Laser-induced breakdown spectroscopy fused salt online detection device and method combined with inert atmosphere

Abstract

The invention provides an inert atmosphere-combined laser-induced breakdown spectroscopy fused salt online detection device and method. The detection device comprises a sealed box body, a heating furnace, a laser-induced breakdown spectroscopy system and a computer, wherein a sealed cavity is defined by the sealed box body, inert atmosphere is arranged in the sealed cavity, and a quartz diaphragm is arranged at the top of the sealed box body; the heating furnace is connected with the bottom of the sealing box body, the heating furnace is provided with a heating cavity, fused salt is arranged in the heating cavity, an opening of the heating cavity is covered with a furnace cover, the furnace cover is provided with a furnace cover opening, and the furnace cover opening and the quartz window piece are oppositely arranged; the laser-induced breakdown spectroscopy system is arranged on the outer side of the sealed box body and is used for emitting laser to the fused salt through the quartz diaphragm and the furnace cover opening and collecting spectral information of the fused salt; and the computer is electrically connected with the laser-induced breakdown spectroscopy system and is used for analyzing the collected spectral information so as to obtain component information of the fused salt.

Description

Technical Field

[0001] This application relates to the field of spectral detection technology, and in particular to an online detection device and method for laser-induced breakdown spectroscopy of molten salt combined with an inert atmosphere. Background Technology

[0002] Molten salts offer advantages such as economy, safety, radiation resistance, and a wide electrochemical window, making them suitable as the working medium for molten salt reactors and dry reprocessing in molten salt electrolysis. Real-time monitoring of metal ion concentrations in molten salts, such as uranium, plutonium, fission products, and corrosion products, is crucial. Real-time monitoring of metal ion concentrations in molten salts can be used to control reaction processes, guide safe and efficient process flows, and facilitate nuclear material balance and nuclear emergency response. Currently, the industry commonly relies on inductively coupled plasma optical emission spectrometry (ICP-OES) for component analysis after sampling. This method requires multiple steps, including sampling, sample preparation, and laboratory analysis, resulting in significant time delays and failing to meet the real-time feedback requirements for concentration data in process flows.

[0003] Laser-induced breakdown spectroscopy (LIBS) is an atomic emission spectrometry technique used for the analysis of material composition. LIBS works by emitting a high-energy pulsed laser and focusing it onto the surface of a sample (solid, liquid, gas, or suspension). This heats, vaporizes, and ionizes minute amounts of material (on the nanogram scale) within an extremely short time, creating a transient high-temperature, high-density plasma. During the rapid cooling (on the microsecond scale), the excited atoms and ions within the plasma de-excite, releasing light radiation with specific wavelengths—the characteristic spectra of the analyte. These characteristic lights are collected, dispersed, and detected by a spectrometer. By analyzing the wavelength and intensity of the spectral lines, qualitative (what element it is) and quantitative (how much it contains) analyses can be performed on the elements in the sample.

[0004] However, since molten salts are often in a closed environment that requires strict isolation from oxygen and moisture and protection against radiation and leakage in actual processes, their storage, high-temperature reaction, electrolysis and online detection usually need to be carried out under an inert atmosphere. Therefore, there are few studies on the determination of molten salts using conventional LIBS technology.

[0005] In view of this, there is an urgent need to provide an online detection device and method for molten salt using laser-induced breakdown spectroscopy combined with an inert atmosphere, so as to enable rapid analysis of the composition of molten salt. Summary of the Invention

[0006] This application is made in view of the aforementioned state of the prior art. The purpose of this application is to provide an online detection device and method for molten salt using laser-induced breakdown spectroscopy combined with an inert atmosphere, which enables rapid analysis of the composition of molten salt.

[0007] A laser-induced breakdown spectroscopy (LASPS) online detection device for molten salt in an inert atmosphere is provided. The device includes a sealed enclosure, a heating furnace, a LASPS system, and a computer. The sealed enclosure forms a sealed cavity, which is filled with the inert atmosphere. A quartz window is located at the top of the sealed enclosure. The heating furnace is connected to the bottom of the sealed enclosure and has a heating cavity containing the molten salt. A furnace cover is provided over the opening of the heating cavity, and the furnace cover has an opening opposite to the quartz window. The LASPS system is located outside the sealed enclosure and is used to emit laser light into the molten salt through the quartz window and the furnace cover opening, and to collect the spectral information of the molten salt. The computer is electrically connected to the LASPS system and is used to analyze the collected spectral information to obtain the composition information of the molten salt.

[0008] Optionally, the detection device further includes a lifting component, and the heating furnace is indirectly connected to the bottom of the sealed box through the lifting component. The lifting component is located at the bottom of the sealed box, and the heating furnace is located on the lifting component. The lifting component can drive the heating furnace to move up and down inside the sealed box.

[0009] Optionally, the lifting component includes a fixing block and a push rod; the fixing block is disposed at the bottom of the sealed housing and extends outward from the bottom of the sealed housing in a vertical direction; the housing of the fixing block surrounds a push rod receiving cavity, wherein the push rod receiving cavity and the sealed cavity are in communication; one end of the push rod is disposed in the push rod receiving cavity, and the other end of the push rod is connected to the heating furnace, which can drive the heating furnace to move in a vertical direction along the bottom of the sealed housing, so as to adjust the distance between the molten salt in the heating furnace and the focusing lens of the laser-induced breakdown spectroscopy system to the focal length of the focusing lens.

[0010] Optionally, the lifting component further includes a lifting platform and a guide rail; wherein, the push rod is connected to the lifting platform, so that the push rod drives the lifting platform to rise and fall within the sealed cavity, and the lifting platform drives the heating furnace to rise and fall; one end of the guide rail is connected to the fixed block, and the other end of the guide rail extends vertically along the bottom of the sealed box and passes through the lifting platform, and is connected to the top of the sealed box, so that the lifting platform moves along the guide rail.

[0011] Optionally, the laser-induced breakdown spectroscopy system includes a coaxial optical path device, a laser emitter, and a spectral acquisition device; wherein the coaxial optical path device includes a dichroic mirror and a focusing lens, wherein the centerline of the focusing lens coincides with the centerline of the heating furnace; the laser emitted by the laser emitter passes sequentially through the dichroic mirror and the focusing lens, and irradiates the molten salt in the heating furnace, causing the molten salt to generate spectral information; the spectral information passes sequentially through the focusing lens and the dichroic mirror, and is collected by the spectral acquisition device.

[0012] Optionally, the detection device further includes a rangefinder disposed on the outside of the sealed enclosure to measure the distance between the focusing lens of the laser-induced breakdown spectroscopy system and the molten salt inside the heating furnace.

[0013] Optionally, the sealed housing is provided with a glove opening, which is connected to the opening of a glove, wherein the glove can be inserted into the sealed cavity through the glove opening.

[0014] Optionally, the inert atmosphere includes argon.

[0015] This application also provides an online detection method for molten salt using laser-induced breakdown spectroscopy combined with an inert atmosphere. The detection method uses the online detection device for molten salt using laser-induced breakdown spectroscopy combined with an inert atmosphere according to this application. The detection method includes: placing a sample to be tested in a heating furnace located within a sealed cavity, wherein the sealed cavity is set with an inert atmosphere, and wherein the sample to be tested includes a KCl-LiCl sample; heating the sample to be tested to obtain molten salt; emitting a laser to the molten salt using a laser-induced breakdown spectroscopy system to generate spectral information; collecting the spectral information using the laser-induced breakdown spectroscopy system; and analyzing the spectral information to obtain the composition information of the molten salt.

[0016] Optionally, the detection method further includes: adjusting the height of the heating furnace so that the distance between the molten salt inside the heating furnace and the focusing lens of the laser-induced breakdown spectroscopy system is the focal length of the focusing lens. Attached Figure Description

[0017] Figure 1 An exemplary structural diagram of an online detection device for laser-induced breakdown spectroscopy of molten salt in conjunction with an inert atmosphere, according to one embodiment of this application, is shown.

[0018] Figure 2A An exemplary structural diagram of the coaxial optical path device of a laser-induced breakdown spectroscopy molten salt online detection device in conjunction with an inert atmosphere, according to one embodiment of this application, is shown.

[0019] Figure 2BAn exemplary structural diagram of the coaxial optical path device of a laser-induced breakdown spectroscopy molten salt online detection device in conjunction with an inert atmosphere, according to another embodiment of this application, is shown.

[0020] Figure 3 The spectrum of the detection results of a molten salt sample from a laser-induced breakdown spectroscopy molten salt online detection device combined with an inert atmosphere, according to another embodiment of this application, is shown.

[0021] Figure 4 An exemplary block diagram of an online detection method for molten salt using laser-induced breakdown spectroscopy in conjunction with an inert atmosphere, according to another embodiment of this application, is shown.

[0022] Explanation of reference numerals in the attached figures

[0023] 10 Sealed enclosure

[0024] 11 Quartz window plate

[0025] 12 Glove openings

[0026] 20 Heating Furnace

[0027] 21 Furnace Lid

[0028] 30 Laser-induced breakdown spectroscopy system

[0029] 31 Coaxial optical path device

[0030] 311 First Opening

[0031] 312 Second opening

[0032] 313 Third Opening

[0033] 32 Laser emitters

[0034] 33 Spectrum Acquisition Unit

[0035] 40 Lifting components

[0036] 41 Fixed Block

[0037] 42 Putter

[0038] 43 Lifting Platform

[0039] 44 guide rails

[0040] 50 rangefinder

[0041] 60 computers Detailed Implementation

[0042] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0043] like Figure 1 As shown, embodiments of this application provide an online detection device for molten salt using laser-induced breakdown spectroscopy combined with an inert atmosphere.

[0044] The laser-induced breakdown spectroscopy molten salt online detection device may include a sealed enclosure 10, a heating furnace 20, and a laser-induced breakdown spectroscopy system 30.

[0045] The sealed enclosure 10 forms a sealed cavity, within which the water and oxygen content can be below 2 ppm (parts per million) to meet the requirements for sample measurement and preservation. Furthermore, this sealed cavity is isolated from the outside environment to prevent leakage and contamination.

[0046] The sealed cavity is set with an inert atmosphere. This inert atmosphere may include argon gas. It should be understood that the argon gas can be high-purity argon, and its working pressure can be adjusted within the range of +10 to -10 mbar. It is important to understand that this working pressure is a relative pressure, meaning the pressure within the sealed cavity can fluctuate within 10 mbar relative to standard atmospheric pressure. Preferably, its working pressure can be adjusted within the range of -1 to -5 mbar to prevent leakage and contamination. By setting an inert atmosphere, the surface of the lava after laser ablation can be prevented from being rapidly oxidized, ensuring that each laser pulse acts on fresh, homogeneous material, rather than a surface covered with an oxide layer, making the analytical results more representative of the sample's true bulk composition.

[0047] A quartz window 11 is provided on the top 101 of the sealed enclosure 10. Specifically, the top 101 of the sealed enclosure 10 may be provided with a flange hole, and the quartz window 11 can be connected to the flange hole through the flange. By providing the quartz window 11, laser light from outside the sealed enclosure 10 can pass through the quartz window 11 and irradiate the inside of the sealed enclosure 10, and light from inside the sealed enclosure 10 can also pass through the quartz window 11 and propagate outward.

[0048] The heating furnace 20 is connected to the bottom 102 of the sealed housing 10. It should be understood that the heating furnace 20 is located inside the sealed housing, i.e., in the sealed cavity.

[0049] The heating furnace 20 has a heating chamber in which a potassium chloride-lithium chloride (KCl-LiCl) sample is placed. The KCl-LiCl sample can be placed directly inside the heating chamber. Alternatively, the KCl-LiCl sample can be placed inside a crucible. By placing the crucible inside the heating chamber and heating the KCl-LiCl sample using the heating furnace 20, the solid salt (i.e., the KCl-LiCl sample) can be heated to a molten liquid salt (i.e., molten salt). In this case, the molten salt is placed inside the heating chamber. It should be understood that the aforementioned KCl-LiCl sample can be a mixture prepared in a specific ratio.

[0050] The heating furnace 20 can be a high-temperature heating furnace, with a heating temperature range from room temperature to 1200℃.

[0051] It should be understood that the sealed enclosure 10 may have a sealed opening for taking in and taking out the aforementioned KCl-LiCl sample and molten salt. When it is necessary to take in or take out the KCl-LiCl sample or molten salt, the aforementioned sealed opening can be opened to take in or take out the KCl-LiCl sample or molten salt, and then the sealed opening can be closed.

[0052] The heating chamber is covered by a furnace lid 21 with an opening, which is positioned opposite to the quartz window 11. Specifically, the furnace lid 21 can be a removable quartz cover with a size of φ150 mm. The opening on the furnace lid 21 can be obtained through an electrode hole. It should be understood that when the molten salt is placed inside the crucible, the projection of the furnace lid opening along the thickness direction of the sealed chamber 10 is entirely within the projection of the crucible, ensuring that the laser light passing through the furnace lid opening can fully illuminate the inside of the crucible.

[0053] Furthermore, the furnace lid opening can be circular, and its size can be determined based on the crucible size. The diameter of the furnace lid opening can be smaller than the diameter of the crucible. For example, when the crucible diameter is 60 mm, the diameter of the furnace lid opening can be less than 60 mm. It should be understood that, in order for the laser to pass through the furnace lid opening, the diameter of the furnace lid opening is preferably greater than 20 mm.

[0054] Understandably, the furnace cover opening can utilize laser and spectral information, and it also facilitates the cleaning of molten salt contaminants.

[0055] The laser-induced breakdown spectroscopy system 30 is located on the outside of the sealed enclosure 10 and is used to emit laser light into the molten salt through the quartz window 11 and the furnace cover opening, as well as to collect the spectral information of the molten salt, wherein the spectral information includes characteristic spectra.

[0056] The laser emitted by the laser-induced breakdown spectroscopy system 30 can be emitted through the quartz window 11 and the furnace lid opening onto the surface of the molten salt that has been heated to a molten state, so that the molten salt can be heated rapidly and form a plasma containing excited-state atoms of the molten salt. When the plasma cools down, it will emit a characteristic spectrum. The aforementioned characteristic spectrum can be transmitted to the laser-induced breakdown spectroscopy system 30 through the furnace lid opening and the quartz window 11 to achieve the collection of the characteristic spectrum of the molten salt.

[0057] The detection device may also include a computer 60, which is electrically connected to a laser-induced breakdown spectroscopy system 30. The computer can analyze the collected spectral information to obtain the composition information of the molten salt. This composition information may include the elemental types and concentrations of the molten salt. It is understood that the computer 60 should be interpreted broadly, and any device with information processing capabilities can be used as an example of this computer.

[0058] Furthermore, the computer can control the triggering of the laser emitter of the laser-induced breakdown spectroscopy system 30 and control the spectral acquisition device of the laser-induced breakdown spectroscopy system 30 to acquire spectral information.

[0059] Understandably, after the spectral acquisition device collects the spectral information of the molten salt, the computer 60 can analyze that spectral information. For example... Figure 3 As shown, the horizontal axis of the spectrum represents wavelength (nm), and the vertical axis represents intensity (au, i.e., relative intensity). The spectrum shows that after the molten salt is excited, it emits two relatively strong signals (wavelengths of 366.972 nm and 385.939 nm), with characteristic peaks at 366.972 nm and 385.939 nm. The positions and relative intensities of these two peaks match the known spectrum of uranium ions (UII), thus confirming the presence of uranium in the sample. Furthermore, the intensity of light at wavelength 385.939 nm is greater than that at wavelength 366.972 nm. Therefore, after obtaining the spectrum of this molten salt sample, qualitative analysis of the elements in the sample (e.g., the presence of uranium) can be performed. This allows us to determine the types and concentrations of elements in the molten salt.

[0060] Understandably, compared to existing inductively coupled plasma atomic emission spectrometry (ICP-AES) methods, this application avoids multiple steps such as molten salt sample preparation and laboratory analysis. After placing the molten salt in a heating furnace, the proposed method enables rapid analysis of the molten salt's composition, thus improving efficiency.

[0061] Optionally, the testing device also includes a lifting component 40. The heating furnace 20 is indirectly connected to the bottom 102 of the sealed box 10 through the lifting component 40. The lifting component 40 is disposed at the bottom 102 of the sealed box 10, and the heating furnace 20 is disposed on the lifting component 40. The lifting component 40 can drive the heating furnace 20 to move up and down inside the sealed box 10.

[0062] It is understood that the lifting component 40 may include a precision electric translation stage (e.g., a combination of a precision lead screw and a motor) and a precision manual displacement platform (with a micrometer or micrometer to ensure the accuracy of adjustment), etc.

[0063] Optionally, the detection device also includes a rangefinder 50, which is disposed outside the sealed housing 10. The rangefinder 50 can be used to measure the distance between the focusing lens of the laser-induced breakdown spectroscopy system 30 and the molten salt inside the heating furnace 20. Here, the focusing lens should be understood broadly, and can be a collective term for one or a group of or more focusing lenses.

[0064] The distance between the focusing lens and the molten salt inside the heating furnace 20 is measured using a rangefinder 50. Furthermore, by providing a lifting component 40, the height of the heating furnace can be adjusted, thereby adjusting the height of the molten salt inside the furnace. Through the combined use of the rangefinder 50 and the lifting component 40, the height of the molten salt can be adjusted to the focal point of the focusing lens of the laser-induced breakdown spectroscopy system 30. It is understood that when the laser beam is focused at the focal point, the energy density of the focused spot can reach its maximum, thereby exciting the plasma in the molten salt within a short time, thus improving efficiency.

[0065] Optionally, the lifting component 40 includes a fixing block 41 and a push rod 42; the fixing block 41 is disposed at the bottom 102 of the sealed housing 10, and the fixing block 41 is along the vertical direction of the bottom 102 of the sealed housing 10 (the optical axis direction within the sealed housing 10). Figure 1 The fixed block 41 extends outward toward the sealed housing 10 in the vertical direction. The housing of the fixed block 41 surrounds the push rod receiving cavity, wherein the push rod receiving cavity and the sealed cavity are connected. One end of the push rod 42 is set in the push rod receiving cavity, and the other end of the push rod 42 is connected to the heating furnace 20, which can drive the heating furnace 20 to move along the vertical direction of the bottom 102 of the sealed housing 10, so as to adjust the distance between the molten salt in the heating furnace 20 and the focusing lens of the laser-induced breakdown spectroscopy system 30 as the focal length of the focusing lens.

[0066] In some embodiments, the top of the fixing block 41 may be open, while the sides and bottom of the fixing block 41 are sealed. Further, the opening at the top of the fixing block 41 may be located on the bottom 102 of the sealed housing 10. A through hole may be provided on the bottom 102, allowing communication between the push rod receiving cavity and the sealed cavity. Further, the push rod 42 may be movably connected to the through hole, allowing relative displacement between the push rod and the through hole (i.e., the bottom 102 of the sealed housing 10), enabling movement along the vertical direction of the bottom 102, thereby driving the heating furnace 20 to move along the vertical direction relative to the bottom 102, and thus adjusting the height of the molten salt within the heating furnace.

[0067] Optionally, in other embodiments, the lifting component 40 further includes a lifting platform 43 and a guide rail 44 (e.g., Figure 1 (as shown in the figure). The push rod 42 is connected to the lifting platform 43, so that the push rod drives the lifting platform 43 to rise and fall in the sealed cavity, and the lifting platform 43 drives the heating furnace 20 to rise and fall. One end of the guide rail 44 is connected to the fixed block 41, and the other end of the guide rail 44 extends vertically along the bottom 102 of the sealed box 10 and passes through the lifting platform 43, and is connected to the top 101 of the sealed box 10, so that the lifting platform 43 can move along the guide rail 44.

[0068] It is understandable that the guide rail 44 is fixed. By setting the lifting platform 43 to move along the guide rail 44, the lifting platform 43 is prevented from shaking during the movement, which in turn prevents the molten salt in the heating furnace 20 from shaking during the movement, thereby improving the stability of the molten salt during the movement.

[0069] Optionally, the laser-induced breakdown spectroscopy system 30 includes a coaxial optical path device 31, a laser emitter 32, and a spectrum collector 33; wherein, the coaxial optical path device 31 includes a dichroic mirror and a focusing lens, wherein the center line of the focusing lens coincides with the center line of the heating furnace 20; the laser emitted by the laser emitter 32 passes through the dichroic mirror and the focusing lens in sequence, and irradiates the molten salt in the heating furnace 20, causing the molten salt to generate spectral information; the spectral information passes through the focusing lens and the dichroic mirror in sequence, and is collected by the spectrum collector 33.

[0070] See Figure 2A The coaxial optical path device 31 may include a first opening 311, a second opening 312 and a third opening 313. The central axis of the first opening 311 may be coaxially arranged with the central axis of the third opening 313, and the opening directions of the two openings are opposite. Furthermore, the opening direction of the second opening 312 may be perpendicular to the opening direction of the first opening.

[0071] It is understandable that the dichroic mirror can be placed inside the coaxial optical path device 31, and the focusing lens can be placed on the third opening 313.

[0072] The laser emitted by laser emitter 32 can propagate from the first opening into the coaxial optical path device 31. The laser maintains its irradiation direction when passing through the dichroic mirror within the coaxial optical path device 31 and propagates to the focusing lens on the third opening 313. Thereafter, it can focus downwards and converge at a single point (i.e., the focal point of the focusing lens) after passing through the quartz window 11. If molten salt is placed at the focal point of the focusing lens, the laser can pass through the furnace lid opening and converge onto the molten salt, thereby rapidly exciting the molten salt and generating spectral information.

[0073] The laser emitter 32 can be a pulsed solid-state laser, such as a high-power Q-switched Nd:YAG pulsed solid-state laser with a wavelength of 1064 nm.

[0074] Furthermore, the spectral information generated by the molten salt, after passing through the furnace cover opening and the quartz window 11, can be transmitted through the focusing lens of the third opening 313 to the dichroic mirror in the optical path device 31, and then can be reflected so that it can be transmitted outward from the second opening 312 and collected by the spectral collector 33.

[0075] It is necessary to understand that, such as Figure 1 As shown, the light emitted by the laser emitter 32 can be transmitted through an optical fiber to the first opening 311. The spectral information transmitted from the third opening 313 can also be transmitted through an optical fiber to the spectral collector 33.

[0076] In other embodiments, such as Figure 2B As shown, the central axis of the first opening can be set parallel to the central axis of the second opening, and the central axis of the first opening can be set perpendicular to the central axis of the third opening.

[0077] Furthermore, the coaxial optical path device 31 can be equipped with two dichroic mirrors, and a focusing lens can be installed on the third opening. When the laser emitted by the laser emitter 32 propagates from the first opening into the dichroic mirror, it can be reflected, causing the laser to propagate downwards in the vertical direction, and then be focused and propagated downwards after passing through the focusing lens of the third opening.

[0078] Furthermore, after the spectral information is transmitted into the coaxial optical path device 31 through the focusing lens of the third opening, the spectral information can be reflected by another dichroic mirror, and thus can be transmitted outward through the second opening, so that its spectral information can be collected by the spectral acquisition device.

[0079] In one example, the spectral acquisition device could be an eight-channel spectrometer that can cover a wide spectral range from 200 to 1100 nm with an optical resolution of 0.1 nm.

[0080] Optionally, the sealed housing 10 is provided with a glove opening 12, which is connected to the opening of a glove, wherein the glove can be inserted into the sealed cavity through the glove opening 12.

[0081] The glove can be a well-sealed rubber glove to prevent leakage of argon gas within the sealed cavity. Users can operate on the internal components of the sealed housing 10 by inserting their hands into the glove from the outside of the housing. Furthermore, the glove can be 8 inches in size.

[0082] like Figure 4 As shown, embodiments of this application also provide an online detection method 400 for molten salt using laser-induced breakdown spectroscopy combined with an inert atmosphere. This detection method 400 uses the online detection device for molten salt using laser-induced breakdown spectroscopy combined with an inert atmosphere according to this application. The detection method 400 may include: Step S401, placing the sample to be tested in a heating furnace located within a sealed cavity, wherein the sealed cavity is set with an inert atmosphere, and wherein the sample to be tested can be a different molten salt system, such as a KCl-LiCl sample, a pure lithium chloride (LiCl) sample, or a lithium chloride-lithium oxide (LiCl-Li2O) sample, etc. Step S402, heating the sample to be tested to obtain molten salt. It is understood that the aforementioned KCl-LiCl sample can be a solid salt, and the molten salt obtained after heating can be a molten liquid salt. Step S403, emitting a laser to the molten salt using a laser-induced breakdown spectroscopy system to generate spectral information from the molten salt. Step S404, collecting the spectral information using the laser-induced breakdown spectroscopy system. Step S405: Analyze the spectral information to obtain the composition information of the molten salt.

[0083] It should be understood that the detection method may also include: placing the KCl-LiCl sample in a heating furnace and heating the heating furnace to heat the solid KCl-LiCl sample to a molten liquid salt (i.e., molten salt).

[0084] Furthermore, the laser-induced breakdown spectroscopy molten salt online detection method may also include adjusting the height of the heating furnace so that the distance between the molten salt in the heating furnace and the focusing lens of the laser-induced breakdown spectroscopy system is equal to the focal length of the focusing lens.

[0085] It is understandable that when the molten liquid salt is located at the focal point of the focusing lens of the laser-induced breakdown spectroscopy system, the laser emitted by the laser-induced breakdown spectroscopy system can have the highest energy density at this position, thereby rapidly exciting the plasma of the molten salt.

[0086] It should be understood that at least some aspects or features of the above-described implementation methods, embodiments, or examples can be appropriately combined.

[0087] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

[0088] It should be understood that the above-described embodiments, examples, or examples are merely exemplary and are not intended to limit this application. Those skilled in the art can make various modifications and changes to the above-described embodiments, examples, or examples under the teachings of this application without departing from the scope of this application.

Claims

1. An online detection device for molten salt using laser-induced breakdown spectroscopy combined with an inert atmosphere, characterized in that, It includes a sealed enclosure (10), a heating furnace (20), a laser-induced breakdown spectroscopy system (30), and a computer (60); among which, The sealed box (10) forms a sealed cavity, the sealed cavity is provided with the inert atmosphere, and the top (101) of the sealed box (10) is provided with a quartz window (11). The bottom (102) of the heating furnace (20) and the sealed box (10) are connected. The heating furnace (20) has a heating chamber, and the molten salt is disposed in the heating chamber. The opening of the heating chamber is covered with a furnace cover (21), and the furnace cover (21) is provided with a furnace cover opening. The furnace cover opening and the quartz window plate (11) are arranged opposite to each other. The laser-induced breakdown spectroscopy system (30) is located on the outside of the sealed box (10) and is used to emit laser light into the molten salt through the quartz window (11) and the furnace cover opening and to collect the spectral information of the molten salt. The computer (60) and the laser-induced breakdown spectroscopy system (30) are electrically connected for analyzing the spectral information to obtain the composition information of the molten salt.

2. The detection device according to claim 1, characterized in that, The detection device further includes a lifting component (40), and the heating furnace (20) is indirectly connected to the bottom (102) of the sealed box (10) through the lifting component (40). The lifting component (40) is located at the bottom (102) of the sealed box (10), and the heating furnace (20) is located on the lifting component (40). The lifting component (40) can drive the heating furnace (20) to move up and down inside the sealed box (10).

3. The detection device according to claim 2, characterized in that, The lifting component (40) includes a fixed block (41) and a push rod (42). The fixing block (41) is disposed at the bottom (102) of the sealing box (10), and the fixing block (41) extends toward the outside of the sealing box (10) along the vertical direction of the bottom (102) of the sealing box (10). The housing of the fixing block (41) surrounds a push rod receiving cavity, wherein the push rod receiving cavity and the sealing cavity are in communication. One end of the push rod (42) is disposed in the push rod receiving cavity, and the other end of the push rod (42) is connected to the heating furnace (20), which can drive the heating furnace (20) to move along the vertical direction of the bottom (102) of the sealed box (10) to adjust the distance between the molten salt in the heating furnace (20) and the focusing lens of the laser-induced breakdown spectroscopy system (30) to the focal length of the focusing lens.

4. The detection device according to claim 3, characterized in that, The lifting component (40) further includes a lifting platform (43) and a guide rail (44); wherein, The push rod (42) is connected to the lifting platform (43), so that the push rod drives the lifting platform (43) to rise and fall in the sealed cavity, and the lifting platform (43) drives the heating furnace (20) to rise and fall. One end of the guide rail (44) is connected to the fixed block (41), and the other end of the guide rail (44) extends vertically along the bottom (102) of the sealed box (10) and passes through the lifting platform (43), and is connected to the top (101) of the sealed box (10), so that the lifting platform (43) can move along the guide rail (44).

5. The detection device according to claim 1, characterized in that, The laser-induced breakdown spectroscopy system (30) includes a coaxial optical path device (31), a laser emitter (32), and a spectral acquisition device (33); wherein, The coaxial optical path device (31) includes a dichroic mirror and a focusing lens, wherein the center line of the focusing lens coincides with the center line of the heating furnace (20); The laser emitted by the laser emitter (32) passes sequentially through the dichroic mirror and the focusing lens, and then irradiates the molten salt in the heating furnace (20), causing the molten salt to generate spectral information. The spectral information passes sequentially through the focusing lens and the dichroic mirror, and is collected by the spectral collector (33).

6. The detection device according to claim 1, characterized in that, The detection device also includes a rangefinder (50), which is located on the outside of the sealed housing (10) to measure the distance between the focusing lens of the laser-induced breakdown spectroscopy system (30) and the molten salt inside the heating furnace (20).

7. The detection device according to any one of claims 1 to 6, characterized in that, The sealed box (10) is provided with a glove opening (12), which is connected to the opening of a glove, wherein the glove can be inserted into the sealed cavity through the glove opening (12).

8. The detection device according to any one of claims 1 to 6, characterized in that, The inert atmosphere includes argon.

9. A method for online detection of molten salt using laser-induced breakdown spectroscopy combined with an inert atmosphere, characterized in that, The detection method uses the laser-induced breakdown spectroscopy molten salt online detection device combined with an inert atmosphere as described in any one of claims 1 to 8, and the detection method includes: The sample to be tested is placed in a heating furnace located in a sealed cavity, wherein the sealed cavity is set with an inert atmosphere, and wherein the sample to be tested includes a KCl-LiCl sample; The sample to be tested is heated to obtain molten salt; A laser-induced breakdown spectroscopy system is used to emit laser light into the molten salt, causing the molten salt to generate spectral information. The spectral information was collected using a laser-induced breakdown spectroscopy system; The spectral information is analyzed to obtain the composition information of the molten salt.

10. The detection method according to claim 9, characterized in that, The detection method further includes: The height of the heating furnace is adjusted so that the distance between the molten salt inside the heating furnace and the focusing lens of the laser-induced breakdown spectroscopy system is equal to the focal length of the focusing lens.

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