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This article is presented by:
DIPTA RANJAN ROY
DEPT OF ECE
BIT, MESRA, RANCHI

EMBEDDED FIBER BRAGG GRATING SENSOR
FOR STRUCTURAL HEALTH MONITORING

OBJECTIVES

To design sensor system using Fiber Bragg Grating for
Structural Health Monitoring (SHM).

To analyze Reflection Spectra ,Transmission Spectra of
different types of Fiber Bragg Grating.

To implement FBG sensors in composite structures,
composite beams etc.

To sense different parameters (strain, temperature etc.)
within the structure.

To develop Digital Signal Processing techniques to
interrogate different FBG.

STRUCTURAL HEALTH MONITORING
(SHM)

Process of implementing a damage
detection and characterization strategy in
engineering structures.

Automobiles, Civil infrastructures and
Aerospace structures.

Consists of a network of sensors

Optical fiber sensors offers advantages like
 prone to EMI
 light in weight
 used in hazardous environment.

SHM using Fiber Bragg Grating Sensors

FIBER BRAGG GRATING PRINCIPLE

Longitudinal periodic variation of the index of refraction in the core
of an optical fiber
Fig.2 (Schematic diagram of a FBG Fiber)

The r.i variation in the core is given by

The grating is written in the core by exposing it to intense Optical
Interference Pattern.

The Gratings are permanent.

The light induced into the fiber follows Bragg’s Law.