Over time, spectrometers will naturally drift due to environmental effects and influences. This is a common issue that can easily be addressed by regular wavelength calibration which helps to ensure reliable and accurate spectroscopic results.
How is Wavelength Calibration Performed?
Wavelength calibration of a spectrometer is performed by scanning through grating angles and measuring spectrum with wavelengths which are already known. The measured wavelength and the known wavelength can be compared and the drift can be found.
The standard method for wavelength calibration is the peak method, which is used for the calibration of push-broom imaging spectrometers by recording the digital number values of wavelengths and the Gaussian fitting of the wavelengths which results in the pixel center wavelength being found by calculating the highest response.
Many factors can affect the measurement, meaning the wavelength calibration process must correct
