Laser-stabilised real-time plant discrimination sensor for precision agriculture

Document Type

Journal Article

Publication Title

IEEE Sensors Journal

Publisher

Institute of Electrical and Electronics Engineers Inc.

Place of Publication

United States

School

School of Engineering

RAS ID

24417

Comments

Askraba S., Paap A., Alameh K., Rowe J., & Miller C. (2016). Laser-stabilized real-time discrimination sensor for precision agriculture. IEEE Sensors Journal, 16(17), 6680-6686. Available here

Abstract

A novel proximal spectral-reflectance-based plant discrimination sensor for use in selective herbicide spraying systems is developed and its dynamic outdoor performance is experimentally assessed for two plants. For plant illumination, the sensor uses a new stabilized 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 15 parallel, collimated laser beams spaced over a 230-mm span. The intensity of the reflected light from each beam is detected by a high-speed line scan image sensor. Plant discrimination is based on calculating two different normalised difference vegetation indices, and experimental results show that by improving the stability of the laser diodes, a plant discrimination rate greater than 90% can be achieved with a travelling speed of 7.5 km/h for canola and wild radish, which is a dominant weed in the canola crop field.

DOI

10.1109/JSEN.2016.2582908

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free_to_read

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