Volume 10, Issue 1 (International Journal of Optics and Photonics (IJOP) Vol 10, No 1, Winter-Spring 2016)                   IJOP 2016, 10(1): 3-10 | Back to browse issues page

XML Print

Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Rasouli S, Esmaeili S, Sobouti F. Design and Construction of a Seismometer Based on the Moiré Technique: Detailed Theoretical Analysis, Experimental Apparatus, and Primary Results. IJOP. 2016; 10 (1) :3-10
URL: http://ijop.ir/article-1-243-en.html
Associate Professor of Physics Institute for Advanced Studies in Basic Sciences (IASBS)
Abstract:   (2202 Views)

We have built a vertical seismometer that works based on the moiré technique. One grating is attached to the suspended mass and one to the frame of the instrument. The two gratings are in relative motion, and the resulting moiré pattern magnifies this motion. The intensity of a light beam passing through the moving moiré fringes changes with time, and a light detecting system converts this power fluctuation into a voltage signal. From this voltage signal the time series of ground motion is obtained. We investigated the performance of the instrument theoretically, as well as experimentally. Our instrument can measure the amplitude of oscillation through moiré magnification. It is free from EM environmental noise, has adjustable sensitivity and dynamic range, and has simple and straightforward design. Furthermore, we introduce a novel way of data acquisition from moving moiré patterns.

Full-Text [PDF 1300 kb]   (829 Downloads)    
Type of Study: Research | Subject: Special
Received: 2015/11/21 | Revised: 2016/05/10 | Accepted: 2016/01/30 | Published: 2016/04/30

Add your comments about this article : Your username or Email:

© 2018 All Rights Reserved | International Journal of Optics and Photonics

Designed & Developed by : Yektaweb