Mr. Mark Tang Profile

Mark Tang

at Tianjin Univ

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Proceedings Article | 27 January 2009 Paper

A digital particle image velocimetry (DPIV) system based on multispectral imaging

Chunxiao Tang, Enbang Li

Proceedings Volume 7156, 71560T (2009) https://doi.org/10.1117/12.806182

KEYWORDS: Particles, Cameras, Pulsed laser operation, Imaging systems, Velocimetry, Time metrology, Multispectral imaging, Charge-coupled devices, Control systems, Image processing

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We describe in this paper a DPIV system based on multispectral imaging. The system consists of three pulsed lasers, a laser pulse combined system, a multispectral camera, a synchronizer and a computer with frame grabber. Wavelengths of three pulsed lasers are 532nm, 650nm and 800nm. The laser pulses are combined together into the same beam path to illumine the flow field. The beam splitting prism in the multispectral camera send the 532nm, 650nm and 800nm laser pulses to three different CCD arrays respectively. The narrowband filters in front of the CCD arrays select specific wavebands for every CCD. The three CCD arrays can work independently. They catch three images of the same area of the flow field for different wavelengths at different moments in one exposure period. The synchronizer, which controls the time sequence between the camera and lasers, has a time precision of 1ns and time step length of 50ns. To measure a flow field, firstly, the synchronizer controls the camera to open shutter, then, it controls three lasers to generate laser pulses at different moments in one exposure time to illumine the flow field. With this system we can get three particle images at three certain moments set by the synchronizer in one exposure period (less than 0.14s). The system has been validated in the lab and the result is also laid out in this paper. In this system, the time interval between different particle images just depends on the pulse interval time of different wavelengths, and it is independent of the frame rate of the camera, which is the most important advantage of this system. With different time intervals, this system can be used to measure flow field with different speed level. And further more, by setting two different time intervals for a single measurement, the system can be also used for high speed flow field with complicated structure measurement. Due to its features, perspective of its appreciation should be wide.

Proceedings Article | 24 January 2008 Paper

The design of a laser-based digital displacement/deflection measurement system of a remote object and its calibration

Chunxiao Tang, Enbang Li

Proceedings Volume 6829, 68291T (2008) https://doi.org/10.1117/12.757617

KEYWORDS: Sensors, Charge-coupled devices, Transmitters, Laser development, Signal detection, CCD image sensors, Calibration, Laser systems engineering, Receivers, Laser sources

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We describe in this paper a laser-based digital displacement measuring system, which can detect displacement or deflection of an object in a long distance. It has the advantages of nor-contact, high resolution, fast response, and more importantly being remote. In order to achieve a remote measurement, the laser beam is first collimated, and directed to the detector array, which is attached to the remote object to be measured. The relative movement between the laser source and the detector will provide a measure to the displacement or deflection of the object. This system has three major features compared with the common laser-based displacement measurement systems. The first one, remote wireless digital signal and data transmission has been used in this measurement system, which increases the stability and practicability of the system. The second one, a laser level instrument has been used as a laser source, which makes it much easier to direct the laser beam to the detector at a long distance. The last one, MCU and LED have also been investigated, which makes the system more convenient. The measurement effect is proved by experiment. The academic measuring distance of the system is 100m and it is calibrated at a distance of 20m in the lab. The measuring frequency of the system is 29Hz. The error of the system is between -0.07mm to 0.07mm and the standard error is less than 0.05mm. The standard error of the system at an immovable point in four hours is 0.0134mm. Due to its features, perspective of its appreciation should be wide

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