Overview of Active Support Technology for Main Mirror of Segmented Telescopes

Name	Action position	Action method	Adjustment range	Adjustment DOF
Keck	Delta frame	Manual/elastic blade	Four items of Zernike	30
TMT	Pivot of delta frame	Displacement actuator/elastic blade	Six items of Zernike	18
E-ELT	Pivot of delta frame	Force actuator/torsion spring	Six items of Zernike	27

Table 2. Main adjustment parameters of radius of curvature actuation system in JWST
View table
Table 2. Main adjustment parameters of radius of curvature actuation system in JWST
Description Capability
Adjustment range capability/mm ＞10 or ＜-10
Adjustment resolution/mm 0.0004
Induced surface deformation 24 nm RMS per mm ROC actuation

Table 3. Main mirror parameters of some segmented telescopes

View table

Table 3. Main mirror parameters of some segmented telescopes

Name	Keck	GMT	TMT	E-ELT	LAMOST	JWST	LUVOIR-A
Working environment	Foundation	Foundation	Foundation	Foundation	Foundation	Space-based	Space-based
Number	36	7	492	798	37	18	120
Material	Zerodur	E6	Glass-ceramic	Glass-ceramic	Glass-ceramic	Be	ULE quartz glass
Diameter /m	1.8	8.4	1.2	1.45	1.1	1.52	1.412
Thickness /mm	75	704	40	50	75	59
Supporting system/Adjustment DOF	WH/30	165	WH/18	WH/27	-	ROCAS	-
Positioning system	3DOF	6DOF	3DOF	3DOF	3DOF	6DOF	6DOF
Positioning accuracy	3.8 μm	1 μm	1.2 nm	3 nm	-	3 nm	1 pm
Adjustment method	Manual position	Auto	Auto	Auto	Auto	Auto	Auto
Correction effect(RMS)	19 nm	10 nm	30 nm	10 nm	16.6 nm	20 nm	10 pm

Tools

Get Citation

Copy Citation Text

Wu Songhang, Dong Jihong, Xu Shuyan, Xu Boqian. Overview of Active Support Technology for Main Mirror of Segmented Telescopes[J]. Laser & Optoelectronics Progress, 2021, 58(3): 3000061

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites