Direction Estimation of Sound Source using an Array of Two Optical Mach-Zehnder Interferometers Based on Acousto-Optic Sensing
In this paper, direction estimation to sound source using an array of two optical fiber sensors based on time difference of arrival is introduced. The sensor array consists of two Mach-Zehnder interferometers including an acousto-optic sensor for each one. The direction estimations for two cases of direction, one about 1.5 m apart from the center of the array and the other about same length apart from a corner of the array, are performed to gunshot sound signal. Estimation lines appeared in speaker range, respectively, compared with the ideal values in free sound field and anechoic condition.
Keywords - Optical microphone, array of sensors, direction estimation of sound source, optical interferometry