SYSTEM FOR DETECTING AND MEASURING THE FLOODING OF A FLOATING VEHICLE

Abstract

SYSTEM FOR DETECTING AND MEASURING THE FLOODING OF A FLOATING VEHICLE System for detecting and measuring the flooding of a floating vehicle by water, said system comprising: At least three devices for detecting a water height (3) arranged in different zones of a first compartment of a ship, each detection device (3) comprising: a longitudinal body (31) arranged vertically, said longitudinal body (31) having a lower opening allowing an incoming volume of water to move a float (40) along said longitudinal body (31); a float (40) kept free to move in the longitudinal body (31); a sensor (29) measuring and detecting a displacement data of said float (40); A calculator for calculating the change in the water height in real time from all the measurements of each device (3) and estimating the time to reach a given water height. Figure for the abstract: Fig.5

Description

Title of the invention: SYSTEM FOR DETECTING AND MEASURING THE FLOODING OF A FLOATING VEHICLE Field of invention

[0001] The field of the invention relates to that of systems for preventing and informing about damage by flooding of water and / or a fluid on board a floating craft. The field of the invention relates more particularly to that of systems for preventing the sinking of a ship for its evacuation or to carry out a rescue operation. More particularly, the field of the invention relates to that of systems for detecting and measuring the flooding of a floating craft to generate an indicator of the time remaining before the complete flooding of at least one compartment of said floating craft. State of the art

[0002] Currently, systems are known in the prior art which make it possible to detect the presence of water in a compartment of a ship. However, a disadvantage of the existing systems is that they do not make it possible to quantify the level of flooding, that is to say to measure the quantity of water at a given moment on a value of height and / or volume and / or percentage of height.

[0003] There is a difficulty in measuring the quantity of water during an invasion. In particular, a problem with the measurement is linked to its reliability.

[0004] Several problems are likely to alter the measurement of invasion.

[0005] A first problem is linked to the position of the detection; it is possible that the detectors, due to the movement of the ship, do not allow a flooding level to be estimated quickly since the latter may undergo rolling or pitching movements. During flooding, the water entering a compartment may take a certain time before constituting a measurable water level at each point in the compartment. At the start of damage causing a leak in a compartment of a ship, the water may accumulate on one side of the ship and may not be detected immediately if the detection device is located on the opposite side and the floating craft is listing.

[0006] A second problem is related to the reliability of the detection. Indeed, benign waterways may be present and trigger a false detection. For example, water may accumulate in one area of ​​a compartment without a threatening waterway being present.

[0007] Finally, a problem with current systems is that they do not allow the time remaining before a critical flooding of the ship to be assessed, allowing for evacuation, for example.

[0008] There is a need to define a solution for detecting an invasion and reliably monitoring its progress by measuring it. Summary of the invention

[0009] According to one aspect, the invention relates to a system for detecting and measuring flooding of a floating craft by water, said system comprising: • at least two water height detection devices arranged in different areas of a first compartment of a floating craft, each detection device comprising: • a longitudinal body arranged vertically, said longitudinal body comprising a lower opening allowing an incoming volume of water to move a float along said longitudinal body; • a float kept free to move in the longitudinal body, said float comprising means for reflecting a light beam; • an optical transmitter arranged at the upper end of said longitudinal body and generating an optical beam in the direction of said float; • a sensor measuring and detecting the reflected beam; • a clock to measure the round trip time of the beam; • a wired or wireless means of communication to transmit the measured data to a computing unit; • an electrical energy source to power at least the optical transmitter; • remote supervision equipment including: • a communication interface to receive the data emitted by each detection device; • a memory to record the received data; • a calculator to calculate the change in water height in real time from all the measurements of each device and estimate the time to reach a given water height; • an alarm to issue an initial alert in the event of detection of a predefined water height being reached; • a user interface to generate a representation of the level of invasion.

[0010] An advantage is to ensure the detection and measurement of a reliable water height and to allow continuous measurement over time during flooding of a vessel by water.

[0011] According to one embodiment, the optical transmitter is a laser transmitter. An advantage is the reliability and precision of the measurement.

[0012] According to one embodiment, at least one detection device comprises an opening forming a slot and making it possible to view the travel of the float inside the longitudinal body. An advantage is to facilitate maintenance operations and checking the correct operation of the float.

[0013] According to one embodiment, four detection devices are arranged at the four corners of a first compartment. An advantage is to carry out a reliable measurement whatever the roll or pitch of the ship.

[0014] According to one embodiment, three detection devices are arranged in three positions of a first compartment. An advantage is to achieve a good compromise between the number of devices to be installed and the accuracy of the measurement.

[0015] According to one embodiment, the calculator performs a calculation of a weighted average of the water level measured by all of the detection devices arranged in the first compartment to calculate the average water flooding in said compartment. An advantage is to calculate the water level at the center of the axis of a compartment while avoiding fluctuations in the water level in the compartment.

[0016] According to one embodiment, at least one detection device is fixed to a fixed part of the first compartment, said fixing allowing a degree of freedom of said detection device around an axis perpendicular to the ceiling of said first compartment. An advantage is to increase the reliability of the measurement by measuring a water level in a compartment independent of the orientation of the ship.

[0017] According to one embodiment, the system comprises at least one remote console comprising a computer and a graphical interface, the graphical interface representing a plurality of gauges each associated with a compartment, each compartment being equipped with at least one detection device, each gauge being graduated and displayed within a representation of the compartment, the graphical interface also generating a first indicator of the water level present in said represented compartments and a second duration indicator estimating the time after which each compartment will be 100% flooded.

[0018] One advantage is to supervise all the compartments of a ship or more generally of a floating craft in order to measure the criticality of an invasion and to initiate corrective actions as quickly as possible.

[0019] According to one embodiment, an estimation of the flooding of the first compartment at a given proportion of the height of said first compartment is carried out by a series of calculations of the evolution of the water height measured within at least one detection device to deduce therefrom a model of progression or regression of the flooding. An advantage is to predict actions with the greatest possible precision, in particular an evacuation of the ship.

[0020] According to one embodiment, the flooding model is configured to calculate a flooding speed and an acceleration or deceleration of the flooding. An advantage is to measure the progression and the speed of the progression in order to predict a sinking or the irreversibility of the sinking and therefore to anticipate an evacuation of the ship.

[0021] According to one embodiment, an estimate of the total flooding of the first compartment is carried out by a series of calculations of the evolution of the water height measured within at least one detection device.

[0022] According to one embodiment, an estimation of the flooding of the first compartment is carried out by a series of measurements of the water height within a plurality of detection devices, all of the measurements carried out within a plurality of detection devices being used to calculate an average between said measurements in order to produce a model of the evolution of the flooding of a compartment.

[0023] According to one embodiment, the system comprises a computer comparing the measurements of a plurality of detection devices over a predefined period of time, the difference in water levels measured between two detection devices taken in combination with the reading of different positions of the hull of the floating craft on the waterline making it possible to deduce a false detection.

[0024] One advantage is that it makes it possible to detect a false detection and to initiate an action to verify the correct functioning of the system.

[0025] According to one embodiment, the system comprises: • a step of estimating the time remaining before reaching a first data item characterizing the critical stability of the floating device is evaluated in real time, said first data item corresponding to the maximum number of floodable compartments before exceeding a given risk threshold of capsizing of said floating device; • a step of displaying the time remaining before reaching the first data on a display.

[0026] One advantage is that it makes it possible to anticipate whether or not a ship will be evacuated.

[0027] According to one embodiment, the time remaining before reaching a first data item characterizing the critical stability of the floating device is estimated from a set of parameters comprising: • a number of compartment(s) of the floating device, • data characterizing the dynamics of the invasion of each compartment, • of the first data characterizing critical stability,

[0028] said estimation comprising a step of continuous prioritization of the compartments likely to be considered as invaded most quickly in order to estimate and update said remaining time.

[0029] An advantage is to allow a calculation for a large number of ships and to adapt the calculation of critical stability to different ship architectures.

[0030] According to one embodiment, the time remaining before reaching a first datum characterizing the critical stability of the floating device is also estimated from a predefined partitioning factor associated with the floating device.

[0031] According to one embodiment, the float comprises a sustained-release agent, said agent being arranged on the part of the float intended to be submerged during flooding, said sustained-release agent making it possible to modify the transmission of light locally in the volume of water in the vicinity of the float and making it possible to reflect all or part of the laser beam emitted by the optical transmitter.

[0032] One advantage is to increase the reliability of the measurement of the presence of water and the measurement of the water height by ensuring that part of the signal is reflected.

[0033] The system of the invention makes it possible to alert in the event of an invasion being detected. In addition, the data measurement and processing system makes it possible to evaluate and manage an invasion event by means of continuous dynamic animation. It makes it possible to record and store the event in order to reproduce it by software for subsequent data processing. This recorded data can then be used to restore a chronology and the evolution of the invasion. The system of the invention makes it possible to provide comprehensive knowledge of the invasion. This data can be used, for example, for legal or insurance purposes.

[0034] Furthermore, the system of the invention makes it possible to predict the critical moment of stability in order to consider whether or not an evacuation operation. The system for measuring and processing flooding data is an invention that can be installed on existing or to-be-built floating devices, with or without human presence, such as ships, pontoons, buoys, or even drones.

[0035] Another advantage is that the system is easy to install.

[0036] The system for measuring and processing invasion data presented in The invention demonstrates the interest in quantifying an invasion in order to define as precisely as possible the magnitude of the event to inform the coordinator, among others a commander on a ship, who will be required to manage actions. Brief description of the figures

[0037] Other characteristics and advantages of the invention will emerge on reading the detailed description which follows, with reference to the appended figures, which illustrate: [Fig.l]: an example of a representation of a ship in side view within which compartments and detection devices of the invention are represented; [Fig.2]: an example of a representation of a ship in top view within which compartments and detection devices of the invention are represented; [Fig.3A]: an example of a compartment comprising four detection devices arranged at the four corners of the compartment; [Fig.3B]: an example of a compartment comprising four detection devices arranged at the four corners of the compartment such as that of [Fig.3A] and within which a height of water spreads from one of the corners of the compartment; [Fig.4]: an example of a detection device of the invention comprising a slot along the tubular longitudinal body allowing the float to be viewed; [Fig.5]: a representation of an exemplary embodiment of a device of the invention comprising a laser transmitter making it possible to emit a beam reflected on the float for calculating the water height; [Fig.6]: another example of a detection device of the invention comprising an electromagnetism detection system; [Fig.7A]: example of a representation of a detection device of the invention comprising a float in a situation without flooding; [Fig.7B]: an example of another representation of a detection device of the invention comprising a float in a situation where a height of water begins to invade a compartment; [Fig.7C]: an example of another representation of a detection device of the invention comprising a float in a situation where a height of water invades a compartment; [Fig.8]: an example of a graphical interface allowing the visualization of invasion indicators by compartment; [Fig.9]: an example of a ship flooding detection system with a graphical interface allowing flooding indicators to be displayed by compartment; [Fig. 10]: different examples of arrangement and fixing of the detection device in a compartment, [Fig. 11]: an example of a representation of the evolution of the height of an invasion over time in a compartment; • [Fig. 12]: an example of a float comprising a lower part comprising an agent capable of modifying the transmission of light in a medium in which the agent is locally dissolved.

[0038] The "system for detecting and measuring flooding of a floating craft" of the invention is also called a system for measuring and processing flooding data. This latter system comprises a detection and measurement device.

[0039] The “detection and measurement device” of the invention is also called a “detection device”.

[0040] A detector is a piece of equipment comprising a sensor and a calculation means making it possible to transmit a raw or processed measured physical unit to data collection equipment.

[0041] The invention relates to several methods for quantifying any capacity. The main means of measurement are: Radar detection, ultrasonic detection, fluid pressure detection, optical or laser distance detection. The value that is recorded is then transmitted in digital form to a processing unit.

[0042] The present invention favors measurement by laser detection. This measuring means has several advantages over other methods in the context of measuring invasion.

[0043] The laser measurement technique, called optical distance detector, uses the principle of reflection (emission / reception) of a light beam facing a target. The invention describes a laser measurement system which processes the evolution of liquid height and time during a flooding in the compartment of a floating device. This collected value is continuously transmitted to a data processing unit in order to exploit it. The man / machine interface, in a control center, draws the information from this processing unit and displays the results in different modes which can be graphic, reading, dynamic or other and allows to visualize all the information of the flooding event in real time. The reliability of continuous measurement collection is therefore very important, laser measurement makes it possible to obtain this reliability performance.

[0044] [Fig.l] represents a floating craft 1 of the ship type in side view. The invention can be implemented on any type of floating craft, in particular ships comprising a hull having compartments 2.

[0045] A floating craft is described by a hull comprising at least one compartment or a plurality of compartments. A compartment for a floating craft represents the distance and volume between two watertight bulkheads which forms a slice of the hull. Thus, a compartment or a plurality of compartments form a floating craft.

[0046] In the context of the invention, according to one embodiment, each compartment will be provided with at least one optical distance sensor.

[0047] When the measurement is carried out by a single sensor in a compartment, its installation is for example carried out in the center of the axis or as close as possible to the center of the axis of said compartment from a fixed or pendulum connection.

[0048] It is also possible to have two, or even three, preferably four optical distance detectors, denoted DOD, or a plurality of DODs distributed equally in the compartment.

[0049] According to a preferred embodiment, a compartment comprises four DODs. This offers a monitoring and measurement advantage reinforced by an improvement in the detection time but also by the average calculation of the heights which defines a virtual axis center in the compartment center. The choice of having one or more DODs and their position in the compartment can be optimized according to different criteria.

[0050] By "ship" is meant any type of floating craft composed of a hull closed by a deck and comprising at least one compartment. Generally, the ship comprises an emerged structure comprising a cabin, a ship's bridge, a layout and various rooms and a hull consisting of a compartment or more often an assembly of several compartments which is the submerged part, also called "live works". The invention is described with regard to an example of a ship but is intended for any floating craft.

[0051] The main deck delimits the upper part of the submerged compartment(s) of the floating device; it is from the main deck that the freeboard height will be delimited, which is the distance between the water level and the main deck. The buoyancy volume of a floating device is based on the design, control and operation of its compartments.

[0052] These compartments are of several types: • technical compartments: engine room, propulsion room, pump room, etc. are work areas where people must be able to move around and work. • capacity compartments: sea water ballast, fresh water ballast, etc. They are intended to receive liquid volumes: sea water, fresh water, fuel. • the so-called “watertight” compartments are the only compartments provided as a reserve of buoyancy.

[0053] The compartments 2 comprise partitions 4 which may or may not be watertight. The method of the invention makes it possible to consider watertight compartments or groups of compartments forming a single watertight compartment. The invention relates to a system for detecting the flooding of a ship 1 by water introduced into at least one compartment 2 assumed to be watertight.

[0054] The ship 1 of [Fig.l] comprises a plurality of compartments 2 which are separated from each other or from other interior or exterior spaces by partitions 4. The compartments 2 shown in [Fig.l] are all located within the volume formed by the hull. Each compartment 2 is equipped with at least one detection device 3. The detection devices 3 form longitudinal elements extending from the ceiling of a compartment 2 almost to the floor or substantially to the floor of the compartment 2 of the ship 1.

[0055] According to one embodiment, the detection devices 3 comprise an opening 38 at their lower end so that the water entering a compartment 2 also enters the column forming the body 31 of the detection device 3. The detection devices 3 are preferably arranged close to the partitions so that they do not hinder circulation within a compartment 2.

[0056] When the tubular body comprises an opening 38 on the bottom of the tube and / or one or more perforation(s) 43 over its entire length and / or a longitudinal projection 32, this makes it possible to encourage the fluid to progress in the tube over its entire length.

[0057] [Fig. 2] represents a ship 1 in top view representing a section of the ship 1 at the level of the hull, said hull having several compartments 2. Each compartment 2 is delimited by partitions 4 forming watertight walls. [Fig. 2] represents detection devices 3 arranged within the compartments 2, preferably at the corners of the latter. An advantage of an arrangement of detection devices 3 at the corners or near a wall is to have several fixing supports, such as a ceiling light and a partition. Finally, an advantage is to space the detection devices 3 sufficiently far apart from each other so as to obtain different reference measurement points.It is understood that if a detection and measurement device 3 is located in the vicinity of another detection and measurement device 3, the measurement of a water height cannot be representative of the entire flooding of a compartment and more particularly at the beginning of the flooding. It is indeed possible that a presence of water located in a given zone of compartment 2 is trapped due to an obstacle or a position of the ship. In this case, it is possible that the detection of the water height is erroneous or that the detection of a height threshold is delayed. One problem is that material damage is more difficult to repair or address with the quantity of water increasing in the compartment. There is therefore an interest in acting as quickly as possible. possible. Thus, there is an advantage in arranging said detection and measurement devices 3 in opposite positions in the same compartment 2 in order to measure a water height quickly and detect flooding as quickly as possible.

[0058] Thus, when the compartments 2 have two detection devices 3, they will preferably be arranged at the ends of a diagonal of the compartment 2. This arrangement will make it possible to overcome measurement errors linked to the pitching and / or rolling of the ship 1. When a compartment 2 comprises three or four detection devices 3, the system of the invention will preferably comprise an arrangement of the latter in the vicinity of the corners of the compartment 2.

[0059] According to another example illustrated in [Fig.2], a compartment comprises only one detection device 3. In this case, as illustrated, this detection device 3 is preferably arranged in the center of the compartment, that is to say substantially equidistant from each corner of the compartment.

[0060] [Fig.3A] represents such an arrangement of a compartment 2 comprising four detection devices 3 of the invention.

[0061] [Fig.3B] represents a compartment 2 in top view comprising four detection devices distributed at the four corners of said compartment. [Fig.3B] illustrates a volume of water or a height of water 5 having penetrated into the compartment 2 via a waterway. In this example, a quantity of water has agglomerated at a corner of the compartment 2 over a height of a few centimeters. Thus, a detection and measurement device 3 measures a height of water and the other three do not measure any presence of water.

[0062] The system of the invention makes it possible to conclude on one of the following scenarios: • the start of a leak and damage within a compartment is detected in a given compartment; • a measured water height makes it possible to deduce a volume of residual water agglomerated at a given location in the compartment; • false detection due to defective hardware in the detection device.

[0063] Thus, the system of the invention allows a first diagnosis of a situation in order to undertake an operation such as monitoring the measurement to identify the evolution of the flooding of a compartment coming from a water ingress or even human intervention to check the state of compartment 2.

[0064] According to one embodiment, a virtual axis center is generated so as to calculate a level of invasion in said compartment at the virtual axis center. For this purpose, the invasion height can be defined by the average of the heights recorded by each detector monitoring said compartment at the level of the virtual axis center.

[0065] [Fig.4] illustrates a detection device 3 of the invention comprising a body hollow longitudinal body 31 in which a float 40 moves in translation. The section of the body 31 is preferably circular, thus the body forms a hollow cylinder. However, in other embodiments, the hollow body 31 may have a square or rectangular section or any other geometric shape provided that the float 40 also has a geometric shape compatible with that of the body 31 in order to allow the movement of a float 40. In the example of [Fig.4], the hollow body 31 comprises a slot arranged over a predefined length of the detection device 3. One advantage is to allow viewing of the float 40 and possibly to clear the latter in the event of the duct being blocked. In addition, in the context of maintenance, the slot makes it possible to observe the reflection of the laser beam on the target which is the float at rest. This observation makes it possible to verify that the device is operational and calibrated.

[0066] The use of a tubular body 31 makes it possible to protect the reading and the evolution of the level of invasion in the compartment.

[0067] The measuring assembly comprising the tubular body is preferably arranged vertically, fixed to the ceiling or from the ceiling.

[0068] According to one embodiment, a detection device 3 of the invention comprises a head 33 comprising a screen 36 making it possible to display a state of the detection device 3. The display can make it possible to signal an ON / OFF operation, and / or a correct or incorrect power supply, and / or an error or normal state. Finally, the display 36 can indicate a detection level of a water level in the compartment 2 or a duration after which the compartment 2 will be completely flooded. One advantage of such a display is that it makes it possible to inform an operator of the measured data or the operation of the detection device 3 which would intervene on the latter.

[0069] According to one embodiment, the detection device 3 comprises an emitter 34, preferably a laser emitter making it possible to emit a laser beam 37 onto a reflective surface of the float 40 in order to measure the reflected signal to deduce therefrom the round-trip time of the beam 37 and 42 and to deduce therefrom a position of the float 40.

[0070] In this case, the free-moving float in the tubular body serves as a reflection target; it can be equipped with a reflective face to confirm the signal emitted during its reflection. It is the movement of the float in the tube that activates the invasion measurement process; the optical distance detector transmits the collected value to a calculation unit.

[0071] A technique other than laser emission can be used within the framework of the invention, such as acoustic signals, ultrasonic signals, a light signal including structured light, LIDAR or even waves in the ultra-wide band, called UWB.

[0072] The detection device 3 of [Fig.4] also illustrates a junction collar 35 between the frame comprising the electronics of the detection device 3 including the transmitter 34 and the tubular body 31.

[0073] [Fig. 4] shows the detection device 3 in two parts with a section line. However, [Fig. 4] does not show the detection device 3 to scale. The detection device 3 may have different lengths depending on the calibration of the optical distance detector that will be chosen. Generally, the compartment heights in a floating device are between 0 and 10 meters, but may in certain cases go beyond this.

[0074] According to one example, for certain ships, the detection device 3 may for example be of a length substantially between 160 cm and 320 cm, preferably between 200 cm and 260 cm.

[0075] According to another exemplary embodiment, the mounting of the electronic equipment including the sensor / receiver 29 or the detector, the transmitter 34 is carried out so that they are arranged at the upper end of the tubular body 31 approaching the ceiling of the compartment.

[0076] According to another example, the mounting of the electronic equipment including the sensor / receiver 29, the transmitter 34 is carried out so as to be fixed on a tubular body outside said compartment. This mounting has the advantage of isolating the detector from the area to be monitored or measured while maintaining detection efficiency.

[0077] According to one example, said tubular body 31 is fixed to the bottom of the compartment.

[0078] The assembly 3 comprising the electronic equipment including the sensor 29 and the transmitter 34 and the tubular body 31 has the advantage of a small footprint. It can be arranged on any type of existing or to be built floating device. It can be fixed to the ceiling or as close as possible to the ceiling by the simple fixing configuration. According to an example of fixing, a magnetic fixing for a metal support can be implemented. The detector can be arranged outside the compartment and carry out the same measurements efficiently. The detector / tubular body assembly also offers an advantage for the surveillance round, maintenance and test implementation during tests. The continuous measurement precision provided by the laser technique is known, fast and reliable.

[0079] [Fig. 5] illustrates in more detail the operation of the means for measuring the evolution of the travel of the float 40 from the laser transmitter 34. The detection device 3 is in this example fixed to a ceiling light 21 by means of a fixing 20. According to one example, a fixing with dowels or a fixing with studs or by chemical sealing can be carried out. Other fixing techniques are compatible with the invention.

[0080] According to one embodiment, the attachment allows a degree of freedom so that the detection device 3 is pendulum. One advantage is to continue a reliable measurement, regardless of the position of the ship 1 which could be likely to tip over in the event of significant damage.

[0081] According to one embodiment, the detection device 3 is powered by means of an electrical power supply from the compartment 2, here represented by an electrical connector Bh. According to another embodiment, a rechargeable battery can be inserted into a location provided for this purpose on the upper part of the detection device 3. According to one embodiment, the battery is for example placed between the head 33 and the transmitter 34.

[0082] According to one example, a laser transmitter 34 emits a laser beam 37 in a direction directed towards the body 31 so that the latter propagates along the hollow body 31 in which the float 40 is arranged. The float 40 advantageously comprises a reflecting surface 41 which makes it possible to reflect the beam 37 into a reflected beam 42. This reflecting surface forms a reflecting function of the emitted beam to re-emit it, at least a portion towards the receiver arranged at the end of the tube.

[0083] According to another embodiment, the float 40 may comprise an agent capable of modifying the transmission of light when the agent is dissolved locally in a volume of water in the direct vicinity of the float or at the level of the float.

[0084] Such an agent is preferably of the prolonged release type to be released by dissolution automatically upon contact with water in the vicinity of the float or at the level of the float. It is for example in the solid state or in the liquid state.

[0085] Such agents may, for example, be coloring agents, opacifying agents, or goniochromatic agents.

[0086] “Goniochromatic” agents include in particular agents whose surfaces have a pigmented, metallic, pearly or even interferential appearance; these surfaces have the capacity to change appearance depending on the angle of observation.

[0087] Water comprising a volume of agent dissolved locally in a volume of water makes it possible to form a reflective function for a light beam, for example a laser, incident and coming from the emitter in the direction of this volume of water.

[0088] The dissolution of the agent makes it possible to form a volume of locally colored or opacified water. This volume of water then acts as a reflector of a beam emitted by the emitter arranged at the end of the tube. Thus, the float 40, in this embodiment, comprises a function allowing it to create a volume of reflective water thanks to the agent which dissolves on contact with the water.

[0089] The latter can be used in conjunction with a reflective element such as surface 41 or as a substitute for this reflective surface 41.

[0090] The return time of the path taken by the beam makes it possible to directly obtain the position of the float 40 due to the knowledge of the propagation speed of the beam, in particular here the speed of light. Thus, the position of the float 40 can be measured at several times in order to deduce the evolution of the height of the float 40. An advantage is to be able to calculate and predict the duration at the end of which an invasion of the compartment 2 will be completely reached.

[0091] According to one embodiment, a receiver 29 allows the measurement of the return beam 42. This latter receiver 29 is preferably arranged substantially at the same position on the longitudinal axis of the detection device 3 as the transmitter 34. According to one embodiment, a calibration makes it possible to configure the detection device 3 in order to obtain precise measurements of the position of the float 40. This calibration can make it possible to take into consideration the height at which the lower end of the detection device 3 is located above the floor of the compartment 2, the height at which the fixing device 3 is connected, the height of the float 40, the difference in position between the transmitter 34 and the receiver and / or sensor 29. This calibration makes it possible to generate a reliable height of the water height in the compartment 2 from the measurement of the position of the float 40 in the hollow body 31.

[0092] According to one embodiment, in order to save battery or energy consumed in general, the transmitter 34 can be configured to transmit a signal every minute or every two, three, four or five minutes. When a detection of a movement of the float 40 is detected, the emission frequency of the beams is increased so that the monitoring of the evolution of the flooding level can be more precise.

[0093] According to one embodiment, the emitters 34 of each detection device 3 can be synchronized so as to control the laser emitters with offset emissions. One advantage is to spend little energy while emitting frequently. If we consider that the emitters fire a beam every 4 minutes for example and if they are offset by 1 min two by two, this makes it possible to obtain a configuration allowing energy savings while ensuring frequent monitoring of the position of at least one float of one of the four detection devices. This configuration makes it possible not to leave too long a period without checking the level of the float 40.

[0094] According to one embodiment, the float comprises a solid agent for coloring or opacifying the water locally when a compartment is invaded. According to one example, the agent may be of the prolonged-release coloring type, that is to say that it dissolves on contact with water with a certain speed making it possible to prolong the dissolution effect of the latter. An advantage is to make the dissolution phenomenon to increase the probability of detecting the presence of water and measuring the water height in the compartment linked to the movement of the float.

[0095] According to one example, the agent capable of locally modifying the transmission of light in the medium in which it is dissolved is a dye in the solid state.

[0096] According to one embodiment, the agent capable of locally modifying the transmission of light in the medium in which it is dissolved is preferentially arranged in the part of the float intended to be immersed during the flotation of the latter.

[0097] According to one example, it is arranged in an open retention structure, for example a frame comprising openings. The frame may be made of plastic, aluminum, polystyrene or any other suitable material, i.e. promoting flotation and allowing certain parts to be opened to leave the dye in contact with the water.

[0098] An advantage of the agent capable of locally modifying the transmission of light in the medium in which it is dissolved is to opacify the fluid, most often sea water, to facilitate the detection of the fluid level by analyzing the reflection of the laser beam on the sensor. The laser beam, failing to be reflected by the float if the latter is for example blocked or stuck in the tube, will be reflected by the water level opacified by the agent. An advantage is to operate the monitoring of the water level even when the float no longer acts as a reflective element.

[0099] [Fig. 12] represents an embodiment illustrating a float comprising a lower part 72 formed of a prolonged-release coloring agent contained in a cylindrical receptacle extending the shape of the float 40. Any other shape can be used. The agent forming the coloring agent can be, for example, violet, red, black, gray, orange, or any other color making it possible to locally opacify the water to act as a reflector of the emitted wave. The water thus colored or opacified 71 is represented in [Fig. 12].

[0100] The detection device 3 further comprises a communication interface 39 which may be wired or wireless. This communication interface makes it possible to transmit data, in particular data measured or calculated by the computer of an electronic card associated with the transmitter 34 and the laser receiver 29. Thus, the detection device 3 makes it possible to return the calculated values ​​at a given frequency to a remote calculation unit. For example, this remote unit may be a server in a room of the ship 1 dedicated to computer equipment. This equipment may also be located in the cabin.

[0101] The information on the progress of the float in the tubular body 31 during an invasion is transmitted to a computing unit. From a control center, when liquid is present, the first action of the user interface is to broadcast a visual and audible alert.

[0102] One advantage is to collect the monitoring data from the compartments 2 directly within a user terminal or a data processing console of the ship 1. This equipment is preferably located in the cabin. For this purpose, the communication interface may be a Wifi, GPRS, 3G, 4G, Bluetooth, LORA interface, or any other data exchange protocol allowing data to be transmitted. The wireless link may be doubled by a wired link in the case where it is desired to make the system of the invention more robust. According to one embodiment, an Ethernet link may be configured to transmit the data measured and / or calculated by the computer associated with the transmitter / receiver of the detection device 3. According to one embodiment, a single wired link is implemented.

[0103] According to one embodiment, an identifier of the detection device 3 is associated and sent with the data collected by the receiver and / or sensor 34 and possibly used to produce an indicator. The identifier allows the operating console to administer the different detection devices 3 arranged within the ship 1. According to one embodiment, an association between a compartment identifier 2 and a detection device identifier 3 is made. This association of identifiers is recorded in a memory, for example of a remote server SERVi which is located in the ship shown in [Fig.9].

[0104] [Fig. 6] shows another embodiment of detecting the position of a float 40. In this embodiment, the longitudinal body 31 comprises along its wall electromagnetic elements 45 such as magnets. These electromagnetic elements 45 are arranged so as to form markers of the linear distance traveled by the float 40 during its movement. According to this embodiment, the float 40 is provided with a ferromagnetic element 46 fixed on a lateral part of said float 40 so that it is positioned opposite the electromagnetic elements 45. Thus, when the ferromagnetic element 46 is arranged opposite an electromagnetic element 45, the magnetic field produces an induction current which can be measured. If the elements are connected in series or in parallel, it is possible to identify which element 45 is active, i.e. opposite the float 40. The active element is noted 45' in [Fig.6].

[0105] According to one example, the ferromagnetic element 46 may be an annular element fixed to the float 40 when it is of substantially cylindrical shape so that a rotation of the float 40 around a longitudinal axis parallel to the hollow body 31 does not modify the detection configuration. Indeed, in this case a portion of this element 46 will always be opposite an element 45 regardless of its orientation around the longitudinal axis.

[0106] Thus, when the float 40 rises along the longitudinal body 31 towards the ceiling light of the compartment 2, the electromagnetic element 45 opposite the float 40 is activated and a current is produced which generates quantifiable and measurable information. The computer of the detection device 3 is then able to generate information to the communication interface intended for remote equipment so that this information can be analyzed in real time by an operator having an operating console Ti making it possible to administer the different detection devices 3 and control the level of invasion in each compartment 2.

[0107] Still other systems can be used to measure the water height in a compartment 2, in particular by measuring the height of a float 40. The solution of a laser device nevertheless makes it possible to obtain a very good compromise between the reliability of the measurement, low energy consumption and good integration, in particular thanks to a single reflective face on a float 40.

[0108] [Fig.7A] represents an example of configuration of a detection device 3 arranged in compartment 2 without the presence of water. In this case, the float 40 is at its lowest level in the hollow body 31, that is to say closest to the floor of compartment 2. A reference level NIV0 is represented and corresponds to the situation in which no movement of the float 40 within the hollow body 31 has been carried out. In the example of [Fig.7A], the float 40 is retained by two circumferential retaining edges 47. These retaining edges 47 make it possible to maintain the float 40 within the hollow body 31 while allowing water to penetrate into the hollow body during flooding of compartment 2.

[0109] The retaining rim 47 may be circumferential and arranged over the entire end of the hollow body 31. According to another case, the retaining rim 47 may be a simple lug making it possible to obstruct the passage of the float 40 and extending towards the inside of the opening of the hollow body 31. According to another example, the retaining rim 47 may be a rod or a bar forming a diameter of the hollow body 31. In the latter case, the retaining rim 47 is rather presented as a retaining means.

[0110] [Fig.7B] represents a situation in which a volume of water has entered the compartment 2. The detection device 3 detects a movement of the float 40. The height of the float 40 is here represented by a level noted NIVp. In the case of FIGS. 7A, 7B, 7C, it is the upper surface of the float 40 which is considered as the reference. However, according to another embodiment, another reference can be considered, for example the middle of the height of the float 40 or the lower surface of the float 40.

[0111] The travel of the float 40 corresponds to the measured level difference, here represented by a distance dH with di = NIVi - NIV0.

[0112] [Fig.7C] represents a case in which a flooding level of compartment 2 has increased compared to the situation in [Fig.7B]. A new level, noted NIV2, is reached by float 40. The measured water height is noted d2 and corresponds to the difference between level NIV2 and the reference level NIV0. We have d2 = NIV2 - NIVo.

[0113] We then obtain the derivative di / dt = A(NIVi-NIV0) / dt. Thus, with measurements carried out with high frequencies, it is possible to deduce the dynamics of invasion of a compartment 2.

[0114] [Fig. 10] represents different examples of detection devices 3 of the invention represented in the same compartment 2. These different examples make it possible to illustrate different embodiments of the arrangement of these detection devices 3 within a compartment.

[0115] The first example illustrates a method of fixing the detection device 3 by a fixing 201 securing the tubular element 31 with a holding rod extending along an axis parallel to the tube 31 and itself fixed to the ceiling of the compartment. An advantage of this solution is to overcome the height of the column of the detection device 3 sometimes requiring an adaptation of the fixing of the head 33 according to the height at which it is located with respect to the ceiling of the compartment 2. An advantage of this solution is to be compatible with any height of compartment 2.

[0116] A second example illustrates an attachment 202 of the fixing device 3 at the level of the head 33 to the ceiling light. A fixing 202 is made for example by means of a hinge and a system of {screws - nuts] and makes it possible to fix the device to the ceiling of the compartment 2. An advantage of this solution is its small size. Any other fixing than a hinge is compatible with the invention. The second example makes it possible to represent an example of a detection device 3 comprising lateral openings of the perforation type 33.

[0117] A third example illustrates a fastener 203 of the fixing device 3 at the floor level of the compartment 2. A fixing 203 is made for example by means of a hinge and a system of {screws - nuts] and makes it possible to fix the detection device 3 to the floor of the compartment 2. An advantage of this solution is its ease of installation. Any other fixing than a hinge is compatible with the invention. The third example makes it possible to represent an example of a detection device 3 comprising a lateral slot 32.

[0118] A fourth example illustrates a fastener 204 of the fixing device 3 at the ceiling of the compartment 2. A fixing 204 is carried out for example by means of an elastic part fixed to the ceiling of a compartment 2. Such a part can be for example a "Silent block". This part is an elastic part which makes it possible to absorb the noise and vibrations of a possibly moving element. An advantage of this solution is to make it possible to dampen any possible movements of the column 31. Any other fixing comprising an elastic or deforming element can be used within the framework of the invention.

[0119] A fifth example illustrates an attachment 205 of the fixing device 3 at the ceiling of the compartment 2. A fixing 205 is produced for example by means of a part producing a mechanical articulation for example allowing a degree of freedom. This latter fixing is fixed to the ceiling of a compartment 2. This fixing 205 makes it possible to promote the freedom of movement of the tubular element 31. An advantage of this solution is to allow a measurement of a water height in the compartment independently of the inclinations of the floating craft on the water line. Another advantage is not to constrain the detection device 3 of the invention. Any other fixing allowing one or more degrees of freedom can be used within the framework of the invention.

[0120] According to one example, a pendulum attachment of the detector / tubular body assembly may be mechanical, for example a ball joint or a universal joint, but also elastic, for example a rubber or elastomer silent block allowing the entire measuring device freedom of movement.

[0121] The fifth example illustrates a method of fixing the detection device 3 by a fixing 206 securing the tubular element 31 with a lateral partition of the compartment 2. The fixing 206 makes it possible to fix the tubular element 31 to a partition for example by means of at least one holding rod extending for example along an axis perpendicular to the tube 31. An advantage of this solution is to overcome the height of the column of the detection device 3 sometimes requiring an adaptation of the fixing of the head 33 according to the height at which it is located with respect to the ceiling of the compartment 2. An advantage of this solution is to be compatible with any height of compartment 2.

[0122] [Fig.8] represents an embodiment of a user interface representing three gauges 51, 54, 57 measuring the water level in three compartments 2 respectively associated with said gauges. In order to be differentiated for the operator, the compartments 2 are named with dedicated names, here named C01, C02 and C03. Any other name is conceivable according to different embodiments, in particular in order to georeference the compartments in the ship 1. According to an exemplary embodiment, a view of all the compartments 2 of the ship 1 is generated so that the operator has full knowledge of the situation of the ship 1.

[0123] According to one example, the gauges shown advantageously have a geometry specific to or faithful to the surface or volume of the compartment 2 which is associated with the gauge. This association allows the operator to assess the speed of flooding with regard to the height of water measured in the compartment 2 concerned by the damage.

[0124] Each gauge represented within the interface of [Fig.8] illustrates a scale in percentage of total invasion of compartment 2. Thus, it is noted in the example of [Fig.8] that compartment C01 has an invasion level of 40%, compartment C02 has an invasion level of 60% and compartment C03 has an invasion level of 0%. For this, a visual indicator 60 is represented for each gauge, each gauge being associated with a compartment 2. Each gauge comprises a graduation 70 making it possible to assess the position of the indicator 60 and the granularity of this position and its evolution. A set of time indicators 53, 56, 59 are represented in [Fig.8]. Each time indicator indicates the estimated remaining time before the complete invasion of compartment 2.This estimate is made from a plurality of measurements made in real time and allowing the evolution of the invasion to be calculated, including in particular the speed of invasion of compartment 2 and the acceleration, if applicable, of the invasion of compartment 2. [Fig.8] represents three different scenarios.

[0125] The first compartment represented C01 has been flooded to 40% of its total volume deduced from the measurement of the water height. However, the time indicator 53 represents the symbol “infinite” which means that the time after which the total flooding of compartment C01 will be completed cannot be calculated. This therefore indicates that the water ingress is stabilized and that compartment C01 is no longer at risk of total flooding. The stabilization of the water ingress may be linked for example to a clogging of the water ingress or to pumping of water in the compartment. An alert indicator 62 indicates a situation in this compartment with an observed risk: “KO”, due to the detection of a water level within a compartment of the ship. An intermediate means may for example illustrate that the situation is stable.

[0126] The second compartment represented C02 has an invasion level of 60% of the total volume of the compartment deduced from the measurement of the water height. The time indicator 56 indicates a duration of 45 min at the end of which the compartment 2 will be completely invaded. This duration can be calculated by deriving the measurements and predicting on the basis of a predictive curve the time at the end of which the compartment C02 will be completely invaded. The measurements are preferably carried out on a plurality of detection devices 3 of the compartment C02. An alert indicator 63 indicates a situation of this compartment C02 with an observed risk: “KO”, due to the detection of a water level. According to one embodiment, as soon as a detection device 3 detects a movement of the float 40, it passes the state of the indicator alert in a risk situation and possibly emits a visual and / or audible alert. A message can be automatically sent to a messaging server to a plurality of correspondents. A configuration of the system of the invention makes it possible to associate an alert level calculated according to the percentage of invasion with electronic addresses or telephone numbers so that a message is automatically sent.

[0127] The third compartment represented C03 has not been invaded. No water ingress seems to threaten this compartment. The time indicator 59 also indicates an invasion after an infinite time. An alert indicator 64 indicates a situation of this compartment without risk: "OK".

[0128] [Fig. 11] represents a graph allowing the flooding curve to be plotted as a function of time. The curve makes it possible to represent the flooding height in a compartment as a function of time. Such a curve can be characteristic of a type of damage or a location of the damage. One advantage of this representation is that it allows the anticipation of a characteristic evolution in real time or even the analysis of the evolution of the events characterizing the evolution of the flooding a posteriori.

[0129] According to one example, the user interface generates a representation of the compartments of a floating device. Flooding information is generated for each compartment. This information is displayed in real time and is therefore animated over the course of the measured events either by a percentage or a volume or a height represented on the representation of the compartment. According to one example, the dynamic state of progression of the flooding is represented by a rise in water in the compartment accompanied by an active cursor. For another compartment, the invention makes it possible to represent another state, for example by displaying information making it possible to observe the same behavior but in regression of the flooding. For other compartments, a stability symbol may appear, demonstrating that nothing is happening. The graphical interface makes it possible to dynamically display independent states of each compartment according to the measurements taken.

[0130] According to an example, a time value of the total invasion of each compartment appears on the graph. This value will determine the magnitude and dynamics of the invasion, the time information makes it possible to conduct and manage very important actions in these situations. The measurement system has the advantage of reflecting in real time the results for each action carried out, and thus makes it possible not to degrade a situation or to guarantee an action.

[0131] According to an example, on a dedicated page for each compartment, a series of individual information is displayed with among other things: the dynamics of the invasion in mm / sec, the maximum and minimum time value of invasion or regression of invasion, the height of water present in the compartment.

[0132] According to an example, a history of the event for each compartment is displayed by a curve of the invasion in real time. This curve makes it possible to visualize the dynamics of the event over a period of time, in order to best interpret the invasion to plan, conduct actions and decisions.

[0133] The invention adapts to any type of floating craft architecture. In particular, since floating craft do not generally have compartments of the same volumes, shapes, functions and dimensions, the invention adapts to the heterogeneity of architectures. Indeed, the profile of the curve may present a progression, stagnation or regression which depends on the actual flooding of the compartment. The measurement system of the invention provides, by the projection of the curve, multiple information which is not captured by current devices.

[0134] According to one example, recording and storing the invasion provides a better understanding for an individual of the dynamics of invasion. One interest is to understand and model by software the event as a whole, from the start of the invasion through the behavior of the floating device but also through the management of the actions.

[0135] According to one example, the data is stored on several media, for example on a USB key, a voyage data recorder (VDR) and designated in English terminology as a “Voyage Data Recorder”, a type of black box on the floating device, or even a dedicated server on land.

[0136] According to one embodiment, the method of the invention makes it possible to calculate an indicator making it possible to assess whether the partitioning factor has been reached. The partitioning factor defines the number of flooded compartments not to be exceeded after damage; it is generally 1 or 2 compartments, but may vary depending on the floating device considered.

[0137] According to one embodiment, the data measurement and processing system of the invention generates data indicating the conditions predictive of reaching critical stability after damage.

[0138] In this case, the system of the invention integrates knowledge of the partitioning factor of the floating craft into the number of invaded compartments. Thus, by combining the real-time invasion measurement and the integration of the partitioning factor, the system prioritizes the invasion of each compartment and defines the time to reach critical stability.

[0139] Using this information, the data measurement and processing system of the invention generates a time indicator restoring the time remaining before reaching the threshold of critical stability, so the person in charge of the floating device benefits from a decision-making tool in order to prepare or not an evacuation.

[0140] [Fig.9] represents an embodiment of the system of the invention comprising a set of detection devices 3, each being connected to a remote server SERVi for example via a local network NETb Each detection device 3 emits, if applicable, data specific to the measurement of the displacement of the float 40 integrated in said detection device 3. The data are received by the server SERV i and stored in a memory. A calculator Ki makes it possible to aggregate the measurements and to calculate the changes in displacement of the float 40. These changes are compared to characteristics of the compartment 2, such as its height. According to other examples, other characteristics of the compartment 2 can be used or displayed for the operator on the interface. It is understood that a compartment 2 having a low height for an equivalent surface area of ​​a compartment having a greater height will be flooded more quickly for an equivalent waterway.However, a compartment with a low height and large surface area may be 100% invaded after a compartment with a greater height, but with a smaller surface area. The monitoring of the indicator is therefore independent of the surface dimensions of compartment 2, because it is calculated on the evolution of the height of the float 40 and can therefore relate directly to the height of compartment 2.

[0141] The raw data emitted by each detection device 3 or the data calculated by the calculator Ki of the server SERVi are then sent to a user console Ti, also called a user terminal. The latter can be a controller computer in the cabin, but also a digital tablet or a smartphone.

[0142] According to another embodiment, the SERVi server is directly the computer operated by the operator, i.e. the terminal Tb

[0143] The invention finds an advantage in the ability to detect and measure a water height in a compartment of a ship. The invention offers the possibility of visualizing in real time the time corresponding to a "remainder on board" and makes it possible to organize an evacuation in the best conditions. Thus, when an operator knows the time remaining before a compartment is completely flooded, he is able to predict a risk of sinking or to initiate a rescue maneuver. The time remaining before a compartment is completely flooded is crucial data for preventing actions to be taken. The invention allows monitoring of this time. The measurement is reliable and robust due to the different detection devices 3 present in a compartment 2.

Claims

1. Claims System for detecting and measuring flooding of a floating device (1) by water, said system comprising: • at least two water height detection devices (3) arranged in different zones of a first compartment (2) of a floating craft (1), each detection device (3) comprising: • a longitudinal body (31) arranged vertically, said longitudinal body (31) comprising a lower opening (38) allowing an incoming volume of water to move a float (40) along said longitudinal body (31); • a float (40) kept free to move in the longitudinal body (31), said float (40) comprising means for reflecting a light beam; • an optical transmitter (34) arranged at the upper end of said longitudinal body (31) and generating an optical beam (37) in the direction of said float (40); • a sensor (29) measuring and detecting the reflected beam (42); • a clock for measuring the round trip time of the beam (37, 42); • a wired or wireless means of communication (39) for transmitting the measured data to a calculation unit (Ki); • an electrical energy source (Bi) for powering at least the optical transmitter (34); • remote supervision equipment (SERVi) comprising: • a communication interface for receiving the data transmitted by each detection device (3); • a memory to record the received data; • a calculator (KJ) to calculate the change in water height in real time from all the measurements of each device (3) and estimate the time to reach a given water height; • an alarm to issue an initial alert in the event of detection of a predefined water height being reached; • a user interface to generate a representation of the level of invasion.

2. System according to claim 1 characterized in that the optical transmitter is a laser transmitter.

3. System according to claim 1 characterized in that at least one detection device (3) comprises an opening (32) forming a slot and making it possible to visualize the travel of the float (40) inside the longitudinal body (31).

4. System according to any one of claims 1 to 2 characterized in that four detection devices (3) are arranged at the four corners of a first compartment (2).

5. System according to any one of claims 1 to 2 characterized in that three detection devices (3) are arranged in three positions of a first compartment (2).

6. System according to any one of claims 1 to 5, characterized in that the calculator (Ki) performs a calculation of a weighted average of the water level measured by all of the detection devices (3) arranged in the first compartment (2) to calculate the average water invasion in said compartment (2).

7. System according to any one of claims 1 to 6 characterized in that at least one detection device (3) is fixed to a fixed part of the first compartment (2), said fixing (20) allowing a degree of freedom of said detection device (3) around an axis perpendicular to a ceiling (21) of said first compartment (2).

8. System according to any one of claims 1 to 7 characterized in that it comprises at least one remote console (TJ comprising a calculator and a graphical interface (50), the graphical interface (50) representing a plurality of gauges (51, 54, 57) each associated with a compartment (2), each compartment (2) being equipped with at least one detection device (3), each gauge (51, 54, 57) being graduated and displayed within a representation of the compartment (2), the graphical interface (50) also generating a first indicator (60) of the water level present in said compartments represented and a second duration indicator (53, 56, 59) estimating the time after which each compartment (2) will be 100% flooded.

9. System according to any one of claims 1 to 8, characterized in that an estimation of the flooding of the first compartment (2) at a given proportion of the height of said first compartment (2) is carried out by a series of calculations of the evolution of the water height measured within at least one detection device (3) to deduce therefrom a model of progression or regression of the flooding.

10. System according to claim 9 characterized in that the invasion model is configured to calculate an invasion speed and an acceleration or deceleration of the invasion.

11. System according to claim 9 characterized in that an estimate of the total flooding of the first compartment (2) is carried out by a series of calculations of the evolution of the water height measured within at least one detection device (3).

12. System according to claim 9 characterized in that an estimation of the flooding of the first compartment (2) is carried out by a series of measurements of the water height within a plurality of detection devices (3), all of the measurements carried out within a plurality of detection devices (3) being used to calculate an average between said measurements in order to produce a model of the evolution of the flooding of a compartment (2).

13. System according to any one of claims 1 to 12, characterized in that it comprises a calculator comparing the measurements of a plurality of detection devices (3) over a predefined period of time, the difference in water levels measured between two detection devices (3) taken in combination with the reading of different positions of the hull of the floating craft (1) on the water line making it possible to deduce a false detection.

14. System according to any one of claims 1 to 13, characterized in that it comprises: • a step of estimating the time remaining before reaching a first data item characterizing the critical stability of the floating device is evaluated in real time, said first data item corresponding to the maximum number of floodable compartments before exceeding a given risk threshold of capsizing of said floating device; • a step of displaying the time remaining before reaching the first data on a display.

15. System according to claim 14 characterized in that the time remaining before reaching a first data item characterizing the critical stability of the floating device is estimated from a set of parameters comprising: • a number of compartment(s) of the floating device, • data item characterizing the dynamics of the flooding of each compartment, • the first data item characterizing the critical stability, said estimation comprising a step of continuous prioritization of the compartments likely to be considered as flooded most quickly in order to estimate and update said remaining time.

16. System according to any one of claims 14 to 15, characterized in that the time remaining before reaching a first data item characterizing the critical stability of the floating device is also estimated from a predefined partitioning factor associated with the floating device.

17. System according to any one of claims 2 to 16 characterized in that the float comprises a prolonged release agent, said agent being arranged on the part of the float intended to be submerged during an invasion, said prolonged release agent making it possible to modify the transmission of light locally in the volume of water in the vicinity of the float and making it possible to reflect all or part of the laser beam emitted by the optical transmitter.