阅读说明：本技术 一种紧凑型红外可见共光路变焦光学系统及目标探测方法 (Compact infrared visible common-light-path zooming optical system and target detection method ) 是由 刘相伟 李卓荦 于 2019-09-18 设计创作，主要内容包括：本发明提供本发明提出了一种紧凑型红外可见共光路变焦光学系统,它包括：可见光透镜组、折转反射镜一、折转反射镜二和红外透镜组,所述红外透镜组包括依次排列的红外调焦组、红外变焦镜组和红外补偿镜组,所述红外调焦组中心开设有通孔,所述可见光透镜组贯穿于通孔中,所述折转反射镜一位于可见光透镜组与红外变焦镜组之间,所述折转反射镜二位于折转反射镜一的一侧,且折转反射镜二和折转反射镜一平行设置,包括红外后固定组,所述红外后固定组设置在红外补偿镜组的一侧。通过实施本发明使得光路更加紧凑和简洁,焦距可变,成本更加低廉,而且降低变焦过程带来的畸变,可满足小型光电吊舱等平台对轻小型复合共光轴光学系统的要求。(The invention provides a compact infrared visible common-path zooming optical system, which comprises: visible light battery of lens, a catadioptric speculum one, a catadioptric speculum two and infrared battery of lens, infrared battery of lens is including the infrared focusing group, the infrared zoom group and the infrared compensation group of lens that arrange in proper order, the through-hole has been seted up at infrared focusing group center, the visible light battery of lens runs through in the through-hole, catadioptric speculum one is located between visible light battery of lens and the infrared zoom group of lens, the catadioptric speculum is two in one side of a catadioptric speculum one, and a catadioptric speculum two and a parallel arrangement of catadioptric speculum, including infrared after-fixing group, infrared after-fixing group sets up the one side at the infrared compensation group of lens. By implementing the invention, the optical path is more compact and concise, the focal length is variable, the cost is lower, the distortion caused by the zooming process is reduced, and the requirements of platforms such as a small photoelectric pod and the like on a light and small composite common optical axis optical system can be met.)

1. A compact infrared-visible common-path zoom optical system, comprising: visible light battery of lens (1), a catadioptric speculum (2), two (3) of catadioptric speculum and infrared battery of lens (4), infrared battery of lens (4) is including the infrared focusing group (41), the infrared zoom group of lens (42) and the infrared compensation group of lens (43) that arrange in proper order, through-hole (411) have been seted up at infrared focusing group (41) center, visible light battery of lens (1) runs through in through-hole (411), catadioptric speculum (2) is located between visible light battery of lens (1) and the infrared zoom group of lens (42), two (3) of catadioptric speculum are located one side of catadioptric speculum (2), and two (3) of catadioptric speculum and a (2) parallel arrangement of catadioptric speculum.

2. A compact infrared-visible common path zoom optical system according to claim 1, further comprising: the infrared rear fixing group (44) is arranged on one side of the infrared compensation mirror group (43).

3. A compact infrared-visible common path zoom optical system according to claim 1, further comprising: the cam mechanism (5) comprises a first cam (51), a second cam (52) and a lens barrel (53), and the first cam (51) and the second cam (52) are arranged in the lens barrel (53).

4. A compact infrared-visible common-path zoom optical system according to claim 3, characterized in that the first cam (51) is fixedly connected with the infrared focusing group (41), and the second cam (52) is fixedly connected with the infrared compensating lens group (43).

5. the compact infrared-visible common-path zooming optical system of claim 1, wherein the first turning mirror (2) and the second turning mirror (3) are respectively arranged at an angle of 45 ° with respect to the optical axis.

6. An object detection method using a compact infrared-visible common-path zoom optical system according to any one of claims 1 to 5, comprising the steps of:

The method comprises the following steps that firstly, visible light and infrared light beams are incident to an inlet of an optical system on a common optical axis;

Step two, when the incident parallel light beams of the visible light pass through the visible light lens group (1), the incident parallel light beams become convergent light beams, and the convergent light beams are refracted and rotated through a first refracting reflector (2) and then refracted and rotated through a second refracting reflector (3), are vertical to the incident optical axis and form images on a visible phase plane;

Imaging on an infrared image surface after infrared incident parallel light beams pass through an infrared optical system consisting of an infrared focusing group (41), a first catadioptric mirror (2), an infrared zoom lens group (42), an infrared compensation lens group (43) and an infrared rear fixing group (44);

And fourthly, the cam I (51) and the cam II (52) axially move along the inner part of the lens cone (53) and drive the infrared zoom lens group (41) and the infrared compensation lens group (43) to move so as to detect the target.

7. The method as claimed in claim 6, wherein the operating band of the infrared optical system is 8um to 14 um.

8. The method as claimed in claim 6, wherein the visible light is a fixed focal length and the infrared is a variable focal length.

9. The method for detecting the target of the compact infrared-visible common-path zooming optical system according to claim 6, wherein the infrared zoom lens group (42), the infrared compensation lens group (43) and the infrared rear fixing group (44) are sequentially arranged in a tapered manner along the optical axis direction.

10. The method for detecting the target of the compact infrared-visible common-path zooming optical system according to claim 6, wherein the infrared zoom lens group (42), the infrared compensation lens group (43) and the infrared rear fixed group (44) are arranged coaxially.

Technical Field

The invention relates to an infrared-visible common-path zooming optical system, in particular to a compact infrared-visible common-path zooming optical system and a target detection method.

Background

In a photoelectric detection system, multi-band detection is adopted to provide more-dimensional information of a target, and infrared and visible band compounding is a common multi-band compounding detection technology. In order to obtain a high-precision target position, high-precision image fusion and other technologies are realized; meanwhile, in order to adapt the compound optical system to a spherical head cap, the incident optical axes of the infrared and visible optical systems must be consistent, and common-axis imaging is realized.

The traditional common-path optical system adopts a spectroscope to realize wave band light splitting, the cost of the spectroscope is high, and the light splitting efficiency is generally not higher than 90%. The visible light and infrared optical systems are arranged side by side, the optical systems are large in size, the appearance is not circularly symmetrical, and space utilization is not facilitated. On platforms such as small photoelectric pods, due to space limitation, visible light and infrared light paths are generally arranged side by side, and the target detection precision is reduced.

at present, a common optical path optical system has been developed to a certain extent, a chinese patent publication No. CN109975961A, "a visible light and long wave infrared common caliber composite imaging optical system", discloses a visible light and long wave infrared common optical path optical system, a chinese patent publication No. CN109211413A, "an infrared visible light common aperture imaging optical system", discloses an infrared visible light common aperture imaging optical system including a primary and secondary reflector, a chinese patent publication No. CN102495473A, "a visible light and infrared light splitting system", discloses a visible light and infrared light path separating system, the common characteristics of these optical systems are fixed focal length, lack of zoom function, zoom optical design usually causes distortion effect on infrared imaging, especially after infrared and visible common optical path design, the distortion is more obvious due to complexity of optical path increase, the zoom-in or zoom-out lens cannot be drawn in or out at will according to the requirements, and with the application development of photoelectric detection, the requirement on zooming is increasingly strong, and a zoom common optical path optical system is urgently needed.

Disclosure of Invention

The invention aims to provide a compact infrared and visible common-path zooming optical system, which solves the problems that the traditional common-path optical system has larger volume, fixed focal length and higher cost, has distortion phenomenon in zooming and can not meet the requirement of a small optical level platform on the space volume.

In order to solve the problems of the prior art, the invention provides a compact infrared-visible common-path zoom optical system, which comprises: visible light battery of lens, a catadioptric speculum one, a catadioptric speculum two and infrared battery of lens, infrared battery of lens is including the infrared focusing group, the infrared zoom group and the infrared compensation group of lens that arrange in proper order, the through-hole has been seted up at infrared focusing group center, the visible light battery of lens runs through in the through-hole, catadioptric speculum one is located between visible light battery of lens and the infrared zoom group, the catadioptric speculum is two in one side of a catadioptric speculum one, and a second and a parallel arrangement of catadioptric speculum.

Further, it also includes: the infrared rear fixing group is arranged on one side of the infrared compensation lens group.

Further, it also includes: the cam mechanism comprises a first cam, a second cam and a lens barrel, and the first cam and the second cam are arranged in the lens barrel.

Furthermore, the first cam is fixedly connected with the infrared focusing group, and the second cam is fixedly connected with the infrared compensation lens group.

furthermore, the first turning reflector and the second turning reflector are respectively arranged at an included angle of 45 degrees with the optical axis.

Furthermore, the invention also discloses a target detection method by using the compact infrared visible common-path zooming optical system, which comprises the following steps:

The method comprises the following steps that firstly, visible light and infrared light beams are incident to an inlet of an optical system on a common optical axis;

Step two, when the incident parallel light beams of the visible light pass through the visible light lens group, the incident parallel light beams become convergent light beams, and the convergent light beams are refracted and rotated by the first refracting reflector and the second refracting reflector, are perpendicular to the incident optical axis and form images on a visible phase plane;

imaging on an infrared image surface after infrared incident parallel light beams pass through an infrared optical system consisting of an infrared focusing group, a first catadioptric mirror, an infrared zooming lens group, an infrared compensation lens group and an infrared rear fixing group;

And fourthly, the first cam and the second cam axially move along the inner part of the lens cone and drive the infrared zoom lens group and the infrared compensation lens group to move so as to detect the target.

Furthermore, the working wave band of the infrared optical system is 8 um-14 um.

Further, the visible light is a fixed focal length, and the infrared light is a variable focal length.

Furthermore, the infrared zoom lens group, the infrared compensation lens group and the infrared rear fixing group are sequentially arranged in a reducing manner along the optical axis direction.

furthermore, the infrared zoom lens group, the infrared compensation lens group and the infrared rear fixing group are arranged in a coaxial manner.

The invention has the beneficial effects that:

1. by changing the arrangement mode of the visible light lens group and the infrared lens group, the size of an optical system is reduced, space utilization is facilitated, and the target detection precision is improved;

2. The infrared rear fixing group is combined with the infrared compensation lens group to realize continuous zooming, so that an image at each position in the zooming process is very clear;

3. through continuous optimization of light path design and adjustment of a cam mechanism, distortion is reduced to a small range to a greater extent, and therefore the common-light-path zooming invention design is achieved;

4. The invention has the advantages of compact and simple light path, variable focal length and low cost, and can meet the requirements of platforms such as small photoelectric pod and the like on light and small composite common optical axis optical systems.

Drawings

FIG. 1 is a schematic structural diagram of a compact infrared-visible common-path zoom optical system according to the present invention;

FIG. 2 is a schematic structural diagram of a cam mechanism in the compact infrared-visible common-path zoom optical system according to the present invention.

Legend: 1. a visible light lens group; 2. a first turning reflector; 3. a second turning reflector; 4. an infrared lens group; 41. an infrared focusing group; 42. an infrared zoom lens group; 43. an infrared compensation lens group; 44. infrared rear fixing group; 5. a cam mechanism; 51. a first cam; 52. a second cam; 53. a lens barrel; 54. an electric motor.

Detailed Description

The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

the embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present disclosure, and the drawings only show the components related to the present disclosure rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.

In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.