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Prime Focus Spectrograph (PFS): the metrology camera system

Wang, Shiang-Yu and Chou, Chueh-Yi and Chang, Yin-Chang and Huang, Pin-Jie and Karr, Jennifer and Yan, Chi-Hung and Gunn, James E. and Loomis, Craig and Lupton, Robert and Siddiqui, Hassan and Hsu, Shu-Fu and Hu, Yen-Shan and Reiley, Daniel J. and Tamura, Naoyuki and Moritani, Yuki and Takato, Naruhisa (2020) Prime Focus Spectrograph (PFS): the metrology camera system. In: Ground-based and Airborne Instrumentation for Astronomy VIII. Proceedings of SPIE. No.11447. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 1144784. ISBN 9781510636811. https://resolver.caltech.edu/CaltechAUTHORS:20210111-074336274

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Abstract

The Prime Focus Spectrograph (PFS) is a new optical/near-infrared multi-fiber spectrograph designed for the prime focus of the 8.2m Subaru telescope. PFS will cover a 1.3 degree diameter field with 2394 fibers to complement the imaging capabilities of Hyper SuprimeCam. To retain high throughput, the final positioning accuracy between the fibers and observing targets of PFS is required to be less than 10 µ m. The metrology camera system (MCS) serves as the optical encoder of the fiber positioners for configuring of fibers. The MCS locates at the Cassegrain focus of the Subaru telescope to cover the whole focal plane with one 50M pixel CMOS sensor. The information from MCS will be fed into the fiber positioner control system for closed loop control. The MCS was delivered to Subaru Observatory in Apr. 2018 and it had two engineering runs in Oct. 2018 and Aug. 2019. The 1st engineering run concluded that the original mirror supports need to be improved to provide better image quality. The newly designed mirror supports were installed before the 2nd engineering run. The 2nd engineering run result shows that the MCS overall position accuracy is better than 4μm and the image processing time is less than 4 seconds. The MCS is ready for the system integration with other PFS components.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2561191DOIArticle
ORCID:
AuthorORCID
Lupton, Robert0000-0003-1666-0962
Additional Information:© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE). We gratefully acknowledge support from the Funding Program for World-Leading Innovative R&D on Science and Technology(FIRST) "Subaru Measurements of Images and Redshifts (SuMIRe)", CSTP, Japan for PFS project. The work in ASIAA, Taiwan is supported by the Academia Sinica of Taiwan.
Funders:
Funding AgencyGrant Number
Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST)UNSPECIFIED
Council for Science and Technology Policy (CSTP)UNSPECIFIED
Academia SinicaUNSPECIFIED
Subject Keywords:Metrology, CMOS sensor, multi-fiber, spectrograph, Schmidt telescope
Series Name:Proceedings of SPIE
Issue or Number:11447
Record Number:CaltechAUTHORS:20210111-074336274
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210111-074336274
Official Citation:Shiang-Yu Wang, Chueh-Yi Chou, Yin-Chang Chang, Pin-Jie Huang, Jennifer Karr, Chi-Hung Yan, James E. Gunn, Craig Loomis, Robert Lupton, Hassan Siddiqui, Shu-Fu Hsu, Yen-Shan Hu, Daniel J. Reiley, Naoyuki Tamura, Yuki Moritani, and Naruhisa Takato "Prime Focus Spectrograph (PFS): the metrology camera system", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 1144784 (13 December 2020); https://doi.org/10.1117/12.2561191
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107389
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:11 Jan 2021 17:12
Last Modified:11 Jan 2021 17:12

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