Acoustical length measurement

Details Acoustical length measurement Acoustical length measurement

1988-10-06

1990-06-05

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

367902, G01N 2904

Patent

active

049303503

ABSTRACT:
An apparatus and method for measuring the length of a tubular body. The apparatus comprises: a transmitter (10) positioned at first end of the tubular body (12) for transmitting an acoustical signal along the interior of the body (12), a reflecting medium (14) provided at the other end of the body (12) for reflecting the transmitted acoustical signal, acoustical receivers (26, 28) for measuring the period of time for the signal to be transmitted along the body (12) from the transmitter (10) to the second end of the body (12) and be reflected back to the first end, acoustical receivers (26, 28) provided along the central axis of the body (12) for measuring the speed of sound therein, and, circuitry (42, 44) for calculating and displaying the length of the body (12) as a function of the period of time and speed of sound in the body (12). The method comprises the steps of: pre-selecting an acoustical signal at a frequency at or below the "cut on" frequency of the body (12), transmitting the signal along the interior of the body (12) from the transmitter (10) positioned at the first end to the reflector (14) positioned at the other end and back again to the transmitter (10), measuring the period of time for the signal to be transmitted along the body (12) from the transmitter (10) to the other end (14) of the body (12) and be reflected back to the first end, measuring the speed of sound provided along the central axis of the body (12), and, calculating the length of the body (12) as a function of the period of time and the speed of sound in the body (12).

REFERENCES:
patent: 4494224 (1985-01-01), Morrell et al.
patent: 4584676 (1986-04-01), Newman

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