Abstract
We present a novel design for an optoelectronics- based
real-time plant discrimination sensor, which enables a high signal-to-noise
ratio, and hence a low false positive rate, to be attained. The sensor employs
graded thin film coatings and a high-speed photodetector array in conjunction
with a solar spectral filter and 3-wavelength sequentially driven laser module
to generate multiple uniformly distributed laser spots of uniform optical
power distribution. Plant discrimination is achieved through the measurements
of the slope of the spectral response at discrete wavelengths as well as the
Normalised Difference Vegetation Index (NDVI). The maximisation of the optical
signal to noise ratio achieved by employing a custom designed optical band-pass
filter minimises the daylight background noise saturating the photodetectors,
thus enabling plant identification to be carried out with a background light
intensity as high as 10,000 lux without implementing any shade construction.
© 2013 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription