Study the effect of fiber-dia on the alongside dual-plastic optical fiber vibration sensor

Abstract

An alongside dual-plastic optical fiber vibration sensor is designed based on the reflection intensity modulation and study the effect of transmitting fiber (TF) and receiving fiber (RF) diameter on the sensor response is studied. Three fibers of 0.75, 1 and 1.5 mm diameter are chosen with nine pair combinations for vibration measurement. From displacement response, it is observed that the sensitivity of the sensor increases as the diameter of the RF decreases and vice versa. The test results show that the frequency range increases when the RF diameter is less than the TF and vice versa. The resolution of the sensor also increases when the difference in diameters of the TF and RF decreases and vice versa. Moreover it is evident from the results that the dynamic range, range of frequency can be optimized by choosing the suitable diameter of the TF or RF as for the application.