In order to solve the problems of limited clear viewing range and small field angle of the existing night vision equipment, a large numerical aperture zoom night vision objective is designed combined with the zoom optical imaging technology. The night vision zoom objective designed uses a lens with large curvature on the first surface to achieve large field of view detection. The aspheric surface is added to improve the imaging quality of the system and reduce the weight of the system, so that users can have a better user experience when using the objective lens. The operating band of the objective lens is 436nm-656nm, the focus range is 4.5mm-40mm, and the maximum field angle can reach 74°. Finally, through simulation analysis, the MTF (Modulation Transfer Function) of the system at Nyquist frequency under different focal lengths is greater than 0.3, and the imaging quality is good. Through stray light analysis, it is found that the designed system is less affected by stray light in the central field of view and the half field of view, while the edge field of view is more affected by stray light.
With the improvement of optical lens manufacturing and processing capabilities, the surface shape of optical components is becoming more and more complex, such as asymmetric double-sided off-axis aspheric lenses. Generally, people use two different surface detection equipment to detect this type of optical surface, which is inefficient and not universal. Thus in this paper, we present a dull Compensation method based on Spatial Light Modulator. In this method, we detected an asymmetric double-sided off-axis aspheric mirror with convex and concave surfaces with just one detection equipment. For the concave surface, the residual wave aberration is 0.0002λ (Peak to Valley), for the convex surface, the residual wave aberration is 0.0097λ (Peak to Valley). The result shows that this method is feasible in testing asymmetric double-sided off-axis aspheric lenses.
Small F-number optical system often used in night vision devices. However, in some extreme cases, the common transmission optical system has a certain energy loss and the signal-to-noise ratio of the system is insufficient. In this paper, we design an off-axis three-mirror optical system, which F-number is 1.5, the focal length is 250mm, the field of view is 6°. Considering to reduce the difficulty of processing and adjusting, the primary mirror and third mirror are put on the same lens substrate. The result shows that in a relatively loose tolerance, the MTF of the system is higher than 0.6 at 40 line pairs, which has good imaging quality and meets the design requirements.
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