Sensitivity analysis of test methods for aspheric off-axis mirrors

Ahn, Kwangsu; Kim, Youngsoo; Lee, Sungho; Park, Kwijong; Kyeong, Jaemann; Park, Byeong-Gon; Park, Chan; Lyo, A-Ran; Yuk, In-Soo; Chun, Moo-Young

doi:10.1016/j.asr.2011.01.022

Cited by 4 publications

(4 citation statements)

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“…To measure the shape error of the off-axis aspheric surface at a high accuracy, researchers have offered several useful methods [3][4][5][6][7][8][9][10][11][12][13]. Wang Xiao-kun tested an off-axis ellipsoid mirror with sub-aperture stitching interferometry and applied least-squares fitting to process the test data, resulting in a 1.275λ of PV and 0.113λ of RMS [4].…”

Section: Introductionmentioning

confidence: 99%

“…Although this method belongs to the auto-collimation measurement method, the adjustment processing is difficult [7]. Similarly, Ki-Beom Ahn used a spherical convex reference mirror as the aiding element to detect the ellipsoid mirror, which was the secondary mirror of the Giant Magellan Telescope (GMT) [8]. Due to the diameter of this ellipsoid (up to 1.06 m), the aperture size of the spherical convex reference mirror would reach 0.99 m, leading to serious difficulties in the fabrication of this aiding element.…”

Section: Introductionmentioning

confidence: 99%

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The Methods and Experiments of Shape Measurement for Off-Axis Conic Aspheric Surface

Zhang

Liu

et al. 2020

Materials

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The off-axis conic aspheric surface is widely used as a component in modern optical systems. It is critical for this kind of surface to obtain the real accuracy of the shape during optical processing. As is widely known, the null test is an effective method to measure the shape accuracy with high precision. Therefore, three shape measurement methods of null test including auto-collimation, single computer-generated hologram (CGH), and hybrid compensation are presented in detail in this research. Although the various methods have their own advantages and disadvantages, all methods need a special auxiliary component to accomplish the measurement. In the paper, an off-axis paraboloid (OAP) was chosen to be measured using the three methods along with auxiliary components of their own and it was shown that the experimental results involved in peak-to-valley (PV), root-mean-square (RMS), and shape distribution from three methods were consistent. As a result, the correctness and effectiveness of these three measurement methods were confirmed, which are very useful in engineering.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Methods and Experiments of Shape Measurement for Off-Axis Conic Aspheric Surface

Zhang

Liu

et al. 2020

Materials

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“…1,2 Off-axis parabolic surface is a typical shape among the off-axis aspheric surfaces and it plays a significant role in such fields as laser collimator, precision measurement instrument and astronomical telescope. 3,4 An off-axis parabolic surface can be regarded as a part of rotation-symmetrical surface with a large off-axis value when it is rotated around the axis of the parabolic surface, whereas it also can be seen as a non-rotational symmetric surface when it is rotated around the axis of the cylindrical surface. These characters bring out a hard choice for machining an off-axis parabolic surface, especially for a parabolic surface with a large off-axis value.…”

Section: Introductionmentioning

confidence: 99%

Analysis and comparison of two different ultra-precision manufacturing methods for off-axis parabolic mirror with single point diamond turning

Zhao

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part B:

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Off-axis aspheric mirror is an important component widely used in optical system and precision measurement instrument. Off-axis parabolic surface is one typical shape of off-axis aspheric mirrors which can enlarge focal length and widen field-of-view. Two typical ultra-precision turning methods which are turning the cylindrical blank by revolving around the axis of parabolic surface (TPS) and revolving around the axis of cylindrical surface (TCS) are analyzed and compared for off-axis parabolic surface in this article. Three-axis (X, Z, C) turning machine is applied and kinematic analyses of two linear axes (X, Z) are studied during cutting with the single point diamond turning. The tool paths are generated and installation errors are analyzed under two different conditions. Primary experiments are conducted to verify the effectiveness of theoretical analyses. The obtained results demonstrate that the surface machined with TPS method has better machining quality than the one machined with TCS method.

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“…The mirror model was drawn from the Magellan secondary mirror model, and it was analyzed by NOAO and KASI (Kim et al 2009, Ahn et al 2011. The results are shown in Fig.…”

Section: Fabrication Of An Off-axis Mirrormentioning

confidence: 99%

Prototype Development for the GMT FSM Secondary - Off-axis Aspheric Mirror Fabrication -

Kim¹,

Kim²,

Song³

et al. 2014

Journal of Astronomy and Space Sciences

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Sensitivity analysis of test methods for aspheric off-axis mirrors

Cited by 4 publications

References 24 publications

The Methods and Experiments of Shape Measurement for Off-Axis Conic Aspheric Surface

The Methods and Experiments of Shape Measurement for Off-Axis Conic Aspheric Surface

Analysis and comparison of two different ultra-precision manufacturing methods for off-axis parabolic mirror with single point diamond turning

Prototype Development for the GMT FSM Secondary - Off-axis Aspheric Mirror Fabrication -

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