Abstract:
Die Erfindung betrifft ein zweikanaliges Messgerät zur Bestimmung von Gaskonzentrationen. Dies umfasst: - eine erste und eine zweite Lichtquelle, die Licht unterschiedlicher Wellenlängenbereiche in eine Messstrecke senden, - eine Empfangsanordnung, die das Licht der Lichtquellen empfängt, - eine Choppervorrichtung, die zwei für einen der Wellenlängenbereiche hoch reflektierende Spiegel und zwei auf gleichem Teilkreis zwischen den Spiegeln liegende Durchbrüche aufweist, zum wechselweise Durchlassen bzw. Umlenken des Lichts der Lichtquellen, um das Licht auf den selben optischen Weg in die Messstrecke zu bringen - und mit einer Auswerteeinheit zur Auswertung der Empfangssignale und Bestimmung einer Gaskonzentration daraus, - wobei die Empfangsanordnung einen ersten und einen zweiten Empfänger aufweist, - wobei der erste Empfänger der ersten Lichtquelle und der zweite Empfänger der zweiten Lichtquelle zugeordnet ist zum Empfang des Lichts entsprechender Wellenlänge - und wobei die Choppervorrichtung auch Teil der Empfangsanordnung ist und die Choppervorrichtung das Licht nach Durchlaufen der Messstrecke durch Umlenken bzw. Durchlassen von demselben optischen Weg trennt und dem entsprechenden Empfänger zuordnet. Erfindungsgemäß ist die Choppervorrichtung als ein einziges Chopperrad ausgebildet und die Spiegel sind als Sektoren des Chopperrads ausgebildet, so dass die Spiegelflächen senkrecht zur Rotationsachse des Chopperrades liegen.
Abstract:
A multi-spectral aerosol particle measurement system (100) including a long wavelength (e g, UV light, 340 nm) emitter (102) and a short wavelength (e g, UV light, 280 nm) emitter (108), an emitter reflector (114) such as a dichroic filter, that is transparent to long wavelength radiation (104) and reflective to short wavelength radiation (110), a flowing fluid (116) that contains particles (118) that may intersect first direction (106) such that they are sequentially exposed, producing elastic and inelastic emission wavelengths, including fluorescence, a collimating lens (122), and a detector reflector (124) to reflect short wavelength radiation and pass fluorescent radiation through one of a plurality of filters (126a-d) placed in the optical path of a detector (128) The detector reflector (124) reflects light having a wavelength shorter than 300 nm, so elastic scatter is detected by the light scatter detector (190).
Abstract:
An object (206) to be imaged or detected is illuminated by a single broadband light source or multiple light sources emitting light at different wavelengths. The light is detected by a detector (200), which includes a light-detecting sensor (400) covered by a hybrid filter. The hybrid filter includes a multi-band narrowband filter (516) mounted over a patterned filter layer (508). The light strikes the narrowband filter (516), which passes light at or near the multiple wavelengths of interest while blocking light at all other wavelengths. The patterned filter layer (508) alternately passes the light at one particular wavelength while blocking light at the other wavelengths of interest. This allows the sensor (400) to determine either simultaneously or alternately the intensity of the ligth at the wavelengths of interest. Filters (902) may also be mounted over the light at the light sources to narrow the spectra of the light sources.
Abstract:
A tunable bolometer device for detecting infrared light (IR) from a target at spécific frequencies and in a broadband mode. The device may have an array of pixels of which each is controllable to be sensitive to a particular wavelength of light that is selected and detected. The detection of particular frequencies on a pixel level may result in spectral analysis of the target. Further, each pixel of the bolometer via an associated etalon may be tuned to detect a different frequency of IR or be switched to broadband detection of IR. The device may be packaged in an integrated vacuum package where the etalon array becomes the topcap which is bonded to the wafer containing the bolometer array.
Abstract:
There is described a system and method for the in vivo determination of lactate levels in blood using Near-Infrared Spectroscopy (NIRS)and/or Near-infrared Raman Spectroscopy (NIR-RAMAN). The method teaches measuring lactate in vivo comprising: optically coupling a body part (14) with a light source (10) and a light detector (18) the body part having tissues comprising blood vessels; injecting near-infrared (NIR) light at one or a plurality of wavelengths in the body part; detecting, as a function of blood volume variations in the body part, light exiting the body part at at least the plurality of wavelengths to generate an optical signal (20); and processing the optical signal as a function of the blood volume variations to obtain a lactate level in blood.
Abstract:
A chemical sensor, such as a fiber optic chemical sensor, is self-calibrated by measuring two output values which behave differently in response to an analyte, and forming a ratio between the two measured output values to cancel out effects of variations in external factors such as temperature variations differences between coatings, light (illuminator) variations, fouling, bleaching, leaching or the like. An indicator material may be used which produces both fluorescence and phosphorence, both monomer and aggregate emission or absorption bands, emission or absorption bands with or without an isosbestic point, emission peaks at one wavelength at two different excitation bands, or emission peaks at two wavelengths for excitation at two wavelengths.
Abstract:
Un capteur chimique, tel qu'un capteur chimique à fibre optique, est auto-calibré en mesurant deux valeurs de sortie qui se comportent différemment en réponse à un analyte, et en établissant un rapport entre les deux valeurs de sortie mesurées pour annuler les effets des variations des facteurs externes comme les variations de température, les différences existant entre les revêtements, les variations de la lumière (source lumineuse), l'adsorption de colorants, le blanchiment, le lessivage ou autre. On peut utiliser un matériau indicateur qui produit de la fluorescence et de la phosphorescence, des bandes d'absorption ou d'émission de monomère et d'agrégat, des bandes d'émission ou d'absorption ayant ou non un point isobestique, des pics d'émission à une longueur d'onde au niveau de deux bandes d'excitation différentes, ou des pics d'émission à deux longueurs d'ondes pour l'excitation au niveau de deux longueurs d'ondes.
Abstract:
A photometric light absorption measuring apparatus includes a central processing unit sending generator frequency data to a high power generator that pulses a light source intermittently to irradiate a liquid sample contained in a transparent receptacle. The intermittent light beams pass through optical guides, focusing lenses, light amplifiers and a slit aperture. A diffraction grating disperses the light beams and a light detector receives the spectral components and generates corresponding intensity signals which are passed through an amplifier and supplied to an arithmetical unit which receives frequency power generation signals from the central processing unit. A misfire detector sends signals to the arithmetical unit when the light source fails to flash. The arithmetical unit preselects two spectral components and calculates the concentration of a corresponding preselected constituent of the liquid sample from the average mean value of the intensity differences between the two preselected spectral components corrected to eliminate intensity data corresponding to non-flashes of the light source.
Abstract:
본 발명은, 가스 농도의 판정을 위한 2 개의 스펙트럼 채널들을 갖는 측정 장치로서, 측정 경로 내로 상이한 파장 범위들의 광을 전송하는 제 1 및 제 2 광원; 광원들로부터 광을 수용하는 리시버 배열체; 광원들로부터 광이 지나가는 것을 번갈아 허용하고 그리고/또는 동일한 광학 경로를 통해 광을 측정 경로 내로 가져오게 하도록 광원들로부터 광을 굴절시키기 위해서 파장 범위들 중 하나의 범위에 대해 적어도 하나의 높은 반사 섹터를 갖는 초퍼 장치; 및 수용된 신호들의 평가 및 이 평가로부터 가스 농도의 판정을 위한 평가 유닛을 포함한다. 단순한 설계이며, 광 세기 손실들이 적게 존재하는 개선된 2 채널식 측정 장치를 제공하기 위해서, 리시버 배열체가 제 1 및 제 2 리시버를 가지며, 상기 제 1 리시버는 제 1 광원과 연관되며, 상기 제 2 리시버는 대응하는 파장의 광의 수용을 위해 제 2 광원과 연관되며; 초퍼 장치는 또한 리시버 배열체의 일부이며, 상기 초퍼 장치는 광의 굴절에 의해 및/또는 광을 지나가게 허용함으로써 측정 경로를 따라 동일한 광학 경로를 후속하는 통로로부터 광을 분리하며, 해당 리시버와 광을 연관시키는 것이 제안된다.