[en] PHASECam is the Large Binocular Telescope Interferometer's (LBTI) phase sensor, a near-infrared camera which is used to measure tip/tilt and phase variations between the two AO-corrected apertures of the Large Binocular Telescope (LBT). Tip/tilt and phase sensing are currently performed in the H (1.65 μm) and K (2.2 μm) bands at 1 kHz, and the K band phase telemetry is used to send tip/tilt and Optical Path Difference (OPD) corrections to the system. However, phase variations outside the range [-Π, Π] are not sensed, and thus are not fully corrected during closed-loop operation. PHASECam's phase unwrapping algorithm, which attempts to mitigate this issue, still occasionally fails in the case of fast, large phase variations. This can cause a fringe jump, in which case the unwrapped phase will be incorrect by a wavelength or more. This can currently be manually corrected by the observer, but this is inefficient. A more reliable and automated solution is desired, especially as the LBTI begins to commission further modes which require robust, active phase control, including controlled multi-axial (Fizeau) interferometry and dual-aperture non-redundant aperture masking interferometry. We present a multi-wavelength method of fringe jump capture and correction which involves direct comparison between the K band and currently unused H band phase telemetry.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Maier, E. R.; Steward Observatory, The Univ. of Arizona (United States)
Hinz, P. M.; Steward Observatory, The Univ. of Arizona (United States)
Defrere, Denis ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > ISSPSILAB
Ertel, S.; Steward Observatory, The Univ. of Arizona (United States)
Downey, E.; Steward Observatory, The Univ. of Arizona (United States))
Language :
English
Title :
A two-band approach to nλ phase error corrections with LBTI's PHASECam
Publication date :
01 July 2018
Event name :
2018 Optical and Infrared Interferometry and Imaging VI
Event date :
11 June 2018 through 15 June 2018
Audience :
International
Main work title :
Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series
Le Bouquin, J.-B., Abuter, R., Bauvir, B., Bonnet, H., Haguenauer, P., di Lieto, N., Menardi, S., Morel, S., Rantakyrö, F., Schoeller, M., Wallander, A., and Wehner, S. "Fringe tracking at VLTI: Status report, " Proc. SPIE 7013, 701318.
Petrov, R. G., Boskri, A., Bresson, Y., Agabi, K., Folcher, J.-P., Elhalkouj, T., Lagarde, S., and Benkhaldoum, Z. "Hierarchical fringe tracker to co-phase and coherence very large optical interferometers, " Proc. SPIE 9907, 99071F (2016).
Hill, J. M., Ashby, D. S., Brynnel, J. G., Christou, J. C., Little, J. K., Summers, D. M., Veillet, C., and Wagner, R. M. "The Large Binocular Telescope: Binocular all the time, " Proc. SPIE 9145, 914502 (2014).
Veillet, C., Brynnel, J., Hill, J., Wagner, R., Ashby, D., Christou, J., Little, J., and Summers, D. "LBTO's long march to full operation-step 1, " Proc. SPIE 9149, 914916 (2014).
Veillet, C., Ashby, D. S., Christou, J. C., Hill, J. M., Little, J. K., Summers, D. M., Wagner, R. M., Masciadri, E., and Turchi, A. "LBTO's long march to full operation: Step 2, " Proc. SPIE 9910, 99100S (2016).
Hinz, P. M., Defrere, D., Skemer, A., Bailey, V., Stone, J., Spalding, E., Vaz, A., Pinna, E., Puglisi, A., Esposito, S., Montoya, M., Downey, E., Leisenring, J., Durney, O., Homann, W., Hill, J., Millan-Gabet, R., Mennesson, B., Danchi, W., Morzinski, K., Grenz, P., Skrutskie, M., and Ertel, S. "Overview of LBTI: A multipurpose facility for high spatial resolution observations, " Proc. SPIE 9907, 990704 (2016).
Hinz, P. M. "Rening the LBT interferometer, " Proc. SPIE 10701 (2018). To be published in these proceedings.
Wilson, J. C., Hinz, P. M., Skrutskie, M. F., Jones, T., Solheid, E., Leisenring, J., Garnavich, P., Kenworthy, M., Nelson, M. J., and Woodward, C. E. "LMIRcam: An L/M-band imager for the LBT combined focus, " Proc. SPIE 7013, 70133A (2008).
Skrutskie, M. F., Jones, T., Hinz, P., Garnavich, P., Wilson, J., Nelson, M., Solheid, E., Durney, O., Homann, W., Vaitheeswaran, V., McMahon, T., Leisenring, J., and Wong, A. "The Large Binocular Telescope mid-infrared camera (LMIRcam): Nal design and status, " Proc. SPIE 7735, 77353H (2010).
Leisenring, J. M., Skrutskie, M. F., Hinz, P. M., Skemer, A., Bailey, V., Eisner, J., Garnavich, P., Homann, W. F., Jones, T., Kenworthy, M., Kuzmenko, P., Meyer, M., Nelson, M., Rodigas, T. J., Wilson, J. C., and Vaitheeswaran, V. "On-sky operations and performance of LMIRcam at the Large Binocular Telescope, " Proc. SPIE 8446, 8444F (2012).
Homann, W. F., Hinz, P. M., Defrere, D., Leisenring, J. M., Skemer, A. J., Arbo, P. A., Montoya, M., and Mennesson, B. "Operation and performance of the mid-infrared camera, NOMIC, on the Large Binocular Telescope, " Proc. SPIE 9147, 91471O (2014).
Defrere, D., Hinz, P., Downey, E., Ashby, D., Bailey, V., Brusa, G., Christou, J., Danchi, W. C., Grenz, P., Hill, J. M., Homann, W. F., Leisenring, J., Lozi, J., McMahon, T., Mennesson, B., Millan-Gabet, R., Montoya, M., Powell, K., Skemer, A., Vaitheeswaran, V., Vaz, A., and Veillet, C. "Co-phasing the Large Binocular Telescope: Status and performance of LBTI/PHASECam, " Proc. SPIE 9146, 914609 (2014).
Defrere, D., Hinz, P. M., Mennesson, B., Homann, W. F., Millan-Gabet, R., Skemer, A. J., Bailey, V., Danchi, W. C., Downey, E. C., Durney, O., Grenz, P., Hill, J. M., McMahon, T. J., Montoya, M., Spalding, E., Vaz, A., Absil, O., Arbo, P., Bailey, H., Brusa, G., Bryden, G., Esposito, S., Gaspar, A., Hani, C. A., Kennedy, G. M., Leisenring, J. M., Marion, L., Nowak, M., Pinna, E., Powell, K., Puglisi, A., Rieke, G., Roberge, A., Serabyn, E., Sosa, R., Stapeldfeldt, K., Su, K., Weinberger, A. J., and Wyatt, M. C. "Nulling Data Reduction and On-sky Performance of the Large Binocular Telescope Interferometer, " The Astrophysical Journal 824 (2), 66 (2016).
Ertel, S., Defrere, D., Hinz, P., Mennesson, B., Kennedy, G. M., Danchi, W. C., Gelino, C., Hill, J. M., Homann, W. F., Rieke, G., Shannon, A., Spalding, E., Stone, J. M., Vaz, A., Weinberger, A. J., Willems, P., Absil, O., Arbo, P., Bailey, V. P., Beichman, C., Bryden, G., Downey, E. C., Durney, O., Esposito, S., Gaspar, A., Grenz, P., Hani, C. A., Leisenring, J. M., Marion, L., McMahon, T. J., Millan-Gabet, R., Montoya, M., Morzinski, K. M., Pinna, E., Power, J., Puglisi, A., Roberge, A., Serabyn, E., Skemer, A. J., Stapelfeldt, K., Su, K. Y. L., Vaitheeswaran, V., and Wyatt, M. C. "The HOSTS Survey-Exozodiacal Dust Measurements for 30 Stars, " The Astronomical Journal 155 (5), 194 (2018).
Ertel, S., Hinz, P., Defrere, D., Mennesson, B., and Kennedy, G. "The HOSTS Survey for Exo-zodiacal Dust: Preliminary results and future prospects, " Proc. SPIE 10698 (2018). To be published in these proceedings.
Patru, F., Esposito, S., Puglisi, A., Riccardi, A., Pinna, E., Arcidiacono, C., Antichi, J., Mennesson, B., Defrere, D., Hinz, P. M., and Hill, J. M. "The LBTI Fizeau imager-I. Fundamental gain in high-contrast imaging, " Monthly Notices of the Royal Astronomical Society 472, 2544-2553 (2017).
Patru, F., Esposito, S., Puglisi, A., Riccardi, A., Pinna, E., Arcidiacono, C., Antichi, J., Mennesson, B., Defrere, D., Hinz, P. M., and Hill, J. M. "The LBTI Fizeau imager-II. Sensitivity of the PSF and the MTF to adaptive optics errors and to piston errors, " Monthly Notices of the Royal Astronomical Society 472, 3288-3297 (2017).
Leisenring, J. M., Hinz, P. M., Skrutskie, M., Skemer, A., Woodward, C. E., Veillet, C., Arcidiacono, C., Bailey, V., Bertero, M., Boccacci, P., Conrad, A., de Kleer, K., de Pater, I., Defrere, D., Hill, J., Hofmann, K.-H., Kaltenegger, L., Camera, A. L., Nelson, M. J., Schertl, D., Spencer, J., Weigelt, G., and Wilson, J. C. "Fizeau interferometric imaging of Io volcanism with LBTI/LMIRcam, " Proc. SPIE 9146, 91462S (2014).
Conrad, A., de Kleer, K., Leisenring, J., Camera, A. L., Arcidiacono, C., Bertero, M., Boccacci, P., Defrere, D., de Pater, I., Hinz, P., Hofmann, K.-H., Krster, M., Rathbun, J., Schertl, D., Skemer, A., Skrutskie, M., Spencer, J., Veillet, C., Weigelt, G., and Woodward, C. E. "Spatially Resolved M-band Emission from Io's Loki PateraFizeau Imaging at the 22. 8 m LBT, " The Astronomical Journal 149 (5), 175 (2015).
Conrad, A. R. "The role of Fizeau interferometry in planetary science, " Proc. SPIE 9907, 99070L (2016).
de Kleer, K., Skrutskie, M., Leisenring, J., Davies, A., Conrad, A., de Pater, I., Resnick, A., Bailey, V., Defrere, D., Spalding, E., Vaz, A., Veillet, C., and Woodward, C. "Multi-phase volcanic resurfacing at Loki Patera on Io, " Nature 545, 199-202 (2017).
Hill, J., Hinz, P., and Ashby, D. "The Large Binocular Telescope as an early ELT, " 3rd AO4ELT Conference-Adaptive Optics for Extremely Large Telescopes (2013).
Spalding, E., Hinz, P., Ertel, S., Maier, E., and Stone, J. "Towards controlled Fizeau observations with the Large Binocular Telescope, " Proc. SPIE 10701 (2018). To be published in these proceedings.
Kuzmenko, P. J., Little, S. L., Little, L. M., Wilson, J. C., Skrutskie, M. F., Hinz, P. M., Leisenring, J. M., and Durney, O. "Fabrication and testing of germanium grisms for LMIRcam, " Proc. SPIE 8450, 84503P (2012).
Sallum, S., Follette, K., Eisner, J., Close, L., Hinz, P., Kratter, K., Males, J., Skemer, A., Macintosh, B., Tuthill, P., Bailey, V., Defrere, D., Morzinski, K., Rodigas, T., Spalding, E., and Vaz, A. "Accreting protoplanets in the LkCa 15 transition disk, " Nature 527, 342-344 (2015).
Hinz, P. M., Connors, T., McMahon, T., Cheng, A., Peng, C. Y., Homann, W., McCarthy, D., and Angel, R. "Large Binocular Telescope Interferometer: The universal beam combiner, " Proc. SPIE 5491 (2004).
Hinz, P. M., Solheid, E., Durney, O., and Homann, W. F. "NIC: LBTI's nulling and imaging camera, " Proc. SPIE 7013, 701339 (2008).
Defrere, D., Hinz, P., Downey, E., Bhm, M., Danchi, W. C., Durney, O., Ertel, S., Hill, J. M., Homann, W. F., Mennesson, B., Millan-Gabet, R., Montoya, M., Pott, J.-U., Skemer, A., Spalding, E., Stone, J., and Vaz, A. "Simultaneous water vapor and dry air optical path length measurements and compensation with the large binocular telescope interferometer, " Proc. SPIE 9907, 99071G (2016).
Colavita, M. M., Booth, A. J., Garcia-Gathright, J. I., Vasisht, G., Johnson, R. L., and Summers, K. R. "Fringe Measurement and Control for the Keck Interferometer, " Publications of the Astronomical Society of the Pacific 122 (893), 795 (2010).
