Spectrophotometer, spectroscopic measurement method, and program

A spectroscopic measurement method used in a spectrophotometer including

• a light source;
• a spectroscope that splits light from the light source;
• an optical path switch that switches an optical path of light emitted from the spectroscope to a sample optical path that reaches a measurement sample whose absorbance changes depending on a wavelength range or a control optical path that reaches a control sample;
• a detector that detects sample light that has passed through the measurement sample and control light that has passed through the control sample;
• a data processing unit that derives absorbance of the measurement sample based on a measurement sample signal of the sample light and a control sample signal of the control light detected by the detector;
• a plurality of dimming plates having different dimming rates;
• a dimming plate switching unit that is able to switch and install the plurality of dimming plates in the control optical path;
• and
• a storage that stores measurement conditions including one of the plurality of dimming plates and a scanning speed for each of a plurality of wavelength ranges which has different absorbance for the measurement sample,
• the method comprising a step of changing a dimming plate and the scanning speed corresponding to each of the plurality of wavelength ranges according to the measurement conditions when the entire measurement wavelength range including the plurality of wavelength ranges is scanned at once.

A program causing a spectrophotometer to execute a spectroscopic measurement method, the spectrophotometer including

• a light source;
• a spectroscope that splits light from the light source;
• an optical path switch that switches an optical path of light emitted from the spectroscope to a sample optical path that reaches a measurement sample whose absorbance changes depending on a wavelength range or a control optical path that reaches a control sample;
• a detector that detects sample light that has passed through the measurement sample and control light that has passed through the control sample;
• a data processing unit that derives absorbance of the measurement sample based on a measurement sample signal of the sample light and a control sample signal of the control light detected by the detector;
• a plurality of dimming plates having different dimming rates;
• a dimming plate switching unit that is able to switch and install the plurality of dimming plates in the control optical path;
• and
• a storage that stores measurement conditions including one of the plurality of dimming plates and a scanning speed for each of a plurality of wavelength ranges which has different absorbance for the measurement sample,
• the program executing the spectroscopic measurement method including:
• a step of changing a dimming plate and the scanning speed corresponding to each of the plurality of wavelength ranges according to the measurement conditions when the entire measurement wavelength range including the plurality of wavelength ranges is scanned at once.