A Method of Passivating Aberrations in Conformal Optical Systems Based on Wavefront Coding

Abstract

The invention discloses a method for passivating the aberration of a conformal optical system based on wavefront coding. The method includes the following steps that: an odd-symmetry phase mask plate is additionally installed at the diaphragm of the conformal optical system; the wavefront of the optical system is modulated; a coded image is formed on a detector; and image decoding processing is performed on the coded image by means of a digital filtering means, so that a final clear image can be obtained. Since a wavefront coding technique is introduced, a larger focal depth can be realized with the luminous flux and imaging resolution of the conformal optical system ensured, and astigmatism, spherical aberration, chromatic aberration, and aberration caused by defocusing which is further caused by installation error and temperature change can be suppressed. The method of the invention is simple to operate. With the method adopted, under a condition that the complexity of the conformal optical system is not increased, aberration can be passivated, and image quality can be improved, and therefore, the capture performance and tracking precision of a seeker can be improved.

Description

technical field [0001] The invention relates to a method for correcting the aberration of a conformal optical system by means of computational optics, in particular to a method for correcting the aberration of a conformal optical system by using wavefront coding imaging technology. Background technique [0002] The conformal fairing has an excellent aerodynamic shape. Although it can improve the aerodynamic performance of the missile, it is at the expense of the imaging quality of the optical seeker. The image quality is directly related to the capture performance and tracking accuracy of the seeker. Since the conformal dome is in different target fields of view, the system loses its rotational symmetry, thus introducing a large number of dynamic aberrations that change with the target field of view. It is necessary to introduce an aberration compensation mechanism to improve image quality and correct optical aberrations. The problem needs to be solved urgently. [0003] H...

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Problems solved by technology

Since the conformal dome is in different target fields of view, the system loses its rotational symmetry, thus introducing a large number of dynamic aberrations that change with the target field of view. It is necessary to introduce an aberration compensation mechanism to improve image quality and correct optical aberrations. problem to be solved

[0003] However, the traditional methods of correcting the aberrations of conformal optical systems have their own limitations: fixed aberration correctors are not ideal for aberration correction of conformal optical systems with large apertures and large fields of view; dynamic aberration correctors introduce Additional mechanical and electronic components lead to increased weight and volume of the seeker, complex system structure, and reduced working stability

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