Condition monitoring systems for machinery comprise dozens or even hundreds of vibration and temperature sensors. Designing multi-purpose sensors measuring various parameters is an urgent task in instrument making industry.
Nowadays, due to high reliability and temperature tolerance sensors made of piezoceramic materials become widely spread. The piezoceramic sensors are intended to measure force, pressure, acceleration, humidity, temperature and flowrate. But, for example, force sensors use direct piezo-effect comprising change of charge value at the opposite surfaces of a crystal caused by tensile or compressive forces.
Temperature measurement by means of piezo-crystal, as a rule, is based on anisotropy – by selecting a particular piezo-element slice orientation in relation to crystallographic axis one can change its thermal frequency response (TFR) which, generally, is a non-linear temperature function.
The paper is devoted to development of a method for temperature evaluation by means of piezoceramic vibration transducer. The paper reveals the results of development and testing of vibration/temperature piezo-sensor. Temperature measurement error within the whole vibration measurement range does not exceed ±1ºС in case when the air temperature range varies from –40ºС to +100ºС.
Kostyukov V.N., Kostyukov Al.V., Boyarnikov A.V. Multifunctional sensors made of piezoceramic materials // Dinamika sistem, mehanizmov i mashin (Dynamics of systems, mechanisms and machines). - Omsk: OmSTU, 2014. - Iss. 4. - p. 135-138.
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