Low-cost all-fiber Bragg grating sensing system for temperature and strain measurements

A low-cost all-fiber Bragg grating sensing system for temperature and strain measurements is presented. Broadband interrogation and grating-based optical filtering are used to detect a strain- or temperature-induced Bragg wavelength shift with a resolution of 1 µe and 0.1°C. The passive nature of the grating demodulation enables dynamic measurements, limited only by the electronic circuitry involved in the system read out. The same system is also used for dynamic strain detection. A fiber grating is bonded to a piezoceramic actuator in different configurations. A laser-triangulation-based system is used as a reference measurements up to 10 kHz, while dynamic strain measurements by a Fiber Bragg grating (FBG) are carried out up to 50 kHz, demonstrating a dynamic resolution of ≈40 ne/(Hz) 1/2 .

[1]  Eric Udd,et al.  Advanced fiber-grating strain sensor systems for bridges, structures, and highways , 1998, Smart Structures.

[2]  R. Measures,et al.  A passive wavelength demodulation system for guided-wave Bragg grating sensors , 1992, IEEE Photonics Technology Letters.

[3]  T. Coroy,et al.  Active wavelength measurement system using an InGaAs-InP quantum-well electroabsorption filtering detector , 1996, IEEE Photonics Technology Letters.

[4]  A. Kersey,et al.  High-resolution fibre-grating based strain sensor with interferometric wavelength-shift detection , 1992 .

[5]  Alan D. Kersey,et al.  All-fibre Bragg grating strain-sensor demodulation technique using a wavelength division coupler , 1994 .

[6]  Wei Jin,et al.  FMCW multiplexing of fiber Bragg grating sensors , 2000, IEEE Journal of Selected Topics in Quantum Electronics.

[7]  Antonello Cutolo,et al.  Integrated fiber optic sensing system for in-situ characterization of the curing process of thermoset-based composites , 2001, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[8]  K. Hill,et al.  Fiber Bragg grating technology fundamentals and overview , 1997 .

[9]  Michael A. Davis,et al.  Fiber grating sensors , 1997 .

[10]  A. Kersey,et al.  Multiplexed fiber Bragg grating strain-sensor system with a fiber Fabry - Perot wavelength filter. , 1993, Optics letters.

[11]  Jose Luis Santos,et al.  All-fibre interrogation technique for fibre Bragg sensors using a biconical fibre filter , 1996 .