Characterisation of Raman distributed temperature sensor using deconvolution algorithms

The behaviour of distributed temperature sensors based on spontaneous Raman scattering using deconvolution algorithm is studied for improvement of temperature and spatial resolution in Raman distributed temperature sensor (RDTS). The deconvolution algorithms such as Fourier deconvolution (FourD), Fourier regularised deconvolution and Fourier wavelet regularised deconvolution (FourWaRD) are investigated in this study. Numerical simulation shows that the temperature resolution is enhanced by six times using the proposed FourWaRD algorithm compared with conventional FourD algorithm. In this study, for a light source with 60 ns pulse width, a spatial resolution of 3 m is achieved using the FourWaRD algorithm. The proposed sensing system exhibits a temperature resolution of 0.45 K because of the reduction of noise. In addition, the signal to noise ratio (SNR) of proposed RDTS is realised using Indium Gallium Arsenide avalanche photo detector over a 30 km sensing range. The authors have achieved about 4 dB improvement of SNR using FourWaRD algorithm compared with FourD algorithm at a distance of 25 km for an input power of 10 dBm. The numerical simulation results indicate that the proposed deconvolution algorithms are beneficial complements for RDTS to realise accurate detection and temperature monitoring of sharp temperature variations.

[1]  Roberto Roncella,et al.  Raman-based distributed temperature sensor with 1 m spatial resolution over 26 km SMF using low-repetition-rate cyclic pulse coding. , 2011, Optics letters.

[2]  A. Minardo,et al.  Accuracy enhancement in Brillouin distributed fiber-optic temperature sensors using signal processing techniques , 2004, IEEE Photonics Technology Letters.

[3]  Masataka Nakazawa,et al.  Rayleigh backscattering theory for single-mode optical fibers , 1983 .

[4]  J. T. Kringlebotn,et al.  Oil and gas applications: Probing oil fields , 2008 .

[5]  Xuping Zhang,et al.  Development of fully-distributed fiber sensors based on Brillouin scattering , 2011 .

[6]  Dong Chen,et al.  Fiber-distributed multi-channel open-path H2S sensor based on tunable diode laser absorption spectroscopy , 2007 .

[7]  T. Newson,et al.  1.64µm pulsed source for a distributed optical fibre Raman temperature sensor , 1996 .

[8]  K. D. Souza,et al.  Significance of coherent Rayleigh noise in fibre-optic distributed temperature sensing based on spontaneous Brillouin scattering , 2006 .

[9]  G. Bolognini,et al.  Optical pulse coding in hybrid distributed sensing based on Raman and Brillouin scattering employing Fabry-Perot lasers. , 2010, Optics express.

[10]  Xue Feng,et al.  Improving spatial resolution in fiber Raman distributed temperature sensor by using deconvolution algorithm , 2009 .

[11]  Meng-Tsan Tsai,et al.  Fiber optic in-line distributed sensor for detection and localization of the pipeline leaks , 2007 .

[12]  T. Horiguchi,et al.  Optical-fiber-attenuation investigation using stimulated Brillouin scattering between a pulse and a continuous wave. , 1989, Optics letters.

[13]  J. N. Ross,et al.  Distributed optical fibre Raman temperature sensor using a semiconductor light source and detector , 1985 .

[14]  Alireza Bahrampour,et al.  Spatial resolution enhancement in fiber Raman distributed temperature sensor by employing ForWaRD deconvolution algorithm , 2011 .

[15]  Kwang Suh,et al.  Auto-correction method for differential attenuation in a fiber-optic distributed-temperature sensor. , 2008, Optics letters.

[16]  Roberto Roncella,et al.  SNR enhancement of Raman-based long-range distributed temperature sensors using cyclic Simplex codes , 2010 .