Length measurement

Details Length measurement Length measurement

1985-10-23

1987-03-03

Little, Willis

Geometrical instruments

Area integrators

Electrical

33142, 33129, G01B 704

Patent

active

046464425

ABSTRACT:
Apparatus for measuring the length of a moving elongate element (1), such as a cable, comprises first and second rotative members (2), (3), rotatable by frictional contact with the element. The second member (3) responds to changes in the velocity of the element (1) to a differing extent to that of the first member (2). The rotation of each member is measured by detectors (11), (12), and data fed to a microprocessor (13) which compares the rotation of the two members to give an indication of the amount of slippage between one or both members and the element (1). The slippage is taken into account in determining the length of the moving element. The differing response to changes in velocity can be achieved by the second member (3) being of a different inertia to that of the first member (2). Alternatively the members frictionally contact the element to a different extent.

REFERENCES:
patent: 2276739 (1942-03-01), Rogers
patent: 3436954 (1969-04-01), Eppler
patent: 3702404 (1972-11-01), McDermitt
patent: 3739276 (1973-06-01), Dornberger
patent: 3824694 (1974-07-01), Lesperance et al.
patent: 4041610 (1977-08-01), Uesugi et al.
patent: 4052599 (1977-10-01), Whiteley et al.
patent: 4400882 (1983-08-01), Thornton

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