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Large-view-field ultra-long lens cone monitoring lens for high-temperature combustion furnace

A high-temperature combustion and large field of view technology, applied in the optical field, can solve the problems of enlarged beam aberration and shortened optical structure, and achieve the effects of reducing volume, reducing production cost, and reducing aperture

Active Publication Date: 2021-02-02
NANJING COLLEGE OF INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing technology shows that the larger the field of view of the lens, the shorter the focal length. The shortening of the focal length is conducive to the shortening of the entire optical structure, and the off-axis wide beam aberration produced by the large field of view lens will become larger. The resulting on-axis and off-axis aberrations are quite a job in themselves

Method used

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  • Large-view-field ultra-long lens cone monitoring lens for high-temperature combustion furnace
  • Large-view-field ultra-long lens cone monitoring lens for high-temperature combustion furnace

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Embodiment approach 1

[0028] In the lens structure of Embodiment 1, the full field of view 2w≥90°, the focal length f'=5mm; the relative aperture D / f'=1 / 5, where D is the diameter of the entrance pupil; the object distance L=5000 mm, and the rear working distance is 27.4mm, the total length of the optical system is 258 mm. The image height of the full field of view can fully match the industrial imaging camera with a 2 / 3-inch CCD chip. The MTF value of the transfer function of each field of view at a frequency of 50 line pairs / mm can reach more than 0.7, and the resolution of the lens is excellent.

[0029] According to the market demand, the focal length of the lens is scaled proportionally. The range of optical performance parameters of the lens structure of this application: full field of view 2w≥90°, focal length f'=4mm~6mm; relative aperture D / f '=1 / 4.5~1 / 5.6, where D is the diameter of the entrance pupil; the object distance L=4500 mm to 5500 mm, the rear working distance is 26 mm to 28 mm...

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Abstract

The invention discloses a large-view-field ultra-long lens cone monitoring lens for a high-temperature combustion furnace, and the lens comprises a lens body which is sequentially provided with an optical quartz glass flat plate 1, a negative meniscus lens 2, a negative meniscus lens 3, a biconcave lens 4, a positive meniscus lens 5, a fixed diaphragm A, a biconcave lens 6-1, a biconvex lens 6-2 and a plano-convex lens 7 along the incident direction of light, wherein the biconcave lens 6-1 and the biconvex lens 6-2 form a doublet lens group 6. According to the lens structure, the maximum fullfield of view is 90 degrees, the total length of the optical structure exceeds 250 mm when the focal length of the monitoring lens meets the object-image relationship of a limited distance according to actual needs, and the lens structure can be completely matched with an industrial imaging camera of a CMOS or CCD chip with the specification of 1 / 2 inch to 1 inch within the full field of view image height adjustment range.

Description

technical field [0001] The invention belongs to the field of optical technology, in particular to a monitoring lens with a large field of view and an ultra-long lens barrel for a high-temperature combustion furnace. Background technique [0002] Industrial high-temperature combustion furnaces have to go through processes such as feeding, combustion, and slag removal during operation. The combustion temperature in the furnace can generally reach about 800°C. Technical measures such as adding catalysts and pressurizing oxygen are taken to complete full combustion. Patent CN208418798U discloses a fire viewing hole for convenient observation, which is installed at the reserved fire viewing hole of the combustion furnace, and the combustion situation in the furnace can be observed through the fire viewing hole. This structure is convenient and fast, and can ensure that the heat in the furnace will not be lost, but Observers need to be close to the furnace to observe, the observat...

Claims

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Application Information

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IPC IPC(8): G02B13/06G03B17/55G03B30/00
CPCG02B13/06G03B17/55
Inventor 陈钰刘浩孙可
Owner NANJING COLLEGE OF INFORMATION TECH
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