Watertightness detection device and method

Abstract

This invention provides a watertightness detection device and method, applicable to the field of detection technology. The watertightness detection device includes: a detection module comprising a sensing circuit board disposed corresponding to at least one non-sealed end of an underwater device, the shape of the sensing circuit board matching the shape of the non-sealed end, the sensing circuit board including a detection layer and a transmission layer, the sensing circuit board configured to output a first electrical signal via the transmission layer when water is detected by the detection layer; a conversion module including an optocoupler, the optocoupler including an optocoupler unit corresponding to each of the at least one sensing circuit board, the optocoupler unit configured to output a second electrical signal in response to the first electrical signal, wherein the second electrical signal indicates water leakage at the non-sealed end corresponding to the sensing circuit board; and a processing module configured to output alarm information based on the second electrical signal.

Description

Technical Field

[0001] At least one embodiment of the present invention relates to the field of detection technology, and more specifically to a water tightness detection device and method. Background Technology

[0002] The watertightness of underwater equipment relies on the meticulous design and precise installation of its structural components. However, even with a sealed outer shell, water leakage can still occur, potentially leading to malfunctions in internal electrical equipment. Therefore, to ensure the safe operation of underwater equipment, its watertightness must be tested.

[0003] In the process of realizing this invention, it was found that the water tightness detection method has low detection sensitivity and accuracy. Summary of the Invention

[0004] In view of the above problems, the present invention provides a watertightness detection device and method that improves the sensitivity and accuracy of watertightness detection, and can be applied to the watertightness detection of various underwater equipment.

[0005] According to a first aspect of the present invention, a watertightness detection device is provided, comprising: a detection module including a sensing circuit board disposed corresponding to at least one unsealed end of an underwater device, the shape of the sensing circuit board matching the shape of the unsealed end, the sensing circuit board including a detection layer and a transmission layer, the sensing circuit board being configured to output a first electrical signal via the transmission layer when water is detected by the detection layer; a conversion module including an optocoupler, the optocoupler including an optocoupler unit corresponding to at least one of the at least one sensing circuit board, the optocoupler unit being configured to output a second electrical signal in response to the first electrical signal, wherein the second electrical signal is used to indicate water leakage at the unsealed end corresponding to the sensing circuit board; and a processing module configured to output alarm information based on the second electrical signal.

[0006] According to an embodiment of the present invention, the detection layer is provided with a first detection electrode and a second detection electrode. The first detection electrode is connected to the transmission layer via a first lead-out hole, and the second detection electrode is connected to the transmission layer via a second lead-out hole. When the first detection electrode and the second detection electrode are connected by water, the sensing circuit board is configured such that the detection layer outputs a first electrical signal via the transmission layer.

[0007] According to an embodiment of the present invention, the shape of the unsealed end is ring-shaped, the first detection electrode is a first detection ring formed by wiring on a printed circuit board, the second detection electrode is a second detection ring formed by wiring on a printed circuit board, the wiring of the first detection ring extends to the first lead-out hole of the transmission layer through a notch region provided in the second detection ring, and the wiring of the second detection ring extends to the second lead-out hole of the transmission layer.

[0008] According to an embodiment of the present invention, the first detection ring and the second detection ring have the same ring width, and / or the first detection ring and the second detection ring are spaced apart by a first predetermined distance.

[0009] According to an embodiment of the present invention, the detection layer faces the unsealed end, the transmission layer faces the internal accommodating space of the underwater device, and a sealing strip is disposed between the transmission layer and the mounting surface of the sensing circuit board.

[0010] According to an embodiment of the present invention, the optocoupler unit includes: a light-emitting element, including a first electrode connected to the first detection electrode and a second electrode connected to a first power supply via a first resistor, configured to convert the first electrical signal into an optical signal and output the optical signal; and a receiving element, including an output terminal connected to the processing module, configured to convert the optical signal into a second electrical signal and output the second electrical signal.

[0011] According to an embodiment of the present invention, the receiving element includes: a third electrode connected to a second power supply; a fourth electrode connected to the ground terminal of the second power supply via a second resistor; and a photosensitive region configured to control the third electrode and the fourth electrode to conduct in response to the optical signal, and output the second electrical signal.

[0012] According to an embodiment of the present invention, the output terminal of the first detection electrode is kept disconnected from the first power supply ground terminal when there is no water seepage, and the output terminal of the second detection electrode is connected to the first detection electrode and the second detection electrode through water when there is water seepage, and forms a detection circuit with the first power supply ground terminal through the third resistor.

[0013] According to an embodiment of the present invention, the sensing circuit board is configured to output a third electrical signal via the transmission layer when the detection layer does not detect water; and the optocoupler unit is further configured to output a fourth electrical signal in response to the third electrical signal, wherein the fourth electrical signal is used to indicate that there is no water leakage at the non-sealed end corresponding to the sensing circuit board.

[0014] According to another aspect of the present invention, a water tightness detection method is provided, comprising: for any one of the sensing circuit boards of a detection module disposed corresponding to at least one unsealed end of an underwater device, the sensing circuit board outputs a first electrical signal via the transmission layer of the sensing circuit board when water is detected in the detection layer of the sensing circuit board; for any one of the optocoupler units of a conversion module comprising an optocoupler corresponding to at least one of the at least one of the sensing circuit boards, the optocoupler unit outputs a second electrical signal in response to the first electrical signal, wherein the second electrical signal is used to indicate water leakage at the unsealed end corresponding to the sensing circuit board; and a processing module outputting alarm information based on the second electrical signal.

[0015] According to embodiments of the present invention, the response speed is improved and thus the detection sensitivity is enhanced because the first electrical signal is directly triggered upon contact with the detection layer. Since the shape of the sensing circuit board matches the shape of the unsealed end, the detection layer of the sensing circuit board can cover potential seepage areas, improving detection comprehensiveness, reducing the probability of missed detections, and thus improving detection accuracy. Because the optocoupler unit can isolate the sensing circuit board and the processing module, the probability of false alarms caused by the underwater device's own electrical noise is reduced, thereby lowering the false alarm rate. Converting the first electrical signal into a second electrical signal through the optocoupler unit isolates the electrical noise of the sensing circuit board, improving the quality of the second electrical signal and thus enhancing detection accuracy. The unsealed end has a corresponding sensing circuit board and optocoupler unit, supporting multi-point synchronous detection, reducing crosstalk probability, improving the accuracy of seepage location positioning, and thus enhancing detection accuracy. Furthermore, since the second electrical signal can be a uniform level signal, it can be directly connected to an IoT platform, making it compatible with the alarm system of underwater devices. Attached Figure Description

[0016] The above-mentioned contents, as well as other objects, features and advantages of the present invention, will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings.

[0017] Figure 1 A schematic diagram of a water tightness testing device according to an embodiment of the present invention is shown.

[0018] Figure 2 A schematic diagram of a sensing circuit board according to an embodiment of the present invention is shown.

[0019] Figure 3 A schematic diagram of a conversion module according to an embodiment of the present invention is shown.

[0020] Figure 4 A schematic diagram of a conversion module according to an embodiment of the present invention is shown. Detailed Implementation

[0021] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the invention for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0022] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0023] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0024] When using expressions such as "at least one of A, B and C", they should generally be interpreted in accordance with the meaning that is commonly understood by those skilled in the art (e.g., "a system having at least one of A, B and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B and C, etc.).

[0025] For water tightness testing, methods can include resistive and capacitive methods. Resistive water tightness testing utilizes a resistor bridge and comparator. However, the circuit structure of resistive water tightness testing is relatively complex and susceptible to environmental factors and resistance deviations, leading to differences in the comparison voltage and reducing detection sensitivity and accuracy. Capacitive water tightness testing utilizes a capacitor-to-digital converter chip, but it requires precise electrode design and installation; even small errors affect detection accuracy. Furthermore, high-precision capacitor-to-digital converter chips are expensive, limiting their application. Therefore, water tightness testing methods generally have lower detection sensitivity and accuracy.

[0026] Therefore, embodiments of the present invention provide a water tightness testing device and method, which will be described below with reference to the accompanying drawings.

[0027] Figure 1 A schematic diagram of a water tightness testing device according to an embodiment of the present invention is shown.

[0028] like Figure 1 As shown, the water tightness testing device may include a testing module 1, a conversion module 2, and a processing module 3.

[0029] According to an embodiment of the present invention, the detection module 1 includes a sensing circuit board 10 disposed corresponding to at least one unsealed end 41 of the underwater device 4, the shape of the sensing circuit board 10 matching the shape of the unsealed end 41, the sensing circuit board 10 including a detection layer 11 and a transmission layer 12, the sensing circuit board 10 being configured to output a first electrical signal via the transmission layer 12 when water is detected by the detection layer 11. The conversion module 2 includes an optocoupler 20, the optocoupler 20 including an optocoupler unit 21 corresponding to at least one sensing circuit board 10, the optocoupler unit 21 being configured to output a second electrical signal in response to the first electrical signal, wherein the second electrical signal is used to indicate water leakage at the unsealed end 41 corresponding to the sensing circuit board 10; and a processing module 3, configured to output alarm information based on the second electrical signal.

[0030] In one embodiment, the shape of the underwater device 4 is designed according to its function and operating environment. The shape of the underwater device 4 can be streamlined, spherical, cylindrical, box-shaped, polyhedral, or a combination of shapes. The underwater device 4 can be a cylindrical body, and a cylindrical underwater device 4 can include two unsealed ends 41. In this case, the detection module 1 can include two sensing circuit boards 10, which are respectively disposed inside the two unsealed ends 41. The underwater device 4 can also be a spherical body, and a spherical underwater device 4 can include at least one unsealed end 41, for example, two, six, etc.

[0031] In one embodiment, the unsealed end 41 can be circular, and the sensing circuit board 10 can be designed to be circular or annular. The annular sensing circuit board 10 facilitates the placement of instruments and equipment inside the underwater device 41.

[0032] According to an embodiment of the present invention, the unsealed end 41 refers to the port of the underwater device 4 that still has the possibility of water leakage after sealing measures have been taken.

[0033] In one embodiment, the detection layer 11 may include two output ports, such as a first output port and a second output port. In the absence of water leakage, both output ports of the detection layer 11 are in an open-circuit state. In the event of water leakage, water forms a conductor between the two output ports of the detection layer 11, causing the two output ports of the detection layer 11 to change from an open-circuit state to a short circuit. For example, the first output port is grounded, and the second output port is connected to the conversion module 2 via the transmission layer 12. In the absence of water leakage, both output ports of the detection layer 11 are in an open-circuit state, and the second output port is suspended. In the event of water leakage, both output ports of the detection layer 11 are grounded, and the second output port outputs a first electrical signal (grounding signal) to the conversion module 2.

[0034] In one embodiment, in the event of water seepage, the optocoupler unit 21 responds to a first electrical signal (grounding signal) and outputs a second electrical signal based on the optocoupler effect.

[0035] In one embodiment, in the event of water leakage, the processing module 3 can output alarm information based on the second electrical signal, via a comparator or logic circuit. The alarm information can be audible, visual, or a voltage signal, used to perform subsequent protective operations such as power-off of instrument components.

[0036] According to embodiments of the present invention, the response speed is improved and thus the detection sensitivity is enhanced because the first electrical signal is directly triggered upon contact with the detection layer. Since the shape of the sensing circuit board matches the shape of the unsealed end, the detection layer of the sensing circuit board can cover potential seepage areas, improving detection comprehensiveness, reducing the probability of missed detections, and thus improving detection accuracy. Because the optocoupler unit can isolate the sensing circuit board and the processing module, the probability of false alarms caused by the underwater device's own electrical noise is reduced, thereby lowering the false alarm rate. Converting the first electrical signal into a second electrical signal through the optocoupler unit isolates the electrical noise of the sensing circuit board, improving the quality of the second electrical signal and thus enhancing detection accuracy. The unsealed end has a corresponding sensing circuit board and optocoupler unit, supporting multi-point synchronous detection, reducing crosstalk probability, improving the accuracy of seepage location positioning, and thus enhancing detection accuracy. Furthermore, since the second electrical signal can be a uniform level signal, it can be directly connected to an IoT platform, making it compatible with the alarm system of underwater devices.

[0037] Figure 2 A schematic diagram of a sensing circuit board according to an embodiment of the present invention is shown.

[0038] like Figure 2As shown, according to an embodiment of the present invention, the detection layer 11 is provided with a first detection electrode 111 and a second detection electrode 112. The first detection electrode 111 is connected to the transmission layer 12 via a first lead-out hole 113, and the second detection electrode 112 is connected to the transmission layer 12 via a second lead-out hole 114. When the first detection electrode 111 and the second detection electrode 112 are connected by water, the sensing circuit board 10 is configured such that the detection layer 11 outputs a first electrical signal via the transmission layer 12.

[0039] like Figure 1 and Figure 2 As shown, in one embodiment, a sealing strip is provided between the detection layer 11 and the transmission layer 12 of the sensing circuit board 10. In the event of water leakage at the non-sealed end 41, the water will first flow through the detection layer 11. The first lead-out hole 113 and the second lead-out hole 114 of the sensing circuit board 10 can be via designs of the PCB (Printed Circuit Board) or solder joints of the transmission layer 12, so as to input the first electrical signal to the conversion module 2 via the signal transmission line.

[0040] According to an embodiment of the present invention, a first lead-out hole and a second lead-out hole are provided on the transmission layer, which can effectively transmit the first electrical signal. The isolation between the detection layer and the transmission layer can clearly define the functional areas.

[0041] like Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, the non-sealed end 41 is ring-shaped. The first detection electrode 111 is a first detection ring formed by wiring on a printed circuit board, and the second detection electrode 112 is a second detection ring formed by wiring on a printed circuit board. The wiring of the first detection ring extends to the first lead-out hole 113 of the transmission layer 12 through the notch area provided in the second detection ring, and the wiring of the second detection ring extends to the second lead-out hole 114 of the transmission layer 12.

[0042] In one embodiment, the circuit board of the sensing circuit board 10 can adopt a two-layer PCB printed circuit board process, with copper-plated wiring and tin-plated surfaces on both layers of the circuit board to ensure good conductivity.

[0043] According to an embodiment of the present invention, the first detection ring and the second detection ring have the same ring width, and / or the first detection ring and the second detection ring are spaced apart by a first predetermined distance.

[0044] According to an embodiment of the present invention, the detection layer 11 faces the unsealed end 41, the transmission layer 12 faces the internal accommodating space of the underwater device 4, and a sealing strip is disposed between the transmission layer 12 and the mounting surface of the sensing circuit board 10.

[0045] Figure 3 A schematic diagram of a conversion module according to an embodiment of the present invention is shown.

[0046] like Figure 3 As shown, the optocoupler 20 includes at least one optocoupler unit. The optocoupler unit 21 includes a light-emitting element and a receiving element.

[0047] According to an embodiment of the present invention, the light-emitting element includes a first electrode connected to a first detection electrode and a second electrode connected to a first power supply P1 via a first resistor R1. The light-emitting element is configured to convert a first electrical signal into an optical signal and output an optical signal. The receiving element includes an output terminal connected to a processing module and is configured to convert the optical signal into a second electrical signal and output a second electrical signal.

[0048] like Figure 3 As shown, according to an embodiment of the present invention, the receiving element includes a third electrode connected to the second power supply P2; a fourth electrode connected to the second power supply ground terminal P2-GND via a second resistor R2; and a photosensitive region configured to control the third and fourth electrodes to conduct in response to an optical signal, and output a second electrical signal.

[0049] According to an embodiment of the present invention, the processing module, based on at least one second electrical signal, can instruct the instrument control center inside the underwater equipment to implement corresponding protective measures through a preset alarm program.

[0050] In one embodiment, the processing module may include a processor, such as an ARM (Advanced RISC Machine), an FPGA (Field Programmable Gate Array), etc.

[0051] Combination Figures 1-3 In the absence of water leakage, the first detection electrode 111 and the second detection electrode 112 are disconnected, the detection layer 11 has no signal output, the optocoupler 20 is not conductive, and the conversion module 2 outputs a low-level signal. The processing module 3 receives the low-level signal and does not output any alarm information. In the presence of water leakage, the first detection electrode 111 and the second detection electrode 112 are conductive, the detection layer 11 outputs a first electrical signal (ground signal), and the optocoupler 20 responds to the first electrical signal (ground signal) by outputting a high-level signal, i.e., a second electrical signal, to indicate water leakage at the non-sealed end 41 corresponding to the sensing circuit board 10. The processing module 3 outputs an alarm information based on the second electrical signal and implements corresponding protective measures.

[0052] like Figure 2 and Figure 3As shown, according to an embodiment of the present invention, the output terminal of the first detection electrode 111 is kept disconnected from the first power ground terminal P1-GND when there is no water seepage. When there is water seepage, the output terminal of the first detection electrode 111 is connected to the second detection electrode 112 through water, and a detection circuit is formed with the first power ground terminal P1-GND through the third resistor.

[0053] According to an embodiment of the present invention, the third resistor is a water resistor. The first detection electrode 111 and the second detection electrode 112 are bare wires. In the event of water seepage, the output terminal of the first detection electrode 111 forms a detection circuit with the first power supply ground terminal P1-GND through the water resistor.

[0054] According to an embodiment of the present invention, a detection circuit is formed by a first power supply P1, a first resistor R1, a light-emitting element, a first detection electrode 111, a water resistor, a second detection electrode 112, and the first power supply ground terminal P1-GND. In the event of water seepage, the light-emitting element is illuminated, and in response to the light signal, the third and fourth electrodes are turned on. The second power supply P2, the photosensitive area, the second resistor R2, and the second power supply ground terminal P2-GND form a circuit, outputting a second electrical signal characterizing the occurrence of water seepage.

[0055] According to an embodiment of the present invention, a first power supply and a first power supply ground terminal are independently configured for the light-emitting element, and a second power supply and a second power supply ground terminal are independently configured for the receiving element, so that the light-emitting element and the receiving element are completely electrically isolated, which can protect the back-end circuit of the optocoupler, and also make the transmission paths of the first electrical signal and the second electrical signal completely independent, thereby improving the quality and reliability of signal transmission.

[0056] According to an embodiment of the present invention, the sensing circuit board 10 is configured to output a third electrical signal via the transmission layer 12 when no water is detected by the detection layer 11; and the optocoupler unit 21 is further configured to output a fourth electrical signal in response to the third electrical signal, wherein the fourth electrical signal is used to indicate that no water has seeped into the unsealed end 41 corresponding to the sensing circuit board 10.

[0057] Figure 4 A schematic diagram of a conversion module according to an embodiment of the present invention is shown.

[0058] like Figure 4As shown, in one embodiment, the underwater device can be cylindrical, and the sidewall shell of the underwater device can be an integral design. The underwater device can include two unsealed ends, such as a top cover and a bottom cover. The top cover and bottom cover are structurally sealed, for example, through component fitting and sealing strips, to ensure the watertight performance of the underwater device. The potential water seepage surfaces of the underwater device are concentrated at the edges of the top cover and bottom cover. A ring-shaped sensing circuit board matching the shape of the top cover and bottom cover can be provided. The circuit board shape and size of the sensing circuit board are closely fitted to the inner wall of the underwater device, and the detection layer of the sensing circuit board is as close as possible to the top cover and bottom cover to ensure highly sensitive detection of watertightness even in the event of minor water seepage from the top cover or bottom cover.

[0059] like Figure 4 As shown, in one embodiment, the detection module of the watertightness detection device may include two sensing circuit boards. For example, a top cover sensing circuit board and a bottom cover sensing circuit board are respectively provided on the top cover and bottom cover of the underwater device. The top cover sensing circuit board includes a first detection electrode for the top cover, for example, an outer ring of the top cover. The top cover sensing circuit board includes a second detection electrode for the top cover, for example, an inner ring of the top cover (not shown in the figure). The bottom cover sensing circuit board includes a first detection electrode for the bottom cover, for example, an outer ring of the bottom cover. The bottom cover sensing circuit board includes a second detection electrode for the bottom cover, for example, an inner ring of the bottom cover (not shown in the figure). The inner rings of the top cover and the bottom cover are connected to a first power supply ground terminal.

[0060] In one embodiment, the top cover inner ring, top cover outer ring, bottom cover inner ring, and bottom cover outer ring can be configured as bare wires with a thickness of 0.5 mm, with a spacing of 0.5 mm between the top cover inner ring and the top cover outer ring. The edge distance between the top cover outer ring and the circuit board of the detection layer of the top cover sensing circuit board is 0.1 mm. The spacing between the bottom cover inner ring and the bottom cover outer ring is 0.5 mm. The edge distance between the bottom cover outer ring and the circuit board of the detection layer of the bottom cover sensing circuit board is 0.1 mm.

[0061] like Figure 4 As shown, in one embodiment, the conversion module includes an optocoupler 20, which may include two optocoupler units, such as a first optocoupler unit and a second optocoupler unit. The first electrode of the first optocoupler unit is connected to the outer ring of the top cover; the second electrode of the first optocoupler unit is connected to a first power supply P1 via a first resistor R1; the third electrode of the first optocoupler unit is connected to a second power supply P2; and the fourth electrode of the first optocoupler unit is connected to the ground terminal P2-GND of the second power supply via a second resistor R2. The first electrode of the second optocoupler unit is connected to the outer ring of the bottom cover; the second electrode of the second optocoupler unit is connected to the first power supply P1 via a fourth resistor R4; the third electrode of the second optocoupler unit is connected to the second power supply P2; and the fourth electrode of the second optocoupler unit is connected to the ground terminal P2-GND of the second power supply via a fifth resistor R5.

[0062] like Figure 4 As shown, in one embodiment, when water seeps into the top cover of the underwater device, and the first detection electrode and the second detection electrode of the top cover circuit board are connected, the outer ring of the top cover is connected to the first power ground terminal, the first pole of the first optocoupler unit is connected to the first power ground terminal, and the output terminal of the first optocoupler unit outputs a water seepage signal.

[0063] like Figure 4 As shown, in one embodiment, when water seepage occurs in the bottom cover of the underwater device, and the first detection electrode and the second detection electrode of the bottom cover circuit board are connected, the outer ring of the bottom cover is connected to the first power ground terminal, the first pole of the second optocoupler unit is connected to the first power ground terminal, and the output terminal of the second optocoupler unit outputs a bottom cover water seepage signal.

[0064] The present invention also provides a water tightness detection method, comprising: for any sensing circuit board in the detection module, which is configured to correspond to at least one non-sealed end of the underwater device, the sensing circuit board outputs a first electrical signal via the transmission layer of the sensing circuit board when water is detected in the detection layer of the sensing circuit board; for any optocoupler unit in the conversion module, which is configured to correspond to at least one sensing circuit board, the optocoupler unit outputs a second electrical signal in response to the first electrical signal, wherein the second electrical signal is used to indicate water leakage at the non-sealed end corresponding to the sensing circuit board; and a processing module outputting alarm information based on the second electrical signal.

[0065] Those skilled in the art will understand that the features described in the various embodiments of the present invention can be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments of the present invention can be combined and / or combined in various ways without departing from the spirit and teachings of the present invention. All such combinations and / or combinations fall within the scope of the present invention.

[0066] The embodiments of the present invention have been described above. However, these embodiments are merely illustrative and not intended to limit the scope of the invention. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the invention, and all such substitutions and modifications should fall within the scope of the invention.

Claims

1. A watertightness testing device, characterized in that, include: The detection module includes a sensing circuit board disposed corresponding to at least one unsealed end of an underwater device, the shape of the sensing circuit board matching the shape of the unsealed end, the sensing circuit board including a detection layer and a transmission layer, the sensing circuit board being configured to output a first electrical signal via the transmission layer when water is detected by the detection layer. A conversion module includes an optocoupler, the optocoupler comprising an optocoupler unit corresponding to at least one of the sensing circuit boards, the optocoupler unit being configured to output a second electrical signal in response to a first electrical signal, wherein the second electrical signal is used to indicate water leakage at a non-sealed end corresponding to the sensing circuit board; and The processing module is configured to output alarm information based on the second electrical signal; The detection layer is provided with a first detection electrode and a second detection electrode. The first detection electrode is connected to the transmission layer via a first lead-out hole, and the second detection electrode is connected to the transmission layer via a second lead-out hole. When the first detection electrode and the second detection electrode are connected by water, the sensing circuit board is configured such that the detection layer outputs a first electrical signal via the transmission layer; The non-sealed end is ring-shaped. The first detection electrode is a first detection ring formed by wiring on a printed circuit board, and the second detection electrode is a second detection ring formed by wiring on a printed circuit board. The wiring of the first detection ring extends to the first lead-out hole of the transmission layer through a notch area provided in the second detection ring, and the wiring of the second detection ring extends to the second lead-out hole of the transmission layer.

2. The water tightness testing device according to claim 1, characterized in that, The first detection ring and the second detection ring have the same ring width, and / or the first detection ring and the second detection ring are spaced apart by a first predetermined distance.

3. The water tightness testing device according to claim 1 or 2, characterized in that, The detection layer faces the unsealed end, the transmission layer faces the internal accommodating space of the underwater device, and a sealing strip is disposed between the transmission layer and the mounting surface of the sensing circuit board.

4. The water tightness testing device according to claim 1 or 2, characterized in that, The optocoupler unit includes: A light-emitting element, comprising a first electrode connected to the first detection electrode and a second electrode connected to a first power supply via a first resistor, configured to convert the first electrical signal into a light signal and output the light signal; and The receiving element includes an output terminal connected to the processing module, configured to convert the optical signal into the second electrical signal and output the second electrical signal.

5. The water tightness testing device according to claim 4, characterized in that, The receiving element includes: Connect the third pole of the second power supply; The fourth pole is connected to the second power supply ground terminal via the second resistor; and The photosensitive region is configured to respond to the optical signal by controlling the third and fourth electrodes to conduct and output the second electrical signal.

6. The water tightness testing device according to claim 4, characterized in that, The output terminal of the first detection electrode remains disconnected from the first power supply ground terminal when there is no water seepage. When there is water seepage, the output terminal of the second detection electrode is connected to the first detection electrode and the second detection electrode through water, and forms a detection circuit with the first power supply ground terminal through the third resistor.

7. The water tightness testing device according to claim 1 or 2, characterized in that, The sensing circuit board is configured to output a third electrical signal via the transmission layer when no water is detected by the detection layer; and The optocoupler unit is further configured to output a fourth electrical signal in response to the third electrical signal, wherein the fourth electrical signal is used to indicate that there is no water leakage at the non-sealed end corresponding to the sensing circuit board.

8. A method for testing water tightness, characterized in that, include: For any of the sensing circuit boards in the detection module that are configured in relation to at least one unsealed end of the underwater device, the sensing circuit board outputs a first electrical signal via the transmission layer of the sensing circuit board when water is detected in the detection layer of the sensing circuit board. For any one of the optocoupler units in the conversion module that corresponds to at least one of the sensing circuit boards, the optocoupler unit responds to the first electrical signal and outputs a second electrical signal, wherein the second electrical signal is used to indicate water leakage at the unsealed end corresponding to the sensing circuit board; and The processing module outputs alarm information based on the second electrical signal; The detection layer is provided with a first detection electrode and a second detection electrode. The first detection electrode is connected to the transmission layer via a first lead-out hole, and the second detection electrode is connected to the transmission layer via a second lead-out hole. When the first detection electrode and the second detection electrode are connected by water, the sensing circuit board is configured such that the detection layer outputs a first electrical signal via the transmission layer; The non-sealed end is ring-shaped. The first detection electrode is a first detection ring formed by wiring on a printed circuit board, and the second detection electrode is a second detection ring formed by wiring on a printed circuit board. The wiring of the first detection ring extends to the first lead-out hole of the transmission layer through a notch area provided in the second detection ring, and the wiring of the second detection ring extends to the second lead-out hole of the transmission layer.

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