A5037906786- Adaptive optics and wavefront sensing
- Astronomy and Astrophysical Research
- Optical Systems and Laser Technology
- Stellar, planetary, and galactic studies
- Acoustic Wave Phenomena Research
- Advanced X-ray Imaging Techniques
- Aerodynamics and Acoustics in Jet Flows
- Brake Systems and Friction Analysis
- Fusion materials and technologies
- Surface Roughness and Optical Measurements
- Astronomical Observations and Instrumentation
- Bladed Disk Vibration Dynamics
- Laser Design and Applications
- Metamaterials and Metasurfaces Applications
- Wind and Air Flow Studies
- Adhesion, Friction, and Surface Interactions
- Solid State Laser Technologies
- Noise Effects and Management
- Gamma-ray bursts and supernovae
- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Rheology and Fluid Dynamics Studies
- Vehicle Noise and Vibration Control
- Laser-Plasma Interactions and Diagnostics
- Augmented Reality Applications
Northrop Grumman (United States)
2006-2023
Trinity College Dublin
2019-2021
University of Cambridge
2015
UNSW Sydney
1996
TRW Automotive (United States)
1989-1993
Technical Solutions (United States)
1989
Abstract The James Webb Space Telescope (JWST) is a large, infrared space telescope that has recently started its science program which will enable breakthroughs in astrophysics and planetary science. Notably, JWST provide the very first observations of earliest luminous objects universe start new era exoplanet atmospheric characterization. This transformative enabled by 6.6 m passively cooled with 5 layer sunshield. primary mirror comprised 18 controllable, low areal density hexagonal...
Structural vibration controlled by interfacial friction is widespread, ranging from dampers in gas turbines to the motion of violin strings. To predict, control or prevent such vibration, a constitutive description frictional interactions inevitably required. A variety models are discussed assess their scope and validity, light constraints provided different experimental observations. Three contrasting case studies used illustrate how predicted behaviour can be extremely sensitive choice...
Abstract The attenuation of low-frequency broadband noise in a light, small form-factor is an intractable challenge. In this paper, new technology presented which employs the highly efficient visco-thermal loss mechanism micro-perforated plate (MPP) and successfully lowers its frequency response by combining it with decorated membrane resonators (DMR). Absorption comes from membranes but primarily MPP, as motion two causes pressure differential across MPP creating airflow through...
Equivalent circuit analysis is a powerful tool for analysing acoustic systems where lumped element model valid. These equivalent circuits allow an overall impedance of the structure to be estimated which facilitates predictions reflectivity, transmissibility and/or absorptivity system. Complex are represented by non-planar challenging simplify single value using traditional Kirchoff's Law simplifications. A two-point method graph theory allows without simplification. The applied type...
The context, preparation, and facilitization of Tinsley to produce the 18 JWST primary mirror segments are described, an overview Project at is presented. aggressively lightweighted, approximately hexagonal, 1.32m flat-to-flat. While optical finishing approach strongly seated in Tinsley's Computer Controlled Optical Surfacing (CCOS<sup>TM</sup>) technology, extensions have been implemented address safe efficient nearly simultaneous flow high value through numerous cycles finishing,...
James Webb Space Telescope (JWST) Optical Element (OTE) mirror coating program has been completed. The science goals of the JWST mission require a uniform, low stress, durable optical with high reflectivity over spectral region. to be environmentally stable, radiation resistant and compatible cryogenic operating environment. large size, 1.52 m point point, light weight, beryllium primary (PM) segments flawless process during flight that consisted 21 mirrors were among many technical...
The James Webb Space Telescope (JWST) is a large, infrared space telescope that has recently started its science program which will enable breakthroughs in astrophysics and planetary science. Notably, JWST provide the very first observations of earliest luminous objects Universe start new era exoplanet atmospheric characterization. This transformative enabled by 6.6 m passively cooled with 5-layer sunshield. primary mirror comprised 18 controllable, low areal density hexagonal segments, were...
The James Webb Space Telescope (JWST) is a 6.5m, segmented, IR telescope that will explore the first light of universe after big bang. In 2014, major risk reduction effort related to Alignment, Integration, and Test (AI T) segmented was completed. Pathfinder includes two Primary Mirror Segment Assemblies (PMSA's) Secondary Assembly (SMA) onto flight-like composite backplane. This pathfinder allowed JWST team assess alignment process better understand various error sources need be...
During 2009, Tinsley finished most of the Configuration 1 pre-cryo test Computer Controlled Optical Surfacing (CCOS) operations on James Webb Space Telescope primary mirror segments and in mid-2009 we began 2 post-cryo CCOS operations. After completing grinding polishing operations, including final figuring to a cryo-null target, delivered Engineering Development Unit (EDU) Ball Aerospace Technology Corporation 4 December 2009. Achieving fabrication metrology conditions meet specifications...
Recent investigations have demonstrated the applicability of dichromated gelatin holograms to a number optical communication, sensor and solar energy applications. This has prompted interest in using these elements space based systems. In order establish suitability DCG systems an investigation was undertaken determine effects simulated environments on performance elements. Testing conducted UV radiation, charged particle radiation vacuum effects. Further testing established methods...
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text G. C. Cole, R. Garfield, T. Peters, W. Wolff, Bernier, Kiikka, Nassar, J. Kincade, Hull, B. Gallagher, Brown, A. McKay, and L. M. Cohen, "Optical Fabrication of the James Webb Space Telescope Primary Mirror," in Frontiers Optics, OSA Technical Digest (CD) (Optica Publishing Group, 2006), paper OFMA2. Export BibTex Endnote (RIS) HTML Plain alert Save article
A diffractive optical element has been fabricated using VLSI techniques for use in multi-channel infra-red systems. This micro-optic demonstrates the flexibility and resolution available with current lithographic techniques. The a diffraction efficiency of 47% noise floor -30dB. As continue to improve, optics will become systems operating throughout visible spectrum.
Flat transmissive material windows are often used in high power cw laser systems to separate a low pressure resonator cavity from one atmosphere beam train. Recently requirement was identified for cell window that would transmit intensity peaks of 31 KW/cm<SUP>2</SUP> 5 seconds, react differential 52 atm without active cooling, and focus the incident light as lens. Budgeted optical distortion levels were 400 nm rms wave front error no more than 0.01% conversion s polarization state into p...