Abstract: Gas sensor capable for in-situ non-contact optical measurements of hydrogen gas (H2) and method for measuring hydrogen gas under ambient and elevated pressures without the need for cells with extremely long optical path length. The gas sensor can be configured for dual gas measurements such as H2 and CO2.

Abstract: Gas sensor capable for in-situ non-contact optical measurements of hydrogen gas (H2) and method for measuring hydrogen gas under ambient and elevated pressures without the need for cells with extremely long optical path length. The gas sensor can be configured for dual gas measurements such as H2 and CO2.

Abstract: Gas detection or monitoring apparatus mainly comprising, an optical source unit including a tunable diode laser, an optical detection unit including a light sensitive detector, the source and the detector being arranged so that light from the source propagates through a gas measurement volume prior to being received by the detector, and the source being adapted to scan the light wavelength across one or more expected absorption lines of gases in the measurement volume, a control and processing unit for control and modulation of the source and processing of the detected signal and for calculating at least one digital value representing (a) gas concentrations in the gas measurement volume, wherein said control and processing unit is coupled to the source via a digital-to-analogue (D/A) converter, and the detector output signal is coupled to the input of an analogue-to-digital (A/D) converter, and the output of the A/D converter is coupled to the processing unit.