BUBBLE DETECTION METHOD AND BUBBLE DETECTION DEVICE

To provide a bubble detection method and a bubble detection device capable of quantitatively detecting mixing of bubbles into a fluid flowing through a pipe in real time.SOLUTION: A bubble detection method for detecting mixing of bubbles into a fluid flowing through piping includes the steps of: measuring flow rates by a propagation time difference type ultrasonic flowmeter installed at least on an inlet side and an outlet side of the piping; calculating normal flow rates that are not affected by the bubbles of the fluid flowing through the piping from the flow rates; calculating a difference between an inlet side normal flow rate and an outlet side normal flow rate among the normal flow rates; and determining that bubbles are mixed into the fluid flowing through the piping from the difference and estimating an amount of the mixed bubbles.SELECTED DRAWING: Figure 3 【課題】配管を通流する流体への気泡の混入をリアルタイムに、かつ定量的に検知できる気泡検知方法および気泡検知装置を提供する。【解決手段】配管内を通流する流体への気泡の混入を検知する気泡検知方法は、少なくとも前記配管の入側と出側に設置された伝搬時間差式の超音波流量計により流量を計測する工程と、流量から配管を通流する流体の気泡に影響されない正常流量を演算する工程と、正常流量のうち、入側の正常流量と出側の正常流量の差分を演算する工程と、差分から配管を通流する流体へ気泡が混入したことを判定するとともに混入した気泡の量を推定する工程とを有する。【選択図】図３