基于弯曲振动超声换能器的远距离测量

Far Distance Measurement Based on Flexural Vibration Ultrasonic Sensors

未知环境下的实时障碍探测是陆地自主车(也称室外移动机器人)智能导航的关键技术。超声波传感器与其它环境探测传感器相比,具有价格低廉、便于安装使用且不受光线影响的优点,在国内外移动机器人测距系统中得到了广泛应用。但由于作用距离较短的原因,超声波传感器一般用于机器人低速运行在静态环境中的短距离测量,无法作为高速行驶陆地自主车的前视传感器来使用。针对这一情况,研制了一种高功率低频率的远距离超声传感器,其波束角为9,最大作用距离可超过35m,能满足高速行驶的陆地自主车进行远距离测距的要求。

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 distance is over 35m. The novel sensor can detect the object in the far distance for fast moving Autonomous Land Vehicle.