1. FRED
Optimization
FRED: A software tool
for modern engineering

2. What is FRED? FRED Overview
Comprehensive opto-mechanical systems design analysis tool
Stray light analysis (scatter and ghosting)
Coherent beam propagation
Imaging system design and photo-realistic rendering
Virtual prototyping
Opto-mechanical systems debugging (Forensic Optics)
Thermal self-emission analysis
Illumination design
Tolerancing, fabrication and testing
Both sequential and non-sequential raytracing modes
Multi-variable optimization capability

3. What is FRED? FRED Overview FRED
FRED can be used in virtually every step of the design process.
Initial proof of concept using catalog parts
Integration of optical and CAD designs
Full analysis of a virtual prototype including scatter, coatings, dispersion, absorption, volume scatter, diffraction, thermal emission, source characteristics…
Quickly manipulate model parameters for tolerance analyses
Integration with vendor catalogs for manufacturing or system debugging
Concept 1
FRED
Design 2
Analysis 3 4
Tolerancing 5
Manufacture

4. FRED Optimization Applications What is optimization used for?
Positioning geometry
Controlling geometry size
Modifying surface shapes
Detector power transfer efficiency
Field distribution, shape and size
Pattern structure variation
Color image analysis
User-defined merit functions and variables

5. FRED Optimization Method What kind of optimization?
Non-sequential optimization is fundamentally different from the methods used in sequential software design
FRED uses both 1-D and multi-variable Simplex optimization
Robust method despite stochastic noise
Default and user-definable merit functions and variables
Constrained variable ranges or fractional parameterization
Limited only by computing hardware
Multiple restarts (Pseudo-Global)
Simulated Annealing (Pseudo-Global)

6. FRED Optimization Variables Default Variables Custom Variables
What variables are available?
Any entity property in the model can be a variable
Default Variables
Custom Variables
Position/Orientation parameters
Curvature
NURB control point X,Y,Z coordinates
NURB control point weights
Conic constant
Aspheric coefficients
Lens bending
Lens power
Lens thickness
Element volume boundary
User-defined BASIC script
Scripting commands give access to every parameter and function available in the GUI

7. FRED Optimization Metrics What metrics are available? Custom Metrics
Default Metrics
Project specific requirements may necessitate user-defined custom metrics be used.
RMS spot size
Encircled spot radius
Maximum power on surface
Minimum power on surface
Uniformity
Centroid position
Distribution fit to data

8. FRED Optimization Example Optimize an LED Distribution
Use FRED to optimize an LED collimating lens for a uniform illuminance distribution by varying the lens surfaces.

9. FRED Optimization Example Optimize an LED Distribution
User-defined metric driven to a minimum by the simplex
Metric needs to account for both power and uniformity
Metric = SD/Power
Scripted metric is… BASIC
Calculate Illuminance
Calculate SD
Calculate Power Transfer
Return Metric Value

10. FRED Optimization Example Optimize an LED Distribution 55 LUX (lm/m )2
88.5 LUX (lm/m ) 2

11. FRED Optimization Summary
Optimization can be used at any point in the engineering process, from simple positioning to complex analyses
Built in variables and metrics cover a wide range of applications, with an ever expanding catalog of default options
Allowing custom variables and metrics makes FRED’s optimization the most generic and flexible on the market
Having optimization capability in your toolbox saves valuable engineering time and money