Mr. Minyi Xu Profile

Minyi Xu

at Soochow Univ

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Proceedings Article | 31 October 2016 Paper

Design of refractive fore-optics with wide field of view and waveband for miniature imaging spectrometer

Jingchao Mao, Minyi Xu, Qinghan Liu, Weimin Shen

Proceedings Volume 10021, 100211S (2016) https://doi.org/10.1117/12.2246597

KEYWORDS: Spectroscopy, Imaging systems, Remote sensing, Monochromatic aberrations, Short wave infrared radiation, Unmanned aerial vehicles, Manufacturing, Lenses, Glasses, Chromatic aberrations

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With the development of unmanned airborne vehicle (UAV) remote sensing technology, miniature high-resolution imaging spectrometers are greatly needed. In order to improve remote sensing efficiency and get wider coverage, it’s urgent to design and develop fore-optics with wide field of view and waveband for imaging spectrometer. As the refractive system has no central obscuration and it’s conducive to manufacture and assemble, so it’s used for our fore-optics. The key is the correction of secondary spectrum of systems working in broad waveband and meeting the requirement of imagery telecentricity to be appropriate for linear pushbroom imaging system. Suitable glasses are selected on the Glass Map, from where each glass has an Abbe number υ_d and Partial Dispersion. Based on the theory of Gaussian Optics and Seidel third-order aberration theory, the paper derives apochromatic formula, and the power of individual lenses can be calculated. Then with a required value of spherical aberration and coma, this paper derives equations to calculate the initial structure of apochromatic optical systems. Finally, optimized refractive SWIR fore-optics working in 1μm-2.5μm with effective focal length (EFFL) of 11mm is reported. Its full field and F-number are respectively 40°, F/2.8. The system has many advantages such as simple and compact structure, small size, near diffraction-limited imaging quality, small secondary spectrum and imagery telecentricity. Especially it consists of spherical surfaces that can greatly reduce the difficulty and the cost of manufacture as well as test, which is applicable for SWIR imaging spectrometer with wide field of view.

Proceedings Article | 28 October 2016 Paper

Design of optics for compact star sensors

Minyi Xu, Rongbao Shi, Weimin Shen

Proceedings Volume 9683, 968317 (2016) https://doi.org/10.1117/12.2241615

KEYWORDS: Optical design, Star sensors, Stray light, Signal to noise ratio, Stars, Lens design, Sensors, CMOS sensors, Signal attenuation, Satellites

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In order to adapt to small size and low cost space platform such as mini-satellites, this paper studies the design of optics for compact star sensor. At first, the relationship between limiting magnitude and optical system specifications which includes field of view and entrance pupil diameter is analyzed, based on its Pyramid identification algorithm and signal-to-noise ratio requirement. The specifications corresponding to different limiting magnitude can be obtained after the detector is selected, and both of the complexity of optical lens and the size of baffle can be estimated. Then the range of the limiting magnitude can be determined for the miniaturization of the optical system. Taking STAR1000 CMOS detector as an example, the compact design of the optical system can be realized when the limiting magnitude is in the interval of 4.9Mv~5.5Mv. At last, the lens and baffle of a CMOS compact star sensor is optimally designed, of which length and weight is respectively 124 millimeters and 300 grams.

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