Abstract: A gas analyzer for measuring at least two components of a gas is disclosed herein. The gas analyzer comprising an emitter configured to emit infrared radiation through the gas, a filter assembly configured to permit a transmission of predetermined wavelengths emitted by the emitter, and a detector configured to receive wavelengths emitted by the emitter and penetrated through the filter assembly. The filter assembly comprises at least two tunable narrowband interference filters in series, each of the filters comprising two dielectric mirrors and an air space between the two dielectric mirrors to tune one of the filters to different transmission band than another of the filters.

Abstract: A non-dispersive single beam detection assembly in an infrared gas analyzer. The detection assembly comprises radiation source(s) providing infrared radiation, a measuring chamber, and a physical beam splitter for dividing said radiation beam into a reflected beam portion and a transmitted beam portion, or for combining a reflected beam portion and a transmitted beam portion into said radiation beam. A measuring detector receives one beam portions, and a reference detector receives another beam portion. Alternatively a measuring/reference detector receives both beam portions. Said transmitted beam portion has a first spectral intensity peak at shorter wavelengths with a first peak wavelength, and said reflected beam portion has a second spectral intensity peak at longer wavelengths with a second peak wavelength.

Abstract: A liquid separation apparatus for removing a liquid from a respiratory gas is provided. The liquid separation apparatus comprises a housing that comprises an input, wherein a sample withdrawn from the respiratory gas is delivered through the input; a first output wherein at least part of the sample of the respiratory gas is discharged through the first output; and a first filter configured to remove the liquid from the sample of respiratory gas flowing through the input and the first output of the housing. The first filter comprises a hydrophobic property and an oleophobic property to remove the liquid when a surface tension of the liquid is lower than a surface tension of bodily fluids.

Abstract: A gas analyzer for measuring at least two components of a gas is disclosed herein. The gas analyzer comprising an emitter configured to emit infrared radiation through the gas, a filter assembly configured to permit a transmission of predetermined wavelengths emitted by the emitter, and a detector configured to receive wavelengths emitted by the emitter and penetrated through the filter assembly. The filter assembly comprises at least two tunable narrowband interference filters in series, each of the filters comprising two dielectric mirrors and an air space between the two dielectric mirrors to tune one of the filters to different transmission band than another of the filters.

Abstract: A fluid connection for reducing a volume in this connection is disclosed herein. The connection includes a first connector having a first body encircling a first bore, the first body having a first sealing surface (and a second connector having a second body encircling a second bore, the second body having a second sealing surface to form a tight connection with the first sealing surface. The connection also includes a volume between the first and second connector and a protrusion in one of the first and second body. The connection further includes a cavity in a remaining one of the first and second body and which cavity is receiving the protrusion separating the volume into a first volume and a second volume, which is at a distance from the first volume.

Abstract: A thermopile sensor for detecting infrared radiation arriving in an axial entering direction. The thermopile sensor comprises a metal housing that has a base section and a mantle section, a cavity between said mantle section and said base section, an opening in said mantle section opposite said base section for entering of said infrared radiation, thermopile chip on a top surface of the base section, electrical connectors connected to said thermopile chip(s) and which extending through said metal, and a radiation transparent window. Said thermopile sensor is a miniature sensor construction, in which said cavity has an inner dimension adapted for at least one thermopile chip. Said base section has an outer base dimension and a base thickness forming the first part of a thermal mass, and said mantle section extends with a length from said base section and has a wall thickness around said opening forming a second part of said thermal mass, which surrounds said thermopile chip.

Abstract: A non-dispersive single beam detection assembly in an infrared gas analyzer. The detection assembly comprises radiation source(s) providing infrared radiation, a measuring chamber, and a physical beam splitter for dividing said radiation beam into a reflected beam portion and a transmitted beam portion, or for combining a reflected beam portion and a transmitted beam portion into said radiation beam. A measuring detector receives one beam portions, and a reference detector receives another beam portion. Alternatively a measuring/reference detector receives both beam portions. Said transmitted beam portion has a first spectral intensity peak at shorter wavelengths with a first peak wavelength, and said reflected beam portion has a second spectral intensity peak at longer wavelengths with a second peak wavelength.

Abstract: An arrangement for supervising a medical monitor. The arrangement for supervising the medical monitor comprises a measurement function having at least one measurement device to make at least one measurement for obtaining measurement information for monitoring one or more patient care signals. The arrangement for supervising the medical monitor also includes a supervision analyzer configured to communicate with the measuring function and to receive the measurement information. The supervision analyzer is adapted to obtain reference information and to compare the measurement information to the reference information to determine whether the measurement function is working properly.

Abstract: The invention relates to an additional feature for use in a measuring sensor which is used for analyzing mediums spectroscopically. The measuring sensor comprises: a radiation source (1), emitting radiation which travels through a first window (3a) of a sample chamber (2), an absorption length (L1) and further a second window (3b) of the sample chamber (2), the sample chamber being provided, if necessary, with flow connections for a gas mixture; at least done detector (9), which is optically directed towards the second window; at least one optical filter (8), which is permeable to a certain wavelength band, or a radiation dispersion device between the radiation source and the detector. Between the first sample chamber window and the radiation source, the feature comprises a length (L2) and/or, between the second window and the detector, a length (L3), totalling at least about 20% of the absorption length.

Abstract: A measuring device for determining the concentration of such gas components from a gas mixture, which includes collision dilation of the absorption lines constituting the absorption spectral bands for measuring objects. The device comprises a non-dispersive concentration measuring sensor (20), which includes: a measuring chamber (6) containing a gas mixture to be analyzed; a radiation source (17) for emitting over a wavelength range which includes an absorption spectral band used in concentration determination; a detector (18) receiving radiation that has passed through the measuring chamber and for producing a first signal (7) therefrom; as well as an optical bandpass filter (16) positioned between the detector and the radiation source. The measuring device further comprises a second measuring sensor (4) for identifying the viscosity or some other viscosity-related feature of a gas mixture to be analyzed and for producing a second signal (9).

Abstract: The invention relates to a method and apparatus for determining the concentration of at least carbon dioxide in a gas mixture on the basis of the absorption of infrared radiation (2), said apparatus comprising: a radiation source (1), the radiation emitted thereby being aligned to travel through a measuring cell (4) containing a gas mixture (6) to be analyzed; an optical band-pass filter (10), which is transmissive to a first wavelength band and positioned on the path of radiation emerging from the measuring cell or entering into the measuring cell through which the radiation passes; and a first detector (14), positioned in the radiating direction downstream of said first band-pass filter and used for detecting the radiation intensity falling thereon. Said optical band-pass filter (10) has a band-pass which lies within the wavelength range of 4.38 .mu.m-4.47 .mu.m for measuring the total concentration of carbon dioxide by means of the absorption spectrum of a molecule .sup.13 CO.sub.

Abstract: A method of non-dispersive analysis of gas mixtures for determining the concentration of some gas component therein.

Abstract: An apparatus for determining the alcohol concentration in a gas mixture, which may contain a number of such interference components that have substantial absorption within the range of the alcohol absorption line to be presently determined, by means of a method based on the absorption of infrared radiation. The apparatus comprises: a radiation source (1); a chamber (4) for receiving a gas mixture (6) to be measured, said chamber being provided with windows (7a, 7b) whereby a radiation (2) passes through the gas mixture; a detector (13) which receives the radiation having passed through the gas mixture and transforms it to an electric state for further processing; between the radiation source and the detector an optical interference filter (10), which has a narrow radiation transmission band and which is pivotable (P) relative to the main traveling direction of radiation for changing the wavelength range of the filter's transmission band.

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.