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CAR thieves: beware. Jimmying a lock or punching out an ignition switch to start and steal a car may soon be fruitless activities. If a new, Livermore-developed locking system were installed in the next car you tried to steal, you would find your theft next to impossible. After jimmying the lock, you would be faced with a fiber-optic cable activated only by a specially coded beam of light. Even if you punched out the ignition switch, an identical cable would prevent the engine from starting. Forget hot-wiring; the fiber-optic system would protect not only the door lock but also the ignition system, fuel pump, and starter.
Lawrence Livermore's Bob Clough, Karla Hagans, Richard Main, and Bob Stoddard from Defense and Nuclear Technologies and Engineering directorates developed this novel system (Figure 1, above). The researchers designed the optoelectronic-mechanical lock and key to secure military systems from theft and unauthorized operation, but soon the Light Lock Optical Security System could be used anywhere conventional mechanical locks are used.
A Laser Beam Does the Job
The key is entirely different from those used today. Instead of depending on the mechanical motion of turning in the lock, this key emits laser light from a light-emitting diode or a laser diode. The lock converts the light from the key into electrical power to operate its electronics. The key's light has been "multiplexed" with the code and wavelength required by that particular lock, so the lock must compare the transmitted code from the light to the code it has stored in memory. If they match, the lock opens (Figure 2).
Unlike standard mechanical locks, which have a mechanical connection between the key and the bolt mechanism, Light Lock has no connection, making it almost impossible to manipulate the locking mechanism. In conventional locks, the primary area of weakness is that mechanical connection. A common method of attacking these locks is to bore out the key access and turn the dead bolt. But with no mechanical connection between the key and the bolt, that strategy will not work.
The lock is totally passive with no internal power supply, and the only connection between the key and the lock is light. The combination for the lock can be made to any length desired and can include information other than the code, such as the user or the intended use. The power required by the Light Lock Optical Security System is similar to that found in a typical laser pointer. An added plus is that the key and lock are easily reprogrammed.
Another advantage of this system is that the key and the lock can work together even if they are separated from one another. The laser light from the key can travel along a fiber-optic cable to a vault, for example, that is secured in a buried enclosure. This remote operation feature makes it effective for securely granting access to sites that are a long distance from the person authorizing access. |