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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.

Measurements of Strain

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Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain gauge...

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Related Experiment Video

Updated: Jun 19, 2026

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

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Published on: September 30, 2019

Nonlinear strain response of two-mode fiber-optic interferometer.

B K Kim, S H Yun, I K Hwang

|October 31, 2009

Summary

This study reveals that the nonlinear response of a two-mode fiber interferometer significantly amplifies near the cutoff wavelength of the second-order mode (LP11). This finding is crucial for developing advanced fiber optic sensors.

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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

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Area of Science:

Optics and Photonics
Fiber Optic Sensing
Nonlinear Optics

Background:

Fiber interferometers are sensitive to external stimuli.
Nonlinear optical effects in fibers can enhance sensing capabilities.
Understanding mode behavior is key to optimizing fiber devices.

Purpose of the Study:

To experimentally and theoretically investigate the nonlinear response of a two-mode fiber interferometer.
To identify conditions that dramatically increase this nonlinearity.
To explore the impact of wavelength on the interferometer's nonlinear behavior.

Main Methods:

Utilized a two-mode fiber interferometer setup.
Performed experimental measurements of the nonlinear response.
Conducted theoretical modeling to analyze the observed phenomena.
Varied the wavelength to study its effect on nonlinearity.

Main Results:

Observed a dramatic increase in nonlinearity as wavelength approached the cutoff wavelength of the second-order mode (LP11).
Confirmed theoretical predictions of enhanced nonlinear effects.
Quantified the relationship between wavelength and nonlinear response.

Conclusions:

The nonlinear response of two-mode fiber interferometers is highly sensitive to wavelength.
Approaching the LP11 mode cutoff wavelength offers a pathway to significantly boost nonlinearity.
This enhanced nonlinearity has potential applications in advanced fiber optic sensing and nonlinear optics.