectroscopy (TDLAS) can detect the gas concentration, temperature, flow rate, and pressure with the advantages of fast response, high sensitivity, and undisturbed measurement. It has been widely used for the detection of temperature and temperature distribution [12].
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