Zobrazeno 1 - 10
of 33
pro vyhledávání: '"K Ojasalo"'
Publikováno v:
Metrologia. 60:09003
Main text Results of Regional Metrology Organisation supplementary comparison AFRIMETS.AUV.A-S2 concerning the calibration of a Brüel & Kjær 4226 multi-frequency sound calibrator are reported here. Sound pressure level results at frequencies from 3
Autor:
Martti Heinonen, J. Nissila, Antti Manninen, K. Ojasalo, Mikko Ruoho, Emma Mykkänen, Ossi Hahtela
Publikováno v:
International Journal of Thermophysics. 36:3255-3271
In this work, a measurement system for high-temperature thermal-conductivity measurements has been designed, constructed, and characterized. The system is based on the $$3{\upomega }$$ method which is an ac technique suitable for both bulk and thin-f
Autor:
Peter M. Harris, K. Ojasalo, David A. Humphreys, Dongsheng Zhao, Faisal Mubarak, Manuel Rodriguez-Higuero
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 64:356-365
We investigate a principal component analysis approach for compressing the covariance matrices derived from real-time and sampling oscilloscope measurements. The objective of reducing the data storage requirements to scale proportional to the trace l
Akademický článek
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Publikováno v:
Helistö, P, Nissilä, J, Ojasalo, K, Penttilä, J S & Seppä, H 2003, ' AC voltage standard based on a programmable SIS array ', IEEE Transactions on Instrumentation and Measurement, vol. 52, no. 2, pp. 533-537 . https://doi.org/10.1109/TIM.2003.810462
An AC voltage standard is being developed based on phase sensitive detection of the amplitude of the fundamental frequency component of the output of a programmable Josephson voltage array. The setup is described and requirements for relative uncerta
Publikováno v:
29th Conference on Precision Electromagnetic Measurements (CPEM 2014).
Traceable calibration of high-speed communications test equipment face challenges. The propagation of uncertainty from primary waveform standards can be done by using a covariance matrix approach, which becomes impractical as the waveform data length
Autor:
Luca Callegaro, Massimo Ortolano, Leif Roschier, Ngoc Thanh Mai Tran, J. Kaasalainen, M. Casserly, Marian Kampik, Faranak Pourdanesh, Vincenzo D'Elia, Jari Penttilä, Andreas Elmholdt Christensen, Ville F. Maisi, J. Nissila, Dongseuk Kim, K. Ojasalo, Frederic Overney
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6c4d1c050f4d71c53be4fb22e726df50
http://hdl.handle.net/11583/2570946
http://hdl.handle.net/11583/2570946
Publikováno v:
Nissilä, J, Ojasalo, K, Maisi, V F, Kaasalainen, J, Behr, R & Manninen, A 2012, Preliminary Accuracy Investigation of an AC Voltage Standard Based on Square Wave Biased Josephson Voltage Reference . in 2012 Conference on Precision electromagnetic Measurements . IEEE Institute of Electrical and Electronic Engineers, pp. 58-59, 2012 Conference on Precision Electromagnetic Measurements, CPEM 2012, Washington, DC, United States, 1/07/12 . https://doi.org/10.1109/CPEM.2012.6250659
This paper describes the first measurement results with a square-wave based Josephson ac voltage standard. Using a planar multijunction thermal converter as a reference the accuracy was found to be in the µV/V range at 1 V level at 62.5 Hz and 1 kHz
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d478037e8d2702efabd2024ed0164a3a
https://cris.vtt.fi/en/publications/cc0b61d0-02b3-4aa6-a9ce-ce71fc0911f0
https://cris.vtt.fi/en/publications/cc0b61d0-02b3-4aa6-a9ce-ce71fc0911f0
Autor:
Ville F. Maisi, A. Kemppinen, J. Kaasalainen, J. Nissila, K. Ojasalo, T. Mansten, Antti Manninen
Publikováno v:
Nissilä, J, Maisi, V F, Kaasalainen, J, Ojasalo, K, Kemppinen, A, Mansten, T & Manninen, A 2008, Development of a square-wave based AC Josephson system for AC voltage metrology . in Proceedings of the 2008 Conference on Precision Electromagnetic Measurements Digest . IEEE Institute of Electrical and Electronic Engineers, CPEM Digest (Conference on Precision Electromagnetic Measurements), pp. 50-51, 2008 Conference on Precision Electromagnetic Measurements Digest, CPEM 2008, Broomfield, CO, United States, 8/06/08 . https://doi.org/10.1109/CPEM.2008.4574647
A square-wave based AC Josephson apparatus is under development at MIKES. A new high-resolution custom made sine wave source has been developed and is being tested. A simple scheme for calibration of thermal converters (TC) with an AC Josephson syste
Autor:
Antti Lassila, Eira Seppälä, K. Ojasalo, Matti Sarjala, Antti Manninen, Mikko J. Alava, Virpi Korpelainen
Publikováno v:
Scopus-Elsevier
Seppälä, E, Korpelainen, V, Ojasalo, K, Sarjala, M, Alava, M, Lassila, A & Manninen, A 2007, Dynamical Nonlinearities in Piezoelectric Materials . in J F Scott, V Gopalan, M Okuyama & M Bibes (eds), Symposium K – Ferroelectrics, Multiferroics, and Magnetoelectrics . Materials Research Society, Materials Research Society Symposia Proceedings, vol. 1034-K04-11, pp. 14-19, 2007 MRS Fall Meeting, Boston, MA, United States, 26/11/07 . https://doi.org/10.1557/PROC-1034-K04-11
Seppälä, E, Korpelainen, V, Ojasalo, K, Sarjala, M, Alava, M, Lassila, A & Manninen, A 2007, Dynamical Nonlinearities in Piezoelectric Materials . in J F Scott, V Gopalan, M Okuyama & M Bibes (eds), Symposium K – Ferroelectrics, Multiferroics, and Magnetoelectrics . Materials Research Society, Materials Research Society Symposia Proceedings, vol. 1034-K04-11, pp. 14-19, 2007 MRS Fall Meeting, Boston, MA, United States, 26/11/07 . https://doi.org/10.1557/PROC-1034-K04-11
Dynamical nonlinearities in piezoelectric materials have been investigated over different time and frequency scales using four different methods; measurements of displacement and electric polarization of bulk material, measurements of nanometer scale