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Proceedings Paper

Heterodyne interferometry for calibration of standard accelerometers in high frequency regime
Author(s): Alexandre Cabral; José Manuel Rebordão; Vitor Oliveira; Maria Isabel Godinho; Mário Costanzo Nunes
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Paper Abstract

Coherent interferometric optical interferometry is one of the most interesting techniques for the primary calibration of standard accelerometers. By measuring the displacement caused by a sinusoidal excitation applied to the accelerometer, it is possible to determine the value of the acceleration. An experimental system was developed and implemented, based in relative interferometry with heterodyne interferometry, for the calibration of standard accelerometers in high frequency regime, up to 10 kHz. Heterodyne detection is needed to overcome a limitation of homodyne based systems in terms of measuring range, both in acceleration and frequency. In terms of performances, the system was capable of calibrations for frequencies from 100 Hz to 10 kHz and accelerations from 0.5 ms-2 to 400 ms-2. In this paper, we present a detailed description of the selected method, the implemented experimental systems and data processing algorithms, and the test results obtained in the calibration of a standard accelerometer, evaluating systems performances in terms of working range.

Paper Details

Date Published: 21 June 2006
PDF: 7 pages
Proc. SPIE 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 63451J (21 June 2006); doi: 10.1117/12.693088
Show Author Affiliations
Alexandre Cabral, Instituto Nacional de Engenharia, Tecnologia e Inovação, I.P. (Portugal)
José Manuel Rebordão, Instituto Nacional de Engenharia, Tecnologia e Inovação, I.P. (Portugal)
Vitor Oliveira, Instituto Nacional de Engenharia, Tecnologia e Inovação, I.P. (Portugal)
Maria Isabel Godinho, Instituto Nacional de Engenharia, Tecnologia e Inovação, I.P. (Portugal)
Mário Costanzo Nunes, Instituto Nacional de Engenharia, Tecnologia e Inovação, I.P. (Portugal)


Published in SPIE Proceedings Vol. 6345:
Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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