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Optics Lens

The design of the infrared lens on January 7, 2016

by:HENGXIANG     2020-11-16
One, the characteristics of infrared optical system infrared optical system to work in the infrared wavelengths, it has the following characteristics: the infrared optical system, in the form of reflection. General optical glass opacity in the infrared wave band, so the infrared transmission under the condition of variety is not much of the material and the size is not big, generally USES the reflection form. The relative aperture of infrared optical system is larger, the goal of detection by infrared system generally far, range is big, arrived in infrared system target thermal radiation is weak, so that large aperture optical system to receive the radiation energy, and in order to make the agent side element has a relatively high irradiance, the relative aperture of optical system should also be larger. The number of infrared optical system should be less as far as possible, its thickness should be small as far as possible. This feature is to avoid the light learn yuan of infrared radiation absorption and reflection of the loss. While increase the number of lenses can improve like quality, but less used in infrared learning system. The accept element of infrared optical system is infrared detector. Infrared detector is a radiant energy converter, it will not be visible infrared radiant energy is converted into other forms of energy, usually is converted into electrical signals. Second, the design of the infrared lens in the infrared optical system, using aspheric surface. Now starting from the processing and inspection process, the aspheric mostly rotational symmetry secondary cone surface. Have other aspheric surface, such as catadioptric system for the correction of spherical mirror aberration correction board face shape and design. For axisymmetric aspheric surface, it will not increase as difference, but more variable, it is very beneficial to the design. Using aspheric can design with large relative aperture to expand field of optical system, and the thickness of the oil can make the optical system, saves expensive through infrared material, so as to reduce the cost of the infrared device. For spherical surface is completely determined by a parameter ya, so you can't do multiple tasks at the same time. If adopted more aspheric is variable. We run out of range below will show individual aspherical correction of spherical aberration.
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