A multifunctional composite sensor and control method for cable monitoring system

Abstract

The present invention discloses a multifunctional composite sensor and control method for a cable monitoring system, including a housing, a camera assembly, a temperature and humidity sensor assembly, a non-contact liquid level sensor, and a PCB board. The PCB board is used to enhance the image effect according to the acquired image through a multi-exposure image fusion enhancement algorithm, and is used to compare the threshold value according to the grayscale information entropy, temperature and humidity data, and liquid level data of the enhanced image, judge the validity of the data, and finally delete the invalid data, and encode and send the valid data after evaluation. The present invention integrates multi-modal data acquisition, fusion, and analysis into one by integrating multiple sensors and intelligent PCB boards, has good sealing performance, can actively trigger data acquisition, can improve image quality through algorithms, and evaluate the validity of multi-modal data through threshold comparison analysis, thereby improving the accuracy of monitoring data from the source and providing high-quality input for cable status evaluation.

Description

Technical Field

[0001] The invention relates to the technical field of bridge cable structure monitoring and protection, and in particular to a multifunctional composite sensor for a cable monitoring system and a control method. Background Art

[0002] In the existing bridge cable monitoring and protection technology, for example, patent CN202122804875.5 discloses a cable system monitoring device, which integrates multiple sensors and is connected and installed with the cable system to realize cable monitoring. However, the sensors used have the following shortcomings in actual work:

[0003] (1) The temperature and humidity sensor cannot be waterproof;

[0004] (2) The contacts of the liquid level sensor are easily exposed to water, which causes corrosion and shortens the service life.

[0005] (3) The finished camera module does not meet the sealing requirements, and the image data transmission distance is short, and the application scenarios are limited;

[0006] (4) At the same time, it can only passively collect temperature, humidity, water accumulation or image data, but cannot actively collect data. The data is highly volatile, making it difficult to analyze and evaluate its effectiveness.

[0007] The information disclosed in the above background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as admitting or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0008] In view of the above-mentioned existing defects, the purpose of the present invention is to provide a multifunctional composite sensor and control method for a cable monitoring system, which integrates multiple sensor modules and an integrated packaging structure of an outer shell with good sealing performance. It adds a mainboard control to actively collect and process data, and can effectively evaluate and transmit data over long distances, thereby ensuring the validity of the data and avoiding misjudgment of the internal state of the cable system due to uploading of erroneous data.

[0009] The technical solution of the present invention is as follows:

[0010] A multifunctional composite sensor for a cable monitoring system comprises a shell, and a camera assembly, a temperature and humidity sensor assembly, a non-contact liquid level sensor, and a PCB board arranged in the shell, wherein the temperature and humidity sensor assembly, the non-contact liquid level sensor, and the camera assembly are communicatively connected to the PCB board through a flexible cable, and the PCB board is integrated with a microprocessor; the temperature and humidity sensor assembly is used to obtain temperature and humidity data in the cable; the non-contact liquid level sensor is used to obtain liquid level data; the camera assembly is used to provide a light source and obtain an image of an anchor head inside the cable; the PCB board is used to enhance the image effect through a multi-exposure image fusion enhancement algorithm based on the acquired image, and is used to perform threshold comparison based on the grayscale information entropy, temperature and humidity data, and liquid level data of the enhanced image to judge the validity of the data, and finally delete the invalid data and encode and send the valid data after evaluation.

[0011] Specifically, the shell is a cylindrical structure, a card slot is provided in the middle of the shell, and the PCB board is plugged and fixed in the card slot; a positioning clip is provided on one side of the shell, and the non-contact liquid level sensor is fixedly installed between the positioning clip and the shell.

[0012] Specifically, the temperature and humidity sensor assembly includes a temperature and humidity sensor probe and a sealing cap; a first cylinder is arranged on the top of the shell, the temperature and humidity sensor probe is fixedly integrated in the part of the top of the PCB board entering the first cylinder, and the sealing cap is connected to the first cylinder through threads.

[0013] Specifically, the sealing cap is made of PE filter element material, and sealant is poured between the temperature and humidity sensor probe and the first cylinder.

[0014] Specifically, the camera assembly includes a camera module, a first camera bracket, a second camera bracket, and an LED fill light ring; a second cylinder is also provided on the top of the shell, the top of the second cylinder is set as an inclined surface, and a threaded hole is provided on the part of the top of the PCB board entering the second cylinder, the first camera bracket is clamped on the PCB board and fixed with the threaded hole by bolts; the second camera bracket is fixedly installed on the upper end of the first camera bracket, and the camera module is placed inside the second camera bracket; the LED fill light ring is fixed to the inclined surface of the second cylinder through the second camera bracket.

[0015] Specifically, the shell also includes a sealing ring, a sealing plug, a cable sealing joint, a hose internal thread joint, and a cap nut; the sealing plug is a structure with a middle through hole, with external threads at its upper and lower ends, an external step is arranged in the middle of the upper end, and an internal stop is arranged at the lower end; the cable sealing joint is a structure with a middle through hole, and the outer circular surface is arranged as a flange base structure; the upper end of the hose internal thread joint is arranged as an internal thread, and the lower end is arranged as an opening structure; a groove is arranged at the bottom of the shell, the sealing ring is arranged in the groove, the upper end of the sealing plug is threadedly connected to the bottom of the shell, and is sealed by pressing the sealing ring; the flange base of the cable sealing joint is sealingly connected to the internal stop at the lower end of the sealing plug; the internal thread at the upper end of the hose internal thread joint is connected to the external thread at the lower end of the sealing plug; the opening structure at the lower end of the hose internal thread joint is used to connect with the cable protection pipe for external communication through extrusion sealing; the cap end of the cap nut is sleeved with a sealing plug and supported on the bottom surface of the external step, and the nut end of the cap nut is used to tighten and fix the external thread base on the cable intelligent component.

[0016] The present invention also discloses a control method for a multifunctional composite sensor of a cable monitoring system, which adopts the multifunctional composite sensor as described above, and specifically includes: controlling the temperature and humidity, image and non-contact liquid level sensors to acquire the temperature and humidity data, image and liquid level data in the cable system according to the acquisition instructions; enhancing the image effect through a multi-exposure image fusion enhancement algorithm; evaluating and judging the validity of the image according to the grayscale information entropy of the enhanced image, and evaluating and judging the validity of the temperature and humidity data and the liquid level data according to a preset threshold; if valid, encoding and sending the data; if invalid, deleting the data.

[0017] Beneficial effects of the present invention:

[0018] 1. This solution integrates multiple sensors such as temperature, humidity, liquid level and image into one device, realizing multi-dimensional monitoring of the internal environment of the cable. By combining image, temperature, humidity and liquid level data for comprehensive judgment, data reliability is improved and false alarm rate is reduced;

[0019] 2. The device of this solution integrates a mainboard and a microprocessor, which can actively collect data, analyze and evaluate the data, and has the function of processing data, ensuring the validity of the data and avoiding misjudgment of the internal state of the cable system caused by erroneous data upload. After encoding, it can achieve stable long-distance transmission of data over one kilometer;

[0020] 3. The connection structure of the mainboard outlet of this solution is through the sealing plug, cable sealing joint and cap nut, so that the composite sensor of this solution can be simply assembled with the bridge cable and extended into the bottom of the cable system, while ensuring the enhanced sealing performance of the composite sensor;

[0021] 3. The composite sensor of this scheme adopts a waterproof and breathable PE filter element sealing cap to protect the temperature and humidity sensor probe, preventing water from entering the probe, and uses sealant to seal the connection between the probe and the composite sensor. The liquid level sensor adopts a non-contact capacitive liquid level sensor to realize contactless monitoring of the depth of accumulated water. The image sensor adopts an integrated packaging structure of camera module and shell, combined with the enhanced sealing design at the outlet of the mainboard to achieve the overall IP67 sealing performance of the composite sensor, improve the sealing protection performance of the sensor, avoid the risk of rust caused by direct contact between the sensor and accumulated water, and increase the service life of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the installation of a multifunctional composite sensor of a cable detection system of the present invention.

[0023] Figure 2 This is a front cross-sectional view of a multifunctional composite sensor for a cable detection system.

[0024] Figure 3 It is a side sectional view of a multifunctional composite sensor for a cable detection system.

[0025] Figure 4 The present invention is a flow chart of a control method of a multifunctional composite sensor of a cable detection system.

[0026] In the figure: 1-housing, 2-contactless liquid level sensor, 3-PCB board, 4-card slot, 5-positioning clip, 6-temperature and humidity sensor probe, 7-sealing cap, 8-first cylinder, 9-camera module, 10-first camera bracket, 11-second camera bracket, 12-LED fill light ring, 13-second cylinder, 14-threaded hole, 15-sealing ring, 16-sealing plug, 17-cable sealing connector, 18-capped nut, 19-cable wire protection tube, 20-cable intelligent component, 21-externally threaded base, 22-hose internal thread connector. DETAILED DESCRIPTION

[0027] In order to explain the technical content, purpose and effect of the present invention in detail, the following is an explanation in combination with embodiments and accompanying drawings. In the description of the embodiments, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0028] Example 1

[0029] like Figure 1-3As shown, a multifunctional composite sensor for a cable monitoring system according to a specific implementation of the present scheme mainly includes a housing 1, a PCB board 3 is integrated in the housing, and the PCB board 3 is an integrated circuit board with a microprocessor. A camera assembly, a temperature and humidity sensor assembly, and a non-contact liquid level sensor 2 are also installed and fixed in the housing 1. The temperature and humidity sensor assembly, the non-contact liquid level sensor 2, and the camera assembly are connected to the PCB board 3 through a flexible cable. The temperature and humidity sensor assembly is used to monitor the temperature and humidity of the environment in the cable in real time; the non-contact liquid level sensor 2 is used to detect the change of the liquid level in the cable; the camera assembly collects a high-resolution image of the anchor head inside the cable through a built-in light source. The PCB board 3 optimizes the image quality based on a multi-exposure image fusion enhancement algorithm, and performs a multi-dimensional threshold analysis based on the image grayscale information entropy, temperature and humidity, and liquid level data to determine the validity of the data and delete invalid data. The effective data evaluated is transmitted to the monitoring terminal after encoding to realize remote real-time monitoring and early warning functions.

[0030] The existing cable monitoring devices have a single function and can only passively collect temperature and humidity, water accumulation or image data, but cannot actively collect data. The data is highly volatile and difficult to analyze and evaluate its effectiveness. The composite sensor of this embodiment works as follows: This solution integrates multi-modal data acquisition, fusion and analysis by integrating a variety of sensors, temperature and humidity sensors, non-contact liquid level sensors, camera components and intelligent PCB boards. Different from the traditional passive acquisition method, this solution can actively trigger data acquisition, and use a multi-exposure image fusion algorithm to improve image quality, and evaluate the effectiveness of multi-modal data through threshold comparison analysis. With the help of quantitative methods such as grayscale information entropy to screen invalid or abnormal data, the accuracy of monitoring data can be improved from the source, providing high-quality input for cable status assessment.

[0031] After the system is started, the PCB board drives each sensor to collaboratively collect temperature, humidity, liquid level and image data. The camera uses the built-in light source to obtain multiple images with different exposures, and optimizes the image quality through the image fusion algorithm. All the collected data is gathered on the PCB board for real-time analysis. By setting reasonable threshold ranges such as temperature and humidity ranges, liquid level height limits and image grayscale entropy ranges, abnormal data is screened out and deleted. Finally, the processed valid data is encoded and transmitted to the monitoring terminal via wireless or wired methods to achieve remote real-time monitoring and data storage.

[0032] This solution effectively solves the problems of traditional cable monitoring devices with single functions, large data volatility and difficulty in analysis. Starting from the field of cable monitoring to the direction of intelligence, it upgrades from passive collection to active collection. It not only enhances the system's real-time perception of the cable status, but also uses grayscale information entropy and multimodal data threshold analysis to realize automatic judgment and screening of data validity, solving the problem of large data volatility of traditional devices. At the same time, the combination of high-quality image data and environmental information provides a more accurate basis for cable damage warning and maintenance decisions. Integrating multiple sensors and unified processing through PCB boards to achieve intelligent fusion of multimodal data, greatly improving the monitoring accuracy and environmental adaptability of the system.

[0033] As the preferred technical solution of this embodiment, Figure 2 As shown, the main body of the housing 1 is a hollow cylindrical structure, a card slot 4 is provided in the middle of the housing 1, and the PCB board 3 is fixed on the card slot 4 by plugging; a positioning clip 5 is provided on one side of the housing 1, and the non-contact liquid level sensor 2 is fixedly installed between the positioning clip 5 and the housing 1, as shown in FIG. Figure 1 As shown, during installation, the entire composite sensor body is located at the bottom of the cable, and the non-contact liquid level sensor is vertically arranged, and the liquid level can be measured across the plastic wall thickness.

[0034] like Figure 3 The temperature and humidity sensor assembly shown includes a temperature and humidity sensor probe 6 and a sealing cap 7; a first cylinder 8 is arranged on the top of the shell 1, and the part of the top of the PCB board 3 entering the first cylinder 8 is fixedly integrated with the temperature and humidity sensor probe 6, and the sealing cap 7 is connected to the first cylinder 8 through a thread, wherein the sealing cap 7 is made of a waterproof and breathable PE filter element material to prevent water from entering the probe, and a sealant is also injected between the temperature and humidity sensor probe 6 and the first cylinder 8 for sealing.

[0035] like Figure 3 The camera assembly shown includes a camera module 9, a first camera bracket 10, a second camera bracket 11, and an LED fill light ring 12; a second cylinder 13 is also provided at the top of the shell 1 adjacent to the first cylinder 8, and the top of the second cylinder 13 is set to a 7-degree inclined surface, and the part of the top of the PCB board 3 entering the second cylinder 13 is provided with two threaded holes 14, the first camera bracket 10 is clamped on the PCB board 3, and is fixed to the threaded holes 14 of the PCB board 3 by bolts; the second camera bracket 11 is fixedly installed on the upper end of the first camera bracket 10, and four threaded holes are drilled at the bottom, and is fixed to the first camera bracket 10 by screws, and its upper end is a multi-end cylinder; the camera module 9 is placed inside the second camera bracket 11; the LED fill light ring 12 is fixed through the second camera bracket 11 and the inclined surface of the second cylinder 13, and is used to provide a light source toward the top of the cable and obtain an image of the anchor head inside the cable, which is used to evaluate the rust state of the anchor head.

[0036] As a preferred technical solution of this embodiment, the housing 1 also includes a sealing ring 15, a sealing plug 16, a cable sealing joint 17, a hose internal thread joint 22, and a cap nut 18; the sealing plug 16 is a structure with a middle through hole, with external threads at both ends, an external step in the middle of the upper end, and an internal stop at the lower end, the cable sealing joint 17 is a middle through hole, and the outer cylindrical surface is set as a flange base structure, the upper end of the hose internal thread joint 22 is set as an internal thread, and the lower end is set as an opening structure, the bottom of the housing 1 is provided with a groove, the sealing ring 15 is set in the groove, and the upper end of the sealing plug 16 is provided. It is threadedly connected to the bottom of the shell 1 and sealed by a compression sealing ring 15; the flange base of the cable sealing joint 17 is sealed with the inner stopper at the lower end of the sealing plug 16; the inner thread at the upper end of the hose internal thread joint 22 is connected with the outer thread at the lower end of the sealing plug 16; the opening structure at the lower end of the hose internal thread joint 22 is used to be connected to the cable wire protection tube 19 for external communication through extrusion sealing; the cap end of the cap nut 18 is sleeved with the sealing plug 16 and supported on the bottom surface of the outer step, and the nut end of the cap nut 18 is used to be tightened and fixed with the outer thread base 21 on the cable intelligent component 20.

[0037] The installation steps of this embodiment are:

[0038] S1: Fix the temperature and humidity sensor assembly and the non-contact liquid level sensor in the internal card slot of the outer shell, fix the camera module to the camera bracket 2, and then connect it to the camera bracket 1, and connect the camera bracket 1 to the mainboard structure through screws, and electrically connect the camera assembly to the mainboard through a flexible cable;

[0039] S2: Place the mainboard with the camera assembly into the card slot and fix it, then electrically connect the temperature and humidity sensor assembly and the non-contact liquid level sensor to the mainboard;

[0040] S3: Connect the flange base of the cable sealing connector to the sealing plug for sealing. Pass the bus or optical fiber through the sealing plug and the cable sealing connector, and connect the connector at one end of the bus or optical fiber to the mainboard.

[0041] S4: Place a sealing ring in the groove on the bottom end face of the outer shell, then connect the sealing plug to the bottom of the outer shell with threads, tighten it to compact the sealing ring, and then tighten the cable sealing joint to compact and seal it with the bus or optical fiber;

[0042] S5: Install the device on the cable system and power it on for testing;

[0043] S6: Finally, the data is transmitted to an external monitoring system or platform to monitor the internal corrosion, temperature and humidity, water accumulation and images of the cable system.

[0044] Example 2

[0045] This embodiment adopts the multifunctional composite sensor of the cable detection system of embodiment 1, such as Figure 4 As shown, the control method flow is as follows:

[0046] According to the acquisition instructions, the temperature, humidity, image and non-contact liquid level sensors are controlled to acquire the temperature, humidity, image and liquid level data in the cable system;

[0047] The image is enhanced by using a multi-exposure image fusion enhancement algorithm;

[0048] The validity of the image is evaluated and judged according to the grayscale information entropy of the enhanced image, and the validity of the temperature, humidity data and liquid level data is evaluated and judged according to the preset threshold; if valid, the data is encoded and sent; if invalid, the data is deleted.

[0049] The composite sensor can sense the temperature, humidity and water accumulation status inside the cable anchorage area, provide real-time detection and early warning for bridge cable maintenance, and realize visual monitoring of anchor head corrosion through image data to ensure safe bridge operation.

[0050] Although the present invention has been described in detail above with specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A multifunctional composite sensor for a cable monitoring system, characterized in that: The invention comprises a housing (1), and a camera assembly, a temperature and humidity sensor assembly, a non-contact liquid level sensor (2), and a PCB board (3) arranged in the housing (1), wherein the temperature and humidity sensor assembly, the non-contact liquid level sensor (2), and the camera assembly are communicatively connected to the PCB board (3) via a flexible flat cable, and the PCB board (3) is integrated with a microprocessor; The temperature and humidity sensor assembly is used to obtain temperature and humidity data in the cable; The non-contact liquid level sensor (2) is used to obtain liquid level data; The camera assembly is used to provide a light source and obtain an image of the anchor head inside the cable; The PCB board (3) is used to enhance the image effect according to the acquired image through a multi-exposure image fusion enhancement algorithm, and is used to perform threshold comparison according to the grayscale information entropy, temperature and humidity data and liquid level data of the enhanced image to judge the validity of the data, and finally delete the invalid data and encode and send the valid data after evaluation.

2. The multifunctional composite sensor for cable monitoring system according to claim 1, characterized in that: The housing (1) is a cylindrical structure, a card slot (4) is provided in the middle of the housing (1), and the PCB board (3) is plugged and fixed in the card slot (4); a positioning clip (5) is provided on one side of the housing (1), and the non-contact liquid level sensor (2) is fixedly installed between the positioning clip (5) and the housing (1).

3. The multifunctional composite sensor for cable monitoring system according to claim 1, characterized in that: The temperature and humidity sensor assembly comprises a temperature and humidity sensor probe (6) and a sealing cap (7); a first cylinder (8) is arranged on the top of the housing (1); the temperature and humidity sensor probe (6) is fixedly integrated in the portion of the top of the PCB board (3) that enters the first cylinder (8); and the sealing cap (7) is connected to the first cylinder (8) via a thread.

4. The multifunctional composite sensor for cable monitoring system according to claim 3, characterized in that: The sealing cap (7) is made of a PE filter element material, and sealant is injected between the temperature and humidity sensor probe (6) and the first cylinder (8).

5. The multifunctional composite sensor for cable monitoring system according to claim 1, characterized in that: The camera assembly comprises a camera module (9), a first camera bracket (10), a second camera bracket (11), and an LED fill light ring (12); a second cylinder (13) is also arranged on the top of the shell (1), the top of the second cylinder (13) is arranged as an inclined surface, a threaded hole (14) is arranged on the part of the top of the PCB board (3) entering the second cylinder (13), the first camera bracket (10) is clamped on the PCB board (3) and fixed with the threaded hole (14) by bolts; the second camera bracket (11) is fixedly installed on the upper end of the first camera bracket (10), and the camera module (9) is placed inside the second camera bracket (11); the LED fill light ring (12) is fixed to the inclined surface of the second cylinder (13) by the second camera bracket (11).

6. The multifunctional composite sensor for cable monitoring system according to claim 1, characterized in that: The housing (1) further comprises a sealing ring (15), a sealing plug (16), a cable sealing joint (17), a hose internal thread joint (22), and a cap nut (18); The sealing plug (16) is a structure with a middle through hole, external threads at both ends, an external step at the middle of the upper end, and an internal stop at the lower end. The cable sealing joint (17) has a middle through hole and an outer circumferential surface which is configured as a flange base structure. The upper end of the hose internal thread connector (22) is provided with an internal thread, and the lower end is provided with an open structure. The bottom of the housing (1) is provided with a groove, the sealing ring (15) is arranged in the groove, the upper end of the sealing plug (16) is threadedly connected to the bottom of the housing (1), and is sealed by pressing the sealing ring (15); The flange base of the cable sealing joint (17) is sealingly connected to the inner stopper at the lower end of the sealing plug (16); The internal thread at the upper end of the hose internal thread connector (22) is connected to the external thread at the lower end of the sealing plug (16); The lower end opening structure of the hose internal threaded joint (22) is used to connect with an external communication cable protection tube (19) through extrusion sealing; The cap end of the cap nut (18) is sleeved with a sealing plug (16) and supported on the bottom surface of the outer step. The nut end of the cap nut (18) is used to be tightened and fixedly installed with the external thread base (21) on the cable intelligent component (20).

7. A control method for a cable monitoring system, using the multifunctional composite sensor according to any one of claims 1 to 5, characterized in that: include: According to the acquisition instructions, the temperature, humidity, image and non-contact liquid level sensors are controlled to acquire the temperature, humidity, image and liquid level data in the cable system; The image is enhanced by using a multi-exposure image fusion enhancement algorithm; The validity of the image is evaluated and judged according to the grayscale information entropy of the enhanced image, and the validity of the temperature, humidity data and liquid level data is evaluated and judged according to the preset threshold; if valid, the data is encoded and sent; if invalid, the data is deleted.

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