Gassecure As

Dräger Safety Ag&co. Kgaa

Knut Sandven

Hakon Sagberg

Ib-Rune Johansen

Håkon Sagberg

Jon Tschudi

Sigurd Teodor Moe

Niels Aakvaag

Niels Peter Ostbo

Britta Grennberg Fismen

Kari Anne Hestnes Bakke

Sigurd T Moe

Niels Peter Oestboe

Niels Peter ØStbØ

A gas sensor for measuring concentration of a predetermined gas includes a light source () arranged to emit pulses of light, a measurement volume (), a detector () arranged to receive light that has passed through the measurement volume (), and an adaptable filter () disposed between the light source () and the detector (). The gas sensor has a measurement state in which it passes at least one wavelength band which is absorbed by the gas and a reference state in which said wavelength band is attenuated relative to the measurement state. A controller is connected to each of the light source, the detector and the adaptable filter to change the adaptable filter between one of said measurement state and said reference state to the other at least once during a gas sensor operation period.

Gas sensors

A wireless sensor network comprises at least one sensor unit which comprises a sensor for sensing a parameter and at least one interrogating node. The interrogating node is arranged to transmit an interrogation message periodically to said sensor unit and to receive a reply message from said sensor unit. The sensor unit is arranged to transmit said reply message after a predetermined deliberate delay unless the sensor unit determines that an alarm condition has been met, in which case the sensor unit is arranged to transmit said reply message before the end of the deliberate delay.

Wireless sensor networks

To achieve gas detection in a precise and reliable way, but at the same time without consuming too much energy, a gas detection system is provided which generally comprises a pair of two different gas detectors. The first detector (D) is active continuously and sense substantially for an unspecific change in the local gas mixture. As a reaction upon the change, the second detector (D) of the pair is activated. This detector (D) performs the determination of the concentration of a specific gas or several specific gasses. The second detector (D) may be of a type which consumes more power, but will be active for a short period of time before returning to an inactive state where only the first detector (D) is active. The first detector (D) however is of a type using little power.

Detector system and method to detect or determine a specific gas within a gas mixture

Growing community of inventors

Oslo, Norway

Knut Sandven