Leval Julien, Picart Pascal, Boileau Jean Pierre, Pascal Jean Claude
Laboratoire d'Acoustique de l'Université du Maine, Unite Mixté de Recherche, Centre National de la Recherche Scientifique, 6613, Avenue Olivier Messiaen, 72085 Le Mans 9, France.
Appl Opt. 2005 Sep 20;44(27):5763-72. doi: 10.1364/ao.44.005763.
A setup that permits full-field vibration amplitude and phase retrieval with digital Fresnel holography is presented. Full reconstruction of the vibration is achieved with a three-step stroboscopic holographic recording, and an extraction algorithm is proposed. The finite temporal width of the illuminating light is considered in an investigation of the distortion of the measured amplitude and phase. In particular, a theoretical analysis is proposed and compared with numerical simulations that show good agreement. Experimental results are presented for a loudspeaker under sinusoidal excitation; the mean quadratic velocity extracted from amplitude evaluation under two different measuring conditions is presented. Comparison with time averaging validates the full-field vibrometer.
提出了一种利用数字菲涅耳全息术实现全场振动幅度和相位恢复的装置。通过三步频闪全息记录实现了振动的完全重建，并提出了一种提取算法。在研究测量幅度和相位的失真时考虑了照明光的有限时间宽度。特别地，进行了理论分析并与显示出良好一致性的数值模拟进行了比较。给出了正弦激励下扬声器的实验结果；给出了在两种不同测量条件下从幅度评估中提取的均方根速度。与时间平均法的比较验证了全场振动计。
