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Optical Engineering

Two-dimensional, noncontact measurement of the natural frequencies of dragonfly wings using a quadrant position sensor
Author(s): LiJiang Zeng; Hirokazu Matsumoto; Shigeru Sunada; Takeshi Ohnuki; Keiji Kawachi
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Paper Abstract

A new method for measuring vibrations using a quadrant position sensor has been developed. It allows noncontact measurement of natural frequencies of objects that are transparent and small or lightweight, such as dragonfly wings. It simultaneously measures natural frequencies in two dimensions without any reflective mark having to be placed on the object. The system consists of a laser light source, a quadrant position sensor, and a spectrum analyzer. The object is illuminated by divergent laser rays coming from a microscope objective lens. The vibration amplitudes of the object are magnified and detected by the position sensor. By adjusting the distance between the object and either the lens or the sensor, the sensitivity and linearity of the system can be changed to measure objects of different size. We measured the natural frequencies of a dragonfly wing along the chord and the span, using a vein as a mark to measure displacement during vibration. This allowed us to determine the natural frequencies of bending and torsional deformation. Our results show that this two-dimensional, noncontact method can be effectively applied to the field of millibioflight.

Paper Details

Date Published: 1 April 1995
PDF: 6 pages
Opt. Eng. 34(4) doi: 10.1117/12.197080
Published in: Optical Engineering Volume 34, Issue 4
Show Author Affiliations
LiJiang Zeng, Research Development Corp. of Japan (Japan)
Hirokazu Matsumoto, National Research Lab. of Metrology (Japan)
Shigeru Sunada, Research Development Corp. of Japan (Japan)
Takeshi Ohnuki, Research Development Corp. of Japan (Japan)
Keiji Kawachi, Research Development Corp. of Japan (Japan)

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