Acoustic pipe length measuring apparatus

Details Acoustic pipe length measuring apparatus Acoustic pipe length measuring apparatus

1992-03-24

1993-03-16

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367902, 367101, G01S 1500

Patent

active

051950596

ABSTRACT:
An acoustic pipe length measuring apparatus for measuring the length of a pipe-like member in accordance with the time between the emission of a pulse-like sound wave from a speaker at one end thereof and the collection of sound waves reflected at the other end thereof, by a microphone, and a sonic velocity, in which data of a sonic velocity at a reference temperature of a gas present in the pipe-like member is stored in memory, and a sonic velocity value at a temperature of gas detected in the pipe-like member is computed with the use of the data of a sonic velocity value which is read from the memory in accordance with a kind of gas in the pipe-like member, thereby it is possible to calculate the length of the pipe-like member from the sonic velocity value obtained through the computation and the above-mentioned time.

REFERENCES:
patent: 4584676 (1986-04-01), Newman
Th. Gast, et al.; "Laengenmessung mit Luftschall", in: Messen + Pruefen, vol. 19, (1983) Nov., No. 11, pp. 676-681.
Collection of papers regarding lecture of Japanese Acoustic Society; Mar. 1990.

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