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Working principle of distributed optical fiber temperature sensor (DTS) system is introduced briefly in his paper. And factors affecting stability of DTS system are discussed. Electromagnetic interference and environmental temperature are important factors to stability of the DTS system. Metal shield is used to reduce electromagnetic interference. Temperature compensation circuit and sampling correction...
A distributed optical fiber sensor (DOFS) system with a sensing distance of 10 km was developed for applications in coal mine temperature measurement and fire alarm. The achieved temperature resolution and uncertainty are 0.1 and ±2°C, respectively. And the spatial resolution and measurement time are 3 m and 12 s, respectively.
Distributed optical fiber temperature sensor (DTS) for underground coal gasification (UCG) system using is studied in this paper. By measuring temperature of reacting mine gasification process can be controlled. Calibration of DTS and experiment result are introduced. The results show that, DTS can play an important role in UCG systems.
An optical fiber curvature sensor is fabricated by using a short section of polarization maintaining fibre as the sensing component spliced in a Sagnac loop. The sensitivity of the curvature measurement of 0.0344 m-1/pm is achieved experimentally. The propose sensor is simple and cheaper than that of photonic crystal fiber.
A simple refractive-index fiber sensor based on a tilted Bragg fiber grating interacting with multimode fiber is described. The sensor structure is formed by insertion of a small section of MMF between the single-mode fiber and the tilted Bragg fiber grating. The average reflective power in the cladding modes of the TFBG reflected a different power as the surrounding refractive index changes, while...
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