Matti Vaaja

Aalto University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Hannu Hyyppä

Aalto University

Juho‐Pekka Virtanen

Forum Virium (Finland)

Matti Kurkela

Aalto University

Juha Hyyppä

Finnish Geospatial Research Institute

Antero Kukko

Finnish Geospatial Research Institute

Harri Kaartinen

Finnish Geospatial Research Institute

Marika Ahlavuo

Aalto University

Arttu Julin

Aalto University

Petteri Alho

University of Turku

Antti V. Räisänen

Aalto University

Cooperative Institutions

Aalto University

109

University of Helsinki

Finnish Geospatial Research Institute

Maanmittauslaitos

University of Eastern Finland

VTT Technical Research Centre of Finland

University of Turku

Research Council of Finland

University of Technology

Geological Survey of Finland

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Design of transmission-type phase holograms for a compact radar-cross-section measurement range at 650 GHz

Applied Optics (2007)

Eero Noponen Aleksi Tamminen Matti Vaaja

A design formalism is presented for transmission-type phase holograms for use in a submillimeter-wave compact radar-cross-section (RCS) measurement range. The design method is based on rigorous electromagnetic grating theory combined with conventional hologram synthesis. Hologram structures consisting of a curved groove pattern on a 320 mm×280 mm Teflon plate are designed to transform an incoming spherical wave at 650 GHz into an output wave generating a 100 mm diameter planar field region (quiet zone) at a distance of 1 m. The reconstructed quiet-zone field is evaluated by a numerical simulation method. The uniformity of the quiet-zone field is further improved by reoptimizing the goal field. Measurement results are given for a test hologram fabricated on Teflon.

Diffraction efficiency

10.1364/ao.46.004181

Cite

Citations (4)

Compact Antenna Test Range Based on a Computer-Generated Hologram and Its Use at Submillimeter Wavelengths

Loughborough Antennas and Propagation Conference (2007)

Antti V. Räisänen Juha Ala‐Laurinaho Janne Häkli Aki Karttunen Tomi Koskinen

Compact antenna test range developed at TKK Helsinki University of Technology utilizes a computer-generated amplitude hologram as the collimating element. Recently we have demonstrated its applicability for testing high-gain antennas at 650 GHz.

Collimated light

Computer-Generated Holography

10.1109/lapc.2007.367425

Cite

Citations (1)

3D-kaupunkimallit ja virtuaalisuus aluekehityksen työkaluiksi

Juho‐Pekka Virtanen Kaisa Jaalama Arttu Julin Matti Kurkela Mikko Maksimainen

Source

Cite

Citations (0)

Virtuaalimallit tulevat kulttuuri- ja taidetapahtumien suunnitteluun: Voit jo etukäteen saada selville, miltä suosikkibändin keikka kuulostaa ja näyttää

Marika Ahlavuo Hannu Hyyppä Juho‐Pekka Virtanen Matti Vaaja Matti Kurkela

Milt

Source

Cite

Citations (0)

Microwave radiometer studies of snow on lake ice

M. Hallikainen Matti Vaaja Annakaisa von Lerber Kalle Nordling Juha Lemmetyinen

Microwave radiometer

Source

Cite

Citations (1)

Measurement of high-gain antennas at mm- and submm-wavelenghts: challenges and solutions

Antti V. Räisänen Juha Ala‐Laurinaho Janne Häkli Aki Karttunen Tomi Koskinen

Source

Cite

Citations (0)

APPROACHES FOR MAPPING NIGHT-TIME ROAD ENVIRONMENT LIGHTING CONDITIONS

ISPRS annals of the photogrammetry, remote sensing and spatial information sciences (2020)

Matti Vaaja Mikko Maksimainen Matti Kurkela Juho‐Pekka Virtanen Toni Rantanen

Abstract. The integration of the 3D measurement techniques with luminance imaging has increased the potential for mapping night-time road lighting conditions. In this study, we present selected static and mobile approaches for the purpose. The measurement methods include conventional 2D imaging luminance photometry and the integration of the luminance imaging with terrestrial and mobile laser scanning. In addition, we present our initial experiences with performing integrated luminance mapping and photogrammetric reconstruction from drone imagery. All of the presented methods require that the camera is calibrated with a reference luminance source. Our results show the results of luminance calibration and feasibility of 3D luminance point clouds for evaluating road surface luminances. In addition, we discuss the other potential applications, limitations and future research.

Road surface

10.5194/isprs-annals-v-1-2020-199-2020

Cite

Citations (4)

Hologram-based CATR measurement of a 1.5 m antenna at 650 GHz: progress report

Juha Ala‐Laurinaho Janne Häkli Aki Karttunen Tomi Koskinen Anne Lönnqvist

Source

Cite

Citations (1)

Applying photogrammetry to reconstruct 3D luminance point clouds of indoor environments

Architectural Engineering and Design Management (2020)

Matti Kurkela Mikko Maksimainen Arttu Julin Juho‐Pekka Virtanen Ilari Männistö

Computer-aided 3D modelling is the standard design method in the architecture, engineering, construction, owner, operator (AECOO) industry and in lighting design. Applying a photogrammetric process, a sequence of images is used to reconstruct the geometry of a space or an object in a 3D model. Likewise, a calibrated digital camera is utilized to measure the surface luminance values of an environment or an object. We propose a workflow in which the geometry and the luminance values are measured simultaneously by combining these two measurement methods. The pipeline has been assessed and validated through the application to a case study, the Aalto Hall (Aalto University, Espoo, Finland), in order to understand its potential.

10.1080/17452007.2020.1862041

Cite

Citations (11)

Reflection-type phase hologram for beam shaping: experimental results at 310 GHz

Aleksi Tamminen Aki Karttunen Matti Vaaja Eero Noponen Juha Ala‐Laurinaho

Reflection

Source

Cite

Citations (5)