Design of widescope speed measuring system

LI Han, MI Zhihong, LIN Chunxi
（Department of Marine Engineering, Guangzhou Maritime College, Gaungzhou 510725, China)

Abstract: In order to solve the problems of the inaccuracy at lower speed and poor performance in real time due to the great interruption at higher speed in the widescope speed measurement system of optical encoder, a method of vibrationproof M/T speed measurement combined with presettable dividebyN counter was introduced. In this method, impulse level logic filtering was adopted and the counting was achieved by dividing the higher frequency, thus improving the accuracy at a lower speed and efficiency at a higher speed by decreasing the times of interrupt processing. Based on this method, a widescope speed measurement with a 32bit embedded processor (LPC2114) as its controller has also been developed while the hardware and software of this system were also provided. The results indicate that this method is effective.
Key words: optical encoder; widescope speed measurement; dividebyN counter