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Fiber optic Raman sensor

An improved fiber optic Raman sensor (FORS) provides high sensitivity and effective rejection of Rayleigh backscatter and background Raman emissions. Multiple receiving optical fibers are arranged around a transmitting optical fiber to increase the sensitivity of the sensor to Raman emissions from an analysis sample. A Raman emission filter is coupled to the transmitting fiber for preventing output of Raman emissions from the optical fiber to the sample, and a Rayleigh line filter is coupled to the receiving optical fibers for removing Rayleigh line energy emitted by the analysis sample. Rayleigh backscatter emitted by the analysis sample is reduced by orienting the sensor at an appropriate angle with respect to the surface of the sample.
Inventors: 

Pamela A. Boss, Stephen H. Lieberman

Patent Number: 
US6028666
Patent Issue Date: 
March 22, 2000
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