Cassini composite infrared spectrometer: correcting an offset error and refining the pointing parameters for the midinfrared detectors

John C. Pearl; Conor A. Nixon; Donald E. Jennings; Donald E. Jennings; Shahid Aslam; Simon Calcutt; Monte S. Kaelberer; Monte S. Kaelberer; Nicolas Gorius; Nicolas Gorius; Richard K. Achterberg; Richard K. Achterberg; Paul N. Romani; Gordon L. Bjoraker; Michael Flasar

doi:10.1364/AO.491970

Applied Optics
Vol. 62,
Issue 22,
pp. 5882-5888
(2023)
•https://doi.org/10.1364/AO.491970

Cassini composite infrared spectrometer: correcting an offset error and refining the pointing parameters for the midinfrared detectors

John C. Pearl, Conor A. Nixon, Donald E. Jennings, Shahid Aslam, Simon Calcutt, Monte S. Kaelberer, Nicolas Gorius, Richard K. Achterberg, Paul N. Romani, Gordon L. Bjoraker, and Michael Flasar

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John C. Pearl, Conor A. Nixon, Donald E. Jennings, Shahid Aslam, Simon Calcutt, Monte S. Kaelberer, Nicolas Gorius, Richard K. Achterberg, Paul N. Romani, Gordon L. Bjoraker, and Michael Flasar, "Cassini composite infrared spectrometer: correcting an offset error and refining the pointing parameters for the midinfrared detectors," Appl. Opt. 62, 5882-5888 (2023)

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Abstract

Based on preflight laboratory testing, an unexpectedly large positional offset between the two midinfrared (mid-IR) detector arrays in the Cassini composite infrared spectrometer (CIRS) instrument has been noted in the literature. A much smaller offset was measured in-flight. We investigate this discrepancy by estimating several spatial relationships among the detectors and comparing these results with three independent data sets. This enables us to infer the probable cause of this offset and to derive a new reduced value. We comment on the effect that this change could have on previously published results involving CIRS data. We also present a graphical display of the arrays projected on the sky as CIRS would see it.

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Corrections

2 August 2023: Corrections were made to Tables 4 and 7.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Tables (8)

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Alignment #	Start Time (h)	Detector	Y (µm)	Z (µm)
A	10:20
	11:55	PV01	−2049	−1995
	13:00	PV10	−2070	−60
B	13:45
	16:00	PC01	−1368	−116
	16:30	PC10	−1364	−2059
C	17:05
	17:56	PC10	−1363	−2064
	18:10	PC01	−1372	−128
	19:05	PV01	−2053	−2049
	19:25	PV10	−2067	−119

Alignment #	Array	Array Length (µm)	Deviation from Average Length (µm)
A	PV10-PV01	1935	−1
B	PC01-PC10	1943	$+ 7$
C	PV10-PV01	1930	−6
C	PC01-PC10	1936	0

Alignment #	Array	Z-offset (µm)	Average Z-offset (µm)	SSD
A&B	PV10-PC01	56	60	5.7
A&B	PV01-PC10	64
C&C	PV10-PC01	9	12	4.2
C&C	PV01-PC10	15

Alignment #	Array	Z-offset (µm)	Average Z-offset (µm)	SSD
B&C	PV10-PC01	−3	3.5	9.2
B&C	PV01-PC10	10	3.5	9.2

FP4 (PV)			FP3 (PC)
Detector #	X (mrad)	Z (mrad)	Detector #	X (mrad)	Z (mrad)
10	2.207	1.268	1	1.237	1.254
9	2.168	1.002	2	1.226	0.972
8	2.162	0.718	3	1.224	0.676
7	2.175	0.408	4	1.224	0.386
6	2.158	0.125	5	1.228	0.097
5	2.167	−0.164	6	1.230	−0.192
4	2.181	−0.459	7	1.229	−0.487
3	2.167	−0.758	8	1.221	−0.787
2	2.169	−1.056	9	1.226	−1.080
1	2.184	−1.349	10	1.216	−1.381

Evaluation	Z-offset (mrad)	“Detector” Offset	Normalized to Nixon et al.’s Evaluation
Oxford alignment C data	$0.016 \pm 0.006$	$0.054 \pm 0.020$	$\sim 0.17$
In-flight	$0.028 \pm 0.007$	$0.095 \pm 0.024$	$\sim 0.29$
Nixon et al. [5]	0.096	0.33	1

Parameter	Value (mrad)	CIRS PDS Database (CO-S-CIRS-2/3/4-TSDR-V4.0)^a (mrad)
Detector pitch, $Δ d$	$0.295 \pm 0.005$	0.300
Center location of FP3 (X, Z)	( $1.23 \pm 0.01$ , $- 0.054 \pm 0.005$ )	–
Center location of FP4 (X, Z)	( $2.17 \pm 0.05$ , $- 0.026 \pm 0.005$ )	–
Location of CIRS boresight (FPB^b)	( $1.70 \pm 0.02$ , $- 0.04 \pm 0.0035$ )	–
Separation between FP3 and FP4 arrays, $Δ X$	$0.94 \pm 0.05$	0.94
Z-offset between FP4 and FP3 detector arrays, $Δ Z$	$0.028 \pm 0.007$	0

Design Value	Nixon et al.	1996 Oxford Scan Record, Alignment C	Smith In-Flight Calibration	CIRS Pre-Ship Review	CIRS PDS Database (CO-S-CIRS-2/3/4-TSDR-V4.0)^a
Detector pitch, $Δ d$
215 µm	–	$214.8 \pm 0.5 µ m$ ^b	–	–	–
0.294 mrad	–	$0.294 \pm 0.001 m r a d$	$0.295 \pm 0.005 m r a d$ ^c	$0.297 \pm 0.02 m r a d$ ^d,^e	0.3 mrad
Z-offset between FP4 and FP3 detector arrays, $Δ Z$
0 µm	70 µm^f $64.9 \pm 3.4 µ m$ ^g	$12.0 \pm 4.2 µ m$ ^b	–	–	–
0 mrad	0.096 mrad $0.089 \pm 0.005 m r a d$	$0.016 \pm 0.006 m r a d$	$0.028 \pm 0.007 m r a d$ ^h	$< 0.03 m r a d$ ^d	0 mrad
Spacing between FP4 and FP3 arrays, $Δ X$
700 µm	–	$692.5 \pm 3.5 µ m$ ^b	–	–	–
0.957 mrad	$0.950 \pm 0.008 m r a d$ ^g	$0.947 \pm 0.005 m r a d$	$0.94 \pm 0.05 m r a d$ ^c $0.948 \pm 0.013 m r a d$ ^h	$0.962 \pm 0.22 m r a d$ ^d,ⁱ	0.94 mrad

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Applied Optics