Design strategies to simplify and miniaturize imaging systems

Barrière, Florence de la; Druart, Guillaume; Guérineau, Nicolas; Taboury, Jean

doi:10.1364/ao.50.000943

Cited by 21 publications

(16 citation statements)

References 33 publications

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“…To achieve extreme compactness, several design rules can be applied: a detailed description of these design strategies can be found in a previous paper [10]. One of these strategies consists in decreasing the focal length of the optical system.…”

Section: Design Rules Of An Ultra-compact Cameramentioning

confidence: 99%

“…If the shift between adjacent channels is equal to p/2 (where p is the sampling pitch of the FPA), each channel contains its own spectral content: the sub-images can then be combined and the final processed image is sampled with an equivalent sampling pitch of p/2. The minimal number of channels which are necessary to retrieve a well-sampled image without any loss in the spectral content depends on the fill factor of the IRFPA [10]:…”

Section: Design Rules Of An Ultra-compact Cameramentioning

confidence: 99%

“…In previous work, we designed a cryogenic wafer-level camera whose total track length was only equal to 4.08 mm [7] [10]. We assessed its good quality in terms of FTM and NETD.…”

Section: Introductionmentioning

confidence: 99%

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Development of an infrared ultra-compact multichannel camera integrated in a SOFRADIR's detector Dewar cooler assembly

et al. 2015

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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 ultraminiaturized optical system with a very low additional optical and mechanical mass to be cooled. By this way, the cooldown 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.

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Section: Design Rules Of An Ultra-compact Cameramentioning

confidence: 99%

Section: Design Rules Of An Ultra-compact Cameramentioning

confidence: 99%

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Development of an infrared ultra-compact multichannel camera integrated in a SOFRADIR's detector Dewar cooler assembly

et al. 2015

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“…Equation (17) shows the effect of decreasing aberrations with downscaling of the lens [14] and the wellknown rule that a conic constant of k −1∕n 2 results in minimum on-axis RMS spot size [15], which can be deduced from examining the first term of Eq. (17).…”

Section: System Designmentioning

confidence: 99%

Ultraslim fixed pattern projectors with inherent homogenization of illumination

et al. 2011

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For a given illumination source brightness, the transmitted flux of common single-aperture projection optics scales with all three system dimensions, thus preventing the realization of slim devices along with a high lumen output. In this article we introduce a multichannel approach, called "array projector," which breaks this constraint, thus enabling the realization of ultraslim but high flux systems with inherent homogenization for still image content. The concept is based on regular two-dimensional arrangements of absorbing object structures and projective microlenses superposing their individual images on the screen. After deriving first-order scaling laws for the multichannel projector in contrast to common single-aperture optics, specification of system parameters is shown considering aberrations of a single-channel and collective effects of the array. The technological realization of a sample system is shown and characterized in terms of modulation transfer, homogeneity, depth of focus and flux.

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“…To overcome these requirements, optical systems with few optics have to be found [1]. The study of vertebrate and invertebrate vision offers interesting ways to design simple optical architectures [2].…”

mentioning

confidence: 99%

Infrared camera based on a curved retina

et al. 2012

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Design of miniature and light cameras requires an optical design breakthrough to achieve good optical performance. Solutions inspired by animals' eyes are the most promising. The curvature of the retina offers several advantages, such as uniform intensity and no field curvature, but this feature is not used. The work presented here is a solution to spherically bend monolithic IR detectors. Compared to state-of-the-art methods, a higher fill factor is obtained and the device fabrication process is not modified. We made an IR eye camera with a single lens and a curved IR bolometer. Images captured are well resolved and have good contrast, and the modulation transfer function shows better quality when comparing with planar systems.

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Design strategies to simplify and miniaturize imaging systems

Cited by 21 publications

References 33 publications

Development of an infrared ultra-compact multichannel camera integrated in a SOFRADIR's detector Dewar cooler assembly

Development of an infrared ultra-compact multichannel camera integrated in a SOFRADIR's detector Dewar cooler assembly

Ultraslim fixed pattern projectors with inherent homogenization of illumination

Infrared camera based on a curved retina

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