Unconventional Protocol for SAW Sensor: Multi-Physic Response Enrichment in Liquid Medium

Spectral measurements with hybrid LMR and SAW platform for dual parameter sensing

“…In further LW-SAW signal analysis, the shift of the S 11 reflection and S 21 transmission parameters are considered (Δ S 11 and Δ S 21, respectively), with their values in air as reference and taking into account a time-gating post-process in order to focus on the direct acoustic signal, excluding any parasitic ones such as reflections or electrical influence. 2…”

“…In another approach it is sometimes possible to enrich the signal of a single device, as proposed with surface acoustic wave devices, thus providing a multi-response with mechanical but also electrical sensitivity, that can be separated by using two readout frequencies or a time-gating technique. 2…”

“…In another approach it is sometimes possible to enrich the signal of a single device, as proposed with surface acoustic wave devices, thus providing a multi-response with mechanical but also electrical sensitivity, that can be separated by using two readout frequencies or a time-gating technique. 2 Techniques such as surface plasmon resonance (SPR), lossy mode resonance (LMR) or Love waves surface acoustic waves (LW-SAW), among others, can be combined to obtain information related to both optical and mechanical parameters such as the refractive index and the viscosity of the fluids that come into contact with the sensor. There are several detailed reports in the last decade of successful attempts to combine optical and acoustic techniques such as SPR and LW-SAW.…”

Trends and Applications of Surface and Bulk Acoustic Wave Devices: A Review

“…SAW devices are usually electrically characterized by their scattering parameters (Sparameters), S ij corresponding to the output power at port i divided by the input power at port j, or transmission gain from port j to port i. Figure 5 gives an example of the characterization results of a SAW delay line (two-port device) such as those used by Rubé, M et al [29], measured with a vector network analyzer (VNA) in the frequency domain. It exhibits a resonance at about 118 MHz, with a sharp dip in the reflection parameter S 11 , which corresponds to a maximum of S 21 , the transmission being supported by an acoustic wave between ports.…”

“…Figure 5 gives an example of the characterization results of a SAW delay line (two-port device) such as those used by Rubé, M et al [ 29 ], measured with a vector network analyzer (VNA) in the frequency domain. It exhibits a resonance at about 118 MHz, with a sharp dip in the reflection parameter S 11 , which corresponds to a maximum of S 21 , the transmission being supported by an acoustic wave between ports.…”