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在具有超声波测距功能的仪器设备中,用于驱动超声波发射及接收的电路设计种类较多。从产品的成本及体积考虑,多数采用集收发于一体的超声波换能器,采用这种设计的产品,其款式和价格都具有一定的优势。但在电路设计方面需要更高的要求,在发射时发射电路不能破坏接收电路,接受电路也不能影响发射;在接收信号时,由于信号较弱,应尽量减少由发射电路所造成的对信号的损耗。我们所设计的电路如附图所示,试验效果良好。
In the ultrasonic ranging function of equipment, used to drive ultrasonic transmitter and receiver circuit design more types. From the cost of the product and size considerations, most of the use of ultrasonic transducer set in one transceiver, using this design of the product, its style and price have some advantages. However, the circuit design requires a higher requirement, the launch of the transmission circuit can not damage the receiving circuit, the receiving circuit can not affect the launch; received signal, due to the weak signal, should be caused by the transmission circuit caused by the signal loss. We designed the circuit shown in the figure, the test results are good.