Abstract
The new strain transducers presented in this paper consist of one or more piezoelectric elements, preferably quartz crystals, inside a cylindrical metal housing. The sensors are easily mounted into a small borehole of the desired depth by prestressing them with a nut. This allows longitudinal or transverse strains inside machine structures or tools to be measured. Examples are presented where the measured strain in the sensor is related to an external force or pressure acting on the structure. The sensors can be used at temperatures up to 400 °C.
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