Optical Design and Engineering

New oscillation detector system based on the moiré technique

[+] Author Affiliations
Shamseddin Esmaeili, Anooshiravan Ansari, Hosseain Hamzehloo

International Institute of Earthquake Engineering and Seismology, Department of Seismology, Arghavan Street, Tehran 3913/19395, Iran

Opt. Eng. 54(10), 105103 (Oct 12, 2015). doi:10.1117/1.OE.54.10.105103
History: Received May 1, 2015; Accepted September 14, 2015
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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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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Shamseddin Esmaeili ; Anooshiravan Ansari and Hosseain Hamzehloo
"New oscillation detector system based on the moiré technique", Opt. Eng. 54(10), 105103 (Oct 12, 2015). ; http://dx.doi.org/10.1117/1.OE.54.10.105103


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