Versatile, high-speed force transducer using a laser diode beam as an optical lever
| Autor: | Andrew B. Morris, Joseph Ragozzino, Roberto Maass-Moreno, Matthew D. Barb, Lincoln E. Ford |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Cantilever
Materials science Rotation Physiology Movement Muscle Fibers Skeletal Transducers Bending Sensitivity and Specificity law.invention Optics law Isometric Contraction Physiology (medical) Animals Isotonic Contraction Muscle Skeletal Amplifiers Electronic Laser diode business.industry Lasers Water Muscle Smooth Equipment Design Laser Trachea Kinetics Transducer business Sensitivity (electronics) Beam (structure) Muscle Contraction |
| Zdroj: | Journal of Applied Physiology. 88:308-314 |
| ISSN: | 1522-1601 8750-7587 |
| DOI: | 10.1152/jappl.2000.88.1.308 |
| Popis: | A force transducer with variable sensitivity and speed is described. Its moving element is a cantilever beam that projects vertically into a muscle bath. A brace constrains bending of the beam to a short, proximal “hinge.” Rotation of the beam about the hinge is amplified 30-fold by an optical lever consisting of a laser diode beam reflected from a mirror on the cantilever to a photodiode pair. This design places the electrical components at a distance from the damp environment of the muscle bath. Large changes in sensitivity and speed can be obtained by substituting different cantilevers. Smaller changes can be made by varying the length of the hinge. A transducer with a 6-mm cantilever optimized for the study of single, skinned skeletal muscle fibers is described in detail. This device had a resonant frequency of 22 kHz and sensitivity such that the total root-mean-square noise in the circuit was more than 500-fold smaller than the expected maximum force. Variations of this device with orders of magnitude different sensitivities are also described. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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