Double polarized light beam spectrophotometer of light source modulation type

A double polarized light beam spectrophotometer system of a light-source modulation type operated from a power supply source, comprising:

• means for modulating light emitted by a light source;
• atomizing means positioned to receive said modulated light for generating an atom vapor of a specimen and for causing said modulated light to undergo atomic absorption of polarized light components of the modulated light as it passes through the atom vapor;
• optical means for selecting a wavelength of the light which has undergone atomic absorption in said atomizing means and for spatially separating the light of the selected wavelength into a pair of linearly polarized light beams;
• extracting means for alternately extracting said pair of the linearly polarized light beams separated by said optical means;
• photoelectric conversion means for receiving said pair of the linearly polarized light beams alternately extracted by said extracting means and for providing signals corresponding to said pair of linearly polarized light beams;
• means for determining the light absorption of said specimen on the basis of the signals corresponding to said pair of the linearly polarized light beams detected by said photoelectric conversion means;
• and
• synchronizing means for synchronizing at least the switching of said alternate extraction means with the phase of modulation of said light modulating means, wherein said extracting means is composed of a chopper device which includes a disc-like chopper having light transmitting portions and light interrupting portions for extracting alternately said pair of the linearly polarized light beams, and drive means for driving said chopper composed of a motor rotated in synchronism with a frequency of said power supply source, and wherein said atomizing means is constituted by an atomizer heated by a current having the same frequency as that of the output of said power supply source for driving said motor.

A double polarized light beam spectrophotometer system of a light-source modulation type operated from a power supply source, comprising:

• light modulating means for modulating light emitted by a light source;
• atomizer means positioned to receive said modulated light and driven by electric heating means for producing an atom vapor of a specimen and for causing said modulated light to undergo atomic absorption of polarized light components of the modulated light as it passes through the atom vapor;
• optical means for selecting a wavelength of the light which has undergone said atomic absorption and for spatially separating the light of the selected wavelength into a pair of linearly polarized light beams;
• a pair of photoelectric conversion means for receiving, respectively, said pair of the linearly polarized light beams separated by said optical means;
• means for determining light absorption of said specimen on the basis of signals corresponding to said pair of the linearly polarized light beam detected by said photoelectric conversion means;
• and
• synchronizing means for synchronizing the phase of modulation of said light modulating means with the phase of a driving current which is supplied to said atomizer means.