Cost relationships for nonconventional telescope structural configurations

Aden Baker Meinel

doi:10.1364/JOSA.72.000014

Journal of the Optical Society of America
Vol. 72,
Issue 1,
pp. 14-20
(1982)
•https://doi.org/10.1364/JOSA.72.000014

Cost relationships for nonconventional telescope structural configurations

Aden Baker Meinel

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Aden Baker Meinel, "Cost relationships for nonconventional telescope structural configurations," J. Opt. Soc. Am. 72, 14-20 (1982)

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Abstract

Fast primary mirrors offer the possibility of using endostructure designs rather than the conventional exostructure designs. A parametric analysis indicates that considerable cost savings can be achieved in this manner for large optical telescopes. f/1 endostructures are compared with classical and quasi-classical f/2.75 exostructure telescopes. The multiple mirror telescope configuration is the lowest-cost design for equal aperture area, but when equal light is considered, it is comparable with the segmented monolith design.

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	Exostructure		Endostructure

Telescope Elements	Quasi-conventional (f/2.75)	6-Monolith (f/1.0)	Monolith		MMT (f/1.0)

			Central Post (f/1.0)	Serrurier Truss (f/1.0)
S	20.5	5.2	5.2	5.2	5.2
W	2.0	0.8	0.8	0.8	0.8
a_E	1.5	1.5	1.5	1.5	1.5
M_E	1260	32	32	32	32
D_M	18.0	20.5	16.4	16.4	20.5
T_M	2.3	2.0	2.0	2.0	1.8
b_M	0.7	0.7	0.7	0.7	0.7
c	0.5	0.4	0.4	0.5	0.2
M_M	782	823	527	565	635
M_C	–	176	120	144	131
M_O	2042	1031	679	741	798

	Exostructure		Endostructure

Telescope Elements	Quasi-conventional (f/2.75)	6-Monolith (f/1.0)	Monolith		MMT (f/1.0)

			Central Post (f/1.0)	Serrurier Truss (f/1.0)
S_F	29.5	11.5	11.5	11.5	11.0
W_F	11.0	7.5	7.5	7.5	7.5
H_F	23.0	12.0	12.0	12.0	10.5
a_F	0.7	0.7	0.7	0.7	0.7
M_F	5224	724	724	724	606
W_N	10.0	10.0	10.0	10.0	10.0
T_N	1.6	1.4	1.4	1.4	1.4
L_N	13.0	9.0	9.0	9.0	9.0
b_N	0.4	0.4	0.4	0.4	0.4
M_W	166	101	101	101	101
M_A	5390	825	825	825	707

	Exostructure		Endostructure

Telescope Elements	Quasi-conventional (f/2.75)	6-Monolith (f/1.0)	Monolith		MMT (f/1.0)

			Central Post (f/1.0)	Serrurier Truss (f/1.0)
D_B	14.0	10.5	10.5	10.5	10.5
H_B	9.5	3.8	3.8	3.8	3.4
c_B	0.5	0.4	0.4	0.4	0.4
M_B	931	168	168	168	150

	Exostructure		Endostructure

Telescope Elements	Quasi-conventional (f/2.75)	6-M (f/1.0)	Monolith		MMT (f/1.0)

			Central Post (f/1.0)	Serrurier Truss (f/1.0)
R_S	26.50	23.00	19.00	20.00	13.50
D_M	18.0	20.5	16.4	16.4	20.5
T_D	2.65	2.30	1.90	2.00	1.35
H_D	57.50	37.80	33.80	34.80	22.10
a_D	1.5	1.5	1.5	1.5	1.5
M_D	16228	8672	5240	5888	2126

	Exostructure			Endostructure

	Conventional (f/2.75)	Quasi-conventional (f/2.75)	6-M (f/1.0)	Monolith		MMT (f/1.0)

				Central Post (f/1.0)	Serrurier Truss (f/1.0)
M_O	4650	2042	1031	679	741	798
M_A	12280	5390	825	825	825	707
M_B	2120	931	168	168	168	150
M_T	19050	8363	2024	1672	1734	1655
M_D	16228	16228	8672	5240	5888	2126

	Telescope			Building/Dome

Configuration	Mass (metric tons)	K ($/kg)		Mass (metric tons)	K ($/kg)

		1980$	1990$		1980$	1990$
Conventional	19050	14.8	38.4	16228	5.0	13.0
Quasi-conventional	8363	17.0	44.0	16228	5.0	13.0
6-M	2404	20.9	54.2	8672	5.5	14.4
Monolith (central post)	1672	22.2	57.6	5240	6.0	15.7
Monolith (Serrurier truss)	1734	22.1	57.2	5888	5.9	15.4
MMT	1655	22.2	57.7	2126	7.0	18.2

	Conventional (f/2.75)	Quasi-conventional (f/2.75)	6-M (f/1.0)	Monolith		MMT (f/1.0)

				Central Post (f/1.0)	Serrurier Truss (f/1.0)
Telescope	731.5	368.0	130.3	96.3	99.2	95.5
Optics	150.0	51.9	51.9	51.9	51.9	51.9
Building	211.0	211.0	124.9	82.3	90.7	38.7
Project total	1092.5	630.9	307.1	230.5	241.8	186.1

Reflectance	Cost
MMT (equal aperture)	186.1
MMT (equal light)
r = 0.85	284.0
r = 0.90	244.7
r = 0.95	212.6

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Journal of the Optical Society of America