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.
