Acquisition device, preferably seismic, and corresponding manufacturing process

Abstract

The invention relates to a seismic preference acquisition device (1) comprising a housing (10) and a sensor system (11) coupled to the bottom wall (111) of the housing. A sound insulation device (2) is located inside the housing (10). This sound insulation device comprises a foam panel (21), a membrane (22) applied to one face of the foam panel (21), and a resonator array. A corresponding manufacturing method is also proposed. Figure for the abstract: Fig. 3

Description

Title of the invention: Acquisition device, preferably seismic, and corresponding manufacturing method. FIELD OF THE INVENTION

[0001] The present invention relates generally to vibro-acoustic wave acquisition devices, particularly for seismic applications, especially for use in geoscience or geophysical exploration. PRIOR ART

[0002] The acquisition and processing of seismic data generate a profile (image) of a geophysical structure beneath the ground surface, known as the subsurface, for example, for natural resource exploration. In particular, although this profile does not provide a precise location of oil and gas reservoirs, it suggests, to those trained in the field, the presence or absence of such reservoirs. Thus, providing a high-resolution image of the subsurface is important, for example, for those who need to determine the location of oil and gas reservoirs.

[0003] Reflection seismology is a geophysical exploration method that relies on the use of a controlled energy source that sends energy into the ground. By measuring the time it takes for reflections to return to several receivers, it is possible to assess the depth of the ground features causing these reflections. These features may be associated with underground hydrocarbon deposits or other subsurface configurations, such as cavities forming under railway lines.

[0004] A seismic acquisition system for recording the reflections of seismic waves, caused by geological structures present in the subsoil, uses seismic acquisition devices, also called seismic nodes.

[0005] It is of course desirable that the seismic acquisition device should have a limited size (bulk) and weight, especially since some study campaigns use several thousand devices in hard-to-reach places.

[0006] An autonomous seismic node is described, for example, in the application WO2021 / 048629. Although this seismic node provides reliable results, it appears that the external environment generates vibration and acoustic disturbances towards the enclosure, i.e., noise. Some of these disturbances have a frequency within, or close to, the frequency band useful for the source data, for example, frequencies below 400 Hz.

[0007] The problem of disturbance from external noise, as well as the need for a small size and limited weight, also arise for a wave acquisition device in the context of applications other than seismic, for example for monitoring the condition of an infrastructure such as a bridge.

[0008] The present invention aims to provide a new wave acquisition device, preferably for seismic waves, and a corresponding manufacturing process that addresses at least partially one or more of the problems described above. Summary of the invention

[0009] For this purpose, the invention relates to a wave signal acquisition device, preferably a seismic acquisition device, comprising: - a housing; - a wave sensor system, preferably a seismic sensor system, housed inside the casing and coupled to the bottom wall of the casing; characterized in that the wave signal acquisition device includes a sound insulation device, the sound insulation device being disposed inside the housing, and comprising: - a foam panel with an outer face oriented towards the outside of the housing and an inner face oriented towards the center of the housing, - a membrane applied to one face of the foam panel, preferably the face of the foam panel oriented towards the center of the housing, - tubular resonators that extend through the foam between the faces of the foam.

[0010] Such a design of the acquisition device makes it possible to filter the mechanical, or vibro-acoustic, waves of a noisy external environment which propagate through the peripheral wall of the housing, so as to remove or attenuate the acoustic disturbances, and to be able to acquire the signal transmitted by the ground without interference in the frequency band of interest of the vibratory waves acquired by the sensor system.

[0011] Thus, the acquisition by the sensor system of the frequencies of interest in the intended application, in particular the frequencies below 400 Hz, preferably below 150 Hz, of seismic waves, is not disturbed by external noise whose frequency band corresponding to the frequency band of interest of the signals acquired by the sensor system has been filtered by the acquisition device.

[0012] The preferred embodiment in which the acoustic insulation device is added inside the housing of the acquisition device further allows the housing to retain sufficient strength (hardness) to transmit vibrations from the ground to the sensor system, and allows the acquisition device to be sufficiently robust to withstand environmental stresses, both due to their long-term use outdoors imposes specific conditions for implementation.

[0013] The device may also include one or more of the following features taken in any technically permissible combination.

[0014] According to one embodiment, the housing comprising a bottom wall and a top wall, connected to each other by a peripheral wall, the acoustic insulation device is arranged opposite the peripheral wall of the housing, while being away from said peripheral wall.

[0015] According to one embodiment, the foam is porous.

[0016] According to one embodiment, the sound insulation device comprises a additional membrane applied to another side of the foam panel.

[0017] According to one embodiment, said or each membrane is made of polymer material, preferably of the polyvinylidene type.

[0018] According to one embodiment, the tubular resonators are arranged at regular intervals from each other.

[0019] According to one embodiment, the tubular resonators are arranged parallel to each other.

[0020] According to one embodiment, each tubular resonator has a longitudinal slot, which preferably extends over the entire length of the tubular resonator.

[0021] According to one embodiment, each tubular resonator is arranged so that the longitudinal slot of the tubular resonator is open towards the face of the foam panel which is oriented towards the center of the housing.

[0022] According to one embodiment, each tubular resonator includes an orifice diametrically opposite the longitudinal slot.

[0023] According to one embodiment, each tubular resonator has a Young's modulus which is greater than or equal to 6000 MPa, and preferably less than or equal to 12000 MPa, for a temperature of 20°C.

[0024] According to one embodiment, the height of the foam panel is less than the height of the case.

[0025] According to one embodiment, the foam panel is separated from the inner face of the bottom wall of the case.

[0026] According to one embodiment, the density of the foam panel is between 10 and 35 kg / m3.

[0027] According to one embodiment, the foam is a polyurethane foam or a melamine foam.

[0028] According to one embodiment, the housing comprises a double wall delimiting a space inside which the acoustic insulation device is positioned.

[0029] According to one embodiment, the housing comprises two half-shells assembled to each other, preferably without play between the two half-shells.

[0030] The invention also relates to a method for manufacturing a data acquisition device according to any one of the preceding embodiments, the method comprising the following steps: - application of a membrane to one side of a foam panel, the foam preferably being porous; - insertion of tubular resonators through the foam panel between the faces of the foam panel; - positioning of the foam panel equipped with the membrane and tubular resonators, inside a housing; - coupling of the sensor system to the bottom wall of the housing. Brief description of the drawings

[0031] Other features and advantages of the invention will become apparent from the following description, which is purely illustrative and not limiting and should be read in conjunction with the accompanying drawings, on which:

[0032] - [Fig. 1] [Fig. 1] is a perspective view of part of a device seismic acquisition according to an embodiment of the invention, the housing of the device comprising two half-shells, one of the half-shells being removed to show the acoustic insulation device which extends inside and protrudes from the other half-shell, the acoustic insulation device having a foam through which tubular resonators pass, and in this example two membranes applied to the faces of the foam, the tubular resonators each having a longitudinal slot oriented towards the inside of the housing;

[0033] - [Fig.2] [Fig.2] is a perspective view of the acoustic insulation device of the [Fig.l];

[0034] - [Fig.3] the [Fig.3] a partial schematic and cross-sectional view of a device seismic acquisition according to another embodiment of the invention, showing the relative arrangement of the acoustic insulation device in the housing, in the case of a housing having a double wall, the acoustic insulation device having a foam through which tubular resonators pass, and a membrane applied to a face of the foam located on the side of the inside of the housing (i.e. oriented towards the center of the housing), each tubular resonator having a longitudinal slot oriented towards the inside of the housing;

[0035] - [Fig.4] [Fig.4] is a perspective view of a tubular resonator according to a viewing angle showing its longitudinal slit;

[0036] - [Fig.5] [Fig.5] is a detailed view of part of the resonator of [Fig.4];

[0037] - [Fig.6] [Fig.6] is a flowchart illustrating the steps of a process of manufacturing of an acoustic acquisition device according to an embodiment of the invention. DETAILED DESCRIPTION

[0038] Embodiments are described below with reference to the accompanying drawings. Similar numbers refer to similar features in all drawings. However, the invention can be implemented in many different forms and should not be construed as being limited to the embodiments shown here. The scope of the invention is defined by the accompanying claims.

[0039] A reference throughout the specification to "an embodiment" means that a particular feature, structure, or characteristic described in relation to an embodiment is included in at least one embodiment of the present invention. Thus, the appearance of the phrase "in an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0040] With reference to the figures, a seismic acquisition device 1 is shown. The description is also applicable to vibro-acoustic signal acquisition devices for applications other than seismic surveying, in particular for applications other than geophysical exploration. Vibro-acoustic signals may also be referred to as vibrational and / or acoustic signals, or wave signals, for the remainder of this description. Other applications may include the monitoring of infrastructure such as bridges by acquiring vibrational signals transmitted to the device by the structure, or any geophysical study.

[0041] The terms "lower" and "upper", as well as "below", "above" or other similar relative term, are defined by reference to the ground-positioned state of the housing with the bottom wall of the housing 10 in contact with the ground.

[0042] As detailed below, the seismic acquisition device 1 includes an acoustic isolation device adapted to filter the low frequencies of interest in the intended application, which in the following description is seismic.

[0043] The device 1 comprises a housing 10 including a bottom wall 111, and a top wall, connected to each other by a peripheral wall 109. The peripheral wall 109 has an outer face and an inner face.

[0044] According to a preferred embodiment and as illustrated in [Fig. 3], said peripheral wall is called the main peripheral wall 109 and the housing includes an additional inner peripheral wall 110 which extends inside the housing in being separated from the main peripheral wall. The enclosure thus comprises a double wall 109, 110 formed by the main peripheral wall and the additional peripheral wall, which delimit between them a space suitable for receiving a sound insulation device as proposed below. However, it is also possible for the enclosure to comprise a single peripheral wall 109.

[0045] Preferably, the housing 10 comprises two interlocking half-shells. The interlocking is advantageously achieved without play. The said peripheral wall thus has one part formed by one half-shell and the other part formed by the other half-shell.

[0046] A seismic sensor system 11 is housed inside the casing 100. The seismic sensor system may comprise one or more sensors, for example, a triaxial seismic sensor. The seismic sensor system is preferably a microelectromechanical system (MEMS).

[0047] The sensor system 11 is connected to a processing unit 12 which allows the acquired signals to be processed to generate seismic data which can be recorded in a memory housed in the casing and / or transmitted by radio link to a remote receiver, using a radio communication module of the processing unit 12.

[0048] At least the bottom wall 111 of the housing 10 has a rigidity suitable for transmitting waves from the ground to the sensor system. The housing is preferably made of polyurethane or polyamide plastic.

[0049] The housing, or seismic sensor system, used may be a housing, or seismic sensor system, of the type described in application WO2021 / 048629.

[0050] The seismic sensor system 11 is acoustically coupled to the bottom wall 111 of the housing, which is intended to be in contact with the ground subjected to the waves and / or vibrations whose corresponding signals are to be acquired. Acoustically coupled means that the seismic sensor system 11 is arranged with the bottom wall 111 of the housing such that an acoustic wave incident on the bottom wall is transmitted through the bottom wall 111 to the seismic sensor system 11. The seismic sensor system 11 can thus be in direct or indirect contact with the bottom wall.

[0051] Thus, when the bottom wall of the housing is in contact with the ground, the seismic acquisition device 1 allows the acquisition with the sensor system 11 of signals corresponding to vibration waves coming from the ground and transmitted by the bottom wall 111 to the sensor system 11.

[0052] In this preferred embodiment, the acoustic insulation device 2 is arranged inside the housing 10. Preferably, for seismic applications, the acoustic insulation device is capable of filtering low frequencies below 400 Hz. By absorbing or attenuating the low frequencies of the acoustic waves to which the peripheral wall is exposed, the acoustic insulation device 2 enables the sensor system 11 to acquire the signals corresponding to the waves transmitted through the ground via the bottom wall 111, without interference from the low frequencies of noise waves from the surrounding environment, which are distinct from the ground-transmitted waves useful for the seismic application.

[0053] Active foam

[0054] The acoustic insulation device 2 comprises a foam 21 in the form of a panel having two opposing faces, one referred to as the outer face facing the peripheral wall 109 of the housing and the other referred to as the inner face facing the interior of the housing. The acoustic insulation device 2 comprises at least a first membrane 22 applied to one of said faces of the foam, preferably the inner face of the foam, i.e., the face of the foam panel 21 facing the center of the housing.

[0055] The sound insulation device 2, in particular the foam panel, can be:

[0056] a single pre-formed piece, for example pre-folded, in three dimensions to follow the peripheral wall of the housing or be shaped during insertion into the housing,

[0057] or be formed of several separate portions, for example one portion per side of the peripheral wall of the housing, which can then be brought separately into the housing.

[0058] The foam can be a polyurethane foam or a melamine foam.

[0059] According to a particular aspect, the foam 21 is porous. The greater the porosity, the greater its impact on low-frequency waves.

[0060] The membrane 22 is flexible and thin (for example, a few tenths of a millimeter). The membrane 22 is advantageously made of a polymer material, preferably polyvinylidene (PVDF). Positioning the membrane 22 on one face of the foam 21 allows for control of the acoustic activation. The membrane 22 may have a density between 1600 and 2000 kg / m³. The membrane 22 may have a Young's modulus between 400 and 22,000 MPa at a temperature of 20°C (i.e., at room temperature).

[0061] An acoustic wave 9 from the peripheral environment of the housing which is incident on the peripheral wall of the housing passes through and deforms the foam 21 and the membrane 22 constrains the foam so as to cancel the reflection of the waves on the rear face of the foam.

[0062] According to a preferred embodiment, the acoustic insulation device 2 comprises a second membrane 23 applied to the outer face of the foam. The description of the characteristics of membrane 22 can also be applied to membrane 23.

[0063] The foam 21 equipped with the first membrane 22 and preferably the second membrane 23 thus forms an active foam. The operating principle of an active foam is known to those skilled in the art, who may, for example, refer to the publication entitled "Active foams: a solution for improving low-frequency sound absorption" by the authors: LEROY P., HERZOG P., BERRY A., ATALLA N.

[0064] According to one embodiment, the foam 21 has the following characteristics: - a density between 10 and 35 kg / m3; - a Young's modulus greater than 40 kPa at 20°C (i.e., room temperature); - a foam thickness of less than 10 mm, for example around 6 mm.

[0065] Arrangement of the sound insulation device in the housing

[0066] The acoustic insulation device 2 is positioned opposite the peripheral wall 109 of the housing 10, while being kept away from said peripheral wall, to leave an air gap between the peripheral wall 109 of the housing 10 and the acoustic insulation device 2. In the case of a double wall 109, 110, the acoustic insulation device 2 is placed in the space defined between the two walls, preferably at a distance from the two walls.

[0067] The height H2 of the foam can be between 15 and 45 mm depending on the frequency band to be filtered. The density of the foam can be between 10 and 35 kg / m³.

[0068] In the case of a housing formed of two half-shells, the acoustic insulation device 2 extends outward from one of the half-shells, as seen in [Fig.1], in the withdrawn state from the other half-shell.

[0069] At least the portion of the bottom wall 111 to which the sensor system is coupled is devoid of acoustic insulation.

[0070] According to a particular aspect, the outer face of the foam panel 21 of the acoustic insulation device 2 is positioned facing only the peripheral wall of the housing 10. Preferably, only the lower edge of the foam panel 21 is positioned facing but at a distance from the bottom wall 111. In other words, the useful portion of the bottom wall to which the sensor system 11 is coupled is not acoustically insulated in order to be able to acquire the signals corresponding to the waves coming from the ground and transmitted to the sensor system via the bottom wall 111 of the housing.

[0071] Conversely, acoustic waves originating from the external environment at the level of the peripheral wall are likely to disrupt the measurements in sound transmitted through the peripheral wall is filtered by the acoustic insulation device 2.

[0072] The height H2 of the foam 21 is less than the height of the housing 10. Preferably, the lower edge of the foam 21 is offset from the inner face of the bottom wall 111 of the housing. Similarly, the upper edge of the foam 21 can be offset from the inner face of the top wall of the housing.

[0073] It can be provided that the upper wall is acoustically insulated or not.

[0074] Tubular resonators

[0075] The acoustic insulation device 2 also includes resonators 3, which are tubular and extend through the foam 21 between opposite faces of the foam panel according to the preferred embodiment. The interior space delimited by each tubular resonator is filled with air.

[0076] The ends of each tubular resonator 3 preferably extend outward from the foam, in particular by protruding beyond the lower and upper edges of the foam. The tubular resonators 3 extend parallel to the faces of the foam (i.e., they do not pass through the faces, but enter and exit the foam through the upper and lower edges of the foam delimited between the two faces, preferably parallel to the faces, preferably orthogonally to the bottom wall (lower wall) of the housing intended to be in contact with the ground).

[0077] The tubular resonators 3 can be arranged at regular intervals from each other.

[0078] The tubular resonators 3 form a network of tubular resonators functioning as Helmholtz resonators. Thus, the device 2 comprises an active foam in which a tubular network is incorporated, with a periodicity between the different cavities formed by the tubular resonators 3 which is preferably constant.

[0079] According to a preferred embodiment, each tubular resonator 3 has a longitudinal slot 31, which preferably extends over the entire length of the tubular resonator 3. Advantageously, each resonator is oriented so that the longitudinal slot 31 of the tubular resonator 3 is open towards the inside 100 of the housing 10 in the housed state of the acoustic insulation device 2 in the housing.

[0080] According to one embodiment, each tubular resonator 3 includes an orifice 32 with a diameter of, for example, 0.5 to 2 times the size of the slot, diametrically opposite the longitudinal slot 31, preferably located in the lower part of the tubular resonator 3.

[0081] According to a particular aspect, each tubular resonator 3 has a Young's modulus which is greater than or equal to 6000 MPa, and preferably less than or equal to 12000 MPa, for a temperature of 20°C (i.e. at room temperature).

[0082] Preferably, the material of each tubular resonator 3 comprises a rigid polymer. The material may be PA6.6GF, preferably comprising 30 to 40% glass fibers. The density may be between 1200 and 1700 kg / m³.

[0083] The acoustic insulation device 2 thus forms a hybrid solution that combines an active foam, preferably porous and including at least one thin, flexible membrane, for example made of polyvinylidene fluoride (PVDF), with a network of tubular resonators functioning as Helmholtz resonators. This combination makes it possible to isolate the frequencies of acoustic waves originating from the noisy peripheral environment of the housing and corresponding to frequencies of interest from the waves transmitted through the bottom wall to the sensor system, while maintaining the robustness and resistance of the housing necessary for outdoor use and for the transmission of seismic vibrations through the bottom wall of the housing to the sensor system.

[0084] Processing unit

[0085] The processing unit 12 is presented for example in the form of a processor and a data memory in which computer instructions executable by said processor are stored, or in the form of a microcontroller.

[0086] In other words, the functions and steps described can be implemented in the form of a computer program or via hardware components (e.g., programmable gate arrays). In particular, the functions and steps performed by the processing unit, especially for processing the signals captured by the sensor system, can be carried out by instruction sets or computer modules implemented in a processor or controller, or by dedicated electronic components or components of the type of field-programmable gate array (FPGA) or application-specific integrated circuit (ASIC).It is also possible to combine computer and electronic components.

[0087] The processing unit is thus an electronic and / or computer unit. When it is specified that said unit is configured to perform a given operation, this means that the unit includes computer instructions and the corresponding means of execution which enable said operation to be carried out and / or that the unit includes corresponding electronic components.

[0088] Manufacturing process

[0089] The acquisition device 1 shown above can be manufactured according to a process of which an example is shown below in connection with [Fig.6].

[0090] The acoustic insulation device can be achieved by applying the first membrane 22 to one face of the foam panel 21, 610. Preferably, the second membrane 23 is applied to the other face. The tubular resonators 3 are inserted in step 620 into the foam panel between the faces, preferably by passing through the foam 21 so as to protrude from the lower and upper edges of the foam.

[0091] In step 630, the corresponding acoustic insulation device 2 can then be housed in the casing 10 opposite the peripheral wall 109 of the casing. The sensor system 11 can be coupled to the bottom wall 111 of the casing (step 640), before or after the preceding operations. The sensor system 11 can be part of an electronic board that includes the processing unit 12.

[0092] Advantageously, the foam panel 21 is manufactured by extruding and then cutting the foam panel 21. The foam panel can be obtained by expanding around the pre-positioned tubular resonators. Alternatively, the foam can be a pre-formed foam panel, preferably extruded, in which holes are drilled for the insertion of the tubes, or the tubes can be inserted directly through the foam.

[0093] The combination of active foam and the network of tubular resonators allows the acoustic insulation device to have a limited mass and size, enabling it to be integrated into the housing of an existing wave acquisition device, such as that described in application WO2021 / 048629, possibly with some minor modifications to the housing. The rigidity of the housing ensures good transmission of seismic waves useful for imaging a subsoil.

[0094] It can be noted that using foam alone to absorb waves at a frequency of 150 Hz would require a material thickness of 57 cm, which is incompatible with a seismic application where a typical enclosure is less than 30 cm. For a target frequency of 50 Hz, the required foam thickness would be 172 cm, which is also unsuitable for a seismic application.

[0095] By way of example, each tubular resonator may be expected to have the following characteristics: - resonator diameter = 3 mm - thickness = 0.1 mm - height = 50 mm - diameter of the drilling hole = 0.2 mm.

[0096] The acoustic insulation device can be assembled in the housing by nesting the acoustic insulation device within the housing, thus avoiding the use of glue. The assembly is therefore easier to disassemble and recycle.

[0097] Such a design of the acoustic isolation device makes it possible to isolate low frequencies (below 400 Hz) from external noise by vibrating the acoustic isolation device 2, and to maintain or even increase the rigidity of the housing in order to dissipate some of the noise through this acoustic isolation device. The remaining noise, with higher frequencies, is dissipated through the housing without causing significant interference with seismic waves from the ground because these higher frequencies are outside the seismic band of interest.

[0098] The invention is not limited to the embodiments illustrated in the drawings; the sound insulation device could thus be placed outside a sensor housing.

[0099] Furthermore, the term "including" does not exclude other elements or steps. In addition, features or steps that have been described with reference to one of the embodiments set forth above may also be used in combination with other features or steps from other embodiments set forth above.

Claims

Demands

1. Wave signal acquisition device (1), preferably a seismic acquisition device, comprising: - a housing (10); - a wave sensor system (11), preferably a seismic sensor system, housed inside (100) the housing (10) and coupled to the bottom wall (111) of the housing; characterized in that the wave signal acquisition device (1) comprises an acoustic insulation device (2), the acoustic insulation device (2) being disposed inside the housing (10), and comprising: - a foam (21) in the form of a panel having an outer face oriented towards the outside of the housing and an inner face oriented towards the center of the housing, - a membrane (22) applied to a face of the foam panel (21), preferably the face of the foam panel (21) oriented towards the center of the housing (10), - tubular resonators (3) which extend through the foam (21) between the faces of the foam (21).

2. Device (1) according to claim 1, wherein the housing (10) comprising a bottom wall (111), and a top wall, connected to each other by a peripheral wall (109), the sound insulation device (2) is disposed opposite the peripheral wall (109) of the housing (10), while being separated from said peripheral wall (109).

3. Device (1) according to any one of the preceding claims, wherein the foam (21) is porous.

4. Device (1) according to any one of the preceding claims, wherein the sound insulation device (2) comprises an additional membrane (23) applied to another face of the foam panel (21).

5. Device (1) according to any one of the preceding claims, wherein said or each membrane (22, 23) is made of polymer material, preferably of the polyvinylidene type.

6. Device (1) according to any one of the preceding claims, wherein the tubular resonators (3) are arranged at regular intervals from each other.

7. Device (1) according to any one of the preceding claims, wherein the tubular resonators (3) are arranged parallel to each other.

8. Device (1) according to any one of the preceding claims, wherein each tubular resonator (3) has a longitudinal slot (31), which preferably extends over the entire length of the tubular resonator (3).

9. Device (1) according to claim 8, wherein each tubular resonator (3) is arranged so that the longitudinal slot (31) of the tubular resonator (3) is open towards the face of the foam panel which is oriented towards the center of the housing (10).

10. Device (1) according to any one of claims 8 or 9, wherein each tubular resonator (3) comprises an orifice (32) diametrically opposite the longitudinal slot (31).

11. Device (1) according to any one of the preceding claims, wherein each tubular resonator (3) has a Young's modulus which is greater than or equal to 6000 MPa, and preferably less than or equal to 12000 MPa, for a temperature of 20°C.

12. Device (1) according to any one of the preceding claims, wherein the height of the foam panel (21) is less than the height (H2) of the housing (10).

13. Device (1) according to any one of the preceding claims, wherein the foam panel (21) is moved away from the inner face of the bottom wall (111) of the housing (10).

14. Device (1) according to any of the preceding claims, wherein the density of the foam panel (21) is between 10 and 35 kg / m3.

15. Device (1) according to any one of the preceding claims, wherein the foam (21) is a polyurethane foam or a melamine foam.

16. Device (1) according to any one of the preceding claims, in which the housing (10) comprises a double wall (109, 110) delimiting a space within which the sound insulation device (2) is positioned.

17. Device (1) according to any one of the preceding claims, wherein the housing (10) comprises two half-shells assembled to each other, preferably without play between the two half-shells.

18. A method for manufacturing an acquisition device (1) according to any one of the preceding claims, the method comprising the following steps: - application (610) of a membrane (22) onto one face of a foam panel (21), the foam preferably being porous; - insertion (620) of tubular resonators (3) through the foam panel (21) between the faces of the foam panel (21); - positioning (630) of the foam panel provided with the membrane (22) and the tubular resonators (3), inside a housing (10); - coupling (640) of the sensor system (11) to the bottom wall (111) of the housing.

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