Nuclear power plant coastal reinforced concrete structure monitoring device
By integrating multiple sensors and circuit systems into the coastal reinforced concrete structure of nuclear power plants, the problem of uncertainty in the corrosion of coastal reinforced concrete structures has been solved, enabling long-term real-time monitoring and accurate performance parameter feedback, thus ensuring the safety of nuclear power plants.
Patent Information
- Application Number
- CN202520016437.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-01-03
AI Technical Summary
The corrosion of coastal reinforced concrete structures of nuclear power plants is affected by factors such as seawater and chloride salts. The evaluation results of existing corrosion sensors have high uncertainty, which affects the safety of nuclear power plants.
Design a monitoring device for coastal reinforced concrete structures in nuclear power plants, comprising multiple sensors and circuit systems within the casing, to collect concrete performance parameters such as Cl concentration, temperature, humidity, pH, and steel reinforcement potential. The device is connected to a concrete monitoring system via wired communication and power supply to achieve long-term real-time monitoring.
It improves the accuracy and reliability of concrete structure monitoring, can provide real-time feedback of performance parameters, ensures the safety of nuclear power plants, and has a simple structure and is easy to install.
Smart Images
Figure CN223796413U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of marine engineering technology, and in particular to a monitoring device for coastal reinforced concrete structures of nuclear power plants. Background Technology
[0002] Nuclear power plants are typically built along the coast, and the concrete structures used in their construction are designed for a service life of several decades. However, due to factors such as carbonation, seawater, marine organism erosion, and chloride ions, coastal concrete structures face the risk of premature or unforeseen corrosion failure. Therefore, nuclear power plants require regular inspections of their concrete structures. While existing corrosion sensors can detect the corrosion rate of concrete structures and evaluate their performance, the actual corrosion situation is uncertain because coastal structures are also subject to seawater and chloride ions. Relying solely on corrosion rate assessments has limitations and low reliability, leading to biased evaluation results that are detrimental to nuclear power plant safety. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a monitoring device for coastal reinforced concrete structures of nuclear power plants.
[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct a monitoring device for coastal reinforced concrete structures of nuclear power plants, including a shell;
[0005] The first side of the shell is provided with a monitoring mechanism that can be embedded in the concrete to collect concrete performance parameters; wherein, the concrete performance parameters include CL concentration, temperature, humidity, pH, steel reinforcement potential and corrosion potential;
[0006] The housing includes a cavity, within which is provided a sensing signal processing circuit electrically connected to the monitoring mechanism, a control circuit electrically connected to the sensing signal processing circuit, and a power supply and communication circuit electrically connected to the monitoring mechanism, the sensing signal processing circuit, and the control circuit.
[0007] The second side of the housing is provided with a through hole, through which the power supply and communication circuit is electrically connected to the concrete monitoring system.
[0008] Preferably, the monitoring mechanism includes a CL concentration sensor, a pH sensor, and multiple potential sensors;
[0009] The sensing signal processing circuit includes an output switching unit electrically connected to the monitoring mechanism for receiving signals output by the CL concentration sensor, the pH sensor, and multiple potential sensors, and an output control unit electrically connected to the output switching unit and the control circuit for controlling the output switching unit to output the signal output by one of the CL concentration sensor, the pH sensor, and multiple potential sensors.
[0010] Preferably, the output control unit includes three control signal conversion units, each of which includes an optocoupler U22, a first resistor R27, and a second resistor R29; the anode of the optocoupler U22 is electrically connected to the control circuit via the first resistor R27, the cathode of the optocoupler U22 is electrically connected to digital ground, the collector of the optocoupler U22 is electrically connected to a first DC voltage via the second resistor R29, the emitter of the optocoupler U22 is electrically connected to analog ground, and the collector of the optocoupler U22 is also connected to the output switching unit.
[0011] Preferably, the output switching unit includes a multiplexer U32, the three channel control terminals of the multiplexer U32 are electrically connected to the collectors of the three optocouplers U22 respectively, the output terminal of the multiplexer U32 is electrically connected to the control circuit, and the multiple input terminals of the multiplexer U32 are electrically connected to the CL concentration sensor, pH sensor and various potential sensors included in the monitoring mechanism respectively.
[0012] Preferably, the monitoring mechanism further includes a corrosion sensor;
[0013] The sensing signal processing circuit also includes a corrosion signal processing unit electrically connected to the corrosion sensor and the control circuit.
[0014] Preferably, the corrosion signal processing unit includes an instrumentation amplifier U21, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a seventh resistor R7, a first capacitor C11, a second capacitor C12, a third capacitor C13, and a fourth capacitor C14.
[0015] The negative input terminal of the instrumentation amplifier U21 is connected to the negative terminal of the corrosion sensor via the third resistor R3 and to digital ground via the first capacitor C11. The positive input terminal of the instrumentation amplifier U21 is connected to the positive terminal of the corrosion sensor via the fourth resistor R4 and to digital ground via the third capacitor C13. The negative and positive input terminals of the instrumentation amplifier U21 are also connected in parallel with the second capacitor C12. The fifth resistor R5 is connected in parallel with the negative and positive terminals of the corrosion sensor. The output terminal of the instrumentation amplifier U21 is connected to digital ground via the seventh resistor R7 and the fourth capacitor C14. The connection point of the seventh resistor R7 and the fourth capacitor C14 is connected to the control circuit.
[0016] Preferably, the monitoring mechanism further includes a temperature and humidity sensor; the temperature and humidity sensor is electrically connected to the control circuit.
[0017] Preferably, the housing includes a cover and a shield; the cover includes an opening, a side wall adjacent to the opening, and a bottom wall opposite to the opening;
[0018] The monitoring mechanism is located on the side wall, the through hole is located on the bottom wall, and an aviation connector is provided on the through hole. The power supply and communication circuit is electrically connected to the concrete monitoring system through a cable passing through the aviation connector.
[0019] The cover is mechanically connected to the opening of the shroud to form the cavity with the shroud.
[0020] Preferably, the monitoring device for the coastal reinforced concrete structure of the nuclear power plant further includes a first receiving groove mechanically connected to the side wall for fixing the monitoring mechanism; the first receiving groove and the cover are an integral structure.
[0021] Preferably, the monitoring mechanism further includes a main body embedded in the first receiving slot, and the outer side of the main body is provided with a plurality of second receiving slots for accommodating the sensors included in the monitoring mechanism.
[0022] The present invention has the following beneficial effects: It can help the concrete monitoring system collect concrete performance parameters other than corrosion potential. It can also achieve electrical connection with the concrete monitoring system through wired communication and power supply, so that the present invention can monitor reinforced concrete structures in real time for a long time and feed back the concrete performance parameters to the concrete monitoring system in real time, thereby improving the monitoring effect of the concrete monitoring system. It also has the advantages of simple structure and convenient installation. Attached Figure Description
[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:
[0024] Figure 1 This is a schematic diagram of the structure of the monitoring device for coastal reinforced concrete structures of nuclear power plants in some embodiments of this utility model;
[0025] Figure 2 This is a circuit structure block diagram of the monitoring mechanism, sensor signal processing circuit, control circuit, and power supply and communication circuit in some embodiments of this utility model;
[0026] Figure 3 This is a schematic diagram of the shell structure in some embodiments of this utility model;
[0027] Figure 4 This is a schematic diagram of the structure of the monitoring device for the coastal reinforced concrete structure of a nuclear power plant in other embodiments of this utility model;
[0028] Figure 5 This is a circuit diagram of the output switching unit in some embodiments of this utility model;
[0029] Figure 6 This is a circuit diagram of the control signal conversion unit in some embodiments of this utility model;
[0030] Figure 7 This is a circuit diagram of the corrosion signal processing unit in some embodiments of this utility model;
[0031] Figure 8 This is a circuit diagram of the temperature and humidity sensor in some embodiments of this utility model. Detailed Implementation
[0032] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0033] In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "up," "down," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0034] Figure 1 This is a schematic diagram of the structure of a monitoring device for coastal reinforced concrete structures of nuclear power plants in some embodiments of the present invention. The monitoring device for coastal reinforced concrete structures of nuclear power plants includes a shell 1.
[0035] like Figure 1As shown, a monitoring mechanism 2 is provided on the first side of the shell 1, which can be embedded in the concrete to collect concrete performance parameters. These concrete performance parameters include CL concentration, temperature, humidity, pH, steel reinforcement potential, and corrosion potential.
[0036] In some embodiments, such as Figure 1 As shown, the monitoring device for the coastal reinforced concrete structure of the nuclear power plant also includes a first receiving groove 6, which is mechanically connected to the side wall 112 and is used to fix the monitoring mechanism 2.
[0037] In some embodiments, such as Figure 2 As shown, the monitoring device 2 may include a CL concentration sensor 21 for sensing the chloride ion concentration in concrete, an acidity / alkalinity sensor 22 for sensing the pH value of concrete, a corrosion sensor 24 for sensing the corrosion rate of concrete, a temperature and humidity sensor 25 for sensing the temperature and humidity of concrete, and multiple potential sensors 23 for sensing the potential of steel bars in multiple locations in the concrete.
[0038] To improve the sealing performance of the device, the first receiving groove 6 is preferably an integral structure with the cover 11.
[0039] In some embodiments, such as Figure 1 As shown, the monitoring mechanism 2 also includes a main body 261 embedded in the first receiving groove 6. The outer side of the main body 261 (i.e. the side opposite to the first receiving groove 6) is provided with a plurality of second receiving grooves 27 for accommodating each sensor included in the monitoring mechanism 2. Each sensor is embedded in the second receiving groove 27 so that each sensor can contact the concrete or steel bar.
[0040] Specifically, such as Figure 1 As shown, the plurality of second receiving slots 27 include two first sub-receiving slots 271 for accommodating the two probes included in the corrosion sensor 24, three second sub-receiving slots 272 for accommodating the CL concentration sensor 21, the pH sensor 22 and the temperature and humidity sensor 25, a third sub-receiving slot 273 for accommodating the corrosion sensor 24, and a plurality of fourth sub-receiving slots 274 for accommodating the potential sensor 23.
[0041] like Figure 3 As shown, the housing 1 includes a cavity 100, and the cavity 100 is provided with, for example, Figure 2 The sensor signal processing circuit 3, control circuit 4, and power supply and communication circuit 5 are shown. All three circuits are mounted on circuit board 345.
[0042] like Figure 2As shown, the sensing signal processing circuit 3 is electrically connected to the monitoring mechanism 2. The sensing signal processing circuit 3 is used to process the sensing signals output by each sensor included in the monitoring mechanism 2 and send the processed sensing signals to the control circuit 4.
[0043] like Figure 4 As shown, a through hole 200 is provided on the second side of the housing 1. The power supply and communication circuit 5 passes through the through hole 200 and is electrically connected to the concrete monitoring system to send concrete performance parameters to the concrete monitoring system.
[0044] In some embodiments, such as Figure 1 and Figure 4 As shown, the housing 1 includes a cover 11 and a cap 12. The cover 11 includes an opening, a side wall 112 adjacent to the opening, and a bottom wall 113 opposite to the opening. See also Figure 1 The monitoring mechanism 2 is located within the first receiving groove 6 on the side wall 112, and can be fixed to the first receiving groove 6 on the side wall 112 by screwing. Please refer to... Figure 4 A through hole 200 is provided on the bottom wall 113, and an aviation connector 300 is provided on the through hole 200. The power supply and communication circuit 5 is electrically connected to the concrete monitoring system through a cable passing through the aviation connector.
[0045] like Figure 3 As shown, the cover 12 and the cover 11 are detachably mechanically connected, facilitating the maintenance or replacement of the sensor signal processing circuit 3, control circuit 4, and power supply and communication circuit 5 by the staff. In addition, the connection between the cover 12 and the cover 11 forms a cavity 100 that can accommodate the sensor signal processing circuit 3, control circuit 4, and power supply and communication circuit 5.
[0046] In some embodiments, such as Figure 2 As shown, the sensor signal processing circuit 3 includes an output switching unit 31 and an output control unit 32.
[0047] The output switching unit 31 is electrically connected to the monitoring mechanism 2. The output switching unit 31 is used to receive the output signals of the CL concentration sensor 21, the acid-base sensor 22 and multiple potential sensors 23, and send the output signal of one of the CL concentration sensor 21, the acid-base sensor 22 and multiple potential sensors 23 to the control circuit 4 according to the control of the output control unit 32, so that the control circuit 4 can obtain the sensing signals output by multiple sensors using only one ADC port.
[0048] In some embodiments, such as Figure 5As shown, the output switching unit 31 may include a multiplexer U32. The three channel control terminals of the multiplexer U32 are electrically connected to the collectors of the three optocouplers U22 included in the output control unit 32, respectively. The output terminal of the multiplexer U32 is electrically connected to the control circuit 4. The multiple input terminals of the multiplexer U32 are electrically connected to the CL concentration sensor 21, the pH sensor 22 and the potential sensors 23 included in the monitoring mechanism 2, respectively.
[0049] In this embodiment, the multiplexer U32 can be a CD4051. The three channel control terminals of the multiplexer U32 correspond to the A0, A1, and A2 pins of the CD4051, respectively. The output terminal of the multiplexer U32 corresponds to the Z pin of the CD4051. The multiple input terminals of the multiplexer U32 correspond to the Y0, Y1, Y2, Y3, Y4, Y5, Y6, and Y7 pins of the CD4051, respectively. The output terminal of the multiplexer U32 corresponds to the Z pin. The output control unit 32 controls the output of any input sensing signal from the Y0 to Y7 pins to the control circuit 4 by controlling the high and low levels of the A0, A1, and A2 pins.
[0050] In some embodiments, the number of potential sensors 23 can be four, which are electrically connected to the Y0 pin, Y3 pin, Y4 pin and Y5 pin of CD4051 respectively.
[0051] like Figure 2 As shown, the output control unit 32 is electrically connected to the output switching unit 31 and the control circuit 4. The output control unit 32 is used to control the output switching unit 31 to output the signal of one of the sensors, namely the CL concentration sensor 21, the pH sensor 22 and the multiple potential sensors 23, according to the control command output by the control circuit 4.
[0052] In some embodiments, the output control unit 32 may include three control signal conversion units 321, such as... Figure 6 As shown, each control signal conversion unit 321 includes an optocoupler U22, a first resistor R27, and a second resistor R29. The anode of the optocoupler U22 is electrically connected to the control circuit 4 via the first resistor R27, the cathode of the optocoupler U22 is electrically connected to digital ground, the collector of the optocoupler U22 is electrically connected to a first DC voltage of 5V via the second resistor R29, the emitter of the optocoupler U22 is electrically connected to analog ground, and the collector of the optocoupler U22 is also connected to one of the channel control terminals of the multiplexer U32 included in the output switching unit 31.
[0053] In this embodiment, when the control circuit 4 outputs a high level to the first resistor R27, the LED in the optocoupler U22 emits light, thereby turning on the switch in the optocoupler U22. This sets the channel control terminal of the multiplexer U32, which is electrically connected to the collector of the optocoupler U22, to a low level. Conversely, when the control circuit 4 outputs a low level to the first resistor R27, the channel control terminal is pulled up by the second resistor R29 and set to a high level. In essence, the control circuit 4 can control the level of the channel control terminal by controlling the level output to the first resistor R27. It should be noted that the circuit structures of each control signal conversion unit 321 are the same. The difference lies in that the control circuit 4 uses three different I / O ports to control the level of the first resistor R27 input to each of the three control signal conversion units 321, thereby enabling the setting of the levels of the three channel control terminals of the multiplexer U32.
[0054] In some embodiments, such as Figure 2 As shown, the sensing signal processing circuit 3 may further include a corrosion signal processing unit 33, which is electrically connected to the corrosion sensor 24 and the control circuit 4. The corrosion signal processing unit 33 is used to amplify the corrosion sensing signal output by the corrosion sensor 24 and send the amplified corrosion sensing signal to the control circuit 4.
[0055] In some embodiments, such as Figure 7 As shown, the corrosion signal processing unit 33 includes an instrumentation amplifier U21, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first capacitor C11, a second capacitor C12, a third capacitor C13, and a fourth capacitor C14. One path of the negative input terminal of instrumentation amplifier U21 is connected to the negative terminal of corrosion sensor 24 (corresponding to network label URIN-) via the third resistor R3. The other path of the negative input terminal of instrumentation amplifier U21 is connected to digital ground via the first capacitor C11. One path of the positive input terminal of instrumentation amplifier U21 is connected to the positive terminal of corrosion sensor 24 (corresponding to network label URIN+) via the fourth resistor R4. The other path of the positive input terminal of instrumentation amplifier U21 is connected to digital ground via the third capacitor C13. The negative and positive input terminals of instrumentation amplifier U21 are also connected in parallel with the second capacitor C12. The fifth resistor R5 is connected in parallel with the negative and positive terminals of corrosion sensor 24. The two gain terminals of instrumentation amplifier U21 are connected in parallel with the sixth resistor R6. The reference voltage terminal of instrumentation amplifier U21 is connected to the set reference voltage. The output terminal of instrumentation amplifier U21 is connected to digital ground via the seventh resistor R7 and the fourth capacitor C14. The connection node of the seventh resistor R7 and the fourth capacitor C14 is connected to control circuit 4 (corresponding to network label UR1).
[0056] In this embodiment, the instrumentation amplifier U21 can be an XL620 instrumentation amplifier. The function of the instrumentation amplifier U21 is to amplify the voltage difference between the positive and negative terminals of the corrosion sensor 24 to obtain the amplified corrosion sensing signal. The first capacitor C11, the second capacitor C12, and the third capacitor C13 form a filter circuit, which can filter out noise in the corrosion sensing signal output by the corrosion sensor 24 and improve the signal-to-noise ratio.
[0057] In some embodiments, the temperature and humidity sensor 25 can be a temperature and humidity sensor of model SHT20. The temperature and humidity sensor 25 is electrically connected to the control circuit 4 via an IIC communication interface. Specifically, for example... Figure 8 As shown, the clock communication terminal and data communication terminal of the temperature and humidity sensor 25 are electrically connected to the control circuit 4. The data communication terminal of the temperature and humidity sensor 25 is also electrically connected to a second DC voltage of 3.3V via an eighth resistor R308, which acts as a pull-up resistor.
[0058] Please see Figure 2 The control circuit 4 is electrically connected to the sensor signal processing circuit 3. The control circuit 4 receives the processed sensing signal output by the sensor signal processing circuit 3 and sends the processed sensing signal to the concrete monitoring system through the power supply and communication circuit 5. The control circuit 4 can be composed of an existing microprocessor. The function of the microprocessor is to convert the processed sensing signal into a digital signal using existing technology and control the operation of the power supply and communication circuit 5 so that the converted digital sensing signal can be sent to the concrete monitoring system through the power supply and communication circuit 5.
[0059] Please see Figure 2 The power supply and communication circuit 5 is electrically connected to the monitoring mechanism 2, the sensor signal processing circuit 3 and the control circuit 4. The power supply and communication circuit 5 can also be electrically connected to the concrete monitoring system to draw power from the concrete monitoring system to supply power to the monitoring mechanism 2, the sensor signal processing circuit 3 and the control circuit 4, and send the sensing signal to the concrete monitoring system.
[0060] In some embodiments, the power supply and communication circuit 5 may include a power supply unit and a communication unit.
[0061] The power supply unit can be composed of existing switching power supply circuits or linear voltage regulator circuits. Its function is to convert the DC power supplied by the concrete monitoring system into DC voltages of various values to power the corresponding circuit modules. For example, it powers the control circuit 4 with a 3.3V DC voltage and the sensor signal processing circuit 3 with a 5V DC voltage. The input terminal of the power supply unit is electrically connected to the concrete monitoring system to obtain DC power (which can be 12V DC). The power supply unit includes multiple output terminals that output different DC voltages. These output terminals are electrically connected to the monitoring mechanism 2, the sensor signal processing circuit 3, and the control circuit 4, respectively, to power the corresponding circuits.
[0062] The communication unit can be an existing RS485 communication circuit. The communication unit is electrically connected between the control circuit 4 and the concrete monitoring system, and its function is to send the sensing signal to the concrete monitoring system.
[0063] It should be noted that the concrete monitoring system is an existing system used in nuclear power plants to monitor the reinforced concrete structures of coastal buildings. The main purpose of this invention is to assist the concrete monitoring system in collecting concrete performance parameters (including Cl concentration, temperature, humidity, pH, and rebar potential) in addition to corrosion potential. Cl concentration, temperature, humidity, pH, and rebar potential are all factors affecting ion exchange reactions in rebar. Therefore, collecting this information can help staff more accurately assess the health of the rebar, improving the monitoring effectiveness of the concrete monitoring system. This invention also achieves electrical connection with the concrete monitoring system via wired communication and power supply, enabling long-term real-time monitoring of reinforced concrete structures and real-time feedback of concrete performance parameters to the system, further improving its monitoring effectiveness. Furthermore, this invention has advantages such as simple structure and convenient installation.
[0064] Furthermore, existing potential sensors typically include a steel rebar electrode and a graphite electrode. The steel rebar electrode is electrically connected to the steel rebar, while the graphite electrode is grounded. The steel rebar potential refers to the voltage difference between the steel rebar electrode and the graphite electrode. Corrosion potential, on the other hand, refers to the voltage difference between the corrosion probe and the non-corrosion probe in existing corrosion sensors. Methods for calculating the corrosion rate based on the corrosion potential can be found in existing technologies and will not be elaborated upon here.
[0065] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.
Claims
1. A monitoring device for coastal reinforced concrete structures of nuclear power plants, characterized in that, Includes the housing (1); The first side of the shell (1) is provided with a monitoring mechanism (2) that can be embedded in the concrete for collecting concrete performance parameters; wherein, the concrete performance parameters include CL concentration, temperature, humidity, pH, steel reinforcement potential and corrosion potential; The housing (1) includes a cavity, in which a sensing signal processing circuit (3) electrically connected to the monitoring mechanism (2), a control circuit (4) electrically connected to the sensing signal processing circuit (3), and a power supply and communication circuit (5) electrically connected to the monitoring mechanism (2), the sensing signal processing circuit (3), and the control circuit (4) are provided. The second side of the housing (1) is provided with a through hole, and the power supply and communication circuit (5) passes through the through hole and is electrically connected to the concrete monitoring system.
2. The monitoring device for coastal reinforced concrete structures of nuclear power plants according to claim 1, characterized in that, The monitoring device (2) includes a CL concentration sensor (21), an acid-base sensor (22), and multiple potential sensors (23). The sensing signal processing circuit (3) includes an output switching unit (31) electrically connected to the monitoring mechanism (2) for receiving signals output by the CL concentration sensor (21), the pH sensor (22) and multiple potential sensors (23), and an output control unit (32) electrically connected to the output switching unit (31) and the control circuit (4) for controlling the output switching unit (31) to output the signal output by one of the CL concentration sensor (21), the pH sensor (22) and multiple potential sensors (23).
3. The monitoring device for coastal reinforced concrete structures of nuclear power plants according to claim 2, characterized in that, The output control unit (32) includes three control signal conversion units (321), each of which includes an optocoupler U22, a first resistor R27, and a second resistor R29. The anode of the optocoupler U22 is electrically connected to the control circuit (4) via the first resistor R27, the cathode of the optocoupler U22 is electrically connected to digital ground, the collector of the optocoupler U22 is electrically connected to a first DC voltage via the second resistor R29, the emitter of the optocoupler U22 is electrically connected to analog ground, and the collector of the optocoupler U22 is also connected to the output switching unit (31).
4. The monitoring device for coastal reinforced concrete structures of nuclear power plants according to claim 3, characterized in that, The output switching unit (31) includes a multiplexer U32. The three channel control terminals of the multiplexer U32 are electrically connected to the collectors of the three optocouplers U22 respectively. The output terminal of the multiplexer U32 is electrically connected to the control circuit (4). The multiple input terminals of the multiplexer U32 are electrically connected to the CL concentration sensor (21), pH sensor (22) and various potential sensors (23) included in the monitoring mechanism (2).
5. The monitoring device for coastal reinforced concrete structures of nuclear power plants according to claim 2, characterized in that, The monitoring device (2) also includes a corrosion sensor (24); The sensing signal processing circuit (3) further includes a corrosion signal processing unit (33) electrically connected to the corrosion sensor (24) and the control circuit (4).
6. The monitoring device for coastal reinforced concrete structures of nuclear power plants according to claim 5, characterized in that, The corrosion signal processing unit (33) includes an instrumentation amplifier U21, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a seventh resistor R7, a first capacitor C11, a second capacitor C12, a third capacitor C13, and a fourth capacitor C14. The negative input terminal of the instrumentation amplifier U21 is connected to the negative terminal of the corrosion sensor (24) via the third resistor R3 and to digital ground via the first capacitor C11. The positive input terminal of the instrumentation amplifier U21 is connected to the positive terminal of the corrosion sensor (24) via the fourth resistor R4 and to digital ground via the third capacitor C13. The negative and positive input terminals of the instrumentation amplifier U21 are also connected in parallel with the second capacitor C12. The fifth resistor R5 is connected in parallel with the negative and positive terminals of the corrosion sensor (24). The output terminal of the instrumentation amplifier U21 is connected to digital ground via the seventh resistor R7 and the fourth capacitor C14. The connection node of the seventh resistor R7 and the fourth capacitor C14 is connected to the control circuit (4).
7. The monitoring device for coastal reinforced concrete structures of nuclear power plants according to claim 2, characterized in that, The monitoring mechanism (2) also includes a temperature and humidity sensor (25); the temperature and humidity sensor (25) is electrically connected to the control circuit (4).
8. The monitoring device for coastal reinforced concrete structures of nuclear power plants according to any one of claims 2 to 7, characterized in that, The housing (1) includes a cover (11) and a cap (12); the cover (11) includes an opening, a side wall (112) adjacent to the opening, and a bottom wall (113) opposite to the opening. The monitoring mechanism (2) is located on the side wall (112), the through hole is located on the bottom wall (113), and the through hole is provided with an aviation connector. The power supply and communication circuit (5) is electrically connected to the concrete monitoring system through a cable passing through the aviation connector. The cover (12) is mechanically connected to the opening of the cover (11) to form the cavity with the cover (11).
9. The monitoring device for coastal reinforced concrete structures of nuclear power plants according to claim 8, characterized in that, It also includes a first receiving groove (6) that is mechanically connected to the side wall (112) for fixing the monitoring mechanism (2); the first receiving groove (6) and the cover (11) are an integral structure.
10. The monitoring device for coastal reinforced concrete structures of nuclear power plants according to claim 9, characterized in that, The monitoring mechanism (2) also includes a main body (261) embedded in the first receiving slot (6), and the outer side of the main body (261) is provided with a plurality of second receiving slots (27) for accommodating each sensor included in the monitoring mechanism (2).