Abstract:
A gas sensor comprises a cavity for containing a gas, means for generating radiation which is transmitted through the cavity and includes one or more wavelengths which is absorbed in use by a gas to be detected; and a detector for detecting radiation which has passed through the cavity. The walls of the cavity are sufficiently reflective to the radiation that the cavity is substantially uniformally illuminated with the radiation.
Abstract:
The invention relates to devices and methods for detecting specific interactions between probe and target molecules. The invention especially relates to a device for the qualitative and/or quantitative detection of molecular interactions between probe and target molecules, which comprises a) a microarray comprising a substrate on which probe molecules are immobilized on array elements, said microarray being located on a first surface of the device; and b) a reaction chamber that is defined between the first area with the microarray disposed thereon and a second surface, the distance between the microarray and the second surface being modifiable.
Abstract:
An in-situ technique is provided for automatically verifying proper operation of a photometric device, such as a cell density probe (CDP). The CDP has a first detector and a second detector. The first detector senses light that is transmitted from a light source of the CDP. The second detector senses light that has passed through an optical gap at a tip of the CDP, wherein the sensed light has been reduced in intensity due to light absorption. Electrical current provided to the light source is reduced, and the resultant values of a light characteristic (such as intensity) are sensed. These values from the detectors are compared against one or more predicted values. If the CDP is operating properly, the values from the detectors will be consistent with the predicted values. If there is a malfunction in the CDP, then the values from the detectors will be inconsistent with the predicted values.
Abstract:
Described and claimed is a modular fluorometer and a method of using same to control an industrial water system, wherein said modular fluorometer comprises: one or more units with each unit comprising: a channel comprising an optically appropriate cell through which a water sample flows; a light source positioned outside said optically appropriate cell; an optional excitation filter positioned between the light source and the optically appropriate cell; a reference detector positioned outside the optically appropriate cell; an emission detector positioned outside the optically appropriate cell; an optional emission filter positioned between said emission detector and said optically appropriate cell; wherein if more than one unit is present in said modular fluorometer, said optically appropriate cells through which said water sample flows are aligned such that only one channel through which a water sample flows exists in said fluorometer.
Abstract:
The invention relates to an imaging system for optical automatic analysers, especially fluorescence readers. On the sample side, the imaging system contains a cylindrical lens array (6) and a prism array (7), which is arranged upstream of the cylindrical lens array. The prismatic effect of the prisms (7a-7c) of the prism array (7) lies in the direction of the cylinder axes of the cylindrical lenses (6a-6c). Together with a telescopic imaging system (8, 11), the inventive imaging system creates a number of parallel cylindrical focussing volumes between the cylindrical lens array (6) and a detector array (10), these focussing volumes being slanted towards the optical axis of the telescopic system in relation to the vertical. The arrangement enables the detection of fluorescence with a large aperture in one direction, and at the same time enables depth selective analysis of the fluorescence signal, especially the discrimination of the fluorescent radiation originating from the areas around the bases of the sample containers from the fluorescent radiation originating from the solution above. With the focussing volumes that are slanted towards the bases of the sample containers, the imaging system ensures that the fluorescence from the areas around the bases of the sample containers (5a-5c) is detected with the same sensitivity even when the heights of the bases vary in the individual sample containers.
Abstract:
The invention relates to an arrangement for continuous determination of a substance comprising a chemically reacting sensor element (21) arranged in or adjacent to a limiting wall of a volume (22) containing the substance, where in a housing (2) of a modular device (1) optical elements to read the sensor element (21) are arranged, comprising at least one light source (35) illuminating the sensor element (21) and at least one sample detector (29) detecting the light scattered by the sensor element (21), and where a front side of the housing (2) comprises a coupling for the sensor element (21) is arranged, so that the sensor element (21) may be interchangeably and modularly coupled to the front side of the housing (2). A glass body (24) is arranged adjacent to the coupling for direct contact with the sensor element (21) and separate conduits (34, 31) for the illuminating and for the scattered light are arranged rearward of the glass body (24). The modular device (1) allows for easily interchanging the modular sensor element (21) and provides an optical connection between the sensor element (21) and the detector (29) which is steady and allows for high quality measurements.
Abstract:
The invention concerns a method characterized in that it consists in front fluorescence spectroscopy measurement, said measurement being non-invasive and based on a light source projected on a specific meat zone, measuring the fluorescence spectrum emitted by the fluorophores of said examined zone, said spectrum being addressed in a spectrometer (5) connected to a computer (6) including a system for acquiring and mathematical processing of data, capable of processing said spectrum to deduce therefrom parameters representing the tenderness of the meat or the freshness of the fish, and the light energy exciting the fluorophores is established on a wavelength of 250 to 290 nm corresponding to the fluorophore exciting wavelength and in particular protein tryptophans, aromatic amino acids and nucleic acids.
Abstract:
A fluorescence fluctuation microscope, in which excitation light and detection light are coupled into or out of a microscope by means of a common beam path, comprises a closed loop scanning unit (22, 23).
Abstract:
Die Erfindung betrifft einen Reader für Mikrotiterplatten (1) und Substanzchips und enthält ein optisches System mit einem Linsenarray (2i, 7) und einem Teleskop aus normalen Linsen (41, 5, 42). Das Linsenarray ist austauschbar, so dass eine Adaption wahlweise für Absorptions-, Fluoreszenz- oder Lumineszenzmessungen möglich ist. Durch das Linsenarray ist eine Parallelmessung (ca. 100 Kanäle) möglich.