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Proceedings Paper

Optomechatronic load cell validation according to the American standards
Author(s): Francisco Javier Martínez Serrano; Alma A. Camacho P.
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Paper Abstract

Productive activities require measuring systems as a key tool for manufacturing quality goods. Metal mechanical industries develop their processes based on the control of a high precision fit between two pieces of a pressureassembled product. Therefore, engineering materials are constantly subjected to resistance tests. Balance test equipment and mechanical vibrations work under the principle of force measurements. The most precise stress measurement methods are done with electromechanical devices known as load cells. They basically consist of a tiny electric resistor that is adhered to a mechanical element that may be under stress. Cyclic stresses also directly affect the performance of the measuring element including the resistance itself, which changes as the cyclic fatigue progresses (the measuring element is a very thin coil with limited strength). In this research, we developed an optomechatronic load cell1 whose operating principle is based on measuring the stress load applied to a mechanical element. The deformation causes a reduction in the distance between the emitter and the receptor producing an electrical signal. It must be established that the distribution of the light intensity varies between the emitter and the receptor due to the generated displacement. An infrared emitter was adapted to the load cell whose signal was received by the receptor at the other end. The second stage included a demonstration that the optoelectronic system is capable of measuring external stresses on a mechanical element by using an indirect method of measuring stresses. Here we present the results from those experiments, which include some adaptations on the mechanical element. We implemented a prototype sensitive to the deformation produced by the mechanical element (load cell). As a result of the two stages, we plan to test the system in academic and industrial applications. The third step in the research is to validate the optomechatronic load cell under the E74-065 ASTM Standard2 showing the results based on the resolution, sensitivity, and repeatability required by the standard.

Paper Details

Date Published: 3 December 2009
PDF: 7 pages
Proc. SPIE 7499, Seventh Symposium Optics in Industry, 74990Q (3 December 2009); doi: 10.1117/12.849922
Show Author Affiliations
Francisco Javier Martínez Serrano, Univ. de la Salle Bajío (Mexico)
Alma A. Camacho P., Univ. de la Salle Bajío (Mexico)
CIATEC, A.C. (Mexico)

Published in SPIE Proceedings Vol. 7499:
Seventh Symposium Optics in Industry
Guillermo García Torales; Jorge L. Flores Núñez; Gilberto Gómez Rosas; Eric Rosas, Editor(s)

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