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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 2 — Jan. 21, 2008
  • pp: 1051–1055

Photonic-based spectral reflectance sensor for ground-based plant detection and weed discrimination

Arie Paap, Sreten Askraba, Kamal Alameh, and John Rowe  »View Author Affiliations

Optics Express, Vol. 16, Issue 2, pp. 1051-1055 (2008)

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A bench prototype photonic-based spectral reflectance sensor architecture for use in selective herbicide spraying systems performing non-contact spectral reflectance measurements of plants and soil is described and experimental data obtained with simulated farming vehicle traveling speeds of 7 and 22 km/h is presented. The sensor uses a three-wavelength laser diode module that sequentially emits identically-polarized laser light beams through a common aperture, along one optical path. Each laser beam enters a multi-spot beam generator which produces up to 14 parallel laser beams over a 210mm span. The intensity of the reflected light from each spot is detected by a high-speed line scan image sensor. Plant discrimination is based on calculating the slope of the spectral response between the 635nm to 670nm and 670nm to 785nm laser wavelengths. The use of finely spaced and collimated laser beam array, instead of an un-collimated light source, allows detection of narrow leaved plants with a width as small as 12mm.

© 2008 Optical Society of America

OCIS Codes
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(280.1415) Remote sensing and sensors : Biological sensing and sensors
(110.4234) Imaging systems : Multispectral and hyperspectral imaging

ToC Category:
Remote sensing and sensors

Original Manuscript: December 7, 2007
Revised Manuscript: January 2, 2008
Manuscript Accepted: January 9, 2008
Published: January 14, 2008

Virtual Issues
Vol. 3, Iss. 2 Virtual Journal for Biomedical Optics

Arie Paap, Sreten Askraba, Kamal Alameh, and John Rowe, "Photonic-based spectral reflectance sensor for ground-based plant detection and weed discrimination," Opt. Express 16, 1051-1055 (2008)

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