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Design strategies to simplify and miniaturize imaging systems
- Appl. Opt
, 2011
"... systems ..."
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Multiple-Field Approach for Aberration Correction in Miniature Imaging Systems Based on Wafer-Level Production
"... In mobile imaging systems, the most difficult element to integrate is the objective lens. Here we present an intermediate approach between the costly traditional objectives and the low-resolution objectives inspired by the compound eyes of insects. Our multi-field approach uses a small number of opt ..."
Abstract
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In mobile imaging systems, the most difficult element to integrate is the objective lens. Here we present an intermediate approach between the costly traditional objectives and the low-resolution objectives inspired by the compound eyes of insects. Our multi-field approach uses a small number of optical channels each imaging a portion of the desired field of view. The full-field image is reconstructed digitally. The optics of each channel is kept simple for wafer-level fabrication and its size is sufficient to obtain a reasonable resolution. We present the design and fabrication of a prototype using 9 plano-convex lenses for 9 channels. Glass lenses glued on a wafer are used to image a full-field of ±40 ◦ with an f-number of 3. The images obtained shows field curvature correction. A simple image reconstruction scheme is presented. In conclusion, multi-field objectives fabricated with micro-optics technology are thin, simple to mount, robust, and easily replicated.
Modulation transfer function measurement of
, 2010
"... a multichannel optical system ..."
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Development of an infrared ultra-compact multichannel camera integrated in a SOFRADIR’s Detector Dewar Cooler Assembly
"... We present a prototype of an infrared cryogenic camera directly integrated inside an off-the-shelf SOFRADIR’s Detector Dewar Cooler Assembly (DDCA) and whose field of view is equal to 120°. Based on the co-design principle between optical design and image processing, we have designed a multichannel ..."
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We present a prototype of an infrared cryogenic camera directly integrated inside an off-the-shelf SOFRADIR’s Detector Dewar Cooler Assembly (DDCA) and whose field of view is equal to 120°. Based on the co-design principle between optical design and image processing, we have designed a multichannel camera which produces four non-redundant images on a single SCORPIO detector, with 640 x 512 pixels and a pixel pitch of 15 µm. This leads to an ultra-miniaturized optical system with a very low additional optical and mechanical mass to be cooled. By this way, the cool-down time of the camera is comparable to the one of an equivalent DDCA without an imagery function. Indeed, we obtain a cool-down time of 6 minutes with a THALES Cryogenics RM3. With a superresolution algorithm, the four images produced by the camera are combined to process a single full-resolution image with an equivalent sampling pitch equal to 7.5µm. The performances of this camera, assessed by experimental characterizations, are presented.
