Global noise characteristics of a laser Doppler vibrometer part I: theory

摘要: The use of a laser Doppler vibrometer to obtain velocity information from vibrating structures has gained wide acceptance in recent years. Although such an instrument can yield spatially dense matrix information, several users have noted `noise' at certain points the spatial field. technique by which SLDV system operates results occasional `drop-outs' are unidirectional, always estimating response closer zero than reality. These `drop-out' areas occur more predominately maximum with small rotational components. Alternatively, exhibiting minimum large components less susceptible `noise'. In this paper, experiment visualize speckle pattern motions received photodetectors during these vibration conditions is presented. Theories regarding source(s) developed.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading abstract permitted personal only.