Lorentz-force-free alternating current Zeeman background correction atomic absorption device and method
An atomic absorption and background correction technology, which is applied in material excitation analysis, thermal excitation analysis, etc., can solve problems such as unreliable graphite furnace structure and baseline offset, and achieve the effect of avoiding the influence of vibration and optical system
Inactive Publication Date: 2013-04-10
SHANGHAI HUAZHI SPECTRUM INSTR
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[0009] It can be seen from the above discussion that the instrument with alternating magnetic field is more difficult than the instrument with constant magnetic field, because the correction background is turned on and off by the magnetic field. At this time, it is likely due to the effect of Lorentz force (more precisely: Ampere force), During the two times when the magnetic field is turned on and off, due to the movement of the graphite tube, it is not at the same position in the optical path. If the structure of the graphite furnace is unreliable, the possible result is the shift of the baseline
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[0025] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to describe the technical solution of the present invention in detail.
[0026] figure 2 It is a structural schematic diagram of an atomizer and a controlled magnetic field generator; the device includes: an atomizer 3, a controlled magnetic field generator 2 is installed on both sides of the atomizer 3, and the controlled magnetic field generator 2 is connected to A control device 1 that controls the parameters and waveforms of the magnetic field generated by the controlled magnetic field generator 2; the device also includes a heating system 4. In a specific application, the heating system 4 is a DC switching power supply graphite furnace heating power supply, and the graphite furnace The power supply is controlled by the computer system and can be heated according to a certain waveform or intermittently.
[0027] AC Zeeman background correction atomic abs...
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The invention discloses a Lorentz-force-free alternating current Zeeman background correction atomic absorption device and method. The device comprises an atomizer, wherein two sides of the atomizer are equipped with a controlled magnetic field generation device, and the controlled magnetic field generation device is connected with a control device for controlling the controlled magnetic field generation device; the control device controls the parameters of a magnetic field generated by the controlled magnetic field generation device; the device further comprises a direct current switch-type graphite furnace heating power supply which can, under the control of a computer system, realize heating in certain waveform or intermittent heating. According to the invention, the phase-staggered supply of magnetic field current and graphite furnace heating current is adopted in an alternating magnetic field Zeeman background correction system so as to zero ampere force, so the impact from the vibration of a graphite tube and from an optical system is avoided.
Description
technical field [0001] The invention relates to an AC Zeeman background correction atomic absorption device and its method, in particular to an alternating magnetic field Zeeman background correction system, which uses a phase-staggered supply of magnetic field current and graphite furnace heating current to make the Ampere force An atomic absorption apparatus and method for correcting an ac Zeeman background for zero. Background technique [0002] It is well known to those skilled in the art that Zeeman background correction is currently the most complete atomic absorption background correction method, which can accurately correct extremely high background absorption signals, has no spectral interference, and can cover all wavelength ranges used by atomic absorption. [0003] However, when the graphite furnace is heated (whether it is longitudinal heating or transverse heating, whether it is an AC magnetic field or a DC magnetic field), since a large current passes through ...
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IPC IPC(8): G01N21/74
Inventor 杨啸涛陈建钢刘志高滕霖
Owner SHANGHAI HUAZHI SPECTRUM INSTR