发明授权
- 专利标题: Laser speckle velocity-measuring apparatus
- 专利标题(中): 激光斑点速度测量仪
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申请号: US207864申请日: 1988-06-17
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公开(公告)号: US4912519A公开(公告)日: 1990-03-27
- 发明人: Tomio Yoshida , Nobuo Nakatsuka , Hiroshi Kitajima , Tsukasa Yamashita
- 申请人: Tomio Yoshida , Nobuo Nakatsuka , Hiroshi Kitajima , Tsukasa Yamashita
- 申请人地址: JPX Kyoto
- 专利权人: Omron Tateisi Electronics Co.
- 当前专利权人: Omron Tateisi Electronics Co.
- 当前专利权人地址: JPX Kyoto
- 优先权: JPX62-154038 19870619; JPX62-95163[U] 19870619
- 主分类号: G01P3/80
- IPC分类号: G01P3/80
摘要:
There is provided a laser speckle velocity-measuring apparatus comprising: a semiconductor laser to irradiate the light to a moving object; first and second photo sensing devices whose light receiving points are arranged in the moving direction of the objects at a predetermined distance so as to be away from each other; a clock signal generating and control circuit for determining a clock frequency of the clock signal so that the number of clocks of the clock signal is always set to a constant value when the delay time of the photo sensing signal of the second photo sensing device for the photo sensing signal of the first photo sensing device is measured by the clock signals; and an arithmetic operating circuit for counting the clock signals and calculating the length, moving distance, or velocity of the object on the basis of the count value. With this apparatus, the detecting time of the length or velocity of the moving object can be reduced and the measuring processes can be performed in a real-time manner.