ULTRASONIC WAVE INTERFACE LEVEL METER

Japanese Patent JPH04188028

A

PURPOSE:To make it possible to detect the interface levels of a plurality of mediums in a container by setting the reflecting number of a reflected wave which is reciprocated in the container through the wall of a shell and medium as the number of delayed signals corresponding to the level of the interface of the medium, and inputting the wave into the wave receiver. CONSTITUTION:When the level of a liquid surface is low, only a transmitted wave signal a0 is received with a wave receiver 12, and there is almost no loss. The signal level itself has less attenuation. When fluid is slightly much as in (b), the signal wave which leaks into the liquid is transmitted into the wall of a shell from the facing wall surface of a container. The wave is reflected from the outer wall surface and returned into the liquid again. The wave is reflected from the outer wall surface on this side. The wave leaks into the liquid again but cannot reach the facing wall surface. The effective reflected wave is only once. Only one reflected signal a1 is observed as a delay pulse in addition to the transmitted wave signal a0. When the liquid surface is high as in (c), reflected waves are obtained as two time delay signals a1 and a2. In the case of the high liquid level indicated in (d), three reflected wave signals a1, a2 and a3 are obtained.

NASU YASUSHI
TODA KOJI

JP31953790A

July 06, 1992

November 21, 1990

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NISCA CORP
TODA KOJI

G01F23/28; (IPC1-7): G01F23/28

Nobuyuki Matsubara (1 outside)

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