A deuterium lamp device and an atomic absorption spectroscopy analysis method and system using the same

Abstract

The present application relates to the technical fields of spectral analysis and substance detection, and discloses a deuterium lamp device and an atomic absorption spectral analysis method and system using the deuterium lamp. The system comprises a hollow cathode lamp unit, a built-in hollow cathode lamp emitting a first light beam after preheating under power supply; a first lens, a second lens and a third lens, a deuterium lamp device for emitting a second light beam at a first frequency under the driving of a pulse power supply; a sample cell for internally placing a sample to be measured in a combustion state; a monochromator for performing spectral processing on the incoming first light beam and / or the second light beam, and outputting the spectrally processed light signal to a photoelectric detector; the photoelectric detector for photoelectrically converting the light signal output by the monochromator to obtain an electric signal; and a data processing unit for analyzing and processing the electric signal of the photoelectric detector to obtain an analysis result. The present application can realize more accurate background deduction and improve the accuracy and reliability of atomic absorption spectral measurement.

Description

Technical Field

[0001] This invention relates to the field of spectroscopic analysis and material detection technology, and in particular to a deuterium lamp device and an atomic absorption spectroscopic analysis method and system using a deuterium lamp. Background Technology

[0002] Atomic absorption spectroscopy is an analytical technique used to determine the concentration of a specific element in a sample. It is based on the Lambert absorption principle, which states that atoms absorb light of a specific wavelength when they transition from their ground state to an excited state. By measuring the amount of light absorbed by a sample at a specific wavelength, the concentration of that element in the sample can be determined.

[0003] When using a deuterium lamp and a hollow cathode lamp (HCL lamp) for atomic absorption spectroscopy, the basic steps include: (1) Sample preparation: dissolving or converting the sample to be measured into a form suitable for spectral measurement; (2) Light source selection: selecting a suitable deuterium lamp and / or HCL lamp as the light source to generate a continuous spectrum or a characteristic spectrum; (3) Spectrum generation: the light source emits light of a specific wavelength, and when it passes through the sample, the atoms in the sample absorb the light of that specific wavelength; (4) Spectral measurement: the light emitted by the light source passes through the sample, and a monochromator is used to separate the light transmitted through the sample into specific wavelengths, and the intensity of the light of that specific wavelength is measured; (5) Data processing: recording the relationship between transmittance (the ratio of the intensity of the light transmitted through the sample to the intensity of the incident light) and wavelength, and calculating the concentration of elements in the sample based on the transmittance using the Beer-Lambert Law.

[0004] Background subtraction is an important step in atomic absorption spectroscopy measurements using deuterium lamps and HCl lamps. However, the following problems may exist in actual operation: (1) The matrix, solvent or other coexisting substances in the sample may absorb or scatter light, generating complex background signals that are difficult to accurately subtract; (2) The spectral output of deuterium lamps and HCl lamps may be unstable, leading to fluctuations in the measurement results and affecting the accuracy of background subtraction; (3) Spectral interference: There may be spectral lines of other elements in the sample that overlap with the spectral lines of the target element, resulting in spectral interference and making background subtraction more complicated.

[0005] Background absorption and scattering effects are more pronounced in graphite furnace atomic absorption spectrometry (ETAAS) than in flame atomic absorption spectrometry (FAAS). Currently used background correction methods, such as continuous source methods and pulsed source methods, may not be able to completely and accurately subtract all types of background signals. Summary of the Invention

[0006] The purpose of this invention is to provide a deuterium lamp device and an atomic absorption spectrometry analysis method and system using a deuterium lamp, so as to solve the problem of poor accuracy in background subtraction in atomic absorption spectrometry analysis, achieve more accurate background subtraction, and improve the accuracy and reliability of atomic absorption spectrometry measurement.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] According to one aspect of the present invention, a deuterium lamp device is provided, comprising: a quartz lampshade 1, a pair of discharge electrodes 2, a lamp holder 3, a heat sink 4, a pulse power supply 5, a frequency modulator 6, and a controller 7; wherein:

[0009] The quartz lampshade 1 includes an arc-shaped top 11 and a cylindrical sidewall 12, forming a U-shaped sealed structure; the cylindrical sidewall 12 has a through hollow light-transmitting hole 13 in the middle, and the axis of the light-transmitting hole 13 is collinear with the central axis of the discharge cavity 14 inside the quartz lampshade; the discharge electrodes are symmetrically arranged inside the arc-shaped top (11); the lamp holder 3 is sealed to the bottom of the quartz lampshade 1, and a temperature sensor is embedded inside; the heat sink 4 is sleeved on the outside of the lamp holder 3 and fits against the bottom of the quartz lampshade 1.

[0010] The lamp holder 3 is provided with a slip ring terminal. The pulse power supply 5 and the discharge electrode 2 are electrically connected through the slip ring terminal, and the output frequency is 140 to 150 Hz. The frequency modulator 6 is electrically connected to the pulse power supply 5 and is used to adjust the pulse frequency of the pulse power supply. The controller 7 is electrically connected to the pulse power supply 5, the frequency modulator 6 and the temperature sensor respectively, and controls the preheating of the deuterium lamp, frequency adjustment and overheat protection.

[0011] The inner wall of the light-transmitting through-hole 13 is coated with a silicon dioxide antireflection film.

[0012] According to another aspect of the present invention, an atomic absorption spectrometry analysis system utilizing a deuterium lamp is provided, comprising:

[0013] The hollow cathode lamp unit contains a hollow cathode lamp that emits the first beam after being powered on and preheated.

[0014] The first lens is used to focus and collimate the first beam so that it passes through the light-transmitting aperture 13 of the deuterium lamp device;

[0015] A deuterium lamp device for emitting a second beam of light at a first frequency under the drive of a pulsed power supply;

[0016] The second lens is used to focus the first beam and / or the second beam directly into the sample cell.

[0017] The sample cell is used to house the sample to be tested while it is in a state of combustion.

[0018] The third lens is used to focus the first beam and / or the second beam passing through the sample cell onto the entrance aperture of the monochromator;

[0019] A monochromator is used to split the incoming first beam and / or second beam and output the split optical signal to a photodetector.

[0020] A photodetector is used to convert the optical signal output by a monochromator into an electrical signal through photoelectric conversion.

[0021] The data processing unit is used to analyze and process the electrical signals of the photodetector to obtain analysis results.

[0022] According to one embodiment of the present invention, the hollow cathode lamp unit includes a drive motor, a lamp assembly turntable, and a plurality of hollow cathode lamps. The plurality of hollow cathode lamps are evenly distributed around the mounting position. The drive motor is configured at the center of the lamp assembly turntable to drive the lamp assembly turntable to rotate and replace the hollow cathode lamps in the optical path.

[0023] The lamp assembly turntable is also equipped with a photoelectric positioning sensor, which triggers a signal through a positioning pin to ensure that the coaxiality error between the first beam emitted after the hollow cathode lamp is switched and the light-transmitting aperture 13 of the deuterium lamp is ≤0.05mm.

[0024] According to one embodiment of the present invention, the first lens and the third lens are quartz plano-convex lenses, and the second lens is an achromatic quartz lens.

[0025] According to another aspect of the present invention, an atomic absorption spectrometry analysis method using a deuterium lamp is provided, based on the aforementioned system, comprising the following steps:

[0026] S1: System preheating and calibration: The controller starts the deuterium lamp preheating and the hollow cathode lamp preheating, and the monochromator wavelength and slit width are calibrated using standard samples;

[0027] S2: The sample to be tested is atomized, introduced into the sample cell, and the flame is ignited;

[0028] S3: Control the hollow cathode lamp and deuterium lamp to alternately light up in real time according to the first frequency, and perform three-stage measurements in each alternation cycle, specifically including:

[0029] In the first stage, only the first photoelectric signal after the first beam passes through the sample is measured to obtain the characteristic absorbance. ;

[0030] In the second stage, only the second photoelectric signal after the second beam passes through the sample is measured to obtain the background absorbance. ;

[0031] In the third stage, only the third photoelectric signal, for which no beam of light passes through the sample, is measured to obtain the detector background. ;

[0032] S4: Within each alternation period corresponding to the first frequency, the net absorbance signal obtained after eliminating background interference is calculated as follows: .

[0033] According to an embodiment of the present invention, the method further includes S5: averaging the net absorbance signal obtained by multiple pulse period measurements performed at a first frequency, and using the average value as the final measurement result.

[0034] According to an embodiment of the present invention, the method further includes: before the signal measurement in step S3, confirming that the hollow cathode lamp beam is coaxial with the light-transmitting aperture of the deuterium lamp by a photoelectric positioning sensor; if the coaxiality error is >0.05mm, the position of the single hollow cathode lamp or the lamp group turntable corresponding to the hollow cathode lamp needs to be adjusted.

[0035] According to an embodiment of the present invention, step S4 further includes: combining internal standard correction for matrix effect and substituting into the standard curve to obtain sample concentration; wherein, the internal standard correction adopts the signal ratio method: calculating the absorbance ratio of the target element and the internal standard element to eliminate injection volume fluctuation error.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] 1. By opening a light-transmitting hole in the U-shaped quartz lampshade, the beam of the hollow cathode lamp and the beam of the deuterium lamp can be configured to overlap in the same optical path, reducing the offset error of the traditional split optical path.

[0038] 2. Using a lamp group turntable can realize the preheating and switching of multiple lamp groups, which can improve measurement efficiency.

[0039] 3. By using two-stage atomization for the sample, the atomization efficiency can be improved and the droplet diameter of the sample to be tested can be reduced, thereby improving the combustion efficiency.

[0040] 4. By configuring the beam overlap adjustment, it can be ensured that the first beam and the second beam can achieve a better common optical path and be fully absorbed by the sample to be tested, thereby improving the detection accuracy.

[0041] 5. By using high-frequency measurement and measuring in three stages within each measurement cycle, the background subtraction effect can be enhanced, thereby improving the measurement accuracy. Attached Figure Description

[0042] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0043] Figure 1 This is a schematic diagram of the deuterium lamp device according to an embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of an atomic absorption spectrometry analysis system using a deuterium lamp according to an embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of an atomic absorption spectrometry analysis system using an HCl lamp group according to an embodiment of the present invention;

[0046] Figure 4 This is a flowchart of the atomic absorption spectrometry analysis method using a deuterium lamp according to an embodiment of the present invention.

[0047] Explanation of reference numerals in the attached figures

[0048] 1. Quartz lampshade; 2. Discharge electrode; 3. Lamp holder; 4. Heat sink; 5. Pulse power supply; 6. Frequency modulator; 7. Controller; 11. Arc-shaped top; 12. Cylindrical sidewall; 13. Light-transmitting aperture; 14. Discharge cavity inside the quartz lampshade; 21. Hollow cathode lamp unit; 22. First lens; 23. Deuterium lamp device; 24. Second lens; 25. Sample cell; 26. Third lens; 27. Monochromator; 28. Photodetector; 29. ​​Data processing unit. Detailed Implementation

[0049] To facilitate a clear description of the technical solutions in the embodiments of the present invention, the terms "first" and "second" are used to distinguish identical or similar items with essentially the same function and effect. For example, the first threshold and the second threshold are merely used to distinguish different thresholds and do not limit their order. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that the terms "first" and "second" are not necessarily different.

[0050] It should be noted that in this invention, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0051] In this invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, "at least one of a, b, or c" can represent: a, b, c, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple.

[0052] Traditional measurement methods use a hollow cathode lamp as the measuring beam to determine the total absorbance (atomic absorption + background absorption), while simultaneously using a split beam that does not pass through the atomizer to measure the background absorbance. The atomic absorption signal is obtained by subtracting the two. Atomic absorption spectrophotometer systems are typically equipped with automatic calibration devices using continuous light sources such as deuterium lamps or tungsten iodine lamps. Deuterium lamps are suitable for background subtraction in the ultraviolet region. The continuous spectral width emitted by a deuterium lamp is approximately one hundred times the width of the atomic absorption line, and its contribution to the atomic absorption signal is less than 0.5%. Therefore, the deuterium lamp measurement value can be considered as pure background absorption. Currently used background correction methods, such as continuous light source methods and pulsed light source methods, may not be able to completely and accurately subtract all types of background signals.

[0053] like Figure 1 The diagram shows a schematic of a deuterium lamp device. The device includes: a quartz lampshade 1, a pair of discharge electrodes 2, a lamp holder 3, a heat sink 4, a pulse power supply 5, a frequency modulator 6, and a controller 7. The quartz lampshade 1 comprises an arc-shaped top 11 and cylindrical sidewalls 12, forming a U-shaped sealed structure. A through-hole 13 is provided in the center of the cylindrical sidewalls 12, and the axis of the through-hole 13 is collinear with the central axis of the discharge cavity 14 inside the quartz lampshade. The discharge electrodes are symmetrically arranged inside the arc-shaped top 11. The lamp holder 3 is sealed to the bottom of the quartz lampshade 1 and has a temperature sensor embedded inside. The heat sink 4 is fitted onto the outside of the lamp holder 3 and is attached to the bottom of the quartz lampshade 1. The inner wall of the through-hole 13 is coated with a silica antireflective film.

[0054] The pulse power supply 5 is electrically connected to the discharge electrode 2; the frequency modulator 6 is electrically connected to the pulse power supply 5 and is used to adjust the pulse frequency of the pulse power supply; the controller 7 is electrically connected to the pulse power supply 5, the frequency modulator 6, and the temperature sensor respectively, and controls the preheating, frequency adjustment, and overheat protection of the deuterium lamp. The lamp holder 3 is provided with a slip ring terminal, and the pulse power supply 5 and the discharge electrode 2 are electrically connected through the slip ring terminal, with an output frequency of 140 to 150 Hz.

[0055] The light-transmitting aperture 13 can be circular, square, or elliptical. When the light-transmitting aperture 13 is circular, its diameter is 2-3 mm, and its inner wall is coated with a 100-150 nm thick silicon dioxide antireflection film. The discharge electrodes are symmetrically arranged on the inner side of the arc-shaped top, with a spacing of 1-1.5 mm.

[0056] The lamp holder is made of high-temperature resistant ceramic material and is sealed to the bottom of the quartz lampshade with fluororubber. The temperature sensor embedded inside has a detection range of 0℃-100℃.

[0057] like Figure 2 As shown, the atomic absorption spectrometry analysis system utilizing a deuterium lamp, implemented using the aforementioned deuterium lamp device, includes:

[0058] Hollow cathode lamp unit 21, which has a built-in hollow cathode lamp that emits the first beam after being powered on and preheated;

[0059] The first lens 22 is used to focus and collimate the first beam so that it passes through the light-transmitting aperture of the deuterium lamp device;

[0060] The deuterium lamp device 23 is used to emit a second beam at a first frequency under the drive of a pulsed power supply;

[0061] The second lens 24 is used to focus the first beam and / or the second beam directly into the sample cell;

[0062] Sample cell 25 is used to house the test sample in a combustion state;

[0063] The third lens 26 is used to focus the first beam and / or the second beam passing through the sample cell onto the entrance aperture of the monochromator;

[0064] Monochromator 27 is used to perform spectral splitting on the incoming first beam and / or second beam, decomposing the incident light into a spectrum arranged according to wavelength, and finally outputting the split optical signal to the photodetector.

[0065] The photodetector 28 is used to convert the optical signal output from the monochromator into an electrical signal through photoelectric conversion, and is preferably a photomultiplier tube or a charge-coupled device. The photodetector 28 is placed in a metal shielded chamber to shield electromagnetic signals and prevent interference.

[0066] The data processing unit 29 is used to analyze and process the electrical signal of the photodetector to obtain the analysis results.

[0067] The sample cell 25 has a two-stage atomizer for sample atomization. The atomized sample is mixed with fuel in the mixing chamber for subsequent atomization of elements in the flame. For flame atomization, acetylene / air and acetylene / nitrosyl are used to achieve optimal efficiency for elements requiring different atomization temperatures.

[0068] The system includes multiple adjustment mechanisms arranged along the optical path to support components 21 to 27 located on the optical path. These mechanisms are used to make minor adjustments to the various components on the optical path. The adjustment mechanisms are piezoelectric ceramic drivers or stepper motor adjustment frames. The system also includes a spot detection module, which is a quadrant detector or a CCD beam analyzer. This module is used to adjust the spots of the first and second beams emitted by the hollow cathode lamp and deuterium lamp before measurement begins, ensuring that the spots overlap.

[0069] like Figure 3 As shown, the hollow cathode lamp unit includes a drive motor, a lamp assembly turntable, and multiple hollow cathode lamps. These lamps are evenly distributed circumferentially on the mounting positions of the turntable. The drive motor is positioned at the center of the turntable and drives its rotation to replace the hollow cathode lamps in the optical path. To ensure that the beams of the hollow cathode lamps and the deuterium lamp are strictly aligned, the turntable is also equipped with a photoelectric positioning sensor. A trigger signal via a positioning pin ensures that the coaxiality error between the first beam emitted after the hollow cathode lamp switching and the light-transmitting aperture 13 of the deuterium lamp is ≤0.05mm. The first beam and the second beam share the same optical path. In practice, the drive motor rotates the turntable. When the positioning pin blocks the infrared light from the photoelectric sensor, the receiver generates a trigger signal, and the controller stops the drive motor, ensuring that the target lamp and the light-transmitting aperture 13 are coaxial.

[0070] The first and third lenses are quartz plano-convex lenses, and the second lens is an achromatic quartz lens.

[0071] like Figure 4 As shown, the atomic absorption spectrometry analysis method using a deuterium lamp based on the aforementioned analysis system includes the following steps:

[0072] S1: System preheating and calibration: The controller starts the deuterium lamp preheating and the hollow cathode lamp preheating, and the monochromator wavelength and slit width are calibrated using standard samples;

[0073] S2: The sample to be tested is atomized, introduced into the sample cell, and the flame is ignited;

[0074] S3: Control the hollow cathode lamp and deuterium lamp to alternately light up in real time according to the first frequency, and perform three-stage measurements in each alternation cycle, specifically including:

[0075] In the first stage, only the first photoelectric signal after the first beam passes through the sample is measured to obtain the characteristic absorbance. ;

[0076] At this stage, the main measurement is of the signal affected by the presence of the analyte; after the first beam emitted by the hollow cathode lamp passes through the sample in the sample cell, the detector receives the following signal:

[0077] ;

[0078] In the second stage, only the second photoelectric signal after the second beam passes through the sample is measured to obtain the background absorbance. ;

[0079] During this stage, the primary measurement is of non-specific signals from the background; the deuterium lamp, driven by a pulsed power supply, emits continuous ultraviolet light in the range of 190 to 350 nm, the spectral width of which is much larger than the atomic absorption linewidth. Since the absorption of continuous light by atoms is negligible and constitutes only a very small portion of the background, the signal received by the detector is mainly:

[0080] In the third stage, only the third photoelectric signal, for which no beam of light passes through the sample, is measured to obtain the detector background. .

[0081] During this phase, both the hollow cathode lamp and the deuterium lamp are turned off, and the detector only measures its own dark current / noise to obtain the detector background. .

[0082] The first frequency ranges from 100 to 200 Hz, and preferably from 140 to 150 Hz.

[0083] In this embodiment of the invention, the first frequency can be set to 142 Hz, which means that 142 three-stage measurement processes are completed per second. Therefore, the signal changes of the sample under test during the atomization process can be dynamically tracked, which can adapt to scenarios that require rapid analysis, such as when it is necessary to measure the transient signal of flame atomization.

[0084] S4: Within each alternation cycle corresponding to the first frequency, the net absorbance signal obtained after eliminating background interference is calculated based on the measurement data as follows: In this formula, the numerator represents the total effective signal of atomic absorption and background absorption after subtracting the detector background, and the denominator represents the effective signal of background absorption after subtracting the detector background. The logarithm of the ratio of the numerator and denominator represents the absorbance contributed solely by atomic absorption, at which point the background is completely subtracted. Using a three-stage measurement method ensures that atomic signal acquisition, background signal acquisition, and background subtraction are completed synchronously in each measurement cycle, effectively eliminating complex background interference in atomic absorption spectroscopy analysis.

[0085] S5: Average the net absorbance signal obtained from multiple pulse cycles measured at the first frequency, and use the average value as the final measurement result. By averaging the measurement results through high-frequency pulse measurement, random noise can be effectively suppressed and signal stability improved.

[0086] Before the signal measurement in step S3, the photoelectric positioning sensor is used to confirm that the hollow cathode lamp beam is coaxial with the light-transmitting hole of the deuterium lamp. If the coaxiality error is >0.05mm, the position of the turntable of a single hollow cathode lamp or the lamp group corresponding to the hollow cathode lamp needs to be adjusted.

[0087] Step S4 further includes: combining internal standard correction for matrix effects and substituting into the standard curve to obtain the sample concentration; wherein, the internal standard correction adopts the signal ratio method: calculating the absorbance ratio of the target element and the internal standard element to eliminate injection volume fluctuation error.

[0088] Since hollow cathode lamps require preheating, multiple hollow cathode lamps can be used to form a lamp assembly turntable to improve efficiency. For example, multiple hollow cathode lamps can be arranged on the turntable, and each lamp can switch to its measurement position as the turntable rotates. While one hollow cathode lamp is measuring, the other hollow cathode lamps are powered on to preheat. When the preheated hollow cathode lamp switches to the measurement position, it can immediately emit light for measurement, reducing preheating waiting time and improving measurement efficiency.

[0089] Although the invention has been described herein in conjunction with various embodiments, those skilled in the art will understand and implement other variations of the disclosed embodiments by reviewing the accompanying drawings, disclosure, and other materials. In this specification, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude multiple components. A single processor or other unit can implement several functions listed in the specification. While certain measures are described in different embodiments, this does not mean that these measures cannot be combined to produce good results.

[0090] Although the invention has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made therein without departing from the spirit and scope of the invention. Accordingly, this specification and drawings are merely illustrative of the invention and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. Clearly, those skilled in the art can make various alterations and modifications to the invention without departing from its spirit and scope. Thus, if such modifications and modifications fall within the scope of the invention and its equivalents, the invention is also intended to include such modifications and modifications.

Claims

1. A deuterium lamp device, characterized in that, include: The components include: a quartz lampshade (1), a pair of discharge electrodes (2), a lamp holder (3), a heat sink (4), a pulse power supply (5), a frequency modulator (6), and a controller (7); among which: The quartz lampshade (1) includes an arc-shaped top (11) and a cylindrical sidewall (12), forming a U-shaped sealed structure; the cylindrical sidewall (12) has a through hollow light-transmitting hole (13) in the middle, and the axis of the light-transmitting hole (13) is collinear with the central axis of the discharge cavity (14) inside the quartz lampshade (1); the discharge electrodes (2) are symmetrically arranged inside the arc-shaped top (11); the lamp holder (3) is sealed to the bottom of the quartz lampshade (1), and a temperature sensor is embedded inside; the heat sink (4) is sleeved on the outside of the lamp holder (3) and fits against the bottom of the quartz lampshade (1); The lamp holder (3) is provided with a slip ring terminal. The pulse power supply (5) and the discharge electrode (2) are electrically connected through the slip ring terminal, and the output frequency is 140 to 150 Hz. The frequency modulator (6) is electrically connected to the pulse power supply (5) and is used to adjust the pulse frequency of the pulse power supply (5). The controller (7) is electrically connected to the pulse power supply (5), the frequency modulator (6), and the temperature sensor respectively, and controls the preheating of the deuterium lamp, frequency adjustment, and overheat protection.

2. The deuterium lamp device according to claim 1, characterized in that, The inner wall of the light-transmitting through-hole (13) is coated with a silicon dioxide anti-reflection film.

3. An atomic absorption spectrometry analysis system utilizing a deuterium lamp, implemented based on the deuterium lamp device according to any one of claims 1 to 2, characterized in that, include: The hollow cathode lamp unit (21) has a built-in hollow cathode lamp that emits the first beam after being powered on and preheated. The first lens (22) is used to focus and collimate the first beam and make it pass through the light-transmitting hole (13) of the deuterium lamp device (23). A deuterium lamp device (23) is used to emit a second beam at a first frequency under the drive of a pulse power supply (5); The second lens (24) is used to focus the first beam and / or the second beam directly into the sample cell (25). Sample cell (25) is used to house the sample to be tested in a burning state; The third lens (26) is used to focus the first beam and / or the second beam passing through the sample cell (25) onto the entrance aperture of the monochromator (27); Monochromator (27) is used to perform spectral splitting on the incoming first beam and / or second beam, and output the split optical signal to photodetector (28). A photodetector (28) is used to perform photoelectric conversion on the optical signal output by the monochromator (27) to obtain an electrical signal; The data processing unit (29) is used to analyze and process the electrical signal of the photodetector (28) to obtain the analysis results; The hollow cathode lamp unit (21) includes a drive motor, a lamp group turntable, and multiple hollow cathode lamps. The multiple hollow cathode lamps are evenly distributed around the mounting position. The drive motor is configured at the center of the lamp group turntable to drive the lamp group turntable to rotate and replace the hollow cathode lamps in the optical path.

4. The atomic absorption spectrometry analysis system using a deuterium lamp according to claim 3, characterized in that, The lamp set turntable is also equipped with a photoelectric positioning sensor, which triggers a signal through the positioning pin to ensure that the first beam emitted after the hollow cathode lamp is switched and the coaxiality error of the light-transmitting hole (13) of the deuterium lamp is ≤0.05mm.

5. The atomic absorption spectrometry system using a deuterium lamp according to claim 3, characterized in that, The first lens (22) and the third lens (26) are quartz plano-convex lenses, and the second lens (24) is an achromatic quartz lens.

6. An atomic absorption spectrometry method using a deuterium lamp, implemented based on the system described in any one of claims 3 to 5, characterized in that, Includes the following steps: S1: System preheating and calibration: The controller (7) starts the preheating of the deuterium lamp and the hollow cathode lamp, and uses the standard sample to calibrate the wavelength and slit width of the monochromator (27); S2: After atomizing the sample to be tested, introduce it into the sample cell (25) and ignite the flame; S3: Control the hollow cathode lamp and deuterium lamp to alternately light up in real time according to the first frequency, and perform three-stage measurements in each alternation cycle, specifically including: In the first stage, only the first photoelectric signal after the first beam passes through the sample is measured to obtain the characteristic absorbance. ; In the second stage, only the second photoelectric signal after the second beam passes through the sample is measured to obtain the background absorbance. ; In the third stage, only the third photoelectric signal without a beam passing through the sample is measured to obtain the background of the photodetector (28). ; S4: Within each alternation period corresponding to the first frequency, the net absorbance signal obtained after eliminating background interference is calculated as follows: .

7. The atomic absorption spectrometry method using a deuterium lamp according to claim 6, characterized in that, The method further includes S5: averaging the net absorbance signal obtained from multiple pulse cycle measurements performed at a first frequency, and using the average value as the final measurement result.

8. The atomic absorption spectrometry method using a deuterium lamp according to claim 6, characterized in that, The method further includes: before the signal measurement in step S3, confirming that the hollow cathode lamp beam is coaxial with the light-transmitting hole (13) of the deuterium lamp by using a photoelectric positioning sensor. If the coaxiality error is >0.05mm, the position of the single hollow cathode lamp or the lamp group turntable corresponding to the hollow cathode lamp needs to be adjusted.

9. The atomic absorption spectrometry method using a deuterium lamp according to claim 6, characterized in that, Step S4 further includes: combining internal standard correction for matrix effects and substituting into the standard curve to obtain the sample concentration; wherein, the internal standard correction adopts the signal ratio method: calculating the absorbance ratio of the target element and the internal standard element to eliminate the injection volume fluctuation error.

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