Abstract
A high precision temperature calculation method of fiber-optic distributed temperature sensing system based on iteration technique is introduced.Compared with the traditional calculation methods,this iteration-based method further corrects the attenuation coefficient difference of the Raman anti-stokes wavelength and stokes wavelength in optical fiber which is temperature-sensitive,thus increases the precision of temperature measurement.It especially works well with the measurements of normal-distance,complex temperature distribution fields.The iterative formula is established by theoretical analysis,the corresponding fiber parameters are pre-measured,by programming on data processing module of the sensing system.The result shows great accordance between calculation and actual temperature distribution within the range from 0 to 90℃ along a whole fiber of 5 km.
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