Workshop #2 - Wednesday, September 28

Wednesday, September 28  13:00 - 16:00 
Test and Measurement of LEDs and LED Systems

This workshop will provide participants with a working knowledge of the optical properties of LEDs and how to measure them correctly. The principal topics of the workshop will include:

• Fundamentals of radiometry and photometry, SSL terms and integrating spheres and hemispheres
­  Radiometric and photometric units and language; a breakdown of units and terms spanning lumens
  to W/m2-sr-nm, color and CCT ­ SSL metrology fundamental terms; an explanation of CIE/IES
  terms   for SSL-specific measurements ­ Integrating sphere/hemisphere photometry and 
  spectrophotometry

• Photometric calibration technique and necessary factors for certifying lamps and LED standards
- Growing need for measuring lighting standard
- International traceability system in the lighting industry

• Total luminous flux measurement system using integrating hemisphere photometer
- Principle of traditional integrating sphere
- Error factors of integrating sphere
- New integrating hemisphere geometry and principle
- Surface illuminant measurement by integrating hemisphere
- Comparison in the measurement values of the integrating sphere and hemisphere.

• LED phosphor materials analysis – absolute quantum yield measurement for phosphor solution
-  Principal of quantum efficiency measurement
- How to measure quantum yield of solution sample
- Shooting technical problem such as to eliminate re-excitation

• Hands on measurements with audience participation
­  Calibration standards, and set up
­  Calibration exercise
­  Sample set up, 2pi versus 4pi
­  Absorption correction and effects
­  LED and SSL measurements: electrical, optical  and thermal
­  LED vs. QTH lumen standards

The workshop will enable participants to:

• Understand the various optical properties of LEDs (radiometric, photometric, colorimetric)
• Perform measurements consistent with current standards and understand the trends
  in accepted methodology
• Specify measurement systems and conditions for LED measurement
• Identify and control critical parameters that affect accuracy

PRESENTERS:

Greg McKee
Vice President of Engineering
Labsphere Inc.

Greg McKee is the VP of Engineering for Labsphere Inc. His career history includes various positions of responsibility for the strategic business development and support of light metrology solutions for the remote sensing, imaging, non-image, laser, LED, SSL and general lighting. Over the years he has managed numerous projects to successful completion as well introducing many innovative new products to market. He is regularly invited to speak on behalf of Labsphere at various global conferences and industry events. Greg currently serves as an Executive Officer and Director for the Council for Optical Radiation Measurements (CORM). He has served as Chairman of CORM Technical Committee on Integrating Flux Devices and continues to be an active participant of LTEC, and IESNA TPCs for Photometry of Light Sources and Solid State Lighting

Dr. Yang Wang
Application and Optical Calibration Laboratory Manager
Labsphere Inc.

Dr. Yang Wang is the Applications and Optical Calibrations Laboratory Manager at Labsphere, specializing in optical metrology and sensor/imaging testing systems. Throughout his career, Dr. Wang has been dedicated to optical/optoelectronic system engineering and has contributed his expertise to multiple custom systems and calibrations. Dr. Wang joined Labsphere in August 2008.

Kosei Oshima
Head of Calibration Laboratory
Otsuka Electronics Co.,Ltd

Kosei Oshima has been with Otsuka Electronics (formerly Union Giken) for 28 years. Through his career, he has been involved with the application development of fiber optics polychrometers, HPLC analyzers, LCD evaluation systems and film thickness monitors. He recently established the Photometric Calibration Laboratory which is based on the Measurement Law of Japan (JCSS) and accredited by IAJapan, which is a signatory to the Mutual Recognition Arrangement (MRA) of ILAC and APLAC. He is an active member of JIS drafting committee, JELMA and JLEDS. In CIE he is an active member of TC2-50, TC2-63 and other LED optical measure related committees.

Dr. Kazuaki Ohkubo
Division Manager R&D
Otsuka Electronics Co.,Ltd   

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Dr. Kauaki Ohkubo has been with Otsuka Electronics for five years as the Development Division Manager.  He has developed the integrating hemisphere and other light measurement systems. Throughout his career of over 25 years he has accumulated his knowledge in photometry and radiometry.