Patent ID: 9557261
Date: 2017-01-31
CPC Classifications: G01N

Claim:
1. A spectroscopic analyzer comprising: a light source; a measurement cell storing a liquid sample irradiated with light of the light source during sample measurement; a dimmer being irradiated with the light of the light source during reference measurement, and transmitting a part of the light; a light detector configured to detect sample light which has passed through the measurement cell during sample measurement and configured to detect reference light which has passed through the dimmer during reference measurement; an amplifier configured to amplify an analog sample light intensity signal outputted from the light detector during sample measurement and configured to amplify an analog reference light intensity signal outputted from the light detector during reference measurement; an A/D converter configured to convert the analog sample light intensity signal into a digital sample light intensity signal and to configured amplify the analog reference light intensity signal into a digital reference light intensity signal; and a processor configured to calculate an absorbance of the liquid sample using the digital sample light intensity signal outputted from the A/D converter during the sample measurement and by using the digital reference light intensity signal outputted from the A/D converter during the reference measurement, wherein the dimmer has lower transmittance than that of optical glass, the dimmer having water as its component or being an optical filter; and the analog sample light intensity signal and analog reference light intensity signal inputted to the A/D converter are amplified in a manner such that the digital reference light intensity signal and the digital sample light intensity signal become less than or equal to a full scale of the A/D converter.