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Ultra-miniature, Computationally Efficient Diffractive Visual-bar-position Sensor

Authors:
Mehjabin Monjur
Leonidas Spinoulas
Patrick R. Gill
David G. Stork

Keywords: Computational sensing, diffractive imager, visualbar- position sensor, lensless smart sensor

Abstract:
We describe the design and performance of an ultraminiature lensless computational sensor optimized for estimating the one-dimensional position of visual bars. The sensor consists of a special-purpose wavelength-robust optical binary phase diffraction grating affixed to a CMOS photodetector array. This grating does not produce a traditional high-quality human interpretable image on the photodetectors, but instead yields visual information relevant to the bar-position estimation problem. Computationally efficient algorithms then process this sensed information to yield an accurate estimate of the position of the bar. The optical grating is very small (120 m diameter), has large angle of view (140), and extremely large depth of field (0:5 mm to infinity). The design of this sensor demonstrates the power of end-to-end optimization (optics and digital processing) for high accuracy and very low computational cost in a new class of ultraminiature computational sensors.

Pages: 51 to 56

Copyright: Copyright (c) IARIA, 2015

Publication date: August 23, 2015

Published in: conference

ISSN: 2308-4405

ISBN: 978-1-61208-425-1

Location: Venice, Italy

Dates: from August 23, 2015 to August 28, 2015