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Title: Ultrasonic Gas And Fluid Flowrate Measuring Method And System Thereof
Author: Khak Su
Source: 1999 International Symposium on Fluid Flow Measurement
Year Published: 1999
Abstract: An ultrasonic multi-channel flowrate measuring system has a bright prospect, if the gas transportation pressure loss does not occur and the calibration inspection is simple and cheap, under the conditions that the inner diameter of a gas transportation pipe becomes larger and the range of measuring the flowrate gets wider. But, under these conditions, there are problems in realizing a flowrate meter based on the traditional ultrasonic pulse transit time difference method or the phase dtierence flow velocity measuring method. The fundamentalproblem is to result from the drifi (deflection) of the ultrasonic transit due to the damping of the ultrasonic wave in gas and the larger changing width of the gas flow velocity. As the problems questioned in the paper and their resolving method, a radial ultrasonic multichannel flowrate measuring method based on a new phase difference method and a transit time difference method using a fi-equency modulated ultrasonic wave is suggested. The flow velocity measuring method is also successfidly adaptable to a liquid flowrate measurement.

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