Thermo Scientific Evolution 200 Series User Manual page 93

Converting Scan Data to a Derivative
Thermo Scientific
Related Topics
About Smoothing
Converting Scan Data to a Derivative
Converting Scan Data to Other Units
Adding Two Scan Spectra
Normalizing Scan Data
Subtracting a Scan Spectrum
Ratioing Two Scan Spectra
Averaging Scan Spectra
Adding, Subtracting, Multiplying or Dividing Scan Data by a Factor
Finding Peaks in Scan Data
Finding Value Level Crossings in Scan Data
About Smoothing
The smoothing feature of INSIGHT software uses a Savitzky-Golay algorithm modified to
reduce high frequency breakthrough; that is, to reduce noise in the spectrum. The algorithm
is based on performing a least-squares linear regression fit of a polynomial of order k over at
least k+1 data points around each point in the spectrum.
Use Derivative in the Math menu to convert scan data to the first, second, third or fourth
derivative.
To convert scan data to a derivative
1. Choose Math (menu) > Derivative.
The selected spectrum appears in the Operands pane.
The workbook spectra are listed at the left. To add others:
a. Click Browse.
b. Select a folder in the left pane (use the features above it to navigate), a workbook in
the middle pane, and spectra in the upper-right pane. To select multiple spectra, hold
down Shift or Ctrl. Selected spectra appear in the lower-right pane.
c. Click OK. Each added spectrum is listed with asterisks at the beginning of its name
to indicate the data is not in the current workbook.
2
INSIGHT Software
Operation
Evolution 200 Series User Guide 79