Dr. Kari J. Kataja Profile

Dr. Kari J. Kataja

Research Scientist at Specim Spectral Imaging Ltd

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Author

Publications (18)

Proceedings Article | 17 June 2024 Presentation + Paper

Validating spatial resolution measurement techniques in pushbroom hyperspectral cameras according to upcoming IEEE P4001 standard

Mariia Borovkova, Kari Kataja, Hannu Holma

Proceedings Volume 13024, 1302406 (2024) https://doi.org/10.1117/12.3015804

KEYWORDS: Cameras, Spatial resolution, Standards development, Sensors, Spectrographs, Signal detection, Spectral imaging cameras, Point spread functions

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Proceedings Article | 14 May 2018 Presentation

A truly mobile push-broom hyperspectral camera (Conference Presentation)

Jouni Jussila, Kari Kataja, Jarkko Puusaari, Harri Salo

Proceedings Volume 10657, 106570S (2018) https://doi.org/10.1117/12.2304750

KEYWORDS: Cameras, Data processing, Human-machine interfaces, Spectroscopy, Optical filters, Signal to noise ratio, Image acquisition, Computer programming, Agriculture, Safety

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Proceedings Article | 25 April 2008 Paper

Passive THz imaging system for stand-off identification of concealed objects: results from a turn-key 16 pixel imager

A. Luukanen, L. Grönberg, T. Haarnoja, P. Helistö, K. Kataja, M. Leivo, A. Rautiainen, J. Penttilä, J. Bjarnason, C. Dietlein, M. Ramirez, E. Grossman

Proceedings Volume 6948, 69480O (2008) https://doi.org/10.1117/12.784922

KEYWORDS: Sensors, Imaging systems, Terahertz radiation, Bolometers, Signal to noise ratio, Electronics, Cryogenics, Target detection, Temperature metrology, Niobium

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Proceedings Article | 21 April 2006 Paper

Parallel optical interconnect between surface-mounted devices on FR4 printed wiring board using embedded waveguides and passive optical alignments

Mikko Karppinen, Teemu Alajoki, Antti Tanskanen, Kari Kataja, Jukka-Tapani Mäkinen, Pentti Karioja, Marika Immonen, Jorma Kivilahti

Proceedings Volume 6185, 61850O (2006) https://doi.org/10.1117/12.664386

KEYWORDS: Waveguides, Tolerancing, Microlens array, Optical alignment, Micromirrors, Receivers, Vertical cavity surface emitting lasers, Optical interconnects, Monte Carlo methods, Transmitters

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Proceedings Article | 9 September 2004 Paper

On surface plasmon enhanced near-field transducers

Juuso Olkkonen, Kari Kataja, Janne Aikio, Dennis Howe

Proceedings Volume 5380, (2004) https://doi.org/10.1117/12.556798

KEYWORDS: Metals, Silver, Transducers, Thin films, Near field, Radio propagation, Interfaces, Dielectrics, Prisms, Surface plasmons

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Proceedings Article | 9 September 2004 Paper

Readout signal simulation as a function of the readout power of the super resolution optical disk

Kari Kataja, Takashi Nakano, Janne Aikio, Junji Tominaga

Proceedings Volume 5380, (2004) https://doi.org/10.1117/12.556776

KEYWORDS: Silver, Modulation, Sensors, Particles, Finite-difference time-domain method, Super resolution, Optical discs, Crystals, Signal to noise ratio, Reflectivity

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Proceedings Article | 9 September 2004 Paper

Analysis of sub-wavelength apertures via the extended FDTD SF technique

Juuso Olkkonen, Kari Kataja, Janne Aikio, Dennis Howe, Tom Milster

Proceedings Volume 5380, (2004) https://doi.org/10.1117/12.556806

KEYWORDS: Finite-difference time-domain method, Silver, Thin films, Metals, Interfaces, Refractive index, Magnetism, Surface plasmons, Dielectrics, Wave propagation

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Proceedings Article | 8 September 2004 Paper

Embedded optical interconnect on printed wiring board

Mikko Karppinen, Jukka-Tapani Makinen, Kari Kataja, Antti Tanskanen, Teemu Alajoki, Pentti Karioja, Marika Immonen, Jorma Kivilahti

Proceedings Volume 5453, (2004) https://doi.org/10.1117/12.545931

KEYWORDS: Waveguides, Tolerancing, Vertical cavity surface emitting lasers, Monte Carlo methods, Transmitters, Receivers, Microlens array, Lenses, Polymers, Optical alignment

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Proceedings Article | 10 June 2004 Paper

Optical interconnect on printed wiring board

Mikko Karppinen, Jukka-Tapani Makinen, Kari Kataja, Antti Tanskanen, Teemu Alajoki, Pentti Karioja, Marika Immonen, Jorma Kivilahti

Proceedings Volume 5358, (2004) https://doi.org/10.1117/12.530350

KEYWORDS: Waveguides, Tolerancing, Monte Carlo methods, Transmitters, Vertical cavity surface emitting lasers, Receivers, Lenses, Sensors, Optical interconnects, Optical alignment

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Proceedings Article | 18 February 2004 Paper

Imaging lens design using image quality metric

Jean-Luc Olives, Timo Kolehmainen, Janne Aikio, Kari Kataja, Pentti Karioja, Tero Vuori, T. Mustonen

Proceedings Volume 5249, (2004) https://doi.org/10.1117/12.512817

KEYWORDS: Image quality, Imaging systems, Modulation transfer functions, Lens design, Image sensors, LCDs, Visualization, Sensors, Signal to noise ratio, Objectives

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Proceedings Article | 22 January 2004 Paper

Simulation of imaging system's performance

Timo Kolehmainen, Janne Aikio, Mikko Karppinen, Antti-Jussi Mattila, Jukka-Tapani Makinen, Kari Kataja, Kari Tukkiniemi, Pentti Karioja

Proceedings Volume 5178, (2004) https://doi.org/10.1117/12.504330

KEYWORDS: Imaging systems, Image sensors, Sensors, Image quality, RGB color model, Lens design, Modulation transfer functions, Point spread functions, Visualization, Raster graphics

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SPIE Journal Paper | 1 December 2002

Fabrication and characterization of hybrid-glass-based axicons

Terho Kololuoma, Kari Kataja, Sanna Aikio, Janne Aikio, Juha Rantala

OE, Vol. 41, Issue 12, (December 2002) https://doi.org/10.1117/12.10.1117/1.1518993

KEYWORDS: Axicons, Ultraviolet radiation, Optical components, Diffraction, Chemical elements, Diffraction gratings, Sol-gels, Collimation, Optical testing, Binary data

Proceedings Article | 18 June 2002 Paper

Extremely short external cavity lasers: the use of wavelength tuning effects in near field sensing

Janne Aikio, Kari Kataja, Teemu Alajoki, Pentti Karioja, Dennis Howe

Proceedings Volume 4640, (2002) https://doi.org/10.1117/12.433253

KEYWORDS: Wavelength tuning, Reflectivity, Mirrors, Semiconductor lasers, Near field, Sensors, Tunable lasers, Laser optics, Laser resonators, Optical discs

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Proceedings Article | 10 June 2002 Paper

Two-dimensional FDTD modeling of direct semiconductor laser read/write systems

Janne Aikio, Kari Kataja, Juuso Olkkonen, Dennis Howe

Proceedings Volume 4647, (2002) https://doi.org/10.1117/12.469827

KEYWORDS: Reflectivity, Finite-difference time-domain method, Semiconductor lasers, Absorption, Systems modeling, Data modeling, Waveguides, Laser systems engineering, Laser resonators, Laser optics

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Proceedings Article | 10 June 2002 Paper

Morphological and optical characterization of hybrid-glass-based axicons

Terho Kololuoma, Kari Kataja, Sanna Aikio, Janne Aikio, Juha Rantala

Proceedings Volume 4647, (2002) https://doi.org/10.1117/12.469820

KEYWORDS: Axicons, Optical components, Sol-gels, Diffraction, Chemical elements, Binary data, Semiconductor lasers, Optical design, Collimation, Hybrid optics

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SPIE Journal Paper | 1 April 2002

Wireless infrared data links: ray-trace simulations of diffuse channelsand demonstration of diffractive element for multi-beam transmitters

Mikko Karppinen, Kari Kataja, Jukka-Tapani Maekinen, Sanna Aikio, Hannu Rajaniemi, Pertti Paeaekkoenen, Jari Turunen, Juha Rantala, Pentti Karioja

OE, Vol. 41, Issue 04, (April 2002) https://doi.org/10.1117/12.10.1117/1.1456538

KEYWORDS: Transmitters, Sensors, Monte Carlo methods, Scattering, Receivers, Vertical cavity surface emitting lasers, Computer simulations, Diffraction, Ray tracing, Data modeling

Proceedings Article | 29 October 2001 Paper

Extremely short external-cavity lasers: direct semiconductor laser readout modeling by using finite difference time domain calculations

Janne Aikio, Kari Kataja, Dennis Howe

Proceedings Volume 4595, (2001) https://doi.org/10.1117/12.446606

KEYWORDS: Reflectivity, Absorption, Finite-difference time-domain method, Semiconductor lasers, Systems modeling, Waveguides, Optical simulations, Laser optics, Laser resonators, Data modeling

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Proceedings Article | 10 March 2000 Paper

Diffractive optical element in free-space data transmission systems

Kari Kataja, Pertti Paakkonen, Jari Turunen, Juha Rantala, Pentti Karioja

Proceedings Volume 3951, (2000) https://doi.org/10.1117/12.379355

KEYWORDS: Diffraction, Vertical cavity surface emitting lasers, Chemical elements, Diffractive optical elements, Transmitters, Beam shaping, Sensors, Data transmission, CCD cameras, Binary data

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Showing 5 of 18 publications

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