Imaging system suitable for extremely low temperature and strong magnetic field

Abstract

According to the technical scheme, the imaging system suitable for the extremely low temperature and the high-intensity magnetic field comprises a laser source, a light path system, a sample table, an imaging system body, a data processing system, a low-temperature refrigerating system capable of reducing the sample environment temperature to 20 K or below and a high-intensity magnetic field system capable of generating 60 T or below in a sample area. The low-temperature refrigerating system comprises a cooling head in direct contact with the sample table, a temperature sensor for monitoring the temperature in real time and a feedback system for adjusting the temperature, and a cooling system is arranged around the high-intensity magnetic field system. The device can stably operate in an extremely low-temperature environment below 20K through an efficient low-temperature refrigeration system, is suitable for researching low-temperature superconducting materials and quantum materials, can perform Raman and SHG imaging in a high-intensity magnetic field of Newtesla through a high-intensity magnetic field system, is suitable for researching the influence of the high-intensity magnetic field on the materials, and is suitable for research on the research of the high-intensity magnetic field on the materials. Therefore, the magnetic phase change and magneto-optical effect of the material can be revealed under the condition of a strong magnetic field.

Description

Technical Field

[0001] The present invention relates to the field of technical imaging systems, in particular to imaging systems suitable for extremely low temperatures and strong magnetic fields. Background Art

[0002] In scientific research and industrial applications, Raman spectroscopy and second harmonic generation (SHG) imaging are widely used in material analysis and biomedical imaging. Raman spectroscopy uses the interaction between photons and the vibrational modes of material molecules to provide rich molecular structural information, while SHG imaging provides high-resolution structural imaging through nonlinear optical effects. These techniques are usually performed at room temperature and in a low magnetic field environment and have shown high utility for the characterization of most materials.

[0003] Although existing Raman spectroscopy and SHG imaging systems perform well at room temperature and in low magnetic field environments, they have significant deficiencies in the following aspects:

[0004] (1) Temperature limit:

[0005] Existing systems usually operate at room temperature or slightly lower temperatures, making it difficult to conduct experiments in extremely low temperature environments. This limits the research on some low-temperature superconducting materials and quantum materials and makes it impossible to reveal the physical properties of these materials at extremely low temperatures.

[0006] (2) Magnetic field limitation:

[0007] Most existing systems work in low magnetic field environments and cannot perform effective imaging and analysis under strong magnetic field conditions. This poses a huge obstacle to the study of certain physical phenomena and material properties under strong magnetic fields, such as phase changes of magnetic materials and the influence of magnetic fields on material structure.

[0008] (3) System stability:

[0009] In extremely low temperature and strong magnetic field environments, the system's optical path and imaging equipment need to have higher stability and anti-interference capabilities. Existing systems often find it difficult to ensure a stable optical path and high-quality imaging under such extreme conditions. Summary of the invention

[0010] In view of the shortcomings of the prior art, the present invention aims to provide an imaging system suitable for extremely low temperatures and strong magnetic fields.

[0011] In order to achieve the above object, the technical solution of the present invention is as follows:

[0012] An imaging system suitable for extremely low temperatures and strong magnetic fields includes a laser source, an optical path system, a sample stage, an imaging system, a data processing system, a low-temperature refrigeration system that can reduce the sample environment temperature to below 20K, and a strong magnetic field system that can generate below 60T in the sample area. The low-temperature refrigeration system includes a cooling head that directly contacts the sample stage, a temperature sensor that monitors the temperature in real time, and a feedback system for temperature regulation. The strong magnetic field system is equipped with a cooling system around it.

[0013] Preferably, the cryogenic refrigeration system uses liquid helium or closed cycle refrigeration technology or helium-3 refrigeration system or solid-state refrigeration system.

[0014] Preferably, the high magnetic field system integrates an electromagnet or a permanent magnet designed with a superconducting coil or a combination of a superconducting coil and a permanent magnet.

[0015] Preferably, the optical path system adopts a lens and reflector system or an optical fiber optical path system or a total reflector optical path system.

[0016] Preferably, the optical elements in the optical path system are made of low-temperature resistant materials and are designed to reduce thermal expansion effects.

[0017] Preferably, the optical elements in the optical path system include lenses, reflectors and optical fibers. The lens is made of fused silica or calcium fluoride or magnesium fluoride, the reflector is made of single crystal silicon or aluminum, and the optical fiber is made of quartz fiber or plastic fiber.

[0018] Preferably, the bracket and the fixing device of the optical path system are made of low-temperature compatible metal materials, specifically stainless steel or aluminum alloy or titanium alloy, and the optical path system adopts shockproof design and magnetic shielding technology.

[0019] Preferably, the bracket and the fixing device of the optical path system are made of low-temperature compatible non-metallic materials, specifically polytetrafluoroethylene or polyimide or glass fiber reinforced plastic or epoxy resin, and the optical path system adopts shockproof design and magnetic shielding technology.

[0020] Preferably, the imaging system is equipped with a detector and a microscope, the noise equivalent power of the detector is 10^-18 to 10^-15 W / Hz^0.5, and the resolution of the microscope is 0.1-10 nm.

[0021] Preferably, the imaging system uses an infrared detector, a CCD detector, a CMOS detector, or a multi-spectral imaging system.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention can operate stably in an extremely low temperature environment below 20K through an efficient low temperature refrigeration system, and is suitable for studying low temperature superconducting materials and quantum materials, so that the quantum properties and superconducting properties of the materials can be effectively studied in an extremely low temperature environment, thereby making the experimental results more scientifically valuable;

[0024] 2. The present invention can perform Raman and SHG imaging under a strong magnetic field through a strong magnetic field system, which is suitable for studying the influence of a strong magnetic field on a material, thereby revealing the magnetic phase transition and magneto-optical effect of the material under a strong magnetic field condition, thus expanding the application scope of the imaging system;

[0025] 3. The optical path system of the present invention is designed to resist interference from low temperatures and strong magnetic fields, ensuring optical stability in extreme environments, so that the imaging system can still obtain high-quality Raman spectra and SHG images under low temperatures and strong magnetic fields, thereby improving the reliability of the experiment and the accuracy of the data;

[0026] 4. The imaging system of the present invention is equipped with a high-sensitivity detector and a high-resolution microscope, which is suitable for extremely low temperature and strong magnetic field environments, so that clear high-resolution images can still be obtained under extreme conditions, thereby meeting the needs of high-precision scientific research. DETAILED DESCRIPTION

[0027] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the present invention.

[0028] The imaging system of the present invention suitable for extremely low temperatures and strong magnetic fields includes a laser source, an optical path system, a sample stage, an imaging system, a data processing system, a low-temperature refrigeration system and a strong magnetic field system. The laser source is used to provide excitation light, the optical path system is used to focus the laser and collect scattered light, the sample stage is used to place samples and allow experiments to be performed under different temperatures and magnetic fields, the imaging system is used to detect and analyze scattered light or SHG signals, and the data processing system is used to process and analyze the detected signals. After the laser source emits a laser beam of a specific wavelength, the laser beam is focused onto the sample through the optical path system, and the Raman scattered light or SHG signal is generated through the interaction between the sample and the laser, and then the scattered light or SHG signal is collected and transmitted through the optical system, and the imaging system is used to detect and analyze the signal.

[0029] The cryogenic refrigeration system uses liquid helium or closed-cycle refrigeration technology or helium-3 refrigeration system or solid-state refrigeration system, including a cooling head, a temperature sensor and a feedback system. The cooling head directly contacts the sample stage to keep the sample stable in an extremely low temperature environment. The temperature sensor monitors the temperature in real time and adjusts it through the feedback system to ensure precise temperature control. The sample environment temperature is reduced to below 20K through liquid helium or closed-cycle refrigeration technology. A lower temperature can be achieved through a helium-3 refrigeration system, which is suitable for experiments requiring an extremely low temperature environment. Solid-state refrigeration technology, such as a pulse tube refrigerator, is used to reduce the use of refrigerants. The pulse tube refrigerator achieves low-temperature refrigeration by compressing and expanding gases. The system design includes a compressor, a cooling head and a control circuit to ensure that the sample remains stable in a low-temperature environment. The cryogenic refrigeration system is suitable for studying low-temperature superconducting materials and quantum materials, so that the quantum properties and superconducting properties of the material can be effectively studied under an extremely low temperature environment, thereby making the experimental results more scientifically valuable.

[0030] The strong magnetic field system integrates electromagnets or permanent magnets designed with superconducting coils or a combination of superconducting coils and permanent magnets. By integrating high-strength electromagnets, a magnetic field of up to 60 Tesla can be generated in the sample area. The electromagnets are designed with superconducting coils to reduce energy loss and increase magnetic field strength. An efficient cooling system is equipped around the coils to prevent overheating. The magnetic field strength is adjusted by controlling the current size, and the magnetic field direction is controlled by changing the direction of the coil current. A high-strength stable magnetic field can be provided by permanent magnets. The permanent magnets are installed around the sample area. By adjusting the arrangement and position of the permanent magnets, magnetic fields of different strengths and directions can be achieved. A hybrid magnet system is used to combine superconducting coils and permanent magnets to provide a higher intensity magnetic field. A stable high-intensity magnetic field is generated through the combined action of superconducting coils and permanent magnets. The superconducting coils are equipped with a cooling system, and the permanent magnets provide additional magnetic field strength to improve the overall performance of the system. The strong magnetic field system can perform Raman and SHG imaging under strong magnetic fields, which is suitable for studying the influence of strong magnetic fields on materials, thereby revealing the magnetic phase transition and magneto-optical effect of materials under strong magnetic field conditions, expanding the application range of the imaging system.

[0031] The optical system adopts a special design that is resistant to low temperature and strong magnetic field interference, ensuring stability and imaging quality under extreme conditions. The optical elements in the optical system are made of low-temperature resistant materials. The optical elements include lenses, reflectors and optical fibers. The lens is made of fused quartz or calcium fluoride or magnesium fluoride, the reflector is made of single crystal silicon or aluminum, and the optical fiber is made of quartz fiber or plastic fiber. The design reduces the effect of thermal expansion. The brackets and fixtures of the optical system are made of low-temperature compatible materials, including low-temperature compatible metal materials and low-temperature compatible non-metal materials. Low-temperature compatible metal materials include stainless steel (304 stainless steel, 31 6 stainless steel), aluminum alloy (6061-T6 aluminum alloy, 6061-T6 aluminum alloy), titanium alloy, low-temperature compatible non-metallic materials include polytetrafluoroethylene, polyimide, glass fiber reinforced plastic, epoxy resin to ensure the stability of the optical path, the optical path system adopts shockproof design and magnetic shielding technology to reduce the interference of environmental vibration and magnetic field on the optical path, and adopts optical elements of low-temperature resistant materials and brackets and fixtures of low-temperature compatible materials, as well as shockproof design and magnetic shielding technology to reduce the interference of environmental vibration and magnetic field on the optical path, thereby ensuring the stability of the optical path and imaging quality under extreme conditions, improving the reliability of the experiment and the accuracy of the data.

[0032] The optical path system adopts a lens and reflector system or a fiber optic optical path system or a total reflector optical path system. As a traditional optical path system, the lens and reflector system has high stability. Using a fiber optic optical path instead of a traditional lens and reflector system can transmit the laser to the sample area through the optical fiber, and the scattered light or SHG signal is collected and transmitted to the detector through the optical fiber. In addition, the fiber optic optical path system has strong anti-interference ability and flexibility, and is suitable for extremely low temperature and strong magnetic field environments. The total reflector optical path system is mainly composed of high-reflectivity reflectors, and laser focusing and signal collection are achieved through the precise arrangement of reflectors. The reflector system reduces the influence of lens materials on low temperature and magnetic fields, and improves the stability of the optical path.

[0033] The imaging system is equipped with a detector and a microscope. The noise equivalent power of the detector is 10^-18 to 10^-15W / Hz^0.5. The resolution of the microscope is 0.1-10nm, which is suitable for extremely low temperature and strong magnetic field environments. The imaging system adopts a low-noise CCD or CMOS detector or an infrared detector or a multi-spectral imaging system. The low-noise CCD or CMOS detector can obtain clear images under weak signals. The microscope adopts a design compatible with low temperature and strong magnetic fields, and the optical path is optimized to maximize the signal collection efficiency. It can obtain high-quality Raman spectra and SHG images in extremely low temperature and strong magnetic field environments to meet the needs of high-precision scientific research. The image processing software integrates temperature and magnetic field correction algorithms to improve imaging accuracy, and uses infrared detectors instead of CCD or CMOS detectors. The detector can improve the sensitivity under low temperature conditions. The infrared detector can provide higher sensitivity under low temperature conditions and is suitable for the detection of weak signals. Moreover, the infrared detector used in combination with a microscope and a spectrometer can improve the effects of imaging and spectral analysis. The multi-spectral imaging system can simultaneously acquire Raman spectra and SHG images. The multi-spectral imaging system combines multiple detectors and spectrometers to simultaneously acquire multiple spectral information of the sample, integrating Raman spectroscopy and SHG imaging functions. The highly integrated design of the optical path and imaging system simplifies the experimental operation process and improves the efficiency of the system, thereby providing a more comprehensive material analysis capability and providing a powerful tool for scientific research and industrial applications. The system design includes optical path separation and signal synchronization processing to improve the efficiency of imaging and analysis.

[0034] Through the various alternative solutions mentioned above, under different implementation methods, it is still possible to provide efficient and stable imaging and analysis capabilities under extremely low temperatures and strong magnetic fields. The alternative solutions not only expand the scope of application of the system, but also increase the flexibility and maintainability of the system, and further improve the practicality and reliability of the system. These alternative solutions ensure that high performance can be maintained in different application scenarios, providing broader scientific research and industrial application support.

[0035] The technical scope of the present invention is not limited to the contents in the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. Imaging system suitable for extremely low temperature and strong magnetic field, Features: It includes a laser source, an optical path system, a sample stage, an imaging system, a data processing system, a low-temperature refrigeration system that can reduce the sample environment temperature to below 20K, and a strong magnetic field system that can generate below 60T in the sample area. The low-temperature refrigeration system includes a cooling head that directly contacts the sample stage, a temperature sensor that monitors the temperature in real time, and a feedback system for temperature regulation. The strong magnetic field system is equipped with a cooling system around it.

2. The imaging system suitable for extremely low temperatures and strong magnetic fields according to claim 1, Features: The low temperature refrigeration system adopts liquid helium or closed cycle refrigeration technology or helium-3 refrigeration system or solid state refrigeration system.

3. The imaging system suitable for extremely low temperatures and strong magnetic fields according to claim 2, Features: The high magnetic field system integrates an electromagnet or a permanent magnet designed with a superconducting coil or a combination of a superconducting coil and a permanent magnet.

4. The imaging system suitable for extremely low temperatures and strong magnetic fields according to claim 1, Features: The optical path system adopts a lens and reflector system or an optical fiber optical path system or a total reflector optical path system.

5. The imaging system suitable for extremely low temperatures and strong magnetic fields according to claim 4, Features: The optical elements in the optical path system are made of low-temperature resistant materials and are designed to reduce thermal expansion effects.

6. The imaging system suitable for extremely low temperatures and strong magnetic fields according to claim 5, Features: The optical elements in the optical path system include lenses, reflectors and optical fibers. The lens is made of fused silica or calcium fluoride or magnesium fluoride, the reflector is made of single crystal silicon or aluminum, and the optical fiber is made of quartz fiber or plastic fiber.

7. The imaging system suitable for extremely low temperatures and strong magnetic fields according to claim 6, Features: The bracket and the fixing device of the optical path system are made of low-temperature compatible metal materials, specifically stainless steel or aluminum alloy or titanium alloy, and the optical path system adopts shockproof design and magnetic shielding technology.

8. The imaging system suitable for extremely low temperatures and strong magnetic fields according to claim 6, Features: The bracket and the fixing device of the optical path system are made of low-temperature compatible non-metallic materials, specifically polytetrafluoroethylene or polyimide or glass fiber reinforced plastic or epoxy resin, and the optical path system adopts shockproof design and magnetic shielding technology.

9. The imaging system suitable for extremely low temperatures and strong magnetic fields according to claim 7 or 8, Features: The imaging system is equipped with a detector and a microscope, the noise equivalent power of the detector is 10^-18 to 10^-15 W / Hz^0.5, and the resolution of the microscope is 0.1-10 nm.

10. The imaging system suitable for extremely low temperatures and strong magnetic fields according to claim 9, Features: The imaging system adopts an infrared detector, a CCD detector, a CMOS detector or a multi-spectral imaging system.