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Optical Engineering

Optical sensor array in an artificial compound eye
Author(s): Shiro Ogata; Junya Ishida; Tomohiko Sasano
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Paper Abstract

Optical systems of compound eyes are of great interest in the study of micro-optics. We propose an artificial visual sensor in a model of the apposition eye of an insect. As a key component unit of the visual sensor, a sensor array consisting of 16 x 16 individual optical sensors each with a small view field is fabricated and examined. To achieve both the practical assembly and the compact size of the sensor array, a photodiode array, a glass substrate with a pinhole array, and a group of rod-type gradient-index microlenses are stacked. The optical thickness of the sensor array is 2.9 mm. Because of the low intensity of light received by the photodiode the photocurrent is amplified 107 times in current-to-voltage conversion efficiency. The fabricated sensor array produces a mosaic image with 16 x 16 pixels and eight shades of gray scale. By arranging several of these sensor arrays along a circumference, a wide-field-angle visual sensor similar to a compound eye could be realized.

Paper Details

Date Published: 1 November 1994
PDF: 7 pages
Opt. Eng. 33(11) doi: 10.1117/12.179889
Published in: Optical Engineering Volume 33, Issue 11
Show Author Affiliations
Shiro Ogata, Omron Corp. (Japan)
Junya Ishida, Osaka City Univ. (Japan)
Tomohiko Sasano, Osaka City Univ. (Japan)

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