Device for length measurement

In order to carry out the measuring method according to Patent No. 393 738 (A 68/89), a device is proposed which has a loudspeaker 1 arranged in a resonant cavity 2 with a tubular sound exit opening 3. The resonant cavity 2 is arranged via a spacer 4 at a spacing from the tube (pipe) 6 in which the...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	PRIBYL WOLFGANG DR, SCHUSTER HERMANN
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	ANALOGOUS ARRANGEMENTS USING OTHER WAVES DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES MEASURING MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL METERING BY VOLUME PHYSICS RADIO DIRECTION-FINDING RADIO NAVIGATION TESTING
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Beschreibung
Zusammenfassung:	In order to carry out the measuring method according to Patent No. 393 738 (A 68/89), a device is proposed which has a loudspeaker 1 arranged in a resonant cavity 2 with a tubular sound exit opening 3. The resonant cavity 2 is arranged via a spacer 4 at a spacing from the tube (pipe) 6 in which the gas or liquid column whose length is to be determined is contained. The spacer 4 also carries a receiving microphone 7. In order to keep constant the level of the sound pressure in the resonant cavity over the frequency/wavelength region (range), the volume (sound pressure) in the resonant cavity is kept constant via a controller 11 with a controller microphone 10.