Ultrasonic sensing and monitoring systems

Details Ultrasonic sensing and monitoring systems Ultrasonic sensing and monitoring systems

1984-07-27

1986-12-09

Swann, III, Glen R.

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

307117, 340540, G08B 2100

Patent

active

046284966

ABSTRACT:
The presence of persons in a space is sensed with the aid of ultrasonic pulses which are sent out into the space when echoes of such ultrasonic pulses are received. Echoes attributable to the floor or to parts of a door in the space are timed out, and a remainder of such echoes is employed for sensing persons in the space. For example, sliding or revolving doors may be controlled and operated with the aid of such ultrasonic echoes, and limited access to secured areas may be provided thereby.

REFERENCES:
patent: 3233084 (1966-02-01), Kendall et al.
patent: 3367450 (1968-02-01), Lester et al.
patent: 3622957 (1971-11-01), Libengood et al.
patent: 4459689 (1984-07-01), Biber
Polaroid, "Ultrasonic Ranging System" brochure.
Polaroid, "Tech. Specifications for Polaroid Electrostatic Transducer".
Texas Instruments, Specifications for SN28827 Ranging Module, SN28826 Soner Ranging Control IC, SN 28825 Sonar Ranging Receiver IC.
Polaroid, "Polaroid Ultrasonic Ranging System Product Change Notice".

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