Design of the cryogenic wheel mechanisms for IRCS and NIRI

James Bell, Jeffrey W. Douglass, Klaus Werner Hodapp, Naoto Kobayashi, Louis Robertson, Alan T. Tokunaga, Tony T. Young

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

The IR camera and spectrograph (IRCS) for SUBARU and Gemini near-IR imager (NIRI) instruments have a common design for all wheels, based on a modified geneva mechanisms with a locking cam actuated detent pin. The geneva design, in combination with the spring loaded detent mechanism, allows the stepper motor/spur gear drive to decouple from the wheel at each aperture position. The detent mechanism positions the wheel precisely. The need for precise motor control and wheel position encoding is reduced because of the detent mechanism. Six of these mechanism are filters wheels requiring repeatable aperture positing. The other seven mechanisms include of a slit wheel, grism wheel, pupil mask wheel, 2 beam steerers, a focal p;lane mask wheel, and a beamsplitter wheel. These mechanisms require repeatable, stable and accurate positioning. The number of aperture positions for the 13 wheels range from 2 to 16. The mechanisms are aligned and tested at room temperature and operated at 60 K, requiring an athermal design, for which the modified geneva mechanism is ideally suited. This paper will discuss the prototype development and final mechanical design of specific wheel mechanisms completed for the IRCS and NIRI instruments at the Institute for Astronomy.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Pages1103-1110
Number of pages8
Volume3354
DOIs
StatePublished - 1998
Externally publishedYes
EventInfrared Astronomical Instrumentation - Kona, HI, United States
Duration: Mar 23 1998Mar 23 1998

Other

OtherInfrared Astronomical Instrumentation
CountryUnited States
CityKona, HI
Period3/23/983/23/98

Fingerprint

Spectrographs
Spectrograph
Imager
wheels
Image sensors
Wheel
Cryogenics
spectrographs
cryogenics
Wheels
Camera
Cameras
cameras
apertures
Mask
Design
Masks
masks
Design for All
Spur gears

Keywords

  • Beam steerer
  • Beamsplitter
  • Filter
  • Grism
  • Mask
  • Pupil mask
  • Slit
  • Wheel, mechanism

ASJC Scopus subject areas

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

Cite this

Bell, J., Douglass, J. W., Hodapp, K. W., Kobayashi, N., Robertson, L., Tokunaga, A. T., & Young, T. T. (1998). Design of the cryogenic wheel mechanisms for IRCS and NIRI. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 3354, pp. 1103-1110) https://doi.org/10.1117/12.317235

Design of the cryogenic wheel mechanisms for IRCS and NIRI. / Bell, James; Douglass, Jeffrey W.; Hodapp, Klaus Werner; Kobayashi, Naoto; Robertson, Louis; Tokunaga, Alan T.; Young, Tony T.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3354 1998. p. 1103-1110.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Bell, J, Douglass, JW, Hodapp, KW, Kobayashi, N, Robertson, L, Tokunaga, AT & Young, TT 1998, Design of the cryogenic wheel mechanisms for IRCS and NIRI. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 3354, pp. 1103-1110, Infrared Astronomical Instrumentation, Kona, HI, United States, 3/23/98. https://doi.org/10.1117/12.317235
Bell J, Douglass JW, Hodapp KW, Kobayashi N, Robertson L, Tokunaga AT et al. Design of the cryogenic wheel mechanisms for IRCS and NIRI. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3354. 1998. p. 1103-1110 https://doi.org/10.1117/12.317235
Bell, James ; Douglass, Jeffrey W. ; Hodapp, Klaus Werner ; Kobayashi, Naoto ; Robertson, Louis ; Tokunaga, Alan T. ; Young, Tony T. / Design of the cryogenic wheel mechanisms for IRCS and NIRI. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3354 1998. pp. 1103-1110
@inproceedings{ee8c37fa74ac44e38f3734db7512d611,
title = "Design of the cryogenic wheel mechanisms for IRCS and NIRI",
abstract = "The IR camera and spectrograph (IRCS) for SUBARU and Gemini near-IR imager (NIRI) instruments have a common design for all wheels, based on a modified geneva mechanisms with a locking cam actuated detent pin. The geneva design, in combination with the spring loaded detent mechanism, allows the stepper motor/spur gear drive to decouple from the wheel at each aperture position. The detent mechanism positions the wheel precisely. The need for precise motor control and wheel position encoding is reduced because of the detent mechanism. Six of these mechanism are filters wheels requiring repeatable aperture positing. The other seven mechanisms include of a slit wheel, grism wheel, pupil mask wheel, 2 beam steerers, a focal p;lane mask wheel, and a beamsplitter wheel. These mechanisms require repeatable, stable and accurate positioning. The number of aperture positions for the 13 wheels range from 2 to 16. The mechanisms are aligned and tested at room temperature and operated at 60 K, requiring an athermal design, for which the modified geneva mechanism is ideally suited. This paper will discuss the prototype development and final mechanical design of specific wheel mechanisms completed for the IRCS and NIRI instruments at the Institute for Astronomy.",
keywords = "Beam steerer, Beamsplitter, Filter, Grism, Mask, Pupil mask, Slit, Wheel, mechanism",
author = "James Bell and Douglass, {Jeffrey W.} and Hodapp, {Klaus Werner} and Naoto Kobayashi and Louis Robertson and Tokunaga, {Alan T.} and Young, {Tony T.}",
year = "1998",
doi = "10.1117/12.317235",
language = "English (US)",
volume = "3354",
pages = "1103--1110",
booktitle = "Proceedings of SPIE - The International Society for Optical Engineering",

}

TY - GEN

T1 - Design of the cryogenic wheel mechanisms for IRCS and NIRI

AU - Bell, James

AU - Douglass, Jeffrey W.

AU - Hodapp, Klaus Werner

AU - Kobayashi, Naoto

AU - Robertson, Louis

AU - Tokunaga, Alan T.

AU - Young, Tony T.

PY - 1998

Y1 - 1998

N2 - The IR camera and spectrograph (IRCS) for SUBARU and Gemini near-IR imager (NIRI) instruments have a common design for all wheels, based on a modified geneva mechanisms with a locking cam actuated detent pin. The geneva design, in combination with the spring loaded detent mechanism, allows the stepper motor/spur gear drive to decouple from the wheel at each aperture position. The detent mechanism positions the wheel precisely. The need for precise motor control and wheel position encoding is reduced because of the detent mechanism. Six of these mechanism are filters wheels requiring repeatable aperture positing. The other seven mechanisms include of a slit wheel, grism wheel, pupil mask wheel, 2 beam steerers, a focal p;lane mask wheel, and a beamsplitter wheel. These mechanisms require repeatable, stable and accurate positioning. The number of aperture positions for the 13 wheels range from 2 to 16. The mechanisms are aligned and tested at room temperature and operated at 60 K, requiring an athermal design, for which the modified geneva mechanism is ideally suited. This paper will discuss the prototype development and final mechanical design of specific wheel mechanisms completed for the IRCS and NIRI instruments at the Institute for Astronomy.

AB - The IR camera and spectrograph (IRCS) for SUBARU and Gemini near-IR imager (NIRI) instruments have a common design for all wheels, based on a modified geneva mechanisms with a locking cam actuated detent pin. The geneva design, in combination with the spring loaded detent mechanism, allows the stepper motor/spur gear drive to decouple from the wheel at each aperture position. The detent mechanism positions the wheel precisely. The need for precise motor control and wheel position encoding is reduced because of the detent mechanism. Six of these mechanism are filters wheels requiring repeatable aperture positing. The other seven mechanisms include of a slit wheel, grism wheel, pupil mask wheel, 2 beam steerers, a focal p;lane mask wheel, and a beamsplitter wheel. These mechanisms require repeatable, stable and accurate positioning. The number of aperture positions for the 13 wheels range from 2 to 16. The mechanisms are aligned and tested at room temperature and operated at 60 K, requiring an athermal design, for which the modified geneva mechanism is ideally suited. This paper will discuss the prototype development and final mechanical design of specific wheel mechanisms completed for the IRCS and NIRI instruments at the Institute for Astronomy.

KW - Beam steerer

KW - Beamsplitter

KW - Filter

KW - Grism

KW - Mask

KW - Pupil mask

KW - Slit

KW - Wheel, mechanism

UR - http://www.scopus.com/inward/record.url?scp=0346753068&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0346753068&partnerID=8YFLogxK

U2 - 10.1117/12.317235

DO - 10.1117/12.317235

M3 - Conference contribution

VL - 3354

SP - 1103

EP - 1110

BT - Proceedings of SPIE - The International Society for Optical Engineering

ER -