Ultrasonic intrusion alarm system

Details Ultrasonic intrusion alarm system Ultrasonic intrusion alarm system

1979-11-09

1981-09-15

Swann, III, Glen R.

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

G08B 1316

Patent

active

042901260

ABSTRACT:
An ultrasonic intrusion alarm system of the pulse-echo type transmits pulsed signals which are reflected by a reference surface. The resulting reference received pulsed signals appear as corresponding signals at the output of the system's receiver, which is gated on in coincidence with the arrival of said reference signals and is gated off at essentially all other times for minimum power consumption, the output signal state of said receiver being employed to cause the generation of an alarm signal upon the occurrence of an intrusion. The receiver includes an AGC amplifier network which exhibits a threshold voltage level that is a function of the signal strength of said reference signals which level is compared with the amplified received signals whereby said alarm is generated when said threshold level fails to be exceeded, such as due to an interruption of said signals.

REFERENCES:
patent: 3406385 (1968-10-01), Lerner
patent: 3474400 (1969-10-01), Auer, Jr. et al.
patent: 3781772 (1973-12-01), Inoue et al.
patent: 3922629 (1975-11-01), Hayakana

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