Lukas Sigrist


Last Name

Sigrist

First Name

Lukas

ORCID

0000-0002-4983-8889

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2015 - 2019112020 - 20215
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Publications1 - 10 of 16
  • Harvesting-Aware Optimal Communication Scheme for Infrastructure-Less Sensing
    Item type: Journal Article
    Sigrist, Lukas; Ahmed, Rehan; Gomez, Andres; et al. (2020)
    ACM Transactions on Internet of Things
  • Design and Instrumentation of Environment-Powered Systems
    Item type: Doctoral Thesis
    Sigrist, Lukas (2020)
    Energy Harvesting presents a key technology to sustainably supply the billions of devices in the emerging Internet of Things (IoT). Converting physical signals such as radiation, temperature, vibration, etc. into electrical energy promises virtually unlimited energy to supply cyber-physical systems (CPSs) in a long-term and scalable manner. However, with an energy supply depending on a spatially and temporally variable environment significant non-determinism is introduced into the system. In this thesis we explore the potential and limitations of supplying cyber-physical systems (CPSs) from environmental energy using only minimal energy buffering. We introduce novel design methodologies to supply applications reliably and efficiently, explore the energy yield of thermoelectric harvesting, and optimize the utility of data transmissions in infrastructure-less monitoring. Furthermore, we introduce a testbed and measurement support to assist designers in design aspects arising in energy harvesting systems. Specifically, we make the following contributions: - We introduce a novel measurement tool that combines high accuracy and portability. Enabling joint in-situ observations of the ambient, multiple energy flows, and application states, it provides critical insights during the design and verification of energy harvesting systems. - We present a testbed for the emulation of radiation and temperature environments. In combination with a programmable, time- and event-triggered current sink, it enables fast and repeatable exploration, dimensioning and validation of energy harvesting system design aspects. - We introduce the first model for thermoelectric energy harvesting at the ground-to-air boundary that incorporates all components from the physical signal to the application. In combination with a newly proposed rectifier circuit, an optimized harvesting system is implemented. Extensive real-world evaluation attests the accuracy of the model and demonstrates unprecedented output power in the given harvesting scenario. - We propose a novel energy management principle that decouples the energy harvesting and electrical load using a minimal energy buffer to allow each end to operate at is optimal operating point. An energy management unit (EMU) implementing this principle is designed and extensively evaluated. Efficient and reliable operation is demonstrated, even when the input power is significantly lower than the application requirements and exhibiting high variability. - We study the utility of data transmitted in an infrastructure-less communication scenario supplied by energy harvesting. Using a model-based optimization approach, we derive a new data transmission scheme for long-term batteryless monitoring applications. Evaluation using a batteryless sensor nodes demonstrates accurate abstraction of the scenario using our model and significant gain in utility at minimal run-time overhead. The methods and solutions presented are implemented and extensively evaluated under lab and real-world conditions. From these, we conclude that the methods and design tools presented enable efficient design and thorough evaluation of energy harvesting systems.
  • Thermoelectric energy harvesting from gradients in the earth surface
    Item type: Journal Article
    Sigrist, Lukas; Stricker, Naomi; Bernath, Dominic; et al. (2020)
    IEEE Transactions on Industrial Electronics
  • SmarTEG: An Autonomous Wireless Sensor Node for High Accuracy Accelerometer-Based Monitoring
    Item type: Journal Article
    Magno, Michele; Sigrist, Lukas; Gomez, Andres; et al. (2019)
    Sensors
  • Design Support for Energy Harvesting Driven IoT Devices
    Item type: Conference Paper
    Sigrist, Lukas; Thiele, Lothar (2017)
    Aachener Informatik-Berichte ~ Proceedings of the IDEA League Doctoral School on Transiently Powered Computing
  • Environment and Application Testbed for Low-Power Energy Harvesting System Design
    Item type: Journal Article
    Sigrist, Lukas; Gomez, Andres; Leubin, Matthias; et al. (2021)
    IEEE Transactions on Industrial Electronics
    Energy harvesting systems strongly depend on the non-deterministic behavior of the environment. Systematic and thorough evaluation of these systems demands for tools that consistently reproduce these conditions and allow for closely integrating highly dynamic applications. To this end, a testbed is introduced that allows to precisely and repeatedly force an energy harvesting system under test using thermal and radiative sources in a controlled environment while allowing to sinking arbitrary current profiles. The coordinated control of the boundary conditions on the in- and output side enables detailed evaluation, exploration and dimensioning of different aspects of energy management and harvesting systems. By reproducing environmental traces at a higher rate than normally occurring in nature, the testbed allows to substantially shorten the time needed for experimental evaluations. This approach enables fast and consistent evaluation of energy harvesting systems under a wide coverage of operating conditions. © 2020 IEEE.
  • Mixed-criticality runtime mechanisms and evaluation on multicores
    Item type: Conference Paper
    Sigrist, Lukas; Giannopoulou, Georgia; Huang, Pengcheng; et al. (2015)
    21st IEEE Real-Time and Embedded Technology and Applications Symposium
  • RocketLogger - Mobile Power Logger for Prototyping IoT Devices
    Item type: Other Conference Item
    Sigrist, Lukas; Gomez, Andres; Lim, Roman; et al. (2016)
    Proceedings of the 14th ACM Conference on Embedded Networked Sensor Systems (SenSys '16)
    We demonstrate the RocketLogger, a mobile data logger designed for prototyping energy harvesting IoT devices. Novel IoT applications require new dataloggers with a highly increased dynamic range for current measurement to accommodate both ultra-low sleep currents of few nanoamperes as well as wireless communication currents in the range of hundreds of milliamperes. In parallel to ultra-low currents and high dynamic range measurements, novel applications require mobile measurements for easy in-situ characterization or wearable device testing. The RocketLogger is a solution that fulfills these requirements. While being fully mobile, it measures currents from 5 nA up to 500 mA with very fast and seamless range-switching. Using a sample energy harvesting application, we demonstrate its low-current measurement capabilities, fast, seamless auto-ranging and easy-to-use remote user interface.
  • Optimal Power Management With Guaranteed Minimum Energy Utilization For Solar Energy Harvesting Systems Technical Report
    Item type: Report
    Ahmed, Rehan; Buchli, Bernhard; Draskovic, Stefan; et al. (2019)
    Technical report
  • Dynamic Energy Burst Scaling for Transiently Powered Systems
    Item type: Conference Paper
    Gomez, Andres; Sigrist, Lukas; Magno, Michele; et al. (2016)
    Proceedings of the 2016 Design, Automation & Test in Europe Conference & Exhibition (DATE)
Publications1 - 10 of 16