Abstract:
The invention relates to a microelectronic sensor device and a method for making optical examinations at a carrier (11), e.g. for the detection of magnetic particles (1) at a contact surface (12) of the carrier (11) by frustrated total internal reflection (FTIR). A light source (21), particularly a laser light source, with a laser modulator (22) are used for emitting an input light beam (L1) into the carrier (11) which is modulated such that optical interferences with reflections (L1') of the input light beam (L1) from the entrance window (14) or other components of the carrier (11) are reduced/minimized. This can for example be achieved by a pulsed on/off modulation in which the first relaxation minimum of a currently emitted pulse (P N ) coincides in the light source (21) with the first relaxation maximum of a reflected pulse (P N-1 '). By reducing the effect of interferences, the setup is less prone to disturbances from dimensional variations that are e.g. induced by thermal extension.
Abstract:
An integrated biosensing device detects emissions from a sample when illuminated. A photo detector (20) is adjacent a site for retaining the sample (40) or receiving excitation radiation for impingement on the sample (40). A reflector (10) deflects the illumination onto the sample site and substantially guides the excitation radiation away from the photo detector. By providing a reflector, a ratio of desired detection of emissions to unwanted detection of the illumination light can be improved. This can be achieved by a reduction in an amount of the illumination reaching the photo detector, and/or by an increase in the amount of illumination of the sample and thus in the amount of emissions reaching the detector. This can be achieved more cost effectively than by using a filter. The illumination can be from above or below if the substrate is transparent.
Abstract:
A miniature readhead for a photometric diagnostic instrument includes a housing of hand-held form factor, configured for receiving reagent sample media therein. The sample media has a plurality of test areas configured to react with, and change color, according to an amount of an analyte in a sample. The holder is sized and shaped for forming an indexed fit with the sample media and includes an array of light sources coupled to the housing, each of the light sources configured to emit light onto a respective one of the test areas. An array of chambers respectively containing an array of light detectors, is configured to enable each of the light detectors to receive diffuse, non-specular reflections of the light from the test areas, while substantially preventing the light detectors from receiving specular reflections of the light.
Abstract:
Described and claimed is an interchangeable tip-open cell fluorometer comprising a housing and a fluorometric probe tip interchangeably connected to the housing, the probe tip including a probe tip housing defining an open cell and enclosing a probe optical arrangement, the probe optical arrangement including an excitation source and a fluorescence detector wherein the excitation source is aimed directly into the fluorescence detector such that a sample can be fluorometrically detected. Also claimed is a method of using this interchangeable tip-open cell fluorometer for detecting fluorescent signals emitted by one or more fluorophores from samples from a natural or industrial water system. The fluorometer, when coupled with a controller, is capable of monitoring and optionally controlling an industrial process or system.
Abstract:
The present invention is directed to the use of a light absorbing wall material (4) to eliminate stray light paths in light-guiding structures, such as those used for HPLC absorbance detection. More specifically, the present invention relates to the use of carbon-doped Teflon ® AF, or "black Teflon ® AF," for all or part of the walls of a light-guiding flowcell (2) adapted for use in HPLC absorbance detection.
Abstract:
An improved optical system for use in an instrument for culturing and detecting the presence of microorganisms in human tissue specimens is disclosed. The improved optical detection system is designed to reduce unwanted noise by substantially blocking all light other than light from a sensor positioned on an inside wall of a culture bottle from reaching the photodetector. A control circuit providing a 'lock-in' detection system designed to reduce unwanted noise is also disclosed. The detection system is capable of rapidly and automatically detecting whether a specimen bottle has been inserted into the instrument.
Abstract:
Die Erfindung betrifft eine Wandlervorrichtung und ein Verfahren zur Messung von zumindest einem Fluidparameter eines in einer Durchflussmesszelle befindlichen Fluids, wobei eine Strahlungsquelle (101) zum Erzeugen einer Anregungsstrahlung und ein auf derselben Ebene wie die Strahlungsquelle (101) angeordneter Detektor (102) zum Erfassen einer durch die Anregungsstrahlung in der Durchflussmesszelle angeregten und zurück reflektierten Fluoreszenzstrahlung nach Durchströmen der Durchflussmesszelle vorgesehen sind, und wobei ein strahlungsunterdrückendes Element (104) in einem direkten Strahlungsweg zwischen der Strahlungsquelle (101) und dem Detektor (102) oder in einem direkten Strahlungsweg zwischen einer Fluoreszenzquelle eines benachbarten Messkanals und dem Detektor angeordnet ist.
Abstract:
Vorrichtung zur Messung von Streulicht aus einem Messvolumen unter Kompensation von Hintergrundsignalen umfassend mindestens einen Lichtsensor (1) mit mindestens zwei getrennt auswertbaren lichtempfindlichen Elementen (1a, 1b), ein einziges abbildendes optisches System (2), wobei die lichtempfindlichen Elemente (1a 1b) in der Bildebene und das Messvolumen in der korrespondierenden Gegenstandsebene des optischen Systems (2) angeordnet sind, die Sichtbereiche der lichtempfindlichen Elemente (1a, 1b) in der Gegenstandsebene komplett voneinander getrennt sind und hinter der Gegenstandsebene einander überlappen, einen Lichtsender (7) mit einem kollimierten Lichtstrahl (8), der nur oder zumindest in stärkerem Maße den Sichtbereich des einen lichtempfindlichen Elements (1b) in einem durch die Gegenstandsebene erstreckten und das Messvolumen begrenzenden Bereich (3b) durchschneidet, sodass dieses lichtempfindliche Element (1b) Streulicht aus dem Messvolumen und Hintergrundlicht aus den überlappenden Sichtbereichen hinter der Gegenstandsebene erfasst und das andere lichtempfindliche Element (1a) kein oder deutlich weniger Streulicht aus dem Messvolumen und Hintergrundlicht aus den überlappenden Sichtbereichen hinter der Gegenstandsebene erfasst, und eine zwischen dem optischen System (2) und den lichtempfindlichen Elementen (1a, 1b) angeordneten Blende (6), welche die Sichtbereiche der lichtempfindlichen Elemente (1a, 1b) hinter der Gegenstandsebene so einschränkt, dass die einander nicht überlappenden Berieche der beiden Sichtbereiche teilweise oder vollständig ausgeblendet werden.