Schlumberger Industries, Sa

Westerngeco L.l.p.

Didier Dominguez

Jacques J Orban

Benoit G Froelich

Irene Gabler

Fran&ccedil;ois Grasdepot

Seismic sensor

The invention concerns a device ( ) for measuring calorific energy contained in a fuel gas transported in a pipe ( ) comprising a gas meter ( ) measuring a volume V in pressure conditions P and temperature conditions T of a gas circulating in said pipe and an apparatus ( ) to determine the gas calorific power H. The invention is characterized in that said apparatus for determining calorific power measures at least one physical variable proportional to the number of molecules of the gas different constituents in a given volume and is placed as near as possible to the gas meter so as to determine the calorific power H(P,T) in similar pressure P and temperature T conditions as those wherein the gas volume V(P,T) is measured, said device then determining the calorific energy H(P,T) V(P,T) contained in the gas.

Device and method for directly measuring calorific energy contained in a fuel gas

The invention concerns a method for wavelength calibration of an electromagnetic radiation filtering device ( ) included in an apparatus ( ) measuring spectral transmission of a propagating medium external to said apparatus and wherein said radiation flows through, said filtering device having spectral transmission tuneable on a wavelength range based on the value of a physical parameter. The invention is characterized in that it consists in: selecting at least one absorbing gaseous line which is always present in natural form in the propagation medium and whereof the corresponding wavelength is included in said filtering device tunability wavelength range; and in calibrating the filtering device with respect to said at least one absorbing gaseous line which is used as natural reference.

Method for wavelength calibration of an electromagnetic radiation filtering device

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Oslo, Norway

Didier Dominguez