Teknologian Tutkimuskeskus Vtt

Teknologian Tutkimeskeskus Vtt

Pekka Teppola

Heikki Saari

Christer Holmlund

Rami Mannila

Antti Lamminpaa

Uula Kantojarvi

Mikko Juuti

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.

System and method for optical measurement of a target

An optical apparatus comprises an ultraviolet light source () configured to transmit the ultraviolet light to a sample (), one or more wavelength dependent beam splitters () and at least two separate detectors (). Each beam splitter () receives, from the sample (), a band of excitating ultraviolet light and at least one band of fluorescence associated with an interaction between the excitating ultraviolet light and the sample () in the optical path through the sample (), directs the band of excitating ultraviolet light passed through the sample () towards a first detector (), and directs the at least one band of the fluorescence towards at least one separate detector (). The first detector () and the at least one separate detector () are simultaneously configured to form electrical signals carrying information on powers of the bands of the ultraviolet light and the fluorescence, respectively. The signal processing unit () configured to measure the at least one property of the sample () on the basis of a signal from the first detector () and each signal from the at least one separate detector ().

Optical apparatus and method for fluorescence measurement of analytes comprising backscattering detection

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.

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Vtt, Finland

Pekka Teppola