title: Temperature gradient sensor based on a long-fiber Bragg grating and time-frequency analysis.
abstract: A photonic sensor based on a 10-cm-long fiber Bragg grating (FBG) is presented and experimentally validated that is dedicated to detect the presence and the position of a temperature gradient. The system is based on the measurement of the central frequency distribution of the grating based on time-frequency domain analysis. A short optical pulse, having duration much shorter than the transit time along the grating, is coupled into the FBG, and the back-reflected pulse is scanned by means of an oscilloscope. A spatial resolution of 1 mm, given by half the input pulse duration, is achieved. The proposed sensor is based on a simple configuration and presents a sensing range of 10 cm, which could be further enhanced by fabricating a longer grating.
authors.forename: A L
authors.initials: AL
authors.lastname: Ricchiuti
authors.forename: D
authors.initials: D
authors.lastname: Barrera
authors.forename: K
authors.initials: K
authors.lastname: Nonaka
authors.forename: S
authors.initials: S
authors.lastname: Sales