how to model light sources in tracepro - lambdares.com · how to model light sources in tracepro....
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How to Model Light Sources in TracePro
Presented by:Lambda Research Corporation
25 Porter Rd.Littleton, MA 01460www.lambdares.com
July 28, 2010
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Moderator:Andy KnightTechnical Sales Manager, Lambda Research Corporation
Presenter:Dave JacobsenSr. Application Engineer, Lambda Research Corporation
How to Model Light Sources in TracePro
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Format
•20-30 minute presentation followed by a 10-15 minute question and answer session
•Please submit questions using the Question box in the GoToWebinar control panel
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In this webinar you will:
•Learn about the light source modeling tools in TracePro, including Grid, File, Surface, and Bitmap Source
•Gain insight on how to choose the best method for modeling a given light source
•Learn how combinations of sources can be used to model complex light sources such as arc lamps or diffuse sky models
•See a comparison of modeled versus measured data for a light source
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In this webinar you will:
•Discover the helpful TracePro utilities for source modeling including the Surface Source Property Generator Utility, the IES Import Utility, and the Bitmap Source Utility
•Have your source modeling questions answered in the Questions and Answer session
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How to Model Light Sources in TracePro
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Question:
What types of light sources can you model in TracePro?
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Answer:
Pretty much anything.
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Examples•LEDs•OLEDs•Arc lamps•Filament lamps•Lasers•Fluorescent lamps•HID lamps•Sun•Sky•Fire•Fluorescence
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Types of Light Sources in TracePro
•Grid Sources
•File Sources
•Surface Sources
•Bitmap Sources
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Grid SourcesBest for:•Planar sources that have a well defined boundary•Sources that emit in a Lambertian or uniform manner•Monochromatic and polychromatic sources
Considerations:•Not the best option for a 3-dimensional source•May not be able to model more complex angular distributions
Examples:•Fiber optics•Laser diodes
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Grid Source - Laser Diode Example
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Grid Source - Laser Diode Example
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File SourcesBest for:•Planar and 3-dimensional sources•Sources that emit in complex angular distribution patterns•Sources that can be modeled monochromatically•Sources that have lenses and structural elements
Considerations:•Defined monochromatically•Not a good choice if emitted light will interact with source
Examples:•LEDs•Luminaires
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File Source – LED Example
Osram Golden Dragon Plus LED Monochromatic
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Example of File Source or Ray File Data
•Can be 1 million+ lines long•Monochromatic only
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Example of Emitted Light Interacting with Source
•Some of the light emitted by the LED is totally internally reflected by the lens
•Ray sorting feature in TracePro® is used to show rays that are hitting the LED’s lens dome
•Approximately 0.1% of initial flux is impinging back on the source
Small percentage of rays shown
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Surface SourcesBest for:•Detailed source models•Sources that emit in complex angular and spectral distribution patterns•Where modeling the interaction of light with the source structure is important
Considerations:•Models can be more complex to make•Need accurate material and surface properties
Examples:•LEDs•Lamps such as arc and filament•Complete optical systems
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Example of Surface Source Property Data
Emission can vary as a function of:•Temperature•Wavelength•Polar Angle•Azimuth Angle
Note:Units should be consistent.If spectrum is defined in radiometric units then emission should be as well.
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Surface Source – LED Example
TrueColor display possible because of
spectral distribution in Surface Source
Property
Osram Golden Dragon Plus LED
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Bitmap Sources
Best for:•Making TracePro File Sources from image file formats such as BMP, GIF, JPG, PNG, and MOV
Considerations:•Resulting File Sources can be very large
Examples:•Tracing images through systems in TracePro
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Bitmap Sources
Bitmap image and Bitmap Source Utility is used to create a File Source for TracePro
Object
Lens system in TracePro
Image
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4 Sources, 1 Model
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TIR Hybrid Lens with Point Source
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TIR Hybrid Lens with 1mm x 1mm Grid Source
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TIR Hybrid Lens with Ray File Source
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TIR Hybrid Lens with Surface Source Property
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Increasing the Complexity
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1500-watt Xenon Lamp with Surface Source Properties
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1500-watt Xenon Lamp with Surface Source Properties
Arc model showing luminous intensity distribution
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Modeling an Overcast Sky
A Spatially Varying Source
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Modeling an Overcast Sky
Luminance varies as a function of angle above horizon:
CIE DS 011.2/E:2002
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Modeling an Overcast Sky
to make a Surface Source Property in TracePro
Use:
Note that the zenith in TracePro is 0-degrees
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Modeling an Overcast Sky
•Use a hemisphere to represent the sky
•Apply the Surface Source Property to the surface of object at the center of the hemisphere
•Trace rays to the inside surface of the hemisphere
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Modeling an Overcast Sky•Get the Incident Ray Table for the inside surface of the hemisphere
•Use Save Incident Ray Data with “Export to Source File format” and “Reverse Source ray direction” options to create a new File Source from the Incident Ray Table data
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Modeling an Overcast Sky•Insert the new File Source in your model and run the raytrace
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Measured Data vs. Simulation Data: An Example
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PerkinElmer FX-1150 Short-arc Xenon Flashlamp Example
Photograph courtesy of PerkinElmer Optoelectronics, Salem, MA
TracePro model of FX-1150
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PerkinElmer FX-1150 Short-arc Xenon Flashlamp Example
TracePro model of FX-1150 arcImage of FX-1150 arc
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PerkinElmer FX-1150 Short-arc Xenon Flashlamp Example
Angular Distribution: Measured vs. Modeled
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PerkinElmer FX-1150 Short-arc Xenon Flashlamp Example
Spectral Distribution
Measured(0.7nm sampling interval)
Modeled(2nm sampling interval)
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TracePro Utilities for Light Source Modeling
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Surface Source Property Generator Utility
Luxeon Rebel LED
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IES Import Utility
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Bitmap Source Utility
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Thank You!
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Questions and Answers
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For Additional Information Please Contact:
Lambda Research CorporationLittleton, MA
978-486-0766www.lambdares.com