Raman related double-wavelength light source self-correction distributed optical fiber Raman temperature sensor

Abstract

The invention discloses a Raman related double-wavelength light source self-correction distributed optical fiber Raman temperature sensor comprising a Raman related double-wavelength optical fiber pulse laser module, an integrated optical fiber wavelength division multiplexer, two optical fiber photoelectric receiving and amplifying modules, a digital signal processor, a display and intrinsic temperature measuring optical fiber, wherein the Raman related double-wavelength optical fiber pulse laser module comprises a driving power supply, an electronic switch, a main laser and a secondary laser. The Raman related double-wavelength light source self-correction distributed optical fiber Raman temperature sensor can correct random loss caused by bending or pressing and stretching temperature measuring optical fiber and optical cables which are used on site by self and overcomes temperature measuring errors caused by nonlinearity when an anti-stokes Raman signal channel is demodulated by astokes Raman reference path in a temperature measuring system. The Raman related double-wavelength light source self-correction distributed optical fiber Raman temperature sensor has low cost, simplestructure, good signal to noise ratio and high reliability and is suitable for monitoring online temperature in intermediate and short ranges of 100m-15km.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a distributed optical fiber Raman temperature sensor. Background technique [0002] In recent years, a distributed optical fiber Raman temperature sensor has been developed by using the effect of optical fiber Raman scattered light intensity modulated by temperature and the principle of optical time domain reflectance (OTDR), which can predict the temperature and the orientation of temperature changes on-site in real time, and monitor on-site It is an intrinsically safe linear temperature-sensing detector, which has been successfully applied in the fields of electric power industry, petrochemical enterprises, large-scale civil engineering and online disaster monitoring. [0003] Since the optical fiber loss in each band is different, that is, there is a spectral effect in the optical fiber loss, anti-Stokes Raman scattering light is used as the measurement temperatu...

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Problems solved by technology

[0004] However, when using temperature-measuring optical fibers and optical cables in the field, the losses caused by bending and compressive stretching of optical fibers and optical cables in various bands are different, and the size and position of bending and compressive stretching of optical fibers and optical cables are random, so it is difficult to artificially Calibration, need to adopt the method of self-calibration

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