Common-aperture medium-long wave infrared imaging optical system

Abstract

The invention provides a common-aperture medium-long wave infrared imaging optical system, and relates to the technical field of optics, and the main points of the technical scheme are that the common-aperture medium-long wave infrared imaging optical system comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object side to an image side along an optical axis, the second lens has negative focal power; the third lens has positive focal power; the fourth lens has negative focal power; the focal power of the first lens is phi 1, the focal power of the whole optical system is phi, and phi 1 / phi is larger than or equal to 0.4 and smaller than or equal to 0.75. The focal power of the second lens is phi 2, and phi 2 / phi is more than or equal to-0.65 and less than or equal to-0.35; the combined focal power of the third lens and the fourth lens is phi 34, and phi 34 / phi is larger than or equal to 1.05 and smaller than or equal to 1.25. The common-aperture medium-long wave infrared imaging optical system provided by the invention has the advantages that the complete common-path design of medium-wave infrared and long-wave infrared is realized, the spatial size of the optical system is reduced, and the optical system has large-relative-aperture imaging capability, high light gathering capability and excellent imaging quality.

Description

technical field [0001] The present application relates to the field of optical technology, and in particular, to a common-aperture mid- and long-wave infrared imaging optical system. Background technique [0002] The use of mid-wave infrared and long-wave infrared detection is a commonly used detection method. However, in the traditional scheme, a single optical lens is basically used to achieve single-spectrum imaging. With the development of technology, infrared dual-color detectors can Simultaneously output mid-wave infrared and long-wave infrared images, thus reducing the complexity of the optical system, but this also brings great difficulty to the design and development of the optical system, because it means that the optical system needs to integrate mid-wave infrared and long-wave infrared The ultra-broadband information is collected on the target surface of the detector. Therefore, the current dual-wave detection optical system has problems such as low light gatheri...

AI Technical Summary

Problems solved by technology

[0002] The use of medium-wave infrared and long-wave infrared for detection is a commonly used detection method. However, in the traditional scheme, a single optical lens is basically used to achieve single-spectrum imaging. With the development of technology, infrared dual-color detectors can Simultaneously output mid-wave infrared and long-wave infrared images, thus reducing the complexity of the optical system, but this also brings great difficulty to the design and development of the optical system, because it means that the optical system needs to integrate mid-wave infrared and long-wave infrared The ultra-broadband information is collected on the target surface of the detector. Therefore, the current dual-wave detection optical system has problems such as low light-gathering ability, low resolution, and unsatisfactory imaging effects.

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