"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Registration of low intensity IR radiation using modal interference in an optical fiber

I. CULEAC1,* , I. NISTOR1, M. IOVU1, A. ANDRIESH1

Affiliation

  1. Institute of Applied Physics of the Academy of Sciences of Moldova, No 5 Academiei Str., MD-2028 Chisinau, Republic of Moldova

Abstract

A high sensitivity fiber-optic method for registration of low intensity IR radiation is proposed. The method is based on the effect of variation of the speckle pattern in the far-field of a multimode fiber. IR radiation that falls on a lateral surface of the fiber leads to variation of the speckle image. Computer processing of the speckle image provides information on the amplitude of the perturbation that hits the fiber. An algorithm has been developed for processing of the speckle image and determining of the intensity of IR radiation. The results of computer simulation correlate sufficiently well with experimental ones..

Keywords

multimode fiber, speckle pattern, modal interference, CCD, IR radiation..

Submitted at: July 5, 2009
Accepted at: Dec. 10, 2009

Citation

I. CULEAC, I. NISTOR, M. IOVU, A. ANDRIESH, Registration of low intensity IR radiation using modal interference in an optical fiber, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 12, pp. 1954-1958 (2009)