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分析了超声波颗粒监测中探头聚焦的必要性，并介绍了与聚焦探头有关的聚焦参数（Ｆｚ，Ｂｗ）的理论确定方法。
The necessity of probe focusing in ultrasonic particle monitoring is analyzed, and the theoretical determination method of focusing parameters (Fz, Bw) related to focusing probe is introduced.