Accurate wavelength calibration method for compact CCD spectrometer

Area of Science:

• Spectroscopy
• Optical Engineering
• Instrument Calibration

Background:

• Accurate wavelength calibration is essential for reliable data acquisition in charge-coupled device (CCD) spectrometers.
• Existing calibration methods may lack the required precision for certain scientific applications.
• The performance of CCD spectrometers is directly linked to the accuracy of their wavelength calibration.

Purpose of the Study:

• To propose and validate a new, highly accurate wavelength calibration method for CCD spectrometers.
• To demonstrate the superiority of the proposed method over traditional wavelength calibration techniques.
• To achieve wavelength calibration deviations within 0.1 nm.

Main Methods:

• Development of a line profile spectrum model.
• Implementation of noise reduction and bandwidth correction algorithms.
• Application of automatic peak-seeking treatment for spectral line identification.
• Experimental validation using a USB4000 spectrometer and a mercury-argon calibration source.

Main Results:

• The proposed wavelength calibration procedure demonstrated significantly higher accuracy compared to traditional methods.
• Experimental results confirmed deviations within 0.1 nm for the implemented calibration technique.
• The method proved effective in precise spectral line identification and correction.

Conclusions:

• The presented wavelength calibration method offers enhanced accuracy for CCD spectrometers.
• This improved calibration technique is suitable for applications demanding high precision.
• The findings contribute to more reliable spectroscopic measurements using CCD-based instruments.