| 摘要 |
An apparatus and method for measuring the velocity of a relative movement between first and second bodies or between a first body and a fluid. The first body may be stationary and the second body a moving body, such as hot strip steel. Alternatively, the first body may be an aircraft or ship whose velocity is to be measured or it may be a pipe or duct along which a fluid is flowing. At least two detectors are mounted on the first body and serve to detect noise signals representing disturbances in the fluid or on the second body. Correlating means generate data for producing at least two correlation or autocorrelation curves from the signals from the detectors. The data from the correlating means is then combined to enable production of a combined cross-correlation or auto-correlation curve, from which the relative velocity can be computed.
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