Process for producing scintillating optical fibres and...

Details Process for producing scintillating optical fibres and... Process for producing scintillating optical fibres and...

B - Operations, Transporting

29

D

18/103, 88/97

B29D 11/00 (2006.01) C09K 11/06 (2006.01) G02B 6/02 (2006.01)

Patent

CA 2020465

A process for producing scintillating optical fibres consisting in dissolving in a monomer having aromatic cycles, in particular vinyltoluene or styrene, 1-phenyl-3-mesityl-2-pyrazolin (PMP) doping molecules and a chain transfer agent, especially glycoldimercapto acetate, in heating the mixture so as to cause it to polymerize and to effect the final sheathing and stretching of the polymer so as to produce the optical fibres. The process of the invention enables fibres to be obtained which have a very small diameter (in the region of 30 to 50 microns) with a reduced molar extinction in a proportion exceeding 100 in relation to conventional scintillating fibres; it also totally suppresses diaphotic phenomena when the fibres are arranged to form a beam.

2020465 9008644 PCTABS00101 L'invention concerne un procédé de fabrication de fibres optiques scintillantes consistant à dissoudre dans un monomère possédant des cycles aromatiques, notamment vinyltoluène ou styrène, des molécules de dopage de 1-phényl-3-mésityl-2-pyrazoline (PMP) et un agent de transfert de chaîne, notamment glycoldimercapto acétate, à chauffer le mélange en vue de l'amener à polymériser et à effectuer des opérations finales de gainage et d'étirage du polymère en vue de réaliser les fibres optiques. Le procédé de l'invention permet d'obtenir des fibres de très faible diamètre (de l'ordre de 30 à 50 microns) avec un coefficient d'extinction molaire réduit dans un rapport supérieur à 100 par rapport aux fibres scintillantes classiques; il permet également de supprimer totalememt les phénomènes de diaphotie lorsque les fibres sont agencées en faisceau.

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