Abstract:
A probe for an IR or UV sensor comprising a light emitter and detector is described comprising a lens. The detector detects the spectrums of the emitted light after it has passed a gas to be measured. The sensor of the present invention is especially suitable for such as harsh or aggressive environments measuring the exhaust gasses, for example in ships, vehicles, chimneys etc., and comprises purge gas protections for delicate optical parts to prevent particles etc. from the exhaust gas depositing on the optics. The sensor further has a flow of sample gas from the gas to be measured being adapted to prevent the purge gas from inferring with the measurements.
Abstract:
The invention relates to a device and a method for measuring a concentration of at least one component of a process gas by means of a laser (2a), the beam path of the laser (2a) penetrating a volume (1) containing the process gas. The invention is characterized by the fact that one section of the beam path penetrates the process gas in a free manner while another section thereof is shielded from the process gas. Only the section of the beam path, which penetrates the process gas in a free manner, is designated as the section to be measured (4) and is used for measuring the concentration by means of laser spectroscopy, exactly one absorption line being determined for said measurement.
Abstract:
Test apparatus comprising means for holding a sample to be tested, means for altering the strain in the sample, an optical arrangement for monitoring the sample to be tested, and processing means for processing the signals resulting from the monitoring of the sample under test, wherein the environment between the optical arrangement and the sample under test is controlled, and wherein the sample to be tested is located in a position external to the controlled environment.
Abstract:
A continuous analyser comprises a spectrometer (2), suitably an NIR spectrometer, and a computer for automatic data processing, for operation in a classified safety area. The spectrometer (2), the central processing unit (3) of the computer, the video monitor (4) and the keyboard are enclosed in a leakproof pressurised cabinet (1) which also contains an air conditioner (9), the condenser (10) of which is located outside the cabinet (1). Purging of the atmosphere initally contained in the cabinet (1), the pressurisation of the cabinet (1) and the subsequent maintenance of this pressure are controlled by a pneumatic logic controller (13). This operates a purging phase during which the pneumatic logic controller (13) checks the escape of the minimum flow through an output module (16) for a specific time before permitting connection of the electrical equipment (2,3,4). This is followed by a pressure maintenance phase during which a desired pressure is maintained inside the cabinet (1) without appreciable escape through the output module (16).
Abstract:
The invention is directed to a nephelometric turbidimeter (10) for measuring a turbidity of a liquid sample (13) in a transparent sample cuvette (12), the turbidimeter (10) comprising a cuvette chamber (16) defined by a cuvette chamber housing (14) wherein the sample cuvette (12) is arranged, and a drying apparatus comprising : a cuvette chamber inlet opening (38) for venting the cuvette chamber (16) and a cuvette chamber outlet opening (42) for deventing the cuvette chamber (16), an air circulator (49) for pumping air from the outlet opening (42) to the inlet opening (38), and a drying body (32) arranged in the drying path between the outlet opening (42) and the Inlet opening (38). This arrangement allows to actively and dynamically control the air humidity within the cuvette chamber (16).
Abstract:
A method and system for measuring sample characteristics using a broadband metrology tool in a purge gas flow environment are disclosed. A beam path for the tool is purged with gas at a first flow rate. The sample surface is illuminated by source radiation having a vacuum ultraviolet (VUV) and/or ultraviolet-visible (UV-Vis) component. The gas flow rate is adjusted between the first flow rate for measurements made with VUV radiation and a second flow rate for measurements made UV-Vis radiation. The system includes a light source, illumination optics, collection optics, detector, gas source and a controller. The gas source can supply gas to a beam path in the light source and/or illumination optics and/or sample and/or collection optics and/or detector. The controller can control a flow rate of the gas in response to an output signal from the detector.
Abstract:
The invention relates to a method for controlling flat glass forming by flowing a molten glass over a liquid tin layer contained in a forming vat wherein a forming characteristic quantity is measured above the glass surface during forming by means of beams generated by at least one absorption spectroscopy-based analyser, wherein the light beams generated by said analyser form a net above the glass surface. A device for carrying out the inventive method comprising an arm for supporting a vessel which comprises a retroreflecting means for receiving a light beam and transmitting it in an opposite direction parallel to an incident optical path is also disclosed.
Abstract:
Der 13 C-Harnstoff-Atemtest hat sich zum Nachweis von Helicobacter Pylori Infektionen für die klinische Diagnostik etabliert. Bekannte Verfahren zum Nachweis von Helicobacter Pylori sehen es vor, dass jeder Verfahrensschritt einer festen, vorgegebenen Zeit entspricht. Dies gestaltet sich jedoch, insbesondere für die Durchführung einer großen Anzahl derartiger Untersuchungen als unvorteilhaft. Der Erfindung sieht es daher vor, ein Verfahren zu schaffen, durch das ein schneller Nachweis von Helicobacter Pylori in einer gasförmigen Probe realisierbar ist. Erfindungsgemäß wird der 13 C-Gehalts nur so lange gemessen, bis eine Mindestanzahl von Messwerten des 13 C-Gehalts einer vorzugebenden Standardabweichung genügt.