Mouser offers inventory, pricing, & datasheets for Reflective Fiber Optic Sensors. A fiberoptic sensor that uses diverse fiber units to support various applications in virtually any environment. These are reliable and easy-to-use devices that have high power, can automatically adjust to real-time conditions, and have a straightforward display that eliminates any guesswork. Detection in Narrow Locations The small sensing section and flexible Fiber Unit cable enable a Fiber Sensor to. A fiber optic sensor measures a physical quantity by modulating the intensity, spectrum, phase, or polarization of light traveling through the optical fiber system.