Mr. Bin Hu Profile

Bin Hu

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Proceedings Article | 20 January 2023 Paper

Design of off-axis mirror system for ultra-long exit pupil distance space laser communication terminal

Bin Hu, Yi Ji, Jianfeng Liu, Yang Li, Libing Jin, Tianjin Tang

Proceedings Volume 12559, 125590D (2023) https://doi.org/10.1117/12.2651769

KEYWORDS: Tolerancing, Optical tolerancing

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Aiming at the problems existing in the optical system of laser communication terminal, in order to improve the isolation level of the communication terminal, the off-axis four-mirror afocal system with ultra-long exit pupil distance used in the coude optical path laser communication terminal is studied. In this paper, the method of four-mirror afocal system design based on primary aberration is explored. The structural parameters are calculated according to primary aberration coefficient. The procedure for calculating initial structural parameters is programmed. Then a four-mirror afocal system is designed with an entrance pupil diameter of 100mm, a field of view of 500μrad, the operating wave band of 1.55μm, and compression ratio of 15 times. The distance of exit pupil is greater than 500mm. After assembly and adjustment, the wavefront error root mean square (RMS) value of the four-mirror afocal system is 0.0172λ(λ=1.55μm). The four-mirror afocal system in this paper can have good imaging quality, reduce the backreflection and scattering of the sensitive mirrors, and solve the contradiction between the ultra-long exit pupil distance and the ultra-large compression ratio. It has application prospect in the field of space laser communication and space gravitational wave detection.

Proceedings Article | 5 October 2017 Paper

Modeling and testing of geometric processing model based on double baselines stereo photogrammetric system

Yingbo Li, Sisi Zhao, Bin Hu, Haibo Zhao, Jinping He, Xuemin Zhao

Proceedings Volume 10428, 1042813 (2017) https://doi.org/10.1117/12.2278381

KEYWORDS: Sensors, Cameras, Photogrammetry, Satellites, Calibration, Error analysis

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Aimed at key problems the system of 1:5000 scale space stereo mapping and the shortage of the surveying capability of urban area, in regard of the performance index and the surveying systems of the existing domestic optical mapping satellites are unable to meet the demand of the large scale stereo mapping, it is urgent to develop the very high accuracy space photogrammetric satellite system which has a 1:5000 scale (or larger).The new surveying systems of double baseline stereo photogrammetric mode with combined of linear array sensor and area array sensor was proposed, which aims at solving the problems of barriers, distortions and radiation differences in complex ground object mapping for the existing space stereo mapping technology. Based on collinearity equation, double baseline stereo photogrammetric method and the model of combined adjustment were presented, systematic error compensation for this model was analyzed, position precision of double baseline stereo photogrammetry based on both simulated images and images acquired under lab conditions was studied. The laboratory tests showed that camera geometric calibration accuracy is better than 1μm, the height positioning accuracy is better than 1.5GSD with GCPs. The results showed that the mode of combined of one linear array sensor and one plane array sensor had higher positioning precision. Explore the new system of 1:5000 scale very high accuracy space stereo mapping can provide available new technologies and strategies for achieving demotic very high accuracy space stereo mapping.

Proceedings Article | 5 August 2015 Paper

Design of four-mirror afocal principal system for wide field multichannel infrared imaging

Bin Hu, Ying Huang, Yan Li

Proceedings Volume 9618, 96180D (2015) https://doi.org/10.1117/12.2190681

KEYWORDS: Mirrors, Imaging systems, Multichannel imaging systems, Infrared imaging, Wavefronts, Optical scanning systems, Remote sensing, Monochromatic aberrations, Modulation transfer functions, Image resolution

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The image space scanning system is widely used for multichannel infrared imaging to overcome the absence of large infrared focal plane array. The field of view of afocal system directly influences the time resolution of the image space scanning system. The field of view of afocal system is generally less than 7°. Therefore, it is significant to design larger field of view of afocal system for increasing time resolution. The method of four-mirror afocal system design based on primary aberration is explored. The structural parameters are calculated according to magnification and obscuration ratio of each mirror. The conic parameters are calculated according to primary aberration coefficients. The procedure for calculating initial structural parameters is programmed. Then a four-mirror afocal system is designed with an entrance pupil diameter of 200mm, a field of view of 20°×1°, the operating wave band of 3~12μm, compression ratio of 2.5 times and the distance of exit pupil of 620mm. The results indicate that the maximum root mean square (RMS) wavefront error is less than 0.042λ(λ=7.5μm), the maximum optical path difference(OPD) is less than λ/4(λ=3~12μm). It has high imaging quality and the modulation transfer function (MTF) is approached to the diffraction limit. The method of afocal system design can be widely used for wide field multichannel infrared imaging.

Proceedings Article | 18 November 2014 Paper

An infrared remote sensor with high integration and multi-spectral bands

Lisha Zhang, Zhaojun Liu, Wenpo Ma, Shaofan Tang, Bin Hu

Proceedings Volume 9299, 92990H (2014) https://doi.org/10.1117/12.2070981

KEYWORDS: Sensors, Staring arrays, Long wavelength infrared, Infrared sensors, Infrared imaging, Optical filters, Infrared radiation, Mid-IR, Imaging systems, Remote sensing

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Along with the further application of optical remote sensing, it becomes main trend to realize high spatial resolution, high time resolution, high spectrum resolution and high irradiance sensitivity simultaneously. We present a new satellite-based imaging system that will provide images with these high performances. The structure of the system is compact with small size and light weight. The IR imager, a new generation of high resolution optical remote sensing, is universally acknowledged as the most effective approach to surveil dynamic changes in the environment on the earth. Pushbroom imaging fashion with high efficiency and long-array focal plane detector with passive cooling are adopted to realize area imaging relevant to the flight direction of satellite. The instrument is a dual-optical-path system with long-wave infrared (LWIR) and mid-short-wave infrared (MW-SWIR) bands，which has 4 narrow spectrum bands respectively. An IR dichroic beam-splitter is use to divide wideband incident infrared into LWIR and MW-SWIR. Then two pieces of joint filters, which are integrated in front of detectors and then enveloped by IR Dewars, are used to divide the LWIR and MWIR into 4 spectral bands separately. The focal plane arrays (FPA) are fixed on the optical imaging plane of the lens. The LWIR and MW-SWIR FPA are cooled around 80K or even below. For cooled FPA, optical system must provide a real, accessible exit pupil coupled with a fast f/number refractive component in a Dewar and very close to the FPA. Compared to traditional infrared instruments, high spatial resolution and spectrum resolution can be obtained simultaneously within mass, volume and performance constraints.

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