INTENSITY-BASED SELF-REFERENCING FIBER OPTIC VIBRATION SENSOR

摘要

The present invention relates to an optical fiber vibration sensor using light to measure sophisticated vibration. According to an embodiment of the present invention, the vibration sensor includes: an aperture which controls intensity of penetrated light depending on vibration of an object for measurement; a light detector which detects light of which intensity is controlled in the aperture; a signal processing unit which calculates a light attenuation rate by using reference light intensity and light intensity which is detected by the light detector and calculates a vibration rate based on the calculated light attenuation rate. The length of a first side of the aperture is longer than a diameter of the light. The length of a second side of the aperture is shorter than the diameter of the light.