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Boris D Zaitsev

Shrinivas G Joshi

A low profile transducer ( ) is provided for use in flow meter for pipes of small diameter. The transducer ( ) has a transducer ( ) or other form of transducer which transmits and receives electrical signals of three volts and 1 MHz and converts between these electrical signals and acoustic waves. In one embodiment, the transducer ( ) produces surface acoustic waves (SAW), while in another embodiment the transducer ( ) produces plate waves known as Lamb waves. These waves are converted to bulk acoustic waves (BAW) transmitted between the pair of transducers ( ).

Low profile transducer for flow meters

A method and apparatus for measuring the thickness of sludge being deposited on the sidewall of a rotating turbine can in a centrifuge by measuring the electrical admittance (capacitance or conductance) between the sidewall of the turbine can and the base, shaft, or body of the centrifuge which is electrically isolated from the turbine can. An electrical circuit is coupled to the sidewall of the turbine can to measure a change in the thickness of the sludge being deposited on the inner surface of the sidewall by measuring a change in voltage, admittance, capacitance, or conductance between the turbine can and the base, shaft or body of the centrifuge which are all at ground potential. The apparatus of the invention includes a typical centrifuge which is modified by adding a pair of insulating rings to the structure of the centrifuge to electrically isolate the turbine can from the rest of the centrifuge structure.

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Saratov, Russia

Boris D Zaitsev