Shortwave Infrared Broadband Apochromatic Square Telecentric Telescopic Objective

Abstract

The invention discloses a short-wave infrared wide-band apochromatism image space telecentric teleobjective. The short-wave infrared wide-band apochromatism image space telecentric teleobjective is a coaxial transmission-type optical system with a working wave band of 1.0 to -2.5 micrometers, and comprises eight spherical lenses sequentially including three positive meniscus lenses, one negative meniscus lens, one biconcave negative lens, one positive meniscus lens and two biconvex positive lenses along a light incidence direction, wherein a diaphragm is positioned between the fourth lens and the fifth lens, the first seven lenses all bend towards the diaphragm, and the eighth lens enables principle rays of an image space to vertically irradiate to an image surface in a manner of being parallel to an optical axis. The short-wave infrared wide-band apochromatism image space telecentric teleobjective disclosed by the invention has a wide range of suitable wave bands, is compact in structure and small in spherical aberration, has a small second-order spectrum, has spherochromatic aberration and chromatic distortion which are far smaller than those of one picture element, is uniform in image surface illumination, has a telecentric image space and imaging quality which are close to a diffraction limit, is low in processing and manufacturing cost, high in energy utilization ratio, strong in light gathering power and good in thermal adaptability, is easy to install, regulate and detect, and can be applied to military and civil fields of space remote sensing, machine vision, agriculture and forestry detection, and the like.

Description

technical field [0001] The invention relates to a short-wave infrared wide-band apochromatic image square telecentric telescopic objective lens, which can be applied to night vision, reconnaissance and monitoring, space remote sensing, machine vision, agriculture and forestry monitoring and other fields. Background technique [0002] Short-wave infrared refers to the infrared band with a wavelength range of 1 μm to 2.5 μm. It can provide information that visible light, low-light night vision, medium-wave, and long-wave infrared cannot provide, making the details more prominent. Short-wave infrared radiation is ubiquitous to all objects. In terms of application, in addition to being used in military fields such as night vision, reconnaissance and surveillance, and space remote sensing, short-wave infrared telescopic objectives can also be used in nondestructive testing, industrial multispectral imaging analysis, resource remote sensing, infrared astronomy, transportation, med...

AI Technical Summary

Problems solved by technology

However, the existing short-wave infrared telescopic objective lens has many shortcomings mentioned above, and the cost is relatively high, so it is not suitable for the current short-wave infrared detector.

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