Abstract
The present invention provides a dual fiber Bragg grating strain sensor system which comprises: a wideband light source, a power reading unit, and a sensor having a first fiber Bragg grating and a second fiber Bragg grating, wherein the light of the wideband light source is transmitted to the first fiber Bragg grating and the second fiber Bragg grating through the power reading unit, the first fiber Bragg grating and a second fiber Bragg grating generate a first reflection band and a second reflection band and transmit them back to the power reading unit.