A porous alumina material infiltration process monitoring system

Abstract

The application provides a porous alumina material infiltration process monitoring system, which comprises a vacuum chamber and a placing mold placed in the vacuum chamber, the placing mold is used for placing a sample to be pressurized and infiltrated, further comprising: a pressure control device used for extracting air in the vacuum chamber and performing pressurization operation when epoxy resin infiltrates the porous alumina; a monitoring probe used for measuring the thickness change of the porous alumina in real time; a motion control device used for controlling the movement of the monitoring probe in the vacuum chamber; and a master control device used for transmitting a control signal to the motion control device, receiving measurement information returned by the monitoring probe and processing the measurement information, and obtaining a thickness change measurement value of the porous alumina. The monitoring system provided by the application can realize real-time monitoring and accurate measurement of the process of infiltrating the porous alumina with the epoxy resin while ensuring that the infiltration pressure of the porous alumina material is appropriate, and can improve the production efficiency and quality stability of the surface coating and infiltration process of the porous alumina.

Description

Technical Field

[0001] This invention relates to the field of power equipment material preparation technology, and in particular to a monitoring system for the wetting process of porous alumina materials. Background Technology

[0002] Epoxy resin-aluminum alloy interfaces are prevalent in key components of power equipment. However, due to the poor wetting properties of epoxy resin, the interface strength is insufficient under the influence of surface stress concentration and thermal expansion mismatch, seriously threatening the performance and lifespan of power equipment. Anodizing can prepare nanoporous structures on aluminum alloy surfaces. After epoxy resin wets the interface and enters the nanopores, the resulting anchoring and strengthening effect can significantly improve the bond strength, making it the most promising technology for reinforcing epoxy resin-aluminum alloy interfaces.

[0003] During the epoxy resin casting process on porous alumina surfaces, the degree of epoxy resin wetting significantly impacts the performance and application of the epoxy resin / aluminum alloy interface. To ensure adequate epoxy resin wetting, pressure is typically applied to ensure sufficient impregnation of the porous alumina film. Insufficient pressure leads to incomplete epoxy resin casting, resulting in air bubbles at the material interface and affecting mechanical and electrical properties. Excessive pressure, on the other hand, causes deformation and cracking of the porous alumina film due to compression, also affecting the insulator's service life. Therefore, real-time monitoring and accurate measurement of the epoxy resin impregnation process on porous alumina, and subsequent control of the impregnation pressure, are of paramount importance.

[0004] Real-time monitoring of the epoxy resin impregnation process of porous alumina can be achieved by measuring the change in the height of the epoxy resin layer covering the porous alumina surface. However, the height change during impregnation is very small, generally ranging from tens of nanometers to a few micrometers. Currently, devices used to measure the height change of the epoxy resin layer on porous alumina surfaces still have some shortcomings, such as inaccurate measurement and poor stability. Traditional measurement methods, such as microscopes and electron microscopes, cannot achieve real-time monitoring of the coating height change on porous alumina surfaces, and the measurement accuracy is affected by human factors and analytical methods. Summary of the Invention

[0005] The present invention aims to provide a monitoring system for the impregnation process of porous alumina materials to solve the above-mentioned technical problems. While ensuring appropriate impregnation pressure for porous alumina materials, it can accurately measure the thickness change of porous alumina, thereby realizing real-time monitoring and accurate measurement of the epoxy resin impregnation process of porous alumina, and improving the production efficiency and quality stability of porous alumina surface coating and impregnation processes.

[0006] To address the aforementioned technical problems, this invention provides a monitoring system for the impregnation process of porous alumina materials, comprising a vacuum chamber and a mold placed within the vacuum chamber, wherein the mold is used to place the sample to be pressurized and impregnated, and further comprising:

[0007] A pressure control device is used to extract air from the vacuum chamber and pressurize it during epoxy resin impregnation of porous alumina.

[0008] A monitoring probe, which is installed inside the vacuum chamber and above the mold, is used to measure the change in the thickness of porous alumina in real time.

[0009] A motion control device is used to control the movement of the monitoring probe within the vacuum chamber;

[0010] The main control unit is used to transmit control signals to the motion control device, receive measurement information returned by the monitoring probe, process the measurement information, and obtain the measurement value of the thickness change of porous alumina.

[0011] The monitoring system provided by the above solution can determine the pressure control value during the epoxy resin impregnation process of porous alumina using a pressure control device, ensuring the production efficiency and quality stability of the porous alumina surface coating and impregnation process. Simultaneously, the motion control device, in conjunction with the monitoring probe, can achieve precise measurement of the thickness variation of the porous alumina. This system possesses technical advantages such as accurate measurement, good stability, and a wide measurement range, and can adapt to the measurement needs of porous alumina samples of different sizes and shapes.

[0012] The above solution ensures appropriate wetting pressure for porous alumina materials while enabling precise measurement of the thickness variation of porous alumina. This allows for real-time monitoring and accurate measurement of the epoxy resin wetting process of porous alumina, improving the production efficiency and quality stability of the porous alumina surface coating and wetting process.

[0013] Furthermore, the pressure control device includes an air pump assembly and a pressure controller; the air pump assembly is used to extract air from the vacuum chamber and pressurize it during epoxy resin impregnation of porous alumina, and the pressurization operation is controlled by the pressure controller.

[0014] In the above scheme, the air pump assembly removes air from the vacuum chamber during epoxy resin impregnation of porous alumina, ensuring the vacuum state of the vacuum chamber. At the same time, the pressure controller controls the pressurization of the vacuum chamber, which can ensure the repeatability and stability of the preparation of porous alumina samples and the epoxy resin impregnation process, and ensure the repeatability and comparability of data acquisition.

[0015] Furthermore, the pressure control device also includes a pressure display and a pressure sensor; the pressure sensor is placed inside the vacuum chamber, and its output end is electrically connected to the signal input end of the pressure display, so that the pressure value it monitors can be displayed in real time.

[0016] In the above scheme, while the pressure controller controls the pressure value inside the vacuum chamber, a pressure sensor is simultaneously installed inside the vacuum chamber for signal feedback. This further ensures the stability of the pressure inside the vacuum chamber, avoids errors in system monitoring due to issues such as air leakage in the chamber, and improves the quality of the porous alumina surface coating and impregnation process. Simultaneously, a pressure display shows the pressure value monitored by the pressure sensor in real time, enabling real-time monitoring of the pressure during the impregnation process of the porous alumina material. This prevents problems such as insufficient epoxy resin pouring or deformation and cracking of the porous structure of the alumina film due to compression.

[0017] Furthermore, the motion control device includes a support guide rail fixed to the inner wall of the vacuum chamber, a support rod slidably connected at one end to the support guide rail, and a sliding assembly slidable on the support rod; wherein:

[0018] The support guide rail is used to receive control signals from the main control device and control the vertical movement of the support rod;

[0019] The sliding assembly is fixedly connected to the monitoring probe, and is used to receive control signals from the main control device and control the monitoring probe to move laterally on the support rod.

[0020] In the above scheme, the support rail enables the vertical movement of the monitoring probe within the vacuum chamber, allowing precise control of the distance between the probe and the sample to be pressurized and wetted. This facilitates the placement of the sample and enables high-precision measurement of its surface. The sliding assembly enables the lateral movement of the monitoring probe within the vacuum chamber. By controlling the sliding assembly to slide on the support rod, the specific position of the probe monitoring the sample to be pressurized and wetted can be precisely controlled, facilitating high-precision measurement of different positions on the sample and reducing actual measurement errors.

[0021] Furthermore, the vertical movement of the support rod controlled by the support guide rail and the lateral movement of the monitoring probe on the support rod controlled by the sliding kit are both achieved using a stepper motor.

[0022] Furthermore, the monitoring probe is an eddy current probe.

[0023] In the above scheme, the monitoring probe adopts an eddy current probe, which has the characteristics of high sensitivity and high precision, and can realize the accurate measurement of the thickness change of porous alumina.

[0024] Furthermore, the main control device includes a signal processing module, which is used to receive measurement information transmitted back by the monitoring probe and process the measurement information, converting the measurement information into inductance and resistance values ​​to obtain the measurement value of the thickness change of porous alumina.

[0025] In the above scheme, the signal processing module can convert the measurement information returned by the monitoring probe into inductance and resistance values ​​that can be measured intuitively, thereby improving the user-friendliness of the monitoring system and facilitating the monitoring personnel to call up and study the data, which greatly improves the monitoring effect and efficiency.

[0026] Furthermore, the main control device includes a data display module; the data display module is used to receive and display the inductance and resistance values ​​converted by the signal processing module.

[0027] In the above solution, the obtained inductance and resistance values ​​are displayed through the data display module, which further improves the user-friendliness of the monitoring system and displays the monitoring results intuitively, making it convenient for monitoring personnel to monitor the wetting process of porous alumina materials in real time.

[0028] Furthermore, the main control device includes a storage module; the storage module is used to receive and store the inductance and resistance values ​​converted by the signal processing module.

[0029] In the above solution, the storage module enables intelligent storage of monitoring data, making it convenient for monitoring personnel to access and study historical monitoring data.

[0030] Furthermore, the main control device includes a radio frequency cable; the radio frequency cable is used to transmit the measurement information returned by the monitoring probe to the signal processing module.

[0031] In the above scheme, the radio frequency cable can also be used to transmit the frequency signal, i.e. the control signal, emitted by the main control device to the motion control device. Attached Figure Description

[0032] Figure 1 This is a diagram illustrating the architecture of a monitoring system for the wetting process of porous alumina materials according to an embodiment of the present invention.

[0033] Figure 2 This is a circuit module connection diagram of a porous alumina material wetting process monitoring system provided in an embodiment of the present invention;

[0034] The components include: 1. Vacuum chamber; 2. Placement mold; 3. Sample to be pressurized and impregnated; 4. Pressure control device; 41. Air pump assembly; 42. Pressure controller; 43. Pressure display; 44. Pressure sensor; 5. Monitoring probe; 6. Motion control device; 61. Support rail; 62. Support rod; 63. Sliding kit; 7. Main control device; 71. Signal processing module; 72. Data display module; 73. Storage module; 74. Radio frequency cable. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figure 1 This embodiment provides a monitoring system for the wetting process of porous alumina materials, including a vacuum chamber 1 and a placement mold 2 placed in the vacuum chamber 1. The placement mold 2 is used to place the sample 3 to be pressurized and wetted. The system also includes:

[0037] Pressure control device 4 is used to extract air from the vacuum chamber 1 and pressurize the porous alumina when it is impregnated with epoxy resin.

[0038] The monitoring probe 5 is installed inside the vacuum chamber 1 and above the placement mold 2, and is used to measure the change in the thickness of the porous alumina in real time.

[0039] Motion control device 6 is used to control the movement of the monitoring probe 5 within the vacuum chamber 1;

[0040] The main control device 7 is used to transmit control signals to the motion control device 6, receive measurement information returned by the monitoring probe 5, process the measurement information, and obtain the measurement value of the thickness change of porous alumina.

[0041] The monitoring system provided in this embodiment can determine the pressure control value during the epoxy resin impregnation process of porous alumina by the pressure control device 4, ensuring the production efficiency and quality stability of the porous alumina surface coating and impregnation process. Simultaneously, the motion control device 6, in conjunction with the monitoring probe 5, can accurately measure the thickness change of the porous alumina. This system possesses technical advantages such as accurate measurement, good stability, and a wide measurement range, and can adapt to the measurement needs of porous alumina samples of different sizes and shapes.

[0042] This embodiment ensures appropriate wetting pressure for porous alumina materials while achieving precise measurement of the thickness variation of porous alumina. This enables real-time monitoring and accurate measurement of the epoxy resin wetting process of porous alumina, improving the production efficiency and quality stability of the porous alumina surface coating and wetting process.

[0043] It should be noted that the bottom layer of the sample 3 to be pressurized and impregnated can be a substrate of 6061 aluminum alloy or other metal materials used in power equipment. A porous aluminum oxide film is generated on the surface through anodizing process. The top layer is a poured epoxy resin. The type and parameters of the epoxy resin are determined by the application and occasion. The impregnation process is completed in the placement mold 2. The material of the placement mold 2 can be mold steel.

[0044] Further, please see Figure 1 , Figure 2 The pressure control device 4 includes an air pump assembly 41 and a pressure controller 42; the air pump assembly 41 is used to extract air from the vacuum chamber 1 and pressurize it when the porous alumina is impregnated with epoxy resin, and the pressurization operation is controlled by the pressure controller 42.

[0045] In this embodiment, the air pump assembly 41 removes air from the vacuum chamber 1 when the porous alumina is impregnated with epoxy resin, ensuring the vacuum state of the vacuum chamber 1. At the same time, the pressure controller 42 controls the pressurization of the vacuum chamber 1, which can ensure the repeatability and stability of the preparation of the porous alumina sample and the epoxy resin impregnation process, and ensure the repeatability and comparability of the data acquisition.

[0046] Furthermore, the pressure control device 4 also includes a pressure display 43 and a pressure sensor 44; the pressure sensor 44 is placed inside the vacuum chamber 1, and its output end is electrically connected to the signal input end of the pressure display 43, so that the pressure value it monitors can be displayed in real time by the pressure display 43.

[0047] In this embodiment, while the pressure controller 42 controls the pressure value inside the vacuum chamber 1, a pressure sensor 44 is simultaneously installed inside the vacuum chamber 1 for signal feedback. This further ensures the stability of the pressure inside the vacuum chamber 1, avoids errors in system monitoring due to issues such as air leakage in the chamber, and improves the quality of the porous alumina surface coating and impregnation process. Simultaneously, a pressure display 43 displays the pressure value monitored by the pressure sensor 44 in real time, enabling real-time monitoring of the pressure during the impregnation process of the porous alumina material. This avoids problems such as insufficient epoxy resin pouring or deformation and cracking of the porous structure of the alumina film due to compression.

[0048] Furthermore, the motion control device 6 includes a support rail 61 fixed to the inner wall of the vacuum chamber 1, a support rod 62 slidably connected at one end to the support rail 61, and a sliding assembly 63 slidable on the support rod 62; wherein:

[0049] The support rail 61 is used to receive the control signal from the main control device 7 and control the vertical movement of the support rod 62;

[0050] The sliding assembly 63 is fixedly connected to the monitoring probe 5, and is used to receive the control signal from the main control device 7 and control the monitoring probe 5 to move laterally on the support rod 62.

[0051] In this embodiment, the support rail 61 enables the vertical movement of the monitoring probe 5 within the vacuum chamber 1. It allows for precise control of the distance between the monitoring probe 5 and the sample 3 to be pressurized and impregnated, facilitating the placement of the sample 3 and enabling high-precision measurement of its surface. The sliding assembly 63 enables the lateral movement of the monitoring probe 5 within the vacuum chamber 1. By controlling the sliding assembly 63 to slide on the support rod 62, the specific position of the monitoring probe 5 monitoring the sample 3 to be pressurized and impregnated can be precisely controlled, facilitating high-precision measurement of different positions of the sample 3 and reducing actual measurement errors.

[0052] It should be noted that the support rail 61 and sliding assembly 63 are both used to support the monitoring probe 5 and enable its high-precision and certain range of movement, while maintaining its stability. They can be electrically powered and, in conjunction with the support rail 61, feature high rigidity, high precision, and low noise, making them suitable for various high-precision motion control applications. Therefore, the motion control device 6 can achieve real-time control and movement of the monitoring probe 5, and, in conjunction with the data acquisition and processing of the main control device 7, can achieve real-time monitoring and analysis of the data.

[0053] Furthermore, the vertical movement of the support rod 62 controlled by the support guide rail 61 and the lateral movement of the monitoring probe 5 on the support rod 62 controlled by the sliding kit 63 are both achieved by stepper motors.

[0054] In this embodiment, the main control device 7 can efficiently control the stepper motor through a single-axis stepper motor driver.

[0055] Furthermore, the monitoring probe 5 is an eddy current probe.

[0056] In this embodiment, the monitoring probe 5 is an eddy current probe, which has the characteristics of high sensitivity and high precision, and can realize accurate measurement of the thickness change of porous alumina.

[0057] It should be noted that this monitoring system can select different models of eddy current probes, bridge amplifiers and main control devices 7 according to actual needs, making it suitable for different environments and application scenarios.

[0058] Furthermore, the main control device 7 includes a signal processing module 71, which is used to receive measurement information transmitted back by the monitoring probe 5 and process the measurement information to convert the measurement information into inductance and resistance values ​​in order to obtain the measurement value of the thickness change of porous alumina.

[0059] In this embodiment, the signal processing module 71 can convert the measurement information returned by the monitoring probe 5 into inductance and resistance values ​​that can be measured intuitively, thereby improving the user-friendliness of the monitoring system interaction, facilitating the monitoring personnel to call up and study the data, and greatly improving the monitoring effect and efficiency.

[0060] It should be noted that the signal processing module 71 can be implemented using a bridge impedance circuit module. This module employs a high-precision bridge amplifier, featuring four bridge input channels, four voltage output channels, and one digital interface. It supports various bridge types and measurement ranges and can process the measurement information transmitted back from the monitoring probe 5 to obtain the inductance change rate caused by thickness variations. The aforementioned bridge amplifier features high precision and low temperature drift, ensuring the accuracy and stability of the measurement data.

[0061] Furthermore, the main control device 7 includes a data display module 72; the data display module 72 is used to receive and display the inductance and resistance values ​​converted by the signal processing module 71.

[0062] In this embodiment, the obtained inductance and resistance values ​​are displayed through the data display module 72, which further improves the user-friendliness of the monitoring system and displays the monitoring results intuitively, making it convenient for monitoring personnel to monitor the wetting process of porous alumina materials in real time.

[0063] Furthermore, the main control device 7 includes a storage module 73; the storage module 73 is used to receive and store the inductance and resistance values ​​converted by the signal processing module 71.

[0064] In this embodiment, the storage module 73 enables intelligent storage of monitoring data, facilitating the retrieval and study of historical monitoring data by monitoring personnel.

[0065] Furthermore, the main control device 7 includes a radio frequency cable 74; the radio frequency cable 74 is used to transmit the measurement information returned by the monitoring probe 5 to the signal processing module 71.

[0066] In this embodiment, the radio frequency cable 74 can also be used to transmit the frequency signal, i.e. the control signal, emitted by the main control device 7 to the motion control device 6.

[0067] It should be noted that the choice of RF cable 74 directly affects the signal transmission effect. The connection between monitoring probe 5 and RF cable 74 uses a connector, which has good stability and high-frequency characteristics. The specific connection between monitoring probe 5 and RF cable 74 can be optimized according to the actual application scenario and measurement requirements to obtain the best measurement effect.

[0068] Furthermore, the main control device 7 may also include a power supply, a signal generator, etc., which are used to control the measurement parameters and collect measurement data, process and analyze the data, and output the measurement results.

[0069] The monitoring system provided in this embodiment has advantages such as high precision, real-time monitoring, multifunctionality, repeatability, and environmental friendliness. It can be widely used in fields such as epoxy resin impregnation of porous alumina, and has significant application value and market prospects.

[0070] Furthermore, to illustrate the key technical points of the present invention and highlight its technical advantages, this embodiment specifically provides an application of a porous alumina material wetting process monitoring system. The initial system settings are as follows:

[0071] The maximum pumping speed of air pump assembly 41 is 28m. 3 The pressure gauge has a range of 0-1.6 bar and an accuracy class of 0.6. The pressure sensor 44 has a range of 0-1000 bar and an accuracy class of 0.05%. The support rail 61 has an effective stroke of 1400 mm and a load capacity of 3500 N. The support rod 62 has an effective stroke of 920 mm and a maximum speed of 2000 mm / min. The RF cable 74 has a frequency range of DC-18 GHz and an impedance of 50 Ω. The stepper motor has a step angle of 1.8 degrees, a rated current of 1.8 A, a voltage of 3.36 V, and a speed range of 0-400 rpm. The monitoring probe 5 has a frequency range of 0-4.2 GHz. The bridge impedance circuit has an input impedance of 10 GΩ, an input range of 0-5 mV / V, and an output range of ±10 V. The main control device 7 power supply has an output voltage of 0-60V, an output current of 0-100A, and a power range of 0-1500W; the signal generator has a frequency range of 1μHz-240MHz and an output voltage range of 0-20V.

[0072] The specific monitoring process of the system provided in this embodiment is as follows:

[0073] Prepare the sample 3 to be pressurized and impregnated, place it in the mold 2, and pour epoxy resin onto its surface. Place the casting mold with the sample in the vacuum chamber 1, select a suitable monitoring probe 5, and set the position and height of the eddy current probe. After turning on the air pump assembly 41 and pressure controller 42, the signal change sensed by the monitoring probe 5 is transmitted to the signal processing module 71 via the radio frequency cable 74. The signal processing module 71 converts the signal change into changes in inductance and resistance values ​​and transmits them to the data display module 72. It also controls the storage module 73 to store the data periodically. Finally, the processed data is displayed to the engineer.

[0074] The monitoring process provided in this embodiment ensures that the wetting pressure of the porous alumina material is appropriate while accurately measuring the thickness change of the porous alumina. This enables real-time monitoring and accurate measurement of the epoxy resin wetting process of porous alumina, improving the production efficiency and quality stability of the porous alumina surface coating and wetting process.

[0075] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A monitoring system for the wetting process of porous alumina materials, comprising a vacuum chamber (1) and a placement mold (2) placed in the vacuum chamber, wherein the placement mold (2) holds a sample (3) to be pressurized and wetted, characterized in that, Also includes: Pressure control device (4) is used to extract air from the vacuum chamber (1) and pressurize it when the porous alumina is impregnated with epoxy resin. The monitoring probe (5) is set inside the vacuum chamber (1) and above the placement mold (2) for real-time measurement of the thickness change of porous alumina; Motion control device (6) for controlling the movement of the monitoring probe (5) within the vacuum chamber (1); The main control device (7) is used to transmit control signals to the motion control device (6), receive measurement information returned by the monitoring probe (5) and process the measurement information to obtain the measurement value of the change in the thickness of porous alumina. Wherein: the pressure control device (4) includes an air pump assembly (41) and a pressure controller (42); the air pump assembly (41) is used to extract air from the vacuum chamber (1) and pressurize it when the porous alumina is impregnated with epoxy resin, and its pressurization operation is controlled by the pressure controller (42); The pressure control device (4) also includes a pressure display (43) and a pressure sensor (44); the pressure sensor (44) is placed inside the vacuum chamber (1), and its output end is electrically connected to the signal input end of the pressure display (43), so that the pressure value it monitors can be displayed in real time by the pressure display (43); The monitoring probe (5) is an eddy current probe.

2. The monitoring system for the wetting process of porous alumina materials according to claim 1, characterized in that, The motion control device (6) includes a support rail (61) fixed to the inner wall of the vacuum chamber (1), a support rod (62) slidably connected at one end to the support rail (61), and a sliding assembly (63) slidable on the support rod (62); wherein: The support rail (61) is used to receive the control signal from the main control device (7) and control the vertical movement of the support rod (62); The sliding assembly (63) is fixedly connected to the monitoring probe (5), and is used to receive the control signal from the main control device (7) and control the monitoring probe (5) to move laterally on the support rod (62).

3. The monitoring system for the wetting process of porous alumina materials according to claim 2, characterized in that, The vertical movement of the support rod (62) controlled by the support rail (61) and the horizontal movement of the monitoring probe (5) on the support rod (62) controlled by the sliding kit (63) are both achieved by stepper motors.

4. A monitoring system for the wetting process of porous alumina materials according to any one of claims 1 to 3, characterized in that, The main control device (7) includes a signal processing module (71), which is used to receive the measurement information returned by the monitoring probe (5) and process the measurement information to convert the measurement information into inductance and resistance values ​​in order to obtain the measurement value of the change in the thickness of porous alumina.

5. The monitoring system for the wetting process of porous alumina materials according to claim 4, characterized in that, The main control device (7) includes a data display module (72); the data display module (72) is used to receive and display the inductance and resistance values ​​converted by the signal processing module (71).

6. The monitoring system for the wetting process of porous alumina materials according to claim 4, characterized in that, The main control device (7) includes a storage module (73); the storage module (73) is used to receive and store the inductance and resistance values ​​converted by the signal processing module (71).

7. The monitoring system for the wetting process of porous alumina materials according to claim 4, characterized in that, The main control device (7) includes a radio frequency cable (74); the radio frequency cable (74) is used to transmit the measurement information returned by the monitoring probe (5) to the signal processing module (71).

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