Abstract:
A gas sample chamber (10) for use in a gas analyzer consists of an elongated hollow tube (21) having an inwardly-facing specularly-reflective surface (22) that permits the tube to function also as a light pipe for conducting radiation from a source (20) to a detector (16) through the sample gas. A number of apertures (24) in the wall of the elongated hollow tube permit the sample gas to enter and exit. Particles of smoke and dust of a size greater than 0.1 micron are kept out of the chamber by use of a semi-permeable membrane (28) that spans the apertures in the hollow tube. Condensation of the sample gas components is prevented by heating the sample chamber electrically to a temperature above the dew point of the component of concern.
Abstract:
A light source and a method for its use in an optical sensor are provided, the light source including a resistively heated element. The light source includes a power circuit configured to provide a pulse width modulated voltage to the resistively heated element, the pulse width modulated voltage including: a duty cycle with a first voltage; and a pulse period including a period with a second voltage, wherein: the duty cycle, the first voltage, and the pulse period are selected so that the resistively heated element is heated to a first temperature; and the first temperature is selected to emit black body radiation in a continuum spectral range. Also provided is an optical sensor for determining a chemical composition including a light source as above.
Abstract:
The present invention concerns an apparatus for radiometric measurement of thin fluid films. It has a housing (1) enclosing means of radiation, a radiation guide, a reflector (4) and one or more detectors (5). The means of radiation is normally an IR radiator (2). The radiation guide is either a radiation tube (3) or a radiation cone (7). The reflector (4) is of the type non-imagining optics. If there is more than one detector (5) normally at least one detector is a reference detector.
Abstract:
A miniature source of modulated infra-red energy comprises a very thin heated wire strip (11) of low mass, mounted in a tensioned state by means of two resilient members (18), and a reflector (15) positioned behind the wire (11) so as to enhance the radiated energy. The source is hermetically sealed in an inert atmosphere with a cap (20). The cap (20) has an aperture (16) through which the energy emerges, this is sealed either with a window or a filter (17) if a specific wavelength is desired.
Abstract:
Dispositif de détection infrarouge comportant un dispositif de détection de gaz (114, 116) comprenant : - une couche résistive (25) dont une première portion (25a) est apte à réaliser une émission d'un rayonnement infrarouge apte à être absorbé par le gaz à détecter, et dont une deuxième portion (25b) est couplée thermiquement à un premier élément (28b) de transduction thermorésistive dudit rayonnement infrarouge ; - un substrat (109) comportant un circuit électronique (110, 1104, 1106) de commande et de lecture du dispositif de détection de gaz ; - des portions de matériau électriquement conducteur (26) reliant électriquement la première portion et le premier élément transducteur thermorésistif au circuit électronique, et assurant un maintien mécanique de la première et de la deuxième portions en regard du substrat tel qu'une distance entre la première portion et le substrat soit sensiblement égale à une distance entre la deuxième portion et le substrat.
Abstract:
An infrared radiator arrangement for a gas analysis device consists of a radiator housing, in the interior of which a ceramic body (3) in the form of a plate is arranged, said interior being closed on one side with a radiation-transmissive window, and a heating resistance layer (4) being applied to said ceramic body. In order to ensure that the ceramic body (3) is mounted in a reliable and exactly defined manner, the ceramic body is in the form of an equilateral triangular plate (5) which is mounted, by the triangle points (6) thereof, on the inner circumference of the radiator housing (1), preferably in a circumferential groove (7).
Abstract:
The present invention concerns an apparatus for radiometric measurement of thin fluid films. It has a housing (1) enclosing means of radiation, a radiation guide, a reflector (4) and one or more detectors (5). The means of radiation is normally an IR radiator (2). The radiation guide is either a radiation tube (3) or a radiation cone (7). The reflector (4) is of the type non-imagining optics. If there is more than one detector (5) normally at least one detector is a reference detector.