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Proceedings Paper

Filtering possibilities for processing optoelectronic current for acceleration measurements
Author(s): Andreea-Rodica P. Sterian; Cristian I. Toma
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Paper Abstract

This paper presents robust methods for filtering the optoelectronic current generated by laser signals in case of vibration measurements. First is presented a general procedure for obtaining signals corresponding to certain spatial vibrations by using diffracting grating. The diffracting grating is attached to the body supposed to present vibrations, and a set of four photodetectors is placed in the measuring area in symmetrical positions as related to a point of maximum intensity for the received light. The photoelectric current generated by this set is further filtered and processed, so as three electronic signals corresponding to displacements of the body along all three rectangular spatial coordinates axes to be obtained. Then is presented a method for determining the derivative of the spatial coordinates of the body as related to tune, in conditions of low-amplitude vibrations overlapped to a general translation ofthe body along a certain direction, under the influence of an external force. It is shown that such a structure is suitable for controlling the position of material bodies, due to the fact that the derivative of the position as related to time represents the acceleration of the body (proportional to the external force acting upon it).

Paper Details

Date Published: 22 May 2002
PDF: 6 pages
Proc. SPIE 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2002); doi: 10.1117/12.468162
Show Author Affiliations
Andreea-Rodica P. Sterian, Univ. Politehnica Bucharest (Romania)
Cristian I. Toma, Univ. Politehnica Bucharest (Romania)

Published in SPIE Proceedings Vol. 4827:
Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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