Abstract:
A radiation source assembly for optical transducers used for the analysis of material components of media, whereby the radiation source assembly comprises: two thermal radiation sources (1, 2), of which the first radiation source (1) is located, in relation to the second radiation source, in such a position that it emits through the second radiation source (2); a band-stop filter (10) located between the first and the second radiation sources, so that the radiation (6) emitted by the first radiation source passes through it. Both thermal radiation sources (1, 2) comprise a substrate (3, 11) made of silicon, of a silicon mixture or of a silicon compound, and a recess (53) made in the substrate, and micro-filaments (4, 5), which are fastened at their ends to the outer surface (51, 52) of the substrate, their radiation (6, 8) emitting regions being at a distance (H) from the bottom surface (54) of the recess. The stop band of the band-stop filter (10) substantially corresponds to the absorption distribution of the material component of the medium to be analyzed with the transducer.
Abstract:
The application relates to an infrared radiation source for a gas analyzer and a method for generating infrared radiation. The infrared radiation source comprises a body (6), thermal insulation material (5) adapted inside the body (6), a radiant element (1) fitted inside the insulation material (5), elements (2, 3) for feeding electric energy to said radiant element (1), and a channel (7) formed in said body (6) and said thermal insulation material (5) in order to pass the radiation generated by said radiant element (1) to the gas under measurement. According to the description, at least the thermal insulation material (5) adapted in close proximity to the radiant element (1) has a low thermal conductivity and the emissivity of the radiant surface (11) adapted in close proximity to the radiant element (1) is greater than 0.5 at the operating temperature of the source.
Abstract:
Die Erfindung beschreibt einen Apparat und ein Verfahren, mit dem Detektoren zur Erkennung der Anwesenheit gefährlicher Konzentrationen von z. B. Methan hergestellt werden können. Das Verfahren gewährleistet einen selektiven Nachweis und basiert auf der Eigenschaft mehratomiger Gase, Lichtquanten mit Energien im Infrarot-Bereich zu absorbieren, wobei die Signalauswertung insbesondere die Verteilung der Signale auf der Zeitachse zur Erkennung gefährlicher Konzentrationen ausgenutzt wird.
Abstract:
The present invention relates to an apparatus and method for measuring the concentration of a gas. Said apparatus comprises a radiation source (70) for emitting radiation onto the gas (79) to be measured, whereby said radiation source (70) is comprised of an anode (4) and a cathode (9), and as an emitting fill gas the same gas as the gas (79) to be measured; and a radiation detector (74) with which the radiation transmitted through the gas (79) to be measured can be detected. According to the invention the cathode (9) functions as an electron emitter, and between said anode (4) and said cathode is connected such a low operating voltage that does not cause ionization or essential dissociation of the emitting gas. The design according to the invention provides an approximate temperature tracking of the radiation source with the ambient temperature.
Abstract:
A novel structure for a small, inexpensive, and easily replaced infrared source having near blackbody emission over a spectrum of 2-20 micron wavelengths is disclosed. The source element is self-starting and has a life expectancy in excess of 1000 hours at 1700 degrees K, which requires only 22 watts of power to maintain. Because the source is energy efficient, there is no need of auxilliary cooling or added thermal isolation from adjacent components when the source is used in an instrument such as a spectrophotometer.
Abstract:
Agencement de source de radiation infrarouge, notamment pour une utilisation dans l'analyse spectrale infrarouge. On applique à un substrat électriquement isolant (2) un et de préférence au moins deux films séparés électriquement conducteurs (2a, 2b) adaptés à être chauffés par l'application d'un courant électrique dépendant du temps. Deux ou plusieurs films peuvent former un groupe de radiations (réseau) dans lequel chaque film (2a, 2b) est adapté à être mis sous tension séparément avec un courant électrique provenant d'un circuit électrique d'attaque (1) et permettant d'appliquer au film ou films un courant électrique dépendant du temps, de préférence sous forme d'impulsion, de sorte que des impulsions de radiation infrarouge sont émises. Le courant électrique est commandé dans le temps afin de pouvoir distinguer l'une de l'autre dans un détecteur (6) les impulsions de radiation provenant des films respectifs. L'épaisseur du substrat et la conductivité thermique, la chaleur et la densité spécifiques du matériau de substrat sont choisies de manière à adapter la constante de temps thermique à la gamme de fréquence d'impulsion du circuit d'attaque.