
57 |
P a g e
R e v 5 - 1 9
Custom Smoothing
Attempts to “smooth” the analysis curve as the value increases to fit the original interference curve
better.
Momentum
This is the number of adjacent points that are required to show a change in the peak direction. The
minimum number of points to make a line is 2.
Waveform Type
Standard
is typically used and allows the peak analysis to track the major waveform pattern.
Amplitude
Modulated
is used if there is a thin layer being measured with a thick layer present. Amplitude
Modulated will attempt to track “over” the thicker wave curves, as the thinner layer waveform may be
superimposed over the thicker curves. Amplitude Modulated would create the peak analysis curve to
match the thin coating waveform.
Starting/Ending Wavelength
The wavelength is the range of light spectrum that is being measured to produce a reading. Sensory
Analytics currently measures in 2 different spectral ranges: Visible spectrum which ranges from 200 nm
– 1000 nm, and Near Infra-red (NIR) which is from 900 nm – 1700 nm. When you adjust, the wavelength
ranges you are narrowing the available spectrum in which is measured. This becomes apparent in the
Wave graph as you slide the Start or End wavelength indicator.
Index of Refraction
The Index of Refraction is the dimensionless number which describes how fast light propagates through
the material. Changing the IOR will not change the wavelength or wave graph, but will have a direct
impact on the peak graph and the resulting thickness.
Min/Max Thickness
Minimum and Maximum thickness are what define the absolute thickness parameters. If a value
produced is outside of the range of the min/max thickness the result will not be accepted. These values
are typically adjusted to isolate a layer from other layers, or to prevent anomalies like “double
refraction.”
Target Spec
This is the defined target from the recipe. If Target is changed, the Min/Max Thickness values will
automatically change
+/- Tolerance
This is the defined target range from the recipe. If the tolerance zone is modified, the Min/Max
Thicknesses will adjust automatically.
Advanced settings will need to be altered in the Recipe tab.