Abstract
The paper presents a technique for measuring membrane displacements with
one motionless camera. The method consists in measuring the distance to an
object based on one image obtained from a motionless camera with a
fixed-focus lens. The essence of the proposed measurement technique is to
determine changes of the distance between a membrane and a video camera
based on analysis of changes in the focus view of a marker placed on the
membrane plane. It is proven that the used technique allows to monitor the
frequency and amplitude of the membrane vibration. The tests were
performed for the oscillation frequency in the range from 0.5 Hz to 6 Hz
and deviations from the neutral position in the range of ±3 mm.
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