Through introducing the principle of ultrasonic open channel flowmeter, this paper takes Parshall flume for example to describe the calibration methods, and point out the matters needing attention in the verification process.%通过介绍超声波明渠流量计的原理，以巴歇尔槽为例，简述了检定方法，指出了检定过程中的注意事项。
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