Reflective intensity-modulated fiber optic sensor (RIM-FOS) are widely used for such physical parameters measurements as distance, vibration, sound, pressure, temperature and acceleration because of their advantages over other fiber sensor, including simple structure . Reflective intensity-modulated fiber optic sensor (RIM-FOS) are widely used for such physical parameters measurements as distance, vibration, sound, pressure, temperature and acceleration because of their advantages over other fiber sensor, including simple structure . A reflective intensity-modulated fiber-optic sensor based on microelectromechanical systems (MEMS) for pressure measurements is proposed and experimentally demonstrated. The sensor consists of two multimode optical fibers with a spherical end, a quartz tube with dual holes, a silicon sensitive. Optical fiber sensors (OFSs) have emerged as essential tools in the monitoring of physical, chemical, and bio-medical parameters in harsh situations due to their high sensitivity, electromagnetic interference (EMI) immunity, and long-term stability. However, the current literature contains. Abstract: Compare with traditional way of numerical simulation by establishing the mathematical model through geometry optic, we design a TracePro model to analyze the sensing process of reflective intensity-modulated fiber optic sensor base on ray tracing. This type of sensor has advantages over. A Fiber Sensor is a type of Photoelectric Sensor that enables detection of objects in narrow locations by transmitting light from a Fiber Amplifier Unit with a Fiber Unit. Light Transmission: This light travels down one or more optical fibers.