Patent ID: 8107072

Claim:
An atomic absorption spectrophotometer comprising: a) an optical system for dividing a light emitted from a light source into two directions so that one divided light passes through an atomization unit of a sample and an other divided light passes through a space other than the atomization unit, after that introducing each light into a sector mirror rotated by an alternating-current motor so that the divided lights alternately enter a spectroscope, and sending a light separated by the spectroscope to a detector; b) a light source controller for turning ON the light source for a predetermined lighting period, in synchronization with a rotation of the sector mirror; and c) a sampling data extractor for extracting sampling data of a detection signal generated from the detector during a predetermined extraction period, in synchronization with the rotation of the sector mirror; wherein the atomic absorption spectrophotometer comprises: d) a memory means for memorizing a plurality of setting values of the lighting period and the extraction period, in association with a frequency of an alternating-current power source for driving the alternating-current motor; e) a frequency identifying means for identifying the frequency of the alternating-current power source; and f) a lighting/extraction period setting means for reading out a setting value from the memory means, corresponding to the frequency identified by the frequency identifying means, and setting, based on the setting value, the lighting period of the light source and the extraction period of the sampling data.