title: Single fiber Bragg grating sensor with two sections of different diameters for longitudinal strain and temperature discrimination with enhanced strain sensitivity.
abstract: A single fiber Bragg grating (FBG) sensor with two sections of different diameters is proposed and experimentally demonstrated for discrimination and measurement of strain and temperature. A section of single FBG is etched in hydrofluoric acid solution to reduce diameter of the fiber by factor of <1/2 to increase its strain sensitivity. Different shifts of the Bragg wavelengths of chemically etched and nonetched gratings caused by different strain sensitivities are used to discriminate and measure strain and temperature. Maximum errors of +/-13 microepsilon (microstrain) and +/-1 degrees C are reported over 1700 microepsilon and 60 degrees C measurement ranges, respectively. Depending upon the diameter of the etched fiber grating, the design can also discriminate nanostrain from temperature.
authors.affiliation: Central Scientific Instruments Organisations, Sec.-30C, Chandigarh, India.
authors.forename: Samir K
authors.initials: SK
authors.lastname: Mondal
authors.forename: Umesh
authors.initials: U
authors.lastname: Tiwari
authors.forename: Gopal C
authors.initials: GC
authors.lastname: Poddar
authors.forename: Vandana
authors.initials: V
authors.lastname: Mishra
authors.forename: Nahar
authors.initials: N
authors.lastname: Singh
authors.forename: Subhash C
authors.initials: SC
authors.lastname: Jain
authors.forename: S N
authors.initials: SN
authors.lastname: Sarkar
authors.forename: K D
authors.initials: KD
authors.lastname: Chattoypadhya
authors.forename: Pawan
authors.initials: P
authors.lastname: Kapur