Research on the Initial Adjustment Method of the Ring Segmented Primary Mirror Based on Laser Tracker

Hui YANG; Yichun DAI; Xu TAN; Kunyan WANG; Bin WANG; Dehua YANG; Zhenyu JIN

doi:10.3788/gzxb20255408.0822003

Acta Photonica Sinica, Volume. 54, Issue 8, 0822003(2025)

Research on the Initial Adjustment Method of the Ring Segmented Primary Mirror Based on Laser Tracker

Hui YANG^1,2, Yichun DAI^1、*, Xu TAN^1,2, Kunyan WANG^1,2, Bin WANG¹, Dehua YANG³, and Zhenyu JIN¹

Author Affiliations

¹Astronomical Technology Laboratory， Yunnan Observatories， Chinese Academy of Sciences， Kunming 650216， China

²University of Chinese Academy of Sciences， Beijing 100049， China

³Nanjing Institute of Astronomical Optics and Technology， Chinese Academy of Sciences，Nanjing 210042， China

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Figures & Tables(12)

Fig. 1. The overall structure of CGST and the layout of the edge sensor and displacement actuators on the primary mirror

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Fig. 2. Schematic diagram of the local coordinate system and degrees of freedom of the segmented （taking the outer ring segmented as an example）

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Fig. 3. The surface shape of the outer ring segmented under errors in different in-plane degrees of freedom

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Fig. 4. The impact of in-plane degrees of freedom errors on the overall performance of the primary mirror

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Fig. 5. The layout of the segmented fixed points and the schematic diagram of the local coordinate system

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Fig. 6. The 800 mm ring segmented mirror active optics experimental system and the schematic diagram of the actuators and LVDT

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Fig. 7. The definition of the local coordinate system of the segmented in the 800 mm ring segmented mirror system and the fixed points A， B， and C

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Fig. 8. Comparison of the Tip， Tilt， and Piston obtained from the laser tracker with the results from the LVDT

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Table 1. The aberrations corresponding to in-plane degrees of freedom errors （The aberrations are expressed in terms of Zernike polynomial coefficients， unit： nm， normalized to the root mean square surface error）
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Table 1. The aberrations corresponding to in-plane degrees of freedom errors （The aberrations are expressed in terms of Zernike polynomial coefficients， unit： nm， normalized to the root mean square surface error）
In-plane degrees of freedom errors Defocus Astigmatism（0°） Astigmatism（45°） Coma（0°） Coma（90°）
$D x = 0.1 m m$ 0 0 -2.7 0 0
$D y = 0.1 m m$ -3.8 2.6 0 0 0
$C l o c k i n g = 1'$ 0 0 -28.4 -1.6 0

Table 2. The measurement accuracy of the 6 degrees of freedom under different working distances of the laser tracker and different systematic errors

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Table 2. The measurement accuracy of the 6 degrees of freedom under different working distances of the laser tracker and different systematic errors

Systematic errors $/ m m$	Working distances of the laser tracker $/ m$	$T i p / (')$	$T i l t / (')$	$P i s t o n / μ m$	$C l o c k i n g / (')$	$D x / μ m$	$D y / μ m$
0	8	0.45	0.26	43.52	0.48	44.94	43.56
	16	0.97	0.56	93.30	1.03	96.33	93.33
	24	1.31	0.77	127.47	1.39	131.64	127.58
0.01	8	0.57	0.33	64.58	0.57	56.89	52.78
	16	0.95	0.56	109.14	1.03	97.04	101.67
	24	1.32	0.77	135.38	1.38	131.65	129.78
0.05	8	1.27	1.08	116.31	1.19	120.69	118.41
	16	1.73	0.88	165.96	1.78	171.72	173.54
	24	1.65	0.95	133.01	1.81	190.75	147.22

Table 3. The discrepancy between the out-of-plane degrees of freedom measured by the laser tracker and the results obtained from the LVDT measurements
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Table 3. The discrepancy between the out-of-plane degrees of freedom measured by the laser tracker and the results obtained from the LVDT measurements
Serial number $1$ $2$ $3$ $4$ $5$ $6$ 7 8 9 10
$T i p / (')$ -1.17 -0.68 -0.07 -0.23 -0.09 -0.08 0.33 -0.48 0.12 0.03
$T i l t / (')$ -0.24 -0.49 0.14 -0.16 0.13 -0.29 0.29 -0.35 0.18 -0.16
$P i s t o n / μ m$ 16.67 11.75 -10.54 21.78 -20.03 29.22 -13.97 -1.89 -15.99 15.04

Table 4. Comparison of the out-of-plane degrees of freedom measurable by the laser tracker and their theoretical accuracy in the absence of systematic errors
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Table 4. Comparison of the out-of-plane degrees of freedom measurable by the laser tracker and their theoretical accuracy in the absence of systematic errors
Out-of-plane degrees of freedom Tip Tilt Piston
Measured accuracy $\pm 1.23'$ $\pm 0.75'$ $\pm 50.00 μ m$
Theoretical accuracy $\pm 1.51'$ $\pm 0.71'$ $\pm 24.87 μ m$

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Hui YANG, Yichun DAI, Xu TAN, Kunyan WANG, Bin WANG, Dehua YANG, Zhenyu JIN. Research on the Initial Adjustment Method of the Ring Segmented Primary Mirror Based on Laser Tracker[J]. Acta Photonica Sinica, 2025, 54(8): 0822003

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Paper Information

Category:

Received: Feb. 19, 2025

Accepted: Mar. 26, 2025

Published Online: Sep. 26, 2025

The Author Email: Yichun DAI (daiyichun@ynao.ac.cn)

DOI:10.3788/gzxb20255408.0822003

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. The aberrations corresponding to in-plane degrees of freedom errors （The aberrations are expressed in terms of Zernike polynomial coefficients， unit： nm， normalized to the root mean square surface error）

Table 1. The aberrations corresponding to in-plane degrees of freedom errors （The aberrations are expressed in terms of Zernike polynomial coefficients， unit： nm， normalized to the root mean square surface error）

Table 2. The measurement accuracy of the 6 degrees of freedom under different working distances of the laser tracker and different systematic errors

Table 2. The measurement accuracy of the 6 degrees of freedom under different working distances of the laser tracker and different systematic errors

Table 3. The discrepancy between the out-of-plane degrees of freedom measured by the laser tracker and the results obtained from the LVDT measurements

Table 3. The discrepancy between the out-of-plane degrees of freedom measured by the laser tracker and the results obtained from the LVDT measurements

Table 4. Comparison of the out-of-plane degrees of freedom measurable by the laser tracker and their theoretical accuracy in the absence of systematic errors

Table 4. Comparison of the out-of-plane degrees of freedom measurable by the laser tracker and their theoretical accuracy in the absence of systematic errors