Distributedoptical fiber temperature sensor (DOFTS) system applied to temperature automatically alarm of coal-mine and tunnel

摘要

The DOFTS system that has appleid to temperature automatically alarm systme fo coal mine and tunnel has been researched. It is a real-time, on line and multi-polint measurement system. The wavelength of LD is 1550nm, on the 6km optical fiber, 3000 points temperature signal is sampled and the spatial position is certain. temperature measured region: -50 deg C --100 deg C; measured uncertain value: +- 3 deg C; temperature resolution: 0.1 deg C; spatial resolution: <5cm(optical fiber sensor probe); <8m(spread optical fiber); measured time: <70s. In the paper, the operated principles, underground test, test content and practical test results have been discussed.