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Large-view-field passive athermalization shortwave infrared optical system

An infrared optical system and athermal aberration technology, applied in the optical field, can solve the problems of small selection range and difficult correction of chromatic aberration, and achieve the effect of compact optical system, good thermal abatement, and high imaging quality

Active Publication Date: 2015-01-21
LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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Problems solved by technology

The material selection range is relatively small, and the chromatic aberration is difficult to correct

Method used

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  • Large-view-field passive athermalization shortwave infrared optical system
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  • Large-view-field passive athermalization shortwave infrared optical system

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Embodiment Construction

[0016] The following is a detailed introduction of the large-field-of-view high-resolution passive athermal short-wave infrared optical system with reference to the accompanying drawings and specific implementation methods.

[0017] Such as figure 1 As shown, the large-field-of-view high-resolution passive athermal short-wave infrared optical system includes a first lens 1, a second lens 2, a third lens 3, an aperture stop 4, and a second lens arranged coaxially in sequence from the object space to the image space. Four lenses 5, the fifth lens 6, the sixth lens 7 and the focal plane 8 of the detector, the focal powers of the six lenses are positive, negative, positive, negative, positive, and negative in turn, the first lens is a biconcave lens, and the first lens is a biconcave lens. The front surfaces of the second, fifth and sixth lenses are all aspherical, and the other lens surfaces are all spherical; the third lens is bent towards the image side, and the fifth lens is b...

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Abstract

The invention relates to a large-view-field passive athermalization shortwave infrared optical system which comprises a first lens, a second lens, a third lens, a aperture diaphragm, a fourth lens, a fifth lens, a sixth lens and a focal plane of a detector which are in coaxial arrangement from the object side to the image side in sequence. The whole optical system meets the requirements that the focal power distribution of each lens meets total focal power requirement, meets the total color difference coefficient requirement and meets the requirement of not producing temperature defocus. By utilizing only six lenses, optical passive athermalization can be carried out on the large-view-field high-resolution shortwave infrared optical system; an aspherical lens group is introduced to correct spherical aberration and comatic aberration; by introducing three optical materials simultaneously, heat aberration is effectively corrected; and thermal constants of different materials are utilized to be cooperated with the thermal expansion coefficient of the material of a lens cone, so that defocus caused by the thermal constants of the lenses during temperature variation is allowed to be just consistent with image surface movement caused by thermal expansion coefficient of the material of the lens cone, and very good athermalization effect is achieved.

Description

technical field [0001] The invention belongs to the field of optical technology, and relates to a large-field passive athermal short-wave infrared optical system. Background technique [0002] The development of short-wave infrared imaging technology has enabled the infrared imaging band to cover three atmospheric windows located in long-wave, medium-wave and short-wave infrared. The short-wave infrared focal plane detector is a new type of infrared focal plane device. The short-wave infrared focal plane detector can use all the energy in the 0.9-2.5μm band of night sky light to significantly improve the sensitivity and operating distance of night vision equipment. The development of short-wave infrared imaging technology has filled the gap between visible light and long-wave infrared spectrum in short-wave infrared spectrum, and has its unique advantages in some applications. Short-wave infrared optical systems can be widely used in military fields and civil engineering. F...

Claims

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Application Information

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IPC IPC(8): G02B13/14G02B13/18G02B13/06G02B1/02
CPCG02B1/02G02B13/005G02B13/06G02B13/14G02B13/18
Inventor 刘环宇潘晓东常勇
Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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