Abstract
An optical-cavity-based multiwavelength sensor is
developed for object discrimination and position
finding. The working principle of this device employs
the multiple laser beam triangulation method to
determine object position in addition to its ability to
recognize them. The multiwavelength sensor employs five
different identically polarized and overlapped laser
light beams that are sequentially pulsed and launched
through a custom-made curved optical cavity to generate
multiple laser spots for each laser. The intensities of
the reflected light beams from the different spots are
detected by a high-speed area scan image sensor. The
discrimination between five different objects, namely,
brick, cement sheet, roof tile, cotton, and leather is
accomplished by calculating the slopes of the objects'
reflectance spectra at the employed wavelengths. The
object position (coordinates) are determined using the
triangulation method, which is based on the projection
of laser spots along determined angles on the objects
and the measurements of the objects' reflectance spectra
using an image sensor. Experimental results demonstrate
the ability of the multiwavelength spectral reflectance
sensor to simultaneously discriminate between different
objects and predict their positions over a 6 m range
with an accuracy exceeding 92%.
© 2011 IEEE
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