Zeeman atomic absorption spectrophotometer
AssigneesHitachi, Ltd., Hitachi Naka Seiki, Ltd.
InventorsHideaki Koizumi, Hitoshi Sawakabu
Life of this patent
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Abstract
In a Zeeman atomic absorption spectrophotometer, an atomic absorption signal in an atomization stage is observed. The length of time between an instant at which the signal initially attains a predetermined absorbance and an instant at which the signal attains the same predetermined absorbance for the last time during the atomization stage is measured. By utilizing this time measurement as an indication of concentration, the concentration of the sample can be measured at higher concentrations than the limit concentration in the analysis by a conventional apparatus of this kind.
Claims40
A Zeeman atomic absorption spectrophotometer comprising:
- a light source;
- an atomization section irradiated with the light from said light source including means for atomizing a sample;
- a detector coupled to receive the light emitted from said light source and then subjected to atomic absorption in said atomization section, and to convert the light into an electric signal;
- means for generating a pair of Zeeman split light components emitted from the light source including means for applying a magnetic field to the light source;
- means coupled to the output of said detector for processing the detected signal and producing an atomic absorption signal for the sample, which signal is corrected for background absorption;
- and
- means for measuring, during a stage of atomization of the sample in said atomization section, the length of time between an instant at which the intensity of the background absorption-corrected atomic absorption signal initially reaches a predetermined level and an instant at which the intensity of the same signal reaches the same predetermined level for the last time during said stage of atomization.
A Zeeman atomic absorption spectrophotometer comprising:
- means for positioning an atomized unknown sample on an optical axis;
- means positioned along the optical axis to pass light from a light source of a predetermined wavelength through atomic vapors of said atomized sample;
- means for generating Zeeman split light components emitted from the light source including means for applying a magnetic field to said light source;
- means for detecting the Zeeman split light components which have passed through the atomic vapors to provide an atomic absorption signal;
- and
- means for successively detecting instants t.sub.0, t.sub.1 . . . t.sub.n at which a detected atomic absorption signal attains a predetermined level and for determining the difference between t.sub.n and t.sub.0.
A Zeeman atomic absorption spectrophotometer comprising:
- a light source;
- an atomization section irradiated with the light from said light source including means for atomizing a sample;
- a detector coupled to receive the light emitted from said light source and then subjected to atomic absorption in said atomization section, and to convert the light into an electric signal;
- means for generating a pair of Zeeman split components produced in the atomization section including means for applying a magnetic field to the atomization section;
- means coupled to the output of said detector for processing the detected signal and producing an atomic absorption signal for the sample, which signal is corrected for background absorption;
- and
- means for measuring, during a stage of atomization of the sample in said atomization section, the length of time between an instant at which the intensity of the background absorption-corrected atomic absorption signal initially reaches a predetermined level and an instant at which the intensity of the same signal reaches the same predetermined level for the last time during said stage of atomization.
A Zeeman atomic absorption spectrophotometer comprising:
- means for positioning an atomized unknown sample on an optical axis;
- means positioned along the optical axis to pass light of a predetermined wavelength through atomic vapors of said atomized sample;
- means for generating Zeeman split light components produced in the atomized sample including means for applying a magnetic field to said atomized sample;
- means for detecting the light which has passed through the atomic vapors to provide an atomic absorption signal;
- and
- means for successively detecting instants t.sub.0, t.sub.1 . . . t.sub.n at which a detected atomic absorption signal attains a predetermined level and for determining the difference between t.sub.n and t.sub.0.
Dependencies are inferred from the claim text.