External-cavity laser diode sensing for vibration measurement in aerospace applications

Nicholas A. J. Lieven; Ian H. White; Christine Mignosi; Roger P. Griffiths; Richard V. Penty

doi:10.1117/12.307685

1 June 1998 External-cavity laser diode sensing for vibration measurement in aerospace applications

Nicholas A. J. Lieven, Ian H. White, Christine Mignosi, Roger P. Griffiths, Richard V. Penty

Proceedings Volume 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1998) https://doi.org/10.1117/12.307685
Event: Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 1998, Ancona, Italy

Abstract

This paper reports a preliminary study of recently proposed vibration sensor using an external cavity laser sensor. The behavior of the sensor is compared with conventional laser interferometers used for aerospace applications. It is found that the new method has advantages in the relatively few optical components that are required, namely: a collimated laser diode, and a reflective surface at the point of incidence on the structure. In addition, output of the device is an absolute measure of displacement. As well as outlining the principle of operation of the device, the practical issues of application are discussed. Although the system is still in development it offers the prospect of a low-cost, robust alternative to standard laser vibrometry.

Citation Download Citation

Nicholas A. J. Lieven, Ian H. White, Christine Mignosi, Roger P. Griffiths, and Richard V. Penty "External-cavity laser diode sensing for vibration measurement in aerospace applications", Proc. SPIE 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (1 June 1998); https://doi.org/10.1117/12.307685

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KEYWORDS

Sensors

Semiconductor lasers

Vibrometry

Aerospace engineering

Bandpass filters

Laser interferometry

Linear filtering

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