Citation

Yan B, Li J, Zhang M, Zhang J, Qiao L, Wang T. Sensors (Basel) 2019; 19(10): s19102320.

Affiliation

Key Laboratory of Advcanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan, Shanxi 030024, China. wangmiaoshou@126.com.

Copyright

(Copyright © 2019, MDPI: Multidisciplinary Digital Publishing Institute)

DOI

10.3390/s19102320

PMID

31137524

Abstract

The field of tunnel fire detection requires a Raman distributed temperature sensor (RDTS) with high-accuracy and visual localization. A novel temperature demodulation method to improve the temperature measurement accuracy of the RDTS systems is presented. This method is based on the optical dynamic difference compensation algorithm, which can eliminate the optical power fluctuation. In addition, the visual localization technology is presented by using the longitudinal lining model (LLM) of a three-dimensional (3D) temperature display, which enhances the engineering application of RDTS in tunnel fire detection. Experimental results indicate that the temperature measurement accuracy is optimized from 7.0 °C to 1.9 °C at the sensing distance of 18.27 km by using the presented method. We provide a solution for temperature field monitoring as well as fire visual localization of the tunnel through RDTS systems.

Language: en

Keywords

Raman distributed fiber sensor; optical dynamic difference compensation; tunnel fire detection; visual localization