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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography
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Quasi-distributed pressure sensor using intensity-type optical coherence domain polarimetry.

S Chen1, I P Giles, M Fahadiroushan

  • 1Department of Electrical and Electronic Engineering, King's College London, Strand, London WC2R 2LS, UK.

Optics Letters
|September 24, 2009
PubMed
Summary

This study presents a novel quasi-distributed optical fiber sensor for precise physical parameter measurement. The system utilizes white-light interferometry and polarization mode analysis, demonstrating potential for multiple sensor applications.

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Area of Science:

  • Optoelectronics
  • Fiber optic sensing technology
  • Interferometry

Background:

  • Quasi-distributed sensing offers advantages over point or fully distributed systems.
  • High-birefringence (Hi-Bi) fiber enables polarization-sensitive measurements.
  • White-light interferometry is suitable for locating sensing units in fiber sensors.

Purpose of the Study:

  • To develop and analyze a quasi-distributed optical fiber sensor system.
  • To investigate the use of white-light interferometry for sensor unit localization.
  • To measure physical parameters via induced cross-coupling in polarization modes.

Main Methods:

  • Utilizing a high-birefringence optical fiber.
  • Employing white-light interferometry for position detection.
  • Measuring physical parameters by analyzing cross-coupling between polarization modes.

Main Results:

  • The system successfully locates sensing units along the Hi-Bi fiber.
  • Analysis of performance-affecting factors like spurious signals and thermostability was conducted.
  • Preliminary experiments with 10 pressure sensors demonstrated system feasibility.

Conclusions:

  • The proposed quasi-distributed optical fiber sensor is a viable method for locating sensing units and measuring physical parameters.
  • Understanding cross-term spurious signals and thermostability is crucial for system optimization.
  • The system shows promise for multi-parameter sensing applications.