主权项 |
1. A flow velocity meter for measuring a speed of a current under test, comprising:
a signal generating module comprising:
a phase locked loop for generating a continuous wave signal with a first frequency; anda multiplier, electrically connected with the phase locked loop, for increasing frequency for the continuous wave signal to generate an output signal with a second frequency and for emitting the output signal to the current under test; a signal receiving module for receiving a reflecting signal with a third frequency from the current under test; an inclinometer for measuring a depression angle and a horizontal angle of the flow velocity meter; and a signal processing module, electrically connected to the signal receiving module and the inclinometer, for calculating the speed of the current under test according to a difference between the third and the second frequencies, the depression angle and the horizontal angle. |