Renewable Reagent Fiber Optic Based Ammonia Sensor

Richard J. Berman; Lloyd W. Burgess

doi:10.1117/12.963190

13 February 1990 Renewable Reagent Fiber Optic Based Ammonia Sensor

Richard J. Berman, Lloyd W. Burgess

Proceedings Volume 1172, Chemical, Biochemical, and Environmental Fiber Sensors; (1990) https://doi.org/10.1117/12.963190
Event: OE/FIBERS '89, 1989, Boston, United States

Abstract

Many fiber optic based chemical sensors have been described which rely on a reagent chemistry fixed at the fiber endface to provide analyte specificity. In such systems, problems involving probe-to-probe reproducibility, reagent photolability and reagent leaching are frequently encountered. As a result, calibration and standardization of these sensors becomes difficult or impossible and thus inhibits their application for long term in situ chemical monitoring. Many of these problems can be addressed and several additional advantages gained by continuously renewing the reagent chemistry. To illustrate this concept, a fiber optic ammonia sensor is described in which the reagent is delivered under direct control to a sensing volume of approximately 400 nanoliters located at the probe tip. Using an acid-base indicator (bromothymol blue) as the reagent, the sample ammonia concentrations are related to modulations in light intensity with a lower limit of detection of 10 ppb. The sensor performance was studied with respect to reagent pH, concentration and reagent delivery rate. Compared with previous fiber optic ammonia sensors, the ability to reproducibly renew the reagent has resulted in improvements with respect to response and return times, probe-to-probe reproducibility, probe lifetime and flexibility of use.

Citation Download Citation

Richard J. Berman and Lloyd W. Burgess "Renewable Reagent Fiber Optic Based Ammonia Sensor", Proc. SPIE 1172, Chemical, Biochemical, and Environmental Fiber Sensors, (13 February 1990); https://doi.org/10.1117/12.963190

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