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工业上往往需要两种和三种成份流量的检测设备。本文介绍了适合检测气体含量的超声换能器的研究。 一对超声换能器被相对地固定在流体管子的两侧。发射器是由电源的脉冲激励的,而脉冲超声束穿过发射器和接收器之间的声腔。根据单相流体冲的涡流或两相流体中的悬浮颗粒(即固/液混合物中的沙粒,气/水混合物中的气泡),可以对声束进行幅度和相位的任意调制。通过峰值探测器测量来自接收器的输出信号的峰值,并且在时间平均后,他们与非连续相的含量呈函数关系。 脉冲超声传感器与连续波超声传感器相比,主要的优点是能避免应用连续波检测时,出现在换能器之间的声腔中驻波的有害影响,因此能组成较简便和可靠的测量系统。
Industrial often requires two and three component flow testing equipment. This article describes the study of ultrasonic transducers suitable for detecting gas content. A pair of ultrasound transducers are relatively fixed on either side of the fluid tube. The transmitter is pulsed by the power supply and the pulsed ultrasound beam passes through the acoustic chamber between the transmitter and the receiver. Depending on the eddy currents of the single-phase fluid or the suspended particles in the two-phase fluid (ie, sand particles in the solid / liquid mixture, bubbles in the gas / water mixture), the amplitude and phase of the sound beam can be arbitrarily modulated. The peaks of the output signal from the receiver are measured by a peak detector, and after time averaging they are a function of the content of the discontinuous phase. The main advantage of pulsed ultrasonic sensors over continuous wave ultrasonic sensors is that they can avoid the harmful effects of standing waves in acoustic cavities between transducers when using continuous wave detection and therefore make it easier and more reliable to make measurements.