New oscillation detector system based on the moiré technique

Shamseddin Esmaeili; Anooshiravan Ansari; Hosseain Hamzehloo

doi:10.1117/1.OE.54.10.105103

12 October 2015 New oscillation detector system based on the moiré technique

Shamseddin Esmaeili, Anooshiravan Ansari, Hosseain Hamzehloo

Author Affiliations +

Optical Engineering, Vol. 54, Issue 10, 105103 (October 2015). https://doi.org/10.1117/1.OE.54.10.105103

Abstract

We have described a method to detect characteristics of an oscillation system based on the moiré technique. We can determine amplitude, resonance frequency, and damping coefficient of an oscillating system both in vertical and horizontal directions. For this approach, the displacement of the oscillatory mass must be accurately determined. The displacement is recorded by the moiré detecting procedure. A spring-suspended mass, whose position is monitored by moiré technique, is used to test this idea. Our detecting system consists of a pair of similar gratings which are installed near each other without physical contact. The planes of the gratings are parallel and the lines of gratings have a small angle with respect to each other. Also, a laser diode, a silicon photo-diode, and a narrow slit have been used and fixed to the frame to illuminate fringes’ displacement due to the suspended mass movement. The displacement of the mass relative to the fixed grating changes the light intensity on the detector. The intensity of the light is recorded as voltage by the light detector. The output voltage can be used to measure the oscillator movement. This method can detect displacements of the order of microns. Also, the experimental result and theoretical simulation are compared.

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Shamseddin Esmaeili, Anooshiravan Ansari, and Hosseain Hamzehloo "New oscillation detector system based on the moiré technique," Optical Engineering 54(10), 105103 (12 October 2015). https://doi.org/10.1117/1.OE.54.10.105103

Published: 12 October 2015

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