Abstract: A device for measuring a surface speed and a liquid level of a fluid is disclosed. The device includes a RF transceiving module for alternatively transmitting a first FMCW signal and a first CW signal to the fluid, and receiving a second FMCW signal and a second CW signal reflected from the fluid. A processor is used for calculating the liquid level of the fluid based on a frequency difference between the first FMCW signal and the second FMCW signal, and for calculating the surface speed of the fluid based on a frequency difference between the first CW signal and the second CW signal. Since the device integrates functions of measuring the surface speed and the liquid level of a fluid, it reduces an occupied room and facilitates a synchronization of data transmission.

Abstract: A flow velocity meter is disclosed. The flow velocity meter utilizes a phase locked loop to generate an output signal and outputs the output signal to a current under test. The flow velocity meter receives a reflection signal from the current under test to calculate a speed of the current under test according to a reflection signal and a frequency difference between the output signal and the reflection signal. The flow velocity meter further includes an inclinometer for measuring a depression angle between a water level and a normal direction of the flow velocity meter and measuring a horizontal angle. The flow velocity meter can be adjusted its orientation when being installed according to the measured angles.

Abstract: A flow velocity meter is disclosed. The flow velocity meter utilizes a phase locked loop to generate an output signal and outputs the output signal to a current under test. The flow velocity meter receives a reflection signal from the current under test to calculate a speed of the current under test according to a reflection signal and a frequency difference between the output signal and the reflection signal. The flow velocity meter further includes an inclinometer for measuring a depression angle between a water level and a normal direction of the flow velocity meter and measuring a horizontal angle. The flow velocity meter can be adjusted its orientation when being installed according to the measured angles.