Geometrical instruments – Distance measuring – Of flexible material
Patent
1992-12-21
1994-05-10
Will, Thomas B.
Geometrical instruments
Distance measuring
Of flexible material
33716, 33732, 33750, B65H 6100
Patent
active
053096479
ABSTRACT:
An apparatus for measuring the length of fiber optic cable being deployed om a winch to an underwater environment. The cable deployment measuring apparatus of the present invention comprises a constant current generator for generating a direct current, a resistor array having a plurality of series connected resistors and a plurality of trip wires with one of the trip wires being connected across each of the resistors. The trip wires which function as short circuits are also attached to the cable at predetermined locations along the length of the cable. When the fiber optic cable is being deployed, each trip wire will break when the location at which the trip wire is positioned is unwound from the winch for deployment in the underwater environment. This, in turn, will cause flow through the resistor array with a resulting voltage drop across the array. A digital volt meter may, for example, be used to measure the voltage drop across the array with the voltage reading provided by the volt meter being indicative of the length of fiber optic cable already deployed.
REFERENCES:
patent: 1286156 (1918-11-01), Vallaro
patent: 1625976 (1927-04-01), Bechtel
patent: 2729100 (1956-01-01), McCool et al.
patent: 2934695 (1960-04-01), Maulsby
patent: 3713224 (1973-01-01), Bengua
patent: 4400882 (1983-08-01), Thornton
Forrest, Jr. John L.
Kalmbaugh David S.
Sliwka Melvin J.
The United States of America as represented by the Secretary of
Will Thomas B.
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