  In this paper, we propose a novel non-contact vibration measurement system
that is competent in estimating linear and/or rotational motions of machine
parts. The technique combines microwave radar, standard camera, and optical
strobe to capture vibrational or rotational motions in a relatively fast and
affordable manner when compared to the current technologies. In particular, the
proposed technique is capable of not only measuring common vibrational
parameters (e.g. frequency, motor rpm, etc.) but also provides spatial
information of the vibrational sources so that the origin of each vibrational
point can be identified accurately. Furthermore, it can also capture the
wobbling motion of the rotating shafts. Thus, the proposed method can find
immense applications in preventive maintenance across various industries where
heavy machinery needs to be monitored unobtrusively or there is a requirement
for non-contact multi-point vibration measurement for any machine inspection
applications.
