Alarm system for detecting disturbance of a solid medium

Details Alarm system for detecting disturbance of a solid medium Alarm system for detecting disturbance of a solid medium

1975-01-30

1977-05-10

Swann, III, Glen R.

Communications: electrical

Systems

Call station

340261, 340409, G08B 1322, G08B 1308

Patent

active

040231569

ABSTRACT:
A window pane or other acoustically propagative medium is excited with a source of sonic or ultrasonic energy by use of a suitable transducer affixed to the pane and the amplitude and/or phase of the resulting pattern is sensed and processed to derive a signal repesentative thereof. Violation of the integrity of the pane such as by cutting or breakage thereof or disturbance of the pane such as touching or leaning on the pane causes a sensible change in the pattern and from which is derived an output signal for signifying an alarm condition when the change exceeds a predetermined threshold level.

REFERENCES:
patent: 2477567 (1949-08-01), Barker
patent: 2935728 (1960-05-01), Morgan
patent: 3487396 (1969-12-01), Perelman
patent: 3760400 (1973-09-01), Galvin et al.
patent: 3845461 (1974-10-01), Foreman
patent: 3863240 (1975-01-01), Galvin
patent: 3889250 (1975-06-01), Solomon
patent: 3946377 (1976-03-01), Zetting

Affiliated with

Also associated with

Rating

Alarm system for detecting disturbance of a solid medium does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Alarm system for detecting disturbance of a solid medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alarm system for detecting disturbance of a solid medium will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1986764