Zobrazeno 1 - 10
of 57
pro vyhledávání: '"Ville Heikkinen"'
Autor:
Yassir Arezki, Rong Su, Ville Heikkinen, François Leprete, Pavel Posta, Youichi Bitou, Christian Schober, Charyar Mehdi-Souzani, Bandar Abdulrahman Mohammed Alzahrani, Xiangchao Zhang, Yohan Kondo, Christof Pruss, Vit Ledl, Nabil Anwer, Mohamed Lamjed Bouazizi, Richard Leach, Hichem Nouira
Publikováno v:
Sensors, Vol 21, Iss 4, p 1103 (2021)
The design of innovative reference aspheric and freeform optical elements was investigated with the aim of calibration and verification of ultra-high accurate measurement systems. The verification is dedicated to form error analysis of aspherical and
Externí odkaz:
https://doaj.org/article/5e208ae826204d198959010b0780b38d
Autor:
Lauri Korhonen, Inka Pippuri, Petteri Packalén, Ville Heikkinen, Matti Maltamo, Juho Heikkilä
Publikováno v:
Metsätieteen aikakauskirja, Vol 2013, Iss 2 (2013)
Externí odkaz:
https://doaj.org/article/32f868f27e9d4775926fe01dac26546f
Autor:
Mohamed Lamjed Bouazizi, Bandar Alzahrani, Youichi Bitou, Vít Lédl, Nabil Anwer, Xiangchao Zhang, Hichem Nouira, Ville Heikkinen, Yassir Arezki, Yohan Kondo, Rong Su, Christof Pruss, Charyar Mehdi-Souzani, Richard Leach, François Leprete, Pavel Posta, Christian Schober
Publikováno v:
Arezki, Y, Su, R, Heikkinen, V, Leprete, F, Posta, P, Bitou, Y, Schober, C, Mehdi-Souzani, C, Alzahrani, B A M, Zhang, X, Kondo, Y, Pruss, C, Ledl, V, Anwer, N, Bouazizi, M L, Leach, R & Nouira, H 2021, ' Traceable reference full metrology chain for innovative aspheric and freeform optical surfaces accurate at the nanometer level ', Sensors, vol. 21, no. 4, 1103, pp. 1-19 . https://doi.org/10.3390/s21041103
Sensors
Volume 21
Issue 4
Sensors (Basel, Switzerland)
Sensors, Vol 21, Iss 1103, p 1103 (2021)
Sensors
Volume 21
Issue 4
Sensors (Basel, Switzerland)
Sensors, Vol 21, Iss 1103, p 1103 (2021)
The design of innovative reference aspheric and freeform optical elements was investigated with the aim of calibration and verification of ultra-high accurate measurement systems. The verification is dedicated to form error analysis of aspherical and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bedaa2faff879e1240ca4dee18864a81
http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-126758
http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-126758
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:
Ville Heikkinen
Publikováno v:
IEEE Transactions on Image Processing. 27:3358-3373
This paper explores hyperspectral reflectance factor estimation using Gaussian process regression with multispectral- and trichromatic measurements. Estimations are performed in visible- (400-700 nm) or visible-near infrared (400-980 nm) wavelength r
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
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
Autor:
Markku Keinänen, Sarita Keski-Saari, Markku Nygren, Laure Fauch, Tapani Hirvonen, Lars Granlund, Ilkka Porali, Katri Himanen, Elina Oksanen, Markku Hauta-Kasari, Jennifer Dumont, Jouni Hiltunen, Maxime Mistretta, Ville Heikkinen
Publikováno v:
Computers and Electronics in Agriculture. 116:118-124
Hyperspectral and thermal lifetime imaging were used to assess spruce seed quality.Viable, empty and infested seeds were resolved with high accuracy with both methods.400-1000nm data was not as informative as 1000-2500nm and thermal decay data.Classi
Autor:
Ville Heikkinen, Antti Lassila, Jeremias Seppä, Tor Paulin, Edward Hæggström, Ivan Kassamakov, Anton Nolvi
Publikováno v:
Heikkinen, V, Kassamakov, I, Seppä, J, Paulin, T, Nolvi, A, Lassila, A & Hæggström, E 2015, ' Traceable methods for vertical scale characterization of dynamic stroboscopic scanning white-light interferometer measurements ', Applied Optics, vol. 54, no. 35, pp. 10397-10403 . https://doi.org/10.1364/AO.54.010397
Stroboscopic scanning white-light interferometry (SSWLI) can be used for 3D imaging of oscillating samples. It allows measurement of micrometer to millimeter size samples with nanometer vertical precision. Unlike coherent light source systems the SSW