Surface Acoustic Wave (SAW) Torque and Temperature Solution

Surface Acoustic Wave (SAW) torque and temperature solution 

Proven sensor technology for highly accurate measurement of torque, force, pressure and temperature.

A wireless, passive, sensing system consisting of three main elements: SAW sensing elements connected to antennas known as RF Couplers mounted on the part to be measured, and an electronic interrogation unit called a reader, connected to its stationary RF coupler. The reader generates and transmits an interrogation signal across the RF Coupler to the sensing element. The sensing element is excited by this RF signal creating a Surface Acoustic Wave (SAW) on the surface of a Piezoelectric substrate between the fingers of an interdigital transducer (IDT). The IDT reflects the SAW back to the reader. The frequency of this reflected signal is affected by the physical measurement of either strain or temperature in the sensing element. The reader analyses the received signal and calculates the value of the physical measurement.