偏光干渉計による振動モード形の可視化

抄録

Experimental modal analysis that is fundamental technology is known to obtain dynamic characteristics of structures. In conventional vibration testing, vibration responses of the structures are generally measured by accelerometers during applying excitation forces by an exciter to ones. The contact type devices cannot be used for untouchable objects such as mirrors to measure the inputs and outputs in vibration testing. If we use a laser Doppler vibrometer (LDV) that is commercially available device, we can obtain the vibration response without contact. The LDV is a point measurement device, so we see the measurement time in a long time as an issue. In this paper, we measure using a surface vibration measurement system incorporating a high-speed polarization camera with an interferometer that is a commercially available one. Moreover, we show that this system can visualize a vibration mode shape of the mirror.