Abstract: A device and method for real-time measurement using acoustic wave sensors, without the measurement being altered by environmental conditions such as temperature, humidity, flow or pressure, and without requiring the use of external gauges. The proposed method and device improve the stability and detection limit of quartz crystal microbalance (QCM) sensors. The method and device are based on the high degree of correlation between acoustic resonators integrated into a single piezoelectric substrate. The use of a reference sample to correct the instability of the baseline is not required. The method and device are intended for the industrial sector of the production of measuring devices based on quartz crystals.

Abstract: A method and device for characterizing the response of resonant sensors. The method is based on an analytic algorithm that establishes a relationship between the complex admittance G of the sensor, measured at a single test frequency, the variations in resonance frequency and the losses, such as the quality factor at the acoustic resonator. The device includes at least one piezoelectric resonator on whose surface is deposited a thin layer of material, a fluid medium in contact therewith, a stable signal source, a frequency synthesis subsystem, a multiplex subsystem that enables the excitation/interrogation of a particular resonator, a signal conditioning and acquisition subsystem, a control subsystem based on the use of digital integrated circuits enabling the coordinated control of the different subsystems that make up the device.