Illumination Engineering: Design with Nonimaging Optics

ISBN-13: 9780470911402 / Angielski / Twarda / 2013 / 328 str.

John Koshel

Opis

This book brings together experts in the field who present material on a number of important and growing topics including lighting, displays, solar concentrators. The first chapter provides an overview of the field of nonimagin and illumination optics. Included in this chapter are terminology, units, definitions, and descriptions of the optical components used in illumination systems. The next two chapters provide material within the theoretical domain, including etendue, etendue squeezing, and the skew invariant. The remaining chapters focus on growing applications.

This entire field of nonimaging optics is an evolving field, and the editor plans to update the technological progress every two to three years. The editor, John Koshel, is one of the most prominent leading experts in this field, and he is the right expert to perform the task.

Recenzje

Aside from illumination engineers, the book could be useful for graduate electrical or optical engineering students.   (Optics & Photonics News, 13 September 2013)

Spis treści

PREFACE xiii

CONTRIBUTORS xvii

GLOSSARY xix

CHAPTER 1 INTRODUCTION AND TERMINOLOGY 1

1.1 What Is Illumination? 1

1.2 A Brief History of Illumination Optics 2

1.3 Units 4

1.3.1 Radiometric Quantities 4

1.3.2 Photometric Quantities 6

1.4 Intensity 9

1.5 Illuminance and Irradiance 10

1.6 Luminance and Radiance 11

1.6.1 Lambertian 13

1.6.2 Isotropic 14

1.7 Important Factors in Illumination Design 15

1.7.1 Transfer Effi ciency 15

1.7.2 Uniformity of Illumination Distribution 16

1.8 Standard Optics Used in Illumination Engineering 17

1.8.1 Refractive Optics 18

1.8.2 Refl ective Optics 20

1.8.3 TIR Optics 22

1.8.4 Scattering Optics 24

1.8.5 Hybrid Optics 24

1.9 The Process of Illumination System Design 25

1.10 Is Illumination Engineering Hard? 28

1.11 Format for Succeeding Chapters 29

References 30

CHAPTER 2 ÉTENDUE 31

2.1 Étendue 32

2.2 Conservation of Étendue 33

2.2.1 Proof of Conservation of Radiance and Étendue 34

2.2.2 Proof of Conservation of Generalized Étendue 36

2.2.3 Conservation of Étendue from the Laws of Thermodynamics 40

2.3 Other Expressions for Étendue 41

2.3.1 Radiance, Luminance, and Brightness 41

2.3.2 Throughput 42

2.3.3 Extent 43

2.3.4 Lagrange Invariant 43

2.3.5 Abbe Sine Condition 43

2.3.6 Confi guration or Shape Factor 44

2.4 Design Examples Using Étendue 45

2.4.1 Lambertian, Spatially Uniform Disk Emitter 45

2.4.2 Isotropic, Spatially Uniform Disk Emitter 48

2.4.3 Isotropic, Spatially Nonuniform Disk Emitter 50

2.4.4 Tubular Emitter 52

2.5 Concentration Ratio 59

2.6 Rotational Skew Invariant 61

2.6.1 Proof of Skew Invariance 61

2.6.2 Refi ned Tubular Emitter Example 63

2.7 Étendue Discussion 67

References 68

CHAPTER 3 SQUEEZING THE ÉTENDUE 71

3.1 Introduction 71

3.2 Étendue Squeezers versus Étendue Rotators 71

3.2.1 Étendue Rotating Mappings 74

3.2.2 Étendue Squeezing Mappings 77

3.3 Introductory Example of Étendue Squeezer 79

3.3.1 Increasing the Number of Lenticular Elements 80

3.4 Canonical Étendue–Squeezing with Afocal Lenslet Arrays 82

3.4.1 Squeezing a Collimated Beam 82

3.4.2 Other Afocal Designs 83

3.4.3 Étendue–Squeezing Lenslet Arrays with Other Squeeze–Factors 85

3.5 Application to a Two Freeform Mirror Condenser 88

3.6 Étendue Squeezing in Optical Manifolds 95

3.7 Conclusions 95

Appendix 3.A Galilean Afocal System 96

Appendix 3.B Keplerian Afocal System 98

References 99

CHAPTER 4 SMS 3D DESIGN METHOD 101

4.1 Introduction 101

4.2 State of the Art of Freeform Optical Design Methods 101

4.3. SMS 3D Statement of the Optical Problem 103

4.4 SMS Chains 104

4.4.1 SMS Chain Generation 105

4.4.2 Conditions 106

4.5 SMS Surfaces 106

4.5.1 SMS Ribs 107

4.5.2 SMS Skinning 108

4.5.3 Choosing the Seed Rib 109

4.6 Design Examples 109

4.6.1 SMS Design with a Prescribed Seed Rib 110

4.6.2 SMS Design with an SMS Spine as Seed Rib 111

4.6.3 Design of a Lens (RR) with Thin Edge 115

4.6.4 Design of an XX Condenser for a Cylindrical Source 117

4.6.5 Freeform XR for Photovoltaics Applications 129

4.7 Conclusions 140

References 144

CHAPTER 5 SOLAR CONCENTRATORS 147

5.1 Concentrated Solar Radiation 147

5.2 Acceptance Angle 148

5.3 Imaging and Nonimaging Concentrators 156

5.4 Limit Case of Infi nitesimal Étendue: Aplanatic Optics 164

5.5 3D Miñano Benitez Design Method Applied to High Solar Concentration 171

5.6 Köhler Integration in One Direction 180

5.7 Köhler Integration in Two Directions 195

5.8 Appendix 5.A Acceptance Angle of Square Concentrators 201

5.9 Appendix 5.B Polychromatic Effi ciency 204

Acknowledgments 207

References 207

CHAPTER 6 LIGHTPIPE DESIGN 209

6.1 Background and Terminology 209

6.1.1 What is a Lightpipe 209

6.1.2 Lightpipe History 210

6.2 Lightpipe System Elements 211

6.2.1 Source/Coupling 211

6.2.2 Distribution/Transport 211

6.2.3 Delivery/Output 212

6.3 Lightpipe Ray Tracing 212

6.3.1 TIR 212

6.3.2 Ray Propagation 212

6.4 Charting 213

6.5 Bends 214

6.5.1 Bent Lightpipe: Circular Bend 214

6.5.2 Bend Index for No Leakage 215

6.5.3 Refl ection at the Output Face 216

6.5.4 Refl ected Flux for a Specifi c Bend 217

6.5.5 Loss Because of an Increase in NA 218

6.5.6 Other Bends 219

6.6 Mixing Rods 220

6.6.1 Overview 220

6.6.2 Why Some Shapes Provide Uniformity 221

6.6.3 Design Factors Infl uencing Uniformity 223

6.6.4 RGB LEDs 226

6.6.5 Tapered Mixers 228

6.7 Backlights 233

6.7.1 Introduction 233

6.7.2 Backlight Overview 234

6.7.3 Optimization 235

6.7.4 Parameterization 235

6.7.4.1 Vary Number 236

6.7.4.2 Vary Size 236

6.7.5 Peak Density 237

6.7.6 Merit Function 237

6.7.7 Algorithm 238

6.7.8 Examples 239

6.8 Nonuniform Lightpipe Shapes 245

6.9 Rod Luminaire 246

Acknowledgments 247

References 247

CHAPTER 7 SAMPLING, OPTIMIZATION, AND TOLERANCING 251

7.1 Introduction 251

7.2 Design Tricks 253

7.2.1 Monte Carlo Processes 254

7.2.2 Reverse Ray Tracing 257

7.2.3 Importance Sampling 260

7.2.4 Far–Field Irradiance 263

7.3 Ray Sampling Theory 266

7.3.1 Transfer Effi ciency Determination 266

7.3.2 Distribution Determination: Rose Model 268

7.4 Optimization 272

7.4.1 Geometrical Complexity 273

7.4.2 Merit Function Designation and Calculation 280

7.4.3 Optimization Methods 281

7.4.4 Fractional Optimization with Example: LED Collimator 282

7.5 Tolerancing 289

7.5.1 Types of Errors 290

7.5.2 System Error Sensitivity Analysis: LED Die Position Offset 290

7.5.3 Process Error Case Study: Injection Molding 291

References 297

INDEX 299

O autorze

John Koshel (Tucson, AZ), obtained Ph.D in Optics from University of Rochester in 1996. He is currently an adjunct assistant professor at University of Arizona, Optical Sciences Center. He also works as a vice president of optical engineering consulting firm, Photon Engineering, LLC. He frequently chairs at SPIE conferences and provides tutorial on the subject (nonimaging optics). He is a well respected figure in the International optical engineering community publishing numerous peer reviewed papers.

Blurb

A rare and valuable compendium of nonimaging/illumination optics written by industry experts

Within the past decade, the field of optical design has included the subfield of illumination design. Visual illumination systems include displays, lighting, and the illuminator for photocopiers. Non–visual illumination systems include solar concentrators, optical laser pump cavities, and a number of optical sensor applications. With a main focus on the use of nonimaging optics in illumination systems, this informative book introduces a number of topics that have received little coverage in previously existing literature while expanding on the fundamental limits.

Illumination Engineering: Design with Nonimaging Optics offers up an overview of the field of nonimaging and illumination optics and includes terminology, units, definitions, and descriptions of the optical components used in illumination systems. Editor R. John Koshel a prominent figure in this field provides material within the theoretical domain, including étendue, étendue squeezing, and the skew invariant while focusing on a growing number of applications.

Presenting a wealth of material in an increasingly important area, this book provides:

 Cutting–edge material in the field of nonimaging and illumination optics from experts within the field

 A wide number of topics for practicing engineers and scientists to expand their knowledge into subfields within nonimaging and illumination optics

 Extensive references that readers can employ to expand upon the presentations herein

Illumination Engineering: Design with Nonimaging Optics is an ideal source for practicing illumination engineers and scientists, and graduate–level electrical engineering/optical engineering students.