Abstract:
A shutter assembly includes a first shutter blade having a first toothed arm extending therefrom and a first light transmitting aperture therein, and a second shutter blade positioned adjacent and parallel to the first shutter blade. The second shutter blade has a second toothed arm extending therefrom and a second light transmitting aperture therein. The first and second shutter blades are supported to allow parallel linear motion. A motor gear is disposed between, and meshed with, the first and second toothed arms such that rotation of the gear causes the first and second shutter blades to move linearly in opposite directions between an open position in which the first and second light transmitting apertures are in an overlapping relationship with respect to one another, and a closed position in which the first and second light transmitting apertures are in a non-overlapping relationship with respect to one another.
Abstract:
An apparatus for measuring light in samples using a high intensity light source (12), is presented. The system utilizes bifurcated fiber bundle (26) to transmit light at the excitation and emission wavelength bands. It also uses a band-pass filter (36) for eliminating extraneous light, including that which corresponds to the excitation wavelength range, while permitting the emitted light to pass to a detector (41) for quantitation. The system employs a shutter (39) to shield the detector (41) while the laser light source is activated, and a controller to intermittently activate the laser light and close the shutter. The apparatus preferably includes lenses (16, 17, 37) for better illumination and read out conditions. The apparatus is employed in Luminescence Oxygen Channeling Immunoassays. The method has high sensitivity, accuracy and precision, and the apparatus is highly compact. Accordingly, the analyzer can perform assays in nanoliter to microliter sample volumes in standard microplates having at least 96, 384 or 1536 wells.
Abstract:
An apparatus for measuring light in samples using a high intensity light source (12), is presented. The system utilizes bifurcated fiber bundle (26) to transmit light at the excitation and emission wavelength bands. It also uses a band-pass filter (36) for eliminating extraneous light, including that which corresponds to the excitation wavelength range, while permitting the emitted light to pass to a detector (41) for quantitation. The system employs a shutter (39) to shield the detector (41) while the laser light source is activated, and a controller to intermittently activate the laser light and close the shutter. The apparatus preferably includes lenses (16, 17, 37) for better illumination and read out conditions. The apparatus is employed in Luminescence Oxygen Channeling Immunoassays. The method has high sensitivity, accuracy and precision, and the apparatus is highly compact. Accordingly, the analyzer can perform assays in nanoliter to microliter sample volumes in standard microplates having at least 96, 384 or 1536 wells.
Abstract:
A fluorophotometer for use in automatic equipment of chemical analysis is disclosed which includes a shutter (45) provided in an optical system (17 to 22, 25) on the exciting light side for blocking the optical path of exciting light, a shutter driving device (44) for driving the shutter so that the shutter is kept at a state that the optical path of exciting light is blocked and then kept a state that the optical path of exciting light is made open, each time a train of reaction vessels is intermittently moved, and a processor (43) for storing a first output signal which is delivered from a photodetector (30) for the detection of fluorescence in a period when the optical path of exciting light is blocked, and for correcting a second output signal which is delivered from the photodetector in a period when the optical path of exciting light is made open, by the first output signal. Further, a method of measuring the intensity of fluorescence in the automatic equipment of chemical analysis is disclosed.
Abstract:
A fluorophotometer for use in automatic equipment of chemical analysis is disclosed which includes a shutter (45) provided in an optical system (17 to 22, 25) on the exciting light side for blocking the optical path of exciting light, a shutter driving device (44) for driving the shutter so that the shutter is kept at a state that the optical path of exciting light is blocked and then kept a state that the optical path of exciting light is made open, each time a train of reaction vessels is intermittently moved, and a processor (43) for storing a first output signal which is delivered from a photodetector (30) for the detection of fluorescence in a period when the optical path of exciting light is blocked, and for correcting a second output signal which is delivered from the photodetector in a period when the optical path of exciting light is made open, by the first output signal. Further, a method of measuring the intensity of fluorescence in the automatic equipment of chemical analysis is disclosed.
Abstract:
Un assemblage de support d'echantillons et d'obturateurs (20) pour photometre comprend un corps de chambre d'echantillon nage fixe (40) monte a proximite d'un dispositif photosensible (18). Un passage lumineux est prevu de la chambre d'echantillonnage (53) au dispositif photosensible (18) et un obturateur est prevu pour fermer et ouvrir de maniere selective le trajet de la lumiere entre le dispositif photosensible (18) et la chambre d'echantillonnage (53) sans deplacer celle-ci. Des moyens d'echange de chaleur comprenant une pompe de chaleur (63) et un reservoir de chaleur (68) sont prevus pour maintenir la temperature desiree dans la chambre (53). Le corps de la chambre d'echantillonnage (40) est relie thermiquement a la pompe de chaleur (63) et est de preference isole thermiquement des moyens ou il est monte. Dans une realisation, la pompe de chaleur (63) et le reservoir de chaleur (68) sont relies de maniere souple.
Abstract:
Die Erfindung betrifft ein Streulichtanalysesystem (1) mit mindestens einem Mittel (8) zur Erzeugung eines Strahlenbündels entlang einer optischen Achse (30), mindestens einer Aufnahmeposition (4) für eine Messzelle (2), mindestens einem Mittel (25, 26, 27, 28, 29) zur Fokussierung eines Strahlenbündels, mindestens einer Blende (14) mit einer definierten Öffnung (17) und mindestens einem Fotodetektor (6), wobei das Mittel (8) zur Erzeugung eines Strahlenbündels ein in mindestens einer Richtung senkrecht zur optischen Achse (30) konvergentes Strahlenbündel erzeugt und wobei das Mittel (8) zur Erzeugung eines Strahlenbündels, die Aufnahmeposition (4) für eine Messzelle (2), das Mittel (25, 26, 27, 28, 29) zur Fokussierung eines Strahlenbündels, die Blende (14) und der Fotodetektor (6) derart angeordnet sind, dass das konvergente Strahlenbündel in einer in der Aufnahmeposition (4) angeordneten Messzelle (2) einen ersten Fokus (35) ausbildet und nach dem Durchtritt durch eine in der Aufnahmeposition (4) angeordnete Messzelle (2) wenigstens teilweise auf das Mittel (25, 26, 27, 28, 29) zur Fokussierung eines Strahlenbündels trifft und wobei das Strahlenbündel nach Wechselwirkung mit dem Mittel (25, 26, 27, 28, 29) zur Fokussierung des Strahlenbündels einen zweiten Fokus (37) ausbildet und wobei die Öffnung (17) der Blende (14) im Bereich des zweiten Fokus (37) positioniert ist, und das Strahlenbündel dann wenigstens teilweise auf den Fotodetektor (6) trifft.
Abstract:
A method and apparatus for visually detecting when a luminescent dissolved oxygen sensor is operating is disclosed. In one example embodiment of the invention, a shutter (216) is placed into the light tight container. When the shutter (216) is open, a user can see into the light tight container and verify probe operation. When the shutter (216) is closed, external light is prevented from entering the light tight container and affecting measurement accuracy. In another example embodiment of the invention, one end of a light pipe (526) is placed on the outside of the light tight container, and the other end is positioned to view the light source (504) of the probe. In another example embodiment of the invention a second light source (628), visible on the outside of the light tight container, is used to verify operation of the probe. In another example embodiment of the invention, a predetermined area is left open in the optically opaque hydrostatically transparent (814) on the face of the sensor window, allowing a user to see light from the sensor when the sensor is operating properly.
Abstract:
The present invention relates to an apparatus and method for imaging time resolved fluorescence in biochemical and medical samples. In a primary aspect, the device includes a lens of large aperture, a flash lamp in the illumination path, a fast-acting solid state shutter or a gated detector in the emission path, a device for delivering homogenous monochromatic illumination to a plurality of wells distributed within a microwell plate, a digital camera of high quantum efficiency, and a computer. under computer control, the lamp is pulsed at short intervals. The fast-acting emission shutter or gated detector operates to limit exposure of the camera to a period some microseconds after the extinction of each lamp pulse, during which only delayed fluorescence is transmitted to the camera. The invention achieves simultaneous time resolved imaging of a plurality of samples, with high sensitivity and high throughput.