A material sensor based on differential spectroscopic absorption is proposed. The presence of a foreign material in a medium embodying the fiber sensor results in power attenuation at some particular wavelengths. This attenuation, which may be used for measuring the amount of the lossy material, is theoretically analyzed for the case of single-mode operation. A sensitivity analysis is carried out, and some design considerations are discussed.
© 1985 Optical Society of America
A. Safaai-Jazi, C. K. Jen, and G. W. Farnell, "Optical fiber sensor based on differential spectroscopic absorption," Appl. Opt. 24, 2341-2345 (1985)