Dr. Liqiang Wang Profile

Dr. Liqiang Wang

at Tianjin Univ of Technology and Education

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Publications (8)

Proceedings Article | 29 August 2009 Paper

Study of working principle and thermal balance process of a double longitudinal-mode He-Ne laser

Li-qiang Wang

Proceedings Volume 7382, 73824X (2009) https://doi.org/10.1117/12.836333

KEYWORDS: Laser stabilization, Metals, Helium neon lasers, Temperature metrology, Polarization, Pulsed laser operation, Molecules, Absorption, Magnetism, Glasses

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Proceedings Article | 17 January 2008 Paper

High resolution detection system of capillary electrophoresis

Jie Wang, Li Qiang Wang, Yan Shi, Hua Zheng, Zu Kang Lu

Proceedings Volume 6723, 67230K (2008) https://doi.org/10.1117/12.782913

KEYWORDS: Capillaries, Signal processing, Luminescence, Optical filters, Laser induced fluorescence, Fluorescence spectroscopy, Signal to noise ratio, Confocal microscopy, Filtering (signal processing), Electronic filtering

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Proceedings Article | 8 January 2008 Paper

Optical path layout and moving mirrors of wavemeter based on Michelson interferometer

Liqiang Wang, Yuexiang Peng, Fengyou Gao, Yongli He, Hongxing Zheng

Proceedings Volume 6835, 68350X (2008) https://doi.org/10.1117/12.758088

KEYWORDS: Mirrors, Doppler effect, Photodiodes, Beam splitters, Michelson interferometers, Prisms, Control systems, Reflectors, Chemical oxygen iodine lasers, Control systems design

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General wavemeters based on Michelson interferometer only have a moving arm, which cann't more multiply optical paths' differences, and is unable to avoid dispersion from a beamsplitter. Commonly, the moving mirror driven by a direct current motor and a ball screw have some disadvantage, such as heavy weight, unstable motion. In the paper, a better optical layout, and configuration and a driving method of moving mirrors are proposed. A newly optical paths layout of a wavemeter based on Michelson Interferometer is present, including two moving mirrors for forming optical paths' differences, a beamsplitter for splitting a light into a transmitted light and a reflected light, two reflectors, and a reference laser. It has two moving arms and can eliminate dispersion from the beamsplitter. According to Doppler effect, how to form the interference fringes in the photodiodes is analyzed and formulated. The Doppler effect appears with motion of the moving mirrors. Consequently, alternately dark and bright interference fringes are generated, then received and converted into the electronic signals by the photodiodes. It is concluded that the electronic signals involves the wavelength of a light and the velocity of the moving mirror by investigating the Doppler effect. The structure of the moving mirrors is clarified. The moving mirrors are made of the two pyramid prisms which are placed symmetrically on the driving motor. A controlling system for keeping the moving mirrors in constant velocity is designed. In order to make frequencies of electronic signals from interference fringes stable, the moving mirrors must move in a uniform speed. The voice coil motor (VCM) drags the moving mirror to and fro. VCM in uniform motion is realized by an optical-mechanical-electrical closed-loop feedback system. The Doppler frequency difference of the reference laser is the standard of the system. The PID controller comprising parallel proportional-integral-differential operational circuit regulates the velocity of VCM.

Proceedings Article | 4 January 2008 Paper

Study of Fourier transform spectrometer based on Michelson interferometer wave-meter

Yuexiang Peng, Liqiang Wang, Li Lin

Proceedings Volume 6837, 68370T (2008) https://doi.org/10.1117/12.754741

KEYWORDS: Optical testing, Digital signal processing, Fourier transforms, Reflectors, Spectroscopy, Channel projecting optics, Michelson interferometers, LCDs, Sensors, Pulsed laser operation

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Proceedings Article | 29 November 2007 Paper

Research on the technology of fluorescence separation from exciting light for LIF detection

Yan Shi, Liqiang Wang, Hua Zheng, Jie Wang, Zukang Lu

Proceedings Volume 6722, 672215 (2007) https://doi.org/10.1117/12.782959

KEYWORDS: Luminescence, Mirrors, Laser induced fluorescence, Optical filters, Fluorescence spectroscopy, Capillaries, Sensors, Signal to noise ratio, Laser systems engineering, Objectives

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Proceedings Article | 9 June 2006 Paper

Detection apparatus for fluorescent microarray slides

Liqiang Wang, Zukang Lu

Proceedings Volume 6149, 614918 (2006) https://doi.org/10.1117/12.674232

KEYWORDS: Objectives, Confocal microscopy, Optical scanning, Scanners, Sensors, Photomultipliers, Luminescence, Signal detection, Charge-coupled devices, CCD image sensors

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Proceedings Article | 3 December 2005 Paper

Michelson interferometer for laser wavelength

Liqiang Wang, Wenjie Ren

Proceedings Volume 6020, 60202M (2005) https://doi.org/10.1117/12.636227

KEYWORDS: Reflectors, Sensors, LCDs, Signal detection, Laser stabilization, Helium neon lasers, Michelson interferometers, Tunable lasers, Doppler effect, Spectroscopy

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Proceedings Article | 18 January 2005 Paper

Novel confocal microarray scanner for fluorescence detection

Liqiang Wang, Xuxiang Ni, Zukang Lu

Proceedings Volume 5630, (2005) https://doi.org/10.1117/12.573428

KEYWORDS: Scanners, Optical scanning, Confocal microscopy, Signal detection, Laser scanners, 3D scanning, Luminescence, Fluorescence spectroscopy, Chemical oxygen iodine lasers, Objectives

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Showing 5 of 8 publications

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