Flow measurement: using a chopper together with a CW laser to realize a frame straddling technique

✍ Scribed by Hao Wang; Lijiang Zeng; Chunyong Yin; Liping Xie

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 899 KB
• Volume: 33
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/s0030-3992(01)00042-1

✦ Synopsis

A simple method that uses a chopper together with a CW laser to realize a frame straddling technique for ow measurement is introduced, in which a chopper with two windows is used to generate double pulses for exposure. By changing the size and position of each window, the time and interval of exposure can be adjusted easily. The light source is a CW semiconductor laser. The advantage of this method is in its being simple, cheap and compact. The method has been validated on a hydrodynamic ow involving a von Kà armà an Vortex Street.