Image Number 2 for United States Patent #4888991.
A relative motion sensor sensing relative vibratory motions between two objects comprises a pair of eleongated members joined to one another at the first extremities thereof and respectively include a fastening means disposed at the second extremities thereof opposite to the first extremities for affixing the second extremities to the two objects under the relative vibratory motion. A Piezo electric element is confined in a space between the two elongated members adjacent to the joined first extremities thereof, wherein the relative vibratory motions transmitted to the second extremities of the two elongated members alternately change the pressure exerted on the Piezo electric element by the two elongated members and, consequently, the Piezo electric element generates alternating electromotive forces representing the relative vibratory motions.
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