中国科学院机构知识库网格系统: 检索

Vertical transfer of microplastics in nearshore water by cultured filter-feeding oysters 期刊论文 OAI收割
JOURNAL OF HAZARDOUS MATERIALS, 2024, 卷号: 475, 页码: 13
作者: Li, Jiasen; Liu, Jialin; Wang, Xiaodan; Zhang, Tianyu; Wang, Dongyu

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收藏 | 浏览/下载：120/0 | 提交时间：2024/10/24

Plastic pollution Vertical flux Aquaculture Infrared chemical imaging system Sediments

Optical design of a prism-gating-based lenslet array integral field spectrometer 期刊论文 OAI收割
Optics Express, 2018, 卷号: 26, 期号: 15, 页码: 19456-19469
作者: Liu, J. A.; Chen, J. J.; Liu, J. L.; Feng, S. L.; Li, X. T.

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收藏 | 浏览/下载：14/0 | 提交时间：2019/09/17

infrared imaging spectrometer spectrograph osiris system spectroscopy fabrication keck Optics

Calculating model for equivalent thermal defocus amount in infrared imaging system 期刊论文 OAI收割
Infrared Physics and Technology, 2016, 卷号: 74, 页码: 72-80
作者: Zhang CS(张程硕); Shi ZL(史泽林); Xu BS(徐保树); Feng B(冯斌)

收藏 | 浏览/下载：38/0 | 提交时间：2016/01/30

Infrared imaging system Thermal effect Wave aberration Defocus Athermalization

Reduction of artefacts and noise for a wavefront coding athermalized infrared imaging system 期刊论文 OAI收割
Journal of Optics (United Kingdom), 2016, 卷号: 18, 期号: 7, 页码: 1-13
作者: Feng B(冯斌); Zhang, Xiaodong; Shi ZL(史泽林); Xu BS(徐保树); Zhang CS(张程硕)

收藏 | 浏览/下载：27/0 | 提交时间：2016/08/14

wavefront coding infrared imaging system artefact, noise

Comparison of radiation temperature measurement precision between middlewave and longwave thermal-imaging systems (EI CONFERENCE) 会议论文 OAI收割
2012 International Conference on Optoelectronics and Microelectronics, ICOM 2012, August 23, 2012 - August 25, 2012, Changchun, China
作者: Sun Z.

收藏 | 浏览/下载：28/0 | 提交时间：2013/03/25

A comparison study on temperature measurement precision between middlewave 3-5m and longwave 8-12m measuring thermal imaging systems has been conducted. The study was limited to systems working in indoor conditions and the target's temperature is in the range of 270K900K. First the Disturb Resisting Function (DRF) of infrared systems is deduced. On the base of DRF curve we find that the middlewave infrared system get the smaller influences under the same size disturb compared with the longwave system. A theory of the influence of target's physical characteristic and measurement conditions on the accuracy of temperature measurements has been developed. On the basis of the developed formulas an analysis of the influence of signal disturbances (because of incorrectly assumed emissivity limited transmittance of the atmosphere radiation reflected by the object and shift of optics radiation) on the accuracy of temperature measurement has been made. It has been found that the middlewave systems in typical temperature range offer generally better accuracy in temperature measurement than the longwave ones do. 2012 IEEE.

Design of reimaging F/1.0 long-wavelength infrared optical system (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China
作者: Zhang X.; Zhang X.; Zhang X.

收藏 | 浏览/下载：36/0 | 提交时间：2013/03/25

A reimaging F/1.0 long-wavelength infrared optical system is proposed. The design has a flexible opto-mechanical layout. The design process is as follows. Firstly the catadioptric reimaging system consists of two reflecting mirrors and a relay lenses. Two reflecting mirrors make up of the first imaging system and are therefore free of chromatic aberrations while low dispersion lenses were used in the reimaging system so the optical system do not need achromatic design for a high image quality. Then to correct high-order aberrations resulting from large relative aperture more parameters need to be used with aspheric or diffractive surfaces due to modern optic technology development. Here aspheric is selected for easily manufacture. Finally the design is completed with the help of ZEMAX software. The effective focal length of the objective is 120mm and the field of view (FOV) is 4. The simulated final design shows adequate image quality and the modulation transfer function (MTF) is close to diffraction limit. The effect of the surrounding environmental temperature is analyzed using the concept of thermal defocusing and the thermal compensation is discussed. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

Evaluation of the operating range for ground-based infrared imaging tracking system (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China
作者: Zhang Z.-D.

收藏 | 浏览/下载：48/0 | 提交时间：2013/03/25

Ground-based infrared imaging tracking system (GIITS) is of great importance for aerial target warning and guard. The operating range is one of the key performance specifications on the other which should be calculated calculate the radiation power received on the detector in order to analysis whether the output signal meets the detection requirements or not analyzed and studied during the whole GIITS design process. The operating range is mostly influenced by a few factors without considering the effect of the background radiation. By improving of the traditional method including atmospheric attenuation a new operating range calculation model of the GIITS was established based on two requirements. One is that the image size of observed target should meet the requirement of the processor signal extraction. The number of the pixel occupied by target image should be more than 9. The other is that the signal noise ratio (SNR) of the GIITS should not be less than 5 to meet the requirements of the target detection probability and spatial frequency. The SNR calculation equation in form of energy is deduced and the radiation characteristic of the observed target and background are analyzed. When evaluate the operating range of the GIITS using the new method the performance of GIITS and feature of target and background. This paper firstly makes analysis and summarization on the definite localizations of the traditional operating range equation of the GIITS. The localizations are mainly in two aspects. On one hand we should successively calculate two operating range values according to two requirements mentioned above and choose the minimum value as the analytic result. In the end the dispersion of the image and the effect of image dispersion are not considered in the traditional method an evaluation of operating range for fighter aircraft is accomplished as an example. The influence factors in every aspect on operating range were explored by the calculated result. The new operating range calculation model provides the theoretical basis for the design and applications as well as the comprehensive evaluation of a GIITS. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

Design of visible, infrared dual-channel optical system for space target detection (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electronics and Optoelectronics, ICEOE 2011, July 29, 2011 - July 31, 2011, Dalian, China
Zhang X. Y.

收藏 | 浏览/下载：23/0 | 提交时间：2013/03/25

This paper designs a total of 250mm dual-channel optical system including visible (0.5m0.8m) infrared (3m5m). The main system is a three-reflection system and the primary mirror is designed as the first and the third reflecting surface with different figuring. The cooling infrared detector was choiced in infrared channel and achieves 100% cool shield efficiency of luminescence through the second imaging. The main benefits of this design are the large corrected and unvignetted FOV an easily baffling of stray light small encumbrance and an easy handing. 2011 IEEE.

Accurate measuring temperature with infrared thermal imager in the unstable condition of ambient temperature 会议论文 OAI收割
2011 international conference on optical instruments and technology: optoelectronic measurement technology and systems, beijing, china, november 6, 2011 - november 9, 2011
WangJing; QuEn-Shi; CaoJian-Zhong

收藏 | 浏览/下载：27/0 | 提交时间：2012/07/09

infrared thermal imaging system temperature measurement blackbody unstable condition

Thermal difference analysis and athermalization design of infrared optical system (EI CONFERENCE) 会议论文 OAI收割
Optical Design and Testing IV, October 18, 2010 - October 20, 2010, Beijing, China
作者: Zhang X.; Zhang X.; Zhang X.

收藏 | 浏览/下载：32/0 | 提交时间：2013/03/25

When infrared optical system works in a large temperature range the thermal effect of optical lens and optical tube will produce image plane shift and lead to imaging quality deterioration. In order to eliminate the thermal aberration the athermalization design principles of infrared optical system were introduced and some commonly used methods of thermal difference compensation were described. Proceeding from single lens the thermal difference caused by temperature changing was analyzed and the relationship between temperature and focus shift was obtained. Considering optical tube thermal expansion a set of equations to estimate the thermal difference of lens group was given. Finally an infrared optical imaging system that can work under the temperature range of -40C to 60C was design according to athermal technique in which a new mechanical passive temperature compensation was proposed. Through simulation the athermalization design could make imaging plane shift the smallest. The simulation results coincided with the theoretical formula and the design had reference value in engineering. 2010 Copyright SPIE - The International Society for Optical Engineering.