The 2019 surface acoustic waves roadmap

Today, surface acoustic waves (SAWs) and bulk acoustic waves are already two of the very few phononic technologies of industrial relevance and can been found in a myriad of devices employing these nanoscale earthquakes on a chip. Acoustic radio frequency filters, for instance, are integral parts of wireless devices. SAWs in particular find applications in life sciences and microfluidics for sensing and mixing of tiny amounts of liquids. In addition to this continuously growing number of applications, SAWs are ideally suited to probe and control elementary excitations in condensed matter at the limit of single quantum excitations. Even collective excitations, classical or quantum are nowadays coherently interfaced by SAWs. This wide, highly diverse, interdisciplinary and continuously expanding spectrum literally unites advanced sensing and manipulation applications. Remarkably, SAW technology is inherently multiscale and spans from single atomic or nanoscopic units up even to the millimeter scale. The aim of this Roadmap is to present a snapshot of the present state of surface acoustic wave science and technology in 2019 and provide an opinion on the challenges and opportunities that the future holds from a group of renown experts, covering the interdisciplinary key areas, ranging from fundamental quantum effects to practical applications of acoustic devices in life science

The 2019 surface acoustic waves roadmap

Abstract Today, surface acoustic waves (SAWs) and bulk acoustic waves are already two of the very few phononic technologies of industrial relevance and can been found in a myriad of devices employing these nanoscale earthquakes on a chip. Acoustic radio frequency filters, for instance, are integral parts of wireless devices. SAWs in particular find applications in life sciences and microfluidics for sensing and mixing of tiny amounts of liquids. In addition to this continuously growing number of applications, SAWs are ideally suited to probe and control elementary excitations in condensed matter at the limit of single quantum excitations. Even collective excitations, classical or quantum are nowadays coherently interfaced by SAWs. This wide, highly diverse, interdisciplinary and continuously expanding spectrum literally unites advanced sensing and manipulation applications. Remarkably, SAW technology is inherently multiscale and spans from single atomic or nanoscopic units up even to the millimeter scale. The aim of this Roadmap is to present a snapshot of the present state of surface acoustic wave science and technology in 2019 and provide an opinion on the challenges and opportunities that the future holds from a group of renown experts, covering the interdisciplinary key areas, ranging from fundamental quantum effects to practical applications of acoustic devices in life science.EU Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Grant Agreement No. 642688 (SAWtrain)

CryoSense: Redesign using advanced technology

This Technical Note contains a study of advanced sensor technologies for a cryogenic benchmark experiment. The benchmark experiment is a redesign of baseline experiment 2 presented in Technical Note 4 of the activity, with state-of-the-art ‘conventional’ sensor technologies now replaced by alternative measurement methods. In a comprehensive study different technologies are first described, then evaluated in terms of application potential and specifically adapted TRL scale. This includes: Particle Velocimetry, Ultrasound Tomography, specialised ultrasound methods (Lamb-Waves, Quasi-Scholten-Waves), Electrical Capacitance Tomography, Optical Tomography, Time of Flight Cameras, Wire-Mesh Sensors and Microwave/RF-methods. The intended application in this Note is the detection of free surface topologies of cryogenic liquids (fill level, dynamics due to external acceleration, boiling at the free surface). Recommendations regarding required experimental test to increase technology readiness level conclude the sensor study and lead to the presentation of possible sensor layouts of the redesigned experiment. The need for basic (breadboard) cryogenic tests in the domain of ultrasound transducers and electrical capacitance tomography is demonstrated, since feasibility/performance data are required for furnishing dependable sensor and measurement chain setups

Influence of the substrate on the overall sensor impedance of planar H₂ sensors involving TiO₂–SnO₂ interfaces

To date, very little has been written about the influence of the substrate layer on the overall sensor impedance of single- and multilayer planar sensors (e.g., metal-oxide sensors). However, the substrate is an elementary part of the sensor element. Through the selection of a substrate, the sensor performance can be manipulated. The current contribution reports on the substrate influence in multilayer metal-oxide chemical sensors. Measurements of the impedance are used to discuss the sensor performance with quartz substrates, (laboratory) glass substrates and substrates covered by silicon-dioxide insulating layers. Numerical experiments based on previous measurement results show that inexpensive glass substrates contribute up to 97% to the overall sensor responses. With an isolating layer of 200 nm SiO₂, the glass substrate contribution is reduced to about 25%

CryoSense: Redesign using alternative measurement methods

This Technical Note contains the design of a cryogenic benchmark experiment, introducing alternate measurement methods such as ultrasound tomography or electric capacitance tomography. The benchmark experiment is a redesign of baseline experiment 1 presented in Technical Note 1 of the activity, with state-of-the-art "conventional" sensor technologies now replaced by alternative measurement methods. In a comprehensive study different technologies are first described, then evaluated in terms of application potential and specifically adapted TRL scale. This includes: Ultrasound Tomography, Electrical Resistance Tomography, Electrical Capacitance Tomography, Optical Tomography, Time of Flight Cameras, Nuclear Magnetic Resonance Tomography, Wire-Mesh Sensors, Computed X-Ray Tomography and Neutron Absorption. The intended application in this Note is the detection of gas bubbles within cryogenic liquids. After assessment of parasitic heating, microgravity compatibility and cryogenic compatibility, trade-offs are performed between sensors of the same type. Recommendations regarding and increase in technology readiness level conclude the sensor study and lead to the presentation of the sensor layouts of the redesigned experiment. Finally, the sensor study recommendations are translated into an overview test matrix as a suggestion for a step-wise sensor validation

State determination of catalytic converters based on an ultra-wideband communication system

A novel microwave-based approach for monitoring the state of aftertreatment systems such as diesel particulate filters (DPFs), three-way catalytic converters (TWCs), and selective catalytic reduction (SCR) catalysts is proposed. The volume inside the metallic housing of the DPF, TWC, or SCR is considered as a wireless communication channel between two terminals of a communication system. It is shown that, depending on the transmission channel characteristics, the properties of the catalyst, such as the catalyst state, can be inferred. This is done by means of an ultra-wideband (UWB) measurement and the subsequent evaluation and processing of the waveform in the time and frequency domains

Sensorcluster fuer extreme Umgebungsbedingungen. Teilvorhaben: OFW-Sensorik Abschlussbericht

Available from TIB Hannover: F01B677+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman