Acoustic Sensors
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Akusticni_senzorji

An electrically passive fluid level gauge based on an acoustic resonator

This paper describes a novel electrically passive fluid level gauge. It is based on a one-dimensional low-frequency acoustic gas resonator. The acoustical power is delivered to the resonator an the acoustic waveguide and a fibre-optic microphone is used as an acoustic pressure sensor. Distances of over 100 m between the electrically passive sensor and the electrically active controller were achieved in practice. The proposed method can be successfully implemented in systems where problems of residues, deposits, foams, etc, can be expected.

A robust miniature acoustical liquid level gauge with micrometer resolution

This paper presents concept and design of a miniature liquid level gauge. An experimental level gauge with the measurement range of 5 cm, relative accuracy better than 0.5% and resolution better than 0.1%, has been demonstrated in practice. The proposed gauge proves to be robust in terms of jams, foams, deposits, residues, etc. In addition, the system uses relatively simple and potentially low cost design. Therefore, the proposed measurement system can be used independently or as a part of scientific, chemical, biomedical, industrial, or similar instrumentation.

Low-frequency acoustic resonance level detector with neural-network classification

This work presents a new level-detection method, it is based on the acoustic resonance of a waveguide. This method can be successfully implemented for fluid-level detection in industrial plants, where problems of residues, deposits, foams, etc., can be expected. The performance of the detector is additionally improved by the use of neural networks. Neural networks enable the detector to learn from the reference detection cycles; therefore, such a system is flexible and can he easily optimized (trained) for specific operating conditions. The detector has been tested in a highly viscous medium, Styrofoam granulate and under artificially induced residues and deposits in the resonance waveguide.

Low-frequency acoustic resonance level gauge

A new level-measurement method is presented. It is based on the acoustic resonance of a waveguide. This method can be successfully implemented for fluid-level measurements in industrial plants, where problems of residues, deposits, foams, etc., can be expected. An experimental gauge has been built and tested under artificially induced residues, foams, deposits, etc. The resonance gauge proves to be insensitive under extreme operating conditions. The proposed method represents an alternative to ultrasonic as well as to some other levelmeasurement methods.

The Use of One-Dimensional Acoustical Gas Resonator for Fluid Level Measurements

A new level measurement method based on the onedimensional (1-D) acoustics gas resonator is presented. The proposed method has been investigated in detail, and experimental gauges have been built and tested under artificially induced residues, foams and deposits. The level measurement method proves to be insensitive under extreme operating conditions, and it can be successfully implemented for fluid level measurements in a variety of industrial conditions. It is an alternative to ultrasonic as well to some other level measurement methods.