Výsledky vyhledávání - "Christer Holmlund"

Akademický článek

Implementation of a Controller for a Space-Grade, Piezo-Actuated Fabry-Perot Interferometer

Publikováno v: IEEE Access, Vol 10, Pp 83664-83677 (2022)

A tunable Fabry-Perot interferometer (FPI) can be used as an optical band-pass filter. This type of filter is used in spectrometers and spectral imagers. The transmitted wavelength depends on the optical cavity adjusted by an electronic controller. T

Externí odkaz: https://doaj.org/article/236f726f7b024eee8bc7e538cac18dfc

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Performance of MOEMS FPI based cubic-inch hyperspectral camera

Autor: Roberts Trops, Antti Näsilä, Christer Holmlund, Hans Toivanen, Rami Mannila, Ingmar Stuns, Endija Briede, Kai Viherkanto, Martti Blomberg, Heikki Saari

Publikováno v: Trops, R, Näsila, A, Holmlund, C, Toivanen, H, Mannila, R, Stuns, I, Briede, E, Viherkanto, K, Blomberg, M & Saari, H 2022, Performance of MOEMS FPI based cubic-inch hyperspectral camera . in H Zappe, W Piyawattanametha, W Piyawattanametha & Y-H Park (eds), MOEMS and Miniaturized Systems XXI ., 1201302, International Society for Optics and Photonics SPIE, Proceedings of SPIE-The International Society for Optical Engineering, vol. 12013, MOEMS and Miniaturized Systems XXI 2022, Virtual, Online, 20/02/22 . https://doi.org/10.1117/12.2609426

The MOEMS Fabry-Perot interferometer (MFPI) based hyperspectral cameras have the advantage of being low-cost and highly compact, but the performance characteristics determine if particular device can be used in given application. This paper describes

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8edec1fd37aa48113b5f032654150a79
https://doi.org/10.1117/12.2609426

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Control Electronics for High Wavelength Accuracy in a Nanosatellite Hyperspectral Imager

Autor: Christer Holmlund, Antti Näsilä, Jussi Mäkynen

Publikováno v: Holmlund, C, Näsilä, A & Mäkynen, J 2020, ' Control Electronics for High Wavelength Accuracy in a Nanosatellite Hyperspectral Imager ', Journal of Small Satellites, vol. 9, no. 2, pp. 911-920 . < https://jossonline.com/letters/control-electronics-for-high-wavelength-accuracy-in-a-nanosatellite-hyperspectral-imager/ >
VTT Technical Research Centre of Finland-PURE

Nanosatellite-compatible miniaturized hyperspectral imagers must achieve excellent wavelength accuracy in order to provide data suitable for use in scientific missions. This paper presents the gap control of the Fabry-Perot interferometer (FPI) used

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::6c9f6255fb608f1d570464d11c380de3
https://cris.vtt.fi/en/publications/7c9a919e-1821-4d8e-8431-704e8711143a

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Cubic-inch MOEMS spectral imager

Autor: Rami Mannila, Christer Holmlund, Heikki Saari, Ingmar Stuns, Kai Viherkanto, Roberts Trops, Bin Guo, Kari Rainio, Martti Blomberg, Endija Briede, Antti Näsilä, Anna Rissanen

Publikováno v: Näsilä, A, Holmlund, C, Briede, E, Mannila, R, Trops, R, Blomberg, M, Stuns, I, Guo, B, Viherkanto, K, Rainio, K, Saari, H & Rissanen, A 2019, Cubic-inch MOEMS spectral imager . in W Piyawattanametha, Y-H Park & H Zappe (eds), MOEMS and Miniaturized Systems XVIII ., 109310F, International Society for Optics and Photonics SPIE, Proceedings of SPIE, vol. 10931, MOEMS and Miniaturized Systems XVIII 2019, San Francisco, California, United States, 2/02/19 . https://doi.org/10.1117/12.2508420

Recently developed tunable MEMS Fabry- Perot interferometers based on Ag thin-film mirrors[1] have enabled building highly miniaturized spectral imagers covering almost the complete VNIR wavelength range. The level of miniaturization required by mode

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9f60315f73c210d6361aff88b1789aae
https://cris.vtt.fi/en/publications/2e22fcfe-943f-46af-a99c-cdbf6d594ebf

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Remote Sensing of 3-D Geometry and Surface Moisture of a Peat Production Area Using Hyperspectral Frame Cameras in Visible to Short-Wave Infrared Spectral Ranges Onboard a Small Unmanned Airborne Vehicle (UAV)

Autor: Rami Mannila, Christer Holmlund, Harri Ojanen, Eija Honkavaara, Heikki Saari, Niko Viljanen, Merja Pulkkanen, Tomi Rosnell, Matti A. Eskelinen, Teemu Hakala, Paula Litkey, Ilkka Pölönen

Publikováno v: Honkavaara, E, Eskelinen, M A, Pölönen, I, Saari, H, Ojanen, H, Mannila, R, Holmlund, C, Hakala, T, Litkey, P, Rosnell, T, Viljanen, N & Pulkkanen, M 2016, ' Remote sensing of 3-D geometry and surface moisture of a peat production area using hyperspectral frame cameras in visible to short-wave infrared spectral ranges onboard a small Unmanned Airborne Vehicle (UAV) ', IEEE Transactions on Geoscience and Remote Sensing, vol. 54, no. 9, pp. 5440-5454 . https://doi.org/10.1109/TGRS.2016.2565471

Miniaturized hyperspectral imaging sensors are becoming available to small unmanned airborne vehicle (UAV) platforms. Imaging concepts based on frame format offer an attractive alternative to conventional hyperspectral pushbroom scanners because they

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::db68835d58c696243b239db37fca7e69
https://doi.org/10.1109/tgrs.2016.2565471

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VISIBLE, VERY NEAR IR AND SHORT WAVE IR HYPERSPECTRAL DRONE IMAGING SYSTEM FOR AGRICULTURE AND NATURAL WATER APPLICATIONS

Autor: Christer Holmlund, Heikki Saari, Oiva Niemeläinen, Harri Ojanen, Altti Akujärvi, Jere Kaivosoja, A. Nissinen

Publikováno v: The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XLII-3-W3, Pp 165-170 (2017)
Saari, H, Akujärvi, A, Holmlund, C, Ojanen, H, Kaivosoja, J, Nissinen, A & Niemeläinen, O 2017, Visible, very near IR and short wave IR hyperspectral drone imaging system for agriculture and natural water applicationS . in E Honkavaara, B Hu, K Karantzalos, X Liang, R Müller, E Nocerino, I Pölönen & P Rönnholm (eds), Frontiers in Spectral imaging and 3D Technologies for Geospatial Solutions . International Society for Photogrammetry and Remote Sensing ISPRS, International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, vol. XLII-3W3, pp. 165-170, Frontiers in Spectral imaging and 3D Technologies for Geospatial Solutions, ISPRS SPEC3D, Jyväskylä, Finland, 25/10/17 . https://doi.org/10.5194/isprs-archives-XLII-3-W3-165-2017

The accurate determination of the quality parameters of crops requires a spectral range from 400 nm to 2500 nm (Kawamura et al., 2010, Thenkabail et al., 2002). Presently the hyperspectral imaging systems that cover this wavelength range consist of s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0c01f22d0dd420686a0980adc6709b2b
https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLII-3-W3/165/2017/

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MEMS FPI-based smartphone hyperspectral imager

Autor: Kari Rainio, Ismo Näkki, Kai Viherkanto, Harri Ojanen, Anna Rissanen, Christer Holmlund, Heikki Saari, Ingmar Stuns

Publikováno v: Rissanen, A, Saari, H, Rainio, K, Stuns, I, Viherkanto, K, Holmlund, C, Näkki, I & Ojanen, H 2016, MEMS FPI-based smartphone hyperspectral imager . in M A Druy & R A Crocombe (eds), Next-Generation Spectroscopic Technologies IX ., 985507, International Society for Optics and Photonics SPIE, Proceedings of SPIE, vol. 9855, Next-Generation Spectroscopic Technologies IX, Baltimore, United States, 18/04/16 . https://doi.org/10.1117/12.2229575

This paper demonstrates a mobile phone-compatible hyperspectral imager based on a tunable MEMS Fabry-Perot interferometer. The realized iPhone 5s hyperspectral imager (HSI) demonstrator utilizes MEMS FPI tunable filter for visible-range, which consis

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7a806820108d842634aa491a3e964bd9
https://doi.org/10.1117/12.2229575

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Picasso VISION instrument design, engineering model test results, and flight model development status

Autor: Didier Pieroux, Altti Akujärvi, Ismo Näkki, Philippe Demoulin, Didier Fussen, Antti Näsilä, Harri Ojanen, Rami Mannila, Christer Holmlund, Heikki Saari

Publikováno v: Näsilä, A, Holmlund, C, Mannila, R, Näkki, I, Ojanen, H J, Akujärvi, A, Saari, H, Fussen, D, Pieroux, D & Demoulin, P 2016, Picasso VISION instrument design, engineering model test results, and flight model development status . in Proceedings of Remote Sensing of Clouds and the Atmosphere XXI . International Society for Optics and Photonics SPIE, Proceedings of SPIE, vol. 10001, Remote Sensing of Clouds and the Atmosphere XXI, Edinburgh, United Kingdom, 28/09/16 . https://doi.org/10.1117/12.2241956

PICASSO - A PICo-satellite for Atmospheric and Space Science Observations is an ESA project led by the Belgian Institute for Space Aeronomy, in collaboration with VTT Technical Research Centre of Finland Ltd, Clyde Space Ltd. (UK) and Centre Spatial

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3aa897ff52778b51b9a8a42e3f8b9b1f
https://cris.vtt.fi/en/publications/1be40e72-7cbd-4988-9c83-3d6b97e09775

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The Two Wide-angle Imaging Neutral-atom Spectrometers (TWINS) NASA Mission-of-Opportunity

Publikováno v: McComas, D J, Allegrini, F, Baldonado, J, Blake, B, Brandt, P C, Burch, J, Clemmons, J, Crain, W, Delapp, D, DeMajistre, R, Everett, D, Fahr, H, Friesen, L, Funsten, H, Goldstein, J, Gruntman, M, Harbaugh, R, Harper, R, Henkel, H, Holmlund, C, Lay, G, Mabry, D, Mitchell, D, Nass, U, Pollock, C, Pope, S, Reno, M, Ritzau, S, Roelof, E, Scime, E, Sivjee, M, Skoug, R, Sotirelis, T S, Thomsen, M, Urdiales, C, Valek, P, Viherkanto, K, Weidner, S, Ylikorpi, T, Young, M & Zoennchen, J 2009, ' The two wide-angle imaging neutral-atom spectrometers (TWINS) NASA mission-of-opportunity ', Space Science Reviews, vol. 142, no. 1-4, pp. 157-231 . https://doi.org/10.1007/s11214-008-9467-4

Two Wide-angle Imaging Neutral-atom Spectrometers (TWINS) is a NASA Explorer Mission-of-Opportunity to stereoscopically image the Earth’s magnetosphere for the first time. TWINS extends our understanding of magnetospheric structure and processes by

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e892ceb973f6fdabbc956d7da13e9227
https://doi.org/10.1007/s11214-008-9467-4

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Visible spectral imager for occultation and nightglow (VISION) for the PICASSO Mission

Autor: Didier Pieroux, Harri Ojanen, Didier Fussen, Emmanuel Dekemper, Heikki Saari, Rami Mannila, Christer Holmlund, Ismo Näkki, Philippe Demoulin, Filip Vanhellemont, Antti Näsilä

Publikováno v: Saari, H, Näsilä, A, Holmlund, C, Mannila, R, Näkki, I, Ojanen, H J, Fussen, D, Pieroux, D, Demoulin, P, Dekemper, E & Vanhellemont, F 2015, Visible spectral imager for occultation and nightglow (VISION) for the PICASSO Mission . in R Meynard (ed.), Sensors, Systems, and Next-Generation Satellites XIX . International Society for Optics and Photonics SPIE, Bellingham, Proceedings of SPIE, vol. 9639, Sensors, Systems, and Next-Generation Satellites XIX, Toulouse, France, 21/09/15 . https://doi.org/10.1117/12.2193557

PICASSO - A PICo-satellite for Atmospheric and Space Science Observations is an ESA project led by the Belgian Institute for Space Aeronomy, in collaboration with VTT, Clyde Space Ltd. (UK), and the Centre Spatial de Liege (BE). VTT Technical Researc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e4edda8bb007a0939f9d5e0742e151cd
https://cris.vtt.fi/en/publications/42e4485c-4d4e-4590-b18d-e9f5607d6362

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