title: Extra-thin infrared camera for low-cost surveillance applications.
abstract: We designed a cheap broadband uncooled microimager operating in the long-wavelength infrared range using only one lens at a minimal cost for the manufacturing process. The approach is based on thin optics where the device volume is small and therefore inexpensive materials can be used because some absorption can be tolerated. We have used a Fresnel lens on a thin silicon substrate. Up to now, Fresnel lenses have not been used for broadband imaging because of their chromatic properties. However, working in a relatively high diffraction order can significantly reduce chromatism. A prototype has been made for short range or indoor low-cost surveillance applications like people counting, and experimental images are presented.
authors.forename: Tatiana
authors.initials: T
authors.lastname: Grulois
authors.forename: Guillaume
authors.initials: G
authors.lastname: Druart
authors.forename: Nicolas
authors.initials: N
authors.lastname: Guérineau
authors.forename: Arnaud
authors.initials: A
authors.lastname: Crastes
authors.forename: Hervé
authors.initials: H
authors.lastname: Sauer
authors.forename: Pierre
authors.initials: P
authors.lastname: Chavel