FR2771887A1 - Underwater noise surveillance system - Google Patents

Underwater noise surveillance system Download PDF

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Publication number
FR2771887A1
FR2771887A1 FR9715254A FR9715254A FR2771887A1 FR 2771887 A1 FR2771887 A1 FR 2771887A1 FR 9715254 A FR9715254 A FR 9715254A FR 9715254 A FR9715254 A FR 9715254A FR 2771887 A1 FR2771887 A1 FR 2771887A1
Authority
FR
France
Prior art keywords
seismic
hydrophonic
background noise
signal
fall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
FR9715254A
Other languages
French (fr)
Inventor
Robert Louis Marchand
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to FR9715254A priority Critical patent/FR2771887A1/en
Publication of FR2771887A1 publication Critical patent/FR2771887A1/en
Pending legal-status Critical Current

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Classifications

    • 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
    • G08B21/082—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 electrical characteristics of the water
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/001—Acoustic presence detection
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
    • G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
    • G08B13/1663—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using seismic sensing means

Abstract

The phase subtraction of seismic noise technique cancels out seismic background noise whilst allowing the detection of someone falling in the water.

Description

DISPOSITIF ET PROCEDE POUR CORRIGER LE SIGNAL
DE SORTIE HYDROPHONlQUE D1 UN SYSTEME DE SURVEILLANCE DE E CHATTE DANS UN PLAN D'EAU, UNE
PISCINE OU UN BASSIN EN ELIMINANT LE BRUIT DE
FOND SISMIQUE PARASITE
La présente invention concerne la sécurité personnes au abords des plans d'eau piscines et des bassins , en effet trop d'accidents concernent les jeunes enfants et les personnes qui ne savent pas nager tombent dans un plan d'eau, une piscine ou un bassin se noient faute que les secours soit alertés.DEVICE AND METHOD FOR CORRECTING THE SIGNAL
HYDROPHONIC OUTPUT OF A SYSTEM FOR MONITORING PUSSY IN A BODY OF WATER, A
POOL OR POOL BY ELIMINATING THE NOISE OF
PARASITE SEISMIC BACKGROUND
The present invention relates to the safety of people near swimming pools and basins, indeed too many accidents concern young children and people who cannot swim fall into a body of water, a swimming pool or a basin. drown if the emergency services are not alerted.

Pour pouvoir détecter la chute d une personne dans la piscine ou le bassin la présente invention utilise un dispositif hydrophonique immergé soit a l'aide d une bouée ou fixe sous la surface recueillant les vibrations Hydrophoniques généré par la chute d 'une personne dans le volume d'eau surveillé et des vibrations parasites dues au bruit de fonds sismique présent dans la zone surveillé et a éliminer du signal de sortie le bruit de fond sismique de l'environnement en utilisant le couplage d'un ou plusieurs capteurs sismiques (accéléromètres) solidaires des parois ou du fond et protégés des vibrations Hydrophoniques généré par la chute d'une personne dans le plan d'eau surveillé, reliés a un dispositif de traitement du signal générant une alarme de chute dans la zone surveillé
On comprendra que les signaux Hydrophoniques devant être analysés sont des vibrations et que les vibrations dues au bruit de fond sismique produisent également un signal de nature vibratoire et que lorsque par exemple quand un dispositif hydrophonique est immergé dans une piscine ou un bassin ce dispositif subit des vibrations dues au bruit de fond sismique.To be able to detect the fall of a person in the swimming pool or the basin the present invention uses a hydrophonic device immersed either with the aid of a buoy or fixed under the surface collecting the Hydrophonic vibrations generated by the fall of a person in the volume of monitored water and parasitic vibrations due to seismic background noise present in the monitored area and to eliminate from the output signal the seismic background noise of the environment by using the coupling of one or more seismic sensors (accelerometers) integral walls or bottom and protected from Hydrophonic vibrations generated by the fall of a person in the monitored water body, connected to a signal processing device generating a fall alarm in the monitored area
It will be understood that the hydrophonic signals to be analyzed are vibrations and that the vibrations due to seismic background noise also produce a signal of a vibratory nature and that when, for example when a hydrophonic device is immersed in a swimming pool or a basin, this device undergoes vibrations due to seismic background noise.

La solution du problème de la détérioration du signal hydrophonique par un bruit de fond sismique parasite selon la présente invention réside dans une élimination de signal active et montre comment on peut utiliser un ou plusieurs capteurs sismique de bruits de fond sismique du a l'environnement
La presente invention a trait en particulier ,a un procédé et a un moyen pour corriger le bruit dc fond sismique généré par les groupes de filtration ou l'activité humaine ou naturelle qui capté par un ou plusieurs hydrophones en diminue considérablement les performances au fréquences du bruit de fond sismique.The solution to the problem of the deterioration of the hydrophonic signal by a parasitic seismic background noise according to the present invention lies in an active signal elimination and shows how one or more seismic sensors of seismic background noise due to the environment can be used.
The present invention relates in particular to a method and a means for correcting the seismic background noise generated by filtration groups or human or natural activity which picked up by one or more hydrophones considerably reduces the performance at frequencies of the seismic background noise.

Le procédé de correction du signal hydrophonique de surveillance de chute selon la présente invention consistc en une correction active en utilisant un ou des capteurs sismiques (accéléromètres) protégés de la pression hydrophonique et en appliquant le signal du bruit de fond sismique en opposition de phase par l'intermédiaire d un dispositifélectronique gérant la correction du signal hydrophonique aux fréquences du bruit de fond sismique.The method for correcting the hydrophonic fall monitoring signal according to the present invention consists of an active correction using one or more seismic sensors (accelerometers) protected from the hydrophonic pressure and by applying the signal of the seismic background noise in phase opposition by through an electronic device managing the correction of the hydrophonic signal at the frequencies of the seismic background noise.

Le procédé et le système peuvent ,en réalité varier bien entendu dans le cadre de la présente invention mais ,pour permettre de mieux comprendre cette dernière ,on va décrire ci après un mode de réalisation en se référant aux dessin annexé, sur lequel:
La Figure 1 est une vue schématique illustrant 1 invention d une manière générale.The method and the system may, in reality of course vary within the scope of the present invention but, to allow a better understanding of the latter, an embodiment will be described below with reference to the appended drawing, in which:
Figure 1 is a schematic view illustrating the invention in general.

La Figure 2 est un schéma synoptique de l'appareil de 1 invention.Figure 2 is a block diagram of the apparatus of the invention.

La Figure 3 est un schéma de principe montrant une application typique de l'invention.Figure 3 is a block diagram showing a typical application of the invention.

On va se référer tout d'abord a la figure 1 pour donner un aperçu de la technologie de l'invention la formule; SBH+SSOP-SHC, démontre les principes de mise en oeuvre:
Soit SBH = Signal Brut capte par le ou les Hydrophones avec
le bruit de fond sismique sismique
Soit SSOP = Signal du ou des capteur Sismique en Opposition de
Phase par rapport a un ou les hydrophones
Soit SHC = Signal Hydrophonique Corrigé
En effet ajouter en opposition de phase le signal du ou des accéléromètres pour en soustraire le bruit de fond sismique généré par ,les groupes de filtration ou l'activité humaine ou naturelle au signal capté par le système hydrophonique en augmente considérablement les performances dans la gamme de réponse du ou des accéléromètres.We will first refer to Figure 1 to give an overview of the technology of the invention the formula; SBH + SSOP-SHC, demonstrates the principles of implementation:
Either SBH = Raw Signal picked up by the Hydrophone (s) with
seismic background noise seismic
Either SSOP = Signal of the Seismic sensor or sensors in opposition to
Phase with respect to one or more hydrophones
Either SHC = Corrected Hydrophonic Signal
In fact, adding the signal from the accelerometer (s) in phase opposition to subtract the seismic background noise generated by it, filtration groups or human or natural activity from the signal picked up by the hydrophonic system considerably increases performance in the range response of the accelerometer (s).

En se référant maintenant a la figure 2 qui montre un des schéma possibles de l'agencement de l'invention, on voit que: le ou les capteur Hydrophoniques 1 produit en 2 un Signal Brut capte par le ou les Hydrophones avec le bruit de fond sismique tandis que le ou les capteurs sismique 3 produisent en 4 le Signal en Opposition de Phase par rapport a un ou plusieurs hydrophones 1. le bruit de fond sismique est soustrait en 5 du signal du ou des
Hydrophones avec le bruit de fond sismique généré par l'environnement.Referring now to FIG. 2 which shows one of the possible diagrams of the arrangement of the invention, it can be seen that: the hydrophonic sensor (s) 1 produces in 2 a raw signal picked up by the hydrophone (s) with the background noise seismic while the seismic sensor or sensors 3 produce in 4 the Signal in Phase Opposition with respect to one or more hydrophones 1. the seismic background noise is subtracted in 5 from the signal of the
Hydrophones with background seismic noise generated by the environment.

La présente invention comprend dans un boîtier 6 isolant des vibrations un ou des capteurs sismiques isolés des vibrations
Hydrophoniques généré par la chute d'une personne de manière que ces capteurs sismique reçoivent que les vibration due au bruit de fond sismique et pas le signal hydrophonique du plan d'eau surveillé.The present invention comprises, in a vibration isolating box 6, one or more seismic sensors isolated from vibrations.
Hydrophonic generated by the fall of a person so that these seismic sensors receive only the vibration due to the seismic background noise and not the hydrophonic signal of the body of water being monitored.

Le signal du ou des capteurs sismiques est filtré et amplifie pour
donner le niveau correct puis soustrait du signal hydrophonique
brut capte par le ou les hydrophones et analyse par l électronique
de détection de chute The signal from the seismic sensor (s) is filtered and amplified to
give the correct level then subtract from the hydrophonic signal
gross picked up by the hydrophone (s) and analyzed by the electronics
fall detection

Claims (3)

Revendications 1. procédé de correction de signal de sortie hydrophonique du bruit de fond parasite des vibrations sismique caractérisé par le fait que l'ont forme un système hydrophonique a soustraction des vibrations sismiques en ajoutant en opposition de phase le signal d un ou plusieurs capteurs sismiques en annulant ainsi du signal de sortie les vibrations du bruit de fond sismiques rayonné par 1 environnement 2. procédé selon la revendication 1 caractérisé par le fait que 1 ont place un ou plusieurs détecteurs sismique dans une enceinte ,boite ou tout moyen de d enveloppement de manière qu'il soient actionné par les forces d'accélérations dues au bruit de fond vibratoire sismique mais qu'il il soit protégé vis a vis des signaux Hydrophoniques.Claims 1. Method for correcting the hydrophonic output signal of the parasitic background noise of seismic vibrations characterized in that a hydrophonic system has been formed which subtracts seismic vibrations by adding in phase opposition the signal from one or more seismic sensors thereby canceling the vibrations of the seismic background noise radiated by 1 environment from the output signal. 2. Method according to claim 1 characterized in that 1 have one or more seismic detectors in an enclosure, box or any means of enveloping so that they are actuated by the accelerating forces due to the seismic vibratory background noise but that it is protected from hydrophonic signals. 3. procédé de détection de chute dans un volume d eau par analyse de signaux hydrophonique suivant revendication 1 et 2.3. method for detecting a fall in a volume of water by analysis of hydrophonic signals according to claim 1 and 2. 4. procédé de détection de chute dans un volume d eau suivant revendication 1, 2 et 3 dans lequel le système est intégré dans un projecteur de lumière immergé.4. method for detecting a fall in a volume of water according to claim 1, 2 and 3 in which the system is integrated into a submerged light projector. 5. procédé de détection de chute dans un volume d eau suivant revendication 1 2 et 3 dans lequel le système est intégré dans la structure du volume de dXn, ,coffrage ,béton ,mazez 5. method for detecting a fall in a volume of water according to claim 1 2 and 3 in which the system is integrated into the structure of the volume of dXn,, formwork, concrete, oil
FR9715254A 1997-11-28 1997-11-28 Underwater noise surveillance system Pending FR2771887A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9715254A FR2771887A1 (en) 1997-11-28 1997-11-28 Underwater noise surveillance system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9715254A FR2771887A1 (en) 1997-11-28 1997-11-28 Underwater noise surveillance system

Publications (1)

Publication Number Publication Date
FR2771887A1 true FR2771887A1 (en) 1999-06-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
FR (1) FR2771887A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005101343A1 (en) * 2004-04-07 2005-10-27 M.G. International Device for detecting a fall into a swimming pool
FR2878058A1 (en) * 2004-11-15 2006-05-19 Internat Pool Safety And Light Body fall detector for use in swimming pool, has acoustic pressure sensor immersed in water in swimming pool to receive noise propagating in water
WO2007060378A1 (en) * 2005-11-23 2007-05-31 Osl Group Holdings Limited Pool alarm
GB2502982A (en) * 2012-06-12 2013-12-18 Jeremy Ross Nedwell Swimming pool entry alarm and swimmer inactivity alarm
CN110058308A (en) * 2018-07-09 2019-07-26 南方科技大学 A kind of method, system and the terminal device of intertidal zone seismic prospecting

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005101343A1 (en) * 2004-04-07 2005-10-27 M.G. International Device for detecting a fall into a swimming pool
FR2878058A1 (en) * 2004-11-15 2006-05-19 Internat Pool Safety And Light Body fall detector for use in swimming pool, has acoustic pressure sensor immersed in water in swimming pool to receive noise propagating in water
WO2007060378A1 (en) * 2005-11-23 2007-05-31 Osl Group Holdings Limited Pool alarm
GB2502982A (en) * 2012-06-12 2013-12-18 Jeremy Ross Nedwell Swimming pool entry alarm and swimmer inactivity alarm
CN110058308A (en) * 2018-07-09 2019-07-26 南方科技大学 A kind of method, system and the terminal device of intertidal zone seismic prospecting
CN110058308B (en) * 2018-07-09 2020-11-06 南方科技大学 Intertidal zone seismic exploration method and system and terminal equipment

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