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Title: Optical key system

Abstract

An optical key system comprises a battery-operated optical key and an isolated lock that derives both its operating power and unlock signals from the correct optical key. A light emitting diode or laser diode is included within the optical key and is connected to transmit a bit-serial password. The key user physically enters either the code-to-transmit directly, or an index to a pseudorandom number code, in the key. Such person identification numbers can be retained permanently, or ephemeral. When a send button is pressed, the key transmits a beam of light modulated with the password information. The modulated beam of light is received by a corresponding optical lock with a photovoltaic cell that produces enough power from the beam of light to operate a password-screen digital logic. In one application, an acceptable password allows a two watt power laser diode to pump ignition and timing information over a fiberoptic cable into a sealed engine compartment. The receipt of a good password allows the fuel pump, spark, and starter systems to each operate. Therefore, bypassing the lock mechanism as is now routine with automobile thieves is pointless because the engine is so thoroughly disabled.

Authors:
;
Publication Date:
Sponsoring Org.:
US Department of Energy
OSTI Identifier:
20023243
Alternate Identifier(s):
OSTI ID: 20023243
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 25 Apr 2000
Country of Publication:
United States
Language:
English
Subject:
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; VEHICLES; PHYSICAL PROTECTION DEVICES; DESIGN; IDENTIFICATION SYSTEMS; PHOTON BEAMS; PHOTOVOLTAIC CELLS; FIBER OPTICS; THEFT; CRIME

Citation Formats

Hagans, K.G., and Clough, R.E. Optical key system. United States: N. p., 2000. Web.
Hagans, K.G., & Clough, R.E. Optical key system. United States.
Hagans, K.G., and Clough, R.E. Tue . "Optical key system". United States.
@article{osti_20023243,
title = {Optical key system},
author = {Hagans, K.G. and Clough, R.E.},
abstractNote = {An optical key system comprises a battery-operated optical key and an isolated lock that derives both its operating power and unlock signals from the correct optical key. A light emitting diode or laser diode is included within the optical key and is connected to transmit a bit-serial password. The key user physically enters either the code-to-transmit directly, or an index to a pseudorandom number code, in the key. Such person identification numbers can be retained permanently, or ephemeral. When a send button is pressed, the key transmits a beam of light modulated with the password information. The modulated beam of light is received by a corresponding optical lock with a photovoltaic cell that produces enough power from the beam of light to operate a password-screen digital logic. In one application, an acceptable password allows a two watt power laser diode to pump ignition and timing information over a fiberoptic cable into a sealed engine compartment. The receipt of a good password allows the fuel pump, spark, and starter systems to each operate. Therefore, bypassing the lock mechanism as is now routine with automobile thieves is pointless because the engine is so thoroughly disabled.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {4}
}