Geometrical instruments – Area integrators – Electrical
Patent
1982-12-22
1985-11-05
Martin, Jr., William D.
Geometrical instruments
Area integrators
Electrical
364562, G01B 1102
Patent
active
045505047
ABSTRACT:
The measurement of the length of a straight line or an arc, traversed during relative movement of two bodies, and especially the measurement of the distance of a predetermined point on the first one of the two bodies, which point may be defined by providing a first marking on the first body, from at least one second marking which is one of a plurality of markings provided on a first marking carrier which is fixedly connected to the second of the two bodies, is made possible by imparting an oscillatory movement to a first sensor which is provided on the first body and scans the markings on the first marking carrier and generates a time significant signal at each crossing by the first sensor of the at least one second marking, by further generating a reference signal each time the first sensor moves through a predetermined position with respect to the first marking on the first body, measuring the time distance between at least one time-significant signal and one reference signal, both signals being generated during the same stroke of the oscillatory movement, and providing a value representing the mean value of the velocity of the oscillatory movement during the period of time between the generation of the two signals and calculating the distance in question from the measured time distance, from the known distance between the position of the first sensor at which the reference signal is generated and the first marking and from the mean value of the velocity.
REFERENCES:
patent: 3170100 (1965-02-01), Rantsch et al.
patent: 3582769 (1971-06-01), Brandenburg
patent: 4158509 (1979-06-01), Rieder et al.
patent: 4226024 (1980-10-01), Westerberg et al.
patent: 4479716 (1984-10-01), Nelle
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