Novel integrated-optic chemical sensor for environmental monitoring and process control

John G. Edwards

doi:10.1117/12.199669

19 January 1995 Novel integrated-optic chemical sensor for environmental monitoring and process control

John G. Edwards

Proceedings Volume 2367, Optical Sensors for Environmental and Chemical Process Monitoring; (1995) https://doi.org/10.1117/12.199669
Event: Optical Sensing for Environmental and Process Monitoring, 1994, McLean, VA, United States

Abstract

This paper describes an inexpensive point sensor for chemical detection. The sensor is based on a novel integrated optic interferometer that provides a highly stable platform for measuring low concentrations of specific chemicals in gaseous or aqueous environments. Sensing is accomplished by monitoring refractive index changes in a thin-film surface coating, with specificity for a particular chemical achieved by using a surface coating that selectively interacts with that chemical. Multiple surface coatings can be used for simultaneous detection of several chemicals. This approach has a number of key advantages: (1) it is capable of quantifying concentrations down to at least the parts-per-billion level, yet has a broad dynamic range, (2) it is rapid response (<EQ 1 second), allowing real-time detection, (3) it is fully reversible, permitting continuous measurement, (4) it neither generates nor is susceptible to environmental interference (e.g.; electromagnetic fields, radiation, corrosive chemicals), (5) it is compact (centimeter dimensions), (6) it requires minimal power (<EQ 100 milliWatts), and (7) it is low cost. Chemicals investigated to date include ammonia, benzene, toluene, chlorine, chlorine dioxide and hydrogen. Applications range from worksite and workforce monitoring to agricultural and industrial process control.

Citation Download Citation

John G. Edwards "Novel integrated-optic chemical sensor for environmental monitoring and process control", Proc. SPIE 2367, Optical Sensors for Environmental and Chemical Process Monitoring, (19 January 1995); https://doi.org/10.1117/12.199669

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KEYWORDS

Sensors

Chlorine

Integrated optics

Coating

Waveguides

Interferometers

Chemical analysis

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