SBAA615 December   2023 OPT4003-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Light Source Detection
  6. 3Light Source Ratios
  7. 4Design and Calibration Considerations
    1. 4.1 Cover Materials
    2. 4.2 Cover Glass Application Example
  8. 5Near Infrared Components of Common Light Sources
    1. 5.1 Incandescent
    2. 5.2 Halogen
    3. 5.3 Light Emitting Diode
    4. 5.4 Fluorescent
    5. 5.5 Sunlight
  9. 6Summary
  10. 7References

1 Introduction

Detecting the type of light that is being produced by a source can be an important feature for different applications. For example, in headlight systems light source detection can be used to distinguish between sunlight and artificial light to more accurately control illumination. Automatic display brightness controls need to adjust differently depending on the type of light in the environment, and it is necessary to distinguish between sunlight and other light sources.

The ratio of visible to NIR light is unique for different light sources, forming the basis of light source detection which is discussed in this report. Figure 1-1 illustrates the various visible to NIR light ratios of common sources. The specific test setup used to collect this data is described in more detail in Section 3.

GUID-5BC1E566-3DF1-4CEB-88A6-467A36841B98-low.svg Figure 1-1 OPT4003-Q1 Visible and NIR Channel Ratios