Apparatus for determining the distance from a predetermined poin

Details Apparatus for determining the distance from a predetermined poin Apparatus for determining the distance from a predetermined poin

1983-02-23

1986-02-04

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367 13, G01S 1508

Patent

active

045690375

ABSTRACT:
Method and apparatus for determining the distance from a preselected point to a target. An electrostatic ultrasonic transducer in a special protective housing is used with a single-pulse, square-wave transmitter to compare a main signal with a calibration signal. A warning signal indicates when the number of signals actually received during each one hundred signals sent drops below a predetermined percentage. Noise is minimized by careful spacing and shaping of the calibration bar and by insulating foam in the housing.

REFERENCES:
patent: 3271730 (1966-09-01), Stedtnitz
patent: 3748637 (1973-07-01), Larson et al.
patent: 4210969 (1980-07-01), Massa
patent: 4254482 (1981-03-01), Newman
patent: 4323992 (1982-04-01), Tobin, Jr.

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