The very low thermal expansion coefficient of silica at cryogenic temperature prevents the use of Fibre Bragg Grating (FBG) sensors for high resolution temperature monitoring in cryogenic environments involving liquid gases or space applications. To overcome such limitations sensors have been coated with different metals to improve the measurement sensitivity in the very low temperature region, i.e. 4.2-35 K. Various coatings have been deposited by electrowinning on the external fibre surface after aluminium pre-coating. Full characterization of this new type of sensor is described in the paper.
The effectiveness of metal coating on FBG sensor sensitivity at cryogenic temperature / Lupi, Carla; Felli, Ferdinando; M. A., Caponero; Paolozzi, Antonio. - STAMPA. - 6619:(2007), pp. 16-1-16-4. (Intervento presentato al convegno EWOFS 2007: Third European Workshop on Optical Fibre Sensors tenutosi a Napoli nel 4 July 2007 through 6 July 2007) [10.1117/12.738383].
The effectiveness of metal coating on FBG sensor sensitivity at cryogenic temperature
LUPI, Carla;FELLI, Ferdinando;PAOLOZZI, Antonio
2007
Abstract
The very low thermal expansion coefficient of silica at cryogenic temperature prevents the use of Fibre Bragg Grating (FBG) sensors for high resolution temperature monitoring in cryogenic environments involving liquid gases or space applications. To overcome such limitations sensors have been coated with different metals to improve the measurement sensitivity in the very low temperature region, i.e. 4.2-35 K. Various coatings have been deposited by electrowinning on the external fibre surface after aluminium pre-coating. Full characterization of this new type of sensor is described in the paper.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
