Water detection sensor, information stake, and water detection system

Abstract

To provide a water detection sensor which can detect a plurality of water levels while suppressing increase of the set cost and of the set space.SOLUTION: The water detection sensor includes a sensor body with a storage unit and a detection unit equipped to the sensor body. The storage unit stores a sensor circuit for outputting the result of water detection, the detection unit has at least three electrode parts for water detection connected to the sensor circuit, and at least one of the electrode parts has a different length from those of the other electrode parts.SELECTED DRAWING: Figure 1A

Description

[Technical field]

[0001] The present invention relates to a water detection sensor that detects water levels and the like, an information stake using the same, and a water detection system. [Background technology]

[0002] In recent years, flood damage and river overflows caused by heavy rain have become frequent, and it is considered important to quickly grasp the water level and flooding conditions and to respond to disasters quickly. Therefore, demonstration experiments are being conducted by the national government, local governments, private companies, etc. to build a system to grasp the flooding conditions using sensors, etc.

[0003] In grasping the flooding situation using the above sensors, systems (water detection systems) have been devised that use, for example, stakes with built-in water detection sensors with communication capabilities (also called information stakes) to detect and transmit information at the site (for example, a water detection sensor stake system using water-pi stakes from Repro Co., Ltd.). The information stakes use IoT technology and are incorporated into management systems that include servers and mobile phones. Water detection systems can be used to monitor reservoirs, rivers, high tides, etc., and can also be used to monitor inland flooding and backwatering caused by torrential rain, underpasses, reservoirs, and the sides of river irrigation channels.

[0004] In a water detection sensor that performs water detection including water level detection, for example, an electrode with an exposed tip is used, and the water surface is detected when the rising water surface touches the electrode. In the conventional technology disclosed in Patent Document 1, water detection (or water surface detection, water level detection) is performed using two electrodes. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2014-215179 A Summary of the Invention [Problem to be solved by the invention]

[0006] The water detection requires only two electrodes, as in the conventional technology disclosed in the above Patent Document 1. However, the conventional technology does not allow detection of multiple water levels. Therefore, in order to detect multiple water levels, multiple water detection sensors must be installed, and installation costs for users such as installers increase almost in proportion to the number of sensors, and the space required for installation also increases almost in proportion to the number of sensors.

[0007] An object of the present invention is to solve the above-mentioned problems of the conventional technology by providing a water detection sensor, information stake, and water detection system capable of detecting multiple water levels while suppressing increases in installation costs and installation space. [Means for solving the problem]

[0008] In order to achieve the above object, the water detection sensor according to the present invention comprises: A sensor body having a storage section; A water detection sensor comprising a detection unit attached to the sensor body, The storage section stores a sensor circuit that outputs a detection result of water detection, The detection unit has at least three electrode parts for detecting water that are connected to the sensor circuit, and at least one of the remaining electrode parts, excluding the longest common electrode, has a different length. In addition, such a water detection sensor includes a storage section in which the water detection sensor is built, An introduction hole for introducing water into the storage portion is provided. This may be achieved by an information stake having water detection capabilities. The common electrode does not have to be the longest electrode, but may be the second longest electrode, and even in this case, the same effects and advantages as those of the above configuration can be obtained.

[0009] As described above, the water detection sensor and the information stake have at least three electrode parts for water detection, and at least one of the remaining electrode parts, excluding the longest common electrode, is different in length. Therefore, for the one electrode (common electrode) which is the longest electrode, there is at least one other electrode whose length is different (shorter) from this. Here, the length of the remaining one or more electrodes other than the one electrode and the other electrodes among the at least three electrode parts is equal to or shorter than that of the one electrode, that is, the same length as the one electrode, the same length as the other electrodes, or a different length (shorter) from these electrodes. When the remaining one or more electrodes are the same length as the one electrode, a water level of a predetermined depth can be measured by the remaining one or more electrodes and the one electrode, while a water level of a different depth can be measured by the one electrode (or the remaining one or more electrodes) and the other electrode. Also, when the remaining one or more electrodes are the same length as the other electrode, a desired water level can be measured by the remaining one or more electrodes and the other electrode, while a water level of a different depth can be measured by the one electrode and the other electrode (or the remaining one or more electrodes). In this way, one water detection sensor can detect two different water levels.

[0010] In addition, if the remaining one or more electrodes are one (called a single third electrode), even if the length of this single third electrode is different from the first electrode and the other electrodes, this single third electrode and the first electrode, and further the single third electrode and the other electrodes, can each detect different water levels, and two water levels can be detected. Furthermore, if the remaining one or more electrodes are multiple (called multiple third electrodes), if even one of these multiple third electrodes has a different length, at least two or more water levels can be detected by a combination of the single electrode and multiple third electrodes, so that overall, three or more water levels can be detected by the one electrode and the other electrodes, and the one electrode and multiple third electrodes. Therefore, the water detection sensor according to the present invention can detect multiple water levels while suppressing increases in installation costs and installation space.

[0011] Since the water detection sensor is realized by the information stake, it can share the function of, for example, a land boundary stake that has location information and is installed in whole or in part, and the water detection sensor can be installed at the desired height or location by driving the stake (information stake) into the ground.

[0012] The water detection sensor may have a communication unit in the storage unit or outside the storage unit that transmits the detection result of the sensor circuit to the outside. This allows the detection result to be transmitted to a location away from the water detection sensor, for example. If the communication unit is outside the storage unit, the communication unit can be installed in a position (within a range) where the communication unit can communicate with a predetermined communication network, for example. Here, the water detection sensor may be incorporated into a water detection system that receives the detection result transmitted from the communication unit of the water detection sensor and presents the detection result to a user. This water detection system allows the detection result to be presented to a user in a remote location by visually displaying the detection result in color or image form through a SNS, web, or a corresponding application (also simply referred to as an app) using a computer, a mobile phone, or the like. For example, the water detection system may include a GIS (geographic information system). The water detection sensor may also include a display unit that displays the detection result of the sensor circuit to the outside. This allows the detection result to be displayed to people around the water detection sensor, for example, by a single color or a multi-color light. The display unit may be attached to the outer surface of the sensor body, provided outside the sensor body, or provided on a substrate inside the sensor body, the whole or part of which is made of a transparent or translucent material.

[0013] The water detection sensor includes a power supply unit that supplies power to the sensor circuit, and the power supply may be turned on and off by a non-contact switch. Conventionally, in order to avoid electrical short circuits due to rain, night dew, etc., there is no power supply on and off switch exposed to the outside, and furthermore, a reed switch or the like is not mounted on the power supply unit. Therefore, the water detection sensor is disassembled and power supply wiring is directly connected to the power supply unit to supply power, which requires the user or worker to disassemble the sensor. However, with the above configuration, unlike the conventional configuration, the power supply on and off operation can be performed from the outside without disassembly and in a non-contact manner. The non-contact switch may be, for example, a switch that is operated by approaching or moving away from a magnet. In this case, in order to reliably grasp the operation of the water detection sensor and the on and off of the power supply, it is preferable that the on and off display (lighting, blinking, etc.) can be confirmed from the outside through a transparent window or the like. Instead of the transparent window, the whole or part of the sensor body may be made of a transparent material or a translucent material. In order to prevent malfunction, it is preferable that the on / off operation caused by the approach and separation be performed in a predetermined procedure.

[0014] The water detection sensor may include at least one of an inclination sensor, a displacement sensor, a GPS sensor, an acceleration sensor, and a vibration sensor that transmits a detection value to the sensor circuit. This allows the water detection sensor to detect the inclination of the center position of a stake when the water detection sensor is built into the stake, the position displacement of the installation point of the water detection sensor, the absolute position, the movement acceleration, and the like. The sensor body may also include a passive type RFID tag. For example, wireless communication using the RFID tag allows the individual ID of each water detection sensor to be read automatically and without contact using a mobile terminal, and the like, reducing the effort required for registering the individual ID of each water detection sensor to a server, cloud, or the like. The registration to the server, cloud, or the like includes position registration and location registration to a GIS (geographic information system) that displays the position information and location information of the water detection sensor and the stake, including GPS position information. The RFID tag may be attached to the outer surface of the sensor body near the upper end on the opposite side to the detection unit, or may be provided inside the sensor body, or may be provided outside the sensor body. This allows the RFID tag to be set at a high position above the ground, and even if the water detection sensor is built into a stake (information stake) (described below), the RFID tag can be set at a high position above the ground.

[0015] In another water detection system, a plurality of the water detection sensors may be provided, and the plurality of water detection sensors may be arranged at different positions in the vertical direction. In this way, more detailed water detection information can be obtained by using the water detection sensors capable of detecting a plurality of water levels, and the height positions of the plurality of water detection sensors are different, so that, for example, more finely detailed water level detection can be achieved.

[0016] In yet another water detection system, a plurality of water detection sensors each having the communication unit may be provided, the plurality of water detection sensors may be arranged at different positions in the horizontal direction, and the detection results may be transmitted from the communication unit. With this configuration, since a plurality of water detection sensors as used in information stakes are provided, more detailed water detection information may be obtained, and for example, more finely detailed water level detection may be possible. Furthermore, since the horizontal positions are different, so-called planar information, for example, information for each location on a map may be obtained, and this information may be utilized. Effect of the Invention

[0017] The water detection sensor, information stake, and water detection system according to the present invention are capable of detecting a plurality of water levels while suppressing increases in installation costs and installation space. [Brief description of the drawings]

[0018] [Figure 1A] FIG. 1 is a schematic external view of a water detection sensor according to an embodiment of the present invention (having three electrode portions). [Figure 1B] FIG. 11 is a schematic external view of a water detection sensor according to another embodiment of the present invention (having four or more electrode portions). [Diagram 2] FIG. 2 is a schematic block diagram (perspective view) showing the internal configuration of the water detection sensor. [Diagram 3] 4A to 4C are diagrams illustrating a non-contact on / off operation of power supply in the water detection sensor. [Figure 4] 13 is a diagram showing an example of an information stake to which the water detection sensor is attached. FIG. [Diagram 5] 2 is a schematic diagram of a water detection system in which the water detection sensor is used. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Fig. 1A shows a schematic external view of a water detection sensor (with three electrode parts) according to one embodiment of the present invention, and Fig. 1B shows a schematic external view of a water detection sensor (with four or more electrode parts; four in the figure) according to another embodiment of the present invention. The water detection sensor is used by being built into something like a stake (such as an information stake) described below, or by being attached with a mounting device such as a cable tie or steel band, or by adhesive, to a pillar-shaped part such as a building, utility pole, guardrail, or fence, a concrete wall of an irrigation channel, or a wall-shaped part such as a retaining wall, etc.

[0020] The water detection sensor can be an environmentally friendly product if it is made of, for example, waste plastic. The water detection sensor has, for example, an outer shape of a so-called PET (polyethylene terephthalate) bottle. This is because the applicant believes that empty PET bottles can be used for the sensor body 200 described below, that if the PET bottle has an image of marine litter, the litter can send a message of protection from disasters, and that the bottleneck-like outer shape of the PET bottle makes it easy to imagine the sensor being installed with its thin tip facing downward. In addition, the sensor body 200 of the water detection sensor may be a so-called flashy color such as red or pink. This is because the applicant believes that such colors have the effect of impressing the installation position on the installer, and that such colors evoke the image of an emergency.

[0021] These figures show a water detection sensor 100 including a sensor body 200 having a storage section 210 described later and a detection section 300 attached to the sensor body 200, in which the detection section 300 has at least three electrode sections 320 for water detection, and at least one of the remaining electrode sections, except for the longest common electrode, has a different length. For example, the sensor body 200 is cylindrical with a diameter of 50 mm, has waterproofness equivalent to IPX7, and has a length of 168 mm including the detection section 300. In addition, for example, the sensor body 200 has two grooves near the upper end on the opposite side to the detection section 300, which are useful for fitting into the grooves when fixing the water detection sensor 100 with the above-mentioned band or the like. The length of the electrode section 320 protruding from the detection section 300 is, for example, 32 mm, and the length can be adjusted by expanding and contracting. In addition, an extension cable (not shown) with a connection terminal may be connected between the detection section 300 and the electrode section 320 to adjust the length. Using this electrode portion 320, sensing (detection) is performed, for example, every 30 seconds, and if water is detected after four consecutive sensing attempts to avoid false detection, the detection results of water detection (detection of submersion, etc.) and recovery from water detection (detection of improvement in submersion, etc.) are output from the sensor circuit 270 described below. The electrode portions 320 are curved in opposite directions to each other, and the width of the space created by the expanded tips of the electrodes reduces false detections caused by, for example, stagnation of water droplets. The common electrode does not have to be the longest electrode, and may be the second longest electrode, and even in this case, the same actions and effects as those of the configuration described below are achieved.

[0022] A pair of electrode parts 320 enables one water detection. In FIG. 1A, there are three electrode parts 320, including electrode parts 320A, 320B, and 320C, and electrode parts 320A (common electrode) and 320C have the same length, and only electrode part 320B has a different length and is shorter than the others. In other words, among the remaining electrode parts except for the longest common electrode 320A, at least one electrode part 320B has a different length from electrode part 320C (same length as electrode part 320A). Note that electrode parts 320A and 320C may have different lengths. This allows one water detection sensor 100 to detect two different water levels, water levels a and b. In FIG. 1B, there are four electrode parts 320, including electrode parts 320D (common electrode), 320E, 320F, and 320G. Electrode part 320E has the same length as electrode part 320D, but electrode parts 320F and 320G have different lengths (the lengths are shorter in this order). In other words, among the remaining electrode parts except for the longest common electrode 320D, electrode parts 320F and 320G have different lengths compared to electrode part 320E (which has the same length as electrode part 320D). This makes it possible to detect three different water levels, water surfaces a, b, and c, with one water detection sensor 100. Furthermore, in FIG. 1B, by comparing the time it takes for the water surface to rise from water surface a to water surface b with the time it takes for the water surface to rise from water surface b to water surface c, it is also possible to grasp the change in the water surface rise speed. Similarly, the change in the water surface fall speed can also be grasped. It should be noted that electrode portion 320C and electrode portion 320A, and electrode portion 320E and electrode portion 320D may be of different lengths, and electrode portion 320F and electrode portion 320G may be of the same length as each other or as electrode portion 320D.

[0023] FIG. 2 shows an example of the internal configuration of the water detection sensor 100 in a perspective view. The water detection sensor 100 in the above two embodiments has the same internal configuration. The storage section 210 in the sensor body 200 in this example includes a sensor circuit 270 that is connected to the electrode portion 320 for water detection and outputs the detection result, a power supply section 250 such as a primary battery or a secondary battery that supplies power to the sensor circuit 270, and a communication section 230 that transmits the detection result of the sensor circuit 270 to the outside of the sensor body 200. The communication section 230 may be located outside the storage section 210 at a predetermined distance, for example, or an antenna (not shown) that is a part of the communication section may be located outside the storage section 210. A display section 290 that displays the detection result of the sensor circuit 270 to the outside may be provided on the outer surface of the sensor body 200. The display section 290 is, for example, an LCD or a plurality of colored LEDs. The detection result here is water detection, submersion detection, water surface detection, etc., and may also include recovery from water detection (detection of improvement in submersion, etc.), and the water level can be detected by water detection. The battery of the power supply unit 250 is a battery that can be used stably for a long time, and preferably has long-term reliability of 5 to 10 years and large capacity.

[0024] The sensor body 200 may be provided with an RFID tag such as a passive type (not shown). For example, the individual ID of each water detection sensor 100 can be read automatically and without contact by a mobile terminal or the like by wireless communication using the RFID tag, and the effort required for registering the individual ID of each water detection sensor to a server, cloud, or the like can be reduced. In this embodiment, the registration to the server, cloud, or the like includes position registration and location registration to the water detection system SYS, which is a GIS (geographic information system) that displays the position information and location information of the water detection sensor and stakes (information stakes, etc.), including GPS position information. The RFID tag may be attached to the outer surface of the sensor body 200 near the upper end on the opposite side to the detection unit 300, or may be provided inside the sensor body 200, or may be provided outside the sensor body 200 away from the sensor body 200. This allows the RFID tag to be set at a high position above the ground, and even when the water detection sensor is built into an information stake (FIG. 4) described later, the RFID tag can be set at a high position above the ground.

[0025] The water detection sensor 100 in each of the above embodiments may include at least one of a tilt sensor, a displacement sensor, a GPS sensor, an acceleration sensor, and a vibration sensor that transmits a detection value to the sensor circuit 270, or a combination of several of these may be used. Here, the water detection sensor 100 includes four sensors, namely, a tilt sensor S1, a GPS sensor S2, a displacement sensor S3, and an acceleration sensor S4. As a result, the water detection sensor 100 can detect the tilt of the center position of a stake (information stake) when the sensor is built into the stake as described later, the positional displacement of the installation point of the water detection sensor 100, the absolute position, and / or the movement acceleration due to a fall or impact. The water detection sensor 100 may have a function of automatically and periodically performing a self-life check according to the detection results including those of other sensors not shown. The results of this self-life check are transmitted through a water detection system or satellite communication described later. For periodic transmission (self-life check), an instruction to change the measurement time can be sent to the water detection sensor from the Web depending on the situation.

[0026] FIG. 3 shows a non-contact power supply on / off operation in the power supply unit 250 that supplies power to the sensor circuit 270 and the like in the water detection sensor 100. The water detection sensor 100 of this embodiment is not provided with a power supply on / off switch that is exposed to the outside. Here, a non-contact switch SW is used that performs the on / off operation of the power supply unit 250 in a non-contact manner by approaching and moving away from the magnet MG. For the magnet MG, for example, a built-in magnet mounted on some smartphones may be used. In addition, in order to avoid malfunction due to unexpected changes in the magnetic field, it is preferable that the magnet MG is approached and moved away at a certain operation procedure, time interval, etc. In this case, in order to reliably grasp the on / off of the power supply, it is preferable that the on / off display can be confirmed from the outside through a transparent window or the like (not shown). In addition, this on / off display may be used to display when water is detected, to display the remaining amount of the power supply battery (consumption amount, reduction amount, stop, etc.), and the like.

[0027] FIG. 4 shows an example of a stake PL in which the water detection sensor 100 is built-in and attached. The stake PL is, for example, an information stake, and may be a marker or sign. The stake (information stake) PL of this embodiment is almost entirely rectangular, but the lower part in the figure is cylindrical or columnar, and the tip part is pointed. Therefore, when installing the stake PL, only the lower part, which is cylindrical or columnar, is stuck into the ground (temporary fixing of the stake PL), the stake PL is rotated to adjust the direction, and then the stake PL is driven into the rectangular part to fix the direction (permanent fixing of the stake PL). The rotation of the stake PL makes it possible to adjust the sensitivity depending on the direction when the water detection sensor 100 communicates. The stake PL has a water detection function by being built-in and attached with the water detection sensor 100 of each of the above embodiments, and is equipped with, for example, a hole-shaped storage section FT in which the water detection sensor 100 is built-in and attached, and an introduction hole HL in the side wall, which is a hole for introducing water from the outside into the storage section FT. The water detection sensor 100 can be built into the pile PL by further attaching a cover CP to the pile PL. The detection sensor 100 detects the intrusion of water from the introduction hole HL, making it possible to detect water in the external environment around the pile PL. If so-called waste plastic or the like is used for this pile PL, it can be an environmentally friendly product.

[0028] FIG. 5 shows a water detection system SYS in which the water detection sensor 100 is used. The water detection system SYS receives the detection result transmitted from the communication unit 230 of the water detection sensor 100, and presents the detection result to the user as described below. In this embodiment, the water detection system SYS is a GIS (geographic information system). The water detection system SYS uses, for example, a low power wide area (LPWA) network such as SIGFOX, which is a wireless communication technology that enables long-distance data communication at low cost and low power consumption. LPWA is attracting attention as one of the communication methods suitable for IoT / M2M. If SIGFOX is used, for example, a gateway 610 described later can be eliminated, and the water detection sensor 100 and a server, cloud, etc. communicate directly one-to-one via a telephone line, etc. In the water detection system SYS, at least the individual ID, installation position, and GPS information (x, y, z coordinate information, etc.) of each water detection sensor are tabulated, listed, etc., and registered in a server, cloud, etc. It should be noted that, through the above-mentioned SIGFOX and other communications, it is possible to use downstream communications to send instructions to the water detection sensor 100 itself for setting and changing the detection sensitivity.

[0029] In the water detection system SYS, the detection result transmitted from the communication unit 230 is first sent via the LPWA gateway 610 to the Internet line 630. The detection result is then stored in the LPWA cloud 650 and / or a server 700 accessible to the LPWA cloud 650, and past data on flooding and the like can be stored. Meanwhile, the server 700 accepts access from the user for presenting the detection result together with location information via, for example, a browser on a personal computer 810 or a dedicated app (application) on a mobile phone 830. For example, a map is displayed on the monitor of the personal computer 810 or the screen of the mobile phone 830, and the location of each water detection sensor 100 is displayed in green, and the detection result is presented by changing the green to red at a location where water is detected due to inland flooding, backwatering, or the like. Also, when the water recedes, the detection result is presented by changing (returning) from the red to green. In addition, the detection results may be presented via social media, etc., which makes it possible to send the detection results only to nearby people or a limited number of others, thereby differentiating them from public information destinations.

[0030] In the water detection system SYS, information (detection result) such as the state of the water level and the inclination of the device from the water detection sensor 100 is periodically confirmed, and if there is a change in state, the detection result is used as a trigger to notify the user by wireless (transmission of emergency notification by wireless). Here, the mobile phone 830 or the like can receive emails including location information from, for example, the server 700 and / or the PC 810, and the above-mentioned notification or notification of the battery state may be sent by email (alert notification email and status improvement notification email). Among these, depending on the detection result, for example, the detection result may be used as a trigger to automatically notify a specified organization or dispatch a drone to the site based on the location information of the installation location (not shown). In addition, in the water detection system SYS, downstream communication is performed by wireless transmission in part (dotted arrow in the figure), and control data including specifications (parameters) such as communication time interval and detection time interval are sent from the server 700 to, for example, the LPWA cloud 650, the LPWA gateway 610, and the water detection sensor 100.

[0031] The water detection sensor 100, stakes PL, and water detection system SYS according to the above embodiment can further provide the following advantages and effects by utilizing, for example, a plurality of water detection sensors 100 and / or information stakes PL. (1) By using a plurality of water detection sensors 100 and information stakes PL, water detection can be covered in a planar form, and a system effective for constructing a so-called mesh network can be constructed. (2) By using a plurality of water detection sensors 100 and information stakes PL, a system can be constructed that can grasp the planar or three-dimensional progress of flooding, and in addition, linkage between adjacent water detection sensors 100 and information stakes PL, use of linkage information by so-called address matching that links point information for each information stake PL to improve information accuracy, and automatic detection using AI (artificial intelligence) and the like are possible. (3) A system that enables linked operation of alert functions by multiple water detection sensors 100 and information piles PL, for example, when the water detection sensor 100 and information piles PL near the upstream detect water, a visual or audio alert such as light can be issued from the downstream water detection sensor 100 and information piles PL by linked operation between the water detection sensors 100 and information piles PL, and a system that enables prediction by actual objects can be provided. (4) Using the above-mentioned GIS, risk can be visualized based on the detection results and detection records of multiple water detections by multiple water detection sensors 100 and information piles PL scattered on a map, and for example, it can be reflected in insurance premium calculations for each area. (5) The idea behind the information piles PL is to connect multiple points (information piles) with lines by communication or the like to capture / cover a vast area such as land, which changes frequently, in an area. This allows the water detection sensor 100, piles PL, and water detection system SYS to significantly improve the scope of use in a synergistic manner, and can contribute to recent severe disasters.

[0032] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims.

[0033] For example, in a water detection system of another embodiment different from the above, a plurality of water detection sensors 100 may be provided, and the plurality of water detection sensors 100 may be arranged at different positions in the vertical direction. In this way, by using the above-mentioned water detection sensors 100 capable of detecting a plurality of water levels and by displacing the positions of the plurality of water detection sensors 100 in the height direction, it is possible to achieve effects such as more accurate and efficient water level detection, more detailed water detection information being obtained, and finer water level detection. [Explanation of symbols]

[0034] 100 Water detection sensor 200 Sensor body 210 Storage area 230 Communications Department 250 Power supply section 270 Sensor Circuit 290 Display section 300 Detection unit 320 Electrode part FT storage section HL introduction hole PL pile (information pile) SW Non-contact switch SYS Water Detection System

Claims

1. A sensor body having a storage section; A water detection sensor comprising a detection unit attached to the sensor body, The storage section stores a sensor circuit that outputs a detection result of water detection, The detection unit has at least three electrode parts for detecting water connected to the sensor circuit, and at least one of the remaining electrode parts except for the longest common electrode has a different length. Water detection sensor.

2. 2. The water detection sensor according to claim 1, A communication unit for transmitting the detection result of the sensor circuit to an outside is provided in the storage unit or outside the storage unit. Water detection sensor.

3. 2. The water detection sensor according to claim 1, a display unit that displays the detection result in the sensor circuit to the outside; Water detection sensor.

4. 2. The water detection sensor according to claim 1, A power supply unit is provided to supply power to the sensor circuit, and the power supply is turned on and off by a non-contact switch. Water detection sensor.

5. 2. The water detection sensor according to claim 1, At least one of a tilt sensor, a displacement sensor, a GPS sensor, an acceleration sensor, and a vibration sensor is provided to send a detection value to the sensor circuit. Water detection sensor.

6. 2. The water detection sensor according to claim 1, The sensor body is provided with an RFID tag. Water detection sensor.

7. A storage section in which the water detection sensor according to claim 1 is built in; An introduction hole for introducing water into the storage portion is provided. An information pile with water detection function.

8. a detection unit that receives the detection result transmitted from the communication unit of the water detection sensor according to claim 2 and presents the detection result to a user; Water detection system.

9. A water detection device according to claim 1, comprising a plurality of water detection sensors, the plurality of water detection sensors being arranged at positions offset in a vertical direction. Water detection system.

10. a plurality of water detection sensors according to claim 2 are provided, the plurality of water detection sensors are arranged at different positions in a horizontal direction, and the detection result is transmitted from the communication unit; Water detection system.

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