EP1529269B1 - Vorrichtung zur detektierung des sturzes eines körpers in ein schwimmbad - Google Patents

Vorrichtung zur detektierung des sturzes eines körpers in ein schwimmbad Download PDF

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EP1529269B1
EP1529269B1 EP03755639A EP03755639A EP1529269B1 EP 1529269 B1 EP1529269 B1 EP 1529269B1 EP 03755639 A EP03755639 A EP 03755639A EP 03755639 A EP03755639 A EP 03755639A EP 1529269 B1 EP1529269 B1 EP 1529269B1
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value
comparator
counter
microprocessor
signal
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French (fr)
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EP1529269A2 (de
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François PHILIPPE
Philippe Montaron
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F and F International Sarl
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F and F International Sarl
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/08—Alarms for ensuring the safety of persons responsive to the presence of persons in a body of water, e.g. a swimming pool; responsive to an abnormal condition of a body of water
    • G08B21/084—Alarms for ensuring the safety of persons responsive to the presence of persons in a body of water, e.g. a swimming pool; responsive to an abnormal condition of a body of water by monitoring physical movement characteristics of the water
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/20—Calibration, including self-calibrating arrangements
    • G08B29/24—Self-calibration, e.g. compensating for environmental drift or ageing of components

Definitions

  • the present invention relates to the detection of shocks in the aquatic environment and relates in particular to a device for detecting the fall of a body such as the fall of a child in a swimming pool.
  • a device for detecting the fall of a body in a swimming pool, in particular the fall of a young child, has been described in the patent application 2,763,684.
  • Such a device comprises means for converting the captured water waves by pickup means into an electrical signal and a differential detector comprising comparison means for comparing the value of a sensitivity threshold with the value of the electrical signal and providing an alarm signal when the electrical signal results from the conversion of a gravitational wave generated by the fall of a body in the pool.
  • the differential detector used in such a device comprises a sensitivity threshold permanently adjusted to its optimum value by the electrical signal generated by the sensing means, which is a function of the disturbances created on the surface of the pool by the atmospheric disturbances such as the bad weather or disturbance caused by the regeneration of the pool water.
  • Such a differential detector is described in PCT patent application WO 01/088870. It includes self-regulating means consisting mainly of an analog-digital converter whose input is connected to the output of an amplifier whose input is connected to the output of the capture of the water waves to output a digital signal depending on the disturbance.
  • a programmed microprocessor provides, in response to the detection of the digital signal provided by the converter, a digital signal at the input "-" of the comparator whose pulses have a variable width which increases with the duration and the importance of the disturbance so as to automatically increase the triggering threshold of the alarm device and thus reduce its sensitivity when the acoustic sensor detects an atmospheric disturbance such as wind or a disturbance due to the pool water regeneration system.
  • Such a device works perfectly when the disturbance detected at the input passes to its optimum phase in a regular manner. Unfortunately, when the system of pool filtration starts (abruptly most of the time), or when the atmospheric disturbance is triggered suddenly, the device does not have time to increase its sensitivity threshold before the alarm system does goes off unexpectedly.
  • a device for detecting the fall of a child in a swimming pool must be completely reliable, that is to say, it must detect this fall in a certain way. It is therefore necessary that such a device recognizes unequivocally, that is to say with a reliability equal to 100%, the "signature" caused by the fall of a child in the pool.
  • the object of the invention is to provide a device for detecting the fall of a child in a swimming pool that can recognize this fall without any ambiguity while continuing its self-regulation continually so as to avoid any inadvertent triggering.
  • the object of the invention is therefore a device for providing an alarm signal during the detection of a gravitational wave generated by the fall of a body in a swimming pool comprising a means of collecting water waves placed under the pool water surface, a means for converting the water waves picked up by the sensing means into an analog electrical signal, and a differential detector comprising comparison means for comparing the sensitivity threshold value of the differential detector with the analog electrical signal value and provide the alarm signal when the analog electrical signal exceeds the sensitivity threshold value.
  • the differential detector comprises self-regulating means constituted mainly of an analog-digital converter receiving as input the analog electrical signal previously amplified and outputting a digital signal when a disturbance occurs in the water, a comparator whose "+” input receives the previously amplified analog electrical signal and a microprocessor programmed to provide, in response to the detection of the digital signal provided by the converter, a digital signal at the input "-" of the comparator whose output pulses have a variable width which increases according to the duration and importance of the disturbance so as to automatically increase the triggering threshold alarm means and thus reduce the sensitivity of the device when the sensing means detects an atmospheric disturbance such as wind.
  • the microprocessor triggers the alarm means when the width of the comparator output pulses is larger than a predetermined critical reference and the frequency F of the analog electrical signal is between two predetermined values F1 and F2.
  • the device comprises an elbow pipe 10 whose vertical part is immersed in the water so that the inlet of the tube is a few centimeters below the surface. water from the pool.
  • the tube is connected at its outer end to a chamber 12 in which there is a microphone 13 connected to a differential detector 14.
  • the latter is connected to an alarm means 16 such as a buzzer or a siren or any other device. signaling via a switch 18 for disconnecting the alarm means when the pool is monitored.
  • the level of the water inside the tube 10 is normally stable. But any modification of this level causes a variation of air pressure in the tube and in the chamber 12 and thus gives rise to an emission of acoustic waves which are converted by the microphone 13 into an electrical signal.
  • the gravitational wave generated by the fall of a body (such as a young child) in the water of the pool spreads essentially below the surface of the water. Even if it is visually not very perceptible on the surface, it causes a sudden variation of the level inside the immersed tube by vertical push upwards. A few millimeters of sudden variation of this level are then interpreted by the differential detector as a signal triggering the alarm.
  • the out-of-water portion is preferably a sealed plastic case containing a battery for powering the detector, which battery can be held in charge by a solar sensor serving as the cover to the housing.
  • the device according to the invention consists mainly of the differential detector which is illustrated in FIG.
  • the signals coming from the microphone 13 are transmitted on the one hand to the "+" input of a constant gain amplifier means 20 and on the other hand to the "+” input of an adjustable gain amplifier means 22 via a resistor 24 connected to a voltage of 0.8 volts.
  • the amplifier means 20 is composed mainly of an operational amplifier 26 having between its input “-” and its output a resistor (of a value of 3.3M ⁇ ) and a capacitor (of a value of 1nF) serving as a counter-current. reaction to limit the gain.
  • the input "-" is connected to the ground by via an electrolytic capacitor 28 preventing the amplification of the idle voltage.
  • the amplifier means 22 is composed mainly of an operational amplifier 30 having between its input “-" and its output a resistor (of a value of 4.7M ⁇ ) and a capacitor (of a value of 1nF) serving as counter-current. reaction to limit the gain.
  • the "-" input is connected to the ground by means of an electrolytic capacitor 32 preventing the amplification of the quiescent voltage and a potentiometer 34 from 210 to 10,000 whose adjustment is made according to the local in which the alarm device is installed, the necessary gain of the amplifier means being all the lower as the said room is soundproof.
  • the output of the amplifier means 20 (signal 51) is connected to the input "+" of a comparator 36 whose function is to transform the analog signal supplied by the amplifying means 20 into a binary signal whose width is a function of the importance of the disturbance and which is transmitted to the microprocessor 38 for the purpose of self-regulating the alarm device.
  • the output of the amplifier means 22 is connected to the "+" input of a comparator 44 which converts the analog signal supplied by the amplifier means 22 into a binary signal (signal S4) which is transmitted to the microprocessor 38.
  • a signal corresponding to the fall of a child in the pool is recognized by the microprocessor 38, it transmits a signal by means of alarm 16 which could be a radio transmitter transmitting the alarm signal to a central alarm.
  • the microprocessor 38 is programmed to transmit a signal on its output 42 when it detects a digital signal of value 1 on its input 40 from the comparator 36.
  • This signal is formed of negative pulses of variable width depending on the number and the width of the pulses of value 1 detected on the input 40. Indeed, assuming a sampling of a frequency of 150 Hz of this input, an input bit of a frequency of 15 Hz will be so sampled about 5 times if the received signal is a perfect sinusoid.
  • the pulse width transmitted on line 42 will be increased. In the same way, this width is decreased each time the microprocessor detects the value 0 of the signal on the line 40. It can therefore be seen that the higher the wind, the more the pulses transmitted at the output of the comparator 36 are wider and the more the pulses Negative issues on line 42 are broad as well. This gives a pulse width modulation.
  • the negative pulses transmitted on the line 42 more or less charge the capacitor 46 (of value 1 ⁇ F) through the resistor 48 (4.7 M ⁇ value), which provides a voltage whose value depends on the width of the pulses provided on line 42.
  • the duration during which the microprocessor 38 reacts to the presence of the atmospheric disturbance by transmitting negative impulses more and more wide to integrator 46-48 can be limited to a maximum value such as 10 or 20s.
  • the device comprises a time counter R 50 used by the microprocessor during the self-regulation process and a time counter C 52 used by the microprocessor during a self-regulating phase. calibration of the device performed periodically.
  • an analyzer 54 of the frequency F of the signal received by the device which is used by the microprocessor to activate the triggering of the alarm.
  • the input of the amplifier 36 acts as a threshold making it possible to obtain a pulse S2 of width TS2 shown in the second diagram of FIG. 3.
  • this pulse is taken into account by the microprocessor 38 only if its width exceeds a first reference REF1 so as to decrease the maximum sensitivity, this of in order to avoid an unnecessarily triggering of the device due to errors related to manufacturing constraints and thermal differences.
  • the signal at the output of the amplifier 30 is the sinusoidal signal represented in the first diagram of FIG. 4, it is subject to two thresholds corresponding to two values of the signal S3 at the terminal of the capacitor 32 which make it possible to obtain the pulses illustrated respectively on the second and third diagrams of FIG. 4.
  • the first threshold is a threshold allowing a value REF3 to be obtained below of which the pulse width TS4 obtained at the output of the comparator 44 is not taken into account.
  • the second threshold makes it possible to obtain a REF reference of pulse width above which an analysis of the frequency 1 / T of the waves received by the device is performed and the alarm is triggered if this frequency is between two values. predetermined as will be seen later.
  • the microprocessor checks whether the count C has completed its decrementation to 0 (or its incrementation up to a value maximum), in which case its logical value is 1 (step 60). If this is the case, the auto-calibration phase (B) is initialized after the counter C has been reset (that is, it starts to decrement or to increment), the incrementation of a variable N to N + 7, N being the charging time of the capacitor 46 by the microprocessor and the reset of an OK variable which will be set when the self-calibration has taken place (step 61). Otherwise, the microprocessor checks whether the counter R has completed its decrementation to 0 (or its incrementation to a maximum value) in which case its logic value is 1 (step 62).
  • a variable NS defining the sensitivity level of the device is decremented by 1 and the counter R is activated again (its logical value is at 0) (step 64).
  • the decrementation of 1 corresponds to an increase in the sensitivity of the device.
  • the NS sensitivity level could vary from 0 (maximum sensitivity) to 40 (minimal sensitivity).
  • a decrementation of NS corresponds to a decrease of the threshold 1 of the signal S4 (see FIG. 4).
  • the microprocessor determines whether the signal S4 is equal to 0 (step 66). If this is the case, the microprocessor determines whether the signal S2 is also equal to 0 (step 66). If this is the case, the process is looped back to its starting point without resetting the counter R to zero.
  • the microprocessor determines whether the width TS2 of the pulse S2 (see FIG. 3) is smaller than REF1 (step 70). If this is the case, the method is looped back to its starting point after resetting the counters R and C (step 72).
  • the microprocessor determines whether the width TS4 of the pulse S4 is between the reference values REF2 and REF (step 74). If this is not the case, the microprocessor checks whether the value TS4 is lower than the lower reference REF2 (step 76) below which the perturbation signal in question is not considered to be significant. If this is the case, no action is taken and the process is looped back to its starting point after resetting the R and C counters (step 72).
  • TS4 When the value of TS4 is not less than REF2, ie it is greater than REF, it means that the signal received by the device can be caused by the fall of a body as explained below. .
  • the microprocessor checks whether the frequency F of the received signal is between two limit values F1 and F2 (step 78). If this is the case, it means that the signal results from the fall of a child's body into the pool as explained below and the alarm is triggered (step 80).
  • the NS value of the sensitivity is incremented by 2 (step 82). Such incrementation makes it possible to raise the sensitivity threshold although it could be reduced by one unit when the counter R has already reached 0 or its maximum capacity (step 64). After this incrementation, the process is looped back to its starting point after the counters R and C have been reset (step 72). The reset of the counter R after each incrementation of NS is intended to prevent the increase of the sensitivity of the device is not too fast.
  • the triggering of the alarm is subordinated to the detection of a given frequency of the water waves received by the detector, the determination of this frequency constituting an essential characteristic of the invention. It has indeed been found that the speed of propagation of the water waves on the surface of the water, and therefore their frequency, depends on the volume of water displaced and therefore on the volume and weight of the body falling into the water as well as the height of the fall. Since for a child this height is approximately constant, 10 to 20 cm from the surface of the water, it will not be taken into consideration.
  • the frequency of the aquatic waves is a direct function of the ratio between the weight and the volume of the falling body, that is to say its density.
  • the fall of a stone with a density of 3 produces aquatic waves with a frequency of approximately 0.6 Hz whereas the fall of a balloon having a density of 0.3 produces waves of a frequency of about 2Hz.
  • the frequency of the waves Aquatic is between 0.8Hz and 1.2Hz depending on the distance between the point of impact and the detector.
  • the train of aquatic waves (4 waves in general) received by the detector is represented on the diagram of figure 7. It is seen that the first wave (or water wave) arrives at the detector after about 6s and that the other three waves of the wave train arrive at decreasing intervals T 1 , T 2 and T 3 , the average being about 1.12s , an average frequency of about 0.9 Hz.
  • the frequency of the waves detected by the detector is in fact a function of the distance as represented by the diagram of FIG. 8. The greater this distance, the greater the frequency of the waves. Thus, if the distance goes from 5m to 9m, the frequency of the aquatic waves goes from about 0.9Hz to about 1.15Hz following a logarithmic type curve. Note that this distance should not be too important insofar as the greater this distance, the longer the detection time after the fall is long. As a general rule, the detection time should not exceed 10s.
  • the microprocessor restarts an auto-calibration since the value of the counter C is equal to 1 (see step 60).
  • the microprocessor will have carried out the "watchdog" test (not shown) and proceeded to the initialization if it is the first time there is has auto-calibration.
  • This initialization consists in establishing a variable TX at 90 representing the time in seconds after which the self-calibration can be performed, to zero the variable N representing the charging time of the capacitor 46 by the microprocessor and set to zero the logical variable OK which will be set to 1 when the auto-calibration has taken place (step 84).
  • the first step is to check whether the OK variable is equal to zero (step 86). If it is not the case, the program returns to the main process A (see FIG. 5) of self-regulation. If the variable OK is equal to 0, the microprocessor waits to reach the end of the TX time to continue its progress (step 88). At the end of the TX time, it determines whether the value of S2 is equal to 0 (step 90). If so, it determines whether the value of S4 is 0 (step 92).
  • N is assigned to a constant N 0 which indicates the reference time for the charge of the capacitor 46 making it possible to obtain the maximum threshold at the input "-" of the comparator 44
  • the TX time is set to 5s and the variable N is incremented by 1 (step 94).
  • the program loops back to the TX wait step (step 88). It can thus be seen that the charge time N of the capacitor is incremented every 5s and therefore the sensitivity threshold is decreased, as long as an incident does not occur.
  • the microprocessor decrements the charging time N by 5s so that the "input” - “is significantly lower than the” + “input, the constant N 0 is set to N which thus becomes the new reference value and the variable OK is set to 1 to indicate that the auto-calibration phase is complete (step 96). Then the program is looped back to where it started.
  • the TX wait time is reset to 5s and the variable N is set to the reference value N 0 (step 98). The program is then looped back to its starting point.

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Claims (12)

  1. Vorrichtung, die dazu bestimmt ist, ein Alarmsignal bei der Erfassung einer Gravitationswelle, die durch das Fallen eines Körpers in ein Schwimmbecken erzeugt wird, zu liefern, umfassend ein Mittel (10) zur Ortung der Wasserwellen, das sich unter der Wasseroberfläche des Schwimmbeckens befindet, ein Mittel (13) zur Umwandlung der von dem Ortungsmittel georteten Wasserwellen in ein analoges elektrisches Signal (S1) und einen Differentialdetektor (14), umfassend Vergleichsmittel (20), um den Empfindlichkeitsschwellenwert des Differentialdetektors mit dem Wert des analogen elektrischen Signals zu vergleichen und das Alarmsignal zu liefern, wenn das analoge elektrische Signal den Empfindlichkeitsschwellenwert überschreitet, dadurch gekennzeichnet, dass der Differentialdetektor Autoregulationsmittel, die hauptsächlich von einem Analog-Digital-Umsetzer (36) gebildet sind, der am Eingang das vorher verstärkte analoge elektrische Signal empfängt und am Ausgang ein digitales Signal (S2) liefert, wenn es zu einer Störung im Wasser kommt, einen Komparator (44), dessen Eingang "+" das vorher verstärkte analoge elektrische Signal empfängt, und einen Mikroprozessor (38) umfasst, der derart programmiert ist, dass er als Antwort auf die Erfassung des vom Umsetzer gelieferten digitalen Signals ein digitales Signal (S3) am Eingang "-" des Komparators liefert, dessen Ausgangsimpulse (S4) eine variable Breite aufweisen, die in Abhängigkeit von der Dauer und der Stärke der Störung größer wird, um automatisch die Auslöseschwelle eines Alarmmittels (16) zu erhöhen und somit die Empfindlichkeit der Vorrichtung zu verringern, wenn das Ortungsmittel eine atmosphärische Störung, wie beispielsweise Wind, erfasst, und wobei der Mikroprozessor derart ausgeführt ist, dass er das Alarmmittel auslöst, wenn die Breite (TS4) der Ausgangsimpulse (S4) des Komparators größer als eine vorbestimmte kritische Referenz (REF) ist und die Frequenz F des analogen elektrischen Signals zwischen zwei vorbestimmten Werten F1 und F2 liegt.
  2. Vorrichtung nach Anspruch 1, bei der der Mikroprozessor (38) ein Empfindlichkeitsniveau (NS) der Vorrichtung zuteilt, wobei das Empfindlichkeitsniveau um 2 inkrementiert wird, wenn die Frequenz F des analogen elektrischen Signals nicht zwischen den vorbestimmten Werten F1 und F2 liegt, während die Breite (TS4) der Ausgangsimpulse (S4) des Komparators (44) größer als die vorbestimmte kritische Referenz (REF) ist.
  3. Vorrichtung nach Anspruch 2, bei der das Empfindlichkeitsniveau durch den Mikroprozessor (38) um 2 inkrementiert wird, wenn die Breite (TS4) der Ausgangsimpulse (S4) des Komparators zwischen einer zweiten vorbestimmten Mindestreferenz (REF2) und der vorbestimmten kritischen Referenz (REF) liegt.
  4. Vorrichtung nach Anspruch 2, bei der das Empfindlichkeitsniveau durch den Mikroprozessor (38) um 2 inkrementiert wird, wenn der Wert der Ausgangsimpulse (S4) des Komparators (44) gleich 0 ist, während der Wert des digitalen Signals (S2) am Ausgang des Analog-Digital-Umsetzers (36) nicht gleich 0 ist und die Breite (TS2) des digitalen Signals kleiner als eine erste vorbestimmte Mindestreferenz (REF1) ist.
  5. Vorrichtung nach Anspruch 4, bei der der Differentialdetektor (14) ferner einen Autoregulationszähler (50) umfasst, der aktiviert wird, um von einer vorbestimmten Kapazität bis zu 0 zu dekrementieren oder von 0 bis zu der vorbestimmten Kapazität zu inkrementieren, wenn der Wert der Ausgangsimpulse (S4) des Komparators (44) gleich 0 ist und der Wert des digitalen Signals (S2) am Ausgang des Analog-Digital-Umsetzers (36) nicht gleich 0 ist und seine Breite (TS2) kleiner als die erste Mindestreferenz (REF1) ist.
  6. Vorrichtung nach Anspruch 3, bei der der Differentialdetektor (14) ferner einen Autoregulationszähler (50) umfasst, der vom Mikroprozessor (38) aktiviert wird, um von einer vorbestimmten Kapazität bis zu 0 zu dekrementieren oder von 0 bis zu der vorbestimmten Kapazität zu inkrementieren (Zähler = 0), wenn der Wert der Ausgangsimpulse (S4) des Komparators (44) ungleich 0 ist, wobei ihre Breite (TS4) kleiner als die zweite vorbestimmte Mindestreferenz (REF2) ist.
  7. Vorrichtung nach Anspruch 5 oder 6, bei der der Zähler (50) nicht aktiviert wird, um zu dekrementieren oder inkrementieren (Zähler 0), wenn der Wert der Ausgangsimpulse (S4) des Komparators (44) gleich 0 ist und der Wert des digitalen Signals (S2) am Ausgang des Analog-Digital-Umsetzers (36) gleich 0 ist.
  8. Vorrichtung nach Anspruch 7, bei der, wenn sich herausstellt, dass der Autoregulationszähler (50) das Dekrementieren oder Inkrementieren (Zähler = 1) beendet hat, das Empfindlichkeitsniveau (NS) vom Mikroprozessor (38) um 1 dekrementiert wird, und der Zähler wieder aktiviert wird, um zu dekrementieren oder inkrementieren (Zähler = 0).
  9. Vorrichtung nach einem der Ansprüche 1 bis 8, ferner umfassend einen Selbsteichungszähler (52), der vom Mikroprozessor (38) aktiviert wird, um von einer bestimmten Kapazität bis zu 0 zu dekrementieren oder von 0 bis zu der Kapazität zu inkrementieren (Zähler = 0), wobei eine Selbsteichung der Vorrichtung durchgeführt wird, wenn der Zähler das Dekrementieren oder Inkrementieren (Zähler = 1) beendet hat.
  10. Vorrichtung nach Anspruch 9, bei der der Wert des Signals (S3), das am Eingang "-" des Komparators (44) geliefert wird, aus der Belastung eines Kondensators (46) mit Impulsen stammt, die vom Mikroprozessor (38) während eines Zeitintervalls N geliefert werden, wobei die Selbsteichung darin besteht, den Wert von N nach einem bestimmten Zeitraum um 1 zu inkrementieren, während die Werte des digitalen Signals (S2) am Ausgang des Analog-Digital-Umsetzers (36) und der Ausgangsimpulse (S4) des Komparators (44) gleich 0 sind.
  11. Vorrichtung nach Anspruch 10, bei der der Wert von N um 5 dekrementiert wird, wenn der Wert des digitalen Signals (S2) am Ausgang des Analog-Digital-Umsetzers (36) gleich 0 ist, während der Wert der Ausgangsimpulse (S4) des Komparators (44) ungleich 0 ist.
  12. Vorrichtung nach einem der Ansprüche 1 bis 11, bei der die vorbestimmten Frequenzen F1 und F2 gleich 0,8 Hz bzw. 1,2 Hz sind.
EP03755639A 2002-07-26 2003-07-25 Vorrichtung zur detektierung des sturzes eines körpers in ein schwimmbad Expired - Lifetime EP1529269B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0209491 2002-07-26
FR0209491A FR2842933B1 (fr) 2002-07-26 2002-07-26 Dispositif de detection de la chute d'un corps dans une piscine
PCT/FR2003/002369 WO2004011949A2 (fr) 2002-07-26 2003-07-25 Dispositif de detection de la chute d'un corps dans une piscine

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EP1529269A2 EP1529269A2 (de) 2005-05-11
EP1529269B1 true EP1529269B1 (de) 2007-03-28

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US (1) US7170416B2 (de)
EP (1) EP1529269B1 (de)
AT (1) ATE358310T1 (de)
AU (1) AU2003273479A1 (de)
BR (1) BR0312986A (de)
CA (1) CA2493962A1 (de)
DE (1) DE60312865T2 (de)
ES (1) ES2285172T3 (de)
FR (1) FR2842933B1 (de)
MA (1) MA27376A1 (de)
PT (1) PT1529269E (de)
TN (1) TNSN05018A1 (de)
WO (1) WO2004011949A2 (de)
ZA (1) ZA200501270B (de)

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FR2884952B1 (fr) * 2005-04-26 2007-07-06 M G Internat Dispositif de detection de la chute d'un corps dans un bassin
WO2008016679A2 (en) * 2006-08-02 2008-02-07 24Eight Llc Wireless detection and alarm system for monitoring human falls and entries into swimming pools by using three dimensional acceleration and wireless link energy data method and apparatus
US20100176956A1 (en) * 2009-01-10 2010-07-15 Richard Moerschell Device for detecting a body fall into a pool
EP2893524B1 (de) * 2012-08-28 2020-06-17 Birchtree, LLC Schockdetektoren
US9506957B1 (en) 2014-08-05 2016-11-29 Aaron Neal Branstetter Floating apparatus for alerting people of the presence of voltage in water
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ATE358310T1 (de) 2007-04-15
FR2842933B1 (fr) 2004-11-19
PT1529269E (pt) 2007-07-11
MA27376A1 (fr) 2005-06-01
WO2004011949A3 (fr) 2004-04-08
ZA200501270B (en) 2006-04-26
AU2003273479A1 (en) 2004-02-16
US20050258968A1 (en) 2005-11-24
DE60312865T2 (de) 2008-01-24
FR2842933A1 (fr) 2004-01-30
TNSN05018A1 (fr) 2007-05-14
DE60312865D1 (de) 2007-05-10
CA2493962A1 (fr) 2004-02-05
EP1529269A2 (de) 2005-05-11
ES2285172T3 (es) 2007-11-16
US7170416B2 (en) 2007-01-30
WO2004011949A2 (fr) 2004-02-05
BR0312986A (pt) 2005-06-14

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