Simultaneous measurement of strain and temperature with a pair of
matched fiber Bragg gratings
Paper Abstract
A novel approach for simultaneous measurement of static/dynamic strain and temperature with a pair of
matched fiber Bragg grating(FBG)s is proposed. When a diode laser locked to the mid reflection frequency of reference
FBG is used to illuminate the sensor FBG, reflected intensity changes with strain on sensor FBG. Reference FBG
responds with temperature on sensor FBG and is immune to strain, hence, wavelength of the diode laser acts as a
signature for temperature measurement. Theoretical sensitivity limit for static strain and temperature are 1.2 nε √Hz and
0.0011 °C respectively. Proposed sensor shows a great potential in high sensitive strain measurements with a simplified
experimental setup.
This paper was published in SPIE Proceedings Vol. 7813
