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Measurement of Parameters of Piezoelectric Knock Sensors
Buchtík, Jaromír ; Málek, Petr (referee) ; Fialka, Jiří (advisor)
The first part of the bachelor thesis focuses on knock sensors. It deals with their use in industry on engines in biogas power plants, but also as part of internal combustion engines in vehicles. Furthermore, the work deals with the piezoelectric charge coefficient 33, as one of the main parameters to describe the piezoelectric element and the theory of its measurement methods. The second part of the work focuses on the measurement of individual elements. It begins with the measurement of simpler undamaged shapes, such as a disk or wafer. This was followed by the measurement of the ring-shaped element, which is the shape used in the sensor itself. Measurements were carried out both on bare rings and on screwed sensors or factory-sealed in plastic, from undamaged, to broken, chipped, cracked to loaded problems. The purpose of the work was to compare the measured data and find out whether it is possible to know whether the piezoceramic element in the sensor is damaged, or in what way
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