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Titolo:
Versatile, high-speed force transducer using a laser diode beam as an optical lever
Autore:
Barb, MD; Morris, AB; Maass-Moreno, R; Ragozzino, J; Ford, LE;
Indirizzi:
Indiana Univ, Sch Med, Krannert Inst Cardiol, Indianapolis, IN 46202 USA Indiana Univ Indianapolis IN USA 46202 ardiol, Indianapolis, IN 46202 USA Indiana Univ, Sch Med, Dept Med, Indianapolis, IN 46202 USA Indiana Univ Indianapolis IN USA 46202 pt Med, Indianapolis, IN 46202 USA Indiana Univ Purdue Univ, Dept Elect Engn, Indianapolis, IN 46202 USA Indiana Univ Purdue Univ Indianapolis IN USA 46202 anapolis, IN 46202 USA
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 1, volume: 88, anno: 2000,
pagine: 308 - 314
SICI:
8750-7587(200001)88:1<308:VHFTUA>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
RESONANT-FREQUENCY;
Keywords:
tension measurement; cantilever beam; muscle contraction;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
7
Recensione:
Indirizzi per estratti:
Indirizzo: Ford, LE Indiana Univ, Sch Med, Krannert Inst Cardiol, 1111 W 10th St, Indianapolis, IN 46202 USA Indiana Univ 1111 W 10th St Indianapolis IN USA 46202 N 46202 USA
Citazione:
M.D. Barb et al., "Versatile, high-speed force transducer using a laser diode beam as an optical lever", J APP PHYSL, 88(1), 2000, pp. 308-314

Abstract

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 bg 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 thecircuit was more than 500-fold smaller than the expected maximum force. Variations of this device with orders of magnitude different sensitivities are also described.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 01:32:58