28 August 2002 Fiber optic evanescent wave chromium sensor
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Proceedings Volume 4904, Optical Fiber and Planar Waveguide Technology II; (2002) https://doi.org/10.1117/12.481239
Event: Asia-Pacific Optical and Wireless Communications 2002, 2002, Shanghai, China
Abstract
In this paper, we present the details of a simple, sensitive, low cost and portable optical fiber sensor, based on evanescent wave absorption, for measuring chromium concentration in water ranging from 10ppb to 2000ppb. A plastic clad silica core (PCS) fiber with unclad middle region acts as the sensing element. The use of a super-bright green light emitting diode (LED) as light source reduces the size and cost of the system considerably. The use of a reference arm and ratio detector significantly reduces the effect of power supply fluctuations or ambient variations of the LED. The conventional methods used for the determination of chromium in water are spectrophotometric and colorimetric methods. Hence a comparative study between the present sensor and the spectrophotometric method has also been carried out. The response time of the sensor is also studied.
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P. Suresh Kumar, S. Thomas Lee, C. P. G. Vallabhan, V. P. N. Nampoori, Periasamy Radhakrishnan, "Fiber optic evanescent wave chromium sensor", Proc. SPIE 4904, Optical Fiber and Planar Waveguide Technology II, (28 August 2002); doi: 10.1117/12.481239; https://doi.org/10.1117/12.481239
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