BYK-mac i Multi-angle color, effect and fluorescence measurement. Gabriele Kigle-Böckler, BYK-Gardner GmbH, 2013
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1 BYK-mac i Multi-angle color, effect and fluorescence measurement Gabriele Kigle-Böckler, BYK-Gardner GmbH, 2013
2 What is Fluorescence? (A) (B) Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. It is a form of luminescence. In most cases, the emitted light has a longer wavelength, and therefore lower energy, than the absorbed radiation. The mineral Fluorite (A) emits visible light when exposed to ultraviolet light (B). Sources:
3 Intensity What is Fluorescence? Stokes Shift: The emitted energy is divided in heat and light Fluorescent light has lower energy long wavier than the excited light. Stokes Shift Typical Application: Excited spectrum Emitted spectrum Paper with optical brightners Textiles with optical brightners Automotive colors? Wavelength Excitement UV Blue Green Emission Blue / Green / Yellow / Red Green / Yellow / Red Yellow / Red Page 3, BYK-Gardner GmbH, BYK-mac Präsentation
4 Color spectrophotmeter with polychrome illumination Microprozessor Spectrometer Light source Xenon flash Halogen lamp Tungsten lamp Object 8/1/2013, Page 4, BYK-Gardner, Farbmessung
5 Principle: Spectrophotometer with polychrome illumination Sample Spectrometer % Reflexion Spectral data Red Wavelength Fluorescent samples are always metamer! Light source Amount of excited light is dependent on light source (Tungsten lamp Xenon flash LED) Amount of fluorescence will vary with lamp ageing Inter-instrument agreement often poor on fluorescent samples 8/1/2013, Page 5, BYK-Gardner, Farbmessung
6 BYK-mac with sequential monochrome illumination Sample Sensor % Reflexion Spectral data Red Wavelength LED s Fluorescent Sample LED s Allocation of emitted fluorescent light to excitation wavelength 8/1/2013, Page 6, BYK-Gardner, Farbmessung
7 Polychrome Illumination vs Monochrome illumination Traditional technique Polychrome illumination Continuous spectrum Light dispersion on detector side Detector: Spectrometer or Filters Amount of excited light dependent on type/age of light source Allocation of emitted fluorescence light to emission wavelengths BYK-mac Monochrome illumination 26 single LEDs Light dispersion on the illumination side Detector: Photodiode integrating signal Amount of excited light constant due to LED stability Allocation of emitted fluorescence light to excitation wavelength
8 Example RAL 3020-GL Traffic Red Absolute Comparison BYK-mac: Fluorescence light is allocated to excitation wavelength 8/1/2013, Page 8, BYK-Gardner, Farbmessung
9 Fluorescence in Automotive Colors? Fluorimeter setup Spectrometer Xe arc lamp Monochromator I Power supply I λ BYK mac λ Photos: Sample
10 Results of the pigment investigation Organic pigments applied in automotive and industrial paints P.Y. 139: Yellow P.Y. 185: Yellow (not common in automotive OEM) P.R. 178: Red P.R. 179: Red P.R. 282: Red (not common in automotive OEM) P.O. 73: Orange P.V. 19: Violet (gamma modification) Fluorescent light might appear when using these pigment types. The fluorescence effect is influenced by the production process and the interaction of the components. Only small amount of automotive colors affected
11 Results of pigment investigation Example: P.Y. 139: Yellow
12 Results of the pigment investigation Example P.V. 19: Violett gamma modification
13 Results of pigment investigation Example: P.R. 179: Red PR 179 drawdown: Masstone Automotive Red Color
14 BYK-mac i: New technology BP1 BP2 4 fluorescence detectors Measuring fluorescence light at shifted wavelength Allocation of fluorescent light to emmission wavelength Quantification of fluorescence excited in the visible range BP3 BP4
15 Comparison to conventional spectrophotometer Absolute color comparison Fluorescent Color RAL 3020-GL Traffic Red BYK-mac i: Fluorescence light is allocated to emission range BYK-mac BYK-mac i Page 15, BYK-Gardner GmbH
16 Reflectance Measurement & Quantification of Fluorescence 0,007 Fluorescence Light 0,006 0,005 0,004 0,003 0,002 0, Wavelength (nm) 78 PWD: Perfect White Diffuser RAL 3020 Int Emission = 7%
17 Fluorescent Color RAL 3020: UV light exposure Int Emission value high Indication of poor light fastness Original part (Reference) UV exposed part (less fluorescent) Page 17, BYK-Gardner GmbH
18 New BYK-mac i
19 New BYK-mac i: Introduction Launch of new BYK-mac i Upgrade BYK-mac to BYK-mac i September 2013 Page 19, BYK-Gardner GmbH
20 Thank you for your attention.
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