Solid sample detection aiming device for laser-induced breakdown spectroscopy

Abstract

The utility model discloses a solid sample detection aiming device for a laser-induced breakdown spectroscopy technology, which belongs to the technical field of spectral analysis detection and comprises an aiming device base and a front-end display screen, and the front-end display screen is in circuit connection with the front end of the aiming device base. A laser aiming module is connected to the upper end of the left side of the aiming device base, and a spectral signal receiving module is arranged at the upper end of the center of the aiming device base; according to the utility model, the laser aiming module and the spectral signal receiving module are matched to detect a solid sample by utilizing the laser-induced breakdown spectroscopy technology, and the device has the advantages of simultaneous identification of multiple elements, multidirectional plasma spectral data acquisition, reduction of poor repeatability of the LIBS technology, and enhancement of the intensity of an emission spectral signal.

Description

Technical Field

[0001] The utility model belongs to the technical field of spectrum analysis and detection, and in particular relates to a solid sample detection and aiming device used in laser induced breakdown spectroscopy technology. Background Art

[0002] LIBS (Laser Induced Breakdown Spectroscopy) is a new spectral analysis method for trace element analysis. It uses high-energy pulsed laser light from a laser, focused through a lens onto the surface of the sample to be tested. The laser excites the sample to produce a high-temperature, high-pressure, electron-dense plasma. As the plasma expands and gradually cools, it radiates a characteristic spectrum unique to the sample. This spectrum is transmitted via optical fiber to a spectrometer, where it is converted into intensity information and displayed on a computer. Finally, through manual or computer-aided qualitative and quantitative analysis and calculation, the types and concentrations of elements in the sample can be determined.

[0003] The fundamental principle of LIBS technology is that a high-energy pulsed laser is focused on the surface of the sample to be measured, ablating and generating plasma. Therefore, accurately focusing the pulsed laser onto the surface of a solid sample is a pressing challenge. This is particularly true when using LIBS for solid sample analysis. Specifically, uneven sample surfaces can make it difficult to visually verify the laser's accurate focus. Furthermore, the LIBS mechanism results in poor detection repeatability. Factors such as unstable laser flux and matrix effects can cause fluctuations in the spectral signal, affecting the correlation between the amount of laser ablation and spectral intensity. Therefore, controlling the laser incident direction and the direction of spectral signal acquisition is crucial in LIBS experiments. Adjusting the direction of the pulsed laser incident and the direction of plasma spectral signal acquisition can generate multiple sets of sample data. Spectral data processing, through manual or computer-aided qualitative and quantitative analysis and calculation, can improve the accuracy of element identification and elemental content within the sample.

[0004] Laser-induced breakdown spectroscopy (LIBS) uses ultrashort laser pulses to form a plasma on the sample surface, and then analyzes the plasma's emission spectrum to determine the sample's composition and content. The high energy density of focused ultrashort laser pulses allows the formation of plasma in samples of any physical state (solid, liquid, or gas). LIBS can (in principle) analyze any sample, limited only by the laser power and the sensitivity and wavelength range of the spectrometer detector. Furthermore, nearly all elements emit characteristic spectral lines when excited into plasma, making LIBS suitable for analyzing most elements. If the composition of the material being analyzed is known, LIBS can be used to estimate the relative abundance of each constituent element or monitor the presence of impurities. In practice, the detection limit is a function of: a) the plasma excitation temperature, b) the light collection window, and c) the intensity of the observed elemental spectral lines. LIBS utilizes plasma emission spectroscopy, which is very similar to arc / spark emission spectroscopy. However, general detection and aiming equipment mostly uses a single tube and a single direction for collection, which is not accurate enough, has a narrow collection area, and is inefficient. In addition, the laser aiming module is relatively fixed and cannot be adjusted to excite multiple points.

[0005] In the publication number CN205620303U, a clamping device for laser-induced breakdown spectroscopy detection of solid samples belongs to the field of spectral analysis and detection equipment. Its technical solution is: the sample can be placed between the front panel and the rear panel of the utility model and fastened with a top screw, and the base can be fixed to a translation stage or an optical platform for the horizontal excitation light path of the laser-induced breakdown spectroscopy, or the rear panel can be fixed to a translation stage or an optical platform for the vertical excitation light path of the laser-induced breakdown spectroscopy. The utility model has a simple structure and is easy to use. It can be used for horizontal light paths as well as vertical light paths. It is easy and fast to install, and has high practicality, integration and versatility. It greatly shortens the experimental preparation time, can accurately fix the excitation surface of solid samples of various shapes, ensure the consistency of the power density of the excitation in each experiment, improve the calibration accuracy of samples in the same series, the accuracy and stability of spectral detection, and ensure that the sample stage will not move during the experiment.

[0006] However, the above-mentioned detection and aiming equipment uses a single tube and a single direction for collection, which has insufficient accuracy, a narrow collection area, and low efficiency. In addition, the laser aiming module is relatively fixed and cannot be adjusted to multiple points for excitation. Therefore, there is an urgent need to provide a solid sample detection and aiming device for laser induced breakdown spectroscopy technology that is more in line with the needs of detection and aiming, more accurate, can be excited in multiple directions, and has higher efficiency. Utility Model Content

[0007] In order to solve the problems in the prior art that the detection and aiming equipment has low precision, narrow collection area, low efficiency, and the laser aiming module is relatively fixed and cannot be adjusted to excite multiple points, the utility model proposes a solid sample detection and aiming device for laser induced breakdown spectroscopy technology.

[0008] To achieve the above objectives, the present invention provides the following technical solutions: a solid sample detection aiming device for laser-induced breakdown spectroscopy technology, comprising: an aiming device base and a front-end display screen, wherein the front-end display screen circuit is connected to the front end of the aiming device base, a laser aiming module is connected to the upper left end of the aiming device base, and a spectrum signal receiving module is provided at the upper center end of the aiming device base;

[0009] The aiming device base includes a base body, which is fixedly arranged on the rear side of the front display screen, so that the aiming device base and the front display screen are firmly connected, providing conditions for the front display screen to display the analysis results later;

[0010] The laser aiming module includes a connecting support rod, which is fixedly arranged on the left side of the upper end of the aiming device base to firmly fix the laser aiming module and the front display screen, providing a solid foundation for the subsequent use of the laser aiming module;

[0011] The spectral signal receiving module includes a bottom lifting column sleeve, which is fixedly arranged at the center of the upper end of the aiming device base, allowing the spectral signal receiving module and the aiming device base to be combined in an orderly manner, providing a good foundation for the realization of various functions of the spectral signal receiving module.

[0012] As a further solution of the present invention, a power transmission box is provided inside the left side of the base body, a signal analysis box is provided inside the right side of the base body, and a power switch is provided on the rear side of the base body, so that the precision equipment can be protected while playing its original role, allowing the power transmission box and the signal analysis box to provide the basis for the functional realization of the laser aiming module and the spectral signal receiving module.

[0013] As a further solution of the present invention, a cavity is provided inside the base body for cooperating with the energy transmission box and the signal analysis box, a groove is provided at the upper end of the base body for cooperating with the laser aiming module and the spectrum signal receiving module, and circuit channels for connecting various devices are provided inside the base body, which provide necessary conditions for the operation of various modules of the device, including the front display screen, laser aiming module, spectrum signal receiving module, etc., and also provide conditions for the coordination between the functions of the laser aiming module and the spectrum signal receiving module, so that the above functional structure can operate well on the bottom fixed base plate.

[0014] As a further solution of the present invention, the upper end of the connecting support rod is rotatably connected to the second light guide arm through the first light guide arm, a third light guide arm is provided at the bottom of the second light guide arm, and the bottom of the third light guide arm is rotatably connected to a photomultiplier tube, so that the device can be aimed at the same time, and through the coordinated use of the first light guide arm and the second light guide arm, the device can be height adjusted, and through the coordinated use of the third light guide arm and the photomultiplier tube, the device can be rotated at an angle.

[0015] As a further solution of the present invention, energy transmission channels are provided inside the connecting support rod, the first light guide arm and the second light guide arm, so that the device can be adjusted without affecting its energy transmission.

[0016] As a further solution of the present invention, the shape of the photomultiplier tube is similar to a right-angle C-type. The bottom of the photomultiplier tube is aligned with the center of the spectral signal receiving module, so that the device can accurately aim at the object to be detected and can be adjusted 360 degrees.

[0017] As a further solution of the present invention, the bottom lifting column is sleeved with a bottom lifting column, the outer side of the upper end of the bottom lifting column is ring-connected with a connecting circular plate, the outer side of the connecting circular plate is ring-connected with an outer ring plate, a passive adjustment gear is provided on the outer side of the outer ring plate, the passive adjustment gear is meshed with an active adjustment gear, a control knob is provided inside the active adjustment gear, the upper end of the outer ring plate is connected to an upper isolation ring column, and four groups of collecting heads are provided on the inner side of the upper isolation ring column, so that the device can be raised and lowered through the cooperation between the bottom lifting column sleeve and the bottom lifting column, and the device can rotate the upper isolation ring column to a certain extent through the cooperation between the passive adjustment gear and the active adjustment gear to achieve a suitable collection angle.

[0018] As a further solution of the present invention, a signal connection channel that cooperates with the collecting head is opened inside the upper isolation ring column, a signal connection channel is opened inside the outer ring plate, and a signal connection channel that cooperates with the collecting head is opened at the upper end of the aiming device base, so that the adjustment function of the spectral signal receiving module can be operated on the aiming device base, providing a basis for the function realization.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. This utility model is a solid sample detection and aiming device for laser-induced breakdown spectroscopy technology. Through the cooperation of a laser aiming module and a spectral signal receiving module, laser-induced breakdown spectroscopy technology is used to detect solid samples. It has the advantages of simultaneous multi-element identification, multi-directional plasma spectrum data acquisition, reducing the poor repeatability of LIBS technology, and enhancing the intensity of emission spectrum signals.

[0021] 2. The utility model is a solid sample detection and aiming device for laser-induced breakdown spectroscopy technology. It adopts a two-dimensional structural design to enable the pulsed laser to be accurately focused on the surface of the solid sample, greatly increasing the hit rate and efficiency of the pulsed laser acting on the sample surface. At the same time, it can also excite from different points of the sample and collect spectral data from different directions of the plasma, greatly reducing the problem of poor repeatability of the LIBS technology, enhancing the intensity of the emission spectrum signal, and improving the collection efficiency of the plasma spectrum signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of the left side of a solid sample detection and aiming device for laser induced breakdown spectroscopy technology in the utility model;

[0023] Figure 2 This is a schematic diagram of the overall structure of the right side of a solid sample detection and aiming device for laser induced breakdown spectroscopy technology in the utility model;

[0024] Figure 3 This is a schematic diagram of the cross-sectional structure of the base body of a solid sample detection and aiming device for laser-induced breakdown spectroscopy technology according to the present invention;

[0025] Figure 4 This is a schematic structural diagram of a laser aiming module of a solid sample detection aiming device for laser induced breakdown spectroscopy technology according to the present invention;

[0026] Figure 5 This is a schematic structural diagram of a spectrum signal receiving module of a solid sample detection and aiming device for laser induced breakdown spectroscopy technology in the utility model;

[0027] Figure 6 The utility model is a schematic diagram of the cross-sectional structure of a spectrum signal receiving module of a solid sample detection and aiming device used in laser induced breakdown spectroscopy technology.

[0028] In the figure: 1. Aiming device base; 11. Base body; 12. Energy transmission box; 13. Signal analysis box; 2. Front display screen; 3. Laser aiming module; 31. Connecting support rod; 32. First light guide arm; 33. Second light guide arm; 34. Third light guide arm; 35. Photomultiplier tube; 4. Spectral signal receiving module; 41. Bottom lifting column sleeve; 42. Bottom lifting column; 43. Connecting ring plate; 44. Outer ring plate; 45. Passive adjustment gear; 46. Active adjustment gear; 47. Control knob; 48. Upper isolation ring column; 49. Collecting head. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 A solid sample detection aiming device for laser-induced breakdown spectroscopy technology includes: an aiming device base 1 and a front display screen 2, wherein the front display screen 2 is connected to the front end of the aiming device base 1, a laser aiming module 3 is connected to the upper left end of the aiming device base 1, and a spectrum signal receiving module 4 is provided at the upper center end of the aiming device base 1;

[0031] The aiming device base 1 includes a base body 11, which is fixedly arranged on the rear side of the front display screen 2, so that the aiming device base 1 and the front display screen 2 are firmly connected, providing conditions for the front display screen 2 to display the analysis results later;

[0032] The laser aiming module 3 includes a connecting support rod 31, which is fixedly arranged on the upper left side of the aiming device base 1, so that the laser aiming module 3 and the front display screen 2 are firmly fixed, providing a solid foundation for the subsequent use of the laser aiming module 3;

[0033] The spectral signal receiving module 4 includes a bottom lifting column sleeve 41, which is fixedly arranged at the center of the upper end of the aiming device base 1, allowing the spectral signal receiving module 4 and the aiming device base 1 to be combined in an orderly manner, providing a good foundation for the realization of various functions of the spectral signal receiving module 4.

[0034] Example 1:

[0035] Please refer to Figures 1 to 4It can be seen that in order to allow the device to provide the basic conditions for the realization of various functions, a power transmission box 12 is set inside the left side of the base body 11, and a signal analysis box 13 is set inside the right side of the base body 11. A power switch is set on the back side of the base body 11, so that the precision equipment can be protected while playing its original role, so that the power transmission box 12 and the signal analysis box 13 provide the basis for the function realization of the laser aiming module 3 and the spectrum signal receiving module 4. A cavity is opened inside the base body 11 for the power transmission box 12 and the signal analysis box 13 to cooperate with each other, and a groove is opened at the upper end of the base body 11 for the laser aiming module 3 and the spectrum signal receiving module 4 to cooperate with each other. Circuit channels for connecting various devices are opened inside the base body 11, which provide necessary conditions for the operation of various modules of the device, including the front display screen 2, the laser aiming module 3, the spectrum signal receiving module 4, etc., and also provide conditions for the cooperation between the functions of the laser aiming module 3 and the spectrum signal receiving module 4, so that the above functional structure can operate well on the bottom fixed base plate.

[0036] In order to allow the device to be adjusted to a certain extent and better assist the device in aiming and achieving the laser excitation effect, the upper end of the connecting support rod 31 is rotatably connected to the second light guide arm 33 through the first light guide arm 32, and a third light guide arm 34 is provided at the bottom of the second light guide arm 33. The bottom of the third light guide arm 34 is rotatably connected to the photomultiplier tube 35, so that the device can be aimed at the same time. Through the coordinated use of the first light guide arm 32 and the second light guide arm 33, the device can be height adjusted. Through the coordinated use of the third light guide arm 34 and the photomultiplier tube 35, the device can be rotated at an angle. The connecting support rod 31, the first light guide arm 32, and the second light guide arm 33 are internally provided with energy transmission channels, so that the device can be adjusted without affecting its energy transmission. The shape of the photomultiplier tube 35 is similar to that of a right-angle C-type photomultiplier tube 35. The bottom of the photomultiplier tube 35 is aligned with the center of the spectral signal receiving module 4, so that the device can accurately aim at the object to be detected and can be adjusted 360 degrees.

[0037] The laser aiming module 3 is composed of two cross-groups of scattered lasers and photomultiplier tubes 35. The laser light generated by the scattered laser passes through the surface of the solid sample and is received by the photomultiplier tube 35. The intersection of the light paths of the generated laser light serves as the inspection point.

[0038] The laser excitation module focuses on the intersection of the light paths of the two groups of scattered lasers in the laser aiming module 3 to generate plasma in the solid sample.

[0039] Example 2:

[0040] Please refer to Figure 2 、 Figure 5 and Figure 6, it can be seen that in order to allow the device to collect spectral data in multiple channels and in multiple directions, the bottom lifting column sleeve 41 is internally sleeved with a bottom lifting column 42, the outer side of the upper end of the bottom lifting column 42 is ring-connected with a connecting circular plate 43, the outer side of the connecting circular plate 43 is ring-connected with an outer ring plate 44, the outer side of the outer ring plate 44 is provided with a passive adjustment gear 45, the passive adjustment gear 45 is meshed with an active adjustment gear 46, the active adjustment gear 46 is internally provided with a control knob 47, the upper end of the outer ring plate 44 is connected to an upper end isolation ring column 48, and the inner side of the upper end isolation ring column 48 is provided with four sets of collecting heads 49, so that the device The bottom lifting column sleeve 41 and the bottom lifting column 42 can be used for lifting and lowering, and the device can rotate the upper isolation ring column 48 to a certain extent through the cooperation between the passive adjustment gear 45 and the active adjustment gear 46 to achieve a suitable collection angle. A signal connection channel that cooperates with the collection head 49 is opened inside the upper isolation ring column 48, and a signal connection channel is opened on the outer ring plate 44. A signal connection channel that cooperates with the collection head 49 is opened on the upper end of the aiming device base 1, so that the adjustment function of the spectral signal receiving module 4 can be operated on the aiming device base 1, providing a basis for function realization.

[0041] The spectrum signal receiving module 4 transmits the spectrum signal to the spectrometer via an optical fiber, and can collect spectrum data of the plasma generated by the solid sample from different directions of the plasma.

[0042] Working principle: Turn on the power, place the fixed object to be detected on the bottom lifting column 42, press the control knob 47 to control the bottom lifting column 42 to rise or fall to the appropriate height, adjust the laser aiming module 3 to the appropriate angle for aiming, then turn on the power switch to start laser excitation, rotate the control knob 47 to drive the active adjustment gear 46, and then drive the passive adjustment gear 45 to adjust to the appropriate angle for spectrum collection, and finally view the analysis results through the front display 2.

[0043] The standard parts used can be purchased from the market and can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the components known to technical personnel in this field, their structures and principles can be known to these technical personnel through technical manuals or through conventional experimental methods.

[0044] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A solid sample detection and aiming device for laser induced breakdown spectroscopy technology, characterized in that: The aiming device base (1) and the front display screen (2), wherein the front display screen (2) is connected to the front end of the aiming device base (1) by a circuit, is characterized in that: the left upper end of the aiming device base (1) is connected to a laser aiming module (3), and the central upper end of the aiming device base (1) is provided with a spectrum signal receiving module (4): The aiming device base (1) comprises a base body (11), and the base body (11) is fixedly arranged on the rear side of the front display screen (2); The laser aiming module (3) comprises a connecting support rod (31), and the connecting support rod (31) is fixedly arranged on the left side of the upper end of the aiming device base (1); The spectrum signal receiving module (4) comprises a bottom lifting column sleeve (41), and the bottom lifting column sleeve (41) is fixedly arranged at the center of the upper end of the aiming device base (1).

2. The solid sample detection and aiming device for laser-induced breakdown spectroscopy technology according to claim 1, characterized in that: A power transmission box (12) is provided inside the left side of the base body (11), a signal analysis box (13) is provided inside the right side of the base body (11), and a power switch is provided at the rear side of the base body (11).

3. The solid sample detection and aiming device for laser-induced breakdown spectroscopy technology according to claim 2, characterized in that: The base body (11) has a cavity inside which a power transmission box (12) and a signal analysis box (13) are matched, the upper end of the base body (11) has a groove which is matched with a laser aiming module (3) and a spectrum signal receiving module (4), and the base body (11) has circuit channels for connecting various devices.

4. The solid sample detection and aiming device for laser-induced breakdown spectroscopy technology according to claim 1, characterized in that: The upper end of the connecting support rod (31) is rotatably connected to a second light guide arm (33) via a first light guide arm (32); a third light guide arm (34) is provided at the bottom of the second light guide arm (33); and a photomultiplier tube (35) is rotatably connected to the bottom of the third light guide arm (34).

5. The solid sample detection and aiming device for laser-induced breakdown spectroscopy technology according to claim 4, characterized in that: The connecting support rod (31), the first light guide arm (32), and the second light guide arm (33) are provided with energy transmission channels therein.

6. The solid sample detection and aiming device for laser-induced breakdown spectroscopy technology according to claim 4, characterized in that: The shape of the photomultiplier tube (35) is similar to a right-angle C-shaped photomultiplier tube (35), and the bottom of the photomultiplier tube (35) is aligned with the center of the spectrum signal receiving module (4).

7. The solid sample detection and aiming device for laser-induced breakdown spectroscopy technology according to claim 1, characterized in that: The bottom lifting column sleeve (41) is sleeved with a bottom lifting column (42), the outer side of the upper end of the bottom lifting column (42) is ring-connected with a connecting circular plate (43), the outer side of the connecting circular plate (43) is ring-connected with an outer ring plate (44), the outer side of the outer ring plate (44) is provided with a passive adjustment gear (45), the passive adjustment gear (45) is meshed with an active adjustment gear (46), the active adjustment gear (46) is provided with a control knob (47), the upper end of the outer ring plate (44) is connected with an upper end isolation ring column (48), and the inner side of the upper end isolation ring column (48) is provided with four groups of collecting heads (49).

8. The solid sample detection and aiming device for laser-induced breakdown spectroscopy technology according to claim 7, characterized in that: A signal connection channel cooperating with a collecting head (49) is provided inside the upper end isolation ring column (48), a signal connection channel is provided on the outer ring plate (44), and a signal connection channel cooperating with the collecting head (49) is provided on the upper end of the aiming device base (1).

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