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: a two wire transmission line connecting a detecting end with a receiving end; an operational circuit located on the detecting end receiving electric power through said transmission line and capable of detecting noise signals obtained from a relatively movin

A velocity detecting apparatus comprising: a two wire transmission line connecting a detecting end with a receiving end; an operational circuit located on the detecting end receiving electric power through said transmission line and capable of detecting noise signals obtained from a relatively moving object at two points spaced apart from each other in the direction of the motion and of producing an output signal responsive to the difference between the two noise signals; a current control element located on the detecting end and connected to said transmission line to control the current flowing therein by the output signal of said operational circuit; a d-c power source and current detecting means located on the receiving end and connected in series with said transmission line; and analysis means located on the receiving end to receive an input signal from said current detecting means and provide a signal related to the velocity of said moving object.