A variable resolution non-scanning streak tube laser imaging system with large field of view and large depth of field

Abstract

The invention relates to a wide-field-of-view and large-depth-of-field variable-resolution non-scanning streak tube laser imaging system, and belongs to the technical field of photoelectric imaging. The system mainly comprises a pulse laser, transmitting and receiving optical systems, a reflecting mirror, a micro-lens array, an optical fiber image bundle, streak tubes I / II, CCD cameras I / II and a control and processing system. The basic principle is that the pulse laser emits laser pulses, the laser irradiates to a target object through the transmitting optical system and the reflecting mirror, and the reflected laser is received by the receiving optical system and forms an image on the micro-lens array. The image plane is non-uniformly sampled by the micro-lens array and the optical fiber image bundle and then coupled to the photoelectric cathodes of the two streak tubes, the two CCD cameras acquire the streak image on two fluorescent screens and transmit the streak image to the control and processing system, and finally the intensity image and the distance image of the target can be obtained through the algorithm. The contradiction among the high spatial resolution, long distance detection, wide field of view and large depth of field of the non-scanning streak tube laser imaging radar can be solved.

Description

technical field [0001] The invention relates to a variable-resolution non-scanning streak tube laser imaging system with a large field of view and a large depth of field, and belongs to the technical field of photoelectric imaging. Background technique [0002] The streak tube laser imaging radar is a new system of laser imaging radar that appeared at the end of the last century. It can be divided into two imaging mechanisms: scanning and non-scanning. Compared with the traditional point-scanning lidar, it has technical advantages such as high precision and high frame rate, and is an effective means to quickly obtain target intensity and distance information. After more than ten years of research, streak tube laser imaging radar has developed a variety of imaging methods such as single slit, multiple slits, and polarization. Foreign research institutions have successfully developed a variety of streak tube lidar systems, which have been successfully applied to mine reconnai...

AI Technical Summary

Problems solved by technology

For non-scanning streak tube laser imaging radar, in order to pursue high spatial resolution, optical fibers with smaller diameters need to be used in the image plane of the receiving optical system, and the reduction of the diameter of the optical fibers will result in the laser echo energy received by each optical fiber The reduction of the laser echo energy will reduce the detection distance of the laser radar system

In order to pursue a large field of view, more optical fibers need to be included in the optical fiber conversion system, and the increase in the number of optical fibers will inevitably reduce the vertical range corresponding to each optical fiber on the fluorescent screen of the stripe tube. When the time resolution is constant, the reduction in the vertical range is equivalent to Due to the reduction of the imaging depth of each pixel; therefore, limited by the inherent imaging principle, the general non-scanning stripe tube laser imaging radar cannot solve the contradiction between high spatial resolution, long-distance detection, large field of view and large depth of field

Especially in terms of depth of field (for range images, imaging depth of field refers to the distance detection range of pixels, which can also be called range gate gating distance. Stripe tube lidar needs trigger signal delay equipment and range gating method In order to achieve long-distance detection), compared with other laser imaging radar systems, the striped tube laser imaging radar is at a disadvantage, and the non-scanning mechanism further reduces its imaging depth of field

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