Recent advances towards a fiber optic sensor for nerve agent

摘要

We report advances made on the development of a fiber optic nerve agent sensor having its entire length as the sensingelement. Upon exposure to sarin gas or its simulant, diisopropyl fluorophosphate, the cladding changes color resulting inan alteration of the light intensity throughput. The optical fiber is multimode and consists of a fused-silica core and anerve agent sensitive cladding. The absorption characteristics of the cladding affect the fiber's spectral attenuation andlimit the length of light guiding fiber that can be deployed continuously. The absorption of the cladding is alsodependent on the sensor formulation, which in turn influences the sensitivity of the fiber. In this paper, data related tothe trade-off of sensitivity, spectral attenuation, and length of fiber challenged will be reported. The fiber is massproduced using a conventional fiber optic draw tower. This technology could be used to protect human resources andbuildings from dangerous chemical attacks, particularly when large areas or perimeters must be covered. It may also beused passively to determine how well such areas have been decontaminated.