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Title: Study On Geometric Parameter Measurement And Weight Coefficient Correction Of Ultrasonic Flowmeter
Author: He-Ming Hu Tao Meng Feng Gao Liang Zhang Chi Wang
Source: Flomeko 2013
Year Published: 2013
Abstract: Geometric parameter measurement system for multi-path ultrasonic flowmeters based on Leica total station has been established, which can directly measure the 3D coordinates of the conduit points and sensor points and automatically calculate geometric parameters of the flowmeter. Compared with the traditional method using the theodolite and steel tape, the first advantage of this system is the high efficiency and good accuracy, and the second is the path heights can be re-measured after the sensor mounted. Cylinder fitting is its key problem. Lukacs algorithm is introduced for the cylinder fitting, and Monte-Carlo simulation method is introduced for its uncertainty estimation.To illustrate the rationality and validity of this measurement system, the calibration data and its uncertainty of 3 flowmeters in three gorges power station have been comparative analysed. Besides, the influences of the water temperature and pressure on the diameter of three gorges steel penstock and then on the other parameters have be estimated

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