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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 54,
  • Issue 9,
  • pp. 1321-1326
  • (2000)

Wavelength Calibration of a Dispersive Near-Infrared Spectrometer Using Trichloromethane as a Calibration Standard

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Abstract

Since differences in wavelength calibration between instruments are arguably a primary source of error encountered in the transfer of calibration models from one instrument to another in near-infrared (NIR) spectroscopy, a readily available, convenient, inexpensive secondary wavelength calibration standard for the NIR spectral region is needed. This paper describes the advantages of trichloromethane as a wavelength standard for the calibration of dispersive NIR spectrometers used in the transmission mode. The spectrum of trichloromethane, taken with a Fourier transform NIR spectrometer whose wavenumber scale was calibrated with the ro-vibrational lines of ethyne as determined by the National Institute of Standards and Technology (NIST), is presented. The wavelengths of four strong, sharp, well-resolved bands of trichloromethane were determined with the calibrated Fourier transform NIR spectrometer and were found to be 1152.13 ± 0.01 nm (3υ<sub>1</sub>), 1410.21 ± 0.01 nm (2υ<sub>1</sub> + υ<sub>4</sub>), 1691.9 ± 0.7 nm (2υ<sub>1</sub>), and 1861.22 ± 0.01 nm (υ<sub>1</sub> + 2υ<sub>4</sub>). These bands were then used to calibrate the wavelength scale of a commercial 0.25 m monochromator equipped with a 300 line mm<sup>-1</sup> grating. The calibration revealed that, while the wavelength scale of the monochromator was linear, there was a systematic error of about +12 nm in the NIR region.

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