Position determining devices

Details Position determining devices Position determining devices

1979-03-08

1980-07-15

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Plural transmitters to receiver or transmitter to plural...

367125, 367901, G01S 172

Patent

active

042132002

ABSTRACT:
An improved position determining device using a delay line with energy absorptive terminations at the ends thereof and having a driver transducer coupled to the delay line for producing a traveling wave on the line and a first receiver transducer coupled to the delay line at the distance to be determined. A second receiver transducer, also coupled to the delay line, is displaced from the first receiver transducer by a distance preferably substantially equal to one-quarter wavelength of the traveling wave signal. Each of the receiver transducers detects the direct traveling wave signal from the driver transducer and a traveling wave signal component which is reflected from an end termination. The detected signals from the second receiver transducer are phase-shifted by a 90.degree. phase lag and the phase-shifted signals are combined with the signals detected by the first receiver transducer, whereby the reflected signal components in the combined output signal are effectively eliminated.

REFERENCES:
patent: 3186226 (1965-06-01), Milnes et al.
patent: 4035762 (1977-07-01), Chamuel

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