摘要:
An optical-fiber-based spectrometer utilizes a compact, P-C-board-mountable optical multiplexer which permits multiple channels of reference and measurement data from remote and hostile environments to be analyzed in rapid sequence utilizing synchronized computer data-storage and comparison to give rapid-fire answers to the question of the presence or absence of species of interest in a sample or process being analyzed, the relative light level in the reference and data channels being balanced by an optical attenuator having only an air path, attenuation being effected by controlled misalignment of optical fiber ends.
摘要:
A device and a method for measuring a concentration of at least one component of a process gas by means of a laser is provided. The beam path of the laser penetrates a volume containing the process gas. 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 and is used for measuring the concentration by means of laser spectroscopy, exactly one absorption line being determined for said measurement.
摘要:
A spectrometer system is disclosed in which the sample-containing chamber is a separately constructed, enclosed modular unit which is readily attachable to, and detachable from, one wall of a housing which constitutes the basic unit of the spectrometer, and which contains an interferometer, one or more detectors, and other portions of the system. Various examples of the essentially unlimited types of sampling modules are disclosed. Also, automatic sample loading and unloading devices are disclosed, which are feasible because of the modular construction. And means of loading and unloading samples without purge loss are disclosed, which are feasible because of the modular construction.
摘要:
An apparatus and method for the measurement of wax appearance temperature and wax disappearance temperature. The apparatus includes the following. The sample receptacle having a receptacle opening, including a bottom, at least one side and an open top. The sample receptacle including an inlet and an outlet for sample insertion and removal. The at least one side about the receptacle opening being light absorbing. The sample receptacle including a transparent cover mounted over the open top. The bottom of the receptacle opening having a reflective upper surface. A thermo device temperature change of the sample. A thermometer to register current temperature of the sample. A viewing chamber above the transparent cover, where the viewing chamber is surrounded by material that is light absorbing. A light emitting device to project light through the viewing chamber and the transparent cover.
摘要:
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.
摘要:
A method of monitoring the surface of a sample under test is provided and the method comprises the steps of: illuminating the surface with light (20) polarised in a first direction; viewing light reflected from the surface through a polarising filter (27) arranged at 90° to the first direction, wherein the surface of the sample under test is provided with a marked area where diffuse reflection of the incident polarised light will occur in order to improve the contrast between the marked area and the surface of the sample under text.
摘要:
A method through which a more rapid detection of Helicobacter pylori in a gaseous sample is practicable, in which the 13C content is measured only until a minimum number of measurement values of the 13C content meets a standard deviation to be specified. The known 13C urea breath test has become established for clinical diagnosis for detecting Helicobacter pylori infections and known methods for detecting Helicobacter pylori provide that each method step corresponds to a fixed, specified time, which is disadvantageous, especially for performing a large number of such tests.
摘要:
A sample analysis cup assembly, system and method for purging including a cell body, including a top end; a bottom end; a cell body wall extending axially from the top end to the bottom end; a transverse wall adjacent the top end, including a plurality of apertures extending therethrough; and a raised portion on the transverse wall including a central aperture extending therethrough; a rotatable cap, including a top surface; a bottom surface; and a series of apertures extending from the top surface through the bottom surface, the rotatable cap being structured to engage with the top end of the cell body; and a ring member structured to couple with the bottom end of the cell body are provided.
摘要:
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.
摘要:
To provide a light source which realizes accurate determination of the particle density of a plasma atmosphere without disturbing the state of the plasma atmosphere.The light source of the invention includes a tubular casing 12; a cooling medium passage 30 for causing a cooling medium to flow therethrough, the passage being provided along the inner wall of the casing; a lens 50 provided at a tip end of the casing; a first electrode 44 and a second electrode 45 which are provided in the casing and before the lens so as to be vertical to the axis of the casing and parallel to each other; and an insulating spacer 46 provided between the first electrode and the second electrode. The light source further includes a hole 47 axially penetrating the center portions of the first electrode, the insulating spacer, and the second electrode; and an electric discharge gas passage for introducing an electric discharge gas, along the inner wall of the cooling medium passage, to the back surface of the lens so that the electric discharge gas is reflected by thepslens and flows through the hole.