Photoelectric tape profile detector for file security

Details Photoelectric tape profile detector for file security Photoelectric tape profile detector for file security

1982-02-24

1987-07-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356376, 382 1, G01N 2186

Patent

active

046820396

ABSTRACT:
Disclosed is a method and apparatus whereby each time a tape is wound upon a prescribed reel, the winding pattern may be assumed to leave the array of tape edges in a unique "edge profile" represented by the position of each winding edge as viewed from one side of the reel along a radial direction--this "profile" being interpreted as a "winding signature"; the signature may be detected photo-electrically and recorded in a convenient encoded fashion for possible use in uniquely identifying and documenting each unspooling/rewind sequence to thereby monitor tape use.

REFERENCES:
patent: 4200394 (1980-04-01), Bartlett et al.
patent: 4337659 (1982-07-01), Ragle

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