Auto-correction method for differential attenuation in a fiber-optic distributed-temperature sensor.
A novel method to improve the accuracy of fiber-optic distributed-temperature measurements derived from Raman backscatterings is presented. This method utilizes two light sources with different wavelengths, such that the wavelength of the primary source's return anti-Stokes component overlaps with the incident wavelength of the secondary light source to cancel out the nonidentical attenuations generated by the wavelength differences between Stokes and anti-Stokes. The concept is successfully verified by the experimental results obtained from several sample fibers. The correction can be made automatically and continuously without any interruptions during the whole measurement periods.
Suh
Kwang
K
SensorTran, Inc., Austin, TX 78744, USA. suh@sensortran.com
Lee
Chung
C