Dragerwerk Aktiengesellschaft

Drager Medical Gmbh

Dr&auml;ger Medizintechnik Gmbh

Dragerwerk Artiengesellschaft

Horst-Dieter Hattendorff

Jochim Koch

Hans Matthiessen

Peter Dreyer

Ludger Tappehorn

Bernd-Michael Dicks

Dieter Weismann

Jennifer Lünse

Petrus Stephanus Van Zyl

Chritiane Göbel

Georg Ankerhold

Regina Best

Eberhart Liesching

Bernd Grabbet

Tobias Winkler

Christiane Brandt

A measurement gas vessel () for the measurement of the concentration of gas components of a stream of breath from a patient has a thin-walled inner part () which has two opposite facing walls limiting the breath stream. The walls are transparent to infrared light. An outer part () which in the central region () has two recesses on opposite sides which, with the walls () of the inner part (), each form a window (). A region of the inner part () outside the windows () is thermally connected to the outer part (), and the outer part () surrounds the inner part ().

Measuring gas sample holder for measuring the concentrations of gas components and process for manufacturing a measuring gas sample holder

The invention relates to an apparatus and a method for improved correction of drift in an infrared measuring instrument. The measurement signal furnished by a thermal detector is split into a direct voltage component and an alternating voltage component. By means of calibration curves (), a calculated comparison variable is formed from a measured, averaged concentration value The correction value &#x394;T for the drift correction is obtained from the difference between the corresponding measured size of the direct voltage component and the comparison variable 

Apparatus and method for determining the proportion of a substance in a gas sample using an infrared measuring instrument

A process is provided for determining the functional residual capacity (FRC) of the lungs during respiration. An environmentally friendly trace gas is used in a process and system for determining the FRC by using fluoropropanes as a trace gas. Values for the FRC can thus be calculated, resolved for individual breaths, from the expiratory trace gas concentration and the expired breathing gas volume and they can be used for determining the FRC depending on their convergence behavior.

Process for determining the functional residual capacity of the lungs

A measuring device for determining the concentration of gases with two identical radiation sources and two radiation detectors, which delivers stable measured values despite the contamination that occurs or the shielding from radiation of the outer optical surfaces exposed to the gases or to mixtures of gases and despite possible mechanical disadjustments. The two radiation detectors are provided with an optical concentrator each for bundling the radiation, and being arranged in a gas-tight housing together with the two identical radiation sources and with a beam splitter. One radiation source is directed through a window that is transparent to infrared light to a plane mirror outside the gas-tight housing, and the beam path reflected by the plane mirror falls through the window that is transparent to infrared light onto the beam splitter. The beam splitter splits both the radiation of the first radiation source reflected by the plane mirror and that of the second radiation source between two radiation detectors. The first radiation detector is used as a measuring detector and the second radiation detector is used as a reference detector.

Infrared absorption measuring device

The invention is directed to a sensor arrangement for optically measuring the components of a gas. The sensor arrangement includes a housing containing a transmitter, a receiver device, a heatable holder for a measuring cuvette and optical devices for establishing the beam path. The sensor arrangement is improved by limiting the heating of the cuvette walls to those areas which lie in the beam path without the pass-through area of the optical devices being narrowed by the heating device. Also, the cuvette walls are heated in the manner described above without electrical contacts being disposed on the cuvette or on the sensor. The heatable cuvette holder includes one window disposed in the beam path which is transmissive for the measuring radiation. When the cuvette is seated in the cuvette holder, this window lies in virtual contact engagement with the cuvette and has a surface facing away from the cuvette. The heating device is applied to this surface of the window and is configured to allow the beam to pass therethrough.

Sensor arrangement for optically measuring gas components

Growing community of inventors

Bad Schwartau, Germany

Horst-Dieter Hattendorff