Compact wide-range digital stretch gauge

Details Compact wide-range digital stretch gauge Compact wide-range digital stretch gauge

1978-09-29

1980-02-26

Little, Willis

Geometrical instruments

Area integrators

Electrical

33174L, 73760, G01L 700

Patent

active

041898427

ABSTRACT:
Above the base are a pair of arms pivotally mounted about a common axis and extending in opposite directions from the axis. At the distal ends of the arms are a pair of downwardly extending pins which form sensors and position the arms at various angular positions depending upon the tension of the tensioned sheet upon which the base rests. A pair of plates extend upwardly from the arms, intercepting a light beam. The amount of the beam intercepted will vary depending upon the angular position of the arms. A photo detector is positioned to receive the unintercepted part of the beam and to produce an electrical signal varying with the amount of light received. A digital voltmeter provides a visual indication of the magnitude of the electrical signal.

REFERENCES:
patent: 2365353 (1944-12-01), Morris
patent: 3729985 (1973-05-01), Sikorra
patent: 3826487 (1974-07-01), Forster et al.

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