中国科学院机构知识库网格系统: 检索

Initial In-Flight Spectral Calibration of the Near-Infrared Spectra Acquired by the MarSCoDe Onboard the Zhurong Rover 期刊论文 OAI收割
REMOTE SENSING, 2022, 卷号: 14, 期号: 9, 页码: 13
作者: Wu, Bing; Liu, Chengyu; Xu, Rui; Lin, Honglei; Xu, Xuesen

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收藏 | 浏览/下载：46/0 | 提交时间：2022/07/19

Zhurong rover near-infrared AOTF in-flight calibration wavelength offset

Initial In-Flight Spectral Calibration of the Near-Infrared Spectra Acquired by the MarSCoDe Onboard the Zhurong Rover 期刊论文 OAI收割
REMOTE SENSING, 2022, 卷号: 14
作者: Wu, Bing; Liu, Chengyu; Xu, Rui; Lin, Honglei; Xu, Xuesen

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收藏 | 浏览/下载：44/0 | 提交时间：2022/12/23

Zhurong rover near-infrared AOTF in-flight calibration wavelength offset

Beam-based calibrations of the BPM offset at C-ADS Injector II 期刊论文 OAI收割
CHINESE PHYSICS C, 2016, 卷号: 40, 页码: 4
作者: Chen, Wei-Long; Wang, Zhi-Jun; Feng, Chi; Dou, Wei-Ping; Tao, Yue

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收藏 | 浏览/下载：34/0 | 提交时间：2018/05/31

ADS Injector II beam commissioning BPM offset calibration null comparison method

Beam-based calibrations of the bpm offset at c-ads injector ii 期刊论文 iSwitch采集
Chinese physics c, 2016, 卷号: 40, 期号: 7, 页码: 4
作者: Chen, Wei-Long; Wang, Zhi-Jun; Feng, Chi; Dou, Wei-Ping; Tao, Yue

收藏 | 浏览/下载：44/0 | 提交时间：2019/05/09

Ads injector ii Beam commissioning Bpm offset calibration Null comparison method

Modeling and analysis of dialyte-lens auto-focusing technology for theodolite (EI CONFERENCE) 会议论文 OAI收割
2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications, November 16, 2008 - November 19, 2008, Beijing, China
Wu L.-T.; Qiao Y.-F.; Wu D.-K.; Cai S.

收藏 | 浏览/下载：23/0 | 提交时间：2013/03/25

In order to realize real-time auto-focusing for theodolite lens-apart method was designed with the corresponding math model built and analyzed. An Object beam splitted after the first image surface of the theodolite traveled through two dialyte lens and then was imaged on CCD. The distance between two spots when exactly focused was set as the calibration value and the relationship between defocus distance and spot offset was given. The influence of tracking center shift and divergence angle etc. on focusing accuracy was analyzed. Compared with the traditional focusing method this scheme has a higher accuracy faster calculation higher tolerance for environment temperature and a simpler construction. The experiment result exhibited a resolution higher than 0.056mm which shows a bright engineering application prospect for this method. 2009 SPIE.

An automated method to calibrate industrial robot joint offset using virtual line-based single-point constraint approach 会议论文 OAI收割
St Louis, MO, USA, October 11-15, 2009
作者: Liu Y(刘永); Zhang, George; Li, Xiongzi; Chen, Heping; Zhang, Chi

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收藏 | 浏览/下载：20/0 | 提交时间：2017/03/14

Robot Offset Calibration Virtual Lines-based Single-point Constraint

Development and sensitivity analysis of a portable calibration system for joint offset of industrial robot 会议论文 OAI收割
St Louis, MO, USA, October 11-15, 2009
作者: Liu Y(刘永); Zhao, Jianguo; Nieves-Rivera, Erick; Jia, Yunyi; Gao, Bingtuan

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收藏 | 浏览/下载：12/0 | 提交时间：2017/03/14

Robot Joint Offset Calibration Sensitivity Development

Chip design of linear CCD drive pulse generator and control interface (EI CONFERENCE) 会议论文 OAI收割
2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies - Advanced Optical Manufacturing and Testing Technologies, November 2, 2005 - November 5, 2005, Xian, China
作者: Sun H.; Wang Y.; Wang Y.; Wang Y.; Wang Y.

收藏 | 浏览/下载：30/0 | 提交时间：2013/03/25

CCD noises and their causes are analyzed. Methods to control these noises such as Correlated Double Sampling (CDS) filtering cooling clamping and calibration are proposed. To improve CCD sensor's performances the IC called Analog Front End (AFE) integration of CDS clamping Programmable Gain Amplifier (PGA) offset and ADC which can fulfill the CDS and analog-to-digital conversion is employed to process the output signal of CCD. Based on the noise control approaches the idea of chip design of linear CCD drive pulse generator and control interface is introduced. The chip designed is playing the role of (1) drive pulse generator for both CCD and AFE and (2) interface helping to analysis and transfer control command and status information between MCU controller and drive pulse generator or between global control unit in the chip and CCD/AFE. There are 6 function blocks in the chip designed such as clock generator for CCD and AFE MCU interface AFE serial interface output interface CCD antiblooming parameter register and global control logic unit. These functions are implemented in a CPLD chip Xilinx XC2C256-6-VQ100 with 20MHz pixel frequency and 16-bit high resolution. This chip with the AFE can eliminate CCD noise largely and improve the SNR of CCD camera. At last the design result is presented.

Study of removing striping noise in CCD image (EI CONFERENCE) 会议论文 OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者: Liu H.; Liu H.; Liu H.

收藏 | 浏览/下载：16/0 | 提交时间：2013/03/25

Striping noise is the common system noise during formation of image using linear array CCD and has the character of periodicity directivity and banding distributing. It can be caused by errors in internal calibration devices or by slight gain/offset differences among the elements that conform the array of detectors. Striping noise covers up useful information in CCD image and brings adverse effect to image interpretation. On the basis of analyzing wavelet decomposed coefficient the regularities of distribution about striping noise in wavelet coefficient is found thereby the method of wavelet threshold selection which is suitable to striping noise distribution is put forward. According to Donoho's method about denoising using wavelet the image including striping noise is processed. Comparing the power spectrum of processed image with the one of original image polluted by striping noise in frequency field we find pulse brought by striping noise is removed and the goal which reserves image details and reduces stripes is achieved.

Research on the nonuniformity correction of linear TDI CCD remote camera (EI CONFERENCE) 会议论文 OAI收割
Advanced Materials and Devices for Sensing and Imaging II, November 8, 2004 - November 10, 2004, Beijing, China
Ya-xia L.; Zhi-hang H.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

Many applications such as industrial inspection and overhead reconnaissance benefit from line scanning architectures where time delay integration (TDI) significantly improves sensitivity[5]. Images with linear response have become the backbone of the imaging industry. But each pixel of the TDI CCD has unique light sensitivity characteristics. Because these characteristics and the lens of the optical system affect camera's linearization and its performance they must be removed through calibration. The process by which a CCD image is calibrated is known as nonuniformity correction. This paper discusses several methods of nonuniformity correction[2]. The first is one-point correction technique which requires only one calibration point. This approach is to shift each curve toward the nominal curve by subtracting the offset from or adding the offset to the average. The second is two-point correction technique which requires two calibration points. Each point is rotated and aligned so that all the detectors have the same response under the same radiance. The third is multipoint correction. It is recommended that more calibration points be implemented at appropriate regions of the response curve. Depend on the linear photoelectric response of the TDI CCD we use two-point calibration and the standard deviations for the images are given before and after the correction.