Zobrazeno 1 - 10
of 429
pro vyhledávání: '"Juha Kostamovaara"'
Publikováno v:
IEEE Photonics Journal, Vol 16, Iss 2, Pp 1-7 (2024)
A solid-state three-dimensional (3-D) range imager using the pulsed time-of-flight principle and a single photon avalanche diode (SPAD) based receiver is demonstrated. Contrary to conventional flood illumination, the suggested system uses sequentiall
Externí odkaz:
https://doaj.org/article/cb891b64adc04fa58de1680bc8424ee7
Autor:
Juha Kostamovaara, Sahba Jahromi, Lauri Hallman, Guoyong Duan, Jussi-Pekka Jansson, Pekka Keranen
Publikováno v:
IEEE Photonics Journal, Vol 14, Iss 2, Pp 1-11 (2022)
Full realization of a solid-state 3-D range imager based on the pulsed time-of-flight method is presented. The system uses block-based segmented illumination in the transmitter realized with a 16-element common anode laser diode bar. The receiver is
Externí odkaz:
https://doaj.org/article/7db222db7816471191b5186a80b2b386
On Two-Dimensional Rangefinding Using a ∼1 nJ/∼100 ps Laser Diode Transmitter and a CMOS SPAD Matrix
Publikováno v:
IEEE Photonics Journal, Vol 10, Iss 4, Pp 1-12 (2018)
A potentially compact 2-D range profiler for noncooperative targets with a distance range of >10 m is demonstrated. A laser diode utilizing enhanced gain switching is used as a transmitter to provide short, high-energy optical pulses (~1 nJ/140 ps).
Externí odkaz:
https://doaj.org/article/b827d723b91a49149c14bf6caff47a16
Publikováno v:
Sensors, Vol 20, Iss 21, p 5973 (2020)
The relation between signal and background noise strengths in single-photon avalanche diode (SPAD)-based pulsed time-of-flight 3-D range imaging is analyzed on the assumption that the SPAD detector is operating in the single photon detection mode. Se
Externí odkaz:
https://doaj.org/article/d6fe140cf6b5436d9d339b335a1f39c5
Autor:
Juha Kostamovaara, Jaakko Huikari, Lauri Hallman, Ilkka Nissinen, Jan Nissinen, Harri Rapakko, Eugene Avrutin, Boris Ryvkin
Publikováno v:
IEEE Photonics Journal, Vol 7, Iss 2, Pp 1-15 (2015)
This paper discusses the construction principles and performance of a pulsed time-of-flight (TOF) laser radar based on high-speed (FWHM ~100 ps) and high-energy (~1 nJ) optical transmitter pulses produced with a specific laser diode working in an “
Externí odkaz:
https://doaj.org/article/cd6f89e502fa4b779b347fa418b5a20b
Publikováno v:
Sensors, Vol 18, Iss 10, p 3200 (2018)
Remote Raman spectroscopy is widely used to detect minerals, explosives and air pollution, for example. One of its main problems, however, is background radiation that is caused by ambient light and sample fluorescence. We present here, to the best o
Externí odkaz:
https://doaj.org/article/270b110a39254e0585c6b261355a6242
Impact ionization, avalanche and breakdown phenomena form the basis of many very interesting and important semiconductor devices, such as avalanche photodiodes, avalanche transistors, suppressors, sharpening diodes (diodes with delayed breakdown), as
Autor:
Ilpo Niskanen, Matti Immonen, Lauri Hallman, Martti Mikkonen, Visa Hokkanen, Takeshi Hashimoto, Juha Kostamovaara, Rauno Heikkilä
Publikováno v:
Journal of Transportation Engineering, Part B: Pavements. 149
Construction materials and related management, handling, and storage provisions account for a large portion of road construction expenses. For that reason, improved material flow monitoring techniques can achieve significant cost and time savings, as
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::32ff0f1b7ae8aa007ada19f2571f5af7
https://doi.org/10.1061/jpeodx.pveng-1149
https://doi.org/10.1061/jpeodx.pveng-1149
Autor:
Ilpo Niskanen, Matti Immonen, Tomi Makkonen, Lauri Hallman, Martti Mikkonen, Pekka Keränen, Juha Kostamovaara, Rauno Heikkilä
Publikováno v:
Journal of Visualization.
Abstract Real-time, three-dimensional (3D) visualisation technology can be used at construction sites to improve the quality of work. A 3D view of the landscape under work can be compared to a target 3D model of the landscape to conveniently show nee
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::417dfb60c4e0d5c8b845de448718066f
https://doi.org/10.1007/s12650-023-00908-4
https://doi.org/10.1007/s12650-023-00908-4
Autor:
Ilpo Niskanen, Lauri Hallman, Pekka Keranen, Juha Kostamovaara, Rauno Heikkilä, Mikko Hiltunen, Matti Immonen
Publikováno v:
IEEE Sensors Journal. 21:17200-17206
The research aimed to integrate a solid-state 2D-pulsed time-of-flight (TOF) flash Lidar profilometer and a mechanically scanning 3D Lidar in order to monitor the 4D (3D + signal intensity) environment at a construction site from an excavator. Utiliz
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4862720f903970636ec6dbdf8c7732cd
https://doi.org/10.1109/jsen.2021.3078301
https://doi.org/10.1109/jsen.2021.3078301