In order to realize the measurement of the micro relative displacement of the optical components in the vibration environment, first of all, the vibration type of the electro-optical pod was analyzed. The relative micro displacement between the mirror and the frame in the vibration environment was simulated, especially the primary mirror component, which affects the imaging of the optical system by the reflector components. Then, a set of micro displacement measurement devices is designed to make it possible for measuring micro displacement in vibration environment with high precision. The relative displacement of the mirror and the frame in the primary component of an optical system is measured by the devices, the experimental measurement results are consistent with the simulation results. The high-precision measurement of the micro displacement of the optical components in the vibration environment is realized, which proves the effectiveness and correctness of the measurement devices and the method. On the basis of the accurate measurement of micro displacement, measurements to reduce the relative displacement between the mirror and the frame in the vibration environment are proposed, which provides an optimization direction for the improvement of the imaging quality of the optical system.
The assembly positioning state of the imaging detector has an important influence on the performance of the photoelectric reconnaissance system. The axial positioning accuracy of the imaging detector will affect the imaging clarity and resolution, and the radial positioning accuracy will affect the optical axis consistency of the optical path system. The tilt, translation, rotation and position of the detector will bring multi-dimensional errors during the installation of the imaging detector, resulting in image plane misalignment, image blur and optical axis offset. In this paper, an optical measurement system is designed and built, which can automatically distinguish the installation error of the imaging detector and assist the installation of the imaging detector. The translation installation error is less than 0.015mm, and the rotation deflection error is less than 0.015 ', and the installation qualification can be given according to the clarity of the observation system image.
According to the difficulty of cutting the ZTC4 material, slot cutting experiments were designed and three directional dynamic milling force were obtained. Instantaneous milling force model and multiple linear regression was used to analyze three directional milling force coefficients and edge milling force coefficients. To evaluate the performance of the dynamic milling force model, a new slot cutting experiment was designed. The comparison of simulations and experiments indicates the average milling force error are 5.74%, 3.93%, 7.98%, the dynamic milling force prediction model fits well in cycle, trend and amplitude. The feasibility and accuracy of the model for predicting the instantaneous milling force is verified.
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.
It was an effective way to keep the pivotal element of the lens under a specific temperature in order to increase the detection sensitivity, so that the thermocurrent caused by thermal radiation of the lens itself could be control under a lower level, But it was difficult to decide which element was the correct one and what was the temperature should be kept. To solve this problem, we, We used LightTools to simulate the cold optical lens deign and established a calculation and analysis method. which can be applied to the analysis of most infrared systems and has universal applicability.
An centering alignment technique of collimation lens group based on the optical axis of primary mirror is introduced in this paper, so as to meet up with the deviation requirements in the assembly of high-quality Common Path Optical system. A non-aberration system is designed in the first place in order to analyse the conjunction between the Wave-front aberration and eccentric error,then construct the simulation model of cassegrain system and collimation lens group based on test result,formed the eccentric error mapping relationship between the two variables. The collimation lens group is then assembied and aligned on the basis of the axis of the aspheric primary mirror. The technique has been verified through both simulative tests and actual measurements, and the results suggest the eccentric error is less than 0.04mm, and the Common Path Optical system Wave-front aberration RMS less than 0.03um.
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