This work presents a new temperature-insensitive multipoint strain sensor based on fiber Bragg gratings. A divider circuit at the post detection port compensates for optical power variation and thermal instability induced by the nonflatness of the source spectrum. Experimental results show a measurement resolution of 0 35 S and a temperature stability of 0 005% for no strain ( 0 48% for a strain of 400 S) in an example with two sensing points. A measurement linearity of 0 17% is estimated in the range 0 to 350 S with no crosstalk.
