Design and construction of the fibre system for FMOS

Murray, Graham J.; Dodsworth, George N.; Content, Robert; Tamura, Naoyuki

doi:10.1117/12.790411

Cited by 7 publications

(4 citation statements)

References 4 publications

(2 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The final step for the cable itself is the stranding. The stranding method bases on in-house development for the FMOS and PFS projects (Murray et al, [5], [6]). Using a planetary stranding machine, 11 conduits (10 for the science cables, 1 for three sky fibres) are wound together before a thin plastic tape finishes it off.…”

Section: Industrialisation Of the Conduit Manufacturementioning

confidence: 99%

Design and production of the DESI fibre cables

Schmoll

Besuner

Bramall

et al. 2018

Ground-Based and Airborne Instrumentation for Astronomy VII

Self Cite

View full text Add to dashboard Cite

The Dark Energy Spectroscopic Instrument (DESI) is under construction to measure the expansion history of the Universe using the Baryonic Acoustic Oscillation technique. The spectra of 35 million galaxies and quasars over 14000 sq deg will be measured during the life of the experiment. A new prime focus corrector for the KPNO Mayall telescope will deliver light to 5000 fibre optic positioners. The fibres in turn feed 10 broad-band spectrographs. We will describe the design and production progress on the fibre cables, strain relief system and preparation of the slit end. In contrast to former projects, the larger scale of production required for DESI requires teaming up with industry to find a solution to reduce the time scale of production as well as to minimise the stress on the optical fibres.

show abstract

Section: Industrialisation Of the Conduit Manufacturementioning

confidence: 99%

Design and production of the DESI fibre cables

Schmoll

Besuner

Bramall

et al. 2018

Ground-Based and Airborne Instrumentation for Astronomy VII

Self Cite

View full text Add to dashboard Cite

show abstract

“…Each Connector Support has 12 units of multi-fibers Usconec Ferrule 32F. [02] Each Cable A starts at the Support Connector, and is then divided into two units which form two bundles of optical fibers, until they reach the Strain Relief Boxes where other bundles of optical fibers are formed, now protected by segmented tubes. These bundles are disassembled inside Tiny SRB and the optical fibers are linearly arranged on Slit curved surface, finishing Cable A.…”

Section: Figure 6: Schematic View Of Cable Amentioning

confidence: 99%

“…10. Cable B, like in FMOS instrument [02] , is the cable permanently installed at the telescope structure, composing the longest cable of the system, around 57 meters. This cable is, basically, a conduit tube containing several plastic tubes inside (segmented tubes) through which the groups of optical fibers are protected.…”

Section: Cable Bmentioning

confidence: 99%

Fiber optical cable and connector system (FOCCoS) for PFS/ Subaru

Oliveira

Oliveira²,

Arruda

et al. 2014

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation

Self Cite

View full text Add to dashboard Cite

FOCCoS, "Fiber Optical Cable and Connector System" has the main function of capturing the direct light from the focal plane of Subaru Telescope using optical fibers, each one with a microlens in its tip, and conducting this light through a route containing connectors to a set of four spectrographs. The optical fiber cable is divided in 3 different segments called Cable A, Cable B and Cable C. Multi-fibers connectors assure precise connection among all optical fibers of the segments, providing flexibility fo r instrument changes. To assure strong and accurate connection, these sets are arranged inside two types of assemblies: the Tower Connector, for connection between Cable C and Cable B ; and the Gang Connector, for connection between Cable B and Cable A. Throughput tests were made to evaluate the efficiency of the connecti ons. A lifetime test connection is in progress. Cable C is installed inside the PFI, Prime Focus Instrument, where each fiber tip with a microlens is bonded to the end of the shaft of a 2-stage piezo-electric rotatory motor positioner; this assembly allows each fiber to be placed anywhere within its patrol region, which is 9.5mm diameter. . Each positioner uses a fiber arm to support the ferrule, the microlens , and the optical fiber. 2400 of these assemblies are arranged on a motor bench plate in a hexagonal-closed-packed disposition. All optical fibers from Cable C, protected by tubes, pass through the motors' bench plate, three modular plates and a strain relief box, terminating at the Tower Connector. Cable B is permanently installed at Subaru Telescope structure, as a link between Cable C and Cable A. This cable B starts at the Tower Connector device, placed on a lateral structure of the telescope, and terminates at the Gang Connector device. Cable B will be routed to minimize the compression, torsion and bending caused by the cable weight and telescope motion. In the spectrograph room, Cable A starts at the Gang Connector, crosses a distribution box and terminates in a slit device. Each slit device receives approximately 600 optical fibers, linearly arrayed in a curve for better orientation of the light to the spectrograph collimator mirror. Four sets of Gang Connectors, distribution boxes and Slit devices complete one Cable A. This paper will review the general design of the FOCCoS subsystem, methods used to manufacture the involved devices, and the needed tests results to evaluate the total efficiency of the set.

show abstract

“…A microlens is attached at each fiber entrance for F-ratio transformation into a larger one, 2.8, so that difficulties of spectrograph design are eased. In FMOS, a near-infrared multi-fiber spectrograph on Subaru, a bright F-ratio of 2 is transformed into 5 in large fiber connectors 1 . Fibers are accurately placed onto target positions by two-staged piezo-electric rotary motors through iterations by a wide-field metrology camera.…”

Section: Introductionmentioning

confidence: 99%

Prime focus spectrograph: Subaru's future

et al. 2012

Self Cite

View full text Add to dashboard Cite

The Prime Focus Spectrograph (PFS) of the Subaru Measurement of Images and Redshifts (SuMIRe) project has been endorsed by Japanese community as one of the main future instruments of the Subaru 8.2-meter telescope at Mauna Kea, Hawaii. This optical/near-infrared multi-fiber spectrograph targets cosmology with galaxy surveys, Galactic archaeology, and studies of galaxy/AGN evolution.Taking advantage of Subaru's wide field of view, which is further extended with the recently completed Wide Field Corrector, PFS will enable us to carry out multi-fiber spectroscopy of 2400 targets within 1.3 degree diameter. A microlens is attached at each fiber entrance for F-ratio transformation into a larger one so that difficulties of spectrograph * hajime.sugai@ipmu.jp; phone 81 4 7136-6551; fax 81 4 7136-6576;

show abstract

Design and construction of the fibre system for FMOS

Cited by 7 publications

References 4 publications

Design and production of the DESI fibre cables

Design and production of the DESI fibre cables

Fiber optical cable and connector system (FOCCoS) for PFS/ Subaru

Prime focus spectrograph: Subaru's future

Contact Info

Product

Resources

About