Sensirion Ag

Nicolas Moeller

Mark Hornung

Lukas Bürgi

Matthias Streiff

Andreas Rüegg

Stefan Thiele

Stefan Kostner

David Kiliani

Matthias Merz

Matthias Studer

Cyrill Kuemin

Martina Hitzbleck

Lukas Buergi

Raffaele Di Giacomo

Michael Merz

Patrick Leidenberger

A thermal sensor device serves for determining a concentration of a target gas in a gas sample that further comprises a disturbance gas. The thermal sensor device comprises first and second measurement structures () comprising first and second temperature sensors (TS, TS) and a heater element () operable to cause heat transfer to the measurement structures through the gas sample. Processing circuitry provides heating power (P_) to the heater element and derives an output signal (S) based on a response of the temperature sensors to the heating power, the output signal being indicative of a concentration of the target gas in the gas sample. The first and second measurement structures have different heat dissipation capabilities, and the processing circuitry derives the output signal from a weighted difference of temperature signals from the first and second temperature sensors. Thereby, a cross-sensitivity of the output signal to a concentration change of the disturbance gas may be reduced or eliminated.

Thermal sensor device and method for determining a concentration of a target gas in a gas sample

A duct probe () for sampling a fluid from a main fluid flow (Fm) in a duct () defines an elongated supply channel () n elongated discharge channel (). The supply channel has at least one inflow opening () for diverting a partial flow (Fp) from the main fluid flow into the supply channel, and the discharge channel has at least one outflow opening for returning the partial flow from the discharge channel into the main fluid flow after it has passed an environmental sensor (). The duct probe further comprises at least one compensation opening () that connects the supply channel and the discharge channel in a region that is located between their closed and open ends. By the presence of the compensation opening (), a jet flow (Fj) is created, which acts to reduce a pressure difference between the supply channel and the discharge channel when the duct probe is exposed to the main fluid flow (Fm).

Duct sensor with duct probe for sampling a fluid from a duct and method of operation

The present invention relates to a sensor () for sensing organic carbon in a liquid (L), comprising: a container () having an interior space () for receiving the liquid (L), a photodetector (), and a light source () configured to emit ultraviolet light () so that the ultraviolet light () travels along an optical path (P) through liquid (L) residing in the interior space () and is absorbable by carbon bonds of organic molecules in the liquid (L). According to the present invention, the photodetector () is configured to detect light in the visible or infrared spectrum, and the sensor () comprises a down conversion material portion () arranged in the optical path, wherein the down conversion material portion () is configured to receive incoming ultraviolet light () emitted by the light source () and to down convert received ultraviolet light () and to emit said down converted light () in the visible or infrared spectrum so that emitted down converted light () impinges on the photodetector ().

Total organic carbon sensor utilizing down conversion

The sensor device comprises a hotplate on a membrane. The hotplate is heated by a N-fold rotationally symmetric heater structure having N&#x3e;1 heater elements of identical design. Each heater element comprises an inner section, an intermediate section and an outer section arranged in series, with the inner section having a larger electrical cross section than the outer section. This design allows to heat the hotplate to a homogeneous temperature at moderate supply voltages.

Heater structure for a sensor device

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Stäfa, Switzerland

Nicolas Moeller