An ultrasonic shape recognition considering change of ambient atmospheric pressure

Recognition methods with an ultrasonic sensor are often utilized in situations where optical sensors cannot be used or in objects which are hard to be identified by the approach based on the light. Among ultrasonic data, an ultrasound pressure data has the advantage of being able to acquire three-dimensional shape information with high resolution and with comparative ease by use of ultrasonic sensor array. The ultrasound pressure data is vulnerable to the change of the atmosphere pressure. Therefore, this paper proposed an ultrasonic shape recognition approach considering change of ambient atmospheric pressure. We designed and built a prototype shape recognition system with ultrasound pressure. From experimental results, it was shown that the proposed approach is effective for shape recognition with ultrasound pressure data.