[Study on the method of FTIR spectrum non linear multiple point calibration].

Area of Science:

• Spectroscopy
• Analytical Chemistry
• Physical Chemistry

Context:

• Fourier Transform Infrared (FTIR) spectroscopy is a vital analytical technique with widespread applications.
• Accurate spectral data is crucial for reliable results in various scientific fields.
• Instrument response variations across different wavebands necessitate rigorous calibration.

Purpose:

• To develop and validate a robust calibration arithmetic for FTIR spectrometers.
• To address the issue of uncalibrated spectra lacking absolute or relative intensity information.
• To compare linear and non-linear calibration methods for FTIR spectral data.

Summary:

• This paper details linear and non-linear multiple point calibration methods for FTIR spectrometers.
• Blackbody spectra at varying temperatures were measured, with some used for calibration and one for testing.
• The non-linear multiple point calibration method demonstrated excellent performance, achieving high spectral accuracy.

Impact:

• The validated non-linear calibration method significantly enhances the precision of FTIR spectral data.
• Achieved relative error between calibrated and standard blackbody spectra was approximately 0.2%, with a maximum below 0.4%.
• Improved calibration techniques ensure more reliable quantitative analysis and data interpretation in FTIR spectroscopy.