6 January 1995 Integrated optic gaseous NH3 sensor for agricultural applications
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Proceedings Volume 2345, Optics in Agriculture, Forestry, and Biological Processing; (1995); doi: 10.1117/12.198886
Event: Photonics for Industrial Applications, 1994, Boston, MA, United States
Abstract
An integrated optic sensor for monitoring NH3 volatization as related to agricultural fertilizer applications is described. The sensor is capable of monitoring NH3 levels over a range from less than 100 parts per billion by volume to levels approaching 1000 parts per million by volume. The sensor is based on a planar waveguide operating in an interferometric mode. The device functions by monitoring a refractive index change resulting from a reversible chemical reaction occurring on the waveguide surface.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Nile F. Hartman, James L. Walsh, Daniel P. Campbell, Umesh Akki, "Integrated optic gaseous NH3 sensor for agricultural applications", Proc. SPIE 2345, Optics in Agriculture, Forestry, and Biological Processing, (6 January 1995); doi: 10.1117/12.198886; http://dx.doi.org/10.1117/12.198886
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KEYWORDS
Waveguides

Sensors

Interferometers

Integrated optics

Phase shifts

Interferometry

Agriculture

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