CN110095021B

CN110095021B - Image space scanning device for large-view-field infrared optical system

Info

Publication number: CN110095021B
Application number: CN201910309834.3A
Authority: CN
Inventors: 李延伟; 马洪生; 刘莹莹; 梁陈
Original assignee: Harbin Xinguang Photoelectric Technology Co ltd
Current assignee: Harbin Xinguang Photoelectric Technology Co ltd
Priority date: 2019-04-17
Filing date: 2019-04-17
Publication date: 2020-11-17
Anticipated expiration: 2039-04-17
Also published as: CN110095021A

Abstract

The invention relates to an image space scanning method for a large-view-field infrared optical system, and belongs to the field of infrared imaging. The invention adopts an infrared optical system with a large visual field, utilizes a high-precision image space scanning mechanism based on a ball screw transmission principle to drive an infrared detector to perform two-dimensional motion, responds to system instructions in real time, can preset scanning angular speed, and has better motion position precision than 1', thereby realizing the imaging requirement of the infrared optical system in a large visual field range.

Description

Image space scanning device for large-view-field infrared optical system

Technical Field

The invention belongs to the field of infrared imaging, and particularly relates to an image space scanning method for a large-view-field infrared optical system.

Background

With the rapid development of science and technology and the promotion of world situation, infrared imaging guidance has become a hotspot of research in the field of precise guidance. In order to meet the requirement of a large field of view in a guidance system, one mode is to adopt a scanning type optical system, which comprises structural forms such as adding a scanning reflector and integrally rotating, but the scanning type optical system can cause rotating image motion, can increase the size and weight of a product, and is not beneficial to the development trend of miniaturization and light weight of the guidance system; the other method is to directly adopt an optical system with a large field of view, but at present, the size of the infrared detector cannot meet the imaging requirement of the large field of view.

Disclosure of Invention

The technical scheme adopted by the invention is as follows:

an image space scanning method for a large-view-field infrared optical system comprises an optical system (16), an infrared detector (18) and a high-precision image space scanning mechanism (19), wherein the optical system (16) images a received infrared scene on a focal plane (17), the two-dimensional translation of the infrared detector (18) is utilized to realize the scanning and searching function of the large view field, and the high-precision image space scanning mechanism (19) comprises an X-axis movement mechanism (1) and a Y-axis movement mechanism (2);

the X-axis movement mechanism (1) comprises an X-axis movement guide rail (3), an infrared detector mounting seat (4), an X-axis limiting block (5), an X-axis zero-position switch (6), an X-axis driving motor (7), an X-axis mounting seat (8) and an X-axis screw nut (9); an X-axis driving motor (7) is fixed on an X-axis mounting seat (8), a speed reducer is arranged at the front, an incremental encoder is arranged at the rear, a ball screw is utilized, an X-axis nut (9) converts rotary motion into linear motion, and the incremental encoder performs motion control;

the Y-axis movement mechanism (2) comprises a Y-axis movement guide rail (10), a Y-axis zero-position switch (11), a Y-axis driving motor (12), a Y-axis mounting seat (13), a Y-axis limiting block (14) and a Y-axis screw nut (15); a Y-axis moving guide rail (10) is arranged on the fixed rack, and a sliding block on the guide rail is connected with an X-axis mounting seat (8); the Y-axis driving motor (12) is fixed on the Y-axis mounting base (13), the front speed reducer is arranged, the rear incremental encoder is arranged, the rotating motion is converted into the linear motion by the Y-axis screw nut (15) through the ball screw, and the motion control is carried out by the incremental encoder.

Compared with the prior art, the invention has the beneficial effects that:

1. the imaging view field of the infrared optical system can be effectively expanded, and the large view field scanning search of the guidance system is realized;

2. the high-precision image space scanning mechanism based on the ball screw transmission principle can meet the requirements of scanning angular speed and motion position precision and can adapt to the requirements of low-temperature environment and vibration environment.

3. The image space scanning technology can give full play to the performance advantages of the small-size infrared detector, and effectively solves the problems of miniaturization and light weight of an infrared guidance system.

Drawings

FIG. 1 is a schematic diagram of an image space scanning method for a large field-of-view infrared optical system.

Fig. 2 is a schematic diagram of an image scanning technique.

Fig. 3 is a structural view of a high-precision image space scanning mechanism.

Fig. 4 is a front view of the X-axis movement mechanism.

Fig. 5 is a cross-sectional view of the X-axis motion mechanism.

Fig. 6 is a front view of the Y-axis movement mechanism.

Detailed Description

As shown in figure 1, the image space scanning method for the large-view-field infrared optical system comprises an optical system (16), an infrared detector (18) and a high-precision image space scanning mechanism (19), wherein the optical system (16) images a received infrared scene on a focal plane (17), the high-precision image space scanning mechanism is used for realizing two-dimensional translation of the infrared detector (18), the large-view-field scanning and searching function is realized, and the requirement of large-view-field rapid scanning and searching in an infrared guidance system is met.

As shown in fig. 2, which is a schematic diagram of an image scanning technology, the instantaneous field of view of the infrared optical system detector is 8 ° × 6 °, the designed scanning field of view is 32 ° × 24 °, and the field of view search range can be effectively expanded.

As shown in fig. 3, the high-precision image space scanning mechanism (19) includes an X-axis motion mechanism (1) and a Y-axis motion mechanism (2).

Fig. 4 is a front view of the X-axis movement mechanism, and fig. 5 is a sectional view of the X-axis movement mechanism. The X-axis movement mechanism (1) mainly comprises an X-axis movement guide rail (3), an infrared detector mounting seat (4), an X-axis limiting block (5), an X-axis zero-position switch (6), an X-axis driving motor (7), an X-axis mounting seat (8) and an X-axis screw nut (9). The X-axis moving guide rail (3) is used for mounting an infrared detector mounting seat (4); the X-axis limiting block (5) plays a role in motion limiting; the X-axis zero position switch (6) is used for zero position correction and determining an X-axis zero position; an X-axis driving motor (7) is fixed on an X-axis mounting seat (8), a front speed reducer and a rear incremental encoder convert the rotary motion into linear motion by an X-axis nut (9) by utilizing a ball screw, and the encoder performs motion control through subdivision.

As shown in fig. 6, which is a front view of the Y-axis movement mechanism, the Y-axis movement mechanism mainly comprises a Y-axis movement guide rail (10), a Y-axis zero switch (11), a Y-axis driving motor (12), a Y-axis mounting base (13), a Y-axis limiting block (14) and a Y-axis nut (15). A Y-axis moving guide rail (10) is arranged on the fixed rack, and a sliding block on the guide rail is connected with an X-axis mounting seat (8); the Y-axis zero position switch (11) is used for zero position correction and determining a Y-axis zero position; the Y-axis driving motor (12) is fixed on a Y-axis mounting seat (13), a front speed reducer and a rear incremental encoder convert the rotary motion into linear motion by a Y-axis nut (15) by utilizing a ball screw, and the encoder performs motion control through subdivision.

The X-axis driving motor and the Y-axis driving motor are high-speed direct current motors of Maxon company with model number RE16-118733, the speed reducer is of model number 424222, the lead screw driving assembly is of model number GP 16S phi 16, the maximum movement speed can reach 90.9mm/S, and the minimum use temperature can reach-20 ℃; the X-axis zero-position switch (6) and the Y-axis zero-position switch (11) are arranged at two ends of the movement of the X-axis and the Y-axis and used for zero-position correction; the X-axis moving guide rail (3) and the Y-axis moving guide rail (10) adopt precise THK guide rails for realizing high-precision movement; the X-axis mounting seat (8), the Y-axis mounting seat (13), the X-axis limiting block (5) and the Y-axis limiting block (14) are all made of aviation aluminum 2A12 materials with excellent mechanical properties. By utilizing the structure, the precision of each component is adjusted, the preset speed motion of the infrared detector can be realized, the motion precision is ensured to reach the use requirement (less than 1'), and finally the image space scanning technology is realized.

In conclusion, the infrared optical system with a large view field is adopted, the high-precision image space scanning mechanism based on the ball screw transmission principle is utilized to drive the infrared detector to perform two-dimensional motion, the imaging requirement of the large view field is met, large view field searching is realized, a stable and reliable image space scanning technology is provided, and the problems of miniaturization and light weight of the infrared guidance system can be solved.

Claims

1. An image space scanning device for a large-view-field infrared optical system comprises an optical system (16), an infrared detector (18) and a high-precision image space scanning mechanism (19), wherein the image surface size of the infrared detector (18) is smaller than the imaging image surface size of the optical system (16); the optical system (16) images the received infrared scene on a focal plane (17), the two-dimensional translation of the infrared detector (18) is utilized to realize the scanning and searching function of a large field of view, and the high-precision image scanning mechanism (19) comprises an X-axis motion mechanism (1) and a Y-axis motion mechanism (2);