SONAR DEVICE WITH HOLDER

Abstract

The present disclosure relates to a Sonar device (1) for detection of underwater objects. The sonar device (1) comprises a body element (2) comprising a piezo electric element (3). The sonar device further comprises a holder (4) adapted to hold the piezo electric element (3). The holder (4) is arranged to centre the piezo electric element (3) within said body element (2). The holder (4) is arranged such that the piezo electric element (3) is held firmly in place and also provide for that detection can be made omni-directionally. A method for manufacturing a holder (4) and a sonar device (1) is also disclosed.

Claims

1. Sonar device (1) for detection of underwater objects, comprising a body element (2), comprising a piezo electric element (3), characterized in that further comprised is a holder (4) for the piezo electric element (3), wherein the holder (4) is arranged such that it can centre and hold the piezo electric element (3) within said body element (2), wherein said holder (4) is arranged such that the piezo electric element (3) is held firmly in place with no intended damping effects.

2. Sonar device (1) according to claim 1, wherein the piezo electric element (3) has a half spherical shape or a full spherical shape.

3. Sonar device (1) according to claim 1, wherein further comprised is a resin (6) filling of the body element (2) in order to make the sonar device (1) water proof and further hold the piezo electric element (3) in position.

4. Sonar device (1) according to claim 1, wherein the holder (4) engages the piezo electric element (3) by means of a half spherical bowl shape.

5. Sonar device (1) according to claim 1, wherein the holder (4) engages the piezo electric element (3) at four to twelve separate engaging areas (400, 410, 420, 430), preferably at four separate areas.

6. Sonar device (1) according to claim 5, wherein the separate engaging areas (400, 410, 420, 430) are distributed in a symmetric pattern to the piezo electric element (3).

7. Sonar device (1) according to claim 1, wherein further the holder (4) has a cavity where the electronics (7) needed for the sonar device (1) is directly comprised within the structure of the holder (4).

8. Sonar device (1) according to claim 1, wherein at least the holder (4) is a layer on layer element as provided by manufacturing by a reciprocating three dimensional printing device (8).

9. Method of manufacturing a sonar device according to claim 1, comprising the steps of: s1. providing a reciprocating three dimensional printing device, s2. providing an input data to said reciprocating three dimensional printing device that gives instruction to print a holder for a piezo electric element, s3. positioning a piezo electric element in said holder, s4. providing a body element into which said holder comprising the piezo electric element is inserted.

10. Method according to claim 9, wherein further comprised is the step of: providing a resin and filling the body element with said resin and covering at the same time said holder and piezo electric element.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG. 1 discloses a sonar device according to the invention from the side.

[0032] FIG. 2 discloses the sonar device of FIG. 1 from above.

[0033] FIG. 3 discloses a sonar device with a cavity for electronics within the holder for the piezo electric element.

[0034] FIG. 4 discloses a reciprocating three dimensional printing device.

[0035] FIG. 5 discloses a piezo electric element and a holder according to a preferred disclosure.

[0036] FIG. 5a discloses a piezo electric element and a holder according to a preferred disclosure.

[0037] FIG. 5b discloses a piezo electric element and a holder according to a preferred disclosure.

[0038] FIG. 6 discloses a sonar device in a preferred disclosure.

[0039] FIG. 7 discloses the said sonar device from above with four holder arms.

[0040] FIG. 7a discloses the said sonar device from above with three holder arms.

[0041] FIG. 8 discloses the said sonar device from above with eight holder arms.

[0042] FIG. 9 discloses the said sonar device from above with twelve holder arms.

[0043] FIG. 10 is a flow chart for manufacturing a holder for a sonar device.

[0044] FIG. 11 is a flow chart of a method for manufacturing a sonar device.

DETAILED DESCRIPTION

[0045] The present disclosure relates to sonar devices 1 for detection of underwater objects according to FIG. 1-3.

[0046] The sonar device 1 for detection of underwater objects comprises a body element 2. The body element 2 is the element that forms the outer perimeter of the sonar device 1. As exemplified by FIG. 2 the body element is disclosed as having a circular cylinder shape. The cylinder shape is suitable for a sonar device as it is essentially uniform in a transversal plane as shown in FIG. 2. Even though the cylindrical shape is preferred, the shape of the sonar device can be spherical, or in other ways regular.

[0047] A central symmetry line 20 can be seen in FIG. 1 but is valuable for all figures when the sonar device 1 is symmetrical in at least a longitudinal direction.

[0048] The sonar device 1 comprises a piezo electric element 3. The shape of the piezo electric element 3 is preferably spherical, as shown in FIGS. 1, 3, 4 and 6-9. In FIGS. 1 and 3, the piezo electric element 3 is disclosed with a dashed line, as it is positioned inside the body element 2, and not visible in when the sonar device 1 is in operation. The piezo electric element 3 is preferred to be a hollow sphere.

[0049] The piezo electric element 3 is preferably made of a ferroelectrics material for example barium titanate or lead zirconate titanate or a piezo ceramic material. A spherical diameter 9 applies as the largest diameter of the piezo electric element 3.

[0050] The piezo electric element 3 is held by a holder 4. The holder 4 is according to the aspect of the disclosure not to provide any intended damping effect. The holder 4 is engaging the piezo electric element 3 at separate engaging areas. Thus it should be understood that small damping effects that are inevitable should be comprised within the present disclosure, however the intention is to achieve a holder without any general damping. The reason for this is that it is desired to be able to detect sound waves omni-directionally. If damping in one direction is occurring this direction can be excluded from detection/listening.

[0051] The holder 4 is positioned concentric with the body element 2 in the lower part of the body element 2. The piezo electric element 3 is positioned in the holder 4. The body element 2 is preferred to be filled with a resin 6 that also enclose the holder 4 and the piezo electric element 3.

[0052] An example of a holder 4 is disclosed in FIG. 3. This holder has a half spherical shape and provides a particularly good hold for the piezo electric element 3. Another preferred disclosure of the holder 4 is disclosed in FIGS. 5, 5a, 5b and 6. This exemplified holder 4 is made from three arms 40, 41, 42. These three arms are engaged with the piezo electric element 3 at three respective separate engagement areas (400, 410, 420). As can be seen in figure Sa the separate engagement areas have preferably a recess 10, thus the separate engagement areas have two points as exemplified by the separate engaging area 41 with points 410a and 410b, where the separate engaging area 41 engage the piezo electric element 3. This gives better sonic properties and increased stability. Preferably all exemplified holders have a recess 11 in the bottom structure. The recess 11 provides for sound waves propagating without interfering with the holder structure. The structure of the holder 4 very closely follows the piezo electric element 3, such that a particular firm hold is achieved. The disclosure is not limited to three arms. It is thinkable to have any number of arms. However it is of importance that the arms are distributed in a symmetric pattern around the piezo electric element 3 at least for stability reason. As an example FIGS. 7, 8, and 9 discloses a four to twelve arm configuration. The separate engaging areas (400, 410, 420, 430 . . . ) are distributed in a symmetric pattern to the piezo electric element (3), by a likewise number of symmetrical arms (40, 41, 42, 43 . . . ).

[0053] In a preferred aspect of the disclosure the holder 4 is a layer on layer element. As disclosed in FIG. 4 by using a reciprocating three dimensional printing device 8 for manufacture of the holder 4 it is possible to perfectly match the dimensions of the piezo electric element 3. It is also possible to perfectly match the body element 2 such that a very good hold of the piezo electric element 3 is achieved.

[0054] Further, the use of a layered on layer element as a holder 4 manufactured by a reciprocating three dimensional printing device 8 makes it is possible to incorporate within the holder structure itself the electronic equipment 7. This electronic equipment 7 is needed for the operation of the sonar device 1. Also wiring can be incorporated for the electronics. The electronic equipment 7 can be fully incorporated but it is also possible to have an opening to the surroundings for easy access form outside to the electronic equipment 7.

[0055] Preferably the sonar device as disclosed in FIGS. 1-3, is filled with a resin 6 after installation of the piezo electric element 3. The resin is preferably temperature resistant. The resin has preferably the ability to prevent water from entering the sonar device 1 and to thereby prevent damage the piezo electric element 3. The resin can for example be of urethane or nylon or other suitable resin.

[0056] The disclosure also relates to a manufacturing method of a holder 4 for a sonar device 1 of FIGS. 1-3 according to FIG. 10. The method uses at least for some steps of the manufacturing a three dimensional printing device 8. The manufacturing method comprises a step of: [0057] s1. providing a reciprocating three dimensional printing device

[0058] In this step s1 a suitable reciprocating three dimensional printing device 8 is provided. The device can be any device. However, the device must be suitable for providing a layer of for example resin that does not interfere with the piezo electric device 3.

[0059] The manufacturing method comprises further a step of [0060] s2. providing a data input to said reciprocating three dimensional printing device that gives instruction to print a holder for a piezo electric element,

[0061] In this step s2 the inner structure and inner dimensions with the outer dimensions of the holder 4 is set. This must of course be adapted to the chosen piezo electric element, its dimensions and the material of it. By altering the input data to the reciprocating three dimensional printing device the holder can be arranged such that it sufficiently holds the piezo electric element during manufacturing and operation of the finished sonar device. Preferably the input data of step s2 gives instruction to provide the holder with separate engaging areas for the piezo electric element.

[0062] The disclosure further relates to a method according to FIG. 11 of manufacturing a sonar device 1 comprising the holder as manufactured according to the above. The method of manufacturing a sonar device comprises the steps of [0063] s3 obtaining a holder according to the method above with steps s1 and s2. [0064] s4. positioning a piezo electric element in said holder,

[0065] Step s3 provides for a holder before steps s5 and s6. The piezo electric element needs to be positioned at a certain position and not move around when the manufacture of the sonar device is finished.

[0066] The method further comprises the step of [0067] s5. providing a body element into which said holder comprising the piezo electric element is inserted.

[0068] By inserting the piezo electric element before introducing the package of piezo electric element and the holder to the body element, the holder can also guide the insertion to the body element, and also protect the piezo electric element during the insertion.

[0069] The method further comprises the step of [0070] s6. providing a resin and filling the body element with said resin and covering at the same time said holder and piezo electric element at the same time.

[0071] The resin filling 6 is important for preventing water to enter into contact with the piezo electric element. The resin filling 6 also additionally gives a stabilizing effect on the piezo electric element in cooperation with the holder 4, thus improving the stability of the complete sonar device 1.