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SAL Science & Stories No. 14 / September 2020
Content
  1. Successful SAL Roadshow in Graz
  2. CEA-Tech and SAL agree to cooperate on cutting-edge research projects
  3. SAL and TDK join forces to adapt existing NFC technology
  4. New paper: Computationally efficient model for viscous damping in perforated MEMS structures
  5. Project call for cooperative research: Pre-estimation of radiated electromagnetic interference (EMI) of Electronic Based Systems (PREMI)
  6. Laying of Foundation Stone for SAL Building in Graz
  7. Professor Thomas Hain held a guest lecture at SAL Linz


A message from Gerald Murauer, Executive Director of SAL

During a successful roadshow in Graz, SAL interacted with dozens of experts from the Styrian EBS industry in "world cafés", where we discussed how to work together to tackle current challenges. In the beginning of September, we were delighted to welcome the decision-makers from one of the most successful and largest research player in Europe, CEA-Tech. During the two days visit and the discussions, it became again clear once again that we can only strengthen Austria as an international research player by working together.

Successful SAL Roadshow in Graz
SAL Roadshow Graz On September 17, we invited members of the industry to join us at the SAL Roadshow in order to discuss potential challenges and projects in the area of Electronic Based Systems. Participants from around 15 companies followed our invitation. With regard of COVID-19 measures, we had fruitful discussions and learned more about the needs of the Styrian industry.

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CEA-Tech and SAL agree to cooperate on cutting-edge research projects

Stéphane Siebert, director and CEO of CEA-Tech, the technology research unit of the French Atomic Energy and Alternative Energy Commission (CEA), together with the CEOs of CEA-Leti and CEA-List, visited SAL to talk about potential cooperation with Gerald Murauer. During his visit, he also met Federal Minister Eleonore Gewessler and section chief Weissenburger as well as representatives from TU Graz and companies. 

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SAL and TDK join forces to adapt existing NFC technology
TDK SAL
Together with TDK Electronics, we are currently working on ultrasonic energy and bidirectional data transmission through solid walls (see figure below). We are adapting existing NFC technology to use acoustic instead of electromagnetic waves.

A pair of piezo transducers is used to establish an acoustic channel inside a solid wall. This enables non-invasive data and energy transmission even through conductive materials which block RF electromagnetic radiation. Extensive experimental and theoretical work has been done to better understand the acoustical channel and identify possible optimization opportunities. For example, wave propagation, acoustic impedance and transducer mounting techniques have been investigated. Theoretical models have been developed in cooperation with CiSMAT research centre from FH Kärnten. Electrical impedance matching has also been implemented to allow NFC frontend to work with piezo transducers.

A working acoustic NFC demonstrator is already able to achieve data and energy transmission through thick stainless steel wall using a reader and a sensor connected to coaxially coupled pair of ~200 µm thick PZT discs from TDK with a diameter of 7 mm. On the Acoustic NFC sensor side an energy harvesting circuit uses the energy transmitted through acoustic channel to power its microcontroller and the environmental sensors to measure temperature, relative humidity and ambient pressure.Next steps include development of detachable piezo mounting methods, device miniaturization, increase of NFC communication data rate and design of application specific sensor solutions.

For any questions or application ideas please feel free to contact us.


New paper: Computationally efficient model for viscous damping in perforated MEMS structures
SAL's Jaroslaw Kaczynski and Clement Fleury, together with Christian Ranacher (Infineon Technologies Austria), wrote a paper on "Computationally efficient model for viscous damping in perforated MEMS structures", which was published in Sensors and Actuators A: Physical.

In this work an analytical model for the flow resistance for viscous air damping in a MEMS structure comprising a perforated plate in close proximity to a solid plate is developed. Such a configuration is widely used for oscillating MEMS sensors and actuators. It was shown that in addition to the resistance caused by the perforation hole and by squeeze film damping between the two plates, an additional resistance in the intermediate region caused by the redirection of the flow between the perforation hole region and the squeeze film region also has to be considered. The overall flow resistance is the sum of the flow resistance of several regions. The models for the individual regions have been derived analytically for the squeeze film damping and using numerical solutions of the Navier-Stokes equation for the perforation hole and the intermediate region. The validity of the derived damping model is limited to cases where the Knudsen number is smaller than 0.1, the porosity is smaller than 0.9 and the ratio between gap height of the two plates and the perforation hole radius is larger than 0.1 and squeeze number σ<<1 – which is typical dimensions MEMS structures. The presented model covers an extended geometry range compared to previously reported damping models.

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Project call for cooperative research: Pre-estimation of radiated electromagnetic interference (EMI) of Electronic Based Systems (PREMI)

Electromagnetic compatibility testing is often neglected in the development cycles of Electronic Based Systems of the future and is subsequently carried out at high costs after the prototype has been manufactured. The SAL project PREMI - Pre-estimation of radiated electromagnetic interference (EMI) of Electronic Based Systems - can be a solution to this challenge. We will revolutionize existing methods in modeling, simulation and measurement. This gives our partners the possibility to accelerate the development of new technologies and face future challenges.

Partner call open

Start of the project: Q3 2020

Contact: contact@silicon-austria.com

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Laying of Foundation Stone for SAL Building in Graz
SAL Building On September 14, the foundation stone for the new Data House and our SAL building (Silicon Austria Labs building) was laid at Campus Inffeldgasse of Graz University of Technology (TU Graz) in the presence of TU Graz Rector Harald Kainz, Mayor Siegfried Nagl, SFG Managing Director Christoph Ludwig, SAL Executive Director Gerald Murauer and Hans-Peter Weiss, CEO of the Federal Real Estate Company (BIG).

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Professor Thomas Hain held a guest lecture at SAL Linz
Do machines finally understand us? Thomas Hain, Professor for Computer Science at the Univer­sity of Shef­field, gave a talk on approaches and challenges of Spoken Language Tech­no­lo­gies. The guest lecture was co-spon­sored by Silicon Austria Labs, IEEE Austria COM/​MTT Joint Chapter & Johannes Kepler Universität Linz.



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