Spectral bandwidth standard based o nsymmetrical absorption bands of a crystal standard

摘要

A calibration procedure of spectral bandwidth of high-resolution spectrophotometers resurring to the symmetrical absorption bands of a crystal standard is described. The method involves spectral lines shape fitting followed by convolution with the flit function of the spectrophotometer. A calibration curve on transmittance versus spectral bandwidth is provided for practical and accurate metrological verification of the actual spectral bandwidth of the spectrophotometer. Results will be provided on the testing of the method on an intercomparison of spectral bandwidth calibration involving twenty laboratories.