Far Distance Measurement Based on Flexural Vibration Ultrasonic Sensors
Zeng Ying-sheng · Microcomputer Information · 2008
The real-time detection of obstacle in unknown circumstance is a key navigation technology of Autonomous Land Vehicle (Outdoor Mobile Robot). Compared with other sensors, the ultrasonic sensor for circumstance detection has the advantage of low cost, easy installation and recognition of obstacle in dark environments, so it can be used for Distance Measurement in Robot system. However, due to the short effective distance, the ultrasonic sensor is merely used for short distance measurement on a slowly moving robot in a static circumstance, which cannot be used as an anterior sensor for high speed Autonomous Land Vehicle. A long distance measurement ultrasonic sensor with high power and low frequency is presented, of which the beam angle is 9, and the maximal dis-tance is over 35m. The novel sensor can detect the object in the far distance for fast moving Autonomous Land Vehicle.