Laboratory scale in-situ detection device based on laser-induced fluorescence spectrometry

Abstract

The invention relates to the technical field of soil-groundwater pollution in-situ detection, in particular to a laboratory scale in-situ detection device based on laser-induced fluorescence spectrometry. A laboratory scale in-situ detection device based on laser-induced fluorescence spectrometry is used for detecting pollutants in a to-be-detected area in a laboratory and comprises a laser transmitter, a detection assembly and a fluorescence receiving and data processor. The in-situ detection device further comprises a shell, the shell is provided with an inner cavity used for containing the detection assembly, when the in-situ detection device is used, the shell is placed in the to-be-detected area, the laser emitter emits laser to the to-be-detected area, pollutants in the to-be-detected area generate fluorescence, the detection assembly detects the fluorescence and transmits the fluorescence to the fluorescence receiving and data processor, and the fluorescence receiving and data processor receives the fluorescence. The detection assembly can ascend and descend in the inner cavity so as to detect pollutants in the to-be-detected areas with different depths. According to the method, detection conditions can be provided for researching migration distribution of DNAPLs pollutants in a laboratory, identifying pollutant types and carrying out spectrum identification on composite pollutants.

Description

Technical Field

[0001] The present invention relates to the technical field of soil-groundwater pollution in-situ detection, and in particular to a laboratory-scale in-situ detection device based on laser-induced fluorescence spectroscopy. Background Art

[0002] Heavy non-aqueous phase liquids (DNAPLs) refer to a type of organic pollution that is relatively common among the many substances that cause groundwater or soil pollution. Its migration and transformation process is very complex, with the characteristics of deep burial, diverse phases, slow migration and persistent pollution. At the same time, the migration and transformation process of DNAPLs pollutants in water or soil environments is affected by multiple factors such as their physical and chemical properties, hydrogeological conditions, and hydrogeochemical conditions.

[0003] In the existing technology, DNAPLs of water or soil pollutants are generally detected using laser-induced fluorescence spectroscopy technology. Since the migration and transformation process of DNAPLs is complex and affected by many factors, it is impossible to accurately identify the type of pollutants or perform spectral identification of complex pollutants. It requires long-term systematic research in the laboratory, but there is currently a lack of in-situ detection devices suitable for laboratories. Summary of the invention

[0004] In view of this, it is necessary to provide a laboratory-scale in-situ detection device based on laser induced fluorescence spectroscopy, which can be used for in-situ detection of pollutants in the laboratory.

[0005] The present invention provides a laboratory-scale in-situ detection device based on laser induced fluorescence spectroscopy, which is used to detect pollutants in a to-be-detected area in a laboratory, and includes a laser emitter, a detection component, and a fluorescence receiver and data processor, wherein the detection component is electrically connected to the laser emitter and the fluorescence receiver and data processor, respectively; the laboratory-scale in-situ detection device based on laser induced fluorescence spectroscopy also includes a shell, which is provided with an inner cavity for accommodating the detection component. During use, the shell is placed in the to-be-detected area, the laser emitter emits laser to the to-be-detected area, the pollutants in the to-be-detected area generate fluorescence and pass through the shell, the detection component detects the fluorescence and transmits it to the fluorescence receiver and data processor, and the detection component can be raised and lowered in the inner cavity to detect pollutants in the to-be-detected area at different depths.

[0006] The laboratory-scale in-situ detection device based on laser-induced fluorescence spectroscopy of the present invention is suitable for use in laboratories, and is convenient for studying the migration and transformation process of DNAPLs, or the influence of physical and chemical properties, hydrogeological conditions and hydrogeochemical conditions on its migration process in the laboratory. The setting of the shell can protect the internal detection components, the shell can be pre-buried in the experimental box, and can also provide a lifting space for the detection components, without setting a drill bit to dig the soil, and the lifting detection components can finely detect pollutants in the area to be detected from different depths.

[0007] In one of the embodiments, at least one side surface of the housing is configured as a light-transmitting member.

[0008] It can be understood that the light-transmitting member can transmit laser and fluorescence, and can block the object to be detected from entering the housing and affecting the detection component.

[0009] In one embodiment, the detection component includes an optical mirror, which is arranged in the inner cavity. The laser emitter includes a transmitter head, which extends into the inner cavity and is arranged toward the optical mirror. The optical mirror can change the optical path of the laser emitted by the transmitter head so as to direct the laser emitted by the transmitter head to the light-transmitting member.

[0010] It is understandable that the optical mirror can change the optical path of the laser so that the vertically emitted laser can be emitted horizontally to the area to be detected.

[0011] In one embodiment, the detection component further includes a fixed frame and a fluorescent probe. The fixed frame is provided with an opening on one side, the opening of the fixed frame faces the light-transmitting member, and the optical mirror and the fluorescent probe are fixed in the fixed frame.

[0012] It is understandable that the fixed frame can integrate components such as the optical mirror and the fluorescent probe together and can be raised and lowered as a whole.

[0013] In one embodiment, an elastic limiting member is provided on the peripheral side of the fixing frame, one end of the elastic limiting member is provided on the fixing frame, and the other end abuts against the inner wall of the shell.

[0014] It can be understood that the elastic limiting member plays a limiting role to prevent the detection component from shaking, and the elastic limiting member can enable the detection component to slide smoothly.

[0015] In one embodiment, the shell includes a accommodating portion and a supporting portion, the accommodating portion is connected to the supporting portion, a side surface of the accommodating portion is the light-transmitting member, and the supporting portion is arranged at one end of the accommodating portion and extends in a direction away from the central axis of the accommodating portion.

[0016] It can be understood that the provision of the support portion can enhance the overall stability of the laboratory-scale in-situ detection device based on laser-induced fluorescence spectroscopy.

[0017] In one embodiment, the laboratory-scale in-situ detection device based on laser-induced fluorescence spectroscopy also includes a lifting component, one end of which is connected to the detection component, and the other end extends out of the inner cavity to drive the detection component to rise and fall.

[0018] In one embodiment, the lifting assembly includes a rack and a driver, and the laboratory-scale in-situ detection device based on laser induced fluorescence spectroscopy also includes a support frame, the support frame is fixedly connected to the shell, the driver is fixed on the support frame and engages with the rack to drive the rack to move, the rack is passed through the support frame, one end of the rack is connected to the detection assembly, and the other end extends out of the inner cavity.

[0019] It can be understood that the provision of the support frame can not only make the structure of the laboratory-scale in-situ detection device based on laser induced fluorescence spectroscopy more stable, but also provide a platform for the installation of the driver.

[0020] In one of the embodiments, the laboratory-scale in-situ detection device based on laser-induced fluorescence spectroscopy further includes a scale, which is connected to the detection component and rises and falls with the detection component.

[0021] It can be understood that the scale can display the depth of the corresponding to-be-detected area where the detection component is located.

[0022] In one embodiment, the laboratory-scale in-situ detection device based on laser induced fluorescence spectroscopy also includes a cable trough box, which is connected to the detection component and is used for wiring harnesses, the lifting component includes a rack connected to the detection component, the cable trough box is attached to one side of the rack, and the scale is attached to a side of the cable trough box away from the rack; or, the scale is attached to one side of the rack, and the cable trough box is attached to a side of the scale away from the rack.

[0023] Such an arrangement can make the structure more compact.

[0024] The present invention designs a laboratory-scale in-situ detection device based on laser-induced fluorescence spectroscopy for laboratories, which provides detection conditions for studying the migration distribution of DNAPLs pollutants, identifying the types of pollutants, and spectral identification of complex pollutants in the laboratory. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is a schematic structural diagram of a laboratory-scale in-situ detection device based on laser-induced fluorescence spectroscopy according to an embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of the internal structure of the fixed frame;

[0028] Figure 3 A top view of the detection assembly and housing.

[0029] 100. Laboratory-scale in-situ detection device based on laser-induced fluorescence spectroscopy; 10. Laser transmitter; 11. Transmitter head; 12. Main body; 20. Detection component; 21. Optical mirror; 211. Connecting frame; 2111. First frame; 2112. Second frame; 22. Fixed frame; 221. Elastic limiter; 222. Bracket; 23. Fluorescence probe; 30. Fluorescence receiver and data processor; 40. Shell; 401. Inner cavity; 41. Transparent member; 42. Accommodating portion; 43. Support portion; 50. Lifting component; 51. Rack; 52. Driver; 521. Gear; 60. Support frame; 70. Scale; 80. Cable trough box. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0031] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of the present invention are for illustrative purposes only and do not represent the only implementation method.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] Unless otherwise defined, all technical and scientific terms used in the specification of the present invention have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in the specification of the present invention includes any and all combinations of one or more related listed items.

[0035] The present invention provides a laboratory-scale in-situ detection device 100 (hereinafter referred to as the in-situ detection device) based on laser induced fluorescence spectroscopy, which is suitable for detecting the type and concentration of pollutants in a to-be-detected area in a laboratory. The to-be-detected objects may be soil, groundwater, etc., and the pollutants may be heavy non-aqueous liquid pollutants.

[0036] See also Figure 1 The in-situ detection device 100 includes a laser emitter 10, a detection component 20 and a fluorescence receiving and data processor 30, and the detection component 20 is electrically connected to the laser emitter 10 and the fluorescence receiving and data processor 30 respectively. The laser emitter 10 emits laser light toward the area to be detected, and the energy of the laser photons is absorbed by the molecules and atoms of the pollutants in the area to be detected, and their ground state undergoes transition. The molecules or atoms in the high energy state will return to the ground state due to instability, and release energy and emit fluorescence in the process. The detection component 20 detects the fluorescence and transmits it to the fluorescence receiving and data processor 30, and the fluorescence receiving and data processor 30 analyzes the types and concentrations of the molecules and atoms of the pollutants.

[0037] The in-situ detection device 100 also includes a shell 40, which is provided with an inner cavity 401 for accommodating the detection component 20. The detection component 20 can be raised and lowered in the inner cavity 401. When the in-situ detection device 100 is used, the shell 40 is placed in an experimental box in the laboratory, and the object to be detected is placed in the gap formed by the shell 40 and the experimental box. The gap between the shell 40 and the experimental box forms a detection area, and the fluorescence in the detection area can be detected by the detection component 20 through the shell 40. The shell 40 can not only protect the internal detection component 20, but also provide a lifting space for the detection component 20. The present invention is applied to the laboratory, the shell 40 can be pre-buried, and the detection component 20 raised and lowered in the inner cavity 401 can detect pollutants of different depths. The detection component 20 is raised and lowered inside the shell 40, and is not blocked by the object to be detected. There is no need to set a drill bit to dig the soil. The structure is simple, providing a device for detecting the concentration and type of pollutants for the laboratory, and providing conditions for finely studying the migration and transformation process of DNAPLs.

[0038] At least one side surface of the housing 40 is configured as a light-transmitting member 41 , so that laser light can be emitted from the light-transmitting member 41 to the area to be detected, and fluorescence can pass through the light-transmitting member 41 and be detected by the detection component 20 .

[0039] In one embodiment, one side of the housing 40 is set as a light-transmitting member 41, and the other sides are not set as light-transmitting, which can save costs. Of course, in other embodiments, two, three, or four sides can also be set as light-transmitting surfaces, or the entire housing 40 can be set as light-transmitting.

[0040] Preferably, the light-transmitting member 41 is sapphire glass, which has high optical transparency, high hardness, and is scratch-resistant and chemical-resistant.

[0041] In one embodiment, the light-transmitting member 41 extends from one end of the housing 40 to the other end, thereby providing sufficient light-transmitting conditions so that the detection component 20 can detect fluorescence in all directions.

[0042] Furthermore, the other side surfaces of the housing 40 , ie, except the side surfaces where the light-transmitting member 41 is disposed, are made of polyetherketonek (PEK), so that the housing 40 has corrosion resistance.

[0043] In one embodiment, the sapphire glass and other parts of the housing 40 are connected by a wedge shape, which is convenient to connect and has a simple structure. Of course, in other embodiments, the connection can also be made by gluing, bolting, etc.

[0044] Specifically, the housing 40 includes a receiving portion 42 and a supporting portion 43, the receiving portion 42 and the supporting portion 43 are connected, the inner cavity 401 is opened in the receiving portion 42, and the supporting portion 43 is arranged at one end of the receiving portion 42 and extends in a direction away from the central axis of the receiving portion 42. During detection, the supporting portion 43 covers the surface of the object to be detected, so that the housing 40 is more stable when in use.

[0045] In one embodiment, the accommodating portion 42 is in the shape of a cube. In other embodiments, the accommodating portion 42 may be in the shape of a cylinder or other shapes.

[0046] One end of the accommodating portion 42 has an opening connected to the inner cavity 401 , and the opening of the accommodating portion 42 is for the detection component 20 to enter and exit, that is, the opening of the accommodating portion 42 is opened at the top and the bottom is sealed to prevent the object to be detected from entering the inner cavity 401 and affecting the detection component 20 .

[0047] The accommodating portion 42 and the supporting portion 43 are arranged vertically, so that the supporting portion 43 is more closely fitted to the surface of the area to be detected.

[0048] See also Figure 2 The detection assembly 20 includes an optical mirror 21, which is disposed in the inner cavity 401 and is used to change the optical path of the laser so that the laser can be emitted to the light-transmitting member 41, and thus emitted to the area to be detected. The laser emitter 10 includes a main body 12 and a transmitter head 11, the main body 12 is disposed outside the housing 40, and the transmitter head 11 extends into the inner cavity 401 and emits the laser toward the optical mirror 21, which is reflected or refracted by the optical mirror 21 to the light-transmitting member 41.

[0049] In one embodiment, the optical mirror 21 is a right-angle prism, one of the right-angle sides is used for installation and fixation, and the right-angled slope is inclined toward the light-transmitting member 41 .

[0050] A connecting frame 211 is provided on the optical mirror 21 for fixing the emitting head 11 of the laser emitter 10. The connecting frame 211 includes a first frame 2111 and a second frame 2112. The first frame 2111 is connected to the optical mirror 21, and the second frame 2112 extends toward the light-transmitting member 41 so that the connecting frame 211 forms a "Г" shape or a "T" shape. The emitting head 11 is passed through the second frame 2112, thereby fixing the emitting head 11.

[0051] The detection assembly 20 further includes a fixed frame 22 and a fluorescent probe 23 . The fixed frame 22 is opened on one side. The opening of the fixed frame 22 faces the light-transmitting member 41 . The optical mirror 21 and the fluorescent probe 23 are disposed in the fixed frame 22 .

[0052] See also Figure 3, an elastic stopper 221 is provided on the circumference of the fixed frame 22, one end of the elastic stopper 221 is connected to the fixed frame 22, and the other end is in contact with the inner wall of the housing 40. Since the detection assembly 20 needs to move up and down, the elastic stopper 221 is provided to stabilize the detection assembly 20 to prevent it from shaking, and the elastic stopper 221 enables the detection assembly 20 to slide smoothly. The elastic stopper 221 can be a rubber pad or a plastic element with a certain elasticity.

[0053] In one embodiment, the fixed frame 22 is a rectangular parallelepiped, and the number of elastic limit members 221 is 12, with 4 each at the bottom, the middle and the top, and the 4 elastic limit members 221 are respectively arranged on the four corners. In other embodiments, the number of elastic limit members 221 can be adjusted according to the different shapes of the fixed frame 22. For example, if the height of the fixed frame 22 is shorter, 8 elastic limit members 221 can be set.

[0054] The fixing frame 22 and the accommodating portion 42 have the same shape, so that the fixing frame 22 can better fit with the accommodating portion 42 .

[0055] Furthermore, a bracket 222 is provided on the top of the fixing frame 22 , and the bracket 222 is used to connect other components.

[0056] The fluorescent probe 23 and the transmitter head 11 are integrated into one body, thereby saving the internal space of the fixing frame 22. The fluorescent probe 23 has two optical cables built in, one of which is connected to the main body 12 of the laser transmitter 10, and the other is connected to the fluorescent receiver and data processor 30.

[0057] The in-situ detection device 100 further includes a lifting assembly 50 , which is connected to the detection assembly 20 and is used to drive the detection assembly 20 to rise and fall.

[0058] Specifically, the lifting assembly 50 is connected to the bracket 222, which can enhance the connection strength. The bracket 222 can be a cube or a cylinder.

[0059] In one embodiment, the lifting assembly 50 includes a rack 51 and a driver 52, the rack 51 extends from the opening of the housing 40 and is connected to the bracket 222, and the driver 52 is engaged with the rack 51 to drive the rack 51 to move up and down, thereby driving the detection assembly 20 to move up and down. In other embodiments, the lifting assembly 50 can also be a telescopic cylinder, the telescopic rod of the telescopic cylinder is connected to the detection assembly 20, and the telescopic cylinder is extended and retracted, thereby driving the detection assembly 20 to move up and down.

[0060] The driver 52 includes a gear 521 and a motor (not shown), the gear 521 is arranged on the output shaft of the motor, the in-situ detection device 100 also includes a support frame 60, the motor is fixed on the support frame 60, the support frame 60 is connected to the housing 40, and the rack 51 is passed through the support frame 60. Since the motor is fixedly installed, the gear 521 does not move at a height position, and the gear 521 rotates, causing the rack 51 to move up and down. The setting of the support frame 60 provides a platform for placing the driver 52, and its connection with the housing 40 makes the in-situ detection device 100 more stable.

[0061] In one embodiment, the cross section of the support frame 60 is trapezoidal, and the lower base close to the housing 40 is longer than the upper base away from the housing 40 , so as to further enhance the stability of the in-situ detection device 100 .

[0062] The in-situ detection device 100 further includes a scale 70 , which is connected to the detection component 20 and rises and falls with the detection component 20 . The scale 70 can clearly display the depth position of the detection component 20 , thereby accurately depicting objects to be detected at different depths.

[0063] The scale 70 is placed vertically, penetrates the support frame 60 and extends from the opening of the shell 40 to be connected with the bracket 222 .

[0064] The in-situ detection device 100 further includes a cable trough box 80, which is connected to the bracket 222 and is used for the wiring of the wire harness. The optical fiber of the laser transmitter 10 is passed through the cable trough box 80 and the fixed frame 22. The cable of the laser transmitter 10 is passed through the cable trough box 80, and the transmitter head 11 thereof extends into the fixed frame 22 until it is close to the optical mirror 21, thereby emitting laser light toward the optical mirror 21.

[0065] In one embodiment, the cable trough box 80 is attached to one side of the rack 51, and the scale 70 is attached to the side of the cable trough box 80 away from the rack 51. Such an arrangement not only makes the structure more compact and stable, but also, the scale 70 is arranged on one side, which is convenient for human eyes to observe the depth of the detection component 20 without being blocked.

[0066] In another embodiment, the scale 70 is attached to one side of the rack 51, and the cable trough box 80 is attached to the side of the scale 70 away from the rack 51. The cable trough box 80 is arranged on one side to facilitate the installation of the wire harness in the cable trough box 80.

[0067] During use, the shell 40 is first placed in the experimental box, and then the object to be detected is filled into the gap between the shell 40 and the experimental box. The detection component 20 can be raised and lowered in the shell 40 without any obstruction to detect pollutants in the area to be detected at different depths. The drive motor rotates, thereby driving the gear 521 to rotate, and the gear 521 and the rack 51 are meshed, thereby driving the rack 51 to move downward, and the detection component 20 is moved to the position of the corresponding scale. The transmitter 11 emits laser, and the laser is reflected by the right-angle prism and emitted to the light-transmitting member 41, and then emitted to the area to be detected. Adjust the laser wavelength. When the energy of the laser photon matches the energy level of the molecule or atom of a certain pollutant in the area to be detected, the molecule or atom will absorb the photon energy and transition to a high-energy state. The molecule or atom in the high-energy state is unstable and will return to the ground state, while releasing energy to generate fluorescence. The fluorescence probe 23 detects the fluorescence and sends it to the fluorescence receiving and data processor 30, which analyzes the type and concentration of the pollutant. The in-situ detection device 100 of the present invention can provide detection conditions for finely characterizing the migration distribution of DNAPLs pollutants, identifying the types of pollutants, and spectral identification of complex pollutants in the laboratory.

[0068] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, appropriate changes and modifications to the above embodiments are within the scope of protection claimed by the present invention.

Claims

1. A laboratory-scale in-situ detection device based on laser-induced fluorescence spectroscopy, used for detecting pollutants in a to-be-detected area in a laboratory, comprising a laser transmitter (10), a detection component (20) and a fluorescence receiver and data processor (30), wherein the detection component (20) is connected to the laser transmitter (10) and the fluorescence receiver and data processor (30), respectively; It is characterized in that The laboratory-scale in-situ detection device (100) based on laser-induced fluorescence spectroscopy further comprises a shell (40), wherein the shell (40) is provided with an inner cavity (401) for accommodating the detection component (20); during use, the shell (40) is placed in the area to be detected, the laser emitter (10) emits laser light to the area to be detected, the pollutants in the area to be detected generate fluorescence and pass through the shell (40), the detection component (20) detects the fluorescence and transmits it to the fluorescence receiving and data processor (30), and the detection component (20) can be raised and lowered in the inner cavity (401) to detect pollutants in the area to be detected at different depths.

2. The laboratory-scale in-situ detection device based on laser induced fluorescence spectroscopy according to claim 1, characterized in that: At least one side surface of the housing (40) is provided as a light-transmitting member (41).

3. The laboratory-scale in-situ detection device based on laser induced fluorescence spectroscopy according to claim 2, characterized in that: The detection component (20) comprises an optical mirror (21), wherein the optical mirror (21) is disposed in the inner cavity (401); the laser emitter (10) comprises a transmitter head (11), wherein the transmitter head (11) extends into the inner cavity (401) and is disposed toward the optical mirror (21); and the optical mirror (21) is capable of changing the optical path of the laser emitted by the transmitter head (11) so as to direct the laser emitted by the transmitter head (11) to the light-transmitting member (41).

4. The laboratory-scale in-situ detection device based on laser induced fluorescence spectroscopy according to claim 3, characterized in that: The detection component (20) further comprises a fixed frame (22) and a fluorescent probe (23); one side of the fixed frame (22) is provided with an opening, the opening of the fixed frame (22) faces the light-transmitting member (41); and the optical mirror (21) and the fluorescent probe (23) are fixed in the fixed frame (22).

5. The laboratory-scale in-situ detection device based on laser induced fluorescence spectroscopy according to claim 4, characterized in that: An elastic limiting member (221) is provided on the peripheral side of the fixing frame (22), one end of the elastic limiting member (221) is provided on the fixing frame (22), and the other end abuts against the inner wall of the shell (40).

6. The laboratory-scale in-situ detection device based on laser-induced fluorescence spectroscopy according to claim 2, characterized in that: The housing (40) comprises a receiving portion (42) and a supporting portion (43); the receiving portion (42) is connected to the supporting portion (43); one side surface of the receiving portion (42) is the light-transmitting member (41); and the supporting portion (43) is arranged at one end of the receiving portion (42) and extends in a direction away from the central axis of the receiving portion (42).

7. The laboratory-scale in-situ detection device based on laser-induced fluorescence spectroscopy according to claim 1, characterized in that: The laboratory-scale in-situ detection device (100) based on laser-induced fluorescence spectroscopy further comprises a lifting component (50), one end of which is connected to the detection component (20), and the other end of which extends out of the inner cavity (401) to drive the detection component (20) to rise and fall.

8. The laboratory-scale in-situ detection device based on laser-induced fluorescence spectroscopy according to claim 7, characterized in that: The lifting assembly (50) comprises a rack (51) and a driver (52); the laboratory-scale in-situ detection device (100) based on laser induced fluorescence spectroscopy further comprises a support frame (60); the support frame (60) is fixedly connected to the shell (40); the driver (52) is fixed to the support frame (60) and meshes with the rack (51) to drive the rack (51) to move; the rack (51) is passed through the support frame (60); one end of the rack (51) is connected to the detection assembly (20), and the other end extends out of the inner cavity (401).

9. The laboratory-scale in-situ detection device based on laser-induced fluorescence spectroscopy according to claim 7, characterized in that: The laboratory-scale in-situ detection device (100) based on laser-induced fluorescence spectroscopy further comprises a scale (70), wherein the scale (70) is connected to the detection component (20).

10. The laboratory-scale in-situ detection device based on laser-induced fluorescence spectroscopy according to claim 9, characterized in that: The laboratory-scale in-situ detection device (100) based on laser induced fluorescence spectroscopy further comprises a cable trough box (80), the cable trough box (80) being connected to the detection component (20) and being used for threading a wire harness, the lifting component (50) comprising a rack (51) connected to the detection component (20), the cable trough box (80) being attached to one side of the rack (51), and the scale (70) being attached to a side of the cable trough box (80) away from the rack (51); or, the scale (70) being attached to one side of the rack (51), and the cable trough box (80) being attached to a side of the scale (70) away from the rack (51).

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