Optical plant sensor field-of-view determination

Steven J. Merritt; George E. Meyer; C. Lesiak; Kenneth Von Bargen

doi:10.1117/12.198881

6 January 1995 Optical plant sensor field-of-view determination

Steven J. Merritt, George E. Meyer, C. Lesiak, Kenneth Von Bargen

Proceedings Volume 2345, Optics in Agriculture, Forestry, and Biological Processing; (1995) https://doi.org/10.1117/12.198881
Event: Photonics for Industrial Applications, 1994, Boston, MA, United States

Abstract

Optical plant sensors constructed from red and near-infrared (NIR) filtered photodetector pairs were used in conjunction with the normalized difference index (NDI) to detect plants. Plants must occupy a minimum of 8% of the photodetector pair field-of-view (FOV) to be detected. Thus, knowing the size and location of the FOV is crucial. Since the NDI requires red and NIR reflectance measurements from coincident areas, it is equally important to know the coincident area of a red-NIR detector pair and its location. Reflectance measurements taken every 1 cm from a 60 cm X 60 cm surface can be graphically viewed to determine the size and location of the FOV of a plant sensor. The surface has low reflectance and contains a 20 cm X 20 cm highly reflective checkerboard pattern in the center. From individual FOVs of red-NIR pairs, the coincident area can be found.

Citation Download Citation

Steven J. Merritt, George E. Meyer, C. Lesiak, and Kenneth Von Bargen "Optical plant sensor field-of-view determination", Proc. SPIE 2345, Optics in Agriculture, Forestry, and Biological Processing, (6 January 1995); https://doi.org/10.1117/12.198881

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