Pressure sensor i.e. tire pressure sensor, for remote-interrogating detection of pressure wave, has electrode structure producing acoustic surface wave that is modulated based on pressure-dependent characteristic value of capacitor

摘要

The sensor (1) has a piezoelectric sensor element (2) i.e. surface acoustic wave wireless temperature sensor chip, comprising an electrode structure for producing an acoustic surface wave. The wave is modulated based on a pressure-dependent characteristic value of a pressure-loaded electronic component i.e. capacitor (4). A ceramic sensor housing accommodates the sensor element and the component, and comprises a ceramic basic substrate. The sensor element is made of piezoelectric crystal from a group of gallium orthophosphate, zinc oxide, langasite, langanite and langanate and/or quartz. An independent claim is also included for a method for detecting pressure by a pressure sensor.