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26 September 1997 New developments in optical grating technology for machine vision and industrial sensors
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We present a number of applications of optical grating technology for use in machine vision and industrial inspection and measurement applications. The gratings are based on an array of prisms that are both very easy and very cheap to produce. Currently optical gratings are used in industry in temporal/spatial correlation systems using non-coherent white- light illumination. Such systems require either the displacement of the object or the displacement of the grating in order to achieve the time signals required for evaluation. New developments in grating manufacturing techniques and electronic signal processing now enable us to electronically simulate and generate the signals required eliminating the requirement for grating or object motion. We also present a range sensor based on a split pupil methodology upon which we are developing a multiple-channel range sensor. We also highlight some of the work we are presently pursuing in multiple-layer gratings. We are investigating the Talbot and Lau self-imaging effects with hopes of using the results to preprocess images. We have also calculated the effect of multiple Bragg planes recorded into holographic materials, which can be used to produce local image transformations. Also summarized is some of the work based on an inverted retina model of the eye which uses multi-layer gratings placed before the photoreceptors to general trichromatic separation of light and explain a number of physiological effects of vision.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Roland H. Schaefer, Jochen Schwab, and Norbert Lauinger "New developments in optical grating technology for machine vision and industrial sensors", Proc. SPIE 3208, Intelligent Robots and Computer Vision XVI: Algorithms, Techniques, Active Vision, and Materials Handling, (26 September 1997);

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