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Updated: Jul 30, 2026
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Measurement of Tension Release During Laser Induced Axon Lesion to Evaluate Axonal Adhesion to the Substrate at Piconewton and Millisecond Resolution
Published on: May 27, 2013
Versatile, high-speed force transducer using a laser diode beam as an optical lever
M D Barb1, A B Morris, R Maass-Moreno
1The Krannert Institute of Cardiology and Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|January 21, 2000
Summary
A novel force transducer offers adjustable sensitivity and speed for muscle fiber research. Its innovative design enhances measurement precision in damp environments, enabling detailed study of muscle mechanics.
Area of Science:
- Biophysics
- Muscle Physiology
- Instrumentation
Background:
- Accurate measurement of force in biological tissues is crucial for understanding physiological function.
- Existing force transducers may face limitations in sensitivity, speed, or suitability for damp environments like muscle baths.
Purpose of the Study:
- To describe a novel force transducer with variable sensitivity and speed.
- To detail a specific configuration optimized for studying single, skinned skeletal muscle fibers.
Main Methods:
- Utilized a cantilever beam as the moving element within a muscle bath.
- Employed a proximal hinge to constrain beam bending.
- Incorporated a 30-fold optical lever amplification using a laser diode and photodiode pair.
- Designed for electrical components to be isolated from the damp environment.
Main Results:
- Achieved variable sensitivity and speed by substituting different cantilevers or adjusting hinge length.
- A 6-mm cantilever configuration demonstrated a resonant frequency of 22 kHz.
- The optimized transducer exhibited a sensitivity where noise was over 500-fold lower than the maximum expected force.
- Variations with significantly different sensitivities were also developed.
Conclusions:
- The described force transducer design offers a versatile and precise tool for muscle mechanics research.
- Its adaptability allows for optimization across a wide range of force measurement requirements.
- The design effectively addresses challenges posed by damp experimental conditions.
