Ultrasonic line sensor

Details Ultrasonic line sensor Ultrasonic line sensor

1981-06-26

1983-11-08

Swann, III, Glen R.

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

340566, 340665, G08B 1322

Patent

active

044146523

ABSTRACT:
An ultrasonic line sensor including an elongated transmission line for longitudinal pressure waves, which changes transmission characteristics with change in the length of the line due to transverse mechanical loading, and also including apparatus for energizing the line with longitudinal pressure waves at a long term frequency which establishes a standing wave in the line, and for responding to short-term changes in the natural frequency of the line.

REFERENCES:
patent: 2649579 (1953-08-01), Alexander
patent: 2721994 (1955-10-01), Brown
patent: 3438021 (1969-04-01), Nelkin et al.
patent: 4004268 (1977-01-01), Cook
patent: 4023156 (1977-05-01), Galvin
patent: 4107660 (1978-08-01), Chleboun
patent: 4112420 (1978-09-01), Mifune
patent: 4286261 (1981-08-01), Wagner et al.
patent: 4300135 (1981-11-01), Korn et al.

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