David G. Bramall

Durham University

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J. Schmoll

Durham University

Paul Maropoulos

Queen's University Belfast

R. M. Sharples

Durham University

Claire Poppett

Lawrence Berkeley National Laboratory

K R McKay

Durham University

Cyril Bourgenot

Durham University

Jerry Edelstein

University of California, Berkeley

Luke Tyas

Lawrence Berkeley National Laboratory

Paul Clark

Durham University

Stephen Rolt

Durham University

Cooperative Institutions

Centre National de la Recherche Scientifique

Durham University

UK Astronomy Technology Centre

Lawrence Berkeley National Laboratory

Observatoire de Paris

University of California, Berkeley

Laboratoire d’Astrophysique de Marseille

Université Paris Cité

University of Oxford

Royal Observatory

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Steering mirror system with closed-loop feedback for free-space optical communication terminals

Christopher Graham David G. Bramall Othman Isam Younus Amna Riaz Richard Binns

Free-Space Optical Communication

Feedback loop

Free space

Feedback Control

10.1117/12.3028863

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An aggregate resource model for the provision of dynamic ‘resource-aware’ planning

Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture (2003)

Paul Maropoulos David G. Bramall K R McKay B. C. Rogers Peter Chapman

The realization of agile enterprises requires substantial development of the underpinning modelling, information management and knowledge representation technologies. This paper introduces a resource model that has been developed to support the dynamic, aggregate planning of manufacturing operations within large, complex production networks during the formative stages of design. The main goal of aggregate planning is the measurement of product manufacturability and the evaluation of alternative design configurations and manufacturing scenarios, through the allocation of multiple parts to remote facilities within the supply network. The term ‘resource aware’ planning is used to indicate the creation of a dynamic interrelationship between the planning entities (products and processes) and the enterprise resources, including humans and machines. The technologies employed for implementing the pilot methods include the aggregate resource modelling methodology, a web-centric co-development environment, unique methods for enriching planning entities with knowledge and evolutionary computing methods for the rapid generation and optimization of production routes. A pilot resource aware planning system has been implemented that supports many innovative modes of operation, the initial testing of which was very encouraging.

Aggregate planning

Underpinning

Agile Manufacturing

Manufacturing resource planning

10.1243/095440503322617234

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Citations (7)

VXMS: the VISTA extreme multiplex spectrograph

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2012)

Robert Content T. Shanks R. M. Sharples David G. Bramall Will J. Percival

A study for a spectrograph delivering at least 10000 slits for galaxies and 20000 for stars over a 2.5 deg² field have been completed as an answer to the call for proposal for future VISTA MOS instrumentation. In a single night, 65000 galaxy redshifts can be measured to z~0.7 and beyond for measuring the Baryon Acoustic Oscillation (BAO) scale and many other science goals. The design features ten cloned spectrographs which give a smaller total weight and length than a unique spectrograph to make it placable in the space envelope of the Cassegrain focus. The clones use a transparent design including a grism in which all optics are about the size or smaller than the clone rectangular subfield so that they can be tightly packed with little gaps between subfields. Only low cost glasses are used; the variations in chromatic aberrations between bands are compensated by changing a box containing the grism and two adjacent lenses. Two bands cover the 550nm to 900nm wavelength range at resolution of 1100 for blue end and 3000 for red end while another cover the Calcium triplet at 5000. An optional box does imaging but we studied different innovative methods for acquisition without imaging. A new 2.3° corrector was designed that places the pupil before and relatively near the focal plane which permits to give more space at the back of the spectrographs by placing them in a hedgehog configuration. An offaxis field lens in each spectrograph permits to control the pupil position.

Cassegrain reflector

Grism

Integral field spectrograph

Spectral resolution

Asteroseismology

10.1117/12.927260

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The SALT HRS spectrograph: instrument integration and laboratory test results

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2012)

David G. Bramall J. Schmoll Luke Tyas Paul Clark Eddy Younger

SALT HRS is a fibre-fed, high dispersion échelle spectrograph currently being constructed for the Southern African Large Telescope (SALT). In this paper we highlight the performance of key optical components, describe the integration tasks that have taken place and present some first light results from the laboratory. The instrument construction is well advanced and we report on the attainment of the required mechanical and thermal stability and provide a measurement of the input optics performance (including the fibre feed). The initial optical alignment of both the fibre input optics, including image slicers, and the spectrograph optics has taken place and is described.

10.1117/12.925935

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Citations (48)

Optical ground support equipment for the alignment of JWST-NIRSpec

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2008)

J. Schmoll Alastair Basden David G. Bramall Paul Clark Richard E. Cole

The alignment of the JWST NIRSpec spectrograph will use a customised set of optical light sources, imagers and wavefront sensors, which form part of the Optical Ground Support Equipment (OGSE). This has been developed by the Mullard Space Science Laboratory (MSSL) and the Centre for Advanced Instrumentation (CfAI) to be used at the Astrium GmbH, Ottobrunn (Germany) during NIRSpec integration. This paper describes the five precision illumination sources which form a key part of NIRSpec OGSE, and the optomechanical design of the three Shack-Hartmann wavefront sensors used.

Instrumentation

10.1117/12.789521

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MOSAIC at the ELT: a unique instrument for the largest ground-based telescope

R. Pelló M. Puech Éric Prieto M. Rodrigues Rubén Sánchez-Janssen

Mosaic

10.1117/12.3019047

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Citations (2)

A Novel Digital Enterprise Technology Framework for the Distributed Development and Validation of Complex Products

CIRP Annals (2003)

Paul Maropoulos B. C. Rogers Peter Chapman K R McKay David G. Bramall

Bridge (graph theory)

10.1016/s0007-8506(07)60608-8

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Citations (14)

Using discrete event simulation to increase competitiveness within a high volume press shop

Lucie Jane Custance David G. Bramall Paul Maropoulos

Discrete-Event Simulation

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Design and production of the DESI fibre cables

Ground-based and Airborne Instrumentation for Astronomy VII (2018)

J. Schmoll R. M. Sharples Luke Tyas David G. Bramall Claire Poppett

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.

10.1117/12.2312140

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Citations (5)

Exploiting digital enterprise technology in sustainable design and manufacture

David G. Bramall Paul Baguley Paul Maropoulos

There is a perceived dichotomy between the aim of increased product lifetimes and recyclability, promoted by sustainable development practitioners, and the reduced product lifecycle and cost-effective production methods demanded by the marketplace. To address these issues, this paper presents an assessment of the available digital enterprise technologies for the concurrent design of sustainable products and the associated manufacturing systems. Some of the tools and techniques which are available to increase the sustainability and manufacturability of products through innovative manufacturing methodologies are investigated.

Sustainable Production

Sustainable products

Sustainable Design

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Citations (1)