Research Output 1984 2019

2017

Evaluation of Step Response of Transient Recorders for Lightning Impulse

Bergman, A., Elg, A-P. & Hällström, J., 2017, Proceedings.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

1 Citation (Scopus)

Fisheye camera method for spatial non-uniformity corrections in luminous flux measurements with integrating spheres

Kokka, A., Pulli, T., Poikonen, T., Askola, J. & Ikonen, E., 24 Jul 2017, In : Metrologia. 54, 4, p. 577-583 7 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
Electric lamps
Cameras
Fluxes
Light emitting diodes
Angular distribution

Influence of Coaxial Cable on Response of High-Voltage Resistive Divider

Bergman, A., Nordlund, M., Elg, A-P., Havunen, J., Hällström, J. & Meisner, J., 2017, Proceedings.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Initial results from the MIKES-Metsähovi time and frequency link

Wallin, A., Fordell, T., Calvés Molera, G., Mujunen, A., Myyry, J. & Näränen, J., 2017.

Research output: Contribution to conferenceOther conference contributionScientific

Measurement of the Internal Inductance of Impulse Voltage Generators and the Limits of LI Front Times

Larzelere, W., Hällström, J., Elg, A-P., Bergman, A., Klüss, J., Li, Y. & Zhou, L., 2017, Proceedings. 5 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Open Access
Inductance
Electric potential
Networks (circuits)
Impulse testing
Capacitance
3 Citations (Scopus)

Metrology in electricity and magnetism: EURAMET activities today and tomorrow

Piquemal, F., Jeckelmann, B., Callegaro, L., Hällström, J., Janssen, T. J. B. M., Melcher, J., Rietveld, G., Siegner, U., Wright, P. & Zeier, M., 4 Aug 2017, In : Metrologia. 54, 5, p. R1-R24

Research output: Contribution to journalReview ArticleScientificpeer-review

Open Access
Magnetism
Electricity
Metric system
Nanotechnology
Graphene
4 Citations (Scopus)

Optical voltage sensor for MV networks

Fusiek, G., Nelson, J., Niewczas, P., Havunen, J., Suomalainen, E. P. & Hallstrom, J., 21 Dec 2017, IEEE SENSORS 2017 - Conference Proceedings. Institute of Electrical and Electronic Engineers IEEE, Vol. 2017-December. p. 1-3 3 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Piezoelectric transducers
Voltage measurement
Sensors
Electric potential
Fiber Bragg gratings
2 Citations (Scopus)

Optimizing Temperature Coefficient and Frequency Response of Rogowski Coils

Lehtonen, T. A. & Hällstrom, J., 15 Oct 2017, In : IEEE Sensors Journal. 17, 20, p. 6646-6652 7 p., 8022679.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
frequency response
Frequency response
coils
coefficients
Temperature

Receiver-level robustness concepts for EGNSS timing services

Kirkko-Jaakkola, M., Thombre, S., Honkala, S., Söderholm, S., Kaasalainen, S., Kuusniemi, H., Zelle, H., Veerman, H., Wallin, A., Aarmo, K. A. & Boyero, J. P., 2017, 30th International Technical Meeting of the Satellite Division of the Institute of Navigation: ION GNSS 2017. Institute of Navigation ION, Vol. 5. p. 3353-3367 15 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Crystal oscillators
Critical infrastructures
Redundancy
Satellites
Testing

Rogowski coil with reduced immunity to conductor location and stray magnetic fields

Hällström, J., Ayhan, B., Suomalainen, E-P. & Valero, A., 2017, Proceedings.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

2 Citations (Scopus)

Spectroscopic thermometry for long-distance surveying

Tomberg, T., Fordell, T., Jokela, J., Merimaa, M. & Hieta, T., 10 Jan 2017, In : Applied Optics. 56, 2, p. 239-246 8 p.

Research output: Contribution to journalArticleScientificpeer-review

Thermometers
Surveying
temperature measurement
thermometers
Temperature measurement
1 Citation (Scopus)

Spin Resonance Clock Transition of the Endohedral Fullerene N 15 @ C60

Harding, R. T., Zhou, S., Zhou, J., Lindvall, T., Myers, W. K., Ardavan, A., Briggs, G. A. D., Porfyrakis, K. & Laird, E. A., 4 Oct 2017, In : Physical Review Letters. 119, 14, 140801.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
spin resonance
clocks
fullerenes
frequency stability
atomic clocks

Tarkka aikasynkronointi ja aikalinkit kriittisessä infrastruktuurissa

Wallin, A. E., 2017.

Research output: Contribution to conferenceOther conference contributionProfessional

The H2020 european project DEMETRA: Experimental time services based on European GNSS signals

Tavella, P., Sesia, I., Cerretto, G., Signorile, G., Calonico, D., Costa, R., Clivati, C., Cantoni, E., De Stefano, C., Frittelli, M., Formichella, V., Biserni, E., Leone, V., Zarroli, E., Sormani, D., Defraigne, P., Baire, Q., Gandara, M., Hamoniaux, V., Varriale, E. & 21 others, Morante, Q., Widomski, T., Kaczmarek, J., Uzycki, J., Borgulski, K., Olbrysz, P., Kowalski, J., Gliwka, K., Cernigliaro, A., Fiasca, F., Perucca, A., Facca, M., Dhiri, V., Veiga, M. T., Suarez, T., Diaz, J., Mangiantini, M., Wallin, A., Galleani, L., Whibberly, P. & Hindley, D., 27 Oct 2017, Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS). Institute of Electrical and Electronic Engineers IEEE, p. 475-476 2 p. 8088930

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

satellite navigation systems
Signal systems
Navigation
Satellites
European Union

Timekeeping and network time transfer

Wallin, A., 2017.

Research output: Contribution to conferenceConference articleScientific

4 Citations (Scopus)

Traceable Coulomb blockade thermometry

Hahtela, O., Mykkänen, E., Kemppinen, A., Meschke, M., Prunnila, M., Gunnarsson, D., Roschier, L., Penttilä, J. & Pekola, J., 1 Feb 2017, In : Metrologia. 54, 1, p. 69-76 8 p.

Research output: Contribution to journalArticleScientificpeer-review

Coulomb blockade
Temperature
Digital voltmeters
Thermodynamics
Temperature scales

Using Deconvolution for Correction of Non-Ideal Step Response of Lightning Impulse Digitizers and Measurement Systems

Havunen, J., Hällström, J., Bergman, A. & Bergman, A. E., 2017, Proceedings.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

2018

An optical atomic clock using a single 171Yb+ ion with a characterisation of thermal systematic effects

Baynham, C., Curtis, E. A., Godun, R. M., Jones, J. M., Nisbet-Jones, P. B. R., Baird, P. E. G., Gill, P., Fordell, T. & Lindvall, T., 1 Jul 2018, Book of abstracts of the 50th Anniversary EGAS conference. p. 81 1 p.

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

2 Citations (Scopus)

Application of Charge-Sensitive Preamplifier for the Calibration of Partial Discharge Calibrators Below 1 pC

Havunen, J. & Hällström, J., 2018, CPEM 2018 - Conference on Precision Electromagnetic Measurements. Institute of Electrical and Electronic Engineers IEEE, 2 p. 643

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

calibration
software
services
method

A Simple High-Performance Remote-Maser Concept

Fordell, T. & Wallin, A., 2018, 2018 European Frequency and Time Forum (EFTF): Abstracts. p. 143

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

Comparison of Sampling Voltage Measurements of Multi-Tone Signals

Sira, M., Diaz De Aguilar, J., Öztürk, T., Lee, J., Behr, R. & Nissilä, J., 2018, CPEM 2018 - Conference on Precision Electromagnetic Measurements. Institute of Electrical and Electronic Engineers IEEE, 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Voltage measurement
Sampling
Electric potential
1 Citation (Scopus)

Development of white LED illuminants for colorimetry and recommendation of white LED reference spectrum for photometry

Kokka, A., Poikonen, T., Blattner, P., Jost, S., Ferrero, A., Pulli, T., Ngo, M., Thorseth, A., Gerloff, T., Dekker, P., Stuker, F., Klej, A., Ludwig, K., Schneider, M., Reiners, T. & Ikonen, E., 28 Jun 2018, In : Metrologia. 55, 4, p. 526-534 9 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
Colorimetry
Photometry
Light emitting diodes
Photometers
Calibration

Driving a Josephson Junction Array with a Mode-Locked Laser and a Photodiode

Nissilä, J., Fordell, T., Kieler, O. & Behr, R., 2018, CPEM 2018 - Conference on Precision Electromagnetic Measurements. Institute of Electrical and Electronic Engineers IEEE, 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Josephson junctions
photodiodes
lasers
pulse rate
pulse generators

Effect of Coaxial Cables on Measurements Performed with Resistive Lightning Impulse Voltage Dividers

Havunen, J., Passon, S., Hällström, J. & Bergman, A., 19 Oct 2018, CPEM 2018 - Conference on Precision Electromagnetic Measurements. Institute of Electrical and Electronic Engineers IEEE, 2 p. 8501140

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Voltage dividers
Coaxial cables
Lightning
Electric potential
Cables

Experience with Current Transformer Calibration System Based on Rogowski Coil

Suomalainen, E-P. & Hällström, J., 2018, CPEM 2018 - Conference on Precision Electromagnetic Measurements. Institute of Electrical and Electronic Engineers IEEE, 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Electric instrument transformers
transformers
coils
Calibration
Ferromagnetic materials

Fabrication and Studies of Silicide-Based Superconducting Nanowires

Lehtinen, J., Mykkänen, E., Kemppinen, A., Prunnila, M. & Manninen, A., 2018, CPEM 2018 - Conference on Precision Electromagnetic Measurements. Institute of Electrical and Electronic Engineers IEEE, 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

nanowires
fabrication
nanofabrication
crossovers
slip

Hajautetut vikasietoiset kelloverkot

Translated title of the contribution: Distributed fault-tolerant clock networksWallin, A., Lindvall, T. & Hanhijärvi, K., 2018, 12 p. (Maanpuolustuksen tieteellinen neuvottelukunta. Raporttisarja B).

Research output: Book/ReportReport

Open Access
rabbits
1 Citation (Scopus)

Harmonic Power Standard of VTT MIKES

Lehtonen, T., 2018, CPEM 2018 - Conference on Precision Electromagnetic Measurements. Institute of Electrical and Electronic Engineers IEEE, 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Voltage dividers
Function generators
Voltage measurement
Transconductance
Electric current measurement

Improved systematic and random errors for long-distance time-transfer using PTP White Rabbit

Wallin, A., Rizzi, M., Calvés, G. M., Fordell, T. & Näränen, J., 2018.

Research output: Contribution to conferenceConference AbstractScientificpeer-review

Initial results from the MIKES-Metsähovi time and frequency link for the VGOS radio telescope

Molera Calvés, G., Näränen, J., Fordell, T. & Wallin, A., 2018, (Accepted/In press) IVS Publications: General Meeting Proceedings.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

radio telescopes
clocks
hydrogen masers
time signals
very long base interferometry

Methods for Electrical Cooling and Thermometry of a Suspended Silicon Chip

Kemppinen, A., Mykkänen, E., Lehtinen, J., Shchepetov, A., Timofeev, A., Gunnarsson, D., Grönberg, L., Manninen, A. & Prunnila, M., 2018, CPEM 2018 - Conference on Precision Electromagnetic Measurements. Institute of Electrical and Electronic Engineers IEEE, 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

coolers
tunnel junctions
conductive heat transfer
temperature measurement
heat flux

Multiple transfer standard for calibration and characterization of test setups for LED lamps and luminaires in industry

Sperling, A., Meyer, M., Pendsa, S., Jordan, W., Poikonen, T., Renoux, D. & Blattner, P., 2 Feb 2018, In : Metrologia. 55, 2, p. S37-S42

Research output: Contribution to journalArticleScientificpeer-review

Lighting fixtures
Electric lamps
Light emitting diodes
Calibration
Industry
8 Citations (Scopus)

Relationships between junction temperature, electroluminescence spectrum and ageing of light-emitting diodes

Vaskuri, A., Kärhä, P., Baumgartner, H., Kantamaa, O., Pulli, T., Poikonen, T. & Ikonen, E., 15 Mar 2018, In : Metrologia. 55, 2, p. S86-S95

Research output: Contribution to journalArticleScientificpeer-review

Open Access
Electroluminescence
Light emitting diodes
Aging of materials
Temperature
Electric lamps

Results of an International Comparison of Instrument Current Transformers up to 10 kA at 50 Hz Frequency

Draxler, K., Styblíková, R., Hlavacek, J., Rietveld, G., van den Brom, H. E., Schnaitt, M., Waldmann, W., Dimitrov, E., Cincar-Vujovic, T., Paczek, B., Sadkowski, G., Crotti, G., Martin, R., Garnacho, F., Blanc, I., Kämpfer, R., Mester, C., Wheaton, A., Mohns, E., Bergman, A. & 4 others, Hammarquist, M., Çayci, H., Hällström, J. & Suomalainen, E-P., 2018, CPEM 2018 - Conference on Precision Electromagnetic Measurements. Institute of Electrical and Electronic Engineers IEEE, 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

transformers
revenue
electric power
metrology
alternating current
4 Citations (Scopus)

Superconducting MoSi nanowires

Lehtinen, J. S., Kemppinen, A., Mykkänen, E., Prunnila, M. & Manninen, A. J., 1 Jan 2018, In : Superconductor Science and Technology. 31, 1, 015002.

Research output: Contribution to journalArticleScientificpeer-review

Nanowires
nanowires
wire
Wire
Rapid thermal annealing

Towards distributed fault-tolerant timekeeping based on a WR-network

Wallin, A., 2018.

Research output: Contribution to conferenceConference AbstractScientific

Clocks
Multiplexing
Kalman filters
Hardware
2019

Application of Charge-Sensitive Preamplifier for the Calibration of Partial Discharge Calibrators below 1 pC

Havunen, J. & Hällström, J., 1 Jun 2019, In : IEEE Transactions on Instrumentation and Measurement. 68, 6, p. 2034-2040 7 p., 8640062.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
preamplifiers
Partial discharges
Calibration
Signal to noise ratio
signal to noise ratios

Broadband lasers for photo-ionization and repumping of trapped ions

Fordell, T. & Lindvall, T., 2019, In : Journal of the Optical Society of America B: Optical Physics. 36, 2, p. 415-420

Research output: Contribution to journalArticleScientificpeer-review

photoionization
broadband
lasers
DBR lasers
ions
1 Citation (Scopus)

Current Step Generation and Measurement with Nanosecond Rise Time using Coaxial Cable Generator

Rehman, M. Z., Hallstrom, J. & Havunen, J., 14 Feb 2019, 2018 IEEE International Conference on High Voltage Engineering and Application: ICHVE 2018. Institute of Electrical and Electronic Engineers IEEE, 8642188. (ICHVE 2018 - 2018 IEEE International Conference on High Voltage Engineering and Application).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Coaxial cables
Electric sparks
Sensors
Calibration
Geometry

Harmonic Power Standard of VTT MIKES

Lehtonen, T. A., 1 Jun 2019, In : IEEE Transactions on Instrumentation and Measurement. 68, 6, p. 2047-2052 6 p., 8556073.

Research output: Contribution to journalArticleScientificpeer-review

harmonics
Voltage dividers
Function generators
Voltage measurement
Transconductance

Intercomparison of reference measuring systems for lightning impulses between three National Metrology Institutes

Meisner, J., Elg, A. P., Hallstrom, J., Passon, S., Havunen, J., Bergman, A. & Nordlund, M., 14 Feb 2019, 2018 IEEE International Conference on High Voltage Engineering and Application: ICHVE 2018. Institute of Electrical and Electronic Engineers IEEE, 8642002. (ICHVE 2018 - 2018 IEEE International Conference on High Voltage Engineering and Application).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Lightning
Electric potential
Uncertainty
1 Citation (Scopus)

Metrology for very fast current transients

Passon, S., Havunen, J., Meisner, J. & Kurrat, M., 13 Feb 2019, 2018 IEEE International Conference on High Voltage Engineering and Application: ICHVE 2018. Institute of Electrical and Electronic Engineers IEEE, 4 p. 8641787. (ICHVE 2018 - 2018 IEEE International Conference on High Voltage Engineering and Application).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Calibration
Cables
Sensors
Electric potential
Electric sparks

Precision Calibration System for Partial Discharge Calibrators

Havunen, J. & Hällström, J., 8 Aug 2019, Proceedings of the 26th Nordic Insulation Symposium, NORD-IS 19. p. 6-9 (Proceedings of the Nordic Insulation Symposium, Vol. 26).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Open Access
Partial discharges
Calibration
Uncertainty

Validation of the fisheye camera method for spatial non-uniformity corrections in luminous flux measurements with integrating spheres

Kokka, A., Pulli, T., Ferrero, A., Dekker, P., Thorseth, A., Kliment, P., Klej, A., Gerloff, T., Ludwig, K., Poikonen, T. & Ikonen, E., 18 Jun 2019, In : Metrologia. 56, 4, 045002.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
Cameras
Fluxes
Electric lamps
Light emitting diodes