Frequency conversion control method of light source of atomic fluorescence spectrometer based on digital micromirror
A digital micromirror and atomic fluorescence technology, applied in the field of atomic fluorescence spectroscopy, can solve the problems of cooperating with atomic fluorescence spectrometers, reducing the stabilization time of hollow cathode lamps, and the long stabilization time of hollow cathode lamps, so as to improve the fluorescence excitation efficiency and reduce the impact , the effect of improving stability
Active Publication Date: 2018-03-27
JILIN UNIV
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[0003] In the prior art, the hollow cathode lamps work at a constant frequency during the acquisition phase, and the hollow cathode lamps are only preheated under a small DC current during the non-acquisition phase. The working efficiency of the instrument; at the same time, due to the addition of digital micromirror components, the previous control method cannot achieve synchronization of acquisition, so it is necessary to invent a frequency conversion control method to improve the stability of the hollow cathode lamp, reduce the stabilization time of the hollow cathode lamp and realize synchronous acquisition. Does not affect the service life of hollow cathode lamps
[0004] So far, there is no frequency conversion control method that uses low-frequency current pulses to light up hollow cathode lamps in the non-acquisition stage, and this method has not been applied to atomic fluorescence spectrometers in conjunction with digital micromirrors.
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[0028] Such as figure 1 As shown, the full-spectrum atomic fluorescence spectrometer based on the digital micromirror array includes an atomizer, a hollow cathode lamp, a grating, a digital micromirror, a photomultiplier tube, a collector, and a host computer. The host computer controls the hollow cathode lamp to light up. Control the flipping of the digital micromirror, and control the work of the collector.
[0029] Such as Figure 2a ~ Figure 2c As shown, a sample detection process includes N acquisition processes, one acquisition process generates one spectrum, and a total of N spectrums are generated. A collection process is divided into collection stages (acquisition time is T 1 ) and non-acquisition phase (non-acquisition time is T 2 ). In the acquisition stage, the high-frequency current (frequency f 1 , the duty cycle is 1:k 1 ) and small DC current I 0 Control the work of the hollow cathode lamp, collect n sampling points; do not sample during the non-collecti...
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The invention relates to a frequency conversion control method for a light source of an atomic fluorescence spectrometer based on a digital micro-mirror. The method includes the steps that at the collecting stage, high-frequency current and small direct current are used for controlling a hollow cathode lamp to work and controlling the digital micro-mirror to overturn at the same time; sampling is carried out in the lightened period of the hollow cathode lamp; at the non-collecting stage, low-frequency current and small direct current are used for controlling the hollow cathode lamp to work. According to the method, as low-frequency pulse current is added on the basis of small current preheating, the stability of the hollow cathode lamp can be improved, stabilization time can be shortened, multiple times of sampling can be carried out within the same time, the working efficiency of the instrument is improved, and the service life of the hollow cathode lamp can be prolonged. The method is suitable for frequency conversion control over a light source of a single-channel atomic fluorescence spectrometer with only one kind of elements capable of being detected at a time and also suitable for frequency conversion control over a light source of a multi-channel atomic fluorescence spectrometer with multiple kinds of elements capable of being detected at a time.
Description
technical field [0001] The invention belongs to the field of atomic fluorescence spectroscopy, and in particular relates to a frequency conversion control method suitable for a hollow cathode lamp of a full-spectrum atomic fluorescence spectrometer based on a digital micromirror array. Background technique [0002] As a new type of atomic fluorescence spectrometer, the full-spectrum atomic fluorescence spectrometer based on digital micromirror array includes the gas system, sample injection system, hydride generation system, atomizer, ignition device, hollow cathode lamp, photomultiplier tube, etc. of the original instrument. , a new dispersion system composed of digital micromirror, dispersion collector, optical path, and photomultiplier tube has been added. The ground-state atoms generated by the atomizer in the above-mentioned spectrometer generate fluorescence under the excitation of specific frequency radiation of the hollow cathode lamp, the grating splits the light, a...
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IPC IPC(8): G01N21/64G01J3/10
CPCG01J3/10G01N21/6404G01N2021/6417
Inventor 田地王宏霞李春生
Owner JILIN UNIV