Resolution-Improved Optical Beamformer With a Multiple Line Array Sensor Structure For the Direction Detection of Low Frequency Acoustic Wave
To find the origin of acoustic signal, an array type of sensors is necessary, but this array structure accompanies spatial aliasing problem by the finite and discrete number of sensors. This problem can be overcome by using acousto-optic beamforming. For low frequency (< 1 kHz) application, conventional one-dimensional beamforming needs a long beam path. In this paper, two-dimensional beamforming using a multiple line array structure is proposed to improve direction resolution in low frequency range. Its resolution performance is compared through simulation with that of one-dimensional beamforming.
Keywords- Two-dimensional beamforming, Acousto-optic sensing,