Fiber optic chemical sensor with modified cladding refractive index

Huayu Bao; Tingyun Wang

doi:10.1117/12.636113

5 December 2005 Fiber optic chemical sensor with modified cladding refractive index

Huayu Bao, Tingyun Wang

Proceedings Volume 6019, Passive Components and Fiber-based Devices II; 60191E (2005) https://doi.org/10.1117/12.636113
Event: Asia-Pacific Optical Communications, 2005, Shanghai, China

Abstract

We report a miniature optical fiber chemical sensor that consists of a fused-biconical single-mode optic fiber coupler. The absorption of the evanescent wave changes when the waist cladding refractive index n₂ is slightly modified. Consequently, the coupling visibility also changes. By putting the device in the water polluted, the trace amounts of chromium and nitrite in water can be detected. The coupler fabrication and design of the chemical sensor are described. The performance and characteristic of this system clearly establish the usefulness of the technique for detecting very low concentrations of the dissolved contaminants. And the sensor has shown preferable sensitivity and time response.

Citation Download Citation

Huayu Bao and Tingyun Wang "Fiber optic chemical sensor with modified cladding refractive index", Proc. SPIE 6019, Passive Components and Fiber-based Devices II, 60191E (5 December 2005); https://doi.org/10.1117/12.636113

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