Ultrasonic level instrument with dual frequency operation

Details Ultrasonic level instrument with dual frequency operation Ultrasonic level instrument with dual frequency operation

1993-12-09

1995-09-26

Raevis, Robert

Measuring and testing

Liquid level or depth gauge

73 1DV, 73 1H, G01F 2328

Patent

active

054526116

ABSTRACT:
An ultrasonic level instrument detects the presence of a fluid at a defined location and provides a self-diagnostic integrity check. An excitation circuit simultaneously induces vibrations at a first and second frequency in a transmitting piezoelectric crystal, and the vibrations are detected by a receiving crystal. A first and second filter circuit generate first and second filter outputs, respectively, by selectively passing the receiving crystal output at the first and second frequencies, respectively. The first filter output is indicative of the presence of fluid and the second filter output is indicative of the sensor integrity.

REFERENCES:
patent: 4299114 (1981-11-01), Silvermetz et al.
patent: 4896535 (1990-01-01), Duckart et al.
patent: 5031451 (1991-07-01), Webster
patent: 5155472 (1992-10-01), Dam
patent: 5269188 (1993-12-01), Esin

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