Research on Linear Open Channel Current Meter Device

The linear open channel water velocity standard device uses servo motor to control and measure the speed of the test car, which makes the test car run on the track. The detecting car pulls the current meter at the speed range of (0.1–5) m/s, so that the current meter travels in still water. By measuring the speed of the detecting car and the speed of the current meter, the relative relationship between the two sets of data is established with equations or charts, so as to achieve the purpose of detecting the current meter. In this experiment, Doppler ultrasonic current meter with good accuracy and stability was used to test on the device to verify the repeatability and stability of the device, and at the same time, the device was compared with other laboratory devices to further confirm the detection ability of the device. The uncertainty of measurement results is evaluated, and the relative extended uncertainty of measurement results at the flow rate of 1.0m/s is 0.18%
$(k=2)$
, which proves that the accuracy level of the device is high.