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Band Position to Frequency Converter


If the speed of the moving mirror (scanning speed) and the laser wavelength are known, the position of a band in the infrared spectrum can be converted to real frequencies and vice versa.

Band position:

cm-1

  

Scanning Speed:

kHz

Frequency:

Hz

  

Laser Frequency:

cm-1
The default values of Scanning Speed and Laser Frequency provide a starting point, but can be changed. The Scanning Speed changes often from measurement to measurement, whereas the Laser Frequency is usually a fixed number (can change slightly). Most of the modern FTIR spectrometers use a HeNe laser as an internal standard for the frequency calibration.

This small calculator is particularly useful to determine the optimal Scanning Speed for a measurement in case there is a fixed frequency noise appearing in the spectrum. By changing the Scanning Speed, the noise can be moved into a spectral region where it doesn’t disturb the measurement of the particular sample.

Formula: Frequency [Hz] = (BandPosition [cm-1] * ScannerSpeed [Hz]) / LaserFrequency [cm-1]