This paper analyses measurement demands of velocity instrument method, spot location's choose, tachometer perpendiculars arrangement, how to eliminate system error for human-induced factor and advance degree of preciseness of measurement result and so on.

Study on the mathematical model of the calibration system of the peak flow meter;

This paper discusses the method of overland flow velocity instrument, and a parallel multi-channel fast-data-acquisition system has been designed base on FPGA, and this system also has the independent serial communication function.

This paper introduced the flow measuring principle of time-difference method of ultrasonic flow meter and the flow calculating method in flow measurement with velocity instrument.

The error sources are analyzed in detail, and the measured results of the ultrasonic flowmeter are compared with the results of other two methods -- current meter and thin plate weir.

Several methods of approximately computing flowrate through circular crosssection by using current meter,are discussed.

This paper firstly discusses the principle and the algorithm of the flow measuring by using current meter,and the field efficiency test for hydroturbine generating unit.

Research of intelligent flow meter based on embedded microprocessor;

A portable intelligent flow meter suiting for outdoor application was presented in the paper.