Design and Implementation of Rotation Speed Sensing System Using Diode Laser 671 nm

Abstract

This study aimed to design and implement a rotation speed sensor by using diode laser (671 nm, 50 mW). The system is composed of photodetector received the laser light signal as pulses because of the use of disk plate (with one hole) which is welded to the motor shaft. The photodetector output signal had been modulated by a microcontroller which itself programmed by C Language to translate each pulse as one revolution per minute (rpm). The designed sensor was operated to measure different rotation speed and it showed very accurate results and high efficiency compared with the Tachometer. The comparison showed, also that the implemented sensor was easy to use, very fast and can be used in some fields specially in the field of power generation stations in order to measure the speed of the rotating shaft with bigger diameter and with high accuracy.