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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...

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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Production of a Strain-Measuring Device with an Improved 3D Printer

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Hybrid LPG-FBG Based High-Resolution Micro Bending Strain Sensor.

Song-Bi Lee¹, Young-Jun Jung², Hun-Kook Choi²

¹Department of Cognitive Science, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea.

Sensors (Basel, Switzerland)

|December 30, 2020

Summary

This study introduces a hybrid Bragg grating sensor for precise, real-time motion monitoring. The wearable sensor achieves picometer-level accuracy for dynamic movement analysis, enhancing practical applications.

Keywords:

femtosecond laser long-period grating optical fiber Bragg grating wearable sensor

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Area of Science:

Optoelectronics
Sensor Technology
Materials Science

Background:

Wearable sensors require high sensitivity and reliability for practical use.
Monitoring dynamic, continuous motion necessitates fast response times.
Bragg grating sensors offer potential for precise optical measurements.

Purpose of the Study:

To explore a hybrid high-resolution Bragg grating sensor for dynamic motion monitoring.
To achieve real-time measurement of wavelength shifts in picometer units.
To demonstrate the practical applicability of the sensor in wearable devices.

Main Methods:

Utilized femtosecond laser Bragg grating processing on an optical wave path with long-period grating.
Derived wavelength shift patterns for real-time monitoring.
Investigated Bragg signal pattern measurement on the reflection spectrum.

Main Results:

Confirmed the feasibility of measuring Bragg signal patterns using the developed system.
Successfully derived wavelength shift patterns in picometer units for real-time monitoring.
Demonstrated a practical method for wearing the sensor, validating its wearable potential.

Conclusions:

The hybrid high-resolution Bragg grating sensor is suitable for fast, reliable dynamic motion monitoring.
The system enables sophisticated micro-transformation measurements in picometer units.
The sensor shows significant applicability for advanced wearable technology.