Method for measurement of displacement of moving body by use of

Details Method for measurement of displacement of moving body by use of Method for measurement of displacement of moving body by use of

1979-08-21

1981-10-27

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

250203CT, H04N 718

Patent

active

042977258

ABSTRACT:
Disclosed herein are a method for the measurement of physical displacement, including the angular displacement, of a body in motion and an apparatus for use in the method, which method comprises placing on the body a target mark divided by two perpendicularly intersecting lines into four areas which are shaded alternately bright and dark, taking the image of the target mark with an image pickup tube capable of random deflection by having a carrier for circular sweep superposed on a deflection voltage and thereby producing video signals, subjecting the video signals to synchronous rectification with the carrier and a sub-carrier possessing a frequency two times the frequency of the carrier for thereby obtaining mean values, calculating the value of deviation between the centers of the target mark and the circular sweep on the basis of the mean values and feeding the value of deviation back to the image pickup tube to cause the centers of the target mark and the circular sweep to coincide with each other, whereby the positional displacement and the angular displacement of the target mark on the body is measured on a real time basis.

REFERENCES:
patent: 3114859 (1963-12-01), Fathauer et al.
patent: 3433895 (1969-03-01), Malkiel
patent: 3651326 (1972-03-01), Alpers
patent: 3681528 (1972-08-01), Henderson
patent: 3953669 (1976-04-01), Saccomani et al.

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