In-situ Transmission Focusing Type Photocatalytic Nuclear Magnetic Resonance Probe and Nuclear Magnetic Resonance Spectrometer

Abstract

An embodiment of the present invention provides an in-situ transmission focusing type photocatalytic nuclear magnetic resonance probe and a nuclear magnetic resonance spectrometer. The nuclear magnetic resonance probe includes: a probe body, a laser, and an optical fiber assembly; the probe body includes: a sample cavity and electronic radio frequency components. The sample cavity includes a cavity formed by surrounding the electronic radio frequency components and is used to accommodate a sample tube; the optical fiber assembly includes optical fibers; the probe body further includes a tuning circuit and a probe base, and the probe base is coaxially and fixedly installed at the bottom of the electronic radio frequency components; the tuning circuit is located below the probe base, and the optical fiber is introduced from the bottom of the probe to above the tuning circuit; the optical mirror assembly is located above the tuning circuit, used to fix the optical fiber and introduce the light source into the optical mirror assembly, and the light source collimated and focused by the optical mirror assembly is introduced from the through hole of the probe base to the bottom of the sample tube, thereby realizing in-situ photocatalysis.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of in-situ detection of nuclear magnetic signals, and particularly to an in-situ transmission focusing type photocatalytic nuclear magnetic resonance probe and a nuclear magnetic resonance spectrometer. Background Art

[0002] In-situ nuclear magnetic resonance technology (NMR) is an advanced analytical technique that can provide detailed information about chemical reaction processes at the molecular level. This technique is particularly suitable for the study of photocatalytic reactions, as photocatalysis is a process that uses light energy to drive chemical reactions and is widely applied in fields such as organic synthesis, environmental purification, and energy conversion.

[0003] Photocatalytic reactions usually involve the excitation of photosensitizers (such as semiconductor materials) under light illumination to generate electron-hole pairs, and these electrons and holes can react with reactants to promote the progress of chemical reactions. However, the mechanism of photocatalytic reactions is often very complex, involving multiple intermediates and transient species, which makes it difficult for traditional characterization methods to comprehensively understand the reaction process.

[0004] The advantage of in-situ NMR technology is that it can monitor the chemical changes during the reaction process in real time without disturbing the reaction system. By measuring the NMR signals at different time points, researchers can obtain detailed information about reactants, intermediates, and products, including their concentration changes, chemical shifts, and coupling constants, etc. These data help to reveal the mechanism of photocatalytic reactions, including processes such as electron transfer, energy transfer, and the formation and cleavage of chemical bonds.

[0005] In addition, in-situ NMR technology can also be combined with other characterization techniques, such as ultraviolet-visible spectroscopy (UV-Vis), fluorescence spectroscopy, and electrochemical methods, etc., to obtain more comprehensive information about photocatalytic reactions. This method of using multiple techniques in combination can provide a deeper understanding and help to optimize the design of photocatalytic materials and improve the reaction efficiency.

[0006] In-situ nuclear magnetic resonance technology provides a powerful tool for the study of photocatalytic reactions, which helps to deeply understand the complexity of the photocatalytic process and promote the development and application of photocatalytic technology. Just because the in-situ nuclear magnetic signal detection technology plays an increasingly important role in the study of photocatalytic reactions, currently, the application of nuclear magnetic resonance spectrometers in the field of photocatalytic research is limited by the photocatalytic devices constructed by users themselves, and these devices generally lack key performances such as high power, high stability, and wavelength selectivity. Therefore, there is an urgent need to develop a simplified-structured, highly efficient, and user-friendly in-situ NMR system to promote the in-depth exploration of the mechanism of photocatalytic reactions.

[0007] However, nuclear magnetic resonance (NMR) technology itself is a highly sensitive physical analysis method that relies on the resonance phenomenon of atomic nuclei in a sample in a strong magnetic field. Combining the photocatalysis process with NMR technology requires solving multiple technical problems. First, photocatalytic reactions usually require light of specific wavelengths, and the magnetic field environment of NMR equipment has strict requirements for the propagation of light and the illumination conditions of the sample. Second, the detection of intermediate and transient species generated by photocatalysis requires NMR technology with high time resolution, which is difficult to achieve in existing technologies. The design and manufacture of commonly used NMR probes on the market are already very precise and complex. Integrating additional optical components to achieve photocatalytic functions requires redesigning the internal structure of the probe, which is not only technically challenging but may also affect the acquisition quality and stability of existing NMR signals. Current in-situ photocatalytic NMR technologies mostly involve modifying the NMR tube, for example, introducing a light source through optical fibers and LEDs. Although this method has a low cost, it has problems with insufficient light intensity and uniformity, which directly affect the photocatalytic efficiency and the accuracy of NMR signals. Summary of the Invention

[0008] To solve the above technical problems, the present invention provides a transmission focusing type in-situ photocatalytic nuclear magnetic resonance probe and a nuclear magnetic resonance spectrometer:

[0009] First, select a probe with a more flexible internal structure design. By designing and adjusting the internal structure of the probe, especially the structure of the tuning circuit under the probe base, and optimizing the structure of the tuning circuit, sufficient space is left at the center position inside the probe to provide enough space for embedding optical components and optical fibers inside the probe. Second, select a "transmission focusing type" solution for the optical path design inside the probe. Introduce the optical fiber into the space inside the center of the tuning circuit, pass through the tuning circuit, and introduce it under the probe base. Then, introduce it into the optical mirror positioning component through the optical fiber positioning component, thereby achieving the focusing and collimation of the light source. The light source passing through the optical mirror component passes through the through hole of the probe base and directly irradiates the sample in the sample tube, thereby triggering a photocatalytic reaction. Finally, place the probe in a high-field magnet and combine it with a control cabinet, a data acquisition unit, etc., to monitor the progress of the photocatalytic reaction in real time and conduct efficient research on the photocatalytic reaction mechanism and kinetics under in-situ conditions.

[0010] This application designs a "transmission focusing type" light source input system for the probe, introducing an independent "transmission focusing type" light source import system, enabling it to not only retain its original function but also have the ability to conduct in-situ photocatalytic reactions and detect the nuclear magnetic resonance signals of photocatalytic products.

[0011] Specifically, the in-situ transmission focusing type photocatalytic nuclear magnetic resonance probe includes:

[0012] Probe body, laser, and fiber optic component; the probe body includes: a sample chamber and electronic radio frequency components. The sample chamber includes a cavity formed by surrounding the electronic radio frequency components and is used to accommodate a sample tube; the fiber optic component includes an optical fiber. The probe body further includes a tuning circuit and a probe base. The probe base is coaxially and fixedly installed at the bottom of the radio frequency electronic components; the tuning circuit is located below the probe base. The optical fiber is introduced from the bottom of the probe into the space reserved inside the center of the tuning circuit and then introduced below the probe base; the optical mirror assembly is located above the tuning circuit, used to fix the optical fiber and introduce the light source into the optical mirror assembly. The light source focused and collimated by the optical mirror assembly is introduced from the through hole of the probe base to the bottom of the sample tube and irradiates the sample, thereby realizing the transmission focusing of the light source.

[0013] In some embodiments, the tuning circuit includes a tuning coil, a tuning rod, and a capacitor. The center of the tuning circuit has a cavity that can accommodate a 2-mm optical fiber, and sufficient space is reserved above to enable the optical mirror assembly to be embedded therein.

[0014] In some embodiments, the internal optical path of the nuclear magnetic resonance probe is of the transmission focusing type, including an optical path that is independent of key components of the probe such as the tuning bar and the temperature control device and can accommodate a 2-mm optical fiber at the edge position inside the nuclear magnetic resonance probe. One end of the optical fiber is connected to the laser, and the other end passes through the bottom of the nuclear magnetic resonance probe and, through the optical path at the edge inside the nuclear magnetic resonance probe, the light source input to the probe passes through the optical mirror assembly and directly irradiates the sample in the sample tube from the bottom of the sample tube.

[0015] In some embodiments, the fiber optic component further includes a front-end coupler and a rear-end coupler respectively connected to the front end and the rear end of the optical fiber; the front end of the optical fiber is connected to the laser, and the rear end passes through the bottom of the probe and is connected to the optical mirror assembly inside the probe through the optical path at the edge of the nuclear magnetic resonance probe.

[0016] In some embodiments, the optical mirror assembly includes an optical mirror positioning assembly, an optical fiber positioning assembly, and an optical mirror.

[0017] In some other embodiments, the optical mirror is composed of a convex lens and a concave lens. The light source in the optical fiber first passes through the convex lens, and the light will be focused on a focal point. If the light source is located at the focal point of the first lens, the light will become a parallel beam after passing through the convex lens. Then, the concave lens diverges the light passing through the convex lens. The combination of the two lenses enables the light to form a parallel or nearly parallel beam after passing through the doublet lens, and the collimation effect can be achieved by adjusting the distance between the two lenses and their respective focal lengths.

[0018] Furthermore, the optical lens described above is composed of three convex lenses, namely a collecting lens, an intermediate lens, and an output lens. The collecting lens is close to the light source emitted from the optical fiber, collects the light from the optical fiber, and focuses or collimates it. The intermediate lens is located between the collecting lens and the output lens and is used to further adjust the focusing state and spot size of the light. The output lens is located above the intermediate lens and close to the probe base. After the light passes through the output lens, a collimated light beam is formed, and the light processed by the previous lens is further focused or collimated to finally form a parallel light beam.

[0019] In some embodiments, the optical lens positioning assembly includes a lens barrel for fixing the optical lens. The optical fiber positioning assembly is located below the optical lens positioning assembly and is used to fix the optical fiber and introduce the light source of the optical fiber into the optical lens assembly. The light source passes through the optical lens in sequence, thereby achieving the focusing and collimation of the light source.

[0020] In some other embodiments, the optical lens assembly is located below the probe base and is connected to the probe base by a thread. A through hole is reserved on the probe base so that the light source passing through the optical lens assembly can be focused on the bottom of the sample tube.

[0021] In some embodiments, the size of the through hole on the probe base can be adjusted according to the size of the sample tube to maximize the light source passing through the through hole and irradiating the sample in the sample tube.

[0022] In some embodiments, the in-situ photocatalytic nuclear magnetic resonance probe is sheathed with a protective sleeve.

[0023] In some embodiments, the laser is a high-power continuous-wave laser.

[0024] In some embodiments, by configuring different lasers, a full-band light source including ultraviolet light, visible light, and infrared light can be provided.

[0025] In some embodiments, a nuclear magnetic resonance spectrometer is provided, which includes the in-situ transmission focusing type photocatalytic nuclear magnetic resonance probe described above.

[0026] In some embodiments, the nuclear magnetic resonance spectrometer further includes a magnet, a control cabinet, and a nuclear magnetic signal real-time acquisition unit, thereby obtaining the nuclear magnetic resonance signal of the photocatalytic reaction system.

[0027] In some embodiments, the nuclear magnetic resonance spectrometer can conduct in-situ studies on the photocatalytic reaction mechanism and kinetics through a data acquisition system for real-time monitoring and a nuclear magnetic temperature-changing system.

[0028] In addition, although the optical fiber component and the optical mirror component are optimized according to the designed internal structure and spatial size of the probe, for a probe with a simple internal structure and a large space, the sizes and shapes of the optical fiber component and the optical mirror component can also be customized and optimized according to actual needs to make them applicable to different types of probes.

[0029] Another embodiment of the present invention further provides a nuclear magnetic resonance spectrometer, including the in-situ transmission focusing type photocatalytic nuclear magnetic resonance probe described in any one of the above embodiments.

[0030] Moreover, all components of this solution have no magnetic properties.

[0031] Based on the disclosure of the above embodiments, it can be known that the beneficial effects shown by the embodiments of the present invention include:

[0032] (1) By designing and adjusting the internal structure of the probe, the present invention enables the interior of the probe to have sufficient space to accommodate the optical mirror component and the optical fiber, allowing the light source to stably irradiate the sample tube and evenly irradiate the sample. This not only ensures the tight combination of the optical components and the probe but also maximally improves the sensitivity and accuracy of in-situ photocatalytic NMR detection, thereby providing a new technical means for studying the photocatalytic reaction mechanism and kinetics under in-situ conditions. Moreover, the components are convenient to disassemble, leaving room for introducing new functions into the probe in the future.

[0033] (2) The present invention designs a "transmission focusing type" light source input system for the NMR probe, which can provide a uniform light source with full wavelength bands and high intensity, enabling it to simultaneously have the ability to perform in-situ photocatalytic reactions and detect the NMR signals of photocatalytic products.

[0034] Other features and advantages of the present invention will be described in the following specification. Moreover, some of them will become obvious from the specification or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures specifically pointed out in the written specification, claims, and drawings.

[0035] The technical solution of the present invention will be further described in detail below through the drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. At the appropriate time, the same reference numerals will be used to refer to the same or similar parts in all the drawings. Such embodiments are illustrative and are not intended to be an exhaustive or exclusive embodiment of the device or method. In the drawings:

[0037] Figure 1 This is a schematic structural diagram of the in-situ transmission focusing type photocatalytic nuclear magnetic resonance probe in the embodiment of the present invention.

[0038] Figure 2 This is a schematic structural diagram of the main body of the in-situ transmission focusing type photocatalytic nuclear magnetic resonance probe in the embodiment of the present invention.

[0039] Figure 3 This is a partial schematic structural diagram of the optical fiber in the embodiment of the present invention.

[0040] Reference numerals:

[0041] 1 - Probe main body, 2 - Laser, 3 - Optical fiber assembly, 4 - Electronic radio frequency element, 5 - Sample cavity, 6 - Sample tube, 7 - Probe base, 8 - Through hole, 9 - Optical mirror assembly, 10 - Tuning circuit, 11 - Optical fiber, 12 - Tuning rod, 13 - Tuning coil, 14 - Capacitor. Detailed implementation manners

[0042] Next, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings, but it is not a limitation of the present invention.

[0043] It should be understood that various modifications can be made to the embodiments disclosed herein. Therefore, the following description should not be regarded as restrictive, but only as an example of the embodiments. Those skilled in the art will think of other modifications within the scope and spirit of the present disclosure.

[0044] The accompanying drawings included in the specification and constituting a part of the specification show the embodiments of the present disclosure, and together with the general description of the present disclosure given above and the detailed description of the embodiments given below, are used to explain the principles of the present disclosure.

[0045] These and other features of the present invention will become apparent from the following description of the preferred forms of the embodiments given by way of non-limiting examples with reference to the accompanying drawings.

[0046] It should also be understood that although the present invention has been described with reference to some specific examples, those skilled in the art can surely implement many other equivalent forms of the present invention, which have the features as described in the claims and thus are all within the protection scope defined thereby.

[0047] When combined with the accompanying drawings, the above and other aspects, features, and advantages of the present disclosure will become more apparent in view of the following detailed description.

[0048] Specific embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present disclosure, which can be implemented in various ways. Well-known and / or repetitive functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but are merely used as a basis for claims and a representative basis for teaching those skilled in the art to use the present disclosure in substantially any suitable detailed structure in various ways.

[0049] This specification may use the phrase "in one embodiment", "in another embodiment", "in yet another embodiment", or "in other embodiments", which may each refer to one or more of the same or different embodiments according to the present disclosure.

[0050] Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0051] As Figure 1 、 Figure 2 、 Figure 3 shown, an in-situ transmission focusing type photocatalytic nuclear magnetic resonance probe is provided in an embodiment of the present invention, including:

[0052] A probe body 1, a laser 2, and an optical fiber assembly 3; the probe body 1 includes: a sample cavity 5, and electronic radio frequency components 4. The sample cavity 5 includes a cavity formed by surrounding the electronic radio frequency components 4 for accommodating a sample tube 6; the probe body 1 further includes a tuning circuit 10 and a probe base 7. The probe base 7 is coaxially and fixedly installed at the bottom of the radio frequency electronic components 4; the tuning circuit 10 is located below the probe base 7. The optical fiber 11 is introduced from the bottom of the probe to the inner center position of the tuning circuit 10 and introduced to a light mirror assembly 9 below the probe base. The light mirror assembly 9 is located above the tuning circuit 10 for fixing the optical fiber 11 and introducing a light source into the light mirror assembly 9. The light beam focused by the light mirror assembly 9 is introduced to the bottom of the sample tube 6 through a through hole 8 in the probe base 7, thereby realizing the transmission focusing of the light source.

[0053] The light mirror assembly 9 includes a lens barrel and a light mirror. The light mirrors are, from top to bottom, a collecting mirror, an intermediate lens, and an output mirror. The optical fiber positioning assembly is located below the light mirror positioning assembly for fixing the optical fiber and introducing the light source of the optical fiber into the light mirror assembly. The light source first passes through the collecting mirror and the intermediate lens, and then passes through the output mirror, thereby realizing the focusing and collimation of the light source. The light source focused by the light mirror passes through the through hole 8 of the probe base 7 and is introduced below the sample tube 6, thereby realizing in-situ photocatalysis.

[0054] The described tuning circuit 10 includes a tuning rod 12, a tuning coil 13, and a capacitor 14. The inner center of the tuning circuit 10 has a cavity capable of accommodating a 2-mm optical fiber so that the optical fiber can pass through it. Sufficient space is reserved above the tuning circuit 10 to enable the optical mirror assembly 9 to be embedded therein.

[0055] The optical mirror assembly 9 accurately positions the optical mirror at the center of the probe (nuclear magnetic resonance probe) by means of precision machining with non-magnetic materials. The diameter of the through hole 8 matches the diameter of the nuclear magnetic tube to ensure that the light source uniformly irradiates all areas at the bottom of the sample tube.

[0056] In addition, an embodiment of the present invention further provides a nuclear magnetic resonance spectrometer, including the above-described in-situ transmission focusing type photocatalytic nuclear magnetic resonance probe, as well as a magnet, a control cabinet, and a nuclear magnetic signal real-time acquisition unit, thereby obtaining the nuclear magnetic resonance signal of the photocatalytic reaction system.

[0057] The probe of this embodiment has the following beneficial effects: It can provide an efficient light source for in-situ photocatalytic reactions and real-time collect nuclear magnetic resonance signals, providing a new technical means for studying photocatalytic reaction mechanisms and kinetics. The probe of this embodiment combines an optical path construction technology and a nuclear magnetic resonance technology. The former is responsible for precisely guiding the laser into the nuclear magnetic tube to trigger the photocatalytic reaction, and the latter monitors the changes in chemical components in a superconducting magnetic field environment.

[0058] Specifically, in this embodiment, the laser 2 is a high-power continuous-wave laser, including a laser power supply and a laser head, showing excellent optical stability of less than 5%. The emission wavelength of the laser is set to 450 nanometers, but the design allows it to be replaced with other wavelengths to cover the spectral range from ultraviolet to near-infrared. The output power of the laser is adjustable. The maximum output power of the 450-nanometer wavelength laser selected in this embodiment is 4 watts.

[0059] Furthermore, the optical fiber assembly consists of an optical fiber and its front-end and back-end couplers. The front end of the optical fiber is connected to the laser, and the back end is connected to the optical mirror positioning assembly. The front end of the optical fiber is designed with an insulating cladding, while the insulating layer is removed at the back end, and the diameter is 2 mm to meet the internal space requirements of the probe.

[0060] Exemplarily, as Figure 3 shown, the front-end portion of the optical fiber consists of a bare optical fiber and a cladding, and is equipped with a front-end coupler. For example, it can be connected to the laser through an SMA90 connector port to ensure stable laser output. Since the optical fiber needs to pass through the entire probe, its diameter must be less than 2 mm. Based on this, the back-end portion of the optical fiber in this embodiment is a bare optical fiber without a cladding to facilitate controlling the size of the back end of the optical fiber so that it can extend into the in-situ photocatalytic nuclear magnetic resonance probe.

[0061] Furthermore, the light-emitting end of the optical fiber in this embodiment is equipped with a light-emitting port, and an optical mirror assembly 9 is arranged in front. The light-emitting port is made of a customized non-magnetic material, such as plastic, copper, aluminum, or non-magnetic tungsten steel, etc., to ensure compatibility with the nuclear magnetic resonance instrument. The total length of the optical fiber exceeds 3 meters. The part connected to the laser is provided with a protective sleeve, while the part connected to the nuclear magnetic resonance probe is a bare optical fiber. One end of the optical fiber enters the interior of the nuclear magnetic resonance instrument and is fixed by a customized optical fiber fixing component.

[0062] In addition, the path of the bare optical fiber in the nuclear magnetic resonance probe needs to be precisely designed according to the probe structure, and the port processing is carried out after the optical fiber passes through each part of the probe to ensure the smooth insertion of the optical fiber.

[0063] As another alternative embodiment, to ensure structural stability, in this embodiment, a protective sleeve is sleeved outside the nuclear magnetic resonance probe. For example, it is a non-magnetic metal long cylinder, which is used to lock the probe and all other components to prevent the components from being unstable or falling off during the test.

[0064] This embodiment realizes the real-time nuclear magnetic resonance signal monitoring and detection of liquid samples during the photocatalytic process through an in-situ photocatalytic nuclear magnetic resonance detection device, ensuring the consistency of the chemical reaction environment control. Moreover, by selecting non-magnetic materials, the interference of magnetism on the nuclear magnetic resonance cavity and nuclear magnetic resonance signals can be effectively avoided.

[0065] The above description is only an illustration of the preferred solution and the technical principles applied in this embodiment. Those skilled in the art should understand that the protection scope of the present disclosure is not limited to the combination of the above specific technical features, but should also include other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the present disclosure. For example, a technical solution formed by mutually replacing the above features with technical features having similar functions in the present disclosure.

[0066] In addition, although the operation steps are described in a specific order, it should not be understood as requiring execution in the order shown. In some cases, multitasking and parallel processing may be beneficial. Similarly, although several specific implementation details are included in the discussion, these should not be construed as limitations on the scope of the present disclosure. Some features described in separate embodiments can be combined for implementation, and vice versa.

[0067] Although the subject matter has been described in language specific to structural features and / or method logical actions, it should be understood that the subject matter defined in the claims is not limited to the specific features or actions described above. The specific features and actions described above are only an example form for implementing the claims.

[0068] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions within the essence and protection scope of the present invention, and such modifications or equivalent substitutions should also be regarded as falling within the protection scope of the present invention.

Claims

1. An in-situ transmission focusing photocatalytic nuclear magnetic resonance probe, comprising: Lasers; An optical fiber assembly connected to the laser, wherein the optical fiber assembly comprises an optical fiber; The probe body includes a sample cavity and an electronic radio frequency component. The sample cavity includes a cavity surrounded by the electronic radio frequency component and used to accommodate a sample tube. The probe body also includes a tuning circuit and a probe base. The probe base is coaxially fixedly mounted on the bottom of the radio frequency electronic component. The tuning circuit is located below the probe base. The optical fiber is introduced from the bottom of the probe to the center of the tuning circuit and passes through the tuning circuit to reach the bottom of the probe base. An optical mirror assembly, the optical mirror assembly is located above the tuning circuit, and is used to fix the optical fiber and focus the collimated light source, and the light source focused and collimated by the optical mirror assembly is introduced into the bottom of the sample tube from the through hole of the probe base; The tuning circuit includes a tuning coil, a tuning rod, and a capacitor. The center of the tuning circuit has a cavity that can accommodate a 2mm optical fiber, and a space is reserved above so that the optical mirror assembly can be embedded therein; The in-situ transmission focusing photocatalytic nuclear magnetic resonance probe is used for real-time monitoring and detection of nuclear magnetic signals during the photocatalytic process of a liquid sample.

2. The in-situ transmission focusing photocatalytic nuclear magnetic resonance probe according to claim 1, characterized in that: The internal optical path of the nuclear magnetic resonance probe is of transmission focusing type, and the internal optical path of the nuclear magnetic resonance probe includes: Introducing an optical path at the edge of the nuclear magnetic resonance probe that is independent of the tuning bar and the key probe components of the temperature control device and can accommodate a 2 mm optical fiber; One end of the optical fiber is connected to the laser, and the other end passes through the bottom of the nuclear magnetic resonance probe and passes through the optical path of the inner edge of the nuclear magnetic resonance probe; The light source directly irradiates the sample in the sample tube from the bottom of the sample tube through the optical mirror assembly.

3. The in-situ transmission focusing photocatalytic nuclear magnetic resonance probe according to claim 1, characterized in that: The optical fiber assembly also includes a front-end coupler and a rear-end coupler connected to the front end and the rear end of the optical fiber respectively; The front end of the optical fiber is connected to the laser, and the rear end passes through the bottom of the probe and is connected to the optical mirror component inside the nuclear magnetic resonance probe through the optical path at the inner edge of the nuclear magnetic resonance probe.

4. The in-situ transmission focusing photocatalytic nuclear magnetic resonance probe according to claim 1, characterized in that: The optical mirror assembly comprises an optical mirror positioning assembly, an optical fiber positioning assembly and an optical mirror, wherein the optical mirror is composed of two lenses, which are a convex lens and a concave lens respectively; or The optical mirror is composed of three convex lenses, which are respectively a collecting mirror, an intermediate lens and an output mirror.

5. The in-situ transmission focusing photocatalytic nuclear magnetic resonance probe according to claim 4, characterized in that: The optical mirror positioning assembly comprises a lens barrel for fixing the optical mirror; The optical fiber positioning assembly is located below the optical mirror positioning assembly, and is used to fix the optical fiber and introduce the light source of the optical fiber into the optical mirror assembly. The light source first passes through a convex lens and then through a concave lens, or first passes through a collecting mirror, an intermediate lens, and then through an output mirror to achieve focusing and collimation of the light source.

6. The in-situ transmission focusing photocatalytic nuclear magnetic resonance probe according to claim 4, characterized in that: The optical mirror assembly is located below the probe base and is threadedly connected to the probe base. A through hole is reserved on the probe base so that the light source passing through the optical mirror assembly can be focused and collimated on the bottom of the sample tube through the through hole.

7. The in-situ transmission focusing photocatalytic nuclear magnetic resonance probe according to claim 6, characterized in that: The size of the through hole matches the size of the sample tube, so as to maximize the illumination of the light source through the through hole onto the sample in the sample tube.

8. The in-situ transmission focusing photocatalytic nuclear magnetic resonance probe according to claim 1, characterized in that: There are many types of lasers, and the different types of lasers can respectively provide full-band light sources including ultraviolet light, visible light, and infrared light.

9. A nuclear magnetic resonance spectrometer, characterized in that: It comprises the in-situ transmission focusing photocatalytic nuclear magnetic resonance probe as described in any one of claims 1 to 8.

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