Adaptive optics (AO) is widely used in the fields of ground-based telescopes, biological imaging, human eye aberration correction and laser communication to correct wavefront distortion. One of the key components of an AO system is a wavefront sensor (WFS). We demonstrate a 1×19 photonic lantern to be used as a single-aperture wavefront WFS. By detecting the power and the phase difference of 19 fundamental mode output at the single mode end of the photonic lantern, the lowest 19 order Zernike coefficients of the wavefront to be measured is determined. Simulation results show that when the wavefront distortion RMS< 1.5 π, the residual RMS between the reconstructed wavefront and the wavefront to be measured is always lower than 3.5 × 10−3 π, which provides a reliable technical means for realizing high-speed high accuracy and perfect common path wavefront sensing in AO system.
Unlike traditional optical cameras, Event Cameras are a new type of neuromorphic vision sensors which generate asynchronous streams of events in response to changes in log-illumination at each pixel. These devices are, therefore, extremely fast, allow for imaging while the device is moving, and enable low-power space imaging equally well during daytime as well as night. It can compensate for the limitations of optical equipment detection and meet the current space object detection requirements. Based on the background of space object detection and the optical observation technology of event cameras, the research status and several future development trends of event-based space object detection methods are summarized and reviewed. Firstly, the basic principle of event cameras and the advantages and disadvantages of their application in the aerospace field are described. Then the technical development of event cameras in space object detection, recognition and tracking are introduced. Finally, the development direction of event cameras in space object detection is discussed.
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