Method and apparatus for auto-correcting the distributed temperature sensing system
OwnerChung Leeinventor
Life of this patent
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Abstract
System and method for correcting the potential errors occurring in a fiber optic temperature measurement system are disclosed. In one respect, a dual light sources configuration is provided. The primary light source may illuminate a sensing fiber, and an Anti-Stokes band may be detected. The secondary light source may illuminate a sensing fiber, and a Rayleigh band may be detected, where the Rayleigh band is substantially wide enough to cover the Anti-Stokes band of the primary light source. A ratio between these Anti-Stokes and the Rayleigh bands may be used to measure the temperature and undesired errors due to the perturbations falling on the sensing fiber is continuously corrected.
Claims16
A method for automatically correcting a temperature measurement in a distributed system comprising:
- introducing a first light signal into a fiber optic system from a first light source;
- introducing a second light signal into the fiber optic system from a second light source;
- selecting said first and second light sources alternately and consecutively;
- monitoring both said first and second light signals the fiber optic system;
- and
- automatically correcting the temperature measurement of the system, said automatic correcting selected from the group comprising:
- comparing the ratio of said first light signal's Anti-Stokes band to said second light signal's Rayleigh band;
- and
- compensating for instantaneous fluctuations in said first and second light signals.
A system for automatically correcting temperature measurement comprising:
- a fiber optic cable;
- a first light source optically connected to said fiber optic cable, said first light source producing a first light signal;
- a second light source optically connected to said fiber optic cable, said second light source producing a second light signal comprising:
- a center wavelength located in the middle of the first light signal's Anti-Stokes band plus Rayleigh band;
- a spectral bandwidth broader than said first light signal's Anti-Stokes band plus Rayleigh band;
- and
- an amplitude comparable to said first light signal's Anti-Stokes intensity;
- and
- a light detecting device optically connected to said fiber optic cable for monitoring light signals produced by said first and second light sources.
Dependencies are inferred from the claim text.