Patent ID: 7988351

Claim:
A device comprising: at least one piezoacoustic resonator element ( 2 ) having a piezoelectric layer ( 32 ); and two electrodes that are contacted electrically with the piezoelectric layer ( 32 ), wherein the piezoacoustic resonator element ( 2 ) is configured in such a manner that, upon voltage being applied to the piezoelectric layer ( 32 ), a bulk acoustic wave of the piezoelectric layer ( 32 ) is induced with a resonant frequency by way of the electrodes, further comprising a temperature measuring device ( 3 ) implemented to be integrated with the piezoacoustic resonator element ( 2 ) being present, which includes a measuring element implemented using thin film technology, the temperature measuring device ( 3 ) and the piezoacoustic resonator element ( 2 ) being embodied using thin film technology (Fn) on a common carrier substrate ( 35 ) and an electrode of the resonator element ( 2 ) and the temperature measuring device ( 3 ) being arranged as layers on the carrier substrate ( 35 ), with a layer thickness of the temperature measuring device amounting <25 μm and the device being configured as a sensor element for detecting a substance with a piezoacoustic resonator element ( 2 ), whereby the piezoacoustic resonator element ( 2 ) has a surface section for sorption of the substance and the output signal from the resonator element ( 2 ) is dependent on the sorption of the substance, with an acoustic mirror ( 36 ) being arranged between the piezoacoustic resonator element ( 31 ) and the carrier substrate ( 35 ), in order to amplify the acoustic signal, the temperature measuring device ( 3 ) being positioned at such a position of the sensor element that the temperature measuring device ( 3 ) is in contact with a measuring medium during the measuring process of the sensor element, in which the substance to be detected is located, and that the measuring element, the temperature measuring device ( 3 ) and also a heating element of the heating facility can be operated, with an external evaluation device ( 4 ) or evaluation device implemented to be integrated in the device being provided to determine the temperature from the change in resistance of the measuring element as a function of the temperature, by means of which the balance conditions of the sorption of the substance to be detected on the surface section of the piezoacoustic resonator element ( 2 ) are targetedly controlled by controlling the temperature.