WO1989011636A1 - Ameliorations apportees a des dispositifs a actionnement electromagnetique - Google Patents

Ameliorations apportees a des dispositifs a actionnement electromagnetique Download PDF

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Publication number
WO1989011636A1
WO1989011636A1 PCT/GB1989/000571 GB8900571W WO8911636A1 WO 1989011636 A1 WO1989011636 A1 WO 1989011636A1 GB 8900571 W GB8900571 W GB 8900571W WO 8911636 A1 WO8911636 A1 WO 8911636A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic
arrangement
electro
magnetic field
magnetic portion
Prior art date
Application number
PCT/GB1989/000571
Other languages
English (en)
Inventor
Haqi Ismail Hussain Almossawi
Original Assignee
Geosensor Limited
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
Priority claimed from GB888812313A external-priority patent/GB8812313D0/en
Application filed by Geosensor Limited filed Critical Geosensor Limited
Publication of WO1989011636A1 publication Critical patent/WO1989011636A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
    • G01H11/02—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by magnetic means, e.g. reluctance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
    • G01H3/10—Amplitude; Power
    • G01H3/12—Amplitude; Power by electric means

Definitions

  • This invention relates to e I ectro-magnet ica I I y operable devices and to a method of operating electro ⁇ magnet ica My operable devices.
  • an e I ectro-magnet ica I I y operable arrangement includes a movable magnet ic port ion arranged, i n use, to be suspended, e.g. by dynamic-magnetic field, the electro ⁇ magnetic field and movement of the suspended magnetic portion being arranged to be driven by the dynamic or static force of energy.
  • the magnetic portion may be arranged to move in three dimensions and as a function of the time.
  • an eI ectro-magnet ica I I y operable arrangement includes a movable magnetic portion arranged, in use, to be located inside an electro-magnetic field, the magnetic portion being arranged to move in three dimensions, the e i ectro-magnet i c f ield and movement of the magnet ic portion being arranged to be driven by electro-magnetic force of energy.
  • the magnetic portion may be arranged to be suspended by the dynamic-magnetic field.
  • the movement of the magnetic portion may be arranged to change the electro-magnet ic ield. Alternatively or additional ly a change in the electro ⁇ magnetic field may be arranged to cause movement of the magnetic portion.
  • the arrangement may Include an indicator, which indicator may be arranged to provide an indication of a change in the electro-magnetic field.
  • the indicator may comprise an electronic signal input and/or output means.
  • the magnetic portion may be arranged to move in relation to the electro-magnetic field in response to the acoustic waves, environmental gravity and magnetic fields, or the multi-phases input electronic signals incident upon the arrangement.
  • the electro-magne ic field may be provided by a plural ity of electrical coi ls each of a different orientation and along axes of crysta I ograph i c system geometry.
  • the magnetic portion may comprise a sample of ferro-magnet Ic material which may be arranged to be suspended by the dynamic-magnetic field.
  • the ferro-magnet ic material may be arranged to experience both magneto-static and magneto-dynamic Ievi tat ion .
  • a method of operating an electro-magnetic arrangement including a magnetic portion comprises suspending the magnetic portion, e.g. by dynamic- magnetic field, and the movement of the magnetic portion inside the electro-magnetic field is due to the dynamic or static force of energy.
  • the method may include the magnetic portion being arranged to move in three dimensions and as a function of the t ime.
  • a method of operating an electro-magnetic arrangement including a magnetic portion comprises locating the magnetic portion inside the electro-magnetic field and al lowing the magnetic portion to move in three dimensions and the movement of the magnetic portion inside the electro-magnetic field is due to be the input mu I t i -phase and directions of electronic signals.
  • the method may include the magnetic portion being arranged to be suspended, e.g. by dynamic-magnetic field. Movement of the magnetic portion may be arranged to change the surrounded electro-magnetic field.
  • the method may provide that a change in the electro-magnetic field is arranged to cause movement of the magnetic portion.
  • the method may comprise interpreting signals from an indicator means, which signals may be indicative of the type, power, phase of the output, and acceleration, velocity, direction of acoustic waves, or environmental gravity and magnetic fields.
  • a method of detecting or monitoring dynamic and static fields of energy comprises means to provide an electro-magnetic field, suspended magnetic material capable of being Influenced by that field and an indicator means characterised in that, when incident upon the device, magnetic and gravity fields or mechanical vibrations In materials cause the suspended magnetic material to move in 3D relation to the electro-magnetic field of the detector, which movement is arranged to provide an indication in the Indicator means.
  • the indicator means may comprise an electronic signal output means in which the electronic signals are able to be indicative _of the type of energy field, the acoustic velocity, acceleration, frequency spectra, or direction of waves.
  • the plane wave front assumption need not be made since the device Is capable of detect ing mult i ⁇ directional energy fields, spherical and/or plane waves and distinguis ing therebetween.
  • a device for transmitting audible stereo sounds comprises means ' to provide an electro-magne ic field, ferro-magnetjc material , dynamic magnets, and magnetic core capable of being influenced by the electro-magnetic field of the device, and an indicator means characterised in that, when the electronic signals are incident upon the device, they cause the suspended magnetic material and vibrating plates or fibres to move and vibrate in relation to the electro-magnetic field of the device, " which movement Is arranged to provide an indication in the Indicator means and transforms the electronic signals into stereo sounds.
  • the indicator means may comprise an electronic signal input means in w ich the audible stereo sounds are able to be Indicative of the type, power, phase, and directions of the output audible sounds.
  • the means to provide the electro-magnetic field of the device may comprise one or more electrical coi ls.
  • the device may comprise a plural ity of mu I t i -d i rect iona I electrical c ⁇ i Is.
  • the sample of magnetic material capable of being influenced by the electro-magnetic field of the device, may be a sample of ferro-magnet I c material , for example ferrite, which is capable of being suspended in the dynamic-magnetic field of the device.
  • the means to provide the dynamic-magnetic field of the sound transmitter may comprise one or more electrical coi ls and ferro-magnet ic core.
  • the device may comprise a pl ura l i ty of mu lt i-d i rect iona l electr ical coi ls.
  • the sample of magnetic material capable of being influenced by the electro-magnetic field of the audible sound transmitter, may be a sample of ferro ⁇ magnetic material, which is capable of being suspended inside the dynamic-magnetic f ield of the device.
  • the audible sound transmitter may comprise vibrating plates, the centre of which may form a cy i inder around the ferro-magnet i c core which may be surrounded by electrical co i Is.
  • the signal output means may include means to fi lter the noise from the desired signals.
  • the signal output means may include means to increase the signal to noise ratio.
  • the signal output means may include means to produce a digital and/or analogue mode of the output.
  • the mode output produced by the sound output means may be arranged to be audible stereo sound.
  • the audible sound output means may include means to f i Iter the noise and infrasound from the desired signals.
  • the sound output means may Include means to increase the signal to noise ratio.
  • the audible sound output means may include means to regulate the b lance between the feedback current and the electronic signals that induce the audible stereo sound .
  • the sample of suspended magnetic material may experience or exhibit spherical or crysta Iograph ic system geometry.
  • the sample of magnetic material may experience magneto-dynamic levitation in the field of the device.
  • the signal input/output means may be capable of control l ing the magneto-dynamic levitation.
  • the dynamic magnets may be arranged along the axes of crystalograp Ic system geometry.
  • the sample of magnetic material may experience magneto-static levitation.
  • the magneto-static levitation may be effected by mu 11 i - i rect ionaI magnets.
  • a cool ing agent may be used to obtain a stable suspension inside
  • the sample of magnetic material may experience both magneto-static and magneto-dynamic levitation.
  • the sample magnetic material may be surrounded by a fluid other than air. Alternatively or additional ly the sample of magnetic material may be suspended by a plural ity of separate fibres.
  • the sample of magnetic material may be suspended in a vaccum.
  • the body of the vessel may include a window through which the suspended magnetic material may be viewed.
  • the means to provide the dynamic-magnetic field may comprise at least one ferro-magnet ic ring in which the inner face is at least partial ly covered by electrical coi ls of different orientations.
  • the means to provide the electro-magnetic field may comprise at lease one ferro-magnet fc ring In which the outer face is at least partial ly covered by electrical coi ls of different or i entat 1 ons .
  • the means to provide the electro-magnetic field may comprise dynamic magnets and electrical coi ls.
  • the dynamic magnets may be provided in numbers of six, nine or multiples and may be arranged along the axes of spherical , cyl indrical , or crysta I ograph i c system geometry.
  • the device may be operated by conventional methods, remote control or radio telemetry system.
  • a method of detecting or monitoring the dynamic and static magnetic fields of energy comprises providing an electro-magnetic field of the device and suspended magnetic material capa le of being influenced by that field, and detecting or monitoring movement of magnetic material inside the electro-magnetic field and providing an indication of that movement.
  • the method by which the electro-magnetic f ield of the device Is provided comprises using one or more electrical coi ls and along the axes of crysta Iograph ic system geometry.
  • a method of transmitting audible stereo sound comprises providing a magnetic unit composed of suspended magnetic portion, dynamic magnet, ferro-magnet i c core surrounded by cyl indrical electr ical coi ls, and from which a vibrating plate may form a cone and may supported by legs at the edges.
  • the magnetic units are arranged along the axes of crysta 1ograph ic system geometry, and two system geometries may be needed to produce the audible stereo sounds.
  • a method of transmitting audible stereo sound comprises providing electro-magnetic fields of the device, a suspended magnetic material capable of being Influenced by that field, magnetic core attached to, or part of, a dynamic magnet, vibrating plate, electronic circuitry, and monitoring movement of vibration of said suspended magnetic material and said vibrating plate or fibres in the dynamic-magnetic field of the device and providing an Indication of that audible stereo sound.
  • the device may be contained in a prefered shape of an elastic vessel .
  • the components of the device may have low sound absorption and/or reflection coefficients.
  • piezoelectric elements may be used to transform very high frequencies of mechanical vibrations Into voltages.
  • the piezoelectric elements may be embedded in sol id state circuitry.
  • Piezoelectric elements may be used to transform electronic signals Into very high frequencies of audible sound. Alternati ely, the p iezo-eIectr Ic elements may not be embedded in sol id state circuitry.
  • the method of monitoring movements of the sample of suspended magnetic material in the e I ectro-magnet Ic field may comprise monitoring electronic signals in one or more electrical coi ls and along the axes of crysto I graph i c system geometry.
  • Figure 1 shows a schemat ic s ide view of a detector
  • Figure 2 shows a schematic front view of the detector of F i gure 1 ;
  • Figure 3 shows a schematic plan view of the detector shown in Figures 1 and 2;
  • Figure 4 shows a schematic side view of an alternative embodiment of electro-magnetic units such as may be used in the detector shown in Figure 1 , 2, and 3, or the alternative crysta Iograph ic system design;
  • F igure 5 shows the frequency response of vibration of the detector
  • Figure 6 shows the field appl ications of the detector shown in Figures 1 to 3 or 4, and
  • Figure 7 shows a schematic side view of an alternative embodiment of an audible stereo sound transmission device.
  • Figures 1 to 3 show the detector such as might be used to detect mu l t i ⁇ directional , spherical and/or plane acoustic waves as wel l as the magnetic and gravity fields.
  • the vessel is placed on or in the ground, and for example the acoustic waves incident upon the vessel cause the " suspended magnetic material 10 to move within the magnetic field produced by the electro-magnetic field element 11.
  • the electro-magnetic field elements consists of ferro ⁇ magnetic r ings 11 , in which the inner and/or outer faces are covered by mu I t I -d i rect iona I electrical coi I s 12.
  • the electro ⁇ magnetic field elements may consist of dynamic magnets 41 and electrical coi ls 43, as shown in figure 4.
  • the eiectro-magnet ic field elements of the device consist of six, nine, or multiple elements, and are arranged along the axes of crysta lograph ic system geometry.
  • the crystalograp ic system geometry may form the shape of the detector or transmitter, and to suit the requ i red app I icat ion.
  • the suspended magnetic material 10 is located along the centre of the electro-magnetic (EM) field, and can be seen through a window.
  • the control unit 13 is connected to the terminals of each of the electrical coi ls.
  • a powered current source (internal 14 or external 15) maintains the magneto-dynamic levitation of the ' magnetic material 10 in conjunction with the feedback circuit 16.
  • the feedback circuit 16 regulates the balance between the feedback current source and the week signals induced from the mechanical vibrations and the magnetic/gravity fields, as wel l as separating the feedback signals and other sources of noise (thermal noise, noise due to co i I resistance, and Brownian particle motion In the gas within the vessel , etc.) from the induced signals.
  • the feedback circuit 16 also increases the induced signal to noise ratio and provides the digital and/or analogue mode of the output.
  • the feedback circuit 16 regulates the balance between the feed-back current and the Induced audible stereo sound, and separates the audible sounds from other sources of noise and infrasound.
  • the mu I t i -d i rect ions magnetic and/or gravity fields affect the suspended magnetic material 10 inside the electro-magnetic field of the device. These mechanical vibrations and changes in the environmental magnetic and gravity fields perturb the position of the magnetic material 10.
  • the magnetic material 10 is caused by the dynamic-magnetic field of the detector to return to its unperturbed position inside the vessel of the detector. Therefore, the movements of the magnet ic material 10 within the mu 11 i -d i rect iona I electrical coi ls generate voltages across the electrical coi ls.
  • the output of electrical voltages are proportional to, for the acoustic energy, the differences between the direction and velocity of the magnetic material 10 relative to the co i I s 12 and/or 43.
  • the output voltage is proportional to the velocity of the acoustic wave motion and relatively insensitive to the frequency.
  • the output for constant velocity of magnet 10 motion, is proportional to frequency and hence to the acceleration involved in the incident acoustic wave. It therefore can be seen that the acoustic wave detector as described herein transforms the multi ⁇ directional spherical and/or plane waves of mechanical vibrations into electr ical vol tages which are proportional to the relative and absolute velocity, acceleration, frequency spectra, and directions of vibrat ions.
  • Figure 5 shows the frequency response of the device,- a flat spectra 51 and 52 may be required over the relative frequency bandwidth of interest.
  • the required absolute frequency bandwidth, output power, and type of energy are functions of the physical and electro-magnetic character ist ics of the dynamic magnets, electrical coi ls and circuitry, and the magnetic mater la I 10.
  • the multi-phases and directions of input electronic signals to the audible sound transmitter cause the magnetic material 10 and the vibrating plates 73 to vibrate.
  • the Input electronic signals perturb the position of the magnetic material which is caused by the dynamic-magnetic field of the transmitter to return to its unperturbed position inside the vessel of the transmitter.
  • the movements or vibrations of the magnetic material 10 produce the low frequencies of audible sounds spectra.
  • the movement or vibrations of the vibrating plates 73 produce the higher frequencies of the audible sounds spectra.
  • the piezoelectric elements transform the electronic signals into very high frequencies of the audible sounds spectra.
  • the physical characteristics of the magnetic material 10, vibrating plates 73, and the piezoelectr ic elements determines the aud ible output power .
  • Stabi l ity is requ i red over the output frequency bandwidth.
  • the required fi ltering is of the noise (due to thermal , coi l resistance, Brownian particle motion, etc. ) and other external effects.
  • Envi ronmental integr ity requirements are that the detector should be resistant to dust, humidity, water and there should be low sensitivity to unwanted environmental and temperature effects.
  • the detector can be used to give information about sub ⁇ surface conditions by monitoring natural ground movements such as earthquakes, by monitoring explosives, or by monitoring magnetic and gravity fields induced by sub ⁇ surface ore bodies.
  • Figure 6 shows the field app I ications of the acoustic, magnetic, and gravity field detector.
  • the first layer 62 has low density and the second layer 61 has a higher density.
  • the purpose of this survey is to find the physical characteristics of layers 61 and 62, and the characteristics of the ore body 68.
  • the operator may plant the detector 65 on the ground surface 63 or Inside the wel l 59, carried out by a rig 69, and along the required surveying l ines.
  • the output may be sent through cables or radio telemetry system to the recording Instruments 70 i n . s i tu or at the data processing stat ion .
  • the gravitational acceleration (g) which is the force (f) per unit mass (ml ) of the ore body 68, perturbs the position of the suspended magnetic material 10 inside the detector 65 which has the known mass (m2).
  • the magnetic material 10 is caused by the dynamic-magnetic field of the detector 65 to return to Its unperturbed position.
  • the movement of the magnetic material 10 within the mu I t i -d i rect lona i electrical coi ls generate voltages across the electrical co i Is 12 and/or 43.
  • the output electrical voltages are a function of the time, and proportional to the absolute value of the gravitational acceleration (g), velocity, and directions of vibrations.
  • M / H ( d.d / L.L ) 1 ,5 tan & 2
  • M the magnetic moment caused by the dynamic- magnetic field of the detector 65 to return the magnetic material 10 to its unperturbed position
  • H the magnetic f ield strength of the ore body 68
  • d the distance between the centre of the magnetic material 10 and the centre of the ore body 68
  • 2L the length of the magnet ore body 68 between its poles
  • ⁇ is the angle of deflection of the magnetic material 10.
  • the magnetic force of the ore body 68 perturbs the position of the suspended magnetic material 10 inside the detector 65.
  • the magnetic material 10 caused by the dynamic- magnetic field of the detector 65 to return to its unperturbed position.
  • the movement of the magnetic material 10 within the mu 11 i -d i rect iona I electrical coi ls generate voltages across the electrical co i Is 12 and/or 43.
  • the output electrical voltage is a function of the time, and proportional to the absolute value of the magnetic field strength of the ore body 68 and the angle ( ⁇ ) of deflection of the magnetic material 10. Therefore, from equat ion 2 and s imi lar formu l as we cou ld characterise the location and physical characteristics of the ore body 68.
  • a source of energy 64 as in figure 6, e.g. controlable explosives.
  • the magnetic material 10 has to be In the unperturbed position inside the detector 65 in situ.
  • T is means that the operator should encounter the effects of the magnetic and gravity fields of the sub-surface In situ and before the start of countering the acoustic effects received from the energy source 64.
  • the mechanical vibrations of the sub-surface particles radiate spherical ly away from the energy source 64, and in form of stress 67 and strain 66 l ines. These vibrations vibrate the vessel of the detector 65 in situ, and perturb the position of the magnetic material 10 inside the vessel of the detector.
  • the magnetic material 10 is caused by the dynamic-magnetic field of the detector 65 to return to Its unperturbed position.
  • the movement of the magnetic material 10 within the multi ⁇ directional electrical coi ls generate voltages across the electrical col ls 12 and/or 43.
  • the output electrical voltage is a function of the time, and proportional to the absolute value of the acceleration, velocity, and di rect ions of the acoust ic vibrat ions.
  • the detector 65 could also detect the absolute values and characteristics of the sub-surface by countering the spherical effects of the acoustic energy, and providing the absolute values of velocity, acceleration, and directions of acoustic vibrations as a function of time.
  • a new theoretical development may be needed to support this invented detector, to process and interpret the received data, and to give a better resolution and picture of the material through which the acoustic energy has been conducted.
  • the electro-magnetic field elements may consist of electro-dynamic magnet 41 , magnetic core 75, electrical coi ls 43 and 71 , suspended magnetic material 10, and vibrating plate or fibres 73.
  • the vibrating plate 73 has a convex shape, and consists of two layers. The centre of the plate forms a cy I i nder around the magnetic core 75 which is surrounded by electrical coi ls 71.
  • the plate 73 has external terminals which are supported by legs 72 or cyl inder.
  • the output audible sound corresponding to input electronic signals in mu I t i -d i rect ions and phases, i .e.
  • each of the axes X Y Z may be translated as output at the vi ' bra.ting plate 73 and magnetic material 10.
  • the input electronic signals may be transmitted through a radio telemetry system.
  • the magnetic material 10 and the vibrating plate 73 move or vibrate wi th in the electro-magnet ic f i eld of the transmitter produced by the elements 41 and 75.
  • the magnetic material 10 transform the mu I t i -phases and direction of the input electronic signal into lower frequencies of the audible stereo sound.
  • the vibrating plate 73 transform the multi-phases and directions of electronic signals into higher frequencies of the audible stereo sounds.
  • One or two of the transmitter unit may be needed.
  • Each of the transmitters consists of four, six, eight, or multiples of the electro-magnetic units.
  • the electro-magnetic unit may be arranged along the axes of sphere or crystalograp ic system geometry, from which the external shape of the transmitter may be conducted.
  • the external case may be provided by a dust fi lter 74 to protect the sound transmitter.
  • the sound transmitter as shown in figure 7 Is arranged to transmit the audible stereo sound of the spectra 20 Hz to 20 KHz.
  • the sound transmitter may be arranged as shown in figure 4, to transmit audible stereo sound of lower audible frequency spectra, may be arranged as stereo headphone, and along axes of crystalograph ic system geometry.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

Un échantillon ferromagnétique (10) est suspendu à l'intérieur et au moyen d'un champ électromagnétique et se déplace à l'intérieur des éléments (11 et 12 et/ou 41 et 43) du champ électromagnétique grâce à la force d'entraînement dynamique/statique et/ou électromagnétique de l'énergie arrivant sur l'appareil. Le mouvement du matériau magnétique (10) est destiné à faire varier le champ électromagnétique ou vice versa. Une unité de commande (13), connectée aux bornes de chacun des enroulements électriques, permet aux signaux d'entrée et/ou de sortie de fournir une indication sur le type, la puissance, la phase et la direction du champ d'énergie induit.
PCT/GB1989/000571 1988-05-25 1989-05-23 Ameliorations apportees a des dispositifs a actionnement electromagnetique WO1989011636A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB888812313A GB8812313D0 (en) 1988-05-25 1988-05-25 Geophone
GB8812313.8 1988-05-25
GB8829294.1 1988-12-15
GB888829294A GB8829294D0 (en) 1988-05-25 1988-12-15 Almossawi's geophone

Publications (1)

Publication Number Publication Date
WO1989011636A1 true WO1989011636A1 (fr) 1989-11-30

Family

ID=26293928

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1989/000571 WO1989011636A1 (fr) 1988-05-25 1989-05-23 Ameliorations apportees a des dispositifs a actionnement electromagnetique

Country Status (2)

Country Link
AU (1) AU3731689A (fr)
WO (1) WO1989011636A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021206798A1 (fr) * 2020-04-09 2021-10-14 Raytheon Bbn Technologies Corp. Capteur de vecteurs acoustiques

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB923299A (en) * 1960-07-20 1963-04-10 Bendix Corp Transducer
US4458536A (en) * 1982-07-06 1984-07-10 The Charles Stark Draper Laboratory, Inc. Multiaxial vibration sensor
CH651663A5 (en) * 1981-02-03 1985-09-30 Prvni Brnenska Strojirna Electromagnetically acting induction-type transmitter for sensing vibrations

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB923299A (en) * 1960-07-20 1963-04-10 Bendix Corp Transducer
CH651663A5 (en) * 1981-02-03 1985-09-30 Prvni Brnenska Strojirna Electromagnetically acting induction-type transmitter for sensing vibrations
US4458536A (en) * 1982-07-06 1984-07-10 The Charles Stark Draper Laboratory, Inc. Multiaxial vibration sensor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021206798A1 (fr) * 2020-04-09 2021-10-14 Raytheon Bbn Technologies Corp. Capteur de vecteurs acoustiques
US11435428B2 (en) 2020-04-09 2022-09-06 Raytheon Bbn Technologies Corp. Acoustic vector sensor
AU2021254019B2 (en) * 2020-04-09 2023-03-09 Raytheon Bbn Technologies Corp. Acoustic vector sensor
JP2023510646A (ja) * 2020-04-09 2023-03-14 レイセオン ビービーエヌ テクノロジーズ コープ 音響ベクトルセンサ
US11698433B2 (en) 2020-04-09 2023-07-11 Raytheon Bbn Technologies Corp. Acoustic vector sensor

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