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Event-based image sensors respond to the brightness changes in the scene; they operate differently than traditional frame-based sensors, as they only detect changes rather than registering the overall illumination during a fixed exposure time. These sensors produce an asynchronous stream of spatial-temporal events data, which includes information on the location, timestamp, and polarity of triggered events (positive vs negative change). Compared to frame-based sensors, event-based sensors offer benefits such as high temporal resolution, low latency, high dynamic range, and low power consumption. The use of event-based cameras has been explored in the fields of computer vision, navigation, and space situational awareness applications; however, their potential in Adaptive Optics and wavefront sensing has not been thoroughly investigated. We will present the modelling and preliminary experimental results of a Shack-Hartmann tip-tilt wavefront sensor equipped with an event-based detector, demonstrating its ability to estimate spot displacement with remarkable speed and sensitivity in low-light conditions.
