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现在有个问题,我拆了一个采用折射镜的水表,用它的折射水管和换能器,用demo板采集的波形是乱的,不管怎么改adc的延迟,波形变化不大,总是跳变到一个固定的幅度波动,但是单独把换能器拿出来放在水里对射,demo板采集的波形就是完好的。所以这是正常的?