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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Continuous scan laser Doppler vibrometry ： ウィキペディア英語版 Continuous scan laser Doppler vibrometry Continuous scan laser Doppler vibrometry (CSLDV) is a method of using a laser Doppler vibrometer (LDV) in which the laser beam is swept across the surface of a test subject to capture the motion of a surface at many points simultaneously. This is different from scanning laser vibrometry (SLDV) in which the laser beam is kept at a fixed point during each measurement and quickly moved to a new position before acquiring the next measurement. ==Advantages and disadvantages== CSLDV can allow one to capture the mode shapes of a structure with high resolution much more quickly than would be possible with SLDV. Allen & Sracic 〔M. S. Allen and M. W. Sracic, "A New Method for Processing Impact Excited Continuous-Scan Laser Doppler Vibrometer Measurements," Mechanical Systems and Signal Processing, vol. 24, pp. 721–735, 2010.〕 show results where measurements were acquired with CSLDV in a hundredth of the time that would be required for LDV. Allen & Aguilar 〔M. S. Allen and D. M. Aguilar, "Model Validation of a Bolted Beam Using Spatially Detailed Mode Shapes Measured by Continuous-Scan Laser Doppler Vibrometry," in 50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference Palm Springs, California, 2009.〕 postulated that the additional detail available from CSLDV might provide important information when validating structural dynamic models. CSLDV also makes testing with an instrumented hammer practical with LDV, and some have speculated that CSLDV might be useful in cases where it is impossible to recreate the input forces, such as explosive loadings. The primary disadvantage of CSLDV is the additional laser speckle noise that occurs if the laser spot scans the structure too quickly. Speckle noise is caused by micro-scale irregularities in the surface that change the intensity pattern of the laser light received by the LDV as it scans the surface. Similar problems arise when applying LDV to rotating shafts, crankshafts for example. Speckle noise is difficult to predict, depending on the properties of the surface, the geometry of the structure and position of the LDV,〔S. Rothberg, "Numerical simulation of speckle noise in laser vibrometry," Applied Optics, vol. 45, pp. 4523–33, 2006.〕 so further research is needed to establish the limits of CSLDV. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Continuous scan laser Doppler vibrometry」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.