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<title>Integrated optic gaseous NH<formula><inf><roman>3</roman></inf></formula> sensor for agricultural applications</title>
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1995
Year
Sensor ApplicationEnvironmental MonitoringEngineeringOptical TestingEducationFiber OpticsSensing (Management Information Systems)Sensor TechnologyPlanar WaveguideSensing (Sensor Engineering)Optical PropertiesCalibrationInstrumentationOptical SystemsPlanar Waveguide SensorAmmoniaAgricultural ApplicationsOptical SensorsSpecification (Technical Standard)Agricultural Fertilizer ApplicationsSensorsOptic SensorTechnologyOptical Sensor
An integrated optic sensor for monitoring NH<SUB>3</SUB> volatization as related to agricultural fertilizer applications is described. The sensor is capable of monitoring NH<SUB>3</SUB> 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.