A flip-type medium-wave two-speed infrared optical system

Abstract

The invention discloses a flip medium-wave two-gear infrared optical system which includes a zoom objective lens group, a reflector group and a secondary imaging rear group in sequence along the optical axis. The zoom objective lens group is composed of a primary objective lens, a secondary objective lens I, a secondary objective lens II, a zoom lens I, a zoom lens II and a focusing lens in sequence. The reflector group is composed of a first reflector and a second reflector which deflect the optical path 90 degrees. The secondary imaging rear group is composed of a first rear group lens, a second rear group lens and a third rear group lens, and finally images an image formed by the zoom objective lens group on a target surface of a detector. The aperture diaphragm of the optical system isjust at the cold diaphragm of the detector, and 100% of cold diaphragm efficiency can be achieved, so that external stray light is prevented from being irradiated on the target surface of the detector, and the quality of imaging is improved. The flip medium-wave two-gear infrared optical system has the advantages of large relative aperture, compact structure, short zoom time, good image quality,clear imaging, and the like. In addition, the optical lens rate of the long-focus end is high, and the system has excellent target identification ability.

Description

technical field [0001] The patent of the invention belongs to the field of optical technology, and specifically relates to a large relative aperture compact flip-type mid-wave two-speed infrared optical system, which can be widely used in cooling type mid-wave infrared focal plane detectors. Background technique [0002] In recent years, infrared thermal imaging technology has developed rapidly. Due to its many excellent features, such as passive reception of infrared radiation, high concealment, and no electronic interference by the enemy; high precision; easy-to-observe images, etc. Temperature, power line inspection, border security and other fields have been widely used. [0003] The infrared optical system is an important part of the infrared thermal imager by collecting the external infrared radiation energy and finally focusing it on the target surface of the detector. Infrared optical systems can be roughly divided into fixed focus, two-speed, multi-speed and contin...

AI Technical Summary

Problems solved by technology

[0005] At present, there are some problems in the axial movement and zoom infrared optical system with two gears that have been widely used at present, such as long zoom time, easy to cause target loss, poor optical axis stability, etc.

[0006] In addition, the relative aperture of the existing two-stage infrared optical system is mainly 1:4. In rainy or hazy weather, the target detection ability of this type of lens is greatly limited

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