Tank level meter

Details Tank level meter Tank level meter

1989-08-23

1990-05-01

Cuchlinski, Jr., William A.

Measuring and testing

Liquid level or depth gauge

181400, 181402, 181 05, 367908, G01F 2328

Patent

active

049207962

ABSTRACT:
A tank level meter includes an elongated sound conductor of a solid material extending over the entire height of the tank. A sound generator is coupled to one end of the sound conductor to excite thereon surface waves and the opposite end of the conductor is coupled to a sound receiver. Due to different acoustic impedances of the material of the sound conductor of the fluids present in the tank that means of the air and of the liquid whose level is to be measured, the sound waves propagating at the interface of the sound conducting member and fluids arrive to the receiver with a phase shift which is proportional to the liquid level in the tank. By a suitable selection of materials of the sound conductor it is possible to obtain an unambiguous measuring signal at the receiver or a measuring signal having a high resolution. By using at least two sound conductors in the tank it is possible to obtain both a single value volume reading and a high resolution.

REFERENCES:
patent: 3010318 (1961-11-01), Mongan
patent: 3884074 (1975-05-01), Robertsson
patent: 4213337 (1980-07-01), Langdon
patent: 4305283 (1981-12-01), Redding
patent: 4545245 (1985-10-01), Sharp
patent: 4635746 (1987-01-01), Lin
patent: 4740726 (1988-04-01), Umezawa
patent: 4765186 (1988-08-01), Dieulesaint et al.

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