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检索条件"任意字段=Optomechanical Design and Engineering 2001 Conference"

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Construction and calibration of a new design of Fiber Optic Respiratory Plethysmograph (FORP)

Construction and calibration of a new design of Fiber Optic ...

引用

optomechanical design and engineering 2001 conference

作者： Maletras, FX Augousti, AT Mason, J Kingston Univ Sch Life Sci Kingston upon Thames KT1 2EE Surrey England

ISBN: (纸本)0819441589

The Fiber Optic Respiratory Plethysmograph (FORP) is a non-invasive instrument for respiratory and heart monitoring in humans, based on the design of the Respiratory Inductive Plethysmograph (RIP). The FORP uses two sensors at thoracic and abdominal levels that measure circumferences rather than the cross sectional areas measured by the RIP. Each sensor is made of a specifically looped optical fiber that responds to elongation with variation in light transmission, via the macrobending loss effect. The design and construction of the original version of the FORP has been reported previously (1). This paper presents the results of a new figure-of-eight construction for the fiber loops. The resulting system shows greater signal range, increased linearity and less hysteresis than former constructions. Results are presented detailing the calibration of the respiratory measurements against a spirometer using a range of calibration protocols, one based on isovolume breathing and others on a Least Mean Square (LMS) fit. Additional improvements to signal processing and the increased sensitivity of the new design now make it practicable to detect torso motion arising from cardiac activity. This paper also presents results showing the simultaneous monitoring of respiratory and cardiac signals, using only the FORP transducers.

关键词： non-invasive instrumentation ventilatory volume heart rate multimode optical fiber macro-bending loss

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A design flow for MOEMS

A design flow for MOEMS

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conference on optomechanical engineering 2000

作者： Morris, A Bart, S Kane, D Lorenz, G Rabinovich, V Microcosm Technol Inc Cary NC 27606 USA

ISBN: (纸本)0819438634

As MOEMS transition from laboratory curiosities to production products inserted into telecommunication systems, a complete design flow is necessary for rapid product development to minimize time-to-market. We present a MOEMS design now that provides efficient top-down design and accurate bottom-up verification. The detailed MOEMS device design is addressed along with an integrated capability for including other optical elements, packaging, opto-electronics, as well as drive and control electronics.

关键词： MEMS MOEMS optomechanics free-space optics gaussian bean propagation system-level simulation parametric models

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design comparison of glass and beryllium AMSD mirrors

Design comparison of glass and beryllium AMSD mirrors

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conference on optomechanical engineering 2000

作者： Hardman, GB Heydenburg, TJ Rockwell, RA Raytheon Co Danbury CT 06810 USA

ISBN: (纸本)0819438634

The ongoing progress of shape-controlled mirrors for enabling lower mass, large segmented mirrors is described in the context of Raytheon's AMSD Program. This approach has been successfully applied in the past for room temperature telescopes as large as it-meters in aperture (at 70 kg/m(2)) and for cryogenic mirrors as large as 3-meters in aperture (at 30 kg/m(2)). The AMSD Program is producing similar mirror segments at 15 kg/m(2) while simultaneously investigating advanced manufacturing techniques with the potential for significant reductions in cost and schedule for multiple segments of a large aperture.

关键词： Mirrors Actuators Beryllium Space telescopes Cryogenics Glasses Telescopes Composites Manufacturing Segmented mirrors

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The effects of aberrations (low order and quilting) on the performance of the all-composite design for the Herschel Space Observatory

The effects of aberrations (low order and quilting) on the p...

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optomechanical design and engineering 2001 conference

作者： Catanzaro, B Thomas, JA Backovsky, S Barber, D Small, D Johnston, R Cohen, E CFE Serv San Diego CA 92109 USA

ISBN: (纸本)0819441589

The effects of specific aberrations on the optical performance of the all-composite design for the Herschel Space Observatory are examined. A review of the all-composite design for the large aperture (3.5 m) telescope that satisfies the target specifications is presented. Cyrogenic experiments with a carbon fiber reinforced polymer (CFRP) 2 in demonstration mirror have yielded empirical bounds on the high- and low-order spatial frequency aberrations that will be anticipated in the full 3.5 in Ritchey-Chretien telescope design. Detailed analysis is presented on the effect of the low order aberrations of the primary mirror on the system wavefront error and encircled energy. Predictable limits of correction via low order shaping of the secondary mirror are described. The impact of higher order surface errors on the encircled energy and the stray light will also be presented. Comments are made regarding the impact of the optical prescription and CRFP design on flight telescope testing.

关键词： carbon fiber composite space telescope PSF quilting cryogenic telescope far infrared low spatial frequency errors high spatial frequency errors encircled energy

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Athermal design and analysis for WDM applications

Athermal design and analysis for WDM applications

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optomechanical design and engineering 2001 conference

作者： Doyle, KB Hoffman, JM Opt Res Associates Westborough MA USA

ISBN: (纸本)0819441589

Telecommunication wavelength division multiplexing systems (WDM) demand high fiber-to-fiber coupling to minimize signal loss and maximize performance. WDM systems, with increasing data rates and narrow channel spacing, must maintain performance over the designated wavelength band and across a wide temperature range. Traditional athermal optical design techniques are coupled with detailed thermo-elastic analyses to develop an athermal optical system under thermal soak conditions for a WDM demultiplexer. The demultiplexer uses a pair of doublets and a reflective Littrow-mounted grating employed in a double-pass configuration to separate nine channels of data from one input fiber into nine output fibers operating over the C-band (1530 to 1561.6 nm). The optical system is achromatized and athermalized over a 0degreesC to 70degreesC temperature range. Detailed thermo-elastic analyses are performed via a MSC/NASTRAN finite element model. Finite element derived rigid-body positional errors and optical surface deformations are included in the athermalization process. The effects of thermal gradients on system performance are also evaluated. A sensitivity analysis based on fiber coupling efficiency is performed for radial, axial, and lateral temperature gradients.

关键词： wavelength division multiplexing athermal optical design fiber coupling efficiency thermo-elastic analysis integrated modeling thermal gradients

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C/SiC high precision lightweight components for optomechanical applications

C/SiC high precision lightweight components for optomechanic...

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conference on optomechanical engineering 2000

作者： Müller, C Papenburg, U Goodman, WA Jacoby, M Ind Anlagen Betriebsgesellsch GmbH TRW D-85521 Ottobrunn Germany

ISBN: (纸本)0819438634

We contend that carbon fiber reinforced silicon carbide material (C/SiC), developed by lABG, represents the state-of-the-art for ultra-light weight, high precision optomechanical structures that must operate in adverse environments and over wide ranges of temperature. C/SiC employs conventional NC machining/milling equipment to rapidly fabricate near-net shape parts, providing substantial schedule, cost, and risk savings for high precision components. Unlike powder based SiC ceramics, C/SiC does not experience significant shrinkage during processing, nor does it suffer from incomplete densification. By modifying certain process steps, the thermal and mechanical properties of C/SiC are tunable in certain ranges. This paper focuses on recent advances in C/SiC technology and application of this technology to high precision lightweight applications such as meter-class optics and optical mounts. We also introduce a design for new, high precision mounts based upon standard optical grade C/SiC (formulation A-3) and a custom formulation of C/SiC (D-4) which was engineered for Schafer Corporation by IABG. The A-3 and D-4 formulations have a near-perfect CTE match with silicon, making them the ideal material to athermally support ultra-lightweight silicon optics that will operate in a cryogenic environment.

关键词： C/SiC lightweight components meter-class optics optical mounts athermal design non-outgoing

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design and test of semi-rigid beryllium mirrors for lightweighted space applications;SBMD cryogenic performance update and AMSD design approach

Design and test of semi-rigid beryllium mirrors for lightwei...

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conference on optomechanical engineering 2000

作者： Kendrick, SE Reed, T Streetman, S Byrd, D Hadaway, JB Ball Aerosp & Technol Corp Boulder CO 80306 USA

ISBN: (纸本)0819438634

Ball Aerospace is currently under contract to Marshall Space Flight Center (MSFC) in Huntsville, AL to design, build, and test a state-of-the-art lightweight beryllium mirror for cryogenic space applications, the Next Generation Space Telescope (NGST) Sub-scale Beryllium Mirror Demonstrator (SBMD). The mirror is manufactured from spherical powder beryllium and optimized for cryogenic use. This 0.53-meter diameter lightweight mirror (< 12 kg/m(2)) has been tested at MSFC at ambient and cryogenic temperatures down to 23K, cryofigured for optimal performance at 35K, and subsequently retested at cryogenic temperatures. In addition, Ball has a separate contract with MSFC for an Advanced Mirror System Demonstrator (AMSD) to fabricate and test an ultra-lightweight mirror system which extends the semi-rigid SBMD mirror design to a 1.4-meter point-to-point beryllium hexagon mirror, flexures, rigid body and radius of curvature actuators, and reaction structure. This paper will describe the SBMD mirror performance and its cryogenic testing and present an overview of the AMSD semi-rigid beryllium mirror.

关键词： lightweighted mirrors cryogenic beryllium NGST

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Thermal design of retro-reflective stray light fore-baffles for space-borne optical systems

Thermal design of retro-reflective stray light fore-baffles ...

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conference on optomechanical engineering 2000

作者： Schneider, E Topsfield Engn Serv Inc Hingham MA 02043 USA

ISBN: (纸本)0819438634

The use of stray Light fore-baffles in spaceborne optical systems solves the problem of protecting the optical system from unwanted radiation(1-3). However, this introduces the problem of adding a large area black cavity at the system entrance aperture, and this cavity will run hot due to capture of solar, planetary albedo, and planetary emission radiation. The optical system may need to be baffled by a cool shield to keep system absolute temperatures sufficiently low. Alternately, a reflecting baffle system can be used that retro-reflects the input environment radiation. This reduces absorbed heat loads by the baffle system and reduces system absolute temperature levels. Some implementations of retro-reflective baffles involve ellipsoidal rings and others use different reflective surfaces such as in Linlor, bielliptical, or Lockhead-Stavroudis baffles(4-6,13-18.) There are other implementations which use coatings of small spherical beads or cube corners. This paper explicitly defines the trigonometry for an offset ellipsoidal ring-set which gives the theoretical geometric design for perfect retro-reflection ignoring skew rays. A model is then defined for baffle system evaluation which uses conservation of energy as a key parameter, and calculations for n unevenly spaced rings are derived, along with a method of subdividing each ring into a set of axisymmetric cones. Parametric calculations are performed which vary the subdivision from a single cone, to many cones, an approximated ellipsoid. Developed code is used to calculate geometry data sets for modeling baffle geometry, and commercially available thermal analysis software(7,8) is used to assess environmental heating. Two specific cases ate considered: (a) Solar inputs are generated for a near-Earth orbit Zenith look at sub Solar point, Earth oriented system, and (b) planet albedo and emission inputs are generated for a near-Earth orbit nadir looking at sub Solar point, Sun oriented system. design data are prese

关键词： stray light retro-reflecting baffle thermal design space-borne optical systems

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design and implementation of LED daylight lamp lighting system

Design and implementation of LED daylight lamp lighting syst...

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2008 International conference on Electronic Packaging Technology and High Density Packaging, ICEPT-HDP 2008

作者： Rongfeng, Guan Dalei, Tian Xing, Wang Institute of Materials Science and Engineering Henan Polytechnic University No. 2001 Century Avenue Jiaozuo City Henan Province China

ISBN: (纸本)9781424427406

LEDs have becoming the most suitable candidate replacing traditional fluorescent lamps because of its energy-efficient, the introduction of high brightness LEDs with white light and monochromatic colors have led to a movement towards general illumination. This revolutionizes the optoelectronics market, enabling engineers to use LEDs for general lighting applications as well as medical, indoor lighting and automotive solutions. So variable LED array modules were developed, they are making great strides in terms of lumen performance and reliability, however the barrier to widespread use in general illumination still remains the cost or luminous efficiency, special requirements concerning optical properties and optomechanical layout have to be met. In order to meet the requirements of indoor illumination, a LED daylight lamp model was designed, it can replace traditional fluorescent lamp without insteading additional power supply establishment. The optical properties of the model were simulated using optical analysis software, its luminous efficiency is about 41 lm/W, the illuminance is about 50 lux when the distance is 1.5 m between the center of the model and measured spot, With the theoreticallyoptimized design of the LED model, experiments based on the results of the optimal simulation in the laboratory were conducted to verify the performance of the proposed LED model, it reaches a power factor of about 0.8 at 11 W. Results of the simulation are very similar with the measured values, it was testified that simulative method is one of the effective tools for LED lighting optical design. © 2008 IEEE.

关键词： Light emitting diodes

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