Integrated optic gaseous NH3 sensor for agricultural applications

Nile F. Hartman; James L. Walsh; Daniel P. Campbell; Umesh Akki

doi:10.1117/12.198886

6 January 1995 Integrated optic gaseous NH₃ sensor for agricultural applications

Nile F. Hartman, James L. Walsh, Daniel P. Campbell, Umesh Akki

Proceedings Volume 2345, Optics in Agriculture, Forestry, and Biological Processing; (1995) https://doi.org/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.

Citation Download Citation

Nile F. Hartman, James L. Walsh, Daniel P. Campbell, and Umesh Akki "Integrated optic gaseous NH₃ sensor for agricultural applications", Proc. SPIE 2345, Optics in Agriculture, Forestry, and Biological Processing, (6 January 1995); https://doi.org/10.1117/12.198886

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