Dual source auto-correction in distributed temperature systems

Details Dual source auto-correction in distributed temperature systems Dual source auto-correction in distributed temperature systems

G - Physics

01

K

G01K 11/12 (2006.01)

Patent

CA 2692804

An automatic and continuous method is presented to improve the accuracy of fiber optic distributed temperature measurements derived from Raman back scatterings utilizing two light sources with different wavelengths, by choosing the wavelengths of the two sources so the primary source's return anti-Stokes component overlaps with the incident wavelength of the secondary light source thereby canceling out the non- identical attenuations generated by the wavelength differences between Stokes and anti-Stokes bands.

L'invention concerne un procédé automatique et continu destiné à améliorer la précision de mesures de températures réparties par fibre optique issues de rétrodiffusions Raman, mettant en uvre deux sources de lumière présentant des longueurs d'onde différentes, la longueur d'onde des deux sources étant sélectionnée de sorte que la composante anti-Stokes de retour de source primaire empiète sur la longueur d'onde incidente de la source de lumière secondaire, ce qui permet d'annuler les atténuations non identiques générées par les différences de longueurs d'onde entre les bandes Stokes et anti-Stokes.

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