In this work a method for the dynamic calibration of in-fibre Bragg grating sensors is proposed. The adopted measurement technique is based on a laser Doppler vibrometer used to measure, indirectly, the deformation induced in the area on which an FBG sensor has been applied. The FBG sensor is bonded on a specifically designed double C frame, which allows for a constant pure bending load on the sensing area. Excitation of the structure is obtained by means of a shaker which generates a sinusoidal signal at constant frequency. The greatest excitation frequency is about 10-20 Hz, depending on the characteristics of FBG interrogation system. In order to avoid thermal effects, calibration has been performed, using a climatic chamber, at constant temperature.
Definition of FBG sensor photoelastic coefficient by laser Doppler vibrometry
MONTANINI, Roberto;
2002-01-01
Abstract
In this work a method for the dynamic calibration of in-fibre Bragg grating sensors is proposed. The adopted measurement technique is based on a laser Doppler vibrometer used to measure, indirectly, the deformation induced in the area on which an FBG sensor has been applied. The FBG sensor is bonded on a specifically designed double C frame, which allows for a constant pure bending load on the sensing area. Excitation of the structure is obtained by means of a shaker which generates a sinusoidal signal at constant frequency. The greatest excitation frequency is about 10-20 Hz, depending on the characteristics of FBG interrogation system. In order to avoid thermal effects, calibration has been performed, using a climatic chamber, at constant temperature.Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
