Abstract
In order to understand the details of the micro- and nano- motions, it is necessary to measure the three-dimensional velocity under a microscopy. Thus, the development of a new 3-D measuring technique by a single camera is strongly needed. Presently, the Doppler phase-shifting holography has been used for the measurement of a micro object. This method extracts the signal of a fixed frequency caused by the Doppler beat between the object light and the reference light. The longitudinal velocity of an object can be measured by its beat frequency. In this study, a holography of a micro object has been observed with expanding optics.
