Aqueous fill good`s e.g. packed food, pressure/temperature measuring sensor, has high pressure-fixed acoustic source provided with temperature and/or pressure-dependent resonant frequency and freely arranged in fill goods

摘要

The sensor has a high pressure-fixed acoustic source (4) provided with a temperature and/or pressure-dependent resonant frequency and freely arranged in fill goods (2). The acoustic source has a piezoelectric unit (5) serving as an actuator, which is connected with an acoustic transducer to transfer an oscillation. The acoustic source has a resonance generator (7) to operate the piezoelectric unit with an operating frequency, where the operating frequency is same as mechanical resonant frequency of the piezoelectric unit. An independent claim is also included for a method for measuring pressure and temperature of fill goods.