基于40kHz超声波测距系统的设计

摘要

In the ultrasonic ranging technology,ultrasonic waves are too high in frequency,attenua tion faster,impact measurement range; ultrasonic frequency is too low,affected by the outside noise interference is greater,low measurement accuracy.In order to avoid this problem,the system adopts 40 kHz ultrasonic 8 ～ 16 pulse group,with CX20106A integrated chip as the receiving circuit.The hardware used AT89C51 microcontroller as a signal control and processing circuit,the software adopts C language program.The test results show that:the ranging system within the range of 0.05～3 m,the relative error is less than 3％.Can be used in high precision in the environment.%在超声波测距技术中,超声波频率太高,衰减越快,影响测量范围;超声波频率太低,受外界杂音干扰越大,测量精度降低.为了避免这一问题,系统采用40kHz的超声波8～16个脉冲群,以CX20106A集成芯片作为接收电路.硬件采用单片机AT89C51作为信号控制与处理电路,软件采用C语言程序.经测试表明,测距系统范围为0.05～3m,相对对误差小于3％.可在测量精度较高的环境中应用.