超聲波明渠流量計直接測量的物理量是液位。用于明渠測流量時，在明渠上安裝量水堰槽。量水堰槽把明渠內流量的大小轉成液位高低。儀表測量量水堰槽內的水位，再按相應量水堰槽的水位流量關系反算出流量.普通明渠內流量與水位之間的對應關系，受渠道的坡降比和表面糙度影響。在渠道內安裝量水堰槽，產生節流作用，使明渠內的流量與液位有固定的對應關系。這種對應關系主要取決于量水堰槽的構造尺寸，渠道的影響減至最小。 &nbs
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