Nimbus Limb Radiometer, Apollo Fine Sun Sensor, and Skylab Multispectral Scanner

Jerome C. Kollodge; John R. Thomas; Robert A. Weagant

doi:10.1364/AO.11.002169

Nimbus Limb Radiometer, Apollo Fine Sun Sensor, and Skylab Multispectral Scanner

Jerome C. Kollodge, John R. Thomas, and Robert A. Weagant

Applied Optics
Vol. 11,
Issue 10,
pp. 2169-2176
(1972)
•https://doi.org/10.1364/AO.11.002169

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Jerome C. Kollodge, John R. Thomas, and Robert A. Weagant, "Nimbus Limb Radiometer, Apollo Fine Sun Sensor, and Skylab Multispectral Scanner," Appl. Opt. 11, 2169-2176 (1972)

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About this Article
History
- Original Manuscript: March 6, 1972
- Published: October 1, 1972

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Abstract

Examples of three different types of electrooptical systems developed by the Honeywell Radiation Center for NASA are described. One is a multichannel infrared (~15 μρ radiometer that will permit temperature and constituent inferences over the globe; it carries a one-year supply of cryogenics for the trimetal infrared detectors. The second is the Apollo telescope mount fine sun sensor, a tracking device making use of solar radiation and the transmission near critical angle of refraction, that will track within ±2 sec of arc to a designated point on the sun. The final example is the Skylab S-192 multispectral (thirteen channels from 0.4 μ to 12 μρ mapper for a variety of earth resources applications.

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Commanded angle (sec of arc)	Yaw Primary		Yaw Redundant		Pitch Primary		Pitch Redundant

	Data samples	Mean error	Data samples	Mean error	Data samples	Mean error	Data samples	Mean error
+1450	3	+2.0	2	+0.6	6	−2.3	5	+0.4
+1200	3	+1.3	2	+1.3	6	+0.1	6	+0.9
+900	3	+1.5	3	+1.4	6	−0.2	6	+0.1
+600	3	+2.0	3	+1.5	7	+1.8	6	+0.2
+300	3	+0.2	2	+2.0	6	+0.2	6	+1.5
−300	3	+0.8	2	−0.9	10	+1.6	7	+0.4
−600	3	+2.3	2	−1.3	6	+0.4	5	+0.4
−900	1	+2.6	2	+0.1	3	+0.8	3	+0.4
−1200	1	−2.6	3	+0.1	4	+2.3	2	+0.9
−1450	1	−0.7	1	+2.0	6	+3.0	2	−3.0

Commanded angle		Error (see of arc)	Error (see of arc)
A1	0 min	—	— —
	5 min	−0.2	0
	10 min	−0.3	+0.1
	15 min	−0.2	+0.2
	20 min	−0.2	−0.7
	24.21 min	−0.8	−2.5
A2	0 min	—	—
	5 min	−0.2	0
	10 min	+0.2	+0.3
	15 min	+0.1	+0.1
	20 min	−0.1	−1.5
	24.21 min	+1.6	−3.8
A3	0 min	—	—
	5 min	+0.3	0
	10 min	+0.4	−0.5
	15 min	+0.1	+0.2
	20 min	−2.2	+0.2
	24.21 min	−4.5	−0.1
A3	0 min	—	—
	5 min	+0.6	−0.1
	10 min	+0.6	0
	15 min	+1.0	+0.3
	20 min	−0.2	+0.5
	24.21 min	−1.6	+0.4

(1)	0.41–0.46
(2)	0.46–0.51
(3)	0.52–0.56
(4)	0.56–0.61
(5)	0.62–0.67
(6)	0.68–0.76
(7)	0.78–0.88
(8)	0.98–1.08
(9)	1.09–1.19
(10)	1.20–1.30
(11)	1.55–1.75
(12)	2.10–2.35
(13)	10.2–12.5

Commanded angle (sec of arc)	Yaw Primary		Yaw Redundant		Pitch Primary		Pitch Redundant

	Data samples	Mean error	Data samples	Mean error	Data samples	Mean error	Data samples	Mean error
+1450	3	+2.0	2	+0.6	6	−2.3	5	+0.4
+1200	3	+1.3	2	+1.3	6	+0.1	6	+0.9
+900	3	+1.5	3	+1.4	6	−0.2	6	+0.1
+600	3	+2.0	3	+1.5	7	+1.8	6	+0.2
+300	3	+0.2	2	+2.0	6	+0.2	6	+1.5
−300	3	+0.8	2	−0.9	10	+1.6	7	+0.4
−600	3	+2.3	2	−1.3	6	+0.4	5	+0.4
−900	1	+2.6	2	+0.1	3	+0.8	3	+0.4
−1200	1	−2.6	3	+0.1	4	+2.3	2	+0.9
−1450	1	−0.7	1	+2.0	6	+3.0	2	−3.0

Commanded angle		Error (see of arc)	Error (see of arc)
A1	0 min	—	— —
	5 min	−0.2	0
	10 min	−0.3	+0.1
	15 min	−0.2	+0.2
	20 min	−0.2	−0.7
	24.21 min	−0.8	−2.5
A2	0 min	—	—
	5 min	−0.2	0
	10 min	+0.2	+0.3
	15 min	+0.1	+0.1
	20 min	−0.1	−1.5
	24.21 min	+1.6	−3.8
A3	0 min	—	—
	5 min	+0.3	0
	10 min	+0.4	−0.5
	15 min	+0.1	+0.2
	20 min	−2.2	+0.2
	24.21 min	−4.5	−0.1
A3	0 min	—	—
	5 min	+0.6	−0.1
	10 min	+0.6	0
	15 min	+1.0	+0.3
	20 min	−0.2	+0.5
	24.21 min	−1.6	+0.4

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