非旋轉(zhuǎn)對稱光學(xué)非球面(柱面)面形絕對檢驗技術(shù)研究
[Abstract]:Non-rotating symmetric optical aspheric elements such as cylindrical elements have unique optical properties and have been widely used in advanced optical systems such as astronomy and intense laser. However, due to its non-rotational symmetry, there is no high-precision absolute detection method. Computer-Generated Hologram-CGH can produce arbitrary wavefront and can detect the zero position interference of complex optical elements. However, the accuracy of CGH detection is limited by the existence of system error and reference error. In order to further improve the detection accuracy, the cylindrical element, a special case of non-rotational symmetric optical aspherical surface, is studied in this paper on the basis of the zero position detection technique of CGH. Based on conjugate differential interferometry, the absolute test technique of plane shape is studied. The main research contents are as follows: for a cylinder element, the design and processing of CGH for cylinder compensation are completed, the interference measurement device is built to realize the zero position interference detection of cylinder element, and the aberration in the detection process is analyzed by Chebyshev polynomial. The separation of the adjustment error is realized. The absolute surface distribution of cylinder is obtained by using many algorithms to restore the differential wavefront of measured plane. Compared with differential interferometry, conjugate differential interferometry improves the precision of surface restoration and enhances the reliability of measurement. The influence of various errors on the recovery accuracy is analyzed by superimposing the errors in the process of actual testing such as noise, adjustment and so on. By using the conjugate difference method of orthogonal bilateral symmetrical position measurement, the absolute interference detection of cylinder surface is carried out, and the clamping and adjusting mechanism with seven dimensional adjustment function is designed to realize the assembly and conjugate motion of the parts to be tested. The wavefront of the differential wave surface obtained by conjugate differential interferometry is restored to obtain the absolute surface shape of the object to be tested, and the Taylor Hobson aspheric profilometer is used to measure the specific position of the measuring piece, and the two results are compared, and the results are basically the same. The deviation of RMS value is better than 1 / 40 位 (位 = 632.8 nm).
【學(xué)位授予單位】:南京理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TH74
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