Jobin Yvon Sas

Jovin Yvon S.a.s.

Alain Le Marchand

Emmanuel Fretel

Christophe Pecheyran

The invention relates to a method and a device for obtaining a low-noise optical signal. According to the method, a luminous beam is injected through two apertures and after detection respectively a basic optical signal () and a corrective optical signal () are generated. Both optical signals obtained () are subtracted, so that a resulting optical signal is generated, forming the low-noise optical signal. The apertures are preferably two slits of a spectroscope, the optical signals being expressible relative to the wavelength.

Method and device for obtaining a low-noise optical signal

This invention concerns a plasma source emission spectrometer to measure a sample comprising an excitation source () having a central axis () and producing a plasma, an extraction enclosure () receiving a beam composed of ions, atoms and electrons () derived from the plasma and comprising an optical lens () collecting luminous radiations emitted by the ion beam (). According to the invention, the lens () is not exposed directly to the plasma. The invention also concerns a sighting device () comprising a metallic structure (), substantially cylindrical having a first () and second () faces ranging respectively in a first () and second () planes. The first face () comprises an input aperture () for a beam () to be analysed and the second face () comprises an output aperture () for said beam (). The first plane () forms an angle &#x3b1; with the normal of the second plane ().

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Le Mesnil Saint Denis, France

Alain Le Marchand