Pulsed LED Strobe Synchronization under Rolling Shutter Global Overlap Windows
Pulsed LED strobes require exposure durations exceeding total sensor line readout time to establish a uniform global overlap window for artifact-free imaging.
Strobe Controller
Pulse Width
Timing modules regulate the duration and intensity of light pulses used in machine vision systems. A strobe controller synchronizes the illumination with the camera shutter to capture sharp images of objects moving at high velocity. This device prevents motion blur by providing a very high intensity burst of light for a few microseconds.
Trigger Input
Signals from encoders or proximity sensors tell the controller exactly when to fire the light. Minimal latency between the trigger and the flash is necessary to ensure the object is in the center of the frame. Some systems use an internal delay to compensate for the physical distance between the sensor and the camera.
Thermal Protection
Frequent high current pulses generate significant heat within the lighting assembly. The controller monitors the duty cycle and limits the firing rate if the temperature exceeds a safe threshold. This prevents the LEDs from degrading and ensures the light output remains consistent over time.
Illumination Intensity
Short pulses require a high current to be delivered to the LED or xenon lamp in a very short time. Modern controllers allow for nanosecond resolution in setting the pulse length to match the process speed. Increasing the current beyond the continuous rating is possible because of the very low duty cycle.
Precise control over the light output ensures stable measurement results.