Stray Light Suppression in Optical Space Experiments

C. Leinert; D. Klüppelberg

doi:10.1364/AO.13.000556

Applied Optics
Vol. 13,
Issue 3,
pp. 556-564
(1974)
•https://doi.org/10.1364/AO.13.000556

Stray Light Suppression in Optical Space Experiments

C. Leinert and D. Klüppelberg

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C. Leinert and D. Klüppelberg, "Stray Light Suppression in Optical Space Experiments," Appl. Opt. 13, 556-564 (1974)

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Abstract

Measurements of stray light suppression with mirrors, lenses, and baffle systems from four zodiacal light and one noctilucent cloud space experiments are reported. The method used to derive the total stray light suppression from these measurements is given. The predicted residual stray light intensity of about 10⁻¹¹ sr⁻¹ to 10⁻¹⁰ sr⁻¹ corresponds to ≈1% of the zodiacal light intensity and is confirmed by the available inflight results. Therefore accurate photometry of the zodiacal light is possible from a sunlit rocket or satellite.

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	R-214 15° rocket photometer	Pioneer 10 imaging photopolarimeter	Noctilucent cloud photometer	Skylab photometer 84° from sun	Helos 15° photometer

					near sun	far sun
Light source	sunlit earth	sunlit spacecraft	sun	sun	sunlit spacecraft
θ (degrees)	≥75	≥60	≥85	84	159	11
A_sc	0.1	4 × 10⁻⁴	1.0	1.0	1.0 × 10⁻³	1.0 × 10⁻³
A_b	2 × 10⁻⁶	5.0 × 10⁻⁸	2.7 × 10⁻⁹	1.7 × 10⁻⁷	7.4 × 10⁻⁸	3.6 × 10⁻⁷
S_opt (sr⁻¹)	3 × 10⁻³	3 × 10⁻¹	2.0 × 10⁻¹	7.9 × 10⁻²	4.5 × 10⁻¹	4.5 × 10⁻¹
Attenuating steps	3	4	3	2	4	4
I_stray predicted (solar fluxes per sr)	6 × 10⁻¹⁰	6.0 × 10⁻¹²	5.4 × 10⁻¹⁰	1.3 × 10⁻⁸	3.5 × 10⁻¹¹	1.6 × 10⁻¹⁰
(percent of signal)	1	+0.5	<1%	740	0.2	10
		0.5–0.3
I_stray observed (percent of signal)	≃1.5	≈0.1 (Ref. 26)	undetectable	not applicable	to be launched 1974

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Applied Optics