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Proceedings Paper

Fiber optic sensor for nitrates in water
Author(s): Brian D. MacCraith; J. Maxwell
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Paper Abstract

Recent emphasis on compliance with national and EC directions on water quality has created a requirement for real-time in-situ monitoring techniques such as provided by fiber optic sensing technology. Health risks associated with high concentrations of nitrate ion in drinking water demand regular monitoring of this species. Preliminary results from a simple fiber optic sensor for continuous monitoring of NO3- in water are reported. The sensor is based on the absorbance of UV-radiation in the 200nm region. Dual- or multi-wavelength referencing is used to compensate for non-measured related signal losses. Good quality UV- transmitting optical fibers enable remote operation of the device. The sensor performance is linear over the range 0-20 mgN per liter with a resolution better than 1mgN per liter. The sensor is particularly suitable for rapid on-line testing of compliance in the region of the EC guide (5.6 mgN per liter) and maximum (11.3 mgN per liter) levels. Proposed developments of this device are reported.

Paper Details

Date Published: 1 September 1991
PDF: 9 pages
Proc. SPIE 1510, Chemical and Medical Sensors, (1 September 1991); doi: 10.1117/12.47138
Show Author Affiliations
Brian D. MacCraith, Dublin City Univ. (Ireland)
J. Maxwell, Dublin City Univ. (Ireland)

Published in SPIE Proceedings Vol. 1510:
Chemical and Medical Sensors
Otto S. Wolfbeis, Editor(s)

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