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Proceedings Paper

Optical implementation of cubic-phase distribution lenses for passive infrared motion sensors
Author(s): Giuseppe Antonio Cirino; Luiz Goncalves Neto; Ronaldo Domingues Mansano
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Paper Abstract

A cubic-phase distribution is applied in the design and fabrication of inexpensive lenses for passive infrared motion sensors. The resulting lenses produce a point spread function (PSF) capable to distinguish the presence of humans from pets by the employment of the so-called wavefront coding method. The cubic phase distribution used in the design can also reduce the optical aberrations present on the system. This aberration control allows a low tolerance in the fabrication of the lenses and in the alignment errors of the sensor. The lens was manufactured on amorphous hydrogenated carbon thin film, by employing well-known micro fabrication process steps. The optical results demonstrates that the optical power falling onto the detector surface is attenuated for targets that present a mass that is horizontally distributed in space (e.g. pets) while the optical power is enhanced for targets that present a mass vertically distributed in space (e.g. humans).

Paper Details

Date Published: 12 April 2004
PDF: 10 pages
Proc. SPIE 5405, Thermosense XXVI, (12 April 2004); doi: 10.1117/12.542655
Show Author Affiliations
Giuseppe Antonio Cirino, Portas e Portoes Automatica Ltda. (Brazil)
Luiz Goncalves Neto, Univ. de Sao Paulo (Brazil)
Ronaldo Domingues Mansano, Univ. de Sao Paulo (Brazil)

Published in SPIE Proceedings Vol. 5405:
Thermosense XXVI
Douglas D. Burleigh; K. Elliott Cramer; G. Raymond Peacock, Editor(s)

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