Telecentric optical system of digital aerial mapping panchromatic camera

Abstract

The invention discloses a telecentric optical system of a digital aerial mapping panchromatic camera. The telecentric optical system comprises a front lens set, a middle lens set and a rear lens set which are sequentially arranged in the light incident direction from left to right; the front lens set comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged; the middle lens set comprises a fifth lens, a diaphragm, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens which are sequentially arranged; and the rear lens set comprises an eleventh lens. According to the telecentric optical system, the first piece of lens adopts a mode of combination of a reversed telephoto light path and an image space telecentric light path of positive focal power, the imaging field-of-view reaches 70 degrees, the full field-of-view average MTF is greater than or equal to 0.65@55lp / mm, the full field-of-view distortion is smaller than or equal to 0.02%, and the illumination uniformity reaches 75.8% or above. The optical system is compact in structure, and has the advantages of being good in illumination uniformity, good in imaging quality, small and light, and meanwhile, the machining and manufacturing costs of the optical system are significantly lowered.

Description

technical field [0001] The invention relates to the technical field of imaging optics, in particular to a digital aerial surveying and mapping panchromatic camera telecentric optical system. Background technique [0002] Aerial surveying and mapping cameras are mounted on airborne platforms, capable of imaging ground objects at long distances, providing high-resolution, low-distortion remote sensing image information, and are widely used in fields such as agriculture and forestry, emergency disaster reduction, and urban planning and construction. Especially in recent years, with the introduction of concepts such as "smart city" and "digital city" and the rapid development of digital cities, aerial surveying and mapping cameras can provide high-definition surveying and mapping images with large area arrays and high-resolution images with accurate positions Information can play an important role in emergency response, urban security, urban functions and spatial layout, water c...

AI Technical Summary

Problems solved by technology

In this type of design, since the illuminance distribution of the image plane is nearly proportional to the fourth power of the cosine of the field of view, the illuminance of the image plane decreases sharply with the increase of the field of view, resulting in poor uniformity of illumination of the entire image plane

The obtained image darkens rapidly when it deviates from the center of the field of view, which cannot objectively reflect the actual brightness distribution of ground objects

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