Optics: measuring and testing – Of light reflection – With diffusion
Patent
1989-03-13
1991-09-03
McGraw, Vincent P.
Optics: measuring and testing
Of light reflection
With diffusion
356 72, 356402, G01N 2149, G01N 2184, G01N 3324
Patent
active
050447564
ABSTRACT:
An apparatus for attachment to a vehicle for sensing the organic matter content of soil at a soil scene as it is moved through the soil by the vehicle has a probe including a housing, a light source and a light sensor. The light sensor senses the light reflected from the soil scene and produces an output signal which is related to the organic matter content of the soil at the soil scene. The housing is attached to the vehicle so that as it is moved through the soil the soil scene that is observed by the light sensor is beneath the surface of the surrounding soil and the housing shields the soil scene from ambient light. The apparatus also includes a processor which processes the signal from the light sensor using data predetermined from a particular landscape which includes the soil to be sensed.
REFERENCES:
patent: 4266878 (1981-05-01), Auer
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J. A. Shields, E. A. Paul, R. J. St. Arnaud and W. K. Head, "Spectrophotometric Measurement of Soil Color and Its Relationship to Moisture and Organic Matter", Can. J. Soil Sci., vol. 48, pp. 271-280 (1968).
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Gaultney Lawrence D.
Schulze Darrell G.
Shonk Jason L.
Van Scoyoc George E.
McGraw Vincent P.
Purdue Research Foundation
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