Fast catadioptric optics with large field of view

Blanchard, Nathalie; Doucet, Michel; Desnoyers, Nichola; Noc, Loïc Le; Bergeron, Alain

doi:10.1117/12.826013

Cited by 3 publications

(3 citation statements)

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“…System specifications are summarized in Table 1. For a complete description of the optical module and for more details on system performances, refer to [2][3]. Athermal range -30 0 C to +60 0 C with focus -30 0 C to +60 0 C with focus adjustment…”

Section: System Descriptionmentioning

confidence: 99%

Review of a high resolution catadioptric optical module

et al. 2010

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The alignment method of a fast catadioptric optical module with very large field of view is presented in this paper. The module is made of three aspheric optical components: a primary mirror, a secondary mirror and a field lens. To achieve the 22.6 degrees field of view, the secondary mirror makes a large obscuration requiring an F/0.75 working f-number to achieve the effective F/1.05. The catadioptric optical module was integrated with the IRXCAM-640 uncooled camera module made by INO. System spatial resolution is improved with the use of a 4-position microscan mechanism.

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Section: System Descriptionmentioning

confidence: 99%

Review of a high resolution catadioptric optical module

et al. 2010

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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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“…The specifications are summarized in Table 1. [2][3][4][5][6] The optics are very compact, but still provide enough room to insert a shutter for calibration purposes. Achieving good optical performance while allowing enough space for the shutter was a challenge for the optical design, as was reducing the effective thickness of the shutter.…”

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confidence: 99%