Fiber Optic Interferometric Method for Registration of IR Radiation

Abstract

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