技术领域technical field
本发明涉及光学成像领域的一种成像系统，尤其涉及一种主动式偏振目标增强的共光路全景环带光学成像装置。The invention relates to an imaging system in the field of optical imaging, in particular to an active polarization target enhanced common optical path panoramic ring optical imaging device.
背景技术Background technique
随着光学探测技术的发展，大视场光学成像系统由于其具有对大范围内物体进行探测的能力，已被广泛用于空间探测、军事侦察、安防监控、管道内窥等领域。许多应用场合对大视场光学探测系统的轻量化和高效能提出了要求，如车辆、飞行器需要对周围靠近的目标实现快速预警，交通监控中需要实现对大范围内车辆目标的高效检出等。With the development of optical detection technology, large field of view optical imaging system has been widely used in space detection, military reconnaissance, security monitoring, pipeline endoscopic and other fields due to its ability to detect objects in a wide range. Many applications put forward requirements for the lightweight and high performance of the large field of view optical detection system. For example, vehicles and aircraft need to realize fast early warning of nearby targets, and traffic monitoring needs to achieve efficient detection of vehicle targets in a wide range, etc. .
利用全景光学成像系统进行探测能在较大视场范围内发现目标。传统的单视场全景扫描成像技术是利用由单个成像镜头组成的系统旋转一周获得一系列图像，或沿360°各个方向放置一组单镜头进行同时分别拍摄后进行图像拼接完成，相机拍摄条件要求严格，图像处理耗时较长，实时性欠佳，同时其体积较大，结构复杂。基于平面圆柱投影原理的全景环带成像技术是一种与传统中心投影原理不同的成像技术，可在无需转动的条件下，将周围物体一次性地成像在单个图像传感器上，从光学原理上实现了360°全景凝视成像。全景环带光学成像系统是一种折反式的大视场成像系统，体积小，重量轻，制作工艺与普通全折射光学系统类似，设计方式灵活，可以有效地对四周的大视场范围内的物体成像，实现目标探测。The use of panoramic optical imaging system for detection can find targets in a large field of view. The traditional monoscopic panoramic scanning imaging technology uses a system composed of a single imaging lens to rotate a circle to obtain a series of images, or place a group of single lenses along 360° in all directions for simultaneous shooting and image stitching. The camera shooting conditions require Strict, the image processing takes a long time, the real-time performance is not good, and its volume is large and the structure is complex. The panoramic annular imaging technology based on the principle of planar cylindrical projection is an imaging technology different from the traditional central projection principle. It can image the surrounding objects on a single image sensor at one time without rotation, and realize it from the optical principle. 360° panoramic staring imaging. The panoramic annular optical imaging system is a catadioptric large field of view imaging system with small size and light weight. The manufacturing process is similar to that of ordinary total refraction optical systems. Object imaging to achieve target detection.
一般成像系统获得的图像容易受到外界环境因素的影响，对于隐藏在自然背景中的人造目标，图像中目标与背景的对比度低使得目标不易被发现，这对于大视场范围内的目标探测十分不利。为此，人们提出拓展成像过程中获得的信息维度来实现目标增强，提高目标的检出率，如光谱信息、深度信息、偏振信息等。其中，基于偏振信息的目标增强成像方式可以区分目标与背景的偏振特征差异，在获取强度和偏振信息的同时，有效增强图像细节，提高复杂背景下的探测效率。尤其对于人造物体如车辆、飞行器而言，这些目标表面较为光滑，在被偏振光照明时，其反射光可以较为有效地保持偏振度，而自然背景由于散射较为严重，入射偏振光经过散射后，其反射光往往具有较低的偏振度。因此，可以利用物体对入射偏振光的响应能力差异来实现目标物体的有效增强。然而，现有的偏振目标增强光学成像系统视场角较为有限，无法对大视场范围内的目标实现有效、快速的光学探测和增强。另外，成像过程和偏振信息获取往往在被动照明条件下完成，无法适应弱光照环境，也使获得的偏振信息噪声较大。The images obtained by general imaging systems are easily affected by external environmental factors. For artificial targets hidden in the natural background, the low contrast between the target and the background in the image makes the target difficult to be found, which is very unfavorable for target detection in a large field of view. . For this reason, it is proposed to expand the information dimension obtained in the imaging process to achieve target enhancement and improve the detection rate of the target, such as spectral information, depth information, polarization information, etc. Among them, the target enhancement imaging method based on polarization information can distinguish the difference in polarization characteristics between the target and the background, and effectively enhance the image details while obtaining the intensity and polarization information, and improve the detection efficiency in complex backgrounds. Especially for man-made objects such as vehicles and aircraft, the surface of these targets is relatively smooth. When illuminated by polarized light, the reflected light can effectively maintain the degree of polarization. However, due to the serious scattering of the natural background, after the incident polarized light is scattered, Its reflected light tends to have a lower degree of polarization. Therefore, the difference in responsiveness of objects to incident polarized light can be exploited to achieve effective enhancement of target objects. However, the existing polarization target enhancement optical imaging system has a limited field of view and cannot achieve effective and rapid optical detection and enhancement of targets within a large field of view. In addition, the imaging process and acquisition of polarization information are often completed under passive lighting conditions, which cannot adapt to low-light environments and make the obtained polarization information noisy.
发明内容Contents of the invention
本发明的目的在于针对现有技术的不足，提供一种主动式偏振目标增强的共光路全景环带光学成像装置，实现大视场范围内的实时偏振目标增强成像。该装置以全景环带系统作为照明和成像的基本形式，有效视场大，体量轻巧。同时，利用偏振元件组合成的偏振分光组件提供成像物体的偏振信息，并实现紧凑高效的共光路设计。该装置采取主动式偏振光照明，可有效增强偏振信息的强度，提高装置对弱光照环境的适应性。The object of the present invention is to address the deficiencies in the prior art, to provide an active polarization target enhanced common optical path panoramic annular optical imaging device, to realize real-time polarization target enhanced imaging within a large field of view. The device uses a panoramic ring system as the basic form of illumination and imaging, with a large effective field of view and a light weight. At the same time, the polarization beam splitting component composed of polarizing elements provides the polarization information of the imaging object, and realizes a compact and efficient common optical path design. The device adopts active polarized light illumination, which can effectively enhance the intensity of polarization information and improve the adaptability of the device to weak light environments.
本发明的目的是通过以下技术方案来实现的：一种主动式偏振目标增强的共光路全景环带光学成像装置，包括全景环带偏振照明系统与全景环带偏振成像系统；采用大视场全景环带光学系统作为照明与成像的基本形式；照明系统与成像系统共光路，照明光源与成像相机分置于分光组件两侧；以偏振器件组合作为照明光与成像光的分光组件。The purpose of the present invention is achieved through the following technical solutions: a common optical path panoramic annular optical imaging device with active polarization target enhancement, including a panoramic annular polarization lighting system and a panoramic annular polarization imaging system; a large field of view panoramic The annular optical system is the basic form of illumination and imaging; the illumination system and the imaging system have a common optical path, and the illumination source and imaging camera are separated on both sides of the beam splitting component; the combination of polarizing devices is used as the beam splitting component of the illumination light and imaging light.
进一步地，所述的全景环带光学系统的基本形式，由全景环带透镜、后续镜组、偏振分光组件及靶面依次排布组成；对于照明系统光路而言，靶面为光源面；对于成像系统光路而言，靶面为成像相机。Further, the basic form of the panoramic annular optical system is composed of a panoramic annular lens, a follow-up mirror group, a polarization splitting component, and a target surface arranged in sequence; for the light path of the lighting system, the target surface is the light source surface; for In terms of the optical path of the imaging system, the target surface is the imaging camera.
进一步地，所述的偏振分光组件由偏振转换器、偏振分束器和λ/4波片组成；对于照明系统，所述的偏振分光组件将光源发出的自然光变成振动方向与入射面平行的线偏振光，经λ/4波片后成为圆偏振的照明光；对于成像系统，所述的偏振分光组件的λ/4波片将物体反射回的圆偏振光分量变为振动方向与入射面垂直的线偏振光，经偏振分束器反射后到达像面，物体由于退偏产生的非偏振光分量则无法完全到达像面；所述的偏振分光组件可以将具有高保偏性的目标物体的反射光能量较为完整地转移到像面，而仅将低保偏性的背景物体的部分反射光能量转移到像面，从而根据偏振信息实现目标的增强成像。Further, the polarization splitting component is composed of a polarization converter, a polarization beam splitter and a λ/4 wave plate; for the lighting system, the polarization splitting component converts the natural light emitted by the light source into a vibration direction parallel to the incident surface Linearly polarized light becomes circularly polarized illumination light after passing through the λ/4 wave plate; for the imaging system, the λ/4 wave plate of the polarization beam splitting component changes the circularly polarized light component reflected back by the object into the vibration direction and the incident surface The vertical linearly polarized light reaches the image plane after being reflected by the polarization beam splitter, and the non-polarized light component generated by the depolarization of the object cannot completely reach the image plane; the polarization splitting component can convert the target object with high polarization The reflected light energy is relatively completely transferred to the image plane, and only part of the reflected light energy of the low polarization maintaining background object is transferred to the image plane, so that the enhanced imaging of the target can be realized according to the polarization information.
进一步地，所述全景环带透镜的前表面包括前透射面和位于前透射面中心的前反射面；后表面包括后反射面和位于后反射面中心的后透射面。Further, the front surface of the panoramic annular lens includes a front transmission surface and a front reflection surface located at the center of the front transmission surface; the rear surface includes a rear reflection surface and a rear transmission surface located at the center of the rear reflection surface.
进一步地，所述全景环带透镜采用双胶合结构。Further, the panoramic annular lens adopts a double cemented structure.
本发明有益效果是：The beneficial effects of the present invention are:
1.本发明实现了大视场范围高对比度的关键目标探测。利用目标物体和背景物体保偏性能的差异，可增强关键目标物体与背景环境的对比度，有利于目标探测与追踪。结合超广角全景环带光学系统，可以在单相机的条件下实现大视场范围内的目标探测。1. The present invention realizes key target detection with large field of view and high contrast. Using the difference in polarization maintaining performance between the target object and the background object, the contrast between the key target object and the background environment can be enhanced, which is beneficial to target detection and tracking. Combined with the ultra-wide-angle panoramic ring optical system, it can achieve target detection in a large field of view under the condition of a single camera.
2.本发明集成了照明系统与成像系统，采用主动成像方式，可在弱光环境中探测目标，如管道内部、狭窄空间、水下环境等。同时，相对于被动成像方式，本发明采用的主动成像方式可以提供更真实有效的物体保偏性能信息，信噪比更高。2. The present invention integrates the lighting system and the imaging system, adopts the active imaging method, and can detect targets in low-light environments, such as inside pipelines, narrow spaces, and underwater environments. At the same time, compared with the passive imaging method, the active imaging method adopted in the present invention can provide more real and effective information on the polarization maintaining performance of the object, and has a higher signal-to-noise ratio.
3.本发明采用共光路设计，提高了系统对振动等环境因素的稳健性，系统装置结构紧凑，体量轻巧，可适用于较为恶劣的工作环境。3. The present invention adopts a common optical path design, which improves the robustness of the system against environmental factors such as vibration. The system device has a compact structure and a light weight, and is applicable to relatively harsh working environments.
附图说明Description of drawings
图1是本发明装置结构示意图。Fig. 1 is a schematic diagram of the structure of the device of the present invention.
图2是本发明装置的光路图及偏振态改变示意图。Fig. 2 is an optical path diagram and a schematic diagram of polarization state change of the device of the present invention.
图3是本发明优化后的系统结构图。Fig. 3 is an optimized system structure diagram of the present invention.
图4是本发明优化后的MTF图。Fig. 4 is the optimized MTF diagram of the present invention.
图5是本发明优化后的场曲曲线图。Fig. 5 is a field curvature curve diagram after optimization in the present invention.
图6是本发明优化后的畸变曲线图。Fig. 6 is a distortion curve diagram after optimization of the present invention.
图中：全景环带透镜1、后续镜组2、偏振分光组件3、照明光源4、成像相机5、前透射面6、后反射面7、前反射面8、后透射面9、λ/4波片10、偏振分束器11、偏振转换器12。In the figure: panoramic annular lens 1, follow-up lens group 2, polarization beam splitting component 3, illumination source 4, imaging camera 5, front transmission surface 6, rear reflection surface 7, front reflection surface 8, rear transmission surface 9, λ/4 A wave plate 10, a polarization beam splitter 11, and a polarization converter 12.
具体实施方式detailed description
下面结合附图及具体实施例对本发明作进一步详细说明。The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
如图1所示，本发明提供的一种主动式偏振目标增强的共光路全景环带光学成像装置，包括全景环带偏振照明系统与全景环带偏振成像系统；照明系统包括同轴安装的全景环带透镜1、置于全景环带透镜1后方的后继镜组2、偏振分光组件3和照明光源4；成像系统包括与照明系统共用的全景环带透镜1、置于全景环带透镜1后方的后继透镜组2、偏振分光组件3及与照明系统光轴垂直的成像相机5。As shown in Figure 1, an active polarization target enhanced common optical path panoramic annular optical imaging device provided by the present invention includes a panoramic annular polarization illumination system and a panoramic annular polarization imaging system; the illumination system includes a coaxially installed panoramic An annular lens 1, a follower mirror group 2 placed behind the panoramic annular lens 1, a polarization splitting assembly 3 and an illumination light source 4; the imaging system includes a panoramic annular lens 1 shared with the lighting system, placed behind the panoramic annular lens 1 The follow-up lens group 2, the polarization splitting component 3 and the imaging camera 5 perpendicular to the optical axis of the illumination system.
如图2所示，照明光源4发出的为自然光，经偏振转换器12后成为p光，p光经过偏振分束器11时，会沿水平光轴方向直接透过；通过偏振分束器11的p光通过λ/4波片10后相位改变π/2成为右旋圆偏振光，该右旋圆偏振光通过后继镜组2后再经全景环带透镜1投射至物空间，实现大视场照明。物空间的物体分为背景物体与目标物体两种，一般认为，背景物体的保偏性能较低，目标物体保偏性能较高。当右旋圆偏振光经目标物体表面反射后，可以良好地保持偏振态，反射回的光为左旋圆偏振光，可通过全景环带光学系统进入偏振分光组件3。反射的圆偏振光逆向通过λ/4波片10后相位再次改变π/2，偏振方向相比于初始偏振方向旋转90°，成为s光，s光经过偏振分束器11时，会沿竖直方向反射进入成像相机5成像；背景物体的反射光偏振度较低，经过λ/4波片10之后s分量较弱，经过偏振分束器11反射到达像面的光能较少。因此，从图像的角度而言，目标物体相比于背景物体具有更高的亮度，图像对比度更好，易于区分。As shown in Figure 2, what the illuminating light source 4 emits is natural light, becomes p light after the polarization converter 12, and when the p light passes through the polarization beam splitter 11, it can directly pass through along the horizontal optical axis direction; through the polarization beam splitter 11 The p light passes through the λ/4 wave plate 10 and changes its phase by π/2 to become right-handed circularly polarized light. The right-handed circularly polarized light passes through the follow-up mirror group 2 and then is projected into the object space through the panoramic annular lens 1 to achieve a large viewing angle. field lighting. Objects in the object space are divided into background objects and target objects. It is generally believed that the polarization maintaining performance of background objects is low, and the polarization maintaining performance of target objects is high. When the right-handed circularly polarized light is reflected by the surface of the target object, the polarization state can be well maintained, and the reflected light is left-handed circularly polarized light, which can enter the polarization beam splitting component 3 through the panoramic ring optical system. The reflected circularly polarized light reversely passes through the λ/4 wave plate 10, and the phase changes again by π/2, the polarization direction is rotated by 90° compared to the initial polarization direction, and becomes s light. When the s light passes through the polarization beam splitter 11, it will travel The reflection in the straight direction enters the imaging camera 5 for imaging; the reflected light of the background object has a low degree of polarization, the s component is weak after passing through the λ/4 wave plate 10, and the light energy reflected by the polarization beam splitter 11 and reaches the image plane is less. Therefore, from the perspective of the image, the target object has higher brightness than the background object, the image contrast is better, and it is easy to distinguish.
在本发明中，所涉及的光学元件表面需要镀增透膜，以提高光能利用率，避免形成鬼像和眩光。In the present invention, the surface of the involved optical element needs to be coated with an anti-reflection film, so as to improve the utilization rate of light energy and avoid forming ghost images and glare.
在本发明中，λ/4波片10的晶轴与偏振转换器12透振方向成45°角，使p光两次通过λ/4波片10后振动方向旋转90°，成为s光。In the present invention, the crystal axis of the λ/4 wave plate 10 is at an angle of 45° to the transmission direction of the polarization converter 12, so that the p-light passes through the λ/4 wave plate 10 twice, and the vibration direction is rotated by 90° to become s-light.
在本发明中，全景环带光学系统的成像方式是：同一物点发出的光线从后反射面7折射进入实体，然后被后反射面7与前反射面8两次反射，最后从后透射面9折射出实体。光线通过全景环带透镜1后在其内部或后方形成虚像，该虚像通过后继镜组2折射，成像于成像相机5。In the present invention, the imaging mode of the panoramic annular optical system is: the light emitted by the same object point is refracted from the rear reflective surface 7 into the entity, then reflected twice by the rear reflective surface 7 and the front reflective surface 8, and finally from the rear reflective surface 9 refracts entities. After the light passes through the panoramic annular lens 1 , a virtual image is formed inside or behind it, and the virtual image is refracted by the subsequent mirror group 2 and imaged on the imaging camera 5 .
在本发明中，上述全景环带光学系统的全景环带透镜1采用双胶合结构，这既增加了系统消色差的能力，同时也减少了后继透镜组的像差校正压力。In the present invention, the panoramic annular lens 1 of the above-mentioned panoramic annular optical system adopts a double cemented structure, which not only increases the achromatic ability of the system, but also reduces the aberration correction pressure of the subsequent lens group.
在本发明中，成像系统使用大画幅的面阵CMOS相机或CCD相机，可得到大视场较高分辨率的环形像面。In the present invention, the imaging system uses a large-format area array CMOS camera or a CCD camera, which can obtain an annular image plane with a large field of view and high resolution.
对所述的照明系统而言，光源可根据照明需求选用对应光谱特性和发光强度的光源。为了防止光源的不均匀性影响照明的照度分布，应当在光源之后使用复眼透镜等匀光元件，采用柯拉照明形式。偏振转换器由偏振分束器(PBS)阵列组成，各PBS单元通过合理镀膜，可透射偏振态与入射面平行的光波分量(p光)，并通过在各PBS单元间发生的多次反射将偏振态与入射面垂直的光波分量(s光)转换成p光。由此，光源发出的光经由偏振转换器，能够以最大的光能利用率转换成为p光，作为有效的照明光。For the above-mentioned lighting system, the light source can be selected according to lighting requirements with corresponding spectral characteristics and luminous intensity. In order to prevent the inhomogeneity of the light source from affecting the illuminance distribution of the lighting, a uniform light element such as a fly-eye lens should be used after the light source, and the form of Kolar lighting should be adopted. The polarization converter is composed of a polarization beam splitter (PBS) array. Each PBS unit can transmit the light wave component (p light) whose polarization state is parallel to the incident plane through reasonable coating, and through multiple reflections between each PBS unit. The light wave component (s-light) whose polarization state is perpendicular to the plane of incidence is converted into p-light. In this way, the light emitted by the light source can be converted into p-light with the maximum utilization rate of light energy through the polarization converter as effective illumination light.
对所述的照明系统而言，经由偏振分光组件产生的圆偏振照明光通过全景环带光学系统输出到物空间，照明的物空间范围与全景环带光学系统的视场角一致。全景环带光学系统包含全景环带透镜和后继镜组。其中，全景环带透镜由前透射面，后反射面，前反射面和后透射面组成，能将光轴360°范围的圆柱视场投影到一个二维环形区域中。全景环带透镜采用双胶合结构，增加系统消色差的能力，同时也减少后继透镜组的像差校正压力。后继镜组为一片或多片凸透镜或凹透镜，用于成像和校正各类像差。For the above illumination system, the circularly polarized illumination light generated by the polarization beam splitting component is output to the object space through the panoramic annular optical system, and the scope of the illuminated object space is consistent with the field angle of the panoramic annular optical system. The panoramic ring optical system includes a panoramic ring lens and a subsequent lens group. Among them, the panoramic annular lens is composed of a front transmission surface, a rear reflection surface, a front reflection surface and a rear transmission surface, and can project a cylindrical field of view within 360° of the optical axis into a two-dimensional annular area. The panoramic ring lens adopts a double cemented structure, which increases the achromatic ability of the system and reduces the aberration correction pressure of the subsequent lens group. The subsequent lens group is one or more convex lenses or concave lenses, which are used for imaging and correcting various aberrations.
对所述的成像系统而言，被照明系统照明的物体反射回来的光作为成像光通过上述全景环带光学系统进入偏振分光组件。成像光经过λ/4波片后，相位再次改变π/2，此时光的相位相对于照明光进入λ/4波片之前的相位改变了π。理想情况下，考虑物体反射光严格保持入射照明光偏振态，经过λ/4波片的成像光相位相对于照明光进入λ/4波片之前的相位改变了π。由于进入λ/4波片前的照明光为p偏振，则经过了所述的π相位变化后，成像光为s偏振，被偏振分束器反射，成像在相机图像传感器上。实际情况中，由于散射产生的退偏等因素，物体无法完全保持入射光的偏振态。物体由于退偏产生的非偏振光同时包含p分量和s分量，在经过偏振分束器的时候只有s分量能到达像面。因此，当物体退偏程度较高时，成像光的能量衰减得较多。因此，所述的偏振分光组件可以将具有高保偏性的目标物体的反射光能量较为完整地转移到像面，而仅将部分低保偏性的背景物体的反射光能量转移到像面，进而实现高保偏性目标物体相对于低保偏性背景物体的对比度增强成像。For the above-mentioned imaging system, the light reflected by the object illuminated by the illumination system enters the polarization beam splitting assembly through the above-mentioned panoramic annular optical system as imaging light. After the imaging light passes through the λ/4 wave plate, the phase changes again by π/2. At this time, the phase of the light changes by π relative to the phase of the illuminating light before entering the λ/4 wave plate. Ideally, considering that the reflected light of the object strictly maintains the polarization state of the incident illumination light, the phase of the imaging light passing through the λ/4 wave plate changes by π relative to the phase of the illumination light before entering the λ/4 wave plate. Since the illumination light before entering the λ/4 wave plate is p-polarized, after the π phase change, the imaging light is s-polarized, reflected by the polarization beam splitter, and imaged on the camera image sensor. In reality, due to factors such as depolarization caused by scattering, the object cannot fully maintain the polarization state of the incident light. The unpolarized light produced by the object due to depolarization contains both the p component and the s component, and only the s component can reach the image plane when passing through the polarizing beam splitter. Therefore, when the depolarization degree of the object is higher, the energy of the imaging light is attenuated more. Therefore, the described polarization beam splitting component can relatively completely transfer the reflected light energy of the target object with high polarization maintaining property to the image plane, and only transfer the reflected light energy of part of the background objects with low polarization maintaining property to the image plane, and then Contrast-enhanced imaging of high polarization-maintaining target objects relative to low polarization-maintaining background objects is achieved.
本发明的实施例及过程如下：Embodiments of the present invention and process are as follows:
根据本发明装置的结构构建光路，其中全景环带透镜和后继镜组的各表面均采用球面，减少加工难度。According to the structure of the device of the present invention, the optical path is constructed, wherein the surfaces of the panoramic annular lens and the subsequent lens group are all spherical, which reduces the difficulty of processing.
全景环带透镜1采用折射率较高的火石材料作为第一片镜片来减小口径。后继镜组2采用多个镜片的组合及双胶合透镜来校正像差并成像。The panoramic annular lens 1 adopts a flint material with a higher refractive index as the first lens to reduce the aperture. The subsequent lens group 2 uses a combination of multiple lenses and a doublet lens to correct aberrations and form images.
现设计一套有效视场为30°～89°，光圈数F＝3的共光路全景环带光学成像装置，工作波段为可见光区，参考波长为C,d,F光。在利用光学设计软件进行优化设计时，通过多重结构完成照明系统、成像系统的优化设计。优化后的系统具体结构及光路图如图3，从不同视场进入的平行光线分别在像面上成点像。Now design a set of common light path panoramic annular optical imaging device with effective field of view of 30°～89° and aperture number F=3. The working band is visible light region, and the reference wavelengths are C, d, F light. When using optical design software for optimal design, the optimal design of the lighting system and imaging system is completed through multiple structures. The specific structure and optical path diagram of the optimized system are shown in Figure 3. Parallel rays entering from different fields of view form point images on the image plane.
考虑上述设计的成像系统，采用像元大小为5um的CCD相机，故Nyquist频率为＝100lp/mm，由图4可见，该系统的调制传递函数MTF在Nyquist频率处接近0.5。Considering the imaging system designed above, a CCD camera with a pixel size of 5um is used, so the Nyquist frequency is =100lp/mm. It can be seen from Figure 4 that the modulation transfer function MTF of the system is close to 0.5 at the Nyquist frequency.
考虑上述设计的成像系统，由图6可见，在视场范围内，按f-θ成像模式考虑，畸变小于1％。Considering the above-designed imaging system, it can be seen from Fig. 6 that within the field of view, the distortion is less than 1% in the f-θ imaging mode.
上述具体实施方式用来解释说明本发明，而不是对本发明进行限制，在本发明的精神和权利要求的保护范围内，对本发明作出的任何修改和改变，都落入本发明的保护范围。The above specific embodiments are used to explain the present invention, rather than to limit the present invention. Within the spirit of the present invention and the protection scope of the claims, any modification and change made to the present invention will fall into the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
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| CN201710028565.4ACN106773034A (en) | 2017-01-16 | 2017-01-16 | The common light path overall view ring belt optical imaging device of active polarization targets improvement |
| Application Number | Priority Date | Filing Date | Title |
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| CN201710028565.4ACN106773034A (en) | 2017-01-16 | 2017-01-16 | The common light path overall view ring belt optical imaging device of active polarization targets improvement |
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| CN106773034Atrue CN106773034A (en) | 2017-05-31 |
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| CN201710028565.4APendingCN106773034A (en) | 2017-01-16 | 2017-01-16 | The common light path overall view ring belt optical imaging device of active polarization targets improvement |
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