This invention is predicated upon applicants' discovery that the performance of thermally adjustable fiber grating devices is enhanced by disposing them within a vessel for thermal isolation. The vessel is sufficiently larger than the fiber to avoid contact with the grating yet sufficiently small to isolate the grating from substantial air currents. Conveniently, the vessel is a cylindrical tube having elastomeric end seals. Advantageously microcapillary tubes passing through the elastomeric seals provide openings for the fiber to pass through the tube.

Esta invención se afirma sobre el descubrimiento de los aspirantes que el funcionamiento de los dispositivos grating de la fibra termal ajustable es realzado disponiéndolos dentro de un recipiente para el aislamiento termal. El recipiente es suficientemente más grande que la fibra evitar el contacto con la rejilla con todo suficientemente pequeño para aislar la rejilla de corrientes de aire substanciales. Convenientemente, el recipiente es un tubo cilíndrico que tiene sellos elastomeric del extremo. Los tubos ventajoso microcapillary que pasan a través de los sellos elastomeric proporcionan las aberturas para la fibra al paso a través del tubo.

 
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