Method for measuring length, and apparatus for implementing the

Details Method for measuring length, and apparatus for implementing the Method for measuring length, and apparatus for implementing the

1990-01-08

1992-03-31

Williams, Hezron E.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

G01N 2900

Patent

active

050996916

ABSTRACT:
The length of a column of a gaseous or liquid substance or of a solid bar is determined by generating a standing wave of known frequency, wavelength and/or wave velocity in the column or in the bar. The wave frequency is varied until at least two consecutive maxima (antinodes), two consecutive minima (nodes) or a minimum following a maximum of the amplitude of the standing wave have been detected. The length of the column of medium at known frequency and wave velocity of the standing wave generated in that column is computed from the equation

REFERENCES:
patent: 3237445 (1966-03-01), Wood
patent: 3798959 (1974-03-01), Bowles et al.
patent: 4584676 (1986-04-01), Newman
patent: 4653327 (1987-03-01), Varterasian et al.
"11. Laufzeitverfahren", Werkstoffprufung mit Ultraschall, 1980, by J. Krautkramer et al., pp. 265-267.

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