Aaf Ltd

Acosense Ab

Mats Åbom

Lennart Thegel

Thomas Liljenberg

Colin Alexander Malecki

Raymond Kirby

James Matthew Hill

Paul Timothy Williams

Stevan Backa

A sound suppression apparatus for installation inside a gas transport duct is provided. The sound suppression apparatus comprises a resistive sound-absorbing element () and a housing providing a reactive sound-attenuating element () communicating with a surrounding of the apparatus via opening in an outer surface of the housing. An outer surface of the sound suppression apparatus comprises an outer surface of the resistive sound-absorbing element and the outer surface of the housing. A gas transport duct comprising the sound suppression apparatus is also provided.

Sound suppression apparatus

In the present invention a controllable acoustic source () in connection with the process fluid () emits a signal () into the fluid (), consisting of a suspension of particles (), being volumes of gas, liquid or solid phase. The controllable acoustic signal () is allowed to interact, with the particles (), and the acoustic (pressure) signals () resulting from such an interaction is measured preferably via a sensor (). A spectrum is measured. The spectrum is used to predict properties, content and/or size of the particles () and/or used to control a process in which the process fluid () participates. The prediction is performed in the view of the control of the acoustic source (). The used acoustic signal has preferably a frequency below 20 kHz.

Active acoustic method for predicting properties of process fluids comprising solid particles or gas/liquid volumes based on their size distribution and concentration

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Järfälla, Sweden

Mats Åbom