WILLIAM FRANK KEARNS
Engineers in Columbus, OH
License number
Virginia 0402013604
Issued Date
Dec 22, 1982
Expiration Date
Dec 31, 1989
Category
Professional Engineer License
Type
Professional Engineer
Address
Address
Columbus, OH
Professional information
Oscillator Proximity Switch
US Patent:
4516229, May 7, 1985
Filed:
Aug 9, 1982
Appl. No.:
6/406309
Inventors:
William F. Kearns - Columbus OH
International Classification:
G01S 1508, G01S 752
US Classification:
367 95
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.