The Wide Range Ultrasonic Range Finder to Detect Objects

2013 Transactions of the Society of Instrument and Control Engineers  
An ultrasonic range finger that an autonomous robot is equipped with is required to find landmarks at a long distance for navigation, and to detect objects at a short distance for obstacle avoidance. Especially, it is very important to detect an obstacle at a very short distance that has the high danger of a collision. But it is difficult to detect the obstacle at a very short distance using conventional long-range ultrasonic range finders. Because the conventional finders receive a directly
more » ... nsmitted wave and a reflected wave by the obstacle at same time. This paper shows the theoretical and experimental results about wide-range ultrasonic range finders that are able to measure both short range and long range.
doi:10.9746/sicetr.49.505 fatcat:2wrtrjycajgc3eaw37xize26mu