Effect of demodulator unit on laser vibrometer calibration

A. Oota; T. Usuda; T. Ishigami; H. Nozato; Y. Hino

doi:10.1117/12.803331

17 June 2008 Effect of demodulator unit on laser vibrometer calibration

A. Oota, T. Usuda, T. Ishigami, H. Nozato, Y. Hino

Proceedings Volume 7098, Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; 70981J (2008) https://doi.org/10.1117/12.803331
Event: Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 2008, Ancona, Italy

Abstract

In this study, the effect of demodulator unit characteristics on the calibration of a laser vibrometer is investigated. For this purpose, two commercial available laser vibrometers with analogue demodulator units are used in the experiments. The demodulator units are electrically calibrated using simulated frequency-modulated signals, which are equivalent to output signals obtained from laser optics during laser vibrometer calibration. The calibration results of the demodulator units show extremely similar characteristics to laser vibrometer calibration results carried out in accordance with the new proposed draft (ISO16063-41). Although both calibration results had a large deviation of more than 0.5 % from the nominal sensitivity, a smaller deviation within 0.5 % was obtained by correction on the basis of the demodulator calibration results. The calibration results for both commercially availbale laser vibrometers indicate same amount of deviation after correction.. Most of the large deviation in the laser vibrometer calibration is due to the demodulator characteristics. In ISO16063-41 draft, laser vibrometer calibration is carried out by applying actual vibration to the laser vibrometer. However, the acceleration amplitude range applicable for calibration is limited due to the capability of the vibration exciter. Therefore, the measurable dynamic range of the laser vibrometer is not always sufficiently covered in the calibration. To overcome this problem, our investigation suggests the applicability of a combination of individual component calibrations.

Citation Download Citation

A. Oota, T. Usuda, T. Ishigami, H. Nozato, and Y. Hino "Effect of demodulator unit on laser vibrometer calibration", Proc. SPIE 7098, Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 70981J (17 June 2008); https://doi.org/10.1117/12.803331

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