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Publications (10 of 12) Show all publications
Rusu, C., Bader, S., Oelmann, B., Alvandpour, A., Enoksson, P., Braun, T., . . . Liljeholm, J. (2019). Challenges for Miniaturised Energy Harvesting Sensor Systems. In: 2018 10th International Conference on Advanced Infocomm Technology, ICAIT 2018: . Paper presented at 10th International Conference on Advanced Infocomm Technology, ICAIT 2018, 12 August 2018 through 15 August 2018 (pp. 214-217). Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>Challenges for Miniaturised Energy Harvesting Sensor Systems
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2019 (English)In: 2018 10th International Conference on Advanced Infocomm Technology, ICAIT 2018, Institute of Electrical and Electronics Engineers Inc. , 2019, p. 214-217Conference paper, Published paper (Refereed)
Abstract [en]

Harvesting ambient energy, as an alternative power source, tackles the increasing demand for future energy-efficient autonomous sensor systems, especially for applications requiring miniaturisation and distributed sensing such Wireless Sensors Network and Internet-of-Things. A functional energy harvesting system requires addressing simultaneously all the components of the system: the harvester device, the energy storage and the powering management circuits. These components are described through examples of miniaturized kinetic-based harvesting systems for low-power applications with focus on energy harvester, piezoelectric and electromagnetic, respectively.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2019
Keywords
autonomous sensor systems, kinetic harvester, miniaturised energy harvesting, piezoelectric harvester, RPM sensor, supercapacitor, variable reluctance, Energy efficiency, Magnetic storage, Piezoelectricity, Wireless sensor networks, Autonomous sensors, Distributed sensing, Energy harvesting sensors, Energy harvesting systems, Low power application, Wireless sensors networks, Energy harvesting
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-38923 (URN)10.1109/ICAIT.2018.8686695 (DOI)2-s2.0-85064729034 (Scopus ID)9781538679364 (ISBN)
Conference
10th International Conference on Advanced Infocomm Technology, ICAIT 2018, 12 August 2018 through 15 August 2018
Note

Funding details: Horizon 2020 Framework Programme, 644378; Funding details: 20140323; Funding text 1: The authors gratefully acknowledge financial support of the work from „Smart-Memphis‟ project under European Union‟s Horizon 2020 research and innovation programme (grant no. 644378), the Knowledge Foundation fund ASIS (no. 20140323) and the Sweden‟s Innovation Agency, Vinnova, grant Challenge-Driven Innovation „Energy Toolkit‟ (nr. 2017-03725).

Available from: 2019-06-10 Created: 2019-06-10 Last updated: 2019-08-01Bibliographically approved
Köhler, E., Johannisson, P., Kolev, D., Ohlsson, F., Ågren, P., Liljeholm, J., . . . Rusu, C. (2019). MEMS meander harvester with tungsten proof-mass. In: Journal of Physics: Conference Series. Paper presented at 18th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2018, 4 December 2018 through 7 December 2018. Institute of Physics Publishing (1)
Open this publication in new window or tab >>MEMS meander harvester with tungsten proof-mass
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2019 (English)In: Journal of Physics: Conference Series, Institute of Physics Publishing , 2019, no 1Conference paper, Published paper (Refereed)
Abstract [en]

Using current battery technology the life-time of a leadless pacemaker is approximately 6-10 years, with a large portion of the pacemaker occupied by the battery. This paper investigates the possibility to use a MEMS piezoelectric harvester as a complementary energy source in leadless pacemakers. The challenge is to combine the low resonance frequency required to harvest energy from a heartbeat with the small volume of 20×4×3 mm3 available, with the corresponding harvester displacement restricted to 2 mm. Due to the displacement restriction the selected structure was a double clamped bridge in order to reduce the mass displacement, with various meander-type designs simulated to reduce resonance frequency. To further reduce resonance frequency large proof-masses of tungsten were attached by gluing. Two types of tungsten proof-masses were added to four different harvesters, 16.4 mg and 16.6 mg on sample 1 and 2 and 502 mg and 492 mg proof-mass on sample 3 and 4. The structures have 2 μm patterned PZT (deposited by sol-gel technique) and Pt metal electrodes for d31 mode harvesting. The power output measured from one of the two PZT/electrodes was 0.13 nW with 50 μm deflection at 100 k Ω optimal load resistance and 9.1 mVpp at 232 Hz.

Place, publisher, year, edition, pages
Institute of Physics Publishing, 2019
Keywords
Electric batteries, Harvesters, Nanotechnology, Natural frequencies, Sol-gels, Tungsten, Battery technology, Complementary energy, Large proof mass, Low resonance frequency, Mass displacement, Piezoelectric harvester, Resonance frequencies, Sol-gel technique, Energy conversion
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-43363 (URN)10.1088/1742-6596/1407/1/012121 (DOI)2-s2.0-85077813433 (Scopus ID)
Conference
18th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2018, 4 December 2018 through 7 December 2018
Note

Funding details: 644378; Funding text 1: This work has received funding from The European Union’s Horizon 2020 research and innovation programme under grant agreement No 644378, Smart-Memphis project.

Available from: 2020-01-29 Created: 2020-01-29 Last updated: 2020-01-29Bibliographically approved
Rusu, C., Krozer, A., Johansson, C., Ahrentorp, F., Pettersson, T., Jonasson, C., . . . Montagnoli, A. (2019). Miniaturized wireless water content and conductivity soil sensor system. Computers and Electronics in Agriculture, 167, Article ID 105076.
Open this publication in new window or tab >>Miniaturized wireless water content and conductivity soil sensor system
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2019 (English)In: Computers and Electronics in Agriculture, ISSN 0168-1699, E-ISSN 1872-7107, Vol. 167, article id 105076Article in journal (Refereed) Published
Abstract [en]

Obtaining more data for the research/studies of plants growing may be easier realized when suitable non-destructive detection methods are available. We are here presenting the development of a miniaturised, low-power, real-time, multi-parameter and cost-effective sensor for measurements in mini plugs (growth of seedling). The detection technique is based on measurement of electrical impedance at two frequencies for sensing two soil parameters, water content and water conductivity (dependent on e.g. total ions concentration). Electrical models were developed and comply with data at two frequencies. An easy and efficient calibration method for the sensor is established by using known liquids’ properties instead of various soil types. The measurements show a good correlation between the sensor's readings and the traditional soil testing. This soil sensor can easily send data wirelessly allowing for spot checks of substrate moisture levels throughout a greenhouse/field, and/or enable sensors to be buried inside the soil/substrate for long-term consecutive measurements.

Place, publisher, year, edition, pages
Elsevier B.V., 2019
Keywords
Easy calibration soil sensor, Miniaturised soil sensor, Multi-parameter electrical impedance, Soil water conductivity, Soil water content, Calibration, Cost effectiveness, Electric impedance, Electric impedance measurement, Parameter estimation, Soil moisture, Soil testing, Calibration method, Consecutive measurements, Cost-effective sensors, Electrical impedance, Nondestructive detection, Soil sensors, Soil water conductivities, Soil surveys
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-40919 (URN)10.1016/j.compag.2019.105076 (DOI)2-s2.0-85075369301 (Scopus ID)
Note

Funding details: 308313, 783221; Funding text 1: This work is partially funded by EU-FP7-ENV grant Zephyr – Zero-impact innovative technology in forest plant production (grant agreement No 308313 ) and by ECSEL JU grant AFarCloud – Aggregate Farming in the Cloud (grant agreement No 783221 ).

Available from: 2019-12-10 Created: 2019-12-10 Last updated: 2019-12-10Bibliographically approved
Vyas, A., Staaf, H., Rusu, C., Ebefors, T., Liljeholm, J., Smith, A., . . . Enoksson, P. (2018). A micromachined coupled-cantilever for piezoelectric energy harvesters. Micromachines, 9(5), Article ID 252.
Open this publication in new window or tab >>A micromachined coupled-cantilever for piezoelectric energy harvesters
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2018 (English)In: Micromachines, ISSN 2072-666X, E-ISSN 2072-666X, Vol. 9, no 5, article id 252Article in journal (Refereed) Published
Abstract [en]

This paper presents a demonstration of the feasibility of fabricating micro-cantilever harvesters with extended stress distribution and enhanced bandwidth by exploiting an M-shaped two-degrees-of-freedom design. The measured mechanical response of the fabricated device displays the predicted dual resonance peak behavior with the fundamental peak at the intended frequency. This design has the features of high energy conversion efficiency in a miniaturized environment where the available vibrational energy varies in frequency. It makes such a design suitable for future large volume production of integrated self powered sensors nodes for the Internet-of-Things

Place, publisher, year, edition, pages
MDPI AG, 2018
Keywords
Bandwidth broadening, Coupled cantilevers, Enhanced stress distribution, Finite element modeling, Lead zirconate titanate, Microelectromechanical systems (MEMS), Piezoelectric micro-energy harvester, Bandwidth, Conversion efficiency, Degrees of freedom (mechanics), Display devices, Electromechanical devices, Energy harvesting, Finite element method, MEMS, Piezoelectricity, Stress concentration, High energy conversions, Micro electromechanical system (MEMS), Micro energy, Piezoelectric energy harvesters, Two degrees of freedom, Vibrational energies, Nanocantilevers
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-40182 (URN)10.3390/mi9050252 (DOI)2-s2.0-85060995701 (Scopus ID)
Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2020-02-07Bibliographically approved
Johannisson, P., Ohlsson, F. & Rusu, C. (2018). Impact-driven up-conversion in piezoelectric MEMS energy harvesters with pulsed excitation. In: Journal of Physics: Conference Series. Paper presented at 17th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2017, 14 November 2017 through 17 November 2017. (1), Article ID 012106.
Open this publication in new window or tab >>Impact-driven up-conversion in piezoelectric MEMS energy harvesters with pulsed excitation
2018 (English)In: Journal of Physics: Conference Series, 2018, no 1, article id 012106Conference paper, Published paper (Refereed)
Abstract [en]

The potential of impact-driven frequency up-conversion in a MEMS EH is evaluated using numerical simulations. The investigated design is compared to a conventional cantilever EH in terms of output power and loss rate. The upshifting can lead to significantly increased output power at a similar loss rate but as the time scale for the loss is long, the benefit is limited. This also requires an effective upshifting process. The design of the impact introduces a length scale that must be selected with excitation, gravity, and pre-stress taken into account. This makes this type of EH application-dependent as a non-optimal choice may result in low output power.

Keywords
Frequency converters, Nanotechnology, Energy Harvester, Frequency up conversion, Length scale, Optimal choice, Output power, Piezoelectric MEMS, Pulsed excitation, Up conversion, Energy conversion
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34960 (URN)10.1088/1742-6596/1052/1/012106 (DOI)2-s2.0-85051348585 (Scopus ID)
Conference
17th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2017, 14 November 2017 through 17 November 2017
Available from: 2018-09-05 Created: 2018-09-05 Last updated: 2019-06-27Bibliographically approved
Ohlsson, F., Johannisson, P. & Rusu, C. (2018). Shape effects in doubly clamped bridge structures at large deflections. In: Journal of Physics: Conference Series. Paper presented at 17th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2017, 14 November 2017 through 17 November 2017. , 1052(1)
Open this publication in new window or tab >>Shape effects in doubly clamped bridge structures at large deflections
2018 (English)In: Journal of Physics: Conference Series, 2018, Vol. 1052, no 1Conference paper, Published paper (Refereed)
Abstract [en]

The shape of a doubly clamped bridge structure depends on its deflection. At large deflections, where the system exhibits nonlinear behaviour, the shape effect becomes significant. We present a general method, based on variational analysis, for computing corrections to the nominal linear regime shape function. The method is used to compute the first non-trivial correction and quantify the corresponding improvement in the large deflection regime. The model obtained is also validated using FEM simulations.

Keywords
Energy conversion, Nanotechnology, Bridge structures, FEM simulations, General method, Large deflection, Linear regime, Nonlinear behaviours, Shape functions, Variational analysis, Deflection (structures)
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34959 (URN)10.1088/1742-6596/1052/1/012109 (DOI)2-s2.0-85051341507 (Scopus ID)
Conference
17th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2017, 14 November 2017 through 17 November 2017
Available from: 2018-08-27 Created: 2018-08-27 Last updated: 2019-06-27Bibliographically approved
Larsson, S., Johannisson, P., Kolev, D., Ohlsson, F., Nik, S., Liljeholm, J., . . . Rusu, C. (2018). Simple method for quality factor estimation in resonating MEMS structures. In: Proceedings of the 17th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, 2017: . Paper presented at 17th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2017, 14 November 2017 through 17 November 2017. (1)
Open this publication in new window or tab >>Simple method for quality factor estimation in resonating MEMS structures
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2018 (English)In: Proceedings of the 17th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, 2017, 2018, no 1Conference paper, Published paper (Refereed)
Abstract [en]

The quality factor of a packaged MEMS resonating structure depends on both the packaging pressure and the structure's proximity to the walls. This type of mechanical constraints, which causes energy dissipation from the structure to the surrounding air, are applicable for oscillating energy harvesters and should be considered in the design process. However, the modelling of energy losses or the measurements of their direct influence inside a packaged chip is not trivial. In this paper, a simple experimental method to quantify the energy loss in an oscillating MEMS structures due to the surrounding air is described together with preliminary results. The main advantage of the method is the ability to characterize the damping contributions under different vacuum and packaging conditions without requiring any packaging of the harvester chip or fabrication of multiple devices with different cavity depths. © Published under licence by IOP Publishing Ltd.

Keywords
Energy conversion, Energy dissipation, Nanotechnology, Damping contribution, Energy Harvester, Experimental methods, Mechanical constraints, Multiple devices, Quality factor estimation, Quality factors, Resonating structures, Chip scale packages
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34961 (URN)10.1088/1742-6596/1052/1/012100 (DOI)2-s2.0-85051331110 (Scopus ID)
Conference
17th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2017, 14 November 2017 through 17 November 2017
Available from: 2018-08-28 Created: 2018-08-28 Last updated: 2019-06-27Bibliographically approved
Arndt, H., Burkard, S., Talavera, G., Garcia, J., Castells, D., Codina, M., . . . Carrabina, J. (2017). Real-time constant monitoring of fall risk index by means of fully-wireless insoles. In: : . Paper presented at 14th International Conference on Wearable Micro and Nano Technologies for Personalized Health, pHealth 2017. 14 May 2017 through 16 May 2017 (pp. 193-197).
Open this publication in new window or tab >>Real-time constant monitoring of fall risk index by means of fully-wireless insoles
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2017 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Constant monitoring of gait in real life conditions is considered the best way to assess Fall Risk Index (FRI) since most falls happen out of the ideal conditions in which clinicians are currently analyzing the patient's behavior. This paper presents the WIISEL platform and results obtained through the use of the first full-wireless insole devices that can measure almost all gait related data directly on the feet (not in the upper part of the body as most existing wearable solutions). The platform consists of a complete tool-chain: insoles, smartphone & app, server & analysis tool, FRI estimation and user access. Results are obtained by combining parameters in a personalized way to build individual fall risk index assessed by experts with the help of data analytics. New FRI has been compared with standards that validate the quality of its prediction in a statistically significant way. That qualitatively relevant information is being provided to the platform users, being either end-users/patients, relatives or caregivers and the related clinicians to ideally assess about their long term evolution. © 2017 The authors and IOS Press.

Keywords
Fall risk, Fall Risk Index (FRI), Gait analysis, Wireless insole, caregiver, doctor patient relation, foot, gait, human, monitoring, prediction, relative, smartphone
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-31175 (URN)10.3233/978-1-61499-761-0-193 (DOI)2-s2.0-85019478635 (Scopus ID)9781614997603 (ISBN)
Conference
14th International Conference on Wearable Micro and Nano Technologies for Personalized Health, pHealth 2017. 14 May 2017 through 16 May 2017
Available from: 2017-08-23 Created: 2017-08-23 Last updated: 2019-06-18Bibliographically approved
Johannisson, P., Ohlsson, F. & Rusu, C. (2016). Multi-axis piezoelectric energy harvesting using MEMS components with slanted beams. Paper presented at 16th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS 2016), December 6-9, 2016, Paris, France. Journal of Physics, Conference Series, 773(1), Article ID 012080.
Open this publication in new window or tab >>Multi-axis piezoelectric energy harvesting using MEMS components with slanted beams
2016 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 773, no 1, article id 012080Article in journal (Refereed) Published
Abstract [en]

During the manufacturing of MEMS components, slanted beams can be produced in the etching process. We show that this can be used to produce skew motion that causes deflection of a proof mass out of the device plane also when the excitation is confined to the device plane. This allows construction of an energy harvester that uses a planar manufacturing process and produces power also with in-plane excitation. To obtain this with traditional methods it would be necessary to manufacture separate components and then mount them with their sensitive axes orthogonal to each other.

Keywords
Energy conversion, Manufacture, Nanotechnology, Energy Harvester, Etching process, Manufacturing process, Multi-Axis, Piezoelectric energy harvesting, Proof mass, Slanted beams, Energy harvesting
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-32557 (URN)10.1088/1742-6596/773/1/012080 (DOI)2-s2.0-85009820189 (Scopus ID)
Conference
16th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS 2016), December 6-9, 2016, Paris, France
Available from: 2017-11-08 Created: 2017-11-08 Last updated: 2019-06-27Bibliographically approved
Montagnoli, A., Terzaghi, M., Fulgaro, N., Stoew, B., Wipenmyr, J., Ilver, D., . . . Chiatante, D. (2016). Non-destructive phenotypic analysis of early stage tree seedling growth using an automated stereovision imaging method. Frontiers in Plant Science, 7, Article ID 1644.
Open this publication in new window or tab >>Non-destructive phenotypic analysis of early stage tree seedling growth using an automated stereovision imaging method
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2016 (English)In: Frontiers in Plant Science, ISSN 1664-462X, E-ISSN 1664-462X, Vol. 7, article id 1644Article in journal (Refereed) Published
Abstract [en]

A plant phenotyping approach was applied to evaluate growth rate of containerized tree seedlings during the precultivation phase following seed germination. A simple and affordable stereo optical system was used to collect stereoscopic red-green-blue (RGB) images of seedlings at regular intervals of time. Comparative analysis of these images by means of a newly developed software enabled us to calculate (a) the increments of seedlings height and (b) the percentage greenness of seedling leaves. Comparison of these parameters with destructive biomass measurements showed that the height traits can be used to estimate seedling growth for needle-leaved plant species whereas the greenness trait can be used for broad-leaved plant species. Despite the need to adjust for plant type, growth stage and light conditions this new, cheap, rapid, and sustainable phenotyping approach can be used to study large-scale phenome variations due to genome variability and interaction with environmental factors.

Keywords
Biomass, Fagus sylvatica L, Picea abies L, Pinus sylvestris L, Plant phenotype, Quercus ilex L, RGB image analysis, Seedlings
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-32564 (URN)10.3389/fpls.2016.01644 (DOI)2-s2.0-84994646159 (Scopus ID)
Available from: 2017-11-08 Created: 2017-11-08 Last updated: 2019-06-18Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-0459-1157

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