Fiber optic interferometer as a security element

Jan Nedoma; Ondrej Zboril; Marcel Fajkus; Jakub Cubik; Petr Zavodny; Martin Novak; Lukas Bednarek; Radek Martinek; Vladimir Vasinek

doi:10.1117/12.2231089

29 April 2016 Fiber optic interferometer as a security element

Jan Nedoma, Ondrej Zboril, Marcel Fajkus, Jakub Cubik, Petr Zavodny, Martin Novak, Lukas Bednarek, Radek Martinek, Vladimir Vasinek

Author Affiliations +

Proceedings Volume 9899, Optical Sensing and Detection IV; 989930 (2016) https://doi.org/10.1117/12.2231089
Event: SPIE Photonics Europe, 2016, Brussels, Belgium

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.

Citation Download Citation

Jan Nedoma, Ondrej Zboril, Marcel Fajkus, Jakub Cubik, Petr Zavodny, Martin Novak, Lukas Bednarek, Radek Martinek, and Vladimir Vasinek "Fiber optic interferometer as a security element", Proc. SPIE 9899, Optical Sensing and Detection IV, 989930 (29 April 2016); https://doi.org/10.1117/12.2231089

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available