Analyzing real-time capability of raw laser-Doppler vibrometer signal combination for signal diversity

A limiting factor for Laser-Doppler vibrometer (LDV) measurements is the laser speckle effect, which occurs when measuring on rough surfaces. This effect limits the minimally detectable vibration amplitudes and increases the noise level. In order to reduce the impact of the effect, signal diversity is used in the state of the art. In a previous publication, we demonstrated a newly developed algorithm that combines raw signals, improving the signal quality of an algorithm from the literature. In this article, we examine its real-time capability and evaluate the application range of our algorithm. In addition, we briefly address an extension of the setup to allow the measurement of the 3D velocity vector.