Novel shear beam imaging system and target image acquisition method

Abstract

The invention discloses a novel shear beam imaging system and a target image acquisition method. The novel shear beam imaging system applies a Fourier phase extraction technology to a traditional shear beam imaging technology, so that it becomes possible to remove the two steps of beam frequency shift and fringe demodulation in the traditional shear beam imaging system, the structure of the shearbeam imaging system is simplified, the imaging signal-to-noise ratio is improved, and the complexity of an image reconstruction algorithm is reduced. Moreover, the performance of the shear beam imaging system is greatly improved, and engineering implementation of the system is facilitated.

Description

technical field [0001] The present application relates to the field of optical imaging technology, and more specifically, to a novel sheared beam imaging system and a method for acquiring target images. Background technique [0002] The monitoring and identification technology for long-distance moving targets (such as aircraft, satellites or missiles, etc.) is of great significance to the fields of civil aviation dispatching, security early warning, military reconnaissance and other fields. The current long-distance imaging technology is mainly divided into passive long-distance imaging and active long-distance imaging. Passive long-distance imaging is a technology that uses the illumination of natural light sources to observe the detection target, and it is also the earliest imaging technology adopted. However, passive long-distance imaging has a strong dependence on environmental factors such as natural light sources, the relative position of the sun and the earth, and sk...

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Problems solved by technology

[0004] Up to now, the descriptions of the sheared beam imaging system in the published literature at home and abroad all include devices for frequency-shifting the emitted beam and demodulating the received fringe field, so as to distinguish the interference fringes contained in two orthogonal directions. The target feature information, accurately extract the phase information in two orthogonal directions, so as to achieve the purpose of reconstructing the target image; however, due to the existence of the device for frequency shifting the emitted beam and demodulating the received fringe field, the existing technology The sheared beam imaging system has the problems of relatively complex structure and low energy utilization rate of the detection laser.

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