Optical design of the High Resolution Imaging Channel of SIMBIO-SYS

Michele Zusi; Riccardo Paolinetti; Vincenzo Della Corte; Gabriella Marra; Marco Baroni; Pasquale Palumbo; Gabriele Cremonese

doi:10.1364/AO.58.004059

Applied Optics
Vol. 58,
Issue 15,
pp. 4059-4069
(2019)
•https://doi.org/10.1364/AO.58.004059

Optical design of the High Resolution Imaging Channel of SIMBIO-SYS

Michele Zusi, Riccardo Paolinetti, Vincenzo Della Corte, Gabriella Marra, Marco Baroni, Pasquale Palumbo, and Gabriele Cremonese

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Michele Zusi, Riccardo Paolinetti, Vincenzo Della Corte, Gabriella Marra, Marco Baroni, Pasquale Palumbo, and Gabriele Cremonese, "Optical design of the High Resolution Imaging Channel of SIMBIO-SYS," Appl. Opt. 58, 4059-4069 (2019)

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Abstract

This paper describes the optical design of the High Resolution Imaging Channel (HRIC), which is part of the spectrometers and imagers for the Mercury Planetary Orbiter BepiColombo Integrated Observatory SYStem (SIMBIO-SYS) suite, for imaging and spectroscopic investigation of Mercury. The optical design has been optimized to achieve the stringent scientific requirement of 5 m ground sampling at 400 km from the planet’s surface in the harsh Mercury environment.

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Corrections

Michele Zusi, Riccardo Paolinetti, Vincenzo Della Corte, Gabriella Marra, Marco Baroni, Pasquale Palumbo, and Gabriele Cremonese, "Optical design of the High Resolution Imaging Channel of SIMBIO-SYS: publisher’s note," Appl. Opt. 58, 5310-5310 (2019)
https://opg.optica.org/ao/abstract.cfm?uri=ao-58-19-5310

21 May 2019: Typographical corrections were made to the abstract, Table 3 and Section 6.

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Parameter	Description
On-ground resolution	$< 10 m / pxl$ from 400 km of altitude
Field of view	$> 1 \deg$ (squared)
Spectral range	400–900 nm
Pupil diameter	$> 80 mm$
Filters	$1 panchromatic + 3 color filters$
Optical MTF at Nyquist frequency	$\geq 0.3$ (at $λ = 632.8 nm$ )

Surf nbr	Surface [mm]	RoC [mm]	TH [mm]	Conic Cnst
0	OBJ	Inf	Inf
1	M1–stop	−298.5	−111	−1.094
2	M2	−96.56	150.6	−3.097
3	L1 s1	−20.933	6
4	L1 s2	−22.59	0.5
5	L2 s1	28.038	6
6	L2 s2	47.142	10
7	L3 s1	−41.025	4
8	L3 s2	37.32	12.5
9	Image	Inf

Specification Versus Measured (Bold) Values
	FPAN	F550	F750	F880
$λ_{C}$ [nm]	$650 \pm 11$	$550 \pm 6$	$750 \pm 9$	$880 \pm 11$
$λ_{C}$ [nm]	652.3	549.3	752.9	880.1
$ν_{on / off}$ [nm]	400/900	530/570	730/770	860/900
$ν_{on / off}$ [nm]	399.8/904	529.8/570.2	733.7/773.3	861.7/901.5
$Δ λ$ [nm]	$500 \pm 5$	$40 \pm 2$	$40 \pm 2$	$40 \pm 2$
$Δ λ$ [nm]	504.9	40.4	39.6	39.8
$T_{p}$ [%]	$> 85$	$> 80$	$> 80$	$> 80$
$T_{p}$ [%]	98.6	99.1	99.7	98.9
$T_{o}$ [%]	$< 0.05$	$< 0.05$	$< 0.05$	$< 0.05$
$T_{o}$ [%]	0.018	0.013	0.012	0.009
$T_{o} / T_{i}$ [%]	$< 0.005$	$< 0.01$	$< 0.01$	$< 0.01$
$T_{o} / T_{i}$ [%]	0.0001	0.002	0.002	0.0011
Slope [%]	$< 2$	$< 2$	$< 2$	$< 2$
Slope [%]	1.3	0.6	0.6	0.1

Parameter	Description
Optical configuration	Ritchey–Chrétien modified with corrector
Corrector	Refractive spherical surfaces
Spectral range	400–900 nm
Entrance pupil diameter	89 mm
Angular field of view	$1.47 ° \times 1.47 °$
$F$ -number	8.9
Focal length	800 mm
IFoV	12.5 μrad/pxl
Corrector lenses’ material	Suprasil 1
CMOS matrix	$2048 \times 2048$
CMOS pixel size	$10 μm \times 10 μm$
CMOS fill factor	100%
CMOS dynamic	120 ke-

	Optical Performances
Diffraction EE in one pixel	53%		On-axis edge of the field
Diffraction EE in one pixel	51%		On-axis edge of the field
MTF at Nyquist frequency	40%	39%	On-axis edge of the field
MTF at Nyquist frequency	37%	33%	On-axis edge of the field
RMS spot diameter	2 μm		On-axis edge of the field
RMS spot diameter	2.6 μm		On-axis edge of the field
Field curvature	0.042 mm		Edge of the field
Distortion	0.06%		Edge of the field

Surface Couple	$D_{ghost}$ [mm]	$V_{r}$	I
3 versus 2	0.001506^a	0.50242	7.03E-06
27 versus 24	0.013	0.00001	3.81E-07
32 versus 31	0.042043	0.00001	3.64E-08
34 versus 31	0.12277	0.00001	4.27E-09
34 versus 32	0.081507	0.00001	9.69E-09

ID	Radius [mm]	Thick [mm]	Irregularity [fringes]	Dec [mm]	Tilt [“]
M1^a	$\pm 0.1$	$\pm 0.1$	0.2	0.015	20
M2	$\pm 0.04$	$\pm 0.1$	0.2	0.015	20
L1	$\pm 0.02$	$\pm 0.05$	0.5	$\pm 0.033$	$\pm 60$
L2	$\pm 0.02$	$\pm 0.03$	0.5	$\pm 0.033$	$\pm 60$
L3	$\pm 0.035$	$\pm 0.1$	0.5	$\pm 0.033$	$\pm 60$
Filter	none	$\pm 0.05$	$\pm 1$	$\pm 0.010$	$\pm 60$
TIRD	none	$\pm 0.05$	0.2	$\pm 0.1$	$\pm 60$

ID	Dec [mm]	Tilt [“]
M1	$\pm 0.005$	$\pm 20$
M2	$\pm 0.005$	$\pm 20$
L1	$\pm 0.025$	$\pm 60$
L2	$\pm 0.025$	$\pm 60$
L3	$\pm 0.025$	$\pm 60$
Filter^a	$\pm 0.01$	$\pm 60$

Dist [mm]	Tol [mm]
M1-M2	$\pm 0.001$
M1-L1	$\pm 0.05$
L1-L2	$\pm 0.05$
L2-L3	$\pm 0.05$
Filter-FPA	$\pm 0.01$

Field	RMS Spot Radius	Change of RMS Spot Radius
0°	0.0008	0.0004
1.037°	0.00145	0.0013
−1.037°	0.00145	0.0013

Field	Nominal Ave MTF	MTF $Design + Toll$
0°	0.399	0.39874126
1.037°	0.36	0.33845660
−1.037°	0.3605	0.31003578

b	s	l	$λ$ (nm)	(Values in RMS)
1.36436154	−2.0	0.01	400	Mirrors 20 Å
0.15018643	−2.0	0.01	400	TIRD 25 Å
0.01884602	−2.0	0.01	400	Lenses 10 Å (f_silica)
0.26950351	−2.0	0.01	900	Mirrors 20 Å
0.02727437	−2.0	0.01	900	TIRD 25 Å
0.00343754	−2.0	0.01	900	Lenses 10 Å (f_silica)
34.1090385	−2.0	0.01	400	STAVROUDIS 100 Å
6.73758786	−2.0	0.01	900	STAVROUDIS 100 Å

b	s	l	$λ$ (nm)
0.4481	−2.8225	0.0079	400	CL300 1 A
0.0001	−0.5877	0.0268	400	CL300 2 B
0.2576	−2.2974	0.0084	900	CL300 1 C
0.0002	−2.0236	0.3648	900	CL300 2 D

Stray/Signal	400 nm	900 nm
Mirror M1	$4.34 \cdot 10^{- 5}$	$1.11 \cdot 10^{- 5}$
Mirror M2	$1.03 \cdot 10^{- 4}$	$2.15 \cdot 10^{- 5}$
Lens L1	$1.03 \cdot 10^{- 5}$	$1.75 \cdot 10^{- 6}$
Lens L2	$1.22 \cdot 10^{- 5}$	$2.26 \cdot 10^{- 6}$
Lens L3	$1.087 \cdot 10^{- 5}$	$2.11 \cdot 10^{- 6}$
Filter TIRD	$4.40 \cdot 10^{- 5}$	$8.65 \cdot 10^{- 6}$
Baffle M1	$6.78 \cdot 10^{- 5}$	$6.64 \cdot 10^{- 5}$
Baffle M2	$2.34 \cdot 10^{- 6}$	$2.29 \cdot 10^{- 6}$
Support of lenses	$2.19 \cdot 10^{- 5}$	$1.99 \cdot 10^{- 5}$
Ferrule of lenses	$2.92 \cdot 10^{- 5}$	$2.65 \cdot 10^{- 5}$

Object	Scatter Fraction
Stavroudis	$5.41 \cdot 10^{- 6}$
TIRD	$2.14 \cdot 10^{- 5}$
M1	$1.68 \cdot 10^{- 5}$
M2	$1.67 \cdot 10^{- 7}$
Lenses	$4.42 \cdot 10^{- 7}$

Intermediate Count	Ratio
Scattered 1 times	$3.2 \cdot 10^{- 5}$
Scattered 2 times	$1.6 \cdot 10^{- 8}$
TOT	$3.2 \cdot 10^{- 5}$

CL	Scatter/Signal (at 900 nm)
PPM 3165 (CL 500)	$4.9 \cdot 10^{- 4}$
PPM 1265 (CL 415)	$3 \cdot 10^{- 4}$
PPM 300 (CL 306)	$6 \cdot 10^{- 5}$

Quality Index	Mounting and Manufacturing Tol	Thermal	Stray Light
RMS	$< 0.13 %$ (FoV edge)	–	–
MTF	5% (average)	$< 2.1 %$	negligible

Intermediate Count	Ratio
Scattered 1 times	$3.2 \cdot 10^{- 5}$
Scattered 2 times	$1.6 \cdot 10^{- 8}$
TOT	$3.2 \cdot 10^{- 5}$

Abstract

Corrections

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Figures (19)

Tables (17)

Equations (2)

Applied Optics