Bone conduction-like acoustic sensor system for evaluating crispness

In this paper, we propose a novel acoustic sensor system to evaluate crispness by focusing localization of biting sounds. and its spatial spread. By mimicking the bone conduction mechanism in humans, our system consists of (1) acrylic teeth to bite food, (2) an acrylic bone to propagate sounds (vibrations) generated by food, (3) two acoustic emission (AE) sensors to obtain the vibrations. From left and right sensor outputs, this system localizes sound sources in biting and obtains their spatial spread. Although such features have never been used to estimate texture in food, we show they clearly classify four characteristic crispy foods by experiments.