Design and fabrication of ultrasonic systems for sediment concentration measurement and application of power law for calibration of multi-radius solutions
Date Issued
2009
Date
2009
Author(s)
Huang, Wen-Yin
Abstract
Multiphase suspension systems are extensively used in hydrology, biochemistry, and the food industry. Ultrasonic spectroscopy is a rapid, on-line, non-invasive measurement technique for suspension characterization of different particle sizes and wide-ranging concentrations. In this thesis, three types of measurement systems have been developed and manufactured through the collaboration of our Lab, Hydrotech Research Institute, NTU, and Broadsound Corporation. The systems employ the launch, transmission, and reception of ultrasound signal in the liquid solution and the signal attenuation in the solution provides the systems the capability of real-time particle concentration measurement.esides, the power law was also introduced in this paper to simplify system calibration for concentration versus attenuation. For different samples, the calibration results obtained by the power law are still valid while changing frequency and distant between probes. Once the function of power law for specific sample is experimentally determine, we can predict the sediment concentration only by calibrating pure water.ive samples, reservoir sediments, Kaolin, silica powder, quartz sand, and compose samples, were experimentally investigated. The operated ultrasonic frequencies were 1MHz, 3MHz, 5MHz and 10MHz, respectively. The repeatability and accuracy of power law function was confirmed by varying the distance between probes. The ultrasonic measurement systems have been employed successfully in the Shihmen and Tsengwen reservoirs during several typhoons in 2008.he results show that the power law obtains very good regression functions. The developed ultrasonic systems were verified through laboratory experiments and demonstrated that the overall error is within 5% through the field measurements in typhoons in 2008.
Subjects
Ultrasonic measurement
concentration
power law
Type
thesis
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