A wireless interrogation system exploiting narrowband acoustic resonator for remote physical quantity measurement.

Supplementary material – A frequency modulated wireless interrogation system exploiting narrowband acoustic resonator for remote physical quantity measurement

Note: A frequency modulated wireless interrogation system exploiting narrowband acoustic resonator for remote physical quantity measurement.

We demonstrate the wireless conversion of frequency modulation to amplitude modulation by radio frequency resonators as means of accurately determining the resonance frequency of passive acoustoelectronic sensors. The emitted frequency modulated radio frequency pulses are generated by a pulsed radar for probing a surface acoustic wave based sensor. The sharp sign transition of the amplitude mod...

Characterisation of a Wireless Passive Surface Acoustic Wave Strain Sensor

Wirelessly interrogated surface acoustic wave (SAW) sensors can operate passively and in harsh conditions reliably. The interrogation process of the signal measurement chain provides the power to excite the sensor and hence establish the sensors response in a passive manner. Development of wireless passive SAW sensors allows investigation of their potential to quantify physical measurands such ...

Analysis and Validation of Contactless Time-Gated Interrogation Technique for Quartz Resonator Sensors

A technique for contactless electromagnetic interrogation of AT-cut quartz piezoelectric resonator sensors is proposed based on a primary coil electromagnetically air-coupled to a secondary coil connected to the electrodes of the resonator. The interrogation technique periodically switches between interleaved excitation and detection phases. During the excitation phase, the resonator is set int...

High-Temperature SAW Wireless Strain Sensor with Langasite

Two Surface acoustic wave (SAW) resonators were fabricated on langasite substrates with Euler angle of (0°, 138.5°, 117°) and (0°, 138.5°, 27°). A dipole antenna was bonded to the prepared SAW resonator to form a wireless sensor. The characteristics of the SAW sensors were measured by wireless frequency domain interrogation methods from 20 °C to 600 °C. Different temperature behaviors of the se...