用于呼吸测量的超声旋涡流量计研制

The development of an ultrasound vortex flowmeter for respiratory measurement

本文根据ｋａｒｍａｎ旋涡的理论研制了超声旋涡流量计，它由超声发射器、超声旋涡传感器、超声接受器、检波器、放大器和Ｓｃｈｍｉｔｔ触发器等部分组成，其输出是方波信号。该流量计可以测量１３．８～２４６３．０ｍｌ／ｓ的双向气体流量，最大流量时的压力损失不大于１．６ｋＰａ，，适用于呼吸通气功能的测定与监护。

The development of an ultrasound vottex flowmeter is carried out on the basis of var Karman vortex theory with ultrasound wave measuring vortex shedding frequence(VSF).It is composed of ultrasound transmitter,ultrasound vortex sensor,ultrasound receiver,detector,amplifier,and Schmitt flipflop.There is an output with square wave from the meter,whose frequency is just VSF.The flowmeter can measure double direction of gas.Its range is 13.8-2463.0ml/s,and peressure loss is 1.6KPa when the flow has reached maximum value.It can be used to measure and to monitor the respiratory function of human or animal.