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Proceedings Paper

Fiber optic interferometer as a security element
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Paper Abstract

Interferometric sensors can be categorized as highly sensitive and precise devices with series inconsiderable benefits from the possibility of using standard telecommunication fibers. They can be measured even small changes in the deformation of shapes in time, changes in temperature, pressure, voltage, vibration, electric field, etc. The basic idea, which is described in this article is the usage of the interferometer as a security and monitoring component, which offers a solution for securing of closed spaces, especially before unwanted entries. Its primary task is to detect intrusions - disrupting the integrity of the transparent window area due to vibration response. The base of the solution is a Mach-Zehnder interferometer, which consists of two arms in the power distribution ratio of 1:1, consisting of the SM optical fiber excited by a DFB laser. The interferometer is working on the wavelength of 1550 nm. The resulting signal is registered as a result of interference of optical beams from the reference and sensor arm. Realized measuring scheme was terminated optical receiver comprising PbSe detector. Below described experimental measurements have shown that implemented interferometer has a sufficient value of the signal to noise ratio (SNR) and is able to detect very weak signals in a wide frequency range from tens of Hz to kHz units. The signal was processed by applications developed for the amplitude-frequency spectrum. Evaluated was the maximum amplitude of the signal and compared to the noise. The results were verified by retesting the assembled prototype.

Paper Details

Date Published: 29 April 2016
PDF: 9 pages
Proc. SPIE 9899, Optical Sensing and Detection IV, 989930 (29 April 2016); doi: 10.1117/12.2231089
Show Author Affiliations
Jan Nedoma, VŠB-Technical Univ. of Ostrava (Czech Republic)
Ondrej Zboril, VŠB-Technical Univ. of Ostrava (Czech Republic)
Marcel Fajkus, VŠB-Technical Univ. of Ostrava (Czech Republic)
Jakub Cubik, VŠB-Technical Univ. of Ostrava (Czech Republic)
Petr Zavodny, VŠB-Technical Univ. of Ostrava (Czech Republic)
Martin Novak, VŠB-Technical Univ. of Ostrava (Czech Republic)
Lukas Bednarek, VŠB-Technical Univ. of Ostrava (Czech Republic)
Radek Martinek, VŠB-Technical Univ. of Ostrava (Czech Republic)
Vladimir Vasinek, VŠB-Technical Univ. of Ostrava (Czech Republic)

Published in SPIE Proceedings Vol. 9899:
Optical Sensing and Detection IV
Francis Berghmans; Anna G. Mignani, Editor(s)

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