Optics and Photonics Society of Iran

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In this study, sensors are used based on intensity measurements. These sensors have cheaper components, are simply fabricated and have a much higher bandwidth. The study focuses on two-fiber sensors as transmitter and receiver fibers, with a reflective target, also two fibers have angular displacement flexibility relative to the reflector. In this research, we tried to calculate numerically the output and the input powers, and the amount of the overlap area between sending and receiving fibers, then some optimal states are recognized. In intensity-based angular fiber optic displacement sensors, various factors affect the sensitivity. After simulating the sensor and checking these factors, it was found that by decreasing the diameter of the transmitter fiber, the receiver output power is increased, also the sensing range increases. By decreasing the core diameter of the sending fiber, the dead band region of the sensor is decreased. When the receiver core diameter increases, the power output of the receiver fiber increases, and the dead band region decreases.

Keywords: angular displacement, dead band region, displacement sensor, intensity measurement, Optical fiber.

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