Optical implementation of cubic-phase distribution lenses for passive infrared motion sensors

Giuseppe Antonio Cirino; Luiz Goncalves Neto; Ronaldo Domingues Mansano

doi:10.1117/12.542655

12 April 2004 Optical implementation of cubic-phase distribution lenses for passive infrared motion sensors

Giuseppe Antonio Cirino, Luiz Goncalves Neto, Ronaldo Domingues Mansano

Proceedings Volume 5405, Thermosense XXVI; (2004) https://doi.org/10.1117/12.542655
Event: Defense and Security, 2004, Orlando, Florida, United States

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).

Citation Download Citation

Giuseppe Antonio Cirino, Luiz Goncalves Neto, and Ronaldo Domingues Mansano "Optical implementation of cubic-phase distribution lenses for passive infrared motion sensors", Proc. SPIE 5405, Thermosense XXVI, (12 April 2004); https://doi.org/10.1117/12.542655

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