Ultrasonic sensors are using in many fields because these can easily detect the obstacle. An accuracy of sensors, however, is affected by the disturbance of the environment such as temperature and wind. In order to evaluate the reliability of ultrasonic sensor, this report shows the calculating result in an acoustic field by FDTD (Finite Difference time domain) method. It is also shown the received waveform as a function of obstacle's height to obtain the influence of temperature.
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