Schlumberger Industries, Sa

Schlumberger Resource Management Services, Inc.

Fran&ccedil;ois Grasdepot

Didier Dominguez

The spectral absorption of a body, placed between a source for emitting electromagnetic radiation and a detector for detecting the radiation, is measured. The technique includes emitting the electromagnetic radiation in a determined spectral range towards the body, filtering the electromagnetic radiation, and detecting the electromagnetic radiation attenuated by the absorption due to the body and deducing therefrom a measure of the spectral absorption of the body. The filtering and detection steps are implemented by a detector of the quantum type. The technique also applies to determining the calorific value of a gas, for measuring the energy of electromagnetic radiation, and an apparatus for implementing the technique.

Method for measuring spectral absorption in a body and device therefor

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.

Growing community of inventors

Fontenay aux Roses, France

François Grasdepot

Growing community of inventors

Fontenay aux Roses, France

Fran&ccedil;ois Grasdepot

François Grasdepot