Flow detection plays important roles in industrial manufacturing and scientific research. In this work, a liquid-solid contact-electrification waveform coupling method is demonstrated. A Venturi-type triboelectric flow sensor (VTTFS) is reported, which mainly consists of a Venturi tube and a U-tube filled with liquid solution. Multiple copper electrodes are evenly distributed on the left-hand tube (LT) and right-hand tube (RT) of the U-tube with a specific phase difference. Therefore, with the flow changing, the liquid in the U-tube appears alternately among the electrodes and electrode gaps of the LT and the RT which constitute two circuits of the VTTFS. Specifically, when the left-hand circuit and right-hand circuit are coupled, the VTTFS can generate a series of sawtooth signals. The features of flow can be demonstrated through counting the pulses induced by the VTTFS and identifying the trends of the pulse signals, and the flow from 95 L/min to 215 L/min is effectively detected on base of the pulse numbers. This work provides a novel waveform coupling method for flow sensing. Besides, it can also be expanded to practical applications of triboelectric nanogenerators to the industrial manufacture, pipeline transportation, and medical health fields.

流量检测在工业制造和科学研究中起着重要作用。在这项工作中，对液固接触带电波形耦合方法进行了说明。据报道，文丘里式摩擦电流量传感器（VTTFS）主要由文丘里管和装满液体的U型管组成。多个铜电极以特定的相位差均匀分布在U型管的左管（LT）和右管（RT）上。因此，随着流量的变化，U形管中的液体在构成VTTFS的两个回路的LT和RT的电极和电极间隙之间交替出现。具体地，当左手电路和右手电路耦合时，VTTFS可以生成一系列锯齿信号。可以通过对VTTFS感应的脉冲进行计数并识别脉冲信号的趋势来证明流量的特征，并根据脉冲数有效地检测出从95 L / min到215 L / min的流量。这项工作为流量传感提供了一种新颖的波形耦合方法。此外，它还可以扩展到摩擦电纳米发电机的实际应用中，用于工业制造，管道运输和医疗卫生领域。