Dual-frequency Optoelectronic Oscillator for Thermal-Insensitive Interrogation of a FBG Strain Sensor

We propose and experimentally demonstrate an approach to perform high-speed and high-resolution thermal-insensitive interrogation of a fiber Bragg grating (FBG) strain sensor based on a dual-frequency optoelectronic oscillator (OEO). Two phase-shifted FBGs (PSFBGs) are incorporated in the OEO loop t...

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Bibliographic Details
Published in:IEEE photonics technology letters 2017-02, Vol.29 (4), p.357-360
Main Authors: Xu, Ou, Zhang, Jiejun, Deng, Hong, Yao, Jianping
Format: Article
Language:English
Subjects:
Digital signal processors
fiber Bragg grating
Fiber optics sensor
High resolution
Interrogation
Microprocessors
Microwave photonics
Optical reflection
optoelectronic oscillator
Optoelectronics
Passband
Phase modulation
Questioning
Signal processing
Strain
Temperature measurement
Temperature sensors
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Summary:We propose and experimentally demonstrate an approach to perform high-speed and high-resolution thermal-insensitive interrogation of a fiber Bragg grating (FBG) strain sensor based on a dual-frequency optoelectronic oscillator (OEO). Two phase-shifted FBGs (PSFBGs) are incorporated in the OEO loop to implement a microwave photonic filter with two passbands based on phase modulation and phase-modulation to intensity-modulation conversion, to generate two microwave signals with their frequencies determined by the center frequencies of the two passbands. When one of the PSFBG is experiencing a strain, a beat frequency between the two microwave signals that is linearly proportional to the strain applied to the sensing PSFBG is obtained. By monitoring the beat frequency using a digital signal processor, the strain is measured. The proposed approach is experimentally demonstrated. High-resolution sensing with a resolution of 0.83~\mu \varepsilon that is thermal insensitive is demonstrated.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2016.2647261