Abstract
Laser-Doppler vibrometry (LDVy) is especially interesting for applications where a vibration measurement could not be obtained with an accelerometer or any other surface-contacting sensor. In contrast to tactile sensors, a laser-Doppler vibrometer (LDV) measures without contact over a distance that could vary from millimeters to kilometers depending on the focusing optics of the measurement laser beam. Typical specimens, where it is impossible or impractical to measure tactilely, are hot, rotating, tiny, lightweight, or fragile. A specific problem of tactile sensors is the coupling of sound or vibrations to the sensor element. On the other hand, the optical pathlength varies between an LDV and a specimen without coupling issues if enough scattered light is detected. Therefore, it is not surprising that laser-Doppler vibrometry has gained an enormous importance in a wide range of applications. This chapter discusses the technology behind LDVy and explores the physical limits of the technique. Especially the high dynamic of the detected light power for an eye-safe infrared LDV of more than 150 dB as well as the displacement resolution in the picometer regime make LDVy a promising tool for medical applications.
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Rembe, C., Mignanelli, L. (2020). Introduction to Laser-Doppler Vibrometry. In: Kroschel, K. (eds) Laser Doppler Vibrometry for Non-Contact Diagnostics. Bioanalysis, vol 9. Springer, Cham. https://doi.org/10.1007/978-3-030-46691-6_2
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