中国科学院机构知识库网格系统: 检索

Influence of Wavelength-to-Excavation Span Ratio on Dynamic Failure Characteristics of a Deep-Buried Tunnel Subjected to Disturbance 期刊论文 OAI收割
INTERNATIONAL JOURNAL OF GEOMECHANICS, 2022, 卷号: 22, 期号: 10
作者: Mei, Wanquan; Xia, Yuanyou; Pan, Pengzhi; Li, Mei; Han, Gaosheng

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收藏 | 浏览/下载：15/0 | 提交时间：2023/08/02

Author keywords Dynamic perturbation Wavelength-to-excavation span ratio Complex function theory Integral transform Elastoplastic cellular automaton

Evaluations of Environmental Trace Gases Monitoring Instrument (EMI) Level 1 Data 期刊论文 OAI收割
SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 卷号: 41
作者: Cheng Liang-xiao; Tao Jin-hua; Zhou Hai-jin; Yu Chao; Fan Meng

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收藏 | 浏览/下载：48/0 | 提交时间：2022/03/21

GF-5 EMI Wavelength calibration Slit function Data quality

Phase Functions of Typical Lunar Surface Minerals Derived for the Hapke Model and Implications for Visible to Near-Infrared Spectral Unmixing 期刊论文 OAI收割
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 2019, 卷号: 124, 期号: 1, 页码: 31-60
作者: Yang, Yazhou; Li, Shuai; Milliken, Ralph E.; Zhang, Hao; Robertson, Kevin

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收藏 | 浏览/下载：59/0 | 提交时间：2019/03/14

spectrophotometric phase function ilmenite wavelength dependent lunar Spectralon

Mass motion in upper solar chromosphere detected from solar eclipse observation 期刊论文 OAI收割
ASTROPHYSICS AND SPACE SCIENCE, 2016, 卷号: 361, 期号: 5
作者: Li Z(李智); Qu ZQ(屈中权); Yan XL(闫晓理); Dun GT(敦广涛); Chang L(常亮)

收藏 | 浏览/下载：31/0 | 提交时间：2016/08/08

Sun: atmosphere Emission line profiles: mass motion Wavelength: function

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).

Athermal design of hybrid refractive/harmonic diffractive optical system for far-infrared multi-band (EI CONFERENCE) 会议论文 OAI收割
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, November 19, 2008 - November 21, 2008, Chengdu, China
作者: Liu Y.; Liu Y.; Zhang H.; Zhang H.; Sun Q.

收藏 | 浏览/下载：34/0 | 提交时间：2013/03/25

In order to get enough information about the target avoid big chromatic aberration as a result of wide spectrum and the complexity of optical system and adapt different special environment temperature a hybrid refractive/harmonic diffractive optical system in far-infrared multi-band is described in the paper. This diffractive optical system has been designed an athermalized multi-band imaging system with harmonic diffractive element in 15-50m spectrum based on larger 1dispersion capability and particular thermal dispersive power of harmonic diffractive element. Then at the temperature range from 0C to 40C this design can simultaneously meet with all requirements of the imaging system in five harmonic wave bands including15.8-16.2m 18.5-20m 23-25m 30.5-33.5m and 46-50m. In each harmonic wave band the magnification changes as a function of wavelength which creates image registration error. To compensate this shortcoming a zoom optical system is designed with three lenses by means of optical two- component method. The design results show that the hybrid refractive/harmonic diffractive optical system can realize athermalized and achromatic design and the zoom optical system makes half image height at 3.53mm in every harmonic wave band and still realizes aberration compensation action. In the five harmonic wave bands each optical transfer function approaches the diffraction limit at ambient temperature range of 0C to 40C. Finally the system realizes the requirements of portability mini-type and ease for fabrication. 2009 SPIE.

Imaging analysis of a novel compound diffractive telescope system (EI CONFERENCE) 会议论文 OAI收割
Optical Manufacturing and Testing VIII, August 4, 2009 - August 5, 2009, San Diego, CA, United states
作者: Liu H.; Liu Y.; Liu Y.; Liu Y.; Zhang H.

收藏 | 浏览/下载：35/0 | 提交时间：2013/03/25

The main feature of the compound diffractive telescope is the combination of diffractive optics with compound structure arranged eyepieces. In this paper a design of the compound diffractive telescope is firstly introduced and a 4.2 FOV is obtained with one primary lens and twenty-one eyepieces. Secondly image characteristic of different channels is analyzed with the design wavelength in ASAP and one modified phase function model of diffractive optical element is introduced to analyze the MTF curves for 0 FOV which provides a more accurate prediction of the performance of the system. Then the system is tested by the star image test and the diffraction limit images are got within 2 FOV. And finally two pictures taken from the adjacent FOV proved to be able to be spliced together. All the results above demonstrate that a good performance of the compound diffractive telescope. 2009 SPIE.

Method for obtaining real temperature of space object by using the ratio of emissivity at different wavelengths (EI CONFERENCE) 会议论文 OAI收割
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, November 19, 2008 - November 21, 2008, Chengdu, China
Guo-Qiang W.; Tao C.; Jian-Li W.

收藏 | 浏览/下载：33/0 | 提交时间：2013/03/25

The infrared radiation character (temperature and efficiency radiation area) of a space object is an important characteristic we can judge the state of the object working in orbit by measuring temperature and variety. Due to lower temperature of the object and far distance between the object and the earth the infrared radiation signal is faintness therefore temperature and the infrared radiation character is difficult to measure. There are several methods to measure the temperature of the object in theory and each one has its applicability respectively such as applying Wien Law to compute temperature based on Stefan-Bolzmann law to compute temperature and utilizing multi-spectrum detector to measure temperature As a whole these methods are based on the hypothesis that the object is a Black-body or the radiance emissivity is constant. In fact homochromatic radiance of object is not a constant but a function that changes with wavelength. Since the problem that an object whose homochromatic radiance s not a constant which results in temperature can not be computed accurately we bring forward a method to contrast the luminance of the object at different wavelengths and deduce the relationship among homochromatic radiance and wavelength and the temperature of Black-body from which we can compute real temperature of object. 2009 SPIE.

The spectral feature analysis of semiconductor thin disk laser (EI CONFERENCE) 会议论文 OAI收割
Optoelectronic Materials and Devices II, November 2, 2007 - November 5, 2007, Wuhan, China
作者: Li J.; Wang L.-J.; Wang L.-J.; Ning Y.-Q.; Li J.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

The semiconductor thin disk laser is a new type of semiconductor laser. This work gives the basic operation function of semiconductor disk laser and analyses the heat effect by the experimentally measured photoluminescence spectrum of the laser chip at different pump power and different temperature. We can see that: with increasing pump power the thermal effects of the gain material becomes seriously and causes the saturation of carrier lifetime so the electron-hole pair created in the absorbtion layer have no enough time to rate to one of the wells and the non-radiative recombination happens in the barrier. When the thermal effects becomes stronger the chip will not lasing. This phenomenon is from the smaller energy offset between barrier and quantum well. We optimize the original structure design and experimental technology. A non-absorbing AlGaAs layer who is transparent to the pumping and laser wavelength is added to confine the carriers in the quantum wells. At the same time a DBR with double reflecting band is induced to improve the absorbing efficiency of the pumping light. The single QW is replaced by the three narrow QWs This three QWs structure can add the quantum state of QW increase the recombination probability of carriers in the QWs and reduce the heat effect. The chemical etch equipment is also improved to control the surface unevenness to be within 50 nm.

The Information acquirement of hyperspectral detection system with harmonic diffractive element in infrared dual band (EI CONFERENCE) 会议论文 OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者: Zhang Y.; Gao Y.

收藏 | 浏览/下载：20/0 | 提交时间：2013/03/25

A novel design of combination of hybrid system and zoom system in hyperspectral detection imaging is discribed based on the application of harmonic diffractive element (HDE) compared with conventional system. The principles of HDE and infrared zoom hyspectral detection system are presented and the results of a example design are given. It is show that the resolution of this hybrid system is improved and the light power received by Cassegrain system is enlarged. Wavefront aberrations are less than 1/4 wavelength and Modulation Transfer Function in the dual band on each zoom focus location approaches or attains the diffraction limit on 20 cycles/mm.