A Miniaturized Negative Compensation Mid-Wave Cooled Infrared Continuous Zoom Optical System

Abstract

A miniaturized negative compensation medium-wave cooling infrared continuous zoom optical system, which adopts negative group mechanical compensation, secondary imaging, continuous zoom, and three-mirror design, which reduces the length of the optical system and has a larger minimum focal length of the system; Through the optical and lens design, on the premise of satisfying the system imaging quality, a combination of only 9 lenses is obtained, which has a high transmittance and improves the system sensitivity; the field of view diaphragm structure is increased to reduce the impact of stray light on the system. The influence of imaging improves the signal-to-noise ratio of the system; the cold diaphragm is adopted, and the efficiency is 100%, which reduces the energy loss of the beam, suppresses the system noise, and improves the system sensitivity and signal-to-noise ratio; changes the system three times through three plane mirrors The direction of the optical axis effectively shortens the total length of the optical system, which meets the needs of airborne photoelectric pod systems that have strict requirements on the volume, weight, and imaging quality of the optical system, and is at the leading level of similar domestic products.

Description

technical field [0001] The invention relates to the technical field of an airborne photoelectric pod infrared thermal imager, in particular to a miniaturized negative compensation medium-wave cooling infrared continuous zoom optical system. Background technique [0002] The airborne photoelectric pod system requires that the infrared thermal imager can not only realize the target search of a large field of view, but also realize the tracking and identification of a small field of view for a long-distance target. Therefore, the optical system of the infrared thermal imager needs to be designed as a continuous zoom optical system to implement this function; [0003] The continuous zoom infrared optical system can always keep the target image clear during the zoom process, and can realize the transformation of any field of view within the zoom range; when applied to the airborne photoelectric pod, the system guarantees that the tracking target will not be lost during the contin...

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Problems solved by technology

[0005] In order to overcome the deficiencies in the background technology, the present invention discloses a miniaturized negative compensation medium-wave cooling infrared continuous zoom optical system, which adopts the design of negative group mechanical compensation, secondary imaging, continuous zoom, and three times of changing the system optical axis direction, reducing The length of the optical system is small, and the minimum focal length of the system is relatively large; after optical and lens design, on the premise of satisfying the imaging quality of the system, a combination of only 9 lenses is obtained, so it has a high transmittance and improves the system. Sensitivity, while effectively controlling the total length of the optical system; the use of cylindrical cams to control the movement of the zoom group and compensation group has the advantage of simple compensation structures; increasing the field of view diaphragm structure reduces the impact of stray light on system imaging and improves the system. Signal-to-noise ratio; the cold diaphragm is adopted, and the efficiency is 100%, which reduces the energy loss of the beam, suppresses the system noise, and improves the system sensitivity and signal-to-noise ratio; the direction of the optical axis of the system is changed three times by three plane mirrors, effectively shortening the optical The total length of the system; this invention meets the requirements of the airborne photoelectric pod system that has strict requirements on the volume, weight and imaging quality of the optical system, and is at the leading level of similar domestic products

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