Fiber Optic Sensor Setting Delay

Fiber optic sensor delay settings control the response time for detection, allowing you to adjust on-delay and off-delay to match your application needs.Understanding On-Delay and Off-DelayOn-Delay: This is the time interval between the sensor detecting an object and the output signal being activated. It prevents false triggering from brief or transient signals.Off-Delay: This is the time interval between the object leaving the detection area and the output signal turning off. It helps maintain signal stability when objects move quickly or intermittently. Adjusting these delays ensures accurate detection and reduces errors caused by vibration, dust, or rapid movement of workpieces .Configuring Delay on Keyence FS-N Series SensorsAccess the Delay Settings: On the FS-N11N or FS-N41P models, navigate to the amplifier settings using the and buttons .Select Delay Type: Use the menu to choose either "On Delay" or "Off Delay" depending on which response you want to adjust .Set Delay Time: Adjust the delay time using the amplifier controls. The delay is typically set in milliseconds and can be fine-tuned to match the speed of your production line or the characteristics of the detected object .Confirm Settings: After setting the desired delay, confirm and save the configuration. The sensor will now respond according to the specified timing.Calculating Optical Fiber Signal DelayFor long-distance fiber optic systems, the signal propagation delay is determined by the fiber length and refractive index. The speed of light in fiber is slower than in a vacuum due to the refractive index (typically ~1.468 for quartz fiber), resulting in a speed of about 204,000 km/s. The delay can be calculated as: Delay (seconds) = Fiber Length (km) / Speed of Light in Fiber (km/s) For example, a 100 km fiber would have a delay of approximately 0.49 milliseconds . This is important in high-speed or synchronized systems where precise timing is critical.Practical TipsUse shorter delays for fast-moving objects to avoid missed detections.Use longer delays to filter out noise or transient signals.Combine delay settings with sensitivity adjustments to optimize detection reliability in dusty or reflective environments .For networked or long-distance fiber systems, consider propagation delay in timing-critical applications to ensure synchronization . By properly configuring on-delay and off-delay, you can improve sensor accuracy, reduce false triggers, and maintain stable operation in industrial or optical communication setups.