Ultra-small diameter fibers with a compact head ensure precision centering accuracy to stably detect minute parts. Sensing of minute objects can be performed by combining the fiber and spot lens. 6 times longer sensing range than conventional models! Reflective type FD-R35G has been added. A fiber optic sensor and two fiber optics made of plastic or glass fibers make up a fiber optic system. The sensor contains a light source (transmitter), typically an LED, and a photodiode (receiver). The generated light is guided through an optical fiber (transmission path) to the object to be. Facultad de Ingeniería y Ciencias, Universidad Autónoma de Tamaulipas, Centro Universitario Victoria, Ciudad Victoria 87149, Tamaulipas, Mexico Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), División de Física Aplicada-Departamento de Óptica, Carretera. Jose Miguel Lopez-Higuera: Handbook of Optical Fiber Sensing Technology, John Wiley & Sons, 2002. Radiation absorption creates electronic excited states that are trapped by localized defects for extended periods of. *2 The minimum detectable object is the value when the detecting distance and sensitivity have been set to their optimal state.