Abstract:
Die vorliegende Erfindung betrifft eine Messlichtquelle zum Erzeugen von Messlicht mit einer gleichmäßigen räumlichen Beleuchtungsstärkeverteilung. Die Messlichtquelle umfasst einen Hohlkörper (01) mit einer diffus reflektierenden Innenfläche. Im Hohlkörper (01) sind ein konkaver, hohlspiegelförmiger Beleuchtungsraum (04), ein rohrartiger Lichtformungsraum (06) und ein konkaver, hohlspiegelförmiger Lichtaustrittsraum (07) ausgebildet, die eine gemeinsame Achse (03) aufweisen. Im Beleuchtungsraum (04) ist eine Lichtquelle (08) zum Erzeugen von Licht zumindest teilweise angeordnet. Der Lichtaustrittsraum (07) weist einen Lichtaustritt (14) auf. Der Beleuchtungsraum (04) und der Lichtaustrittsraum (07) stehen sich mit ihren Hohlspiegelformen gegenüber und sind durch den rohrartigen Lichtformungsraum (06) verbunden. Erfindungsgemäß ist im Hohlkörper (01) eine diffus reflektierende Reflexionsscheibe (11) zum Reflektieren des von der im Lichtaustrittsraum (07) angeordneten Innenfläche des Hohlkörpers (01) reflektierten Lichtes durch den Lichtaustritt (14) nach außerhalb des Hohlkörpers (01) angeordnet. Im Weiteren betrifft die Erfindung eine Messanordnung zum Erfassen eines absoluten Reflexionsspektrums einer Probe und zum Durchführen einer Referenzmessung.
Abstract:
Described herein are optical sensing devices for photonic integrated circuits (PICs). A PIC may comprise a plurality of waveguides formed in a silicon on insulator (SOI) substrate, and a plurality of heterogeneous lasers, each laser formed from a silicon material of the SOI substrate and to emit an output wavelength comprising an infrared wavelength. Each of these lasers may comprise a resonant cavity included in one of the plurality of waveguides, and a gain material comprising a non-silicon material and adiabatically coupled to the respective waveguide. A light directing element may direct outputs of the plurality of heterogeneous lasers from the PIC towards an object, and one or more detectors may detect light from the plurality of heterogeneous lasers reflected from or transmitted through the object.
Abstract:
The purpose is to rapidly and easily correct a spectral characteristic measuring device regardless of the change in spectral distribution of a monochromatic light for correction. To achieve the object, a spectral characteristic measuring device includes a spectrometer and a control device. In the spectrometer, the light passed through an opening of a light shielding body is dispersed by an optical system and irradiated on a light receiving unit in which a plurality of light receiving elements are arrayed to form a dispersion image. In the control device, wavelength information indicating a correspondence relationship between the plurality of light receiving elements and wavelengths of pieces of lights is stored, where first and second intensity distributions of the light related to first and second dispersion images are acquired based on a signal outputted from each of the light receiving elements when the monochromatic light is passed through the opening and first and second dispersion images related to primary diffracted light and secondary diffracted light are formed on the light receiving unit, and an estimated intensity distribution of the light related to the second dispersion image is calculated from the first intensity distribution according to a predetermined relational expression. In the control device, a change amount related to the wavelength information is calculated based on the estimated intensity distribution and the second intensity distribution, and the wavelength information is corrected according to the change amount.
Abstract:
This invention relates to a source for emitting radiation in the infrared range comprising a thin membrane including a radiation element made from a semi-conductive material having a chosen dopant, the radiation element being connected to a frame, the frame comprising connector means for connecting to a power source for conducting an electrical current through the substrate, the radiation element being provided with a periodic modulation of the refractive index constituting a photonic crystal having a chosen period, thus defining an optical resonator at one or more chosen wavelengths, and wherein the membrane is mounted to the substrate through a number of conductor beams distributed along the membrane circumference so as to provide an even current distribution and thus even heating over the membrane.
Abstract:
A spectrometer according to one aspect may include a plurality of light sources configured to emit light to a target object, a plurality of wavelength controllers installed on one surface of each of the plurality of light sources and configured to adjust a peak wavelength band of each of the light sources, and a detection unit configured to detect light returning from the target object.
Abstract:
A system for wide-range spectral measurement includes one or more broadband sources, an adjustable Fabry-Perot etalon, and a detector. The one or more broadband sources is to illuminate a sample, wherein the one or more broadband sources have a short broadband source coherence length. The adjustable Fabry-Perot etalon is to optically process the reflected light to extract spectral information with fine spectral resolution. The detector is to detect reflected light from the sample, wherein the reflected light is comprised of multiple narrow-band subsets of the illumination light having long coherence lengths and is optically processed using a plurality of settings for the adjustable Fabry-Perot etalon, and wherein the plurality of settings includes a separation of the Fabry-Perot etalon plates that is greater than the broadband source coherence length but that is less than the long coherence lengths.
Abstract:
The present invention relates to a spectroscopy device, comprising an analysis zone (2) for receiving a sample; at least one light-emitting diode (3) arranged to emit a light beam (4)towards the analysis zone (2), having a luminous intensity spectral profile in a working wavelength interval; means (5) for varying with time the luminous intensity spectral profile emitted by said diode (3) in the working wavelength interval of said diode; a detector (6, 8, 9), arranged to receive, during a variation with time of the luminous intensity spectral profile emitted by said diode (3), the light beam (4) emitted by said diode (3) and having crossed the analysis zone (2), and supplying a detection signal (Α') of the light beam emitted by said diode (3) and received by the detector, in the form of a signal which depends on at least one characteristic representative of the luminous intensity spectral profile of said light-emitting diode. Application to derivative spectroscopy
Abstract:
The present invention relates to the multispectral imaging of samples, in particular of biological tissues. The invention further relates to a method for acquisition of fluorescence images and reflection images of an object (400) comprising the steps of alternatingly illuminating the object (400) with at least a first light and a second light, wherein the first light and the second light are spectrally shaped such that at least one light has several spectral regions of high light intensity separated by spectral region(s) of low light intensity, wherein the spectral regions of the first light and the second light with high intensity at least partially do not overlap and wherein at least one of the two lights has at least one region of low light intensity that is of longer wavelength to the neighboring region of high light intensity, and recording at least a first image of the object (400) and a second image of the object (400) while illuminating the object (400) with at least one of the lights wherein the light to be recorded as the first image is modified such, that at least one spectral region of high intensity of the second light is attenuated, and wherein the light to be recorded as the second image is modified such, that at least one spectral region of high intensity of the first light is attenuated.