Research On Underwater Air-to-air Imaging Technology Based On Ripple Sensor

The traditional periscope uses the reflection principle of the plane mirror on the light.The human eye observes underwater in real time and the other end is completely exposed above the water surface,thus losing its concealment.Since the beginning of the study of this imaging technology in the 1990 s,there has been a breakthrough in the loss of concealment.Corrugated sensor is a new type of observation technology equipment.The device is completely immersed in the water to observe the target,also known as virtual periscope technology.The basic principle is based on the refraction principle of light,reconstructing the distribution of ripples.The target completely immersed in the underwater observation surface will cause image distortion due to the random fluctuation of the surface ripples.The distribution of the reconstructed ripples is to complete the correction of the distorted image and restore the true appearance.This paper starts from the working principle of the corrugated sensor and discusses its theoretical basis.First,according to the known geographical information,the known direction of the incident direction of the sun light is determined.The light passes through the water surface and reaches the corrugated sensor.The aperture array plate of the corrugated sensor is transmitted to the diffuser plate to form a light spot,according to the position of the light spot and the small hole.The information determines the direction of refraction of light in water.The normal vector distribution of the surface ripples and the reconstructed ripples are determined by the direction of incidence and the direction of refraction.The ripple is rebuilt for subsequent image correction.Then,based on the working principle of the corrugated sensor,the actual system setup was started,the structural parameters of the corresponding camera,aperture array,and imaging plate were selected,and the actual corrugation reconstruction experiment was started.In addition,the calibration principle of the camera parameters to be used for the reconstruction of the corrugation distribution is also improved and calculated according to the deficiencies of the calibration methods in the literature.According to the incident rays of the sun at different time periods,the corresponding elevation and azimuth angles are calculated.Compare with the actual virtual planetarium simulation software to verify the feasibility of the calculation.Finally,this paper puts forward its own opinion on the possible problems of the imaging technology.