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.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.