In-situ transmission focusing type photocatalytic nuclear magnetic resonance probe and nuclear magnetic resonance spectrometer

Abstract

The embodiment of the invention provides an in-situ transmission focusing type photocatalytic nuclear magnetic resonance probe and a nuclear magnetic resonance spectrometer. The nuclear magnetic resonance probe comprises a probe main body, a laser and an optical fiber assembly, the probe main body comprises a sample cavity and an electronic radio frequency element, and the sample cavity comprises a cavity formed by encircling the electronic radio frequency element and is used for accommodating a sample tube; the optical fiber assembly comprises an optical fiber; the probe main body further comprises a tuning circuit and a probe base; the probe base is coaxially and fixedly mounted at the bottom of the electronic radio frequency element; the tuned circuit is located below the probe base, and the optical fiber is led to the position above the tuned circuit from the bottom of the probe; the light mirror assembly is positioned above the tuning circuit and is used for fixing the optical fiber and introducing a light source into the light mirror assembly, and the light source collimated and focused by the light mirror assembly is introduced into the bottom of the sample tube from the through hole of the probe base, so that in-situ photocatalysis is realized.

Description

Technical Field

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

[0002] In situ Nuclear Magnetic Resonance (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, because photocatalysis is a process that uses light energy to drive chemical reactions and is widely used in organic synthesis, environmental purification, energy conversion and other fields.

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

[0004] The advantage of in-situ NMR technology is that it can monitor chemical changes in the reaction process in real time without interfering with the reaction system. By measuring 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. These data help to reveal the mechanism of photocatalytic reactions, including processes such as electron transfer, energy transfer and the formation and breaking of chemical bonds.

[0005] In addition, in situ NMR can be combined with other characterization techniques, such as UV-Vis spectroscopy, fluorescence spectroscopy, and electrochemical methods, to obtain more comprehensive information about the photocatalytic reaction. This multi-technical approach can provide a deeper understanding and help optimize the design of photocatalytic materials and improve 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. Because in-situ nuclear magnetic signal detection technology plays an increasingly important role in the study of photocatalytic reactions, the current application of nuclear magnetic resonance spectrometers in the field of photocatalytic research is limited by the photocatalytic devices built by users themselves, which generally lack key performance such as high power, high stability and wavelength selectivity. Therefore, there is an urgent need to develop an in-situ NMR system with a simplified structure, efficient operation and user-friendly to promote in-depth exploration of the mechanism of photocatalytic reactions.

[0007] However, NMR technology itself is a highly sensitive physical analysis method that relies on the resonance phenomenon of atomic nuclei in samples in strong magnetic fields. Combining the photocatalytic process with NMR technology requires solving multiple technical problems. First, photocatalytic reactions usually require illumination of a specific wavelength, and the magnetic field environment of the NMR equipment has strict requirements on the propagation of light and the illumination conditions of the sample. Secondly, the detection of intermediate states and transient species produced by photocatalysis requires high-time resolution NMR technology, 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 technology mostly uses the modification of nuclear magnetic tubes, such as introducing light sources through optical fibers and LEDs. Although this method is low-cost, it has problems with insufficient illumination intensity and uniformity, which directly affects the photocatalytic efficiency and the accuracy of NMR signals. Summary of the invention

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

[0009] First, a probe with an internal structure with greater design flexibility is selected. The internal structure of the probe is adjusted through design, especially the structure of the tuning circuit under the probe base. By adjusting and optimizing the structure of the tuning circuit, sufficient space is left in the center of the probe to provide sufficient space for embedding optical components and optical fibers inside the probe. Secondly, a "transmission focusing type" solution is selected in the optical path design inside the probe. The optical fiber is introduced into the space inside the center of the tuning circuit, passes through the tuning circuit, and is introduced to the bottom of the probe base. It is introduced into the optical microscope positioning assembly through the optical fiber positioning assembly, thereby realizing the focusing and collimation of the light source. The light source passing through the optical microscope assembly passes through the through hole of the probe base and directly irradiates the sample in the sample tube, thereby initiating a photocatalytic reaction. Finally, the probe is placed in a high-field magnet and combined with a control cabinet, a data acquisition unit, etc., to monitor the progress of the photocatalytic reaction in real time, and to conduct efficient photocatalytic reaction mechanism and kinetics research under in situ conditions.

[0010] This application designs a "transmission focusing type" light source input system for the probe, and introduces an independent "transmission focusing type" light source introduction system, so that it can not only retain the original function, but also have the ability to carry out in-situ photocatalytic reactions and detect nuclear magnetic resonance signals of photocatalytic products.

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

[0012] A probe body, a laser and an optical fiber assembly; the probe body comprises: a sample cavity, an electronic radio frequency element, the sample cavity comprises a cavity formed by the electronic radio frequency element surrounding it, and is used to accommodate a sample tube; the optical fiber assembly comprises an optical fiber; the probe body also comprises a tuning circuit and a probe base, and the probe base is coaxially fixedly mounted on the bottom of the radio frequency electronic element; the tuning circuit is located below the probe base, and 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 to the bottom of the probe base; the optical mirror assembly is located above the tuning circuit, and is used to fix the optical fiber and introduce the light source into the optical mirror assembly, and the light source focused and collimated by the optical mirror assembly is introduced from the through hole of the probe base into the bottom of the sample tube, irradiates the sample, and then realizes 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 tuning circuit has a cavity in the center that can accommodate a 2 mm optical fiber, and sufficient space is reserved above so that the optical mirror assembly can be embedded therein.

[0014] In some embodiments, the internal optical path of the nuclear magnetic resonance probe is of a transmission focusing type, including introducing an optical path at the edge position inside the nuclear magnetic resonance probe that is independent of the key components of the probe, such as the tuning bar and 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 the optical path at the inner edge of the nuclear magnetic resonance probe. The light source input into 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 optical fiber assembly also includes a front-end coupler and a rear-end coupler respectively connected to the front and rear ends 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 inner 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 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 light beam after passing through the convex lens, and then the concave lens diverges the light passing through the convex lens. The combination of the two lenses makes the light form a parallel or nearly parallel light 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] The optical mirror is further composed of three convex lenses, namely, a collecting mirror, an intermediate lens, and an output mirror. The collecting mirror is close to the light source emitted by the optical fiber, collects the light from the optical fiber, and focuses or collimates it. The intermediate lens is located between the collecting mirror and the output mirror, and is used to further adjust the focusing state and spot size of the light. The output mirror is located above the intermediate lens, close to the probe base. After the light passes through the output mirror, 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 mirror positioning assembly includes 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 passes through the optical mirror in turn, thereby achieving focusing and collimation of the light source.

[0020] In other embodiments, 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 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's illumination through the through hole onto the sample in the sample tube.

[0022] In some embodiments, the in-situ photocatalytic nuclear magnetic resonance probe is covered 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, comprising the above-mentioned in-situ transmission focusing photocatalytic nuclear magnetic resonance probe.

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

[0027] In some embodiments, the nuclear magnetic resonance spectrometer can conduct photocatalytic reaction mechanism and kinetics research under in-situ conditions through real-time monitoring by a data acquisition system and a nuclear magnetic temperature variable system.

[0028] In addition, although the fiber optic assembly and the optical mirror assembly are optimized according to the designed internal structure and space size of the probe, for probes with simple internal structure and larger space, the size and shape of the fiber optic assembly and the optical mirror assembly can also be customized and optimized according to actual needs to make them suitable for different types of probes.

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

[0030] Furthermore, 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 exhibited by the embodiments of the present invention include:

[0032] (1) The present invention adjusts the structure inside the probe by design, so that there is enough space inside the probe to accommodate the optical mirror assembly and the optical fiber, so that the light source can stably irradiate the sample tube and evenly irradiate the sample. This not only ensures the close combination of the optical assembly and the probe, but also maximizes the sensitivity and accuracy of in-situ photocatalytic nuclear magnetic resonance detection, thereby providing a new technical means for studying the mechanism and kinetics of photocatalytic reactions under in-situ conditions. In addition, the assembly is easy to disassemble, leaving space 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 nuclear magnetic resonance probe, which can provide a full-band, high-intensity uniform light source, so that it has the ability to perform in-situ photocatalytic reactions and detect nuclear magnetic resonance signals of photocatalytic products.

[0034] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

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

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. When appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present device or method. In the drawings:

[0037] Figure 1 Schematic diagram of the structure of an in-situ transmission focusing photocatalytic nuclear magnetic resonance probe in an embodiment of the present invention.

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

[0039] Figure 3 It is a schematic diagram of a part of the structure of the optical fiber in the embodiment of the present invention.

[0040] Reference numerals:

[0041] 1-probe body, 2-laser, 3-optical fiber assembly, 4-electronic radio frequency component, 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 DESCRIPTION

[0042] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but are not intended to limit the present invention.

[0043] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the following description should not be considered as limiting, but merely as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0044] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate 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, serve to explain the principles of the present disclosure.

[0045] These and other characteristics of the invention will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the accompanying drawings.

[0046] It should also be understood that, although the invention has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the invention that have the characteristics recited in the claims and are therefore within the scope of protection defined thereby.

[0047] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0048] Specific embodiments of the present disclosure are 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 may be implemented in a variety of ways. Well-known and / or repeated 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 merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of ways with substantially any suitable detailed structure.

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

[0050] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0051] like Figure 1 , Figure 2 , Figure 3 As shown, an embodiment of the present invention provides an in-situ transmission focusing photocatalytic nuclear magnetic resonance probe, comprising:

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

[0053] The optical mirror assembly 9 includes a lens barrel and an optical mirror, and the optical mirror is composed of a collecting mirror, an intermediate lens, and an output mirror from top to bottom. The optical fiber positioning assembly is located below the optical mirror positioning assembly, and is used to fix the optical fiber and introduce the optical fiber light source into the optical mirror assembly. The light source first passes through the collecting mirror, 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 optical mirror is introduced to the bottom of the sample tube 6 through the through hole 8 of the probe base 7, thereby realizing in-situ photocatalysis.

[0054] The 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 that can accommodate a 2 mm optical fiber so that the optical fiber can pass through it. Sufficient space is reserved above the tuning circuit 10 so that the optical mirror assembly 9 can be embedded therein.

[0055] The optical mirror assembly 9 is finely processed by non-magnetic materials to accurately position the optical mirror at the center of the probe (NMR probe). The diameter of the through hole 8 matches the diameter of the NMR tube to ensure that the light source is evenly irradiated from all areas of the bottom of the sample tube.

[0056] In addition, an embodiment of the present invention also provides a nuclear magnetic resonance spectrometer, including the above-mentioned in-situ transmission focusing photocatalytic nuclear magnetic resonance probe, as well as a magnet, a control cabinet and a real-time nuclear magnetic resonance signal acquisition unit, so as to obtain 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 collect nuclear magnetic resonance signals in real time, providing a new technical means for studying the mechanism and kinetics of photocatalytic reactions. The probe of this embodiment combines the optical path construction technology and nuclear magnetic resonance technology. The former is responsible for accurately guiding the laser into the nuclear magnetic tube to trigger the photocatalytic reaction, and the latter monitors the changes in chemical composition in a superconducting magnetic field environment.

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

[0059] Furthermore, the optical fiber assembly is composed of an optical fiber and its front-end and rear-end couplers, wherein the front end of the optical fiber is connected to the laser, and the rear end is connected to the optical microscope positioning assembly. The front end of the optical fiber is designed with an insulating cladding, while the rear end is free of the insulating layer, and the diameter is 2 mm to meet the internal space requirements of the probe.

[0060] For example, Figure 3 As shown, the front end of the optical fiber is composed of a bare optical fiber and a cladding, and is equipped with a front end coupler, which can be connected to the laser through an SMA90 connector port, for example, 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 rear end of the optical fiber in this embodiment is a bare optical fiber without a cladding, so as to control the size of the rear end of the optical fiber so that it can be inserted into the in-situ photocatalytic nuclear magnetic resonance probe.

[0061] Furthermore, the light output end of the optical fiber in this embodiment is equipped with a light output port, and a light mirror assembly 9 is arranged in front. The light output port is made of customized non-magnetic materials, such as plastic, copper, aluminum or non-magnetic tungsten steel, to ensure compatibility with nuclear magnetic resonance instruments. The total length of the optical fiber exceeds 3 meters, of which the part connected to the laser is provided with a protective cover, and 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 assembly.

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

[0063] As another optional embodiment, to ensure structural stability, in this embodiment, a protective sleeve is provided on the outer periphery of the nuclear magnetic resonance probe, such as a non-magnetic metal long cylinder, which is used to lock the probe and all other components to prevent the components from becoming unstable or falling off during the test.

[0064] This embodiment uses an in-situ photocatalytic nuclear magnetic resonance detection device to achieve real-time nuclear magnetic signal monitoring and detection of liquid samples during the photocatalytic process, ensuring the consistency of chemical reaction environment control. In addition, 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 explanation of the preferred solution of this embodiment and the technical principle used. Those skilled in the art should understand that the protection scope of the present disclosure is not limited to the combination of the above-mentioned specific technical features, but should also include other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the concept of the present disclosure. For example, the above-mentioned features are replaced with technical features with similar functions in the present disclosure to form a technical solution.

[0066] In addition, although each operation step is described in a specific order, it should not be understood that it is required to be performed in the order shown. In some cases, multitasking and parallel processing may be beneficial. Similarly, although some specific implementation details are included in the discussion, these should not be interpreted as limiting the scope of the present disclosure. Certain features described in separate embodiments can be implemented in combination, and vice versa.

[0067] Although the subject matter has been described in language specific to structural features and / or methodological logical acts, it should be understood that the subject matter defined in the claims is not limited to the specific features or acts described above. The specific features and acts described above are merely an example form of 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 may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall 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 is located above the tuning circuit and is used to fix the optical fiber and focus the collimated light source. The collimated light source focused by the optical mirror assembly is introduced into the bottom of the sample tube from the through hole of the probe base.

2. The in-situ transmission focusing photocatalytic nuclear magnetic resonance probe according to claim 1, characterized in that: The tuning circuit comprises a tuning coil, a tuning rod and a capacitor. The center of the tuning circuit has a cavity capable of accommodating a 2mm optical fiber, and a space is reserved above so that the optical mirror assembly can be embedded therein.

3. 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 probe is of transmission focusing type, and the internal optical path of the nuclear magnetic probe includes: An optical path which is independent of the tuning bar and the key probe components of the temperature control device and can accommodate a 2 mm optical fiber is introduced at the edge of 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 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.

4. 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.

5. 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.

6. The in-situ transmission focusing photocatalytic nuclear magnetic resonance probe according to claim 5, 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.

7. The in-situ transmission focusing photocatalytic nuclear magnetic resonance probe according to claim 5, 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.

8. The in-situ transmission focusing photocatalytic nuclear magnetic resonance probe according to claim 7, 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.

9. 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.

10. 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 9.

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