Optical Tachometer
EEE
optical tachometer measures the speed of a rotating object using a laser beam. The laser reflects off a marked or reflective tape on the object, returning to the sensor. By counting these reflections, the tachometer determines the rotations per minute (RPM).
Working Principle:
Laser Emission: A laser beam is directed from the tachometer sensor toward the rotating object.
Reflective Tape: A special reflective tape on the object reflects the laser light.
Light Reflection: Each rotation brings the tape into the laser beam, sending reflected light back to the sensor.
Sensor Detection: The tachometer’s photodetector receives the reflected light.
Pulse Generation: Each reflection generates an electrical pulse.
Speed Calculation: By counting the pulses over a set time, the tachometer calculates the object’s RPM.
Tags: Optical Tachometer is a device used to measure the rotational speed