SYSTEM AND METHOD FOR OPTICAL MEASUREMENT OF A TARGET

摘要

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.

主权项

1. System for optical measurement of a target, the system comprising a detector for receiving measurement light beam from or through the target, and optionally a light source for illuminating the target with an illuminating light beam, wherein the system comprises at least one first Fabry-Perot interferometer within the path of the illuminating light beam and/or the path of the measurement light beam, wherein
at least one light transmission characteristic of each said first at least one Fabry-Perot interferometer is controllable, and the system has first means for controlling the pass band of each said first at least one Fabry-Perot interferometer, and the first means for controlling are arranged to make the first at least one Fabry-Perot interferometer to scan its pass band through a predetermined wavelength range, and to control the scanning rate in order to provide a predetermined spectral distribution of transmittance over the scanning period.