String Model Resonator High Accuracy Measurement for F B G Sensors
Anubhuti Khare1, Manish Saxena2 , Arun Kumar Mishra3
1Dr. Anubhuti Khare, Reader, Department of Electronics and Communication, University Institute of Technology, Rajeev Gandhi Technical University, Bhopal.
2Manish Saxena, Head Of Electronics and Communication Department, Bansal Institute Of Science And Technology Bhopal.
3Arun kumar mishra, Student Mtech (Digital Communication), Bansal Institute Of Science And technology Bhopal.

Manuscript received on November 15, 2011. | Revised Manuscript received on November 21, 2011. | Manuscript published on December 30, 2011. | PP: 22-27  | Volume-1, Issue-2, December 2011. | Retrieval Number: B0126111111 /2011©BEIESP

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Abstract: Fibre Bragg grating (FBG) sensors are widely accepted as strain and vibration monitoring devices for advanced composite mechanical structures. This paper describes a string resonator that is used for the interrogation system of a Fiber Bragg Grating (FBG) strain sensor. For several years now, civil engineers have been collaborating with researchers in the field of optoelectronics, in efforts to develop fiber optic sensing and monitoring systems for civil engineering structures. Optoelectronics are the core of the telecommunications industry and are an important part of sensing in the aerospace industry. In the last ten to twenty years, optoelectronic technology has emerged in the fields of civil engineering, manufacturing and biomedicine, etc., in products such as fiber optic sensors. The strain on the fiber piece is calculated from the measured frequency based on that the natural frequency of a string is a function of the applied absolute strain. Existing research considered a fiber as a string, but a fiber is not a string in the strict sense due to its bending stiffness, thus the fiber should be modeled as a beam accompanied with an axial force. In the vibration modeling, the relationship between the strain and the natural frequency is derived, and then the resonance condition is described in terms of both the phase and the mode shape for sustaining resonant motion. Several experiments verify the effectiveness of the proposed model of the fiber.
Keywords: Smart structure, resonator fiber Bragg grating sensor, Tunable Optical Filter, beam model, Demodulation technique, string model.