Abstract:
An optical system comprising a randomizer that has a plurality of randomly positioned scatterers for scattering and thereby randomizing light to generate a speckle pattern and a detector for detecting the speckle pattern to determine at least one property of the light and/or change in at least one property of the light.
Abstract:
A hand held spectrometer is used to illuminate the object and measure the one or more spectra. The spectral data of the object can be used to determine one or more attributes of the object. In many embodiments, the spectrometer is coupled to a database of spectral information that can be used to determine the attributes of the object. The spectrometer system may comprise a hand held communication device coupled to a spectrometer, in which the user can input and receive data related to the measured object with the hand held communication device. The embodiments disclosed herein allow many users to share object data with many people, in order to provide many people with actionable intelligence in response to spectral data.
Abstract:
An optical system comprising a randomizer that has a plurality of randomly positioned scatterers for scattering and thereby randomizing light to generate a speckle pattern and a detector for detecting the speckle pattern to determine at least one property of the light and/or change in at least one property of the light.
Abstract:
L'invention concerne un microspectromètre par ondes évanescentes comprenant : un dioptre plan (D) séparant deux milieux transparents, un capteur optique (30) comprenant un réseau de pixels, et disposé dans le deuxième milieu transparent (M2), et un dispositif d'interférences ((10, F1); (11, F1_1, F1_2)) disposé tel qu'une partie au moins dudit dispositif d'interférences soit au contact d'ondes évanescentes générées à la surface du dioptre. Il est essentiellement caractérisé en ce qu'il comprend aussi : une mémoire stockant une cartographie (40) comprenant un ensemble de grilles de données (41, 42, 43) comprenant la réponse optique dudit capteur (30) pour un ensemble de longueurs d'onde quasi monochromatiques d'une source lumineuse de calibration, et un calculateur (50) configuré pour déterminer le spectre ( ψ) d'une source lumineuse test configurée pour générer des ondes évanescentes à la surface dudit dioptre (D), en fonction de ladite cartographie (40) et de la réponse optique dudit capteur (30).
Abstract:
The present invention relates to a ring-down spectrometry apparatus (1) in absorption saturation condition, for measuring the concentration of a gas through a measurement of the spectrum of a molecular transition of said gas, comprising: a laser source (2) adapted to emit an electromagnetic radiation beam having a predetermined wavelength in the infrared spectrum, said laser radiation being emitted intermittently or quickly shifted in frequency; means for varying the wavelength of said radiation emitted by said laser; a resonant cavity (3) adapted to contain said gas to be detected and comprising a first and a second reflecting mirror (4a, 4b) so as to form an optical path for the electromagnetic radiation emitted by said laser source (2), the distance between said first and said second mirror (4a, 4b) being adjustable so as to couple said electromagnetic radiation to said cavity (3) and bring said cavity in resonance or out of resonance with said electromagnetic radiation; a photodetector (7) adapted to detect an electromagnetic radiation beam in output from said cavity (3) and adapted to generate a decay signal, said decay signal being a decay signal in laser-gas resonance or laser-gas non-resonance; an electronic circuit (12, 13) receiving in input the signal in output from the photodetector (7) and adapted to convert it in a signal in input to a processor; a processor adapted to receive said decay signal from the photodetector (7), said processor including: Interpolation means adapted to perform an interpolation of said decay signal in laser-gas non-resonance so as to obtain one or more calibration coefficients as interpolation parameters, subtraction means of said calibration coefficients from the decay signal in laser-gas resonance so as to obtain a corrected decay signal in laser-correct resonance; said interpolation means being adapted to perform an interpolation of said corrected decay signal in laser-gas resonance so as to obtain a concentration of said gas as interpolation parameter; a diffuser element (8), disposed between said photodetector (7) and said cavity (3), adapted to spread said electromagnetic radiation from said cavity on an optical plane of said photodetector (7).
Abstract:
Es wird bereitgestellt ein Spektrometer mit einem Detektor (3) und einem transparenten Körper (2), der eine Eintrittsfläche (7) und eine Austrittsfläche (8) auf einer Vorderseite (5) des Körpers (2) und ein Reflexionsgitter (9) auf einer Rückseite (6) des Körpers (2) aufweist, wobei ein über die Eintrittsfläche (7) in den Körper (2) eintretendes Strahlenbündel (S) an dem Reflexionsgitter (9) zur Austrittsfläche (8) hin reflektiert und dabei spektral aufgespalten wird und durch die Austrittsfläche (9) tritt und auf den Detektor (3) trifft, und wobei die Rückseite (6) zumindest im Bereich des Reflexionsgitters (9) so gekrümmt ist, daß bei Reflexion am Reflexionsgitter (9) eine Fokussierung des Strahlenbündels (S) in horizontaler und vertikaler Ebene bewirkt wird.