Diffractive optical elements are widely used in optical systems due to their excellent dispersion characteristics. Precision molding technology is an effective way to solve mass optical processing. Based on the precise molding of the chalcogenide glass diffractive optics, in this paper microstructure filling and process parameter sensitivity of diffractive optical elements are analyzed. The research results show that the use of appropriate process parameters can ensure the filling of diffractive microstructures. The cooling rate in the slow cooling stage is the most important factor affecting the surface shape.
The primary mirror component is an important part of the Cassegrain system. As the first-stage imaging component, the RMS surface error directly affects the image quality of the whole optical system. In this article, taking the primary mirror component of a certain type of Cassegrain aerial camera as the research object, the factors affecting the RMS precision of the primary mirror surface are analyzed in detail from aspects of back supporting structure design, platen elastic crimping design, simulation analysis, test verification and so on. Using the finite element method to simulate the primary mirror supporting structure, analyzes the influence on the primary surface error by the three-point supporting structure in different positions. Furthermore, analyzes the variations of the primary mirror surface error under the influence of three-point supporting structure and pressure plate. The last but not the least, analyzes the primary mirror surface error under the different pressure conditions, concludes the optimal supporting point position and the excellent elastic compression. After the primary mirror assembling, through test verification, the RMS is 0.0270λ, which is better than the original design requirement of λ/35(0.0286λ). And the RMS variation between before and after assembling is less than 0.005λ. Performing the high and low temperature test on the primary component, after test, the RMS values is 0.0269λ, it proves that the primary frame structure and its axial supporting structure have little effects on the RMS precision of the primary mirror. It can also meet the requirement of the large-aperture primary mirror surface in the co-optical system under complex conditions. The feasibility of the structure design has been verified.
In modern street battle, counter-sniper operations have become the main issue. However, due to the strong unidirectionality of laser beam, it is necessary to shape the laser beam to became useful. At the same time, in order to improve the detection efficiency, the energy of the laser beam is required to be as concentrated as possible, and the detection range is as wide as possible. Therefore, for meeting the requirements, comparing cylindrical with free-form surface prism on the shaping affection The result shows best shaping effect is achieved by using the free-form surface prism. In order to ensure that the laser energy loss is small, the manufracturing processing of freeform prism is analyzed. PSD(power spectral density) characteristics of the optical element surface and its influencing factors are discussed. So as to achieve the laser detection efficiency and detection distance requirements.
With the development of optical components towards low surface damage and low scattering characteristics, more and more attention has been paid to the surface integrity of optical components. Grinding is a common rough machining process for precision optical components, and its surface quality affects the subsequent polishing efficiency and the surface integrity of optical components directly. Therefore, in this paper, studies the grinding surface morphology of ZF62 optical glass material from many aspects such as grinding wheel modeling, surface formation mechanism, and abrasive movement analysis. The paper models the grinding wheel based on the power spectral density (PSD) of the grinding wheel surface, and verifies the effectiveness of the modeling method through experiments. Basing on analyzing the surface roughness with different grinding parameters, there are conclusions as follow: The modeling of the grinding wheel surface based on PSD could effectively simulate and analyze the grinding surface of the grinding wheel. Both the simulation experiment and the actual experiment show that the consistency of the trend. The surface roughness decrease with the increasing of the grinding speed and increase with the increasing of feed rate and the grinding depth.
KEYWORDS: Zoom lenses, Mirrors, Modulation transfer functions, Diffraction, Objectives, Lenses, Imaging systems, Error control coding, Calibration, Control systems
In order to meet the requirements of high imaging quality and high resolution for high magnification continuous zoom TV, the main factors affecting the imaging quality are analyzed. The effects of eccentricity on the MTF of the optical system were analyzed by CODE V optical software. According to the analysis results, the lenses of the former group are most sensitive to the optical system and have the greatest influence on the image quality of the system. The tolerance value of the center deviation control of the lens is determined. Aiming at each lens of the front mirror group, a centering structure of the micro stress adhesive lens is proposed. The center error control method of lens is realized by optical axis calibration technology. As the moving component of the system, the zoom lens group and the compensation lens group are the key factors affecting the system image quality during the zooming process. It is proposed that the mechanical centering method is used to make the axis of motion consistent with the axis of the front mirror group. Then, The optical axes of the zoom group, compensation mirror group, rear mirror group, and front mirror group are consistent by a reflective optical centering method. By comparing the test results with the theory, the accuracy and feasibility of the center deviation control method are verified, and the design requirements of the system are satisfied.
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