Fiber optic chemical sensor for chlorocarbon measurement

Ashutosh Sharma; Oliver William Carter

doi:10.1117/12.261000

10 December 1996 Optical chemical sensor for chlorocarbon measurement

Ashutosh Sharma, Oliver William Carter

Proceedings Volume 2836, Chemical, Biochemical, and Environmental Fiber Sensors VIII; (1996) https://doi.org/10.1117/12.261000
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

A sensor for the measurement of volatile aliphatic chlorocarbons is reported based on quenching of a fluorescent indicator. Chlorocarbon vapors when in contact with the fluorescent indicator immobilized in a polymer film cause a quantitative decrease in the fluorescence intensity. The quenching is rapid and reversible for a range of chlorocarbons investigated, including carbon tetrachloride, trichloroethylene, perchloroethylene, chloroform and 1,1,1- trichloroethane. Quenching constants for the sensor ranged from 700 M^-1 (trichloroethylene) to 8500 M^-1 (perchloroethylene) allowing detection limits of 28 (mu) M (660 ppm v/v) and 2.4 (mu) M (56 ppm v/v) respectively. The sensor offers response time of ca. 100 s and recovery times, governed by diffusion of the analyte in the polymer film, are less than 100 s.

Citation Download Citation

Ashutosh Sharma and Oliver William Carter "Optical chemical sensor for chlorocarbon measurement", Proc. SPIE 2836, Chemical, Biochemical, and Environmental Fiber Sensors VIII, (10 December 1996); https://doi.org/10.1117/12.261000

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