Verification of the James Webb Space Telescope Integrated Science Instrument Module cryogenic structural alignment requirements via photogrammetry

Nowak, Maria; Cleveland, Paul; Crane, Allen; Davila, Pamela S.; Herrera, Acey; Hylan, Jason E.; Liehr, Andrew D.; Marsh, J. G.; Ohl, Raymond G.; Redman, Kevin; Sampler, Henry P.; Stock, Joseph M.; Wenzel, Greg; Woodruff, Robert A.; Young, Philip J.

doi:10.1117/12.798791

Cited by 6 publications

(5 citation statements)

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“…** They each have their advantages and disadvantages, as outlined elsewhere by Ohl et al (2009) [17]. Building on the work of Nowak et al (2007Nowak et al ( , 2008, pre-integration characterization of ISIM's PG system is complete. Recent ISIM mock-up testing included a "blind" survey, where PG targets were perturbed various distances on the structure and the system measured the resulting change.…”

Section: Ambient Metrologymentioning

confidence: 98%

“…The KMs are thus stressed in a manner different from the flight condition and the corresponding A-to-B alignment change with temperature is different as when ISIM is mounted to the flight BSF. The cryogenic performance of the ITP will be characterized using the photogrammetry system (PG) [10,11]. The structure and KMs, attached to the ITP, will be characterized using PG for both an unloaded and loaded structure (SI mass models).…”

Section: Alignment Plan Updatesmentioning

confidence: 99%

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Updates to the optical alignment and test plan for the James Webb Space Telescope integrated science instrument module

Ohl

2009

SPIE Proceedings

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NASA's James Webb Space Telescope (JWST) is a 6.6m diameter, segmented, deployable telescope for cryogenic IR space astronomy (~40K). The JWST Observatory architecture includes the Optical Telescope Element (OTE) and the Integrated Science Instrument Module (ISIM) element that contains four science instruments (SI) including a Guider. The SIs and Guider are mounted to a composite metering structure with outer dimensions of ~2.2x2.2x1.7m. The SI and Guider units are integrated to the ISIM structure and optically tested at NASA Goddard Space Flight Center as an instrument suite using a telescope simulator (Optical telescope element SIMulator; OSIM). OSIM is a high-fidelity, cryogenic JWST telescope simulator that features a ~1.5m diameter powered mirror. The SIs are aligned to the structure's coordinate system under ambient, clean room conditions using optomechanical metrology. OSIM is aligned to the ISIM mechanical coordinate system at the cryogenic operating temperature via internal mechanisms and feedback from alignment sensors in six degrees of freedom. SI performance, including focus, pupil shear, pupil roll, boresight, wavefront error, and image quality, is evaluated at the operating temperature using OSIM. This work updates the assembly and ambient and cryogenic optical alignment, test and verification plan for ISIM.

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Section: Ambient Metrologymentioning

confidence: 98%

Section: Alignment Plan Updatesmentioning

confidence: 99%

Updates to the optical alignment and test plan for the James Webb Space Telescope integrated science instrument module

Ohl

2009

SPIE Proceedings

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“…12 Photogrammetry (PG) is used for cryogenic metrology of the ITP and ISIM structure (Figure 25b). 13 Cryogenic characterization of the ITP was completed in early 2010. The ITP dimensional change from ambient to cryogenic temperatures is in good agreement with model expectations.…”

Section: Custom Javascript Language Extensionsmentioning

confidence: 99%

Status of the James Webb Space Telescope integrated science instrument module system

et al. 2011

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The Integrated Science Instrument Module (ISIM) of the James Webb Space Telescope (JWST) is discussed from a systems perspective with emphasis on development status and advanced technology aspects. The ISIM is one of three elements that comprise the JWST space vehicle and is the science instrument payload of the JWST. The major subsystems of this flight element and their build status are described.

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“…In addition, photogrammetry targets can be readily related to the targets used for ambient surveys of the structure. Although photogrammetry systems have long been used in similar measurement scenarios [9,10], techniques for high-precision deformation measurements in vacuum environments are not yet mature. The OMT of the CSST requires a deformation resolution of more than 10 µm in a vacuum environment, which poses a challenge in terms of both the photogrammetry systems and the measurement methods used.…”

Section: Introductionmentioning

confidence: 99%

Industrial photogrammetry for the optical mechanical truss of the China Survey Space Telescope

Shen¹,

Yue²,

Liu³

et al. 2023

Meas. Sci. Technol.

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The China Survey Space Telescope is the main observation stage of the Chinese space station, and is the most advanced and expensive observation equipment ever constructed in the Chinese astronomical community. The telescope is composed of multi-stage mirrors, whose relative positions determine the observation accuracy of the telescope, and an optical mechanical truss forms the mechanical structure that supports them. This paper presents a deformation measurement scheme for the optical mechanical truss, and introduces a process of deformation measurement and a data processing method for this optical mechanical truss using industrial photogrammetry technology. The repeatability and accuracy of the industrial photogrammetry system were tested under ambient conditions, and the length measurement data were compared and verified with interferometry measurements.

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Verification of the James Webb Space Telescope Integrated Science Instrument Module cryogenic structural alignment requirements via photogrammetry

Cited by 6 publications

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Updates to the optical alignment and test plan for the James Webb Space Telescope integrated science instrument module

Updates to the optical alignment and test plan for the James Webb Space Telescope integrated science instrument module

Status of the James Webb Space Telescope integrated science instrument module system

Industrial photogrammetry for the optical mechanical truss of the China Survey Space Telescope

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