Drãgerwerk Ag & Co, Kgaa

Robert Jahns

Livio Fornasiero

Ralf Buchtal

Hans-Ullrich Hansmann

Hartmut Stark

Peter Dreyer

Günter Steinert

Arne Tröllsch

Gerd Peter

Bernd-Michael Dicks

Tobias Heise

Heike Vöhringer

Björn Spilker

Martin Kroh

A measurement system () determines gas concentrations in a gas mixture of a gas sample by utilizing thermal conductivities and paramagnetic effects of thermal conductivities in the gas mixture involving data sets (). A circuit arrangement provides measured values with an AC signal component and with a DC signal component to a calculation and control unit (). An oxygen concentration in the gas mixture of the gas sample is determined based on the standardized AC signal components and a concentration of another gas in the gas mixture of the gas sample is determined based on the standardized DC voltage signal components. Output signals are generated by the calculation and control unit, which indicate the determined oxygen concentration and the determined concentration of another gas in the gas mixture of the gas sample.

Measuring system for determining gas concentrations

A photoacoustic sensor () is capable of detecting a predefined target gas in an area (Um). A process is capable of detecting the target gas with the use of such a sensor (). A sample chamber () holds a gas sample (Gp) to be tested. Electromagnetic waves (eW) from a radiation source () pass through the sample chamber () and the detection chamber (). The waves elicit in the detection chamber () an acoustic effect, which is measured by an acoustic sensor (). The acoustic effect is correlated with the concentration of the target gas in the sample chamber (). The detection chamber () is fluid-tightly sealed, is free from target gas and is filled with a replacement gas (Eg). The transmission of the replacement gas (Eg) has a spectral response similar to that of the transmission of the target gas in a predefined target gas wavelength range.

Photoacoustic sensor with replacement gas and detection process using such a sensor

A device analyzes an anesthesia ventilation gas with an infrared radiation source and includes a gas cuvette, a Fabry-Perot interferometer with a band pass filter function, adjustable with respect to a central transmission wavelength as a function of a control signal, a detector providing a measured signal and a computing and control unit providing the control signal and detecting the measured signal. The computing and control unit is configured to actuate the Fabry-Perot interferometer in a first operating mode by the control signal such that the central transmission wavelength scans a predefined wavelength range, to detect a presence in the ventilation gas sample potential types of anesthetic gases based on the measured signal. In a second operating mode, the control unit controls the central transmission wavelength within a subrange of the predefined wavelength range and determines a plurality of concentration values at consecutive times for detected types of anesthetic gases.

Device for the analysis of an anesthesia ventilation gas as well as anesthesia ventilator

A method for signal detection with a gas analysis system (') includes a radiation source (); a gas measuring section () containing gas to be measured; a Fabry-Perot interferometer (); a thermal sensor () configured to cause a change in voltage between electrodes with electromagnetic radiation falling thereon and arranged such that radiation released by a second interferometer mirror falls on the thermal sensor. The method includes irradiating the gas measuring section with radiation source radiation, continuously increasing or decreasing a distance of interferometer mirrors during a generating of time signal pulses at a constant period of time from one another. After a predefined number of time signal pulses, the voltage generated between the electrodes is detected and stored as a measured signal value. After a further predefined number of time signal pulses, the voltage generated between the electrodes is detected again and stored as a measured signal value.

Method for signal detection in a gas analysis system

Growing community of inventors

Herrnburg, Germany

Robert Jahns