Lightweight uncooled TWS equipped with catadioptric optics and microscan mechanism

Bergeron, Alain; Jerominek, Hubert; Doucet, Michel; Lagacé, François; Desnoyers, Nichola; Bernier, Sophie; Mercier, Luc; Boucher, Marc-André; Jacob, Michel; Alain, Christine; Pope, Timothy D.; Laou, Philips

doi:10.1117/12.665523

Cited by 6 publications

(2 citation statements)

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“…INO has developed a LWIR HRXCAM platform where a microscan is integrated into an athermalized catadioptric optics [2] [3][4] [5]. The microscan installed in the objective allows for a compact, lightweight and easy to scan system.…”

Section: Introductionmentioning

confidence: 99%

Catadioptric optics for high-resolution terahertz imager

et al. 2012

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INO has developed infrared camera systems with microscanning capabilities in order to increase image resolution. It has been shown in previous works that the image quality may be improved even if the pixel pitch is smaller than the point spread function. [1] This paper introduces a catadioptric optics system with fully integrated microscan for improved resolution in the THz band. The design, inspired by the INO's HRXCAM infrared camera core and adapted for terahertz wavelengths, includes two mirrors and one refractive element. It has a 11.9 degree full field of view and an effective F-number of 1.07 over a wide spectral range, from 100 µm to 1.5 mm wavelength. This diffraction limited optics is used to provide video rate high quality THz images. A THz camera, with 160 x 120 pixel and 52 µm pitch detector, is combined with the microscan objective to provide a 320 x 240 pixel image with a 26 µm sampling step.Preliminary imaging results using a THz illumination source at 118 µm wavelength are presented. A comparison between standard and microscanned images is also presented.

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Section: Introductionmentioning

confidence: 99%

Catadioptric optics for high-resolution terahertz imager

et al. 2012

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“…Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/11/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx INO has developed a flexible electronic camera core on which both the infrared and THz platforms are built [1,[3][4][5]. …”

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confidence: 99%

Resolution capability comparison of infrared and terahertz imagers

et al. 2011

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Infrared and terahertz are two imaging technologies that differ fundamentally in numerous aspects. Infrared imaging is an efficient passive technology whereas terahertz technology is an active technology requiring some kind of illumination to be efficient. What's more, the detectors are also different and yield differences in the fundamental physics when integrated in a complete system. One of these differences lies in the size of the detectors. Infrared detectors are typically larger than the infrared wavelengths whereas terahertz detectors are typically smaller than the wavelength of illumination. This results in different constraints when designing these systems, constraints that are imposed by the resolution capabilities of the system.In the past INO has developed an infrared imaging camera core of 1024x768 pixels and tested some microscanning devices to improve its sampling frequency and ultimately its resolution. INO has also engineered detectors and camera cores specifically designed for active terahertz imaging with smaller dimensions (160x120 pixels). In this paper the evaluation of the resolution capabilities of a terahertz imager at the pixel level is performed. The resolution capabilities for the THz are evaluated in the sub-wavelength range, which is not actually possible in the infrared wavebands. Based on this evaluation, the comparison between the resolution limits of infrared detectors and the terahertz detectors at the pixel level is performed highlighting the differences between the wavebands and their impact on system design.

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