Valtion Teknillinen Tutkimuskeskus

Teknologian Tutkimuskeskus Vtt

Upm-kymmene Corporation

Valmet Automation

Oras Oy

Stresstech Oy

Vitalsignum Oy

Timo Varpula

Heikki Seppä

Kaj Nummila

Ville Viikari

Kaarle Jaakkola

Tomi Juha Mattila

Mark Allen

Ari Alastalo

Panu Helistö

Juha-Matti Saari

Pentti Lajunen

Janne-Yrjo Antola

Arto Sakari Sunila

Panu HelistÖ

A mobile device for measuring at least one electrical biosignal. The device comprises a first input and a second input, a measuring circuit part for providing an output signal indicating the electrical biosignal to be measured, the measuring circuit part comprising a first input and a second input, and a charging circuit part for charging a rechargeable battery inserted in the device, the charging circuit part comprising a first input and a second input. The first input of the measuring circuit part and the first input of the charging circuit part are connected to the first input of the mobile device and the second input of the measuring circuit part and the second input of the charging circuit part are connected to the second input of the mobile device.

Mobile device for measuring electrical biosignals

Described herein is a passive wireless resonating non-linear sensor that is typically based on a ferroelectric varactor. The sensor replies its data at an intermodulation frequency when a reader device illuminates it at two closely-located frequencies. Furthermore, described herein is a general intermodulation read-out principle for passive wireless sensors. A sensor utilizes a mixing element, such as a varactor and it can be equipped with a capacitive, inductive, or resistive sensor element. When the sensor is illuminated with signals with two frequencies it replies the sensor data at an intermodulation frequency.

Non-linear resonating sensor and a method

This document describes a method and system for object localization. In accordance with the method an object () is illuminated by at least one first type of signal, and response of the signal is detected. In accordance with the invention the object () equipped with a transponder () backscattering the first type of signal, the transponder () is illuminated also by a second type of signal affecting to the backscattering frequency of the transponder (), and the backscattered signal from the transponder () is detected in order to localize the object.

Method and system for object localization

The invention relates to a measuring system for detecting radio-frequency tags, a measuring method, and a new use for a leaky waveguide. The measuring system comprises a reading device and an antenna, which is connected to reading device for connecting to the tags. According to the invention, the antenna is a microstrip-type leaky waveguide having a length which is several times the operating wavelength of the tags. The invention permits reliable and precise RFID detection, for example, for a results service for sports events.

Measurement system, measurement method and new use of antenna

The present invention relates to a power feeding arrangement for electric loads (R) positioned in tires () of vehicles. According to the invention the arrangement comprises at least one feed coil (L) arranged in the vehicle (), at least one receiver coil (L) arranged in the tire (), and at least one load (R) electrically coupled to the receiver coil (L).

Coil system and voltage rectifiers for communication and inductive powering of devices inside rotating tyre of a vehicle

A sensor arrangement for a sensor arrangement remotely readable by radio frequencies. The sensor arrangement includes an LC resonator that includes a capacitor and a coil, and a sensor element coupled to the LC resonator whose properties change as a function of a measurable quantity. A sensor element according to the invention does not form a direct galvanic contact with the LC resonator, rather the coupling is implemented capacitively or inductively.

Radiofrequency based sensor arrangement and a method

This publication discloses a method and arrangement for determining the hardening depth of steel or other ferromagnetic substances without breaking the object being measured. According to the invention, a varying magnetic field, which causes magnetic Barkhausen noise (MBN), is created in the measurement object with the aid of a magnetization coil. The varying magnetic field is regulated in such a way that the maximum force of the magnetic field does not exceed the coercitive force of the unhardened part of the measurement object. The MBN caused is measured with the aid of an MBN sensor. The measured signal is filtered and Fourier transformed. The signal in the frequency range is integrated over a suitable frequency band, in order to determine the value depicting the energy of the MBN. This value correlates with the hardening depth and on the basis of this value it is thus possible to determine the hardening depth.

Method for determining the hardening depth of steel

Method and apparatus for determination of fiber orientation in paper or

The invention relates to a method and arrangement for measuring using magnetic flow measurement, the flow velocity of a liquid, particularly water. In the solution according to the invention, a component that is in the same phase with the magnetic field is measured from the sinusoidal voltage induced in the electrodes. The solution according to the invention can be utilized, for example, in measuring the flow velocity of water flowing in a water pipeline.

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Vantaa, Finland

Timo Varpula