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Article title SIMULATION OF PIEZOTRANSDUCER’S ACOUSTIC FIELD OF ULTRASOUND LIQUID LEVEL GAUGE IN BOILER DRUM
Authors S.V. Solomicheva, V.P. Tarasyuk
Section SECTION I. MATHEMATICAL MODELS AND METHODS
Month, Year 04, 2014 @en
Index UDC 534.231:621.3.092
DOI
Abstract In the analysis of types and characteristics of ultrasound transducers, taking into account the operating temperature and other characteristics of a boiler drum, the cylindrical piezoelectric transducer (PETs) of separately-combined type was chosen, thermosetting piezomaterial - lithium niobate (permissible operating temperature 1160оС). It is proposed a model of the acoustic field radiator in the near and far zones of the radiation along the axis and also its divergence, that allows us to estimate the values of pressure, intensity and particle displacement of the acoustic field at any point of emission. It is investigated the characteristical and the directional diagram of transmitter Φ(φ) , on this basis it is defined the divergence angle of the beam 2φ =15,804 degree relative to which the radiation intensity will be 98% of the maximum value. a model of function of the relative acoustic pressure is proposed based on the angular and spatial distribution of the radiation intensity, based on the this the conversion factors for the transmitter and receiver are obtained. The values of the maximum (on the acoustic axis) and minimum (at an intensity of 98%) are obtained at the receiver output voltage PETs that for water is 0,1 mV and 0,2 mV for the steam. The resulting voltage levels allows to classify the received signal levels depending on the reflectance of the environment and hence determine fluid level in the boiler drum in the one radiation point during scanning the piezoelectric transducer.

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Keywords Sound field; radiation pattern; piezoplate; converter.
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