Corrosion monitoring device for underwater equipment
By installing a combination of eddy current probes and signal processing modules on underwater equipment, the problem of insufficient accuracy in corrosion monitoring of underwater equipment was solved, and automatic, online, and accurate corrosion monitoring was achieved.
Patent Information
- Application Number
- CN202520403750.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-03-07
AI Technical Summary
Existing methods for monitoring corrosion of underwater equipment suffer from insufficient monitoring accuracy, cumbersome operation, and low evaluation accuracy.
An eddy current probe is placed close to the monitoring area of the underwater equipment being tested. By generating eddy current signals and processing them using a signal processing module, the corrosion status can be automatically and online. An elastic element drives the eddy current probe to move along the axis of the annular protrusion to ensure detection accuracy.
It enables automatic, online monitoring of corrosion status of underwater equipment, is simple to operate, has high detection accuracy, significant corrosion feature identification, and high evaluation accuracy.
Smart Images
Figure CN223883520U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to corrosion monitoring technical field, and specifically, underwater equipment's corrosion monitoring device is related. BACKGROUND
[0002] At present, the corrosion monitoring of underwater equipment (especially steel structure in seawater for long-term service) mainly adopts the following two technical schemes: (1) visual identification method: the surface image of the equipment is shot through the underwater camera, and the corrosion area is identified based on image analysis, which depends on good lighting conditions and clean measured surface, but the light attenuation in underwater environment is serious, and the equipment surface is often covered with biological membrane, silt and other coverings, which makes it difficult to clearly identify the corrosion characteristics and obtain clear corrosion surface image, and the quantitative analysis of corrosion form (such as pitting corrosion and uniform corrosion) lacks uniform standard, the result is subjective, and only qualitative evaluation can be carried out; (2) hanging sample method: the standard sample is exposed in the corrosion environment synchronously with the measured equipment, and the sample is taken back regularly for laboratory analysis, and the corrosion rate is evaluated by weight loss method or electrochemical method, which needs periodic manual operation, and the operation is complicated, the detection period is long (usually in months), the current corrosion state of the equipment cannot be reflected in real time, and the evaluation accuracy is not high.
[0003] Therefore, the existing corrosion monitoring method of underwater equipment still has the problems of insufficient monitoring precision, complicated operation and low evaluation accuracy. UTILITY MODEL CONTENT
[0004] The main purpose of the utility model is to provide a corrosion monitoring device for underwater equipment, which aims to solve the technical problems of insufficient monitoring precision, complicated operation and low evaluation accuracy of the existing corrosion monitoring method of underwater equipment.
[0005] The utility model provides a corrosion monitoring device for underwater equipment, which comprises:
[0006] The shell is used for detachable connection with the measured underwater equipment, and the front end of the shell is provided with an annular protrusion;
[0007] The eddy current probe is axially arranged in the annular protrusion and is in sealing connection with the annular protrusion, is used for closely adhering to the monitoring area of the measured underwater equipment, and generates an eddy current signal on the monitoring area;
[0008] The elastic member is arranged at the bottom of the eddy current probe and is connected to the bottom of the annular protrusion, so that the eddy current probe can move along the axial direction of the annular protrusion;
[0009] The signal processing module is sealingly arranged in the interior of the shell and is electrically connected with the eddy current probe, is used for processing the eddy current signal generated by the eddy current probe, and outputs the processing result to the computer terminal.
[0010] In one embodiment, the eddy current probe comprises a pancake coil and a potting encapsulation, the pancake coil is electrically connected to the signal processing module by a wire, and the encapsulation is adapted to the size of the side inner wall of the annular protrusion.
[0011] In one embodiment, the elastic member comprises a spring, one end of the spring is connected to the bottom of the encapsulation, and the other end of the spring is connected to the bottom of the annular protrusion.
[0012] In one embodiment, the signal processing module comprises a sine wave generating circuit, a voltage sampling filter circuit, a current sampling filter circuit and a microcontroller, the sine wave generating circuit is connected in parallel to the pancake coil, the voltage sampling filter circuit is connected to the sine wave generating circuit, the current sampling filter circuit is connected in series to the pancake coil, and the microcontroller is electrically connected to the sine wave generating circuit, the voltage sampling filter circuit and the current sampling filter circuit respectively.
[0013] In one embodiment, the corrosion monitoring device further comprises a waterproof joint, the waterproof joint is arranged on the rear end of the shell opposite to the front end and is electrically connected to the interface of the microcontroller.
[0014] In one embodiment, the shell is provided with a mounting structure for fixing to the measured underwater equipment, when the shell is fixed to the measured underwater equipment through the mounting structure, the front end of the shell faces a monitoring area of the measured underwater equipment, and the eddy current probe is vertically aligned with the monitoring area.
[0015] In one embodiment, the distance between the detection surface of the eddy current probe and the surface of the monitoring area is not greater than 10 mm.
[0016] The corrosion monitoring device further comprises a waterproof gasket, the waterproof gasket is sleeved on the annular protrusion to seal the connection between the shell and the measured underwater equipment.
[0017] Compared with the prior art, the corrosion monitoring device has the following advantages:
[0018] The eddy current probe can be close to the monitoring area of the underwater equipment to be measured and generate an eddy current signal to the monitoring area by mounting the shell to the underwater equipment to be measured, the signal processing module can process the eddy current signal generated by the eddy current probe and output the processing result to the computer terminal, so that the corrosion condition of the underwater equipment to be measured is automatically and on-line monitored, and the whole process only needs to be installed once, and the operation is simple; meanwhile, under the driving of the elastic member, the eddy current probe can move along the axis direction of the annular protrusion to be close to the back of the monitoring area, so as to ensure the detection accuracy and facilitate the design of the small eddy current probe; in addition, compared with the existing visual recognition method, the utility model is based on the principle that the effective conductor thickness of the material is thinned by the eddy current signal, has a significant distinction degree, the corrosion feature is easier to identify, and the evaluation accuracy is high. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 is a structural schematic view of a corrosion monitoring device of an underwater equipment according to an embodiment of the utility model;
[0020] Figure 2 is a structural schematic view of a corrosion monitoring device fixed to the underwater equipment to be measured and the eddy current probe aligned with the monitoring area according to an embodiment of the utility model;
[0021] Figure 3 is a measurement principle schematic view of a corrosion monitoring device of an underwater equipment according to an embodiment of the utility model;
[0022] Figure 4 is a flow schematic view of a corrosion monitoring method of an underwater equipment according to an embodiment of the utility model.
[0023] Wherein:
[0024] 100, corrosion monitoring device; 10, shell; 11, annular protrusion; 20, eddy current probe; 21, pie-shaped coil; 30, signal processing module; 31, sine wave generating circuit; 32, voltage sampling filter circuit; 33, current sampling filter circuit; 34, microcontroller; 40, waterproof gasket; 50, mounting structure; 60, waterproof joint; 200, monitoring area.
[0025] The implementation, functional features and advantages of the utility model will be further described with reference to the drawings. DETAILED DESCRIPTION
[0026] It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.
[0027] In the description of the utility model, it is necessary to understand that the orientation or positional relation indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is the orientation or positional relation based on the orientation or positional relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.
[0028] In the description of the utility model, it should be explained that, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between two elements or the interaction relationship between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0029] In the utility model, unless otherwise specifically defined and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0030] Please refer to Figure 1 , Figure 1 It is a structure schematic view of a corrosion monitoring device 100 of underwater equipment provided by an embodiment of the utility model.
[0031] The corrosion monitoring device 100 of underwater equipment of the utility model embodiment, include: shell 10, eddy current probe 20, elastic piece (not shown in the drawing) and signal processing module 30.
[0032] The shell 10 is used for detachable connection with the underwater equipment to be measured, and the front end of the shell 10 is provided with a ring-shaped protrusion 11;
[0033] The vortex probe 20 is axially arranged in the ring-shaped protrusion 11 and is in sealing connection with the ring-shaped protrusion 11, and is used for closely monitoring the monitoring area 200 of the underwater equipment to be measured and generating a vortex signal on the monitoring area 200;
[0034] The elastic member is arranged at the bottom of the vortex probe 20 and is connected to the bottom of the ring-shaped protrusion 11, so that the vortex probe 20 can move along the axial direction of the ring-shaped protrusion 11;
[0035] The signal processing module 30 is sealingly arranged in the interior of the shell 10 and is in electrical connection with the vortex probe 20, and is used for processing the vortex signal generated by the vortex probe 20 and outputting the processing result to a computer terminal.
[0036] Please refer to Figure 2 In the embodiment, the corrosion monitoring device 100 is installed on the monitoring area 200 of the underwater equipment to be measured, and is used for monitoring the corrosion condition of the monitoring area 200.
[0037] Specifically, the shell 10 is a hollow cylinder, and the corrosion monitoring device 100 is in a whole cylinder shape. The ring-shaped protrusion 11 is arranged at the front end of the shell 10, and the vortex probe 20 is axially arranged in the ring-shaped protrusion 11 and is in sealing connection with the ring-shaped protrusion 11.
[0038] The vortex probe 20 is used for closely monitoring the monitoring area 200 of the underwater equipment to be measured and generating a vortex signal on the monitoring area 200. The embodiment of the utility model adopts the principle of vortex signal measurement. When a certain frequency alternating voltage U is applied to the vortex probe 20, the current I generated on the measured vortex system Z composed of the vortex probe 20, the monitoring area 200 and the metal material in the internal area is I. When U is unchanged and Z changes, I will also change, which is reflected in the change of the modulus value of I and the phase relative to U. There are many reasons for the change of Z. Under the current installation mode, the main change of Z is caused by the metal loss of the monitoring area 200, that is, the effective conductor thickness of the material of the underwater equipment to be measured is thinned, so the change of the corrosion condition of the monitoring area 200 will cause the change of the modulus value of I and the phase. Therefore, by measuring the alternating voltage U and the current I, the real-time vortex parameters of the measured vortex system Z can be calculated, so as to measure the thinning of the effective conductor thickness of the material, which has a significant distinction, the corrosion characteristics are easier to identify, the corrosion condition of the underwater equipment to be measured is evaluated, and the evaluation accuracy is high.
[0039] In one embodiment, the eddy current probe 20 comprises a pie-shaped coil 21 and a potting-encapsulated encapsulation shell, the pie-shaped coil 21 is electrically connected to the signal processing module 30 through a wire, and the size of the encapsulation shell is matched with the size of the inner wall of the side surface of the annular protrusion 11.
[0040] In this embodiment, the eddy current probe 20 comprises a pie-shaped coil 21 and a potting-encapsulated encapsulation shell, the pie-shaped coil 21 is wound by enameled wire, and is electrically connected to the signal processing module 30 through a wire, and the wire is plugged by potting through the hole of the annular protrusion 11.
[0041] Further, the pie-shaped coil 21 is encapsulated by potting to form an encapsulation shell, so as to achieve the purposes of waterproofing and insulation isolation, and the size of the encapsulation shell is matched with the size of the inner wall of the side surface of the annular protrusion 11, so as to facilitate the design of the small eddy current probe 20.
[0042] The elastic member is arranged at the bottom of the eddy current probe 20 and connected to the bottom of the annular protrusion 11, so that the eddy current probe 20 can move along the axial direction of the annular protrusion 11, and thus the eddy current probe 20 can slightly protrude from the annular protrusion 11 to tightly contact the back surface of the monitoring area 200, thereby ensuring the detection accuracy.
[0043] In one embodiment, the distance between the detection surface of the eddy current probe 20 and the surface of the monitoring area 200 is not greater than 10 mm, that is, when installing the corrosion monitoring device 100 of a kind of underwater equipment, the distance between the detection surface of the eddy current probe 20 and the surface of the monitoring area 200 should be not greater than 10 mm, so as to ensure the detection accuracy.
[0044] In one embodiment, the elastic member comprises a spring, one end of the spring is connected to the bottom of the encapsulation shell, and the opposite end of the spring is connected to the bottom of the annular protrusion 11.
[0045] In this embodiment, the spring has good elastic potential energy, so that the eddy current probe 20 can slightly protrude from the annular protrusion 11 and can move along the axial direction of the annular protrusion 11 with a small amplitude.
[0046] In other embodiments, the elastic member can also be other structures, such as a spring sheet, which is not limited here.
[0047] In one embodiment, the diameter of the eddy current probe 20 can be selected as 10 mm, and the diameter of the shell 10 is about 20 mm.
[0048] It can be understood that the diameter of the eddy current probe 20 and the diameter of the shell 10 can also be other values, which are not limited here.
[0049] Please refer to Figure 1In one embodiment, the shell 10 is provided with a mounting structure 50 for fixing to the underwater equipment to be measured, when the shell 10 is fixed to the underwater equipment to be measured by the mounting structure 50, the front end of the shell 10 faces the monitoring area 200 of the underwater equipment to be measured, and the eddy current probe 20 is vertically aligned with the monitoring area 200.
[0050] In this embodiment, the mounting structure 50 is used to fix the shell 10 as a whole to the underwater equipment to be measured, so as to monitor the corrosion condition of the monitoring area 200 in real time. Figure 2 In operation, the front end of the shell 10 faces the monitoring area 200 of the underwater equipment to be measured, and the eddy current probe 20 is vertically aligned with the monitoring area 200, which can ensure that the coupling state between the eddy current probe 20 and the monitoring area 200 is relatively stable, and the interaction between the eddy current probe 20 and the monitoring area 200 is more uniform and symmetrical in all directions, which is beneficial to improve the resolution and accuracy of measurement, and can more accurately measure the parameter changes of the monitoring area 200, such as thickness change, impedance change, etc., which is helpful for more detailed analysis and evaluation of the corrosion condition.
[0051] Optionally, the mounting structure 50 comprises threads arranged on the outer surface of the shell 10 or the annular protrusion 11.
[0052] Please refer to Figure 1 and Figure 2 In one embodiment, the corrosion monitoring device 100 further comprises a waterproof gasket 40, which is sleeved on the annular protrusion 11, so that the shell 10 is sealingly connected with the underwater equipment to be measured.
[0053] Generally, the installation method and requirement of the corrosion monitoring device 100 of the underwater equipment according to the embodiments of the present application are as follows:
[0054] (1) The corrosion monitoring device 100 is installed on the back of the monitoring area 200, which is used to monitor the corrosion condition of the monitoring area 200, and the back of the monitoring area 200 is reserved with sufficient space for the corrosion monitoring device 100 to be screwed in.
[0055] (2) The monitoring area 200 must be a plane or a curved surface with a large radius of curvature (such as greater than 1000mm), and the area within 2 times the diameter of the eddy current probe 20 on the monitoring area 200 should be flat, and there should be no too much structural change, so that the eddy current probe 20 can be vertically aligned with the monitoring area 200 as much as possible.
[0056] (3) When the installation structure 50 is a screw thread arranged on the outer surface of the shell 10 or the annular protrusion 11, a bolt hole should be drilled on the back of the monitoring area 200, which should be matched with the screw thread of the shell 10, and the position and depth should be ensured that the eddy current probe 20 can be tightly attached to the back of the monitoring area 200 after the corrosion monitoring device 100 is installed, and the distance from the surface of the monitoring area 200 should be no more than 10 mm.
[0057] (4) If it is difficult to find a qualified installation position due to reasons such as structure, a separate structure can be designed on the surface of the monitoring area 200 for installation, which should be consistent with the monitoring area 200 in terms of material, surface treatment (such as paint spraying), corrosion prevention device (such as sacrificial anode), etc. in addition to meeting the above conditions.
[0058] The functions of the signal processing module 30 include generating a series of frequency excitation signals, measuring the voltage and current of the measured eddy current system Z composed of the eddy current probe 20 and the monitoring area 200 at the corresponding frequency, obtaining the equivalent impedance modulus and phase of the measured eddy current system Z, and recording and outputting to the computer terminal (such as the host computer).
[0059] Please refer to Figure 3 In a specific embodiment, the signal processing module 30 includes a sine wave generating circuit 31, a voltage sampling filter circuit 32, a current sampling filter circuit 33, and a microcontroller 34, the sine wave generating circuit 31 is connected in parallel with the pancake coil 21, the voltage sampling filter circuit 32 is connected to the sine wave generating circuit 31, the current sampling filter circuit 33 is connected in series with the pancake coil 21, and the microcontroller 34 is electrically connected to the sine wave generating circuit 31, the voltage sampling filter circuit 32, and the current sampling filter circuit 33, respectively.
[0060] In this embodiment, the microcontroller 34 controls the sine wave generating circuit 31 to generate sine waves of different frequencies, uses the voltage sampling filter circuit 32 to measure the voltage U across the measured eddy current system Z, and uses the current sampling filter circuit 33 to measure the current I in the loop of the measured eddy current system Z. In the microcontroller 34, the FFT (Fast Fourier Transform) algorithm can be used to pick up the voltage and current amplitude, phase at the corresponding frequency, and calculate the impedance modulus and phase of the measured eddy current system Z, and output the processing results to the computer terminal.
[0061] Please refer to Figure 1 and Figure 3 In a specific embodiment, the corrosion monitoring device 100 further includes a waterproof connector 60 arranged on the rear end of the shell 10 opposite to the front end and electrically connected to the interface of the microcontroller 34.
[0062] In this embodiment, the microcontroller 34 is electrically connected to the computer terminal through the waterproof connector 60.
[0063] In other embodiments, the corrosion monitoring device 100 can also be electrically connected with the computer terminal in a wireless manner.
[0064] In summary, the corrosion monitoring device 100 of the underwater equipment provided in the embodiments of the present application can realize automatic and online monitoring of the corrosion condition of the measured underwater equipment by installing the shell 10 on the measured underwater equipment, enabling the eddy current probe 20 to closely adhere to the monitoring area 200 of the measured underwater equipment and generate an eddy current signal on the monitoring area 200, and enabling the signal processing module 30 to process the eddy current signal generated by the eddy current probe 20 and output the processing result to the computer terminal, and the whole process only needs to be installed once and is simple to operate; meanwhile, under the driving of the elastic member, the eddy current probe 20 can move along the axis direction of the annular protrusion 11 to closely adhere to the back of the monitoring area 200, so as to ensure the detection accuracy and facilitate the design of the small-sized eddy current probe 20; in addition, compared with the existing visual recognition method, the present application is based on the principle of measuring the effective conductor thickness reduction of the material based on the eddy current signal, has a significant distinction degree, and is easier to identify the corrosion characteristics and has high evaluation accuracy.
[0065] Please refer to Figure 4 , Figure 4 is a flowchart of a corrosion monitoring method of underwater equipment provided in an embodiment of the present application.
[0066] The corrosion monitoring method of underwater equipment in the embodiments of the present application is applied to the corrosion monitoring device 100 of underwater equipment described in any one of the above embodiments, and the corrosion monitoring method comprises the following steps:
[0067] S100, the signal processing module 30 applies an excitation signal of a preset frequency to the eddy current probe 20, so that the eddy current probe 20 generates an eddy current signal on the monitoring area 200 of the measured underwater equipment;
[0068] S200, the signal processing module 30 receives the eddy current signal generated by the eddy current probe 20, and obtains an eddy current parameter of a measured eddy current system composed of the eddy current probe 20 and the measured underwater equipment according to the eddy current signal;
[0069] S300, the signal processing module 30 outputs the eddy current parameter to the computer terminal;
[0070] S400, the computer terminal compares the eddy current parameter with a reference eddy current parameter of a non-corrosion standard sample to obtain a corrosion condition result.
[0071] In the embodiment, the signal processing module 30 applies an excitation signal of a preset frequency to the eddy current probe 20 to make the eddy current probe 20 generate an eddy current signal on the monitoring area 200 of the underwater equipment to be measured, the signal processing module 30 receives the eddy current signal generated by the eddy current probe 20, and obtains an eddy current parameter of a measured eddy current system composed of the eddy current probe 20 and the underwater equipment to be measured according to the eddy current signal. Specifically, the voltage and the current of the measured eddy current system Z composed of the eddy current probe 20 and the monitoring area 200 corresponding to the frequency are measured, the equivalent impedance modulus and the phase of the measured eddy current system Z are obtained and recorded, and output to the computer terminal. The computer terminal compares the eddy current parameter with the reference eddy current parameter of the uncorroded standard sample, calculates the change amount of the impedance modulus and the phase from the initial uncorroded measurement reference eddy current parameter, and evaluates the corrosion condition of the monitoring area 200.
[0072] In one specific embodiment, the step S200 of obtaining an eddy current parameter of a measured eddy current system composed of the eddy current probe 20 and the underwater equipment to be measured according to the eddy current signal comprises the following steps:
[0073] S210, obtaining the amplitude and phase of the voltage and the current in the eddy current signal at the preset frequency;
[0074] S220, calculating the impedance modulus of the measured eddy current system Z by the following formula (1):
[0075]
[0076] Wherein, |U| and |I| are the amplitudes of the voltage and the current at the preset frequency, respectively.
[0077] S230, calculating the phase of the measured eddy current system Z by the following formula (2):
[0078]
[0079] Wherein, And are the phases of the voltage and the current at the preset frequency, respectively, and the voltage and the current are synchronously sampled.
[0080] In one specific embodiment, the eddy current parameter comprises an eddy current curve, and the corrosion monitoring method further comprises:
[0081] S500, using the sweep frequency technology to measure the impedance modulus and the phase of the measured eddy current system corresponding to all preset frequencies in a preset frequency range, to obtain an eddy current curve of the measured eddy current system at different preset frequencies; wherein, the eddy current curve comprises an impedance modulus curve and a phase curve.
[0082] In the embodiment, the size of the eddy current system Z to be measured is related to the corrosion condition change of the monitoring area 200 and the frequency of the measured eddy current signal. In general, a suitable measurement frequency can be selected through experiments to obtain the maximum measurement sensitivity and dynamic range. However, in the embodiment, a sweep frequency technique can be used to adapt to various materials and a larger measurement range. Specifically, the Z values corresponding to all frequencies in the measurement frequency range of 10 Hz to 10 KHz are obtained to obtain the impedance modulus curve and the phase curve of the Z values. The difference between the current curve and the curve when there is no corrosion is analyzed by a computer terminal (such as the host computer software) to obtain the corrosion condition. In this way, the embodiment can record data in multiple frequency ranges to assist offline manual analysis, and the evaluation of the corrosion of the underwater equipment to be measured is more accurate.
[0083] In one specific embodiment, the corrosion monitoring method further comprises:
[0084] S600, using a simulated corrosion standard sample to assist in evaluating the corrosion condition.
[0085] Specifically, the corrosion monitoring device 100 is installed on standard samples of different preset thicknesses. For example, a series of standard samples with thicknesses decreasing from 10 mm to 1 mm (with an interval of 1 mm) are used, and the material, surface treatment, etc. of the standard samples are ensured to be consistent with the actual product to be measured, simulating the aging and thinning of the pipeline coating in actual underwater use.
[0086] The standard sample on which the corrosion monitoring device 100 is installed is placed in a device simulating a seawater environment, so that the monitoring object is in a seawater environment.
[0087] The corrosion monitoring device 100 is started, and the voltage and current data of the reference eddy current system composed of the eddy current probe 20 and the standard sample of different preset thicknesses are measured at different frequencies (such as 10 Hz to 10 KHz) according to the set measurement parameters, and the impedance modulus curve and the phase curve corresponding to different frequencies are recorded.
[0088] Using a data analysis tool or software, the frequency range with significant changes in the impedance modulus curve and the phase curve is found, a corresponding relationship between the change degree and the thickness is established, the change of the impedance modulus curve and the phase curve corresponding to the standard samples of different thicknesses is analyzed, and based on the measurement and analysis results of the standard samples, an evaluation standard for measuring the change of the product in actual use is established. The threshold values and judgment bases of each parameter in the evaluation standard are determined to accurately evaluate the monitoring data of the actual product. For example, in the case of simulating the aging and thinning of the pipeline coating in actual underwater use, when the coating thickness is found to be reduced to 5 mm, the phase angle at the frequency of 10 kHz is suddenly reduced from -60° to -85°, indicating that the corresponding coating reaches the failure threshold. Therefore, a mapping relationship of thickness-frequency-phase can be established for the degradation evaluation of the actual pipeline coating.
[0089] The subsequent computer terminal compares the eddy current parameter processed by the signal processing module 30 with the reference eddy current parameter (such as an initial curve) of the standard sample without corrosion, calculates a change amount, and if the change amount matches the impedance change of a certain simulated corrosion standard sample, the corrosion condition (such as the thickness reduction amount) of the measured underwater equipment can be inferred.
[0090] In summary, the underwater equipment corrosion monitoring method provided by the embodiments of the present application can realize automatic and online monitoring of the corrosion condition of the measured underwater equipment, and only needs to be installed once in the whole process, which is simple to operate; meanwhile, under the driving of the elastic member, the eddy current probe 20 can move along the axis direction of the annular protrusion 11 to tightly adhere to the back of the monitoring area 200, so as to ensure the detection accuracy and facilitate the design of the small-sized eddy current probe 20; in addition, compared with the existing visual recognition method, the present application is based on the principle of measuring the effective conductor thickness reduction of the material by the eddy current signal, has a significant distinguishing degree, and is easier to identify the corrosion characteristics and has high evaluation accuracy.
[0091] The above only describes the preferred embodiments of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process conversion, or direct or indirect application in other related technical fields based on the content of the present application specification and drawings, are also included in the patent protection range of the present application.
Claims
1. A corrosion monitoring apparatus for an underwater device, characterized by, The corrosion monitoring device comprises a shell for detachable connection with an underwater device to be measured, and a ring-shaped protrusion is arranged at the front end of the shell; a vortex probe is arranged axially in the ring-shaped protrusion and is in sealed connection with the ring-shaped protrusion, for closely monitoring a monitoring area of the underwater device to be measured and generating a vortex signal on the monitoring area; an elastic member is arranged at the bottom of the vortex probe and is connected to the bottom of the ring-shaped protrusion, so that the vortex probe can move along the axial direction of the ring-shaped protrusion; and a signal processing module is arranged in the interior of the shell in a sealed manner and is electrically connected with the vortex probe, for processing the vortex signal generated by the vortex probe and outputting the processing result to a computer terminal. The vortex probe comprises a pie-shaped coil and a glue-filled packaging shell, the pie-shaped coil is electrically connected with the signal processing module through a wire, and the size of the packaging shell is matched with the size of the inner wall of the side surface of the ring-shaped protrusion. The elastic member comprises a spring, one end of the spring is connected with the bottom of the packaging shell, and the other end of the spring is connected with the bottom of the ring-shaped protrusion. The signal processing module comprises a sine wave generating circuit, a voltage sampling and filtering circuit, a current sampling and filtering circuit and a microcontroller, the sine wave generating circuit is connected with the pie-shaped coil in parallel, the voltage sampling and filtering circuit is connected to the sine wave generating circuit, the current sampling and filtering circuit is connected with the pie-shaped coil in series, and the microcontroller is electrically connected with the sine wave generating circuit, the voltage sampling and filtering circuit and the current sampling and filtering circuit respectively. The corrosion monitoring device further comprises a waterproof joint, which is arranged at the rear end of the shell opposite to the front end and is electrically connected with the interface of the microcontroller.
2. A corrosion monitoring apparatus for an underwater device according to claim 1, wherein The shell is provided with a mounting structure for fixing with the underwater device to be measured, when the shell is fixed on the underwater device to be measured through the mounting structure, the front end of the shell faces the monitoring area of the underwater device to be measured, and the vortex probe is vertically aligned with the monitoring area.
3. A corrosion monitoring apparatus for an underwater device according to claim 2, wherein The distance between the detection surface of the vortex probe and the surface of the monitoring area is not greater than 10 mm.
4. The apparatus for monitoring corrosion of an underwater equipment according to claim 2, wherein The corrosion monitoring device further comprises a waterproof gasket, which is sleeved on the ring-shaped protrusion, so that the shell is in sealed connection with the underwater device to be measured.
5. A corrosion monitoring apparatus for an underwater device according to claim 4, wherein 6. The apparatus for monitoring corrosion of an underwater equipment according to claim 1, wherein 7. A corrosion monitoring apparatus for an underwater device according to claim 6, wherein