Patents by Inventor Uula Kantojarvi
Uula Kantojarvi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11698303Abstract: According to an example aspect of the present invention, there is provided a method for analysing a chemical composition of a target, the method comprising placing an electrically tunable Fabry-Perot interferometer in a path of radiation emitted by a radiation source, and detecting the radiation, which has passed the Fabry-Perot interferometer and which has passed or was reflected by the target, by means of a detector, and wherein detection is made such that multiple pass bands are allowed to be detected simultaneously.Type: GrantFiled: December 28, 2018Date of Patent: July 11, 2023Assignee: Spectral Engines OyInventors: Jarkko Antila, Uula Kantojärvi
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Publication number: 20200209150Abstract: According to an example aspect of the present invention, there is provided a method for analysing a chemical composition of a target, the method comprising placing an electrically tunable Fabry-Perot interferometer in a path of radiation emitted by a radiation source, and detecting the radiation, which has passed the Fabry-Perot interferometer and which has passed or was reflected by the target, by means of a detector, and wherein detection is made such that multiple pass bands are allowed to be detected simultaneously.Type: ApplicationFiled: December 28, 2018Publication date: July 2, 2020Inventors: Jarkko Antila, Uula Kantojärvi
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Publication number: 20170350760Abstract: The present invention concerns an optical measurement system comprising an electrically tunable Peltier element, a detector for detecting radiation from a radiation source in a measurement area, the detector being in thermal connection with the Peltier element, an electrically tunable Fabry-Perot interferometer placed in the path of the radiation prior to the detector, the Fabry-Perot interferometer being in thermal connection with the Peltier element, and control electronics circuitry configured to control the Peltier element, the interferometer, and the detector. The present invention further concerns a method for analyzing the spectrum of an object.Type: ApplicationFiled: November 5, 2015Publication date: December 7, 2017Applicant: Spectral Engines OyInventors: Jarkko Antila, Uula Kantojärvi, Jussi Mäkynen
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Publication number: 20170322085Abstract: The present invention concerns a method for an optical measurement method including the following steps: illuminating an object by light, receiving light from the illuminated object to a tunable Fabry-Perot interferometer, changing mirror gap of the Fabry-Perot interferometer, and detecting the signal passed through the mirror gap of the Fabry-Perot interferometer at different gap lengths. In accordance with the invention the detection is performed at different lengths of times at different gap lengths.Type: ApplicationFiled: November 4, 2015Publication date: November 9, 2017Inventors: Jarkko Antila, Uula Kantojärvi, Jussi Mäkynen
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Publication number: 20170138790Abstract: A method for determining spectral calibration data (?cal(Sd), Sd,cal(?)) of a Fabry-Perot interferometer (100) comprises: forming a plurality of filtered spectral peaks (P?1, P?2) by filtering input light (LB1) with a Fabry-Perot etalon (50) such that a first filtered peak (P?1) corresponds to a first transmittance peak (P1) of the etalon (50), and such that a second filtered peak (P?2) corresponds to a second transmittance peak (P1) of the etalon (50), using the Fabry-Perot interferometer (100) for measuring a spectral intensity distribution (M(Sd)) of the filtered spectral peaks (P?1, P?2), wherein the spectral intensity distribution (M(Sd)) is measured by varying the mirror gap (dFP) of the Fabry-Perot interferometer (100), and by providing a control signal (Sd) indicative of the mirror gap (dFP), and determining the spectral calibration data (?cal(Sd), Sd,cal(?)) by matching the measured spectral intensity distribution (M(Sd)) with the spectral transmittance (TE(?)) of the etalon (50).Type: ApplicationFiled: June 29, 2015Publication date: May 18, 2017Inventors: Jarkko Antila, Uula Kantojärvi, Altti Akujärvi, Mikko Tuohiniemi, Jussi Mäkynen
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Patent number: 9581499Abstract: The invention relates to a system and a method for optical measurement of a target, wherein the target is illuminated, either actively illuminated, reflecting ambient light, or self illuminating, and a measurement light beam received from the target or through it is detected. The prior art optical measurement systems generally include mechanical filter wheels and photomultiplier tubes, which cause the equipment to be expensive, large-sized and often not sufficiently accurate and stable. The objective of the invention is achieved with a solution, in which the illuminating light beam and/or measurement light beam is led through a Fabry-Perot interferometeror a set of two or more Fabry-Perot Interferometers, and the Fabry-Perot interferometer or a set of two or more Fabry-Perot Interferometersis controlled into different modes during the measurement of a single target. The invention can be applied inoptical measurements where, for example, reflectance, absorption of fluorescence of the target is measured.Type: GrantFiled: April 8, 2014Date of Patent: February 28, 2017Assignee: Teknologian tutkimeskeskus VTTInventors: Heikki Saari, Christer Holmlund, Uula Kantojarvi, Rami Mannila, Antti Lamminpaa, Pekka Teppola
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Publication number: 20140218736Abstract: The invention relates to a system and a method for optical measurement of a target, wherein the target is illuminated, either actively illuminated, reflecting ambient light, or self illuminating, and a measurement light beam received from the target or through it is detected. The prior art optical measurement systems generally include mechanical filter wheels and photomultiplier tubes, which cause the equipment to be expensive, large-sized and often not sufficiently accurate and stable. The objective of the invention is achieved with a solution, in which the illuminating light beam and/or measurement light beam is led through a Fabry-Perot interferometer or a set of two or more Fabry-Perot Interferometers, and the pass band of the Fabry-Perot interferometer or a set of two or more Fabry-Perot Interferometers is controlled during the measurement of a single target. The invention can be applied in optical measurements where, for example, reflectance, absorption of fluorescence of the target is measured.Type: ApplicationFiled: April 8, 2014Publication date: August 7, 2014Applicant: Teknologian tutkimeskeskus VTTInventors: Heikki SAARI, Christer HOLMLUND, Uula KANTOJARVI, Rami MANNILA, Antti LAMMINPAA, Pekka TEPPOLA
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Patent number: 8792100Abstract: The invention relates to a system and a method for optical measurement of a target, wherein the target is illuminated, either actively illuminated, reflecting ambient light, or self illuminating, and a measurement light beam received from the target or through it is detected. The prior art optical measurement systems generally include mechanical filter wheels and photomultiplier tubes, which cause the equipment to be expensive, large-sized and often not sufficiently accurate and stable. The objective of the invention is achieved with a solution, in which the illuminating light beam and/or measurement light beam is led through a Fabry-Perot interferometer or a set of two or more Fabry-Perot Interferometers, and the Fabry-Perot interferometer or a set of two or more Fabry-Perot Interferometers is controlled into different modes during the measurement of a single target. The invention can be applied in optical measurements where, for example, reflectance, absorption of fluorescence of the target is measured.Type: GrantFiled: March 31, 2010Date of Patent: July 29, 2014Assignee: Teknologian Tutkimu Skeskus VTTInventors: Heikki Saari, Christer Holmlund, Uula Kantojarvi, Rami Mannila, Antti Lamminpaa, Pekka Teppola
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Patent number: 8780356Abstract: An imaging spectrometer includes a Fabry-Perot interferometer and an image sensor having color-sensitive pixels. The interferometer has a first transmission peak and a second transmission peak (PEAK2). A method calibrating the spectrometer includes providing first calibration light, which has a narrow spectral peak, obtaining first detector signal values from the image sensor by coupling the first calibration light into the spectrometer when the reference spectral peak is near a first spectral position, obtaining second detector signal values from the image sensor by coupling the first calibration light into the spectrometer when the reference spectral peak is near a second spectral position, providing second calibration light, which has a broad bandwidth, and obtaining third detector signal values from the image sensor by coupling the second calibration light into the spectrometer.Type: GrantFiled: October 9, 2013Date of Patent: July 15, 2014Assignee: Teknologian Tutkimuskeskus VTTInventors: Heikki Saari, Jussi Mäkynen, Christer Holmlund, Uula Kantojärvi, Jarkko Antila, Rami Mannila
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Publication number: 20140176729Abstract: An imaging spectrometer includes a Fabry-Perot interferometer and an image sensor having color-sensitive pixels. The interferometer has a first transmission peak and a second transmission peak (PEAK2). A method calibrating the spectrometer includes providing first calibration light, which has a narrow spectral peak, obtaining first detector signal values from the image sensor by coupling the first calibration light into the spectrometer when the reference spectral peak is near a first spectral position, obtaining second detector signal values from the image sensor by coupling the first calibration light into the spectrometer when the reference spectral peak is near a second spectral position, providing second calibration light, which has a broad bandwidth, and obtaining third detector signal values from the image sensor by coupling the second calibration light into the spectrometer.Type: ApplicationFiled: October 9, 2013Publication date: June 26, 2014Applicant: Teknologian Tutkimuskeskus VTTInventors: Heikki SAARI, Jussi MÄKYNEN, Christer HOLMLUND, Uula KANTOJÄRVI, Jarkko Antila, Rami MANNILA
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Publication number: 20120038928Abstract: The invention relates to a system and a method for optical measurement of a target, wherein the target is illuminated, either actively illuminated, reflecting ambient light, or self illuminating, and a measurement light beam received from the target or through it is detected. The prior art optical measurement systems generally include mechanical filter wheels and photomultiplier tubes, which cause the equipment to be expensive, large-sized and often not sufficiently accurate and stable. The objective of the invention is achieved with a solution, in which the illuminating light beam and/or measurement light beam is led through a Fabry-Perot interferometer or a set of two or more Fabry-Perot Interferometers, and the Fabry-Perot interferometer or a set of two or more Fabry-Perot Interferometers is controlled into different modes during the measurement of a single target. The invention can be applied in optical measurements where, for example, reflectance, absorption of fluorescence of the target is measured.Type: ApplicationFiled: March 31, 2010Publication date: February 16, 2012Applicant: TEKNOLOGIAN TUTKIMESKESKUS VTTInventors: Heikki Saari, Christer Holmlund, Uula Kantojarvi, Rami Mannila, Antti Lamminpaa, Pekka Teppola