Method and apparatus for error reduction when measuring movement

Details Method and apparatus for error reduction when measuring movement Method and apparatus for error reduction when measuring movement

1988-08-09

1990-07-03

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

With electromagnetic wave

367122, 342 52, G01S 1574

Patent

active

049397010

ABSTRACT:
With the measurement of spatial movement of test points by means of ultrasonic signals, the problem exists that often interferences occur which may lead to distortion of test results. It is proposed to check the space between sound transmitter and sound receiver by means of electromagnetic waves, in particular light waves, for absence of obstacles, and/or not to use for the derivation of the distances those ultrasonic signals whose transit time and/or amplitude lie outside a given expectancy range, but to discard them.

REFERENCES:
patent: 4026654 (1977-05-01), Beaurain
patent: 4105990 (1978-08-01), Rines et al.
patent: 4207571 (1980-06-01), Passey
patent: 4313183 (1982-01-01), Saylors
patent: 4751689 (1988-06-01), Kobayashi

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