Boresight calibration of FIFI-LS: In theory, in the lab and on sky

Sebastian Colditz; Randolf Klein; Simon Beckmann; Aaron Bryant; Christian Fischer; Fabio Fumi; Norbert Geis; Rainer Hönle; Alfred Krabbe; Leslie W. Looney; Albrecht Poglitsch; Walfried Raab; Sarah E. Ragan; Felix Rebell; Maureen L. Savage

doi:10.1117/12.2055335

Boresight calibration of FIFI-LS: In theory, in the lab and on sky

Sebastian Colditz, Randolf Klein, Simon Beckmann, Aaron Bryant, Christian Fischer, Fabio Fumi, Norbert Geis, Rainer Hönle, Alfred Krabbe, Leslie W. Looney, Albrecht Poglitsch, Walfried Raab, Sarah E. Ragan, Felix Rebell, Maureen L. Savage

Astronomy

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The Field-Imaging Far-Infrared Line-Spectrometer (FIFI-LS) entered service on the Stratospheric Observatory for Infrared Astronomy (SOFIA) on March 2014. Exact pointing of the instrument is important. The SOFIA telescope provides an absolute pointing stability of 1" rms, which is sufficient for FIFI-LS. The instrument boresight relative to the telescope reference system is established with accuracy better than 1". FIFI-LS has a built-in rotating K-Mirror to derotate the instrument field of view. Perfect alignment of the optical axis of the K-Mirror and the optical axis of the optical systems in both instrument channels is practically impossible. The remaining offsets result in a dependence of the instrument boresight on the K-Mirror position. Therefore a boresight calibration model is established for each channel. With these models the instrument boresight is calculated and transferred to the telescope control software. Achieving precise calibration of the boresight has been an ongoing process including the first optical models of the instrument, measurements in different laboratories and finally measurements during the commissioning flight series. In this paper, the approach used to calibrate FIFI-LS's boresight is explained. This includes the model used and an overview of the laboratory, as well as the in-flight measurements leading to the calibrated boresight model.

Original language	English (US)
Title of host publication	Ground-Based and Airborne Instrumentation for Astronomy V
Editors	Suzanne K. Ramsay, Ian S. McLean, Hideki Takami
Publisher	SPIE
ISBN (Electronic)	9780819496157
DOIs	https://doi.org/10.1117/12.2055335
State	Published - 2014
Event	Ground-Based and Airborne Instrumentation for Astronomy V - Montreal, Canada Duration: Jun 22 2014 → Jun 26 2014

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	9147
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Other

Other	Ground-Based and Airborne Instrumentation for Astronomy V
Country/Territory	Canada
City	Montreal
Period	6/22/14 → 6/26/14

Keywords

FIFI LS
FIFI-LS
Far-infrared
Image Rotator
Integral Field Spectroscopy
SOFIA
Spectrometer

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

Online availability

10.1117/12.2055335

Library availability

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Cite this

Colditz, S., Klein, R., Beckmann, S., Bryant, A., Fischer, C., Fumi, F., Geis, N., Hönle, R., Krabbe, A., Looney, L. W., Poglitsch, A., Raab, W., Ragan, S. E., Rebell, F., & Savage, M. L. (2014). Boresight calibration of FIFI-LS: In theory, in the lab and on sky. In S. K. Ramsay, I. S. McLean, & H. Takami (Eds.), Ground-Based and Airborne Instrumentation for Astronomy V Article 91474S (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9147). SPIE. https://doi.org/10.1117/12.2055335

Boresight calibration of FIFI-LS: In theory, in the lab and on sky. / Colditz, Sebastian; Klein, Randolf; Beckmann, Simon et al.
Ground-Based and Airborne Instrumentation for Astronomy V. ed. / Suzanne K. Ramsay; Ian S. McLean; Hideki Takami. SPIE, 2014. 91474S (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9147).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Colditz, S, Klein, R, Beckmann, S, Bryant, A, Fischer, C, Fumi, F, Geis, N, Hönle, R, Krabbe, A, Looney, LW, Poglitsch, A, Raab, W, Ragan, SE, Rebell, F & Savage, ML 2014, Boresight calibration of FIFI-LS: In theory, in the lab and on sky. in SK Ramsay, IS McLean & H Takami (eds), Ground-Based and Airborne Instrumentation for Astronomy V., 91474S, Proceedings of SPIE - The International Society for Optical Engineering, vol. 9147, SPIE, Ground-Based and Airborne Instrumentation for Astronomy V, Montreal, Canada, 6/22/14. https://doi.org/10.1117/12.2055335

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abstract = "The Field-Imaging Far-Infrared Line-Spectrometer (FIFI-LS) entered service on the Stratospheric Observatory for Infrared Astronomy (SOFIA) on March 2014. Exact pointing of the instrument is important. The SOFIA telescope provides an absolute pointing stability of 1{"} rms, which is sufficient for FIFI-LS. The instrument boresight relative to the telescope reference system is established with accuracy better than 1{"}. FIFI-LS has a built-in rotating K-Mirror to derotate the instrument field of view. Perfect alignment of the optical axis of the K-Mirror and the optical axis of the optical systems in both instrument channels is practically impossible. The remaining offsets result in a dependence of the instrument boresight on the K-Mirror position. Therefore a boresight calibration model is established for each channel. With these models the instrument boresight is calculated and transferred to the telescope control software. Achieving precise calibration of the boresight has been an ongoing process including the first optical models of the instrument, measurements in different laboratories and finally measurements during the commissioning flight series. In this paper, the approach used to calibrate FIFI-LS's boresight is explained. This includes the model used and an overview of the laboratory, as well as the in-flight measurements leading to the calibrated boresight model.",

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AU - Colditz, Sebastian

AU - Klein, Randolf

AU - Beckmann, Simon

AU - Bryant, Aaron

AU - Fischer, Christian

AU - Fumi, Fabio

AU - Geis, Norbert

AU - Hönle, Rainer

AU - Krabbe, Alfred

AU - Looney, Leslie W.

AU - Poglitsch, Albrecht

AU - Raab, Walfried

AU - Ragan, Sarah E.

AU - Rebell, Felix

AU - Savage, Maureen L.

PY - 2014

Y1 - 2014

N2 - The Field-Imaging Far-Infrared Line-Spectrometer (FIFI-LS) entered service on the Stratospheric Observatory for Infrared Astronomy (SOFIA) on March 2014. Exact pointing of the instrument is important. The SOFIA telescope provides an absolute pointing stability of 1" rms, which is sufficient for FIFI-LS. The instrument boresight relative to the telescope reference system is established with accuracy better than 1". FIFI-LS has a built-in rotating K-Mirror to derotate the instrument field of view. Perfect alignment of the optical axis of the K-Mirror and the optical axis of the optical systems in both instrument channels is practically impossible. The remaining offsets result in a dependence of the instrument boresight on the K-Mirror position. Therefore a boresight calibration model is established for each channel. With these models the instrument boresight is calculated and transferred to the telescope control software. Achieving precise calibration of the boresight has been an ongoing process including the first optical models of the instrument, measurements in different laboratories and finally measurements during the commissioning flight series. In this paper, the approach used to calibrate FIFI-LS's boresight is explained. This includes the model used and an overview of the laboratory, as well as the in-flight measurements leading to the calibrated boresight model.

AB - The Field-Imaging Far-Infrared Line-Spectrometer (FIFI-LS) entered service on the Stratospheric Observatory for Infrared Astronomy (SOFIA) on March 2014. Exact pointing of the instrument is important. The SOFIA telescope provides an absolute pointing stability of 1" rms, which is sufficient for FIFI-LS. The instrument boresight relative to the telescope reference system is established with accuracy better than 1". FIFI-LS has a built-in rotating K-Mirror to derotate the instrument field of view. Perfect alignment of the optical axis of the K-Mirror and the optical axis of the optical systems in both instrument channels is practically impossible. The remaining offsets result in a dependence of the instrument boresight on the K-Mirror position. Therefore a boresight calibration model is established for each channel. With these models the instrument boresight is calculated and transferred to the telescope control software. Achieving precise calibration of the boresight has been an ongoing process including the first optical models of the instrument, measurements in different laboratories and finally measurements during the commissioning flight series. In this paper, the approach used to calibrate FIFI-LS's boresight is explained. This includes the model used and an overview of the laboratory, as well as the in-flight measurements leading to the calibrated boresight model.

KW - FIFI LS

KW - FIFI-LS

KW - Far-infrared

KW - Image Rotator

KW - Integral Field Spectroscopy

KW - SOFIA

KW - Spectrometer

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BT - Ground-Based and Airborne Instrumentation for Astronomy V

A2 - Ramsay, Suzanne K.

A2 - McLean, Ian S.

A2 - Takami, Hideki

PB - SPIE

Y2 - 22 June 2014 through 26 June 2014

ER -

Boresight calibration of FIFI-LS: In theory, in the lab and on sky

Abstract

Publication series

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Keywords

ASJC Scopus subject areas

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