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本文介绍我们与北京自来水公司共同研制的频差法超声流量计的原理,特点.该机采用了锁相倍频,自动增益,消除干扰和自动纠错电路,从而使该机性能稳定可靠.
This paper introduces the principle and characteristics of the frequency difference method ultrasonic flowmeter jointly developed by Beijing Waterworks Company and Beijing Water Supply Company.The machine adopts phase lock frequency doubling, automatic gain, interference elimination and automatic error correction circuit so that the performance of the machine is stable and reliable.