Method of calibrating spectral apparatus and method of producing calibrated spectral apparatus

A method of calibrating a spectral apparatus, the method comprising:

• a step a) of causing the spectral apparatus to be calibrated, the spectral apparatus including:
• an optical system that converts light to be measured into a spectrum;
• and a light-receiving sensor including a plurality of sensors that outputs a plurality of signals, the plurality of sensors including sensors that outputs signals indicating respective energy amounts of a plurality of wavelength components included in the spectrum;
• a step b) of acquiring, for each of the plurality of sensors, reference spectral sensitivity of the sensor;
• a step c) of acquiring, for each of the plurality of sensors, an indicator indicating the reference spectral sensitivity of the sensor acquired at the step b);
• a step d) of creating, for each of the plurality of sensors, a model in which a linear function of an indicator indicating a mechanical error in the spectral apparatus, expresses deviation of an indicator indicating spectral sensitivity of the sensor from the indicator indicating the reference spectral sensitivity of the sensor, acquired at the step c);
• a step e) of acquiring the indicator indicating the mechanical error in the spectral apparatus, to adapt the spectral sensitivity of the sensor indicated by the indicator indicating the spectral sensitivity of the sensor, included in the model created at the step d), to the signal output by the sensor;
• a step f) of acquiring, for each of the plurality of sensors, the deviation of the indicator indicating the spectral sensitivity of the sensor from the indicator indicating the reference spectral sensitivity of the sensor, with the model created at the step d) and the indicator indicating the mechanical error in the spectral apparatus, acquired at the step e);
• and
• a step g) of acquiring, for each of the plurality of sensors, the spectral sensitivity of the sensor, with the reference spectral sensitivity of the sensor acquired at the step b) and the deviation of the indicator indicating the spectral sensitivity of the sensor from the indicator indicating the reference spectral sensitivity of the sensor, acquired at the step f).