| With the global energy crisis in recent years, the traditional energy sources have been over used.A large amount of energy which are used caused pollution to the environment.So green, clean energy is developed and used by countries. In recent years, the use of wind power in field of wind power technology and meteonological field is developed quickly. Wind energy resources can not be predicted, stored and dispatched. As the randomness of the wind, the traditional mechanical wind measurement system gets large error. If using two-dimensional ultrasonic measuring system, measuring accuracy will be greatly improved. But it is limited to the horizontal direction and vertical direction of two-dimensional analysis. So three-dimensional ultrasonic measuring wind field information are adopted in this thesis. Through comparing with several methods on the ultrasonic time interval measurement method, the method of time difference measurement is selected.A3D ultrasonic measuring system is designed by a high-precision time measuring chip TDC-GP21and a SCM control chip MSP430F413. Three pairs of ultrasonic transducers are used to constitute the3D arrays and the time difference method is used for measurement. This thesis designed the overall system structure and each part of the hardware circuit.Then the thesis also designed solar and battery power supply system. Laboratory test or simulation in some parts of hardware circuits prove its feasibility.At the same time overall software of the system, software of TDC-GP21measurement system, software of clock module, software of SD card are designed. Finally, the system measurement of deviation and how to calibrate are analyzed in detail. |
