Implications of system "sensitivity" and "resolution" on an ultrasonic-detecting laser Doppler vibrometer

Andrew C. Lewin; Georg Siegmund

doi:10.1117/12.185308

8 September 1994 Implications of system "sensitivity" and "resolution" on an ultrasonic-detecting laser Doppler vibrometer

Andrew C. Lewin, Georg Siegmund

Author Affiliations +

Proceedings Volume 2358, First International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1994) https://doi.org/10.1117/12.185308
Event: Vibration Measurements by Laser Techniques: First International Conference, 1994, Ancona, Italy

Abstract

Many reports concerning Laser Doppler Vibration Sensing describe the detection systems as 'High-Sensitivity', and imply this is a correct manner of specifying the performance of the optical system. In this paper, we describe how the performance of a vibrometer is determined by two parameters, which we have (arbitrarily) defined sensitivity and resolution. An analysis of these performance parameters for two different Vibrometer configurations shows that a fiber-optic based system which provides marginally lower sensitivity than its bulk optic counterpart, can actually provide a better resolution. An analysis of various applications and their system requirements, shows that Vibrometer users must understand which of these parameters is the most important. For example, NDT testing using an Ultrasonic Detecting LDV is shown to be mostly critical to resolution (small signal detection) and not so critical in terms of sensitivity (performance from poor quality surfaces). In this paper we present a method of defining sensitivity and resolution and outline the results obtained with fiber and non-fiber systems.

Citation Download Citation

Andrew C. Lewin and Georg Siegmund "Implications of system "sensitivity" and "resolution" on an ultrasonic-detecting laser Doppler vibrometer", Proc. SPIE 2358, First International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (8 September 1994); https://doi.org/10.1117/12.185308

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