The Design And Application Of Fiber-optic Compound Eye

The compound eye of insects in nature have many advantages,including the wide field of view(FOV),high sensitivity to moving objects,and compact structure.Directional navigation is one of the important features of compound eye,which is able to quickly and accurately determine the orientation of an objects.Therefore,bionic curved compound eye has great potential in detecting the orientation of the target.At present,bionic curved compound eye still has great difficulties in target detection.It is difficult to collect accurate and distortion-free information,and there is a serious non-linear relationship between the orientation of the target and the image obtained by the curved compound eye in wide FOV.The existing bionic curved compound eye system have only provided qualitatively analyses of target orientation detection,and there is no more appropriate calibration and detection method.In this paper,inspired by the structural characteristics of the of bee's compound eye,a fiber-optic compound eye similar to the compound eye of bee is developed and fabricated.In the fiber-optic compound eye,we use optical fiber as its relay system,which fully utilizes the transmission characteristics and flexibility of optical fiber.The use of optical fiber solves the problem of incompatibility between the curved imaging surface and the planar sensor,which ensures that no interference occurs in information transmission and crosstalk between sub-eyes is also avoided.These advantages of fiber-optic compound eye ensure the accuracy of the information,which provides important prerequisites for the subsequent target detection.There is a serious non-linear relationship between the orientation of the target and the image obtained by the curved compound eye,and an effective model needs to be established to detect the orientation of target.We use a method for detecting the orientation of the target,which combines the virtual cylinder target with the neural network.This method can establish an mapping relationship between the acquired image and the direction of the target.In the calibration process,the method calibrates the curved compound eye as a whole instead of calibrating all the sub-eyes.Therefore,it is not necessary to have accurate knowledge of the relative positions and axial directions among the sub-eyes.These advantages effectively reduce calibration error and make the calibration process more concise,and they thereby help to improve the accuracy of target orientation detection,and the method is scaleable for compound eye systems with variable sub-eyes.To verify the feasibility of the method,a calibration system platform was built according to the calibration method to carry out calibration experiments.The verification experiments show that the method used in this paper can use fiber-optic compound eyes to achieve quantitative detection of direction.Therefore,it has great application potential in target detection and tracking,UAV obstacle avoidance,directional navigation control,etc.