Sun blind ultraviolet camera lens

Abstract

The invention discloses a solar blind ultraviolet camera lens, which comprises a diaphragm, a first lens, a second lens, a second reflector, a first reflector, a third lens, an ultraviolet band pass filter and an image surface which are coaxially arranged from object space to image space in sequence, wherein the first lens and the second lens are positive lenses, while the third lens is a negative lens; front and back surfaces of the first lens, the second lens and the third lens are spherical surfaces which are convenient to process; reflecting surfaces of the second reflector and the first reflector are spherical surfaces which are convenient to process; and the center of the first reflector is provided with a transmission hole. The solar blind ultraviolet camera lens has the advantages of simple structure, convenient manufacture, large transmission aperture and high resolving power, and is applicable to corona detection.

Description

technical field [0001] The invention relates to a sun-blind ultraviolet camera lens for corona detection. Background technique [0002] A large part of the electromagnetic waves generated by high-voltage equipment and high-voltage transmission line corona discharge belongs to ultraviolet rays, and most of them have a wavelength of 280-400nm, and a small part of them have a wavelength of 240-280nm. The latter is called the sun-blind ultraviolet band. Detecting targets that emit solar-blind ultraviolet light can avoid the interference of the solar background, and the accuracy rate is very high. This is because a section of the solar spectrum (240-280nm) is strongly absorbed by the ozone layer, and the sunlight in this band on the ground is basically is missing. As a camera for corona detection, the front-end optical imaging system, that is, the ultraviolet camera lens is indispensable. [0003] Existing ultraviolet camera lens has reflective type and transmissive type two ki...

AI Technical Summary

Problems solved by technology

[0006] 2. It is difficult to ensure the uniformity of the material and the stress is difficult to eliminate;

[0007] 3. In order to reduce various aberrations and ensure the image quality, it is necessary to adopt a combination design of multiple lenses, which has a complex structure

Currently disclosed catadioptric structures, such as the rear end of the lens in patent CN 2784959Y, use lenses of two materials to glue together, the structure is not simple enough, and the materials of the 4 transmissive lenses used are K9 and ZF1 glass, which are difficult to pass through For solar-blind UV, the transmittance of 10mm K9 glass has dropped to 0.5% at 280nm, and the transmittance of 10mm ZF1 glass has dropped to 1.5% at 330nm. The lens structure is neither streamlined, nor can it pass through solar-blind ultraviolet rays, and cannot be used as an ultraviolet lens

[0010] Although the patent CN 101201450A can be imaged in a part of solar-blind ultraviolet (250-280nm), it has two problems: (1) It is relatively difficult to install and fix the primary reflector, and it is inevitable that dust will enter the lens when it is used on the ground, affecting The use of lens; (2) The achromatic correction lens group is composed of three lenses, and the structure is not simple enough

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