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Proceedings Paper

Photonic-based spectral reflectance sensor for ground-based plant detection and weed discrimination
Author(s): Arie Paap; Sreten Askraba; Kamal Alameh; John Rowe
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Paper Abstract

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 speed 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.

Paper Details

Date Published: 16 May 2008
PDF: 4 pages
Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70045K (16 May 2008); doi: 10.1117/12.786538
Show Author Affiliations
Arie Paap, Edith Cowan Univ. (Australia)
Sreten Askraba, Edith Cowan Univ. (Australia)
Kamal Alameh, Edith Cowan Univ. (Australia)
John Rowe, Photonic Detection Systems Pty. Ltd. (Australia)

Published in SPIE Proceedings Vol. 7004:
19th International Conference on Optical Fibre Sensors
David Sampson; Stephen Collins; Kyunghwan Oh; Ryozo Yamauchi, Editor(s)

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