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.
Highlights
A distributed optical fiber sensor for temperature monitoring has been invested in for the past thirty years due to its distinctive advantages of immune to electromagnetic interference, small size and resistance to ionizing radiation
Over the past thirty years, a number of advanced techniques for improving the temperature measurement accuracy of Raman distributed temperature sensor (RDTS) systems have been proposed by researchers, which includes optical pulse coding techniques [8,9,10], a differential attenuation correction system [11], Rayleigh noise cancellation technology [12] a and constant temperature control system [13]
In the the difference compensation fiber (DCF) is set to Tthe r0 via thermostatic bath (Tmb), the intensity of anti-Stokes Raman backscattered light at the point of L0 calibration stage,as: the temperature of the DCF is set to Tr 0 via Tmb, the intensity of anti-Stokes can be expressed
Summary
A distributed optical fiber sensor for temperature monitoring has been invested in for the past thirty years due to its distinctive advantages of immune to electromagnetic interference, small size and resistance to ionizing radiation It can operate safely in hazardous environment, with a fast response, corrosion resistance and is intrinsically safe [1,2,3,4]. Over the past thirty years, a number of advanced techniques for improving the temperature measurement accuracy of RDTS systems have been proposed by researchers, which includes optical pulse coding techniques [8,9,10], a differential attenuation correction system [11], Rayleigh noise cancellation technology [12] a and constant temperature control system [13]. A novel temperature demodulation method based on optical dynamic difference compensation is proposed to improve the temperature measurement accuracy for RDTS systems. The experimental and simulation results indicate that these studies provide a reliable solution for tunnel fire detection
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