Zobrazeno 1 - 10
of 86
pro vyhledávání: '"Antti Lassila"'
Autor:
Linus Teir, Tuomas Lindstedt, Thomas Widmaier, Björn Hemming, Uwe Brand, Michael Fahrbach, Erwin Peiner, Antti Lassila
Publikováno v:
Sensors, Vol 21, Iss 17, p 5955 (2021)
Long slender piezoresistive silicon microprobes are a new type of sensor for measurement of surface roughness. Their advantage is the ability to measure at speeds of up to 15 mm/s, which is much faster than conventional stylus probes. The drawbacks a
Externí odkaz:
https://doaj.org/article/22b96b3516304b33925c264140329673
Autor:
Jan Sher Akmal, Mika Salmi, Björn Hemming, Linus Teir, Anni Suomalainen, Mika Kortesniemi, Jouni Partanen, Antti Lassila
Publikováno v:
Applied Sciences, Vol 10, Iss 8, p 2968 (2020)
In craniomaxillofacial surgical procedures, an emerging practice adopts the preoperative virtual planning that uses medical imaging (computed tomography), 3D thresholding (segmentation), 3D modeling (digital design), and additive manufacturing (3D pr
Externí odkaz:
https://doaj.org/article/7d17dc88b6ea4e2c891e40ec0c550fe6
Autor:
Aleksandr Aleksandrovich Danilenko, Masoud Rastgou, Farshid Manoocheri, Jussi Kinnunen, Virpi Korpelainen, Antti Lassila, Erkki Ikonen
Publikováno v:
Danilenko, A, Rastgou, M, Manoocheri, F, Kinnunen, J, Korpelainen, V, Lassila, A & Ikonen, E 2023, ' Characterization of PillarHall test chip structures using a reflectometry technique ', Measurement Science and Technology, vol. 34, no. 9, 094006 . https://doi.org/10.1088/1361-6501/acda54
Thin film samples where one of the thin layers consists of vacuum or air are called PillarHalls due to their support structure in silicon wafers. Custom PillarHall samples were provided by manufacturer and characterized by reflectometry with spectrom
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ee569c1a20907cd1503c98102833e275
https://cris.vtt.fi/en/publications/31675d25-26e3-42c8-90bc-185a4ce6f009
https://cris.vtt.fi/en/publications/31675d25-26e3-42c8-90bc-185a4ce6f009
Publikováno v:
Heikkinen, V, Nysten, J, Byman, V, Hemming, B & Lassila, A 2020, ' Multi-sensor optical profilometer for measurement of large freeforms at nm-level uncertainty ', Surface Topography: Metrology and Properties, vol. 8, no. 4, 045030 . https://doi.org/10.1088/2051-672X/abd293
Optical measurement of large freeform samples is often limited by the resolution, size and slope limits of measurement devices. This trade-off can be solved using stitching—which, however, creates several difficulties often linked to accuracy of mo
Autor:
Ralf D Geckeler, Matthias Schumann, Andreas Just, Michael Krause, Antti Lassila, Ville Heikkinen
Publikováno v:
Geckeler, R D, Schumann, M, Just, A, Krause, M, Lassila, A & Heikkinen, V 2022, ' A comparison of traceable spatial angle autocollimator calibrations performed by PTB and VTT MIKES ', Metrologia, vol. 59, no. 2, 024002 . https://doi.org/10.1088/1681-7575/ac42b9
Autocollimators are versatile devices for angle metrology used in a wide range of applications in engineering and manufacturing. A modern electronic autocollimator generally features two measuring axes and can thus fully determine the surface normal
Autor:
Jan Sher Akmal, Mika Salmi, Björn Hemming, Linus Teir, Anni Suomalainen, Mika Kortesniemi, Jouni Partanen, Antti Lassila
Publikováno v:
Akmal, J S, Salmi, M, Hemming, B, Teir, L, Suomalainen, A, Kortesniemi, M, Partanen, J & Lassila, A 2020, ' Cumulative inaccuracies in implementation of additive manufacturing through medical imaging, 3D thresholding, and 3D modeling : A case study for an end-use implant ', Applied Sciences, vol. 10, no. 8, 2968 . https://doi.org/10.3390/APP10082968
Applied Sciences, Vol 10, Iss 2968, p 2968 (2020)
Applied Sciences, Vol 10, Iss 2968, p 2968 (2020)
Featured Application Accuracy of additively manufactured implants for clinical surgery. Abstract In craniomaxillofacial surgical procedures, an emerging practice adopts the preoperative virtual planning that uses medical imaging (computed tomography)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::1bb9314e523d586220cdbb2974efc1ac
https://cris.vtt.fi/en/publications/c89b84b8-78cd-44bf-83bb-d2a455a74e28
https://cris.vtt.fi/en/publications/c89b84b8-78cd-44bf-83bb-d2a455a74e28
Autor:
Antti Lassila, Faith Hungwe, Vladimir Kosteev, Gian Bartolo Picotto, Lukasz Slusarski, Laura Carcedo, Michael Matus, Olena Flys, Murat Aksulu, Uwe Brand
Publikováno v:
Brand, U, Matus, M, Carcedo, L, Slusarski, L, Picotto, G B, Lassila, A, Hungwe, F, Flys, O, Aksulu, M & Kosteev, V 2020, ' Measurement of groove depth standards in the range 1 μm up to 1 mm (EURAMET project 1407) ', Metrologia, vol. 57, no. 1 A, 04001 . https://doi.org/10.1088/0026-1394/57/1A/04001
A comparison measurement between 10 national metrology institutes on two types of depth setting standards was conducted using mostly tactile but also two optical instruments for measurement. Three etched silicon standards with depths of 5, 20 and 50
Publikováno v:
Heikkinen, V, Byman, V, Palosuo, I, Hemming, B & Lassila, A 2017, ' Interferometric 2D small angle generator for autocollimator calibration ', Metrologia, vol. 54, no. 3, pp. 253-261 . https://doi.org/10.1088/1681-7575/aa648d
Small angle generators are simple devices for providing small angles traceable to the definition of the SI-unit radian. The most accurate ones use a laser interferometer for measurement of angular displacement. Small angle generators used for autocol
Intercomparison of flatness measurements of an optical flat at apertures of up to 150 mm in diameter
Autor:
M Schulz, L Svedova, M Vannoni, D Putland, S Quabis, R Bergmans, F Hungwe, Zbigniew Ramotowski, Petr Křen, M Pérez, Y Kang, P. Balling, E. Prieto, A Küng, M Asar, Antti Lassila, H Piree, G Ehret, D Williams
Publikováno v:
Quabis, S, Schulz, M, Ehret, G, Asar, M, Balling, P, Kren, P, Bergmans, R H, Küng, A, Lassila, A, Putland, D, Williams, D, Pirée, H, Prieto, E, Pérez, M, Svedova, L, Ramotowski, Z, Vannoni, M, Hungwe, F & Kang, Y 2017, ' Intercomparison of flatness measurements of an optical flat at apertures of up to 150 mm in diameter ', Metrologia, vol. 54, no. 1, pp. 85-93 . https://doi.org/10.1088/1681-7575/aa535c
Recently, a scientific comparison of flatness measuring instruments at European National Metrology Institutes (NMIs) was performed in the framework of EURAMET. The specimen was a well-polished optical surface with a maximum measurement aperture of 15
Autor:
Michael Krause, Ville Byman, Ralf D. Geckeler, Andreas Just, Ville Heikkinen, Maksim Shpak, Antti Lassila, Matthias Schumann
Publikováno v:
Heikkinen, V, Byman, V, Shpak, M, Geckeler, R, Just, A, Krause, M, Schumann, M & Lassila, A 2019, High-Accuracy autocollimator calibration by interferometric 2D angle generator . in L Assoufid, H Ohashi & A K Asundi (eds), Advances in Metrology for X-Ray and EUV Optics VIII ., 1110903, International Society for Optics and Photonics SPIE, Proceedings of SPIE, vol. 11109, Advances in Metrology for X-Ray and EUV Optics VIII 2019, San Diego, United States, 11/08/19 . https://doi.org/10.1117/12.2531023
Autocollimators are excellent measuring tools for many applications, such as adjustments or characterizations of precision mechanics, optics and instruments. Autocollimators have several characteristic error sources due to misalignment or nonideality