Study the effect of different vibration levels on the Laser Speckle Pattern Using the Walsh Transform

Abstract

The speckle pattern of the laser interference spots of a multimode optical fiber was studied after shedding vibrations of different intensity by means of the Welch Transformation, which has the advantage of having its basic functions square in the shape of different frequencies. The results were compared with Fourier transformation, where the total frequency difference pattern, its total amount, and the time consumed in the calculation were compared, the results were discussed with recommendations.