Composite layer flexible sensing monitoring probe based on TMR sensing array

Abstract

The invention provides a composite layer flexible sensing monitoring probe based on a TMR sensing array, and relates to ocean engineering, the composite layer flexible sensing monitoring probe comprises a flexible array monitoring probe and a signal processing cabin, the flexible array monitoring probe comprises an excitation circuit layer and a sensor circuit layer and is packaged and protected through a flexible composite layer, the sensor circuit layer is provided with a TMR sensor, and the signal processing cabin is provided with a signal processing module. The signal processing cabin comprises a multiplexing circuit and a front-end amplification circuit. For an ocean platform jacket with a relatively long service period, jacket underwater cracks are frequently generated, and the jacket underwater cracks develop quickly under the action of environmental forces such as wind, waves and flow, so that the jacket structure and the structural safety of an ocean oil platform are greatly threatened. In order to solve the problem that underwater cracks of the jacket are difficult to repair, a composite layer flexible sensing monitoring probe based on a TMR sensing array is designed for underwater monitoring of an underwater crack monitoring system, and crack propagation information can be monitored for a long time on the irregular metal surface at the cracks of the jacket structure in the underwater environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ocean engineering, and particularly relates to a composite layer flexible sensing monitoring probe based on a TMR sensing array. BACKGROUND

[0002] For a long-service-period offshore platform jacket, underwater cracks of the jacket often occur, and the underwater cracks of the jacket develop rapidly under the action of environmental forces such as wind, wave and current, which greatly threatens the structural safety of the jacket and the offshore oil platform. It is difficult to repair the underwater cracks of the jacket, and for cracks that cannot be temporarily repaired, an underwater crack monitoring method can be used for monitoring. The underwater crack monitoring system can be based on the principle of electromagnetic induction and spatial magnetic field distortion caused by cracks, and the spatial magnetic field distortion signal is measured by using a sensor array, so that the monitoring and evaluation of the cracks are realized. However, the underwater situation of the jacket is complex, and marine organisms and coatings and other objects are often covered on the surface of the cracks, and the cracks often occur on the irregular metal surface at the nodes of the jacket, which poses a challenge to the monitoring of the cracks. SUMMARY

[0003] The main technical problem to be solved by the present application is that the underwater situation of the jacket is complex, and marine organisms and coatings and other objects are often covered on the surface of the cracks, and the cracks often occur on the irregular metal surface at the nodes of the jacket, which poses a challenge to the monitoring of the cracks. In order to overcome the above-mentioned defects existing in the prior art, a composite layer flexible sensing monitoring probe based on a TMR sensing array is provided.

[0004] The technical scheme adopted by the present application to solve the technical problem is: The composite layer flexible sensing monitoring probe based on the TMR sensing array comprises a flexible array monitoring probe and a signal processing cabin, wherein the flexible array monitoring probe comprises an excitation circuit layer and a sensor circuit layer, and is encapsulated and protected by a flexible composite layer, a TMR sensor is arranged on the sensor circuit layer, and the signal processing cabin comprises a multiplexing circuit and a front-end amplification circuit.

[0005] Further, the excitation circuit layer has a double-rectangular excitation coil.

[0006] Further, the circuit of the double-rectangular excitation coil is composed of left and right parts of the rectangular excitation coil, the wire diameter, size, inductance and impedance parameters of the left and right parts of the rectangular excitation coil are completely same, but the winding directions of the two parts are opposite, and the two parts are in a mirror image relationship along the symmetry axis.

[0007] Further, the TMR sensor adopts an array design, and the top layer and the bottom layer of the TMR sensor array circuit and the double-rectangular excitation coil circuit are provided with positioning lines, and the two can be precisely positioned and assembled through the silk screen layer positioning lines.

[0008] Further, the flexible composite layer is vulcanized to form a vulcanized protective layer by using cable-grade flame-retardant two-component insulating resin glue.

[0009] Further, the flexible array monitoring probe is provided with a positioning hole at the bottom end, and the exposed and unvulcanized part of the flexible array monitoring probe is connected and assembled in the signal processing cabin through the positioning hole at the bottom end of the flexible array monitoring probe and the pin and female header.

[0010] Further, the flexible array monitoring probe is provided with four mounting ears at the four corners.

[0011] Further, the flexible array monitoring probe, the front-end amplification circuit and the multiplexing circuit are covered with an outer shell.

[0012] Further, two through holes are designed on the bottom plate of the outer shell, and the bottom plate is in an arc structure.

[0013] Further, a positioning hole is designed on the circuit board of the multiplexing circuit, and a positioning column is designed at the position of the opening of the positioning hole of the flexible array monitoring probe.

[0014] The present application has the following advantages: The present application comprises a flexible array monitoring probe and a signal processing cabin, the flexible array monitoring probe comprises an excitation circuit layer and a TMR sensor, and is encapsulated and protected by a flexible composite layer. The signal processing cabin comprises a multiplexing circuit and a front-end amplification circuit. After being connected with an underwater monitoring system, the present application is attached to the underwater crack of a jacket, so that the flexible array monitoring probe covers the crack tip, and the operation is started after being fixed. The present application can be applied to the situation that the jacket node crack occurs within 20 meters under water, and the crack does not need to be repaired temporarily and needs to be monitored for a long time. The present application has a wide application range, and can monitor the crack expansion information of the irregular metal surface of the jacket structure crack under water. The present application has been tested in actual projects, and it is proved that the present application is convenient to install, easy to operate and safe and reliable. The high cost of immediately repairing the jacket crack is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0015] The present application will be further described below in combination with the drawings and embodiments.

[0016] Figure 1 It is a circuit diagram of the double-rectangular excitation coil of the present application; Figure 2 It is a TMR sensor array circuit diagram of the present application; Figure 3 It is a structure schematic diagram of the flexible array monitoring probe of the present application; Figure 4 It is a structure schematic diagram of the flexible array monitoring probe composite layer of the present application; Figure 5 This is a schematic diagram of the flexible array monitoring probe and signal processing cabin of the present invention; Figure 6 This is a schematic diagram of the overall structure of the present invention.

[0017] Explanation of the labels in the diagram: 1-Flexible array monitoring probe; 3-Sulfurized protective layer; 4-Sensor circuit layer; 5-Excitation circuit layer; 6-Magnetic shielding layer; 7-Multiplexing circuit; 8-Front-end amplifier circuit; 9-Housing; 10-TMR sensor. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions herein are used to explain the present invention, but are not intended to limit the present invention.

[0019] This invention designs a composite layer flexible sensing probe based on a TMR sensor array for underwater crack monitoring systems. It can monitor crack propagation information on irregular metal surfaces at crack locations in underwater environments and jacket structures for extended periods.

[0020] The composite layer flexible sensing and monitoring probe based on TMR sensor array of the present invention is an important part of the underwater crack monitoring hardware system. It is mainly responsible for exciting induced current on the surface of the test piece, acquiring changes in spatial magnetic field signals caused by cracks, and front-end processing of sensor signals, and works with the underwater crack monitoring system to complete the underwater structural crack monitoring operation.

[0021] Reference Figures 1-6 As shown, the composite layer flexible sensing and monitoring probe based on TMR sensing array disclosed in this invention is an important part of the underwater AC electromagnetic field monitoring hardware system, mainly consisting of two parts: flexible array monitoring probe 1 and signal processing cabin.

[0022] The operation method of this invention is as follows: after connecting the underwater monitoring system, it is attached to the underwater crack of the jacket, so that the flexible array monitoring probe 1 covers the tip of the crack, and the operation begins after it is fixed.

[0023] The flexible array monitoring probe 1 of the present invention includes an excitation circuit layer 5, on which a double rectangular excitation coil is provided. The circuit diagram of the designed double rectangular excitation coil is shown below. Figure 1 As shown. The circuit of this double rectangular excitation coil consists of two rectangular excitation coils, left and right. The wire diameter, size, inductance and impedance of the two rectangular excitation coils are exactly the same, but their winding directions are opposite and they are mirror images of each other along the axis of symmetry.

[0024] This invention employs a TMR sensor array design, using a TMR2503 sensor with a sensitive Z-direction as the monitoring probe. Specifically, the flexible array monitoring probe 1 includes a sensor circuit layer 4, on which TMR sensors 10 are arranged. Eight TMR sensors 10 are positioned along the weld direction, and four TMR sensors 10 are positioned perpendicular to the weld direction, with a sensor spacing of 5 mm. This enables large-scale monitoring of most crack areas along the weld direction and simultaneous monitoring of the weld and heat-affected zone. Figure 2 This is a circuit diagram of the TMR sensor array 10 used in this invention. The TMR sensor array has 32 channels and uses a +5V power supply. Each TMR sensor 10 outputs two differential signals. The TMR sensor 10 array circuit and the signal processing circuit are connected via pin headers and socket headers. The top and bottom silkscreen layers of both the TMR sensor 10 array circuit and the dual rectangular excitation coil circuit are designed with positioning lines, allowing for precise positioning and assembly.

[0025] To adapt to underwater environments, this invention incorporates a packaging design for the flexible array monitoring probe 1. The flexible array monitoring probe 1 is vulcanized using cable-grade flame-retardant two-component insulating resin adhesive to form a vulcanization protective layer 3. This vulcanization protective layer 3 is a flexible composite layer. Sensor positioning lines are drawn using a red waterproof paint pen, and the exposed, unvulcanized portion connects to the pin header and nut header through positioning holes at the bottom of the flexible array monitoring probe 1, allowing it to be assembled into the signal processing chamber. Four mounting ears are located at the four corners of the flexible array monitoring probe 1, allowing it to be fixed to the surface of test specimens such as pipes using stainless steel cable ties. A schematic diagram of the composite layer structure of the flexible array monitoring probe 1 is shown below. Figure 4 As shown, it includes, in sequence, a vulcanization protective layer 3, a sensing circuit layer 4, an excitation circuit layer 5, a magnetic shielding layer 6, and a vulcanization protective layer 3.

[0026] The signal processing chamber of this invention is used to power the flexible array monitoring probe 1 and perform signal processing. The signal processing chamber includes a multiplexing circuit 7 and a front-end amplifier circuit 8, such as... Figure 4 As shown. The outer shell 9 of the signal processing cabin is designed based on the dimensions of the flexible array monitoring probe 1, the front-end amplifier circuit 8, and the multiplexing circuit board. The outer shell 9 covers the outside of the flexible array monitoring probe 1, the front-end amplifier circuit 8, and the multiplexing circuit. Positioning posts are designed at the locations of the positioning holes on the flexible array monitoring probe 1 and the multiplexing circuit board to facilitate fixing the components and prevent relative movement. Two through holes are designed on the bottom plate of the outer shell 9 to facilitate the passage of cable ties through the signal processing cabin for fixation. The bottom plate is also curved to facilitate a tight fit to curved components. The final assembled underwater flexible monitoring probe is shown below. Figure 6 As shown.

[0027] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A composite layer flexible sensing and monitoring probe based on a TMR sensor array, comprising a flexible array monitoring probe and a signal processing cabin, characterized in that, The flexible array monitoring probe includes an excitation circuit layer and a sensor circuit layer, which are encapsulated and protected by a flexible composite layer. A TMR sensor is installed on the sensor circuit layer, and the signal processing cabin contains a multiplexing circuit and a front-end amplification circuit.

2. The composite layer flexible sensing and monitoring probe based on a TMR sensor array according to claim 1, characterized in that, The excitation circuit layer has two rectangular excitation coils.

3. The composite layer flexible sensing and monitoring probe based on a TMR sensor array according to claim 2, characterized in that, The circuit of the double rectangular excitation coil consists of two rectangular excitation coils, left and right. The wire diameter, size, inductance and impedance parameters of the two rectangular excitation coils are exactly the same, but their winding directions are opposite and they are mirror images of each other along the axis of symmetry.

4. The composite layer flexible sensing and monitoring probe based on a TMR sensor array according to claim 3, characterized in that, The TMR sensor adopts an array design. The top and bottom silkscreen layers of the TMR sensor array circuit and the dual rectangular excitation coil circuit are equipped with positioning lines, which can be used for precise positioning and assembly.

5. The composite layer flexible sensing and monitoring probe based on a TMR sensor array according to claim 4, characterized in that, The flexible composite layer is a vulcanization protective layer formed by vulcanization protection with cable-grade flame-retardant two-component insulating resin adhesive.

6. The composite layer flexible sensing and monitoring probe based on a TMR sensor array according to claim 5, characterized in that, The flexible array monitoring probe has a positioning hole at its bottom. The exposed uncured part of the flexible array monitoring probe is connected to the pin header and nut header through the positioning hole at the bottom of the flexible array monitoring probe and assembled in the signal processing cabin.

7. The composite layer flexible sensing and monitoring probe based on a TMR sensor array according to claim 1, characterized in that, The flexible array monitoring probe has four mounting ears at its four corners.

8. The composite layer flexible sensing and monitoring probe based on a TMR sensor array according to claim 1, characterized in that, The flexible array monitoring probe, front-end amplification circuit, and multiplexing circuit are covered by a housing.

9. The composite layer flexible sensing and monitoring probe based on a TMR sensor array according to claim 8, characterized in that, The bottom plate of the outer shell has two through holes, and the bottom plate has an arc-shaped structure.

10. The composite layer flexible sensing and monitoring probe based on a TMR sensor array according to claim 6, characterized in that, The circuit board of the multiplexing circuit has positioning holes, and the positions of these positioning holes and the positioning holes of the flexible array monitoring probe are designed with positioning posts.

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