tracepro evaluation
TRANSCRIPT
16/11/2010 1
TracePro Evaluation“TracePro, renowned in the scientific community for the accuracy of its simulations, offers lighting designers the confidence that the performance and aesthetics of finished products will concur with the simulated design without costly prototype iterations.”
Lambda Research Corporation specialise in software
tools for optics and illumination designers – TracePro
is one of their offerings
Is there a use for TracePro within F&P?
When a reflector is not quite what it should be
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Potential usage within PD
Lighting and optical design areas for appliances
– Light sources
– Light pipes– Reflectors
– Diffusers
– Materials
Specifics • Cavity lighting
– Oven/Fridge/Drawer• Optimisation of load
illumination
• Optimisation of light source requirements
• Minimization of shadows and silhouettes
• Elimination of glare
• Elimination of costly prototyping iterations
• User interfaces– Bezels/masks/point
illumination• Optimisation of hot
spots, colour mixing, spill, shielding, source selection
OB90 simulation of single cavity light
Mixing of RGB LED light sourcesWhite result starting to appear – limited in this simulation by numbers of rays traced
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Touch switch bezel
• System modelling
– Direct import of ProE
bezel model
– Applied material
properties to bezel
(Polycarb)
– Applied diffusion
properties to exit surfaces
– Insert a target
absorption surface for
exit ray capture
– Model cap button insert
– Model sheet surface
surround for bezel
– Model LED source
• Wavelengths
• Exit surfaces
• Rays to simulate
Target surfaces in purple
Two LED sources for comparison
Auxiliary LED source – rays simulated that reach target surfaces 4395
Projected image on external surface. Pipe efficiency with Primary LED source ~3%
Projected image on external surface. Pipe efficiency with Aux LED source ~25%
Actual Bezel in operation – notice the hot-spots and dark ring
Primary LED source – rays simulated that reach target surfaces 664
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Tack switch bezel
• System modelling involves very similar process
• Once the system is modelled variations to the bezel model can be rapidly analyzed until an optimum solution is realised
• Each halo illustrated is a projection from the exit surfaces of the bezel to a target screen 1mm away
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GOEP light pipe
• OB90 function and temperature control lighting bezel model
• LED models available within the TraceProenvironment
• Pipe simulated
– Efficiency ~60%
• Illustrations represent only 25k simulated rays
– Shows a uniform distribution about the
target bezel surface
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Orientation of a bulb
• Does the orientation of a halogen bulb effect the illumination efficiency of a target?
• Dummy target modelled as a perfect absorber to avoid unwanted reflection
• Housing unit modelled with ANOFOL material surface – close approximation to aluminised steel
• Change in bulb orientation improves efficiency by 73%
– Capable of further increased efficiency by changing perpendicular alignment of filaments
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Reflector material
• TracePro contains a library of surface materials that can be applied
• Simple system created to demonstrate affect on efficiency with various materials
– The model is based on a
possible configuration of
a lighting unit for an oven cavity
– Only one bulb position
simulated
– Efficiency measured by
rays captured at a target surface as a percentage
of total rays simulated
38% 44% 56% 83%
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OB2 cavity lighting • Goal
– Locate the optimum bulb
locations to effectively
illuminate a central cavity load as viewed
from an external screen
– Simulations only capture
rays that are direct reflections from the
cavity load
– Internal walls of cavity
are modelled as perfect
absorbers
– From previous known
cavity studies 9 target
bulb positions have been simulated
– Positions 3, 4, 5, and 6
give a worst case
efficiency improvement of 35%
Current acceptable position as in OB90 Bulb position 1 to 4 gives 93% efficiency improvement
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OB2 cavity lighting• Goal
– Using previous results:• Bulb orientation
• Reflector material
• Bulb locations
– Meet lighting CI’s including illumination of multiple cavity
loads
– System modelling completed as in all previous exercises
– To achieve the optimum light housing position along the Z axis
the loads have been moved in successive simulations to
determine the point of maximum
efficiency
– Assuming the cavity load would
be central on the Z and X planes the lighting units optimal location
is 40mm forward of centre
– An OB90 style lighting system would provide zero illumination
of the lower shelf load in a dual load configuration
Bulb and housing
vertical positioning
selected to ensure
acceptable
illumination of worst
case dual loads
within cavity
Trays have been
modelled as perfect
absorbers
Loads are reflectors
Cavity walls
absorbers
Captured rays are
only those reflected
from loads