Continuous-focusing reflex infrared radiometer incidence lens

Abstract

The invention discloses a continuous-focusing reflex infrared radiometer incidence lens. A guide rail is arranged on the inner wall of a lens cone. An aspheric primary mirror is arranged inside the lens cone. The edge of the aspheric primary mirror matches the guide rail. The aspheric primary mirror can linearly slide along the guide rail. A secondary mirror is arranged behind the aspheric primary mirror inside the lens cone. The middle of the aspheric primary mirror is provided with a through hole which is in the same axis as the secondary mirror. A focusing mechanism not covering the through hole is arranged on the aspheric primary mirror, and the aspheric primary mirror is dragged by the focusing mechanism to linearly slide inside the lens cone. By dragging the aspheric primary mirror through the focusing mechanism to linearly slide forward or backward inside the lens cone, the distance between the primary and secondary mirrors is changed, and simple, flexible and highly stable lens focusing is realized. Compared with the prior art, there is no need to rotate the aspheric primary mirror, asymmetry error produced in the process of rotation is avoided, the whole structure is easy to operate and assemble and is of high stability, and a good focusing effect is achieved.

Description

technical field [0001] The invention relates to the field of incident lenses, in particular to a reflective infrared radiometer incident lens capable of continuous focus adjustment. Background technique [0002] In infrared radiometers and infrared spectroradiometers, the incident lens is the receiving and converging unit. In order to improve the utilization rate, the reflection type is generally used. In order to facilitate accurate testing of target infrared radiation, it is necessary to adjust the focus of the incident lens for targets at different distances. The zoom system is a system in which the focal length can be continuously changed and the image plane remains stable. Its image quality can be maintained during the zooming process. The zoom system changes the focal length while maintaining the stability of the image plane. After the system is designed and processed, the focal length of each component is fixed, so the focal length can only be changed by changing the...

AI Technical Summary

Problems solved by technology

However, at present, in infrared radiometers and infrared spectroradiometers, fixed focal length lenses are mostly used, such as figure 1 As shown, its application is limited. There is also a method of focusing by rotating the primary mirror, and the distance between the primary and secondary mirrors is changed by rotating the thread between the primary mirror and the lens barrel. However, this method is prone to asymmetrical errors during the rotation process, resulting in test results large error

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