A simulation optimization design method for a monitoring probe with high and low temperature characteristics and a clamp thereof

Abstract

The present application relates to the field of monitoring probe and clamp simulation optimization design, in particular to a kind of simulation optimization design method of monitoring probe and clamp with high-low temperature characteristics.The structure of current monitoring probe includes special magnetic core with wide temperature range adaptability, monitoring probe cavity, magnetic core winding structure and N-type connector, the special magnetic core refers to the magnetic core material that keeps non-zero magnetic permeability under high temperature working condition, to ensure that current monitoring probe has stable electromagnetic monitoring capability in the wide temperature range of-40 DEG C to +40 DEG C;The shell design of current monitoring probe follows the principle of minimum adaptation, for the magnetic core winding, the number of turns and arrangement mode parameters of magnetic core winding are iteratively optimized using electromagnetic simulation software;Monitoring probe clamp is composed of two side clamps, openable upper cover, lower fixed base, center conductor and left and right N-type connector input components.The present application is suitable for simulation optimization of monitoring probe and clamp.

Description

Technical Field

[0001] This invention relates to the field of simulation optimization design of monitoring probes and fixtures, and specifically to a simulation optimization design method for a monitoring probe and its fixture with high and low temperature characteristics. Background Technology

[0002] With the widespread adoption of 5G communication technology and the exponential increase in component integration, electromagnetic interference (EMI) and its resulting electromagnetic compatibility (EMC) issues have become core challenges restricting the reliability of electronic systems. In the technological evolution towards miniaturization and higher frequency of components, EMI significantly affects the performance of electronic devices through conduction or spatial radiation. Especially in safety-critical fields such as autonomous driving, it can trigger a chain of safety risks, from sensor failure to control link collapse, and has become a technological bottleneck that urgently needs to be overcome.

[0003] As a core tool for electromagnetic interference diagnosis, the performance limits of current monitoring probes directly determine the accuracy and scenario coverage of system electromagnetic compatibility verification. However, existing technologies suffer from three major contradictions: First, domestic high-frequency current sensors generally use non-dedicated magnetic materials, resulting in low transfer impedance in the 0.3-400MHz frequency range, leading to low sensitivity and limited effective monitoring bandwidth. Second, imported probes generally have transfer impedances below 20dBΩ, making them prone to missed detections in high-current (>100A) or weak signal detection scenarios, with a false alarm rate as high as 15%. Third, traditional probe designs are only optimized for room temperature environments. When the operating temperature exceeds the -40℃ to 40℃ range, the characteristics of the magnetic core material undergo nonlinear changes, causing monitoring errors to exceed the industry standard allowable range.

[0004] Especially with the expansion of autonomous driving technology into extreme environments, vehicle electronic systems must withstand the dual challenges of high engine compartment temperatures (>40℃) and low northern winter temperatures (-30℃). Existing probes exhibit significant performance drift under alternating temperature conditions: high temperatures cause a 40% decrease in magnetic permeability, while low temperatures lead to a 25% increase in remanence, both resulting in distorted monitoring signals. This technological gap creates a major blind spot in electromagnetic compatibility verification for fields such as new energy vehicles and aerospace. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a simulation optimization design method for a monitoring probe and its fixture with high and low temperature characteristics. This method achieves stable output of high frequency permeability over an ultra-wide temperature range and effectively solves the monitoring distortion problem caused by nonlinear changes in magnetic core characteristics under extreme temperature conditions.

[0006] The present invention achieves the above objectives by adopting the following technical solution: The present invention provides a simulation optimization design method for a monitoring probe and its fixture with high and low temperature characteristics. The monitoring device includes a current monitoring probe and a monitoring probe fixture for testing the performance of the current monitoring probe. The simulation optimization design method for the monitoring device includes:

[0007] First, determine the dimensions of the current monitoring probe. Then, based on the dimensions of the current monitoring probe, simulate and design the current monitoring probe fixture to verify the performance of the designed current monitoring probe.

[0008] The current monitoring probe structure includes a special magnetic core with wide temperature range adaptability, a monitoring probe cavity, a magnetic core winding structure, and an adaptable N-type connector. The special magnetic core refers to a magnetic core material that maintains non-zero permeability under high temperature conditions, ensuring that the current monitoring probe has stable electromagnetic monitoring capabilities in a wide temperature range from -40℃ to +40℃.

[0009] The housing design of the current monitoring probe follows the principle of minimization and adaptation, that is, while ensuring reliable embedding of the magnetic core, the housing size is greatly reduced through structural optimization, thereby improving the fit between the probe and the cable and its portability.

[0010] For the magnetic core winding, electromagnetic simulation software was used to iteratively optimize the parameters of the number of turns and the arrangement of the magnetic core winding.

[0011] The monitoring probe clamp consists of two side clamps, an openable upper cover, a lower fixed base, a central conductor, and N-type connectors on both sides. The N-type connectors are connected to the clamp body via retainers. During the clamp design, the impedance of the first coaxial structure formed by the central conductor and the N-type connector base is optimized. The impedance characteristics of this first coaxial structure are quantitatively controlled using the following formula:

[0012]

[0013] In the formula, The relative permittivity of the filler material between the center conductor and the N-type connector base. The angle between the horizontal centerline of the central conductor and the cut-off portion of the conductor. Z represents the angle between the center line of the center conductor and the base of the N-type connector, and Z represents the impedance of the first coaxial structure.

[0014] By adjusting the relative permittivity of the filling material and the two included angles, the impedance of the coaxial structure can be controlled, ultimately achieving matching with the impedance set at the input end.

[0015] Furthermore, after the current monitoring probe is loaded into the fixture, a second coaxial structure is formed between the inner wall of the current monitoring probe and the central conductor. This second coaxial structure can be quantitatively analyzed using the following formula:

[0016]

[0017] In the formula, and These are the permeability and relative permittivity of the medium filling the space between the center conductor and the inner wall of the current monitoring probe, respectively; r is the inner diameter of the current monitoring probe; and d is the diameter of the center conductor.

[0018] By adjusting the parameters of the filling medium material and the structural dimensions, impedance co-optimization between the second coaxial structure and the first coaxial structure is achieved.

[0019] Furthermore, when the impedance of the coaxial structure formed by the inner wall of the current monitoring probe and the central conductor is simultaneously designed to be 50 ohms, the magnetic permeability of the filling medium can be adjusted. With dielectric constant By combining the geometric relationship between the probe inner diameter r and the central conductor diameter d, the structural parameters that meet the impedance matching requirements are calculated, thereby completing the multi-level impedance coordinated design of the monitoring device.

[0020] The beneficial effects of this invention are as follows:

[0021] This invention breaks through the performance limitations of traditional probes that are only suitable for room temperature environments. It adopts a novel composite magnetic core technology of nanocrystalline alloy and polymer substrate to achieve stable output of high frequency permeability in an ultra-wide temperature range (-40℃ to 40℃), effectively solving the monitoring distortion problem caused by nonlinear changes in magnetic core characteristics under extreme temperature environments.

[0022] This invention employs an innovative multi-layer spiral winding process and significantly improves signal conversion capability through optimized electromagnetic coupling efficiency design, thereby greatly reducing the false alarm rate and missed alarm rate in scenarios with strong current or weak signals. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the current monitoring probe fixture provided by the present invention;

[0024] Figure 2 This is a cross-sectional view of the overall model of the monitoring device with a current monitoring probe provided by the present invention;

[0025] Figure 3 This is an internal structure diagram of the current monitoring probe provided by the present invention;

[0026] Figure 4 This is a three-dimensional model of the monitoring device with a current monitoring probe provided by the present invention.

[0027] Figure 5 This is a schematic diagram of the standing wave ratio of the current monitoring probe clamp provided by the present invention;

[0028] Figure 6This is a schematic diagram of the insertion loss of the overall model of the monitoring device with a current monitoring probe provided by the present invention at different temperatures.

[0029] Figure 7 This is a schematic diagram of the standing wave ratio of the overall model of the monitoring device with a current monitoring probe provided by the present invention at different temperatures.

[0030] In the attached diagram, 1 represents the openable upper cover, 2 represents the right side clamp, 3 represents the N-type connector base, 4 represents the N-type connector, 5 represents the fixed base, 6 represents the center conductor, 7 represents the current monitoring probe, 8 represents the coupling gap, 9 represents the current monitoring probe winding, 10 represents the current monitoring probe housing, and 11 represents the current monitoring probe clamp body. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] The high and low temperature characteristic monitoring device of the present invention includes a current monitoring probe and a monitoring probe clamp for testing the performance of the current monitoring probe. Its design concept is as follows:

[0033] The purpose of current monitoring probe clamps is to perform performance testing on designed current monitoring probes. Current monitoring probe clamps play a key role in electromagnetic interference monitoring. Their core functions include: achieving precise fixation and non-contact tight coupling of the conductor under test through mechanical structures (such as U-shaped magnetic cores, slider designs, or flexible Rogowski coils), ensuring signal transmission stability; improving electromagnetic coupling efficiency and signal conversion capabilities through optimized designs such as three-dimensional spiral winding, significantly reducing the false alarm and missed alarm rates in high current or weak signal scenarios; and maintaining stable permeability in extreme temperature environments (such as -40℃ to 40℃) in conjunction with nanocrystalline alloy composite magnetic cores. The split-core design and non-contact measurement method improve operational convenience and safety, allowing for quick adaptation to different scenarios without disconnecting the circuit.

[0034] During the design process, the dimensions of the current monitoring probe are first determined. Then, based on the dimensions of the current monitoring probe, the current monitoring probe fixture is designed using simulation to verify the performance of the designed current monitoring probe.

[0035] like Figure 3 As shown, the current monitoring probe with high and low temperature characteristics described in this invention has a core structure comprising a special magnetic core with wide temperature range adaptability, a precision-machined monitoring probe cavity, an optimized magnetic core winding structure, and an adaptable N-type connector (N-head).

[0036] In the design process, the selection of the magnetic core material is crucial to determining the high-temperature performance of the current monitoring probe. Traditional magnetic cores are prone to a sharp drop in permeability, even approaching zero, under high-temperature conditions, leading to electromagnetic conversion failure. Therefore, this invention innovatively employs a special magnetic core material that maintains non-zero permeability under high-temperature conditions, ensuring stable electromagnetic monitoring capabilities across a wide temperature range of -40℃ to +40℃, effectively solving the technical bottleneck of monitoring failure under high-temperature environments.

[0037] The optimized design of the current monitoring probe housing 10 follows the principle of "minimum fit"—while ensuring reliable embedding of the magnetic core, the size of the current monitoring probe housing 10 is significantly reduced through structural optimization, improving the fit and portability of the current monitoring probe and cable, thereby better adapting to field application scenarios.

[0038] The design of the current monitoring probe winding 9 has a significant impact on the probe's insertion loss. To balance loss characteristics and monitoring sensitivity, this invention uses electromagnetic simulation software to iteratively optimize key parameters such as the number of turns and their arrangement, ultimately achieving an efficient match between the winding structure and the core performance. Furthermore, considering that the monitoring probe is a relatively large RF testing accessory, its input port needs to accommodate both high power handling capacity and low-frequency band compatibility; therefore, an N-type connector is selected. This type of connector not only has a highly compatible size with the probe structure but also meets the requirements for signal transmission stability in electromagnetic susceptibility monitoring scenarios, achieving a dual adaptation of function and structure.

[0039] In summary, this invention, through innovation in magnetic core materials, compact structural design, and scenario-specific connector selection, constructs a current monitoring probe that combines wide temperature range adaptability, high sensitivity, and practicality, providing a key technical solution for precision current monitoring in complex environments.

[0040] like Figure 1 and Figure 2 As shown, the current monitoring probe clamp of this invention consists of two side clamps, an openable upper cover 1, a lower fixed base 5, a central conductor 6, and N-type connectors 4 on the left and right sides. The N-type connectors 4 are connected to the fixed base 5 via a dedicated fastener, achieving a stable connection with the clamp body 11. The core optimization goal of the clamp design focuses on efficient transmission matching of radio frequency signals. Given that the standard impedance of the input N-type connector is 50 ohms, the coaxial structure formed by the central conductor and the two side clamps needs to achieve precise matching with the input impedance to ensure reflection-free signal transmission. Therefore, the clamp design needs to optimize the impedance of the coaxial structure formed by the central conductor and the N-type connector base, designing its characteristic impedance to be 50 ohms. The impedance characteristics of this coaxial structure can be quantitatively controlled using the following formula:

[0041]

[0042] In the formula, The relative permittivity of the filler material between the center conductor and the N-type connector base. The angle between the horizontal centerline of the central conductor and the cut-off portion of the conductor. The angle between the center line of the center conductor and the base of the N-type connector.

[0043] By adjusting the dielectric constant of the material and two key angle parameters, precise control of the coaxial structure impedance can be achieved, ultimately achieving a perfect match with the 50-ohm impedance at the input end, thereby optimizing the signal transmission performance of the entire monitoring device.

[0044] When the characteristic impedance Z is set to 50 ohms, the key included angle parameter of the center conductor can be deduced using the above formula, thereby completing the impedance matching design between the center conductor and the N-type connector base. Furthermore, after the current monitoring probe is mounted on the fixture, another coaxial transmission structure is formed between its inner wall and the center conductor. The impedance characteristics of this structure can be quantitatively analyzed using the following formula:

[0045]

[0046] In the formula, and Here, represents the permeability and relative permittivity of the medium filling the space between the central conductor and the inner wall of the probe, respectively; r is the inner diameter of the current monitoring probe; and d is the diameter of the central conductor. By adjusting the parameters of the filling medium material and the structural dimensions, impedance optimization can be achieved between this coaxial structure and the preceding matching network, ultimately ensuring the signal transmission stability and measurement accuracy of the entire monitoring system in a wide temperature range environment.

[0047] To optimize signal transmission performance, the impedance of the coaxial structure formed by the inner wall of the monitoring probe and the central conductor needs to be designed to be 50 ohms. This can be achieved by adjusting the magnetic permeability of the filling medium. With dielectric constant By combining the geometric relationship between the probe inner diameter r and the central conductor diameter d, the structural parameters that meet the impedance matching requirements can be accurately calculated, thereby completing the multi-level impedance coordination design of the fixture device.

[0048] During the performance verification phase, electromagnetic simulation software was used to perform overall full-wave modeling of the monitoring device. The overall 3D model is shown below. Figure 4As shown in the simulation model, the left and right N-type connectors are set as wave ports (first wave port and second wave port) as signal input and output interfaces. To simulate the actual test environment, the boundary conditions are set to zero tangential electric field in all directions, and a frequency domain solver is used for calculation. The VSWR characteristic curve of the fixture can be obtained through simulation and compared with the specifications of the standard fixture (requiring VSWR≤3.5 in the frequency band) to ensure that the transmission performance reaches the industry-leading level.

[0049] Furthermore, simulation verification was conducted on the current monitoring probe itself. Following the fixture installation specifications, the probe model and fixture model were assembled concentrically to ensure the central conductor axis coincided, achieving precise electromagnetic coupling. To investigate the effect of temperature on probe performance, the magnetic permeability data of the magnetic core under different temperature conditions were fitted using the Debye model, and the fitted permeability parameters were assigned to the magnetic core material in the simulation model. Subsequently, using the same frequency domain solver and boundary condition settings as the fixture simulation, the standing wave ratio (VSWR) characteristics of the probe at different temperatures were calculated, thereby comprehensively evaluating its operational stability in a wide temperature range environment.

[0050] Figure 5 The test results of the standing wave ratio (VSWR) of the current monitoring probe fixture in the 0.3-400MHz frequency band are presented. Figure 5 In the diagram, the horizontal axis represents frequency in MHz, and the vertical axis represents the standing wave ratio (VSWR). Given that the test frequency band for the magnetic core permeability data covers 0.3-400MHz, the calculation frequency band of the fixture design must strictly correspond to the frequency band of this permeability data. For example... Figure 5 As shown, within the test range of 0.3-400MHz, the VSWR of the fixture remained below 3.5, fully meeting the transmission performance requirements of the current monitoring probe (VSWR ≤ 3.5). This result verifies the electromagnetic compatibility of the fixture design and provides a reliable verification platform for subsequently mounting the current monitoring probe onto the fixture and conducting performance tests.

[0051] Figure 6 The insertion loss characteristics of the current monitoring probe and its fixture were presented in electromagnetic simulation software. Simulation results show that temperature changes significantly affect the insertion loss of the probe in the low-frequency range, but within the core operating frequency band of 2-400MHz, the insertion loss exhibits good flatness, with the maximum difference controlled within 2dB, fully meeting the performance requirements of the current monitoring probe. Further analysis revealed that the insertion loss in the low-frequency range increases with increasing temperature, but its value remains within the design standard over a wide temperature range of -40℃ to 40℃. It is worth emphasizing that although the insertion loss of the current monitoring probe designed in this paper is slightly higher than that of similar products, its ability to sense small current signals is superior, and it has stronger low-current detection sensitivity.

[0052] Figure 7This demonstrates the VSWR characteristics of the overall monitoring device model equipped with the current monitoring probe under different temperature conditions (-40℃ to 40℃). Simulation results show that within the design frequency band of 0.3-400MHz, regardless of temperature changes, the overall VSWR of the monitoring device remains consistently below 3.5, fully meeting the transmission performance requirements of industry standards. This result verifies the dual advantages of achieving high sensitivity and low VSWR in a wide temperature range environment, providing reliable technical support for precision current monitoring in complex temperature scenarios.

[0053] The invention will be further explained below with reference to the specific simulation optimization design process.

[0054] Optimized design of current monitoring probe:

[0055] This invention utilizes the dimensions of a special magnetic core material with excellent high and low temperature adaptability. The structural design is conducted using 3D simulation software. First, the housing structure of the current monitoring probe is planned based on the magnetic core dimensions. The housing is made of aluminum, with an outer diameter slightly larger than the outer diameter of the magnetic core and an inner diameter slightly smaller, ensuring no direct contact between the magnetic core and the probe housing. A coupling gap is created at the center of the inner side of the housing to optimize electromagnetic coupling performance. After completing the housing dimension design, the installation position of the input N-type connector is further determined. Given the clamp-type structure design of the probe, the N-type connector is not placed at the opening but rather on both sides of the opening to ensure ease of opening, closing, and installation of the probe. The key aspect of the structural design focuses on the fabrication of the magnetic core winding. The number of turns in the winding has a significant impact on the probe's insertion loss performance. However, since the electromagnetic characteristics of the coil winding are difficult to fully analyze theoretically, this study uses electromagnetic simulation software to simulate and verify the insertion loss of different winding forms, thereby optimizing the winding parameters. The final modeled current monitoring probe uses nanocrystals as the core material, with specific structural parameters: outer diameter 50mm, inner diameter 18.5mm, coupling gap width 1mm, and winding structure as follows. Figure 3 As shown, specifically, the magnetic core is wound three times from the tail pin of the N-type connector. This design achieves a balance between structural compactness and electromagnetic performance, providing a reliable foundation for precision current monitoring in a wide temperature range.

[0056] Optimized design of current monitoring probe clamp:

[0057] Based on the inner diameter parameters of the current monitoring probe and the impedance matching requirements of the coaxial structure formed by the center conductor of the fixture and the inner wall of the probe, the diameter d of the center conductor is first accurately calculated to ensure that the characteristic impedance of the coaxial structure is impedance-matched with the input N-type connector (50Ω). On this basis, for the coaxial interface formed by the center conductor and the N-type connector base, the key angle parameters (α and β) are further quantitatively analyzed. By adjusting the conductor cutting angle and the base mating angle, the optimized design of the center conductor's geometry is completed.

[0058] The design of the N-type connector base must strictly adhere to the mechanical dimension specifications of standard connectors to ensure assembly accuracy with the fixture body. Simultaneously, a dedicated fixing structure ensures a stable connection and guarantees reliable signal transmission. Ultimately, through multi-parameter collaborative optimization, impedance consistency was achieved between the coaxial structure of the fixture's center conductor and the probe's inner wall, as well as the N-type connector interface, providing a stable hardware foundation for high-precision testing of current monitoring probes.

[0059] Simulation optimization of the current monitoring probe:

[0060] For the current monitoring probe that has already been modeled, the simulation frequency band is set to 0.3-400MHz, the boundary condition is set to zero tangential electric field in all directions, and a frequency domain solver is used to perform simulation calculations. Ideally, the standing wave ratio (VSWR) of the fixture should be consistently below 3.5 in the 0.3-400MHz frequency band to meet the stringent transmission performance requirements of the current monitoring probe.

[0061] Simulation optimization of the current monitoring probe:

[0062] After completing the size optimization and VSWR performance verification of the current monitoring probe fixture, the current monitoring probe was installed according to... Figure 4 The probe is assembled into the fixture as shown, and the core permeability data obtained from actual testing is imported. For simulation settings, the N-type connector on the left side of the fixture is defined as the first wave port, the probe input as the second wave port, and the right side of the fixture as the third wave port. The simulation frequency band is set to 0.3-400MHz, and the boundary conditions are uniformly set to zero tangential electric field in all directions. A frequency domain solver is used to perform the calculations. The insertion loss between the first and second wave ports is the primary focus. If the insertion loss does not meet expectations, multi-dimensional optimization design can be carried out by adjusting key parameters such as the probe housing's outer diameter, inner diameter, coupling gap width, and winding structure, ultimately determining the optimal size scheme that meets the requirements of the GJB 151B standard.

[0063] In summary, this invention, based on a special magnetic core with wide temperature range adaptability, has developed a wide-temperature-range current monitoring probe and its matching fixture. Through deep synergistic optimization of material properties and structural design, it has for the first time overcome the bottleneck of stable operation in extreme environments ranging from -40℃ to +40℃. It maintains stable performance output in both frigid and scorching environments, solving the technical problem of limited application of traditional current probes under complex temperature conditions. Its insertion loss flat region covers the 2MHz-400MHz frequency band, with a stable value between -13dB and -11dB. Although this performance is slightly higher than that of standard current probes, this characteristic significantly enhances its ability to sense weak current signals, effectively expanding the dynamic range of monitorable current signals, making it particularly suitable for small-signal precision detection scenarios. Compared to similar products that are limited to room temperature environments, this invention, through the deep integration of materials science and electromagnetic design, achieves a dual improvement in environmental adaptability and detection sensitivity within a compact structural design.

[0064] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A simulation optimization design method for a monitoring probe and its fixture with high and low temperature characteristics, characterized in that, include: First, determine the dimensions of the current monitoring probe, and then design the current monitoring probe fixture based on the dimensions of the current monitoring probe through simulation. The current monitoring probe structure includes a special magnetic core with wide temperature range adaptability, a monitoring probe cavity, a magnetic core winding structure, and an adaptable N-type connector. The special magnetic core refers to a magnetic core material that maintains non-zero permeability under high temperature conditions, ensuring that the current monitoring probe has stable electromagnetic monitoring capabilities in a wide temperature range from -40℃ to +40℃. The housing design of the current monitoring probe follows the principle of minimization and adaptation, that is, while ensuring reliable embedding of the magnetic core, the housing size is greatly reduced through structural optimization, thereby improving the fit between the probe and the cable and its portability. For the magnetic core winding, electromagnetic simulation software was used to iteratively optimize the parameters of the number of turns and the arrangement of the magnetic core winding. The monitoring probe clamp consists of two side clamps, an openable upper cover, a lower fixed base, a central conductor, and N-type connectors on the left and right sides. The N-type connectors are connected to the clamp body through a retainer. During the clamp design, the impedance of the first coaxial structure formed by the central conductor and the N-type connector base is optimized. The impedance characteristics of the first coaxial structure can be quantitatively controlled using the following formula: ； In the formula, The relative permittivity of the filler material between the center conductor and the N-type connector base. The angle between the horizontal centerline of the central conductor and the cut-off portion of the conductor. Z represents the angle between the center line of the center conductor and the base of the N-type connector, and Z represents the impedance of the first coaxial structure. By adjusting the filling material to change the dielectric constant and changing the two included angles, the impedance of the coaxial structure can be controlled, ultimately achieving matching with the impedance set at the input end.

2. The simulation optimization design method for the monitoring probe and its fixture with high and low temperature characteristics according to claim 1, characterized in that, After the current monitoring probe is loaded into the fixture, a second coaxial structure is formed between the inner wall of the current monitoring probe and the central conductor. This second coaxial structure can be quantitatively analyzed using the following formula: ； In the formula, and These are the permeability and relative permittivity of the medium filling the space between the center conductor and the inner wall of the current monitoring probe, respectively; r is the inner diameter of the current monitoring probe; and d is the diameter of the center conductor. By adjusting the parameters of the filling medium material and the structural dimensions, impedance co-optimization between the second coaxial structure and the first coaxial structure is achieved.

3. The simulation optimization design method for the monitoring probe and its fixture with high and low temperature characteristics according to claim 2, characterized in that, When the impedance of the coaxial structure formed by the inner wall of the current monitoring probe and the central conductor is designed to be 50 ohms, the magnetic permeability of the filling medium can be adjusted. With dielectric constant By combining the geometric relationship between the probe inner diameter r and the central conductor diameter d, the structural parameters that meet the impedance matching requirements are calculated, thereby completing the multi-level impedance coordinated design of the monitoring device.

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