Apparatus for measuring distances

Details Apparatus for measuring distances Apparatus for measuring distances

1988-08-02

1990-03-20

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367910, G01S 1500

Patent

active

049107178

ABSTRACT:
Apparatus for measuring distances comprising circuit for sending an acoustic signal to a distant location, the distance of which is to be measured, circuit for receiving back reflected acoustic energy, and electronic circuit means for eliminating spurious echoes by providing a threshold signal level above the signal level of said spurious echoes, and a timing circuit to time the interval between the transmission of the acoustic signal and receipt of the acoustic signal.

REFERENCES:
patent: 3004707 (1961-10-01), Wilson
patent: 3454922 (1969-07-01), Dory
patent: 4451909 (1984-05-01), Kodera et al.
patent: 4464738 (1984-08-01), Czajkowski
patent: 4581726 (1986-04-01), Mankino et al.
patent: 4644513 (1987-02-01), Czajkowski

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