Vibration-detecting intrusion alarm

Details Vibration-detecting intrusion alarm Vibration-detecting intrusion alarm

1978-08-16

1981-01-27

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6148, 200 6102, 307117, 340545, G08B 1308

Patent

active

042478472

ABSTRACT:
An opaque box encloses a lamp, an integrated circuit light-change detector including a photo-diode and an amplifier, and an opto-mechanical means for modulating the light that is coupled from the lamp to the photodiode in response to a mechanical vibration of the box. This device serves as a vibration detector and more particularly as an intrusion alarm when mounted on a door or a window.

REFERENCES:
patent: 3709030 (1973-01-01), Aselman, Jr.
patent: 4012611 (1977-03-01), Petersen
patent: 4103842 (1978-08-01), Martin et al.

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