Construction of a Dynamic Displacement Measurement Apparatus and Its Application to Impact Fracture Studies.

1 January 1997

journal article
Published by Japan Society of Mechanical Engineers in TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A

Vol. 63 (611) , 1431-1436
https://doi.org/10.1299/kikaia.63.1431

Abstract

An apparatus for measurement of the dynamic displacement of a subject has been constructed. It consists of a position sensing detector (PSD), optical fiber and He-Ne laser light source. One end of the fiber is coupled with the light source and the other end is mounted on the moving subject. The laser light from this fiber end on the subject is focused on the PSD which is used to evaluate the change in the subject displacement. The characteristic frequency response of the apparatus has been studied in detail and is concluded to be as high as 100 kIlz. The apparatus was used in an impulsive three-point bend test for notched PC specimens and showed excellent serviceability for impact studies.

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