Recent Progress in the Topologies of the Surface Acoustic Wave Sensors and the Corresponding Electronic Processing Circuits

Abstract

In this paper, we present an overview of the latest achievements in surface acoustic wave (SAW) sensors for gas or liquid fluid, with a focus on the electrodes’ topology and signal processing, as related to the application of the sensing device. Although the progress in this field is mainly due to advances in the materials science and the sensing coatings, the interdigital (IDT) electrodes’ organization is also an important tool for setting the acoustic-wave-distribution mode, and, thus, for improvement of the SAW performance. The signal-conditioning system is of practical interest, as the implementation of the SAW, as a compact and mobile system is dependent on this electronic circuit. The precision of the detection of the SAW platform is related not only to the IDT electrodes’ geometry but also to their location around the sensing layer. The most commonly used architectures are shown in the present paper. Finally, we identify the needs for the future improvement of these prospective sensors.

The Recent Development of Acoustic Sensors as Effective Chemical Detecting Tools for Biological Cells and Their Bioactivities

“…Moreover, other design considerations when selecting acoustic wave sensors include oscillator stability and noise level [ 57 ]. These sensors are capable of identifying and detecting substances at ppb levels of concentration [ 58 ]. The piezoelectric transducer characteristics, the center frequency, the sensor layer characteristics (such as material qualities, thickness, and surface roughness), and the operating temperature all affect sensitivity, which can be measured in Hz/ppm or Hz/% [ 59 ].…”

“…( b ) The sensation layer and reference layer complete SAW system. ( c ) The potential obtained spectrum from using different acoustic frequencies [ 54 , 58 , 62 ] (copyright permission no: 6895891235874).…”

Modeling and Investigation of Interdigital Transducers for Acoustofluidic Lab-Chip Devices

“…Рідинні мікросистеми загалом, і акустофлюїдні лаб-чипи зокрема, є мультидисциплінарними пристроями, для яких проєктування, виготовлення та застосування потребує знань з механіки твердого тіла та рідини, технології мікроелектроніки, хімії, біології та інших областей. Детальний огляд сучасних наукових публікацій щодо проблем застосування ПАХ в мікрофлюїдних лаб-чипах проведено в статтях [3,4]. Більшість публікацій присвячені використанню ПАХ для різних біомедичних застосувань а саме: поділ клітин, виявлення вірусів, бактеріальні біоплівки, моніторинг стовбурових клітин сухожиль, аналіз ДНК тощо.…”

Wave-based sensor responses with embedded electrode layouts

“…Acoustic wave-based piezoelectric sensors have emerged over the decades in multiple disciplines as an ideal candidate for structural health monitoring (SHM) methods because of their adjustable frequency range, easy processability, and wireless capability [1][2][3][4] . Evaluation of strain concentrations during the additive manufacturing process demands a micro-sized sensor that can detect meaningful information wirelessly to ensure quality.…”