Polymeric security window

Details Polymeric security window Polymeric security window

1989-08-21

1990-06-19

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

310322, 367191, G08B 1304, G08B 1316

Patent

active

049357239

ABSTRACT:
A security window is a laminated pair of polymeric window panels having waveguides sandwiched therebetween for transmission of ultrasonic compression waves. The waveguide transmission medium is glass fibers extending from edge to edge of the plastic panels and distributed in plastic strips which cover the entire window area. The index of refraction of the glass fibers is as identical as possible to that of the surrounding plastics, making the waveguides substantially invisible. A transducer initiates an ultrasonic compression wave which travels the length of the waveguide, and is detected by a transducer at the other end of the waveguide. The received signal amplitude diminishes when the waveguide is damaged and such change is used to trigger an external alarm system.

REFERENCES:
patent: 3889250 (1975-06-01), Solomon
patent: 3946377 (1976-03-01), Zetting
patent: 4023156 (1977-05-01), Galvin
patent: 4112420 (1978-09-01), Mifune et al.
patent: 4142188 (1979-02-01), Zetting et al.
patent: 4367460 (1983-01-01), Hodara

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