Liansheng An

Beijing Institute of Optoelectronic Technology

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Co-Authors

Lin Li

Beijing Institute of Technology

Yifan Huang

ShanghaiTech University

Guangjun Gao

Central South University

Yongtian Wang

Beijing Institute of Technology

Yifan Huang

Hong Kong University of Science and Technology

Menghong Feng

Beijing Institute of Technology

Yongtian Wang

Beijing Institute of Technology

Yifan Huang

Sanya University

Lin Li

Dalian Institute of Chemical Physics

Lin Li

Anhui University of Finance and Economics

Cooperative Institutions

Beijing Institute of Technology

Beijing Institute of Optoelectronic Technology

Fuzhou University

Nanjing Tech University

Ministry of Industry and Information Technology

Northwestern Polytechnical University

Beijing Film Academy

North China Electric Power University

Chinese Academy of Sciences

Shanghai Institute of Optics and Fine Mechanics

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Research Field

The Method to Measure inductance of PMSM

Liansheng An

After analyzing the inductance of PMSM and comparing some general methods,a method to measure inductance of PMSM is developed ion this paper.It could be applied to product detection.In this paper,not only the feasibility of the method is verified,but also the significance of measuring result in motor detection if presented.

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New method of target detection in the moving camera and moving target mode

Optical Technique (2005)

Liansheng An

Target tracking in the moving camera-moving target (MC-MT) is a difficulty for image analysis. According to the theory of applied optics and coordinate transformation, the mapping transformation differential method (MTDM) is developed. With the mapping transformation, the method converts the difficult target detection in MC-MT into the detection in the static camera-moving targets (SC-MT), which is researched more completely. The tracked targets can be detected with differential method. The experiment result shows that the MTDM can reduce the background noise effectively and detect the targets accurately.

Tracking (education)

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Research for uniform illumination systems

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2002)

Yifan Huang Lin Li Liansheng An Yongtian Wang

Methods of getting uniform illumination are introduced in this paper. Studies on a new optical components -- Rod lens are carried out and rules of its uniformity changing with respect to its size are deduced.

10.1117/12.486436

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Intersection Measurement with CCD in Detecting Multi-Targets

International Optical Design Conference (2002)

FENG Menghong Lin Li Yifan Huang Liansheng An

To conquer the traditional measuring system's disadvantages that can only measure a simple target, a new intersection measuring system with CCD is established to detect multi-targets in real-time processing with their different gray levels.

10.1364/iodc.2002.ime11

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Discussing effect of unhealthy postures during work and daily life on spine and limbs impaired diseases

Tianjin Journal of Traditional Chinese Medicine (2011)

Liansheng An

This article discussed the influence of unhealthy postures during work and daily life on impaired diseases of spine and limbs.From the concept of anatomy,physiology,pathology,biologic mechanics and clinical manifestation the pathogenic characteristics of unhealthy postures were discussed.The impairment of unhealthy postures on spine and four extremities could cause common and some less common impaired diseases.

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Design of complex optical system for measuring vibrant track of cable crossing river

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2002)

Guangjun Gao Lin Li Yifan Huang Liansheng An Yongtian Wang

In order to measure the vibrant track of a cable crossing a river, a complex optical system is introduced to realize the image of a rectangle on a CCD image surface. The quantitative diagnosis of the system's aberrations reveals that the distortion is beyond the tolerance. A new and accurate method of digital correcting the distortion with asymmetrical distribution is proposed.

Distortion (music)

Rectangle

Level crossing

10.1117/12.486434

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Research on CCD intersection measuring techniques in detecting multiple targets

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2002)

Menghong Feng Lin Li Yifan Huang Liansheng An Yongtian Wang

A new method of CCD intersection measurement in detecting multiple targets is discussed, and the math-model for the coordinate measurement of CCD is set up. This method is different from conventional measurement method in that it is able to detect many targets at the same time according to diverse gray level. And this model can improve the measurement accuracy and increase computing speed.

10.1117/12.486435

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Computer simulation and analysis for the intensity distribution of illumination systems

Optical Technology (1998)

Liansheng An

In this paper, the differences between the illumination systems and the traditional imaging systems are explained. In addition, several methods or principles for calculating the intensity distribution of illumination systems are given. At last, an example that uses computer to simulate the intensity distribution of the projection system is given.

Intensity

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The Research for Uniform Illumination Systems

International Optical Design Conference (2002)

Yifan Huang Lin Li Liansheng An

A uniform distribution of light is expected in many illumination systems. There are several factors influencing the uniformity of light distribution : the intensity distribution of light sources, the aberration of optical systems, and the variability of reflecting index and absorbing index[1].

Light intensity

Intensity

10.1364/iodc.2002.ime10

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Design of Complex Optical System for Measuring Vibrant Track of Cable Crossing River

International Optical Design Conference (2002)

Guangjun Gao Lin Li Yifan Huang Liansheng An

Because the wide span of a cable crossing a river and the strong wind over the river, the cable crossing the river always has very big vibrant range which may lead to the crack of the cable and bring great economic loss. The system is developed and used to measure the vibrant track of the cable crossing a river. It can image the vibrant track of the cable on the CCD plane. By data collecting and processing, we can judge whether the vibration is beyond the safe range and take further measures to avoid the crack of the cable.

Level crossing

Optical fiber cable

10.1364/iodc.2002.ime12

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