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Related Concept Videos

Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

854
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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Measurements of Strain01:27

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...
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Updated: Dec 24, 2025

A Strain Gauge Monitor SGM for Continuous Valve Gape Measurements in Bivalve Molluscs in Response to Laboratory Induced Diel-cycling Hypoxia and pH
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Instrumenting Polyodon spathula (Paddlefish) Rostra in Flowing Water with Strain Gages and Accelerometers.

Clayton R Thurmer1, Reena R Patel1, Guilermo A Riveros1

  • 1US Army Engineer Research & Development Center, Information Technology Lab, 3909 Halls Ferry Road, Vicksburg, MS 39180, USA.

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|April 16, 2020
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Summary

Researchers developed a novel bio-inspired sensor to measure hydraulic forces on paddlefish rostra. This durable, wearable device shows promise for in vivo studies of fish biomechanics and bio-inspiration.

Keywords:
ARM M0Low-SWaPPolyodon spathulaaccelerometerbio-inspired materialsbio-inspired structuresin vivoinstrumentationprinted circuit board (PCB)strain gage

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Area of Science:

  • Biomimetics and Bio-inspiration
  • Mechanical Engineering
  • Ichthyology

Background:

  • The North American Paddlefish rostrum, with its unique lattice-like endoskeleton, exhibits exceptional durability and energy dissipation capabilities.
  • Existing research highlights the rostrum's superiority over man-made materials under extreme physical forces.
  • The response of the paddlefish rostrum to continuous hydraulic forces remains uncharacterized, necessitating specialized in vivo testing methods.

Purpose of the Study:

  • To develop and validate a novel, wearable instrumentation system for measuring in vivo hydraulic forces on the paddlefish rostrum.
  • To assess the feasibility of using this device for future studies on live swimming fish.
  • To advance bio-inspiration research by understanding the paddlefish rostrum's response to hydraulic stimuli.

Main Methods:

  • A custom printed circuit board (PCB) was designed, integrating a strain gage amplifier circuit with a digital three-axis accelerometer.
  • The instrumentation was combined with an Adafruit Feather M0 datalogger and microSD card for data acquisition.
  • The battery-powered device, encased in silicon, was attached to an amputated paddlefish rostrum using a silicon strap and tested in a swim tunnel.

Main Results:

  • The developed instrumentation successfully acquired interpretable data when tested on an amputated paddlefish rostrum in a controlled aquatic environment.
  • Proof-of-concept testing demonstrated the system's capability to capture relevant biomechanical responses.
  • The results indicate the instrumentation's potential for successful application in live fish during swimming.

Conclusions:

  • The developed wearable sensor system is a viable tool for measuring hydraulic forces on the paddlefish rostrum.
  • This instrumentation paves the way for future in vivo experiments on live, swimming paddlefish.
  • The findings contribute to bio-inspiration research by providing a method to study the functional mechanics of the paddlefish rostrum under realistic conditions.