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A Stable Phantom Material for Optical and Acoustic Imaging

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A liquid level sensor using the absorption of guided acoustic waves.

D Royer¹, L Levin, O Legras

¹Lab. Ondes et Acoust., Paris Univ.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|January 1, 1993

Summary

This novel liquid level sensor uses acoustic waves in a magnetostrictive wire to precisely measure fluid levels. The sensor

Area of Science:

Physics
Engineering
Materials Science

Background:

Accurate liquid level measurement is crucial in various industrial and scientific applications.
Traditional sensors may face challenges with harsh environments, corrosive liquids, or high pressures.
Magnetostrictive sensors offer a non-contact and robust method for position sensing.

Purpose of the Study:

To develop and characterize a new liquid level sensor based on magnetostrictive principles.
To investigate the acoustic wave propagation and energy leakage into liquids for level detection.
To establish a method for determining liquid level by measuring acoustic wave time-of-flight.

Main Methods:

A hollow cylindrical sensor element with an impedance-matching conic section is suspended on a magnetostrictive wire.

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Acoustic waves are generated in the wire via a current pulse and transmitted to the cylinder.

The sensor element is immersed to a measurable depth, causing elastic waves to leak into the liquid.

Liquid level is determined by measuring the time-of-flight of the reflected echo from the wire-horn junction.

Main Results:

The sensor successfully utilizes acoustic wave leakage into the liquid for level detection.
The time-of-flight measurement of the reflected echo provides a direct correlation to the immersion depth.
A correction term based on echo attenuation refines the accuracy of the liquid level measurement.

Conclusions:

This magnetostrictive liquid level sensor offers a precise and reliable method for fluid monitoring.
The design leverages acoustic wave properties and time-of-flight measurements for accurate level determination.
The sensor is suitable for applications requiring robust and non-contact liquid level sensing.