초록 ▼

Noise signals from a relatively moving object, such as those caused by eddies in a fluid or by protrusions and recesses or gradation on the surface of paper or an iron plate, are sensed at two or more points spaced in the direction of the motion. A difference signal is then obtained from the resulti

Noise signals from a relatively moving object, such as those caused by eddies in a fluid or by protrusions and recesses or gradation on the surface of paper or an iron plate, are sensed at two or more points spaced in the direction of the motion. A difference signal is then obtained from the resulting two noise signals. The relative velocity of the object is detected from the difference signal by utilizing the autocorrelation function or the frequency spectrum of the difference signal.

대표청구항 ▼

A velocity detecting apparatus comprising: means for detecting noise signals obtained from a relatively moving object at two or more points spaced apart from each other in the direction of the motion; an operational circuit for computing the phase difference between the two signals from said noise-s

A velocity detecting apparatus comprising: means for detecting noise signals obtained from a relatively moving object at two or more points spaced apart from each other in the direction of the motion; an operational circuit for computing the phase difference between the two signals from said noise-signal detecting means; an autocorrelator receiving an input signal from said operational circuit; and a processor receiving an input signal from said autocorrelator, detecting the peak point of the auto-correlation function signal from said autocorrelator, executing a computation to produce a signal related to the velocity of said relatively moving object, and setting the sampling rate of said autocorrelator to a proper value.