Research on the Theory and Experimental Method of Velocity Measurement Based on Microprocessor

The muzzle velocity of the projectile is one of the important parameters for flight control of the projectile. In order to further improve. The stability and precision of the measurement of the muzzle velocity of the projectile, the relative theory of velocity measurement was studied and a new experimental method was put forward. Analysis shows that timers starts or stops timing at the zero point of the voltage signal can improve the velocity measurement accuracy. In order to solve the problem, a signal processing module was designed. The signal processing module can convert the induced voltage signal into a square wave signal. Then the DSP(Digital Signal Processor) can capture the falling edge of the square wave signal and generate interrupt timing. Thus, the timer can be accurately timed at the zero point of the induced voltage signal. In addition, the relevant theories and analysis methods of velocity measurement were established in the article. The induced voltage distribution on the axis of the excitation coil was modeled and simulated. The velocity measurement experiments are carried out by using the proposed method and the traditional pulse induction method. The comparison of experimental results shows that the test method used in this paper has a higher measurement accuracy and the relative error can be controlled within 1%. In this paper, there are some innovations in the theory of speed measurement and the experimental method of timer timing at zero induced voltage. The measurement method is of great significance in the field of velocity measurement.