Teknologian Tutkimuskeskus Vtt Oy

Valtion Teknillinen Tutkimuskeskus

Oxford Instruments Analytical Oy

Metorex International Oy

Asqella Oy

Teknologian Tutkimuskeskus Vtt

Arttu Luukanen

Panu Helistö

Heikki Seppä

Heikki J Sipila

Juha Hassel

Andrey Timofeev

Anssi Rautiainen

Aleksi Tamminen

Leif Grönberg

Mikko Leivo

Veli-Pekka Viitanen

Panu HelistÖ

Leif GRÖNBERG

An imaging apparatus that includes a scanning mirror arrangement, optics, and a detector arrangement comprising a plurality of detectors. The plurality of detectors are capable for detecting submillimeter-/millimeter-range electromagnetic radiation and arranged within a region defined by an outer periphery and an inner periphery of the detector arrangement. The outer and inner peripheries are substantially circular in shape.

Imaging apparatus for monitoring objects

To increase efficiency of optical control of phase shifting elements, arrangements comprising optical lenses are presented. The optical lenses may be arranged in reflective arrays so as to focus light from a light source on a phase shifting element, which may be placed in a feed point of an antenna, such as for example a lithographic antenna. In some embodiments, thus both optical controlling radiation and radio frequency, RF, power are concentrated in substantially the same place.

Optically controlled phase shifter

A superconducting thermal detector (bolometer) of THz (sub-millimeter) wave radiation based on sensing the change in the amplitude or phase of a resonator circuit, consisting of a capacitor (Csh) and a superconducting temperature dependent inductor where the said inductor is thermally isolated from the heat bath (chip substrate) by micro-suspensions. The bolometer design includes a thin film inductor located on the membrane, a single or/and multi-layered thin film capacitor, and a thin film absorber of incoming radiation. The bolometer design can also include a lithographic antenna with antenna termination and/or a back reflector beneath the membrane for optimal wavelength detection by the resonance circuit. The superconducting thermal detector (bolometer) and arrays of these detectors operate in a temperature range from 1 Kelvin to 10 Kelvin.

Superconducting thermal detector (bolometer) of terahertz (sub-millimeter wave) radiation

The invention relates to a bolometer element, a bolometer cell, a bolometer camera, and a method for reading a bolometer cell. The bolometer cell comprises several bolometer elements. Each bolometer element comprises a first bolometer having a first heating resistance for sensing radiation power acting on the element, and a second bolometer having a second heating resistance, and in each bolometer element the first and second bolometers are electrically connected to each other in such a way that the heating resistance () of the first bolometer can be biased with the aid of a voltage through the heating resistance of the second bolometer in order to amplify the radiation power detected with the aid of the connection. With the aid of the invention, it is possible to implement an extremely sensitive bolometer camera.

Bolometer element, bolometer cell, bolometer camera and method

An antenna-coupled microbolometer structure comprises a substrate (), an antenna () supported by the substrate, and a thermally sensitive element () connected to the antenna and arranged to dissipate electric currents induced into the antenna. Both the antenna () and the thermally sensitive element () comprise material that is susceptible to achieving a superconductive state below a certain critical temperature. The thermally sensitive element () is supported at a distance from the substrate () leaving an empty gap () between the thermally sensitive element () and a surface of the substrate ().

Superconducting antenna-coupled hot-spot microbolometer, methods for its manufacture and use, and a bolometric imaging arrangement

The invention relates to detection performed over millimeter and submillimeter wavelengths, especially to imaging solutions functioning over a submillimeter-wavelength range. The system of the invention uses detectors, comprising antenna coupled bolometers together with wavelength selective optics. The detector matrix is preferably curved for reducing the number of imaging errors. In order to provide a curved detector matrix, the detector matrix is constituted by flat submatrices, each being provided with one or more integrated antenna coupled bolometers. The detectable frequency range is preferably limited in two stages, first by means of wavelength selective optics and secondly by means of the operating band of the antenna of an antenna coupled bolometer. In order to focus the incoming radiation on bolometers, the bolometer substrate is fitted or the surface or interior of the bolometer substrate is provided with a bolometer lens or a corresponding optical element in alignment with each bolometer.

Imaging system functioning on submillimeter waves

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Arttu Luukanen