Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Patent
1982-08-09
1985-05-07
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Returned signal used for control
367 96, 367 99, G01S 1508, G01S 752
Patent
active
045162298
ABSTRACT:
An acoustic distance measuring system for detecting a small change in position of a remote object and changing the state of a relay. An acoustic transmitter and receiver are connected by an amplifier circuit which is induced into oscillation when a portion of the transmitted acoustic signal is reflected by a remote surface back to the receiver, forming an external feedback path, said oscillations occurring only in alternate half wavelengths of feedback path length, in which the reflected waves are generally in phase with the transmitted waves. A detector circuit responsive to the amplifier oscillations provides an output which is used to change the state of a relay.
REFERENCES:
patent: 2333688 (1943-11-01), Shepard, Jr.
patent: 3031644 (1962-04-01), Hisserich et al.
patent: 3065455 (1962-11-01), Roth
patent: 3597754 (1971-08-01), Lerner
patent: 3729702 (1973-04-01), Beeken et al.
patent: 3881353 (1975-05-01), Fathauer
patent: 4260980 (1981-04-01), Bates
patent: 4263665 (1981-07-01), Watts
patent: 4290126 (1981-09-01), McFadyen et al.
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