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Measurements of Strain

Measurements of Strain

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...

Design Example: Strain Gauge Bridge or Wheatstone Bridge

Design Example: Strain Gauge Bridge or Wheatstone Bridge

The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...

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Updated: Jul 9, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

Ultrahigh-sensitivity fiber-optic strain and temperature sensor.

E J Friebele, M A Putnam, H J Patrick

|December 18, 2007

Summary

This summary is machine-generated.

Ultrahigh-sensitivity static strain sensing was achieved using fiber etalon cavities. This novel sensor enables simultaneous strain and temperature measurement with high accuracy.

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Area of Science:

Fiber optic sensing
Optical metrology
Materials science

Background:

Fiber etalon cavities are crucial for high-precision measurements.
Strain sensing requires high sensitivity and stability.
Fluoride glass fibers offer unique thermo-optic properties.

Purpose of the Study:

To demonstrate ultrahigh-sensitivity static strain sensing using fiber etalon cavities.
To investigate the use of fluoride glass fibers for enhanced sensor performance.
To achieve simultaneous strain and temperature measurements.

Main Methods:

Fabrication of two fiber etalon cavities using silica and fluoride fibers.
Utilizing the anomalous thermo-optic coefficient of fluoride glass for drift determination.
Implementing a system for simultaneous strain and temperature measurement.

Main Results:

Achieved ultrahigh-sensitivity static strain sensing with noise equivalent strain <= 1.5 nε rms.
Demonstrated determination of thermal and laser drift using fluoride glass fibers.
Obtained simultaneous strain and temperature measurement with 6.4% strain error and 0.68% temperature error.

Conclusions:

Fiber etalon cavities, particularly those incorporating fluoride fibers, offer a promising platform for ultrahigh-sensitivity strain sensing.
The unique properties of fluoride glass enable compensation for thermal and laser drift, improving measurement accuracy.
The developed sensor system is capable of simultaneous and accurate strain and temperature determination.