Výsledky vyhledávání - "Pekka Suopajärvi"

3D Printed Lenses for Vertical Beam Collimation of Optical Phased Arrays

Autor: Sidra Tul Muntaha, Ari Hokkanen, Mikko Harjanne, Matteo Cherchi, Pekka Suopajärvi, Petri Karvinen, Markku Pekkarinen, Matthieu Roussey, Timo Aalto

Publikováno v: Muntaha, S, Hokkanen, A, Harjanne, M, Cherchi, M, Suopajärvi, P, Karvinen, P, Pekkarinen, M, Roussey, M & Aalto, T 2023, ' 3D Printed Lenses for Vertical Beam Collimation of Optical Phased Arrays ', 3D Printing and Additive Manufacturing . https://doi.org/10.1089/3dp.2022.0314

This article presents the design, fabrication, and characterization of edge-coupled 1D optical phased arrays (OPAs) combined with collimating lenses. Our concept was tested with two OPAs having different collimation ranges. Both OPA designs have 3-μ

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::790199db88aacacc0db3d1eeffe0d7ad
https://doi.org/10.1089/3dp.2022.0314

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Compact, Real-time Analyser for C-13 and O-18 Isotope Ratios of Carbon Dioxide in Breath Air

Autor: Hannu Vasama, Teemu Kääriäinen, Pekka Suopajärvi, Rami Aikio, Albert Manninen, Eero Hietala, Craig Richmond

Publikováno v: Kääriäinen, T, Hietala, E, Aikio, R, Vasama, H, Suopajärvi, P, Richmond, C & Manninen, A 2016, Compact, Real-time Analyser for C-13 and O-18 Isotope Ratios of Carbon Dioxide in Breath Air . in OSA Technical Digest ., JT3A.16, Optical Society of America OSA, Imaging and Applied Optics, IS 2016, Heidelberg, Germany, 25/07/16 . https://doi.org/10.1364/3D.2016.JT3A.16

We present a compact and real-time analyser for δ 13C-CO2 and δ 18O-CO2 isotope ratios of CO2 in exhaled breath. The instrument exhibits major improvements compared to instrumentation currently available for isotope-selective diagnostics.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e2c5254ab7b2d624317abc9a02c59502
https://doi.org/10.1364/3d.2016.jt3a.16

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3DS-colorimeter based on a mobile phone camera for industrial applications

Autor: Jari Miettinen, J. Birgitta Martinkauppi, Pekka Suopajärvi

Publikováno v: Miettinen, J, Martinkauppi, B & Suopajärvi, P 2013, 3DS-colorimeter based on a mobile phone camera for industrial applications . in R Widenhorn & A Dupret (eds), Sensors, Cameras, and Systems for Industrial and Scientific Applications XIV ., 86590M, International Society for Optics and Photonics SPIE, Proceedings of SPIE, vol. 8659, Sensors, Cameras, and Systems for Industrial and Scientific Applications XIV, Burlingame, CA, United States, 3/02/13 . https://doi.org/10.1117/12.2004036

Colour gives an essential finishing touch to many products. Consumers find it as an important factor, for example, when selecting doors, furniture, parquet and coated metal products. Currently, colour evaluation is often carried out by looking at the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5b1b9ba598eb77d969fe2a7fff6be5ee
https://cris.vtt.fi/en/publications/19fb5a81-f740-479e-94af-24e131bddcca

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Low-noise moisture meter with high speed LED techniques

Autor: Markku Mäntylä, Pekka Suopajärvi, Jouko Malinen, Rami Aikio, Hannu Lindström

Publikováno v: Aikio, R, Lindström, H, Suopajärvi, P, Malinen, J & Mäntylä, M 2010, Low-noise moisture meter with high speed LED techniques . in Proceedings of SPIE : Next-Generation Spectroscopic Technologies III ., 768008, International Society for Optics and Photonics SPIE, Proceedings of SPIE, vol. 7680, SPIE Defense, Security and Sensing 2010, Orlando, Florida, United States, 5/04/10 . https://doi.org/10.1117/12.850010

Near infrared (NIR) spectroscopy can provide inexpensive, rapid and contact-free chemical content measurements for on-line, hand-held and laboratory applications. Traditionally multiwavelength NIR analyzers are based on incandescent lamp light source

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::63768d5caa7e0d59627cbc0bc1b504ea
https://cris.vtt.fi/en/publications/299eb89f-ad9c-4877-a771-c373f3746b60

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Digital spatial wavelength domain multiplexing (DSWDM) using a prism-grating-prism (PGP) and a CMOS imager: implementation and initial testing

Autor: Harri Kopola, John B. Niemczuk, Steven G. Buckley, Pekka Suopajärvi, Jason S. Kiddy, Steve Chen, Christopher S. Baldwin, Martin B. Christiansen, Mauri Aikio, Peter C. Chen

Publikováno v: SPIE Proceedings.

A CMOS imager-based spectrometer is used to interrogate a network containing a large number of Bragg grating sensors on multiple fibers as part of a proprietary structural health monitoring system. The spectrometer uses a Prism-Grating-Prism (PGP) to

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::27fec3223cebc71a0894ce1063700d45
https://doi.org/10.1117/12.435513

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High speed interrogation of large scale fiber optic Bragg grating arrays

Autor: Chen Shiping, Harri Kopola, Mauri Aikio, Peter C. Chen, Kartik Vaithyanathan, Martin B. Christiansen, Pekka Suopajärvi

Publikováno v: Christiansen, M, Vaithyanathan, K, Chen, P, Kopola, H, Aikio, M, Suopajärvi, P & Shiping, C 2000, ' High speed interrogation of large scale fiber optic Bragg grating arrays ', Paper presented at 14th International Conference on Optical Fiber Sensors, OFS2000, Venice, Italy, 11/10/00-13/10/00 pp. 256-259 .

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::707deab3eab529667e5cc3ab8dd55806
https://cris.vtt.fi/en/publications/fa0d994c-350f-4efb-93bb-e9c890b9a4f3

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A fibre-optic time-of-flight laser radar for measuring integral strain in a composite structure

Autor: Risto Myllylä, Pekka Suopajärvi, Mika Jurvakainen, Veijo Lyöri, Harri Kopola, Mikko Heikkinen, Antti Pramila, Kari Määttä, Hannu Lahtinen, P. Peltomaki

Publikováno v: Lyöri, V, Määttä, K, Myllylä, R, Jurvakainen, M, Lahtinen, H, Peltomäki, P, Pramila, A, Heikkinen, M, Suopajärvi, P & Kopola, H 2000, ' A fibre-optic time-of-flight laser radar for measuring integral strain in a composite structure ', Paper presented at 14th International Conference on Optical Fiber Sensors, OFS2000, Venice, Italy, 11/10/00-13/10/00 pp. 210-213 . https://doi.org/10.1117/12.2302212

A measurement system based on a sophisticated time-of-flight technique and a single mode optical fibre with internal reflectors has been developed for measuring integral strain inside a composite structure. The strain andspatial resolutions are 0.1 m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fc146faa88911e5dcca9ef4298f2d235
https://cris.vtt.fi/en/publications/0b69df30-b6ad-4614-ac29-75e53e193147

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Utilisation of optical fibre measurement techniques in determination of residual stresses of composites

Autor: Harri Tabell, Hannu Lahtinen, Risto Myllylä, Mikko Heikkinen, Maja Kucevic, Osmo Hormi, Antti Pramila, Mika Jurvakainen, Pekka Suopajärvi, Harri Kopola, Veijo Lyöri

Publikováno v: Lahtinen, H, Jurvakainen, M, Pramila, A, Tabell, H, Kucevic, M, Hormi, O, Lyöri, V, Heikkinen, M, Myllylä, R, Suopajärvi, P & Kopola, H 1999, Utilisation of optical fibre measurement techniques in determination of residual stresses of composites . in 13th International Conference on Optical Fiber Sensors : OFS-13 . International Society for Optics and Photonics SPIE, Proceedings of the Society of Photo-optical Instrumentation Engineers, vol. 3746, pp. 526-529, 13th International Conference on Optical Fiber Sensors, Kyongju, Korea, Republic of, 12/04/99 . https://doi.org/10.1117/12.2302063

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dba9c87b478fbee7074257b912abf8ec
https://cris.vtt.fi/en/publications/5052821e-dfc0-4d87-8a12-092ff19e63fd

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Experiences from Embedded Optical Fiber Based Cure and Stress Sensing in Composite Structures

Autor: Pekka Suopajärvi, Harri Kopola, Veijo Lyöri, Seppo Nissilä, Reijo Johansson

Publikováno v: Kopola, H, Suopajärvi, P, Lyöri, V, Nissilä, S & Johansson, R 1996, Experiences from Embedded Optical Fiber Based Cure and Stress Sensing in Composite Structures . in Applications of Photonic Technology 2 . Springer, pp. 783-788 . https://doi.org/10.1007/978-1-4757-9250-8_118
Applications of Photonic Technology 2 ISBN: 9781475792522

We report here on experiencies with optical fiber embedding and cure monitoring in a composite container manufacturing process, and with external stress measurements. Microbending loss in long single-mode and multi-mode telecommunication fibers was i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a122b032f0d3c93bfd96b14a219017be
https://cris.vtt.fi/en/publications/37cbcd06-9e3e-478c-ae4b-ae50b4c96508

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Indicating cure and stress in composite containers using optical fibers

Autor: Reijo Johansson, Harri Kopola, Seppo Nissilä, Veijo Lyöri, Pekka Suopajärvi

Publikováno v: Suopajärvi, P, Lyöri, V, Nissilä, S, Kopola, H & Johansson, R 1995, ' Indicating cure and stress in composite containers using optical fibers ', Optical Engineering, vol. 34, no. 9, pp. 2587-2591 . https://doi.org/10.1117/12.208131

Long optical fibers embedded inside a composite material enable on-line monitoring of the manufacturing process and can also be used to assess damage by monitoring strain and cracks in the structure. We report on measurements of the microbending loss

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::03047d158aadcd487825d123b9ae4625
https://cris.vtt.fi/en/publications/c5f6f2c2-2161-4eb0-b590-9fd82d637191

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