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Development of a Tunable LED-Based Colorimetric Source.

Steven W Brown1, Carlos Santana1, George P Eppeldauer1

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899-0001.

Journal of Research of the National Institute of Standards and Technology
|July 23, 2016
PubMed
Summary
This summary is machine-generated.

A new spectrally tunable light source using light-emitting diodes (LEDs) can accurately simulate standard light sources for radiometric, photometric, and colorimetric applications, enabling precise scale propagation with minimal uncertainty.

Keywords:
colorimetryintegrating spherelight emitting diodephotometryradiometry

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Area of Science:

  • Optical Engineering
  • Metrology
  • Solid-state lighting

Background:

  • Radiometric, photometric, and colorimetric measurements require stable and accurate light sources.
  • Existing light sources may lack spectral tunability, limiting their application in calibrating diverse instruments.
  • Light-emitting diodes (LEDs) offer potential for creating tunable light sources due to their spectral characteristics and controllability.

Purpose of the Study:

  • To develop and demonstrate a spectrally tunable LED-based light source for radiometric, photometric, and colorimetric applications.
  • To enable accurate simulation of standard and special light sources.
  • To facilitate the propagation of photometric and colorimetric scales with minimal uncertainty.

Main Methods:

  • Integration of 40 LEDs with 10 distinct spectral distributions into an integrating sphere.
  • Development and implementation of a voltage-to-current control circuit for independent LED current adjustment.
  • Characterization of LED stability and drive current dependence.
  • Simulation of spectral distribution approximations and uncertainty analysis.

Main Results:

  • A prototype tunable LED light source was successfully developed, demonstrating feasibility.
  • Simulations indicate the source can approximate standard light source distributions (380 nm–780 nm) with ~2% deviation.
  • The source can simulate spectral distributions of special sources like discharge lamps and display monitors.
  • Target uncertainties for calibration are <2% in luminance and 0.002 in chromaticity.

Conclusions:

  • The spectrally tunable LED light source is a viable technology for advanced radiometric, photometric, and colorimetric applications.
  • This tunable source offers a flexible and accurate method for calibrating test instruments against various spectral distributions.
  • The developed system minimizes uncertainty in propagating photometric and colorimetric scales, enhancing measurement accuracy.