Nokia Corporation

Helsingin Yliopisto

Photono Oy

Nanoform Finland Oyj

Åbo Akademi Åbo Akademi University

Ivan Kassamakov

Niklas Sandler

Anton Nolvi

Tapani Viitala

Johan Nyman

Edward Haeggström

Ari Salmi

Heikki Juhani Nieminen

Antti Kontiola

Marcus Schorpp

Timo Rauhala

Edward Hæggström

Kalle Hanhijärvi

Tuomo Ylitalo

Pasi Vihinen

An artifact for determining resolution of imaging based on electromagnetic radiation, mechanical waves, or both is presented. The artifact includes a substrate and layers on top of the substrate. The layers include organic material and are stacked on each other in a partially overlapping way so that an edge of a first one of the layers is arranged to intersect with an edge of a second one of the layers. The layers constitute a three-dimensional surface topography where a groove defined by the edges of the first and second ones of the layers is tapering towards a point of intersection between the edges. The resolution is a minimum width of the tapering groove which is revealed by the imaging so that a pre-determined criterion is fulfilled.

Artifact for determining resolution of imaging based on electromagnetic radiation and/or mechanical waves

An intraocular pressure measurement arrangement is disclosed for measuring pressure of an eye of a patient. The arrangement can detect at least one of acoustic reflectivity, optical reflectivity, optical path difference, positioning of intraocular pressure measurement arrangement with respect to the eye, orientation of intraocular pressure measurement arrangement with respect to the eye, shape of cornea and corneal thickness. At least one source can produce acoustic, nonlinear acoustic, mechanical or a nonlinear mechanical wave from a distance, coupling to the eye to generate at least one surface wave. Upon triggering data acquisition, at least one surface wave from a distance from the eye can be detected to extract surface wave information with pressure information of the eye being based on the surface wave information.

Method and arrangement for eye measurements

A method for calibrating electromagnetic radiation-based three-dimensional imaging includes: obtaining () a calibration imaging result at least partly on the basis of electromagnetic waves received from a calibration artifact, forming () calibration data on the basis of the calibration imaging result and a known thickness profile of the calibration artifact, and correcting (), with the aid of the calibration data, an imaging result obtained at least partly on the basis of electromagnetic waves received from a sample to be imaged. The calibration artifact includes layers, for example Langmuir-Blodgett films, having pre-determined thicknesses and stacked on each other so as to achieve the pre-determined thickness profile of the calibration artifact. A three-dimensional imaging system configured to carry out the method.

Method for calibrating 3D imaging and system for 3D imaging

A hinge position sensor comprises first and second members connected together to provide a hinge, and an optical fiber or wave-guide connected between the first and second members to provide a communication link between the first and second members. A laser or LED is coupled to the optical fiber or wave-guide to transmit optical signals between the first and second members and the optical signal is received by a photo-detector. The optical fiber or wave-guide is physically distorted by actuation of the hinge such that light escapes from the optical fiber or wave-guide. The optical power level received by the photo-detector is used to determine the position of the hinge.

Position sensor

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Helsinki, Finland

Ivan Kassamakov