Dual Beam Laser Interferometer
Research Project 2009-2011
In this study, a unique dual beam laser interferometer capable of detecting sound through solid resonant media has been developed. The system detects the vibrations of a specular surface induced by acoustic frequencies in the spoken register by using laser interferometry for real-time reproduction of the audio signal over large ranges. The system utilizes a unique optical configuration and conventional signal processing techniques to increase the signal to noise ratio, sensitivity, and range of the interferometer. The configuration allows for a clear and distinctive interference fringe pattern at greater than normal range. Numerical calculations, simulations, and experimental results verify the feasibility and applicability of this novel interferometer.