KR102170736B1 - The acceleration sensor applicable to a toward array sensor in underwater - Google Patents

Abstract

Provided is an acceleration sensor with improved performance and sensitivity. The acceleration sensor comprises: a hollow cylindrical outer case; a vertical base which divides an inner space of the outer case into a first side and a second side; a first insulator attached to both sides of the vertical base; a second insulator formed to be spaced apart in a direction away from the first insulator from the vertical base; a plurality of piezoelectric single crystals disposed between the first insulator and the second insulator; and a mass body coupled to the second insulator on the opposite side of the piezoelectric single crystal. The vertical base, the first insulator, the second insulator, the piezoelectric single crystal, and the mass body are formed with through holes into which connecting rods are inserted, and both ends of the connecting rods are screwed with a nut portion to fasten the vertical base, the first insulator, the second insulator, and the piezoelectric single crystal. The outer case for accommodating the vertical base, the first insulator, the second insulator, the piezoelectric single crystal, and the mass body can be coupled with a cap portion in both directions along an axial direction.

Description

The acceleration sensor applicable to a toward array sensor in underwater}

The embodiments relate to an acceleration sensor applicable to a linear towing sensor, and more particularly, to an acceleration sensor with improved performance and sensitivity by maintaining linearity and reducing organic vibration.

In general, when a pre-array towing sensor applied with a hydrophone that detects only the pressure of sound waves is applied to an underwater detection sonar, it is difficult to distinguish the left and right of the target being monitored, so it is limited to detect the direction of the target. Accordingly, when a suspicious signal of a target in the water is detected, the ambiguity of the left and right division due to a false target may occur, and there is a limitation in that the left and right division of the target can be distinguished only through an additional turning operation.

In order for the pre-array towing sensor to detect the size and direction of a target, a vector hydrophone that simultaneously detects the size and direction of an incident sound wave is essential. The vector hydrophone refers to a sensor that performs the function of separating the left and right of the target, and the vector hydrophone may be composed of an omni-directional hydrophone and a 2-axis acceleration sensor or a 3-axis acceleration sensor.

Currently, the pre-array towing sensor has a structure to fix the package (non-directional hydrophone and acceleration sensor) to the support rope.In this structure, the support rope rotates when towing the pre-array towing sensor or when winding/feeding the winch. So it can be twisted.

When configuring a plurality of acceleration sensors on a support rope in a linear arrangement, the axis must have a structure that changes linearly. If a structure in which the axes of the plurality of acceleration sensors change linearly cannot be maintained, the detection direction of each acceleration sensor is changed, and the performance of the direction detection of the pre-array towing sensor is deteriorated.

In addition, when the acceleration sensor is miniaturized, the piezoelectric material of the acceleration sensor also needs to be miniaturized, resulting in deterioration of the performance of the acceleration sensor. The acceleration sensor according to the embodiment may be applied by dividing a piezoelectric single crystal having excellent piezoelectric performance into a linear array to improve the above-described problems. Accordingly, degradation of the acceleration sensor due to the miniaturized piezoelectric material can be prevented. In addition, by maintaining the acceleration sensor in an air backing state, it is intended to improve the sensitivity of the acceleration sensor.

In addition, open cell foam and urethane foam may be applied to the acceleration sensor according to the embodiment. Accordingly, when the acceleration sensor is applied to the pre-array towing sensor, the movement of the towing box and the decrease in detection performance due to the flow induced vibration of the towing cable and tail rope are reduced Can be prevented.

The embodiments provide an acceleration sensor with improved performance and sensitivity by maintaining linearity and reducing organic vibration.

It provides a pre-array towing sensor including an acceleration sensor with improved performance and sensitivity.

The technical problems to be achieved by the present embodiments are not limited to the technical problems as described above, and other technical problems may be inferred from the following embodiments.

An acceleration sensor according to an embodiment includes a hollow cylindrical outer case; A vertical base dividing the inner space of the outer case into a first side and a second side; A first insulator attached to both sides of the vertical base; A second insulator formed to be spaced apart from the first insulator in a direction away from the vertical base; A plurality of piezoelectric single crystals disposed between the first insulator and the second insulator; And a mass body coupled to the second insulator at the opposite side of the piezoelectric single crystal; wherein, the vertical base, the first insulator, the second insulator, the piezoelectric single crystal, and the mass body have a through hole into which a connecting rod is inserted. And, both ends of the connecting rod are screwed with the nut portion to fasten the vertical base, the first insulator, the second insulator, the piezoelectric single crystal, and the mass body, and the vertical base, the first insulator, and the first insulator 2 The insulator, the piezoelectric single crystal, and the outer case accommodating the mass body are coupled to the cap portion in both directions along the longitudinal direction.

The outer case and the cap portion may be in close contact with each other through an O-ring.

A plurality of O-rings may be disposed between the outer case and the cap part.

Urethane foam for reducing organic vibration may be attached to the cap portion.

The cap portion may have a protrusion extending outwardly along the longitudinal direction of the outer case, and the cap portion may be coupled to the urethane foam through the protrusion.

The protrusion may have a polygonal transverse cross section, and the urethane foam may have a transverse cross section of a shape corresponding to the protrusion.

The acceleration sensor may be connected to the support rope through the urethane foam.

In the mass body, a recessed portion through which both ends of the connecting rod may protrude may be formed, and the nut portion may be screwed to the both ends within the recessed portion.

A circular stepped portion may be formed in the depression.

The acceleration sensor according to another embodiment may further include an open cell foam surrounding at least a part of the outer surface of the outer case to reduce vibration transmitted to the acceleration sensor.

The open cell foam may include at least one of rubber, urethane, and resin compounds, which are oil-resistant materials.

The pre-array towing sensor according to another embodiment may include the above-described acceleration sensor.

The acceleration sensor according to the embodiment prevents deterioration of the performance of the acceleration sensor due to the downsizing of the piezoelectric single crystal by dividing the piezoelectric single crystal having excellent piezoelectric performance into a linear array and applying it. In addition, it is possible to improve the sensitivity of the acceleration sensor by maintaining the acceleration sensor in an air backing state.

Open cell foam and urethane foam may be applied to the acceleration sensor according to the embodiment. Accordingly, according to an embodiment, when the acceleration sensor is applied to a pre-array towing sensor, it is possible to remove the influence of the organic vibration generated by the movement of the towing box and the flow of the towing cable and tail rope, so that detection performance may be improved.

1 is an exploded perspective view of an acceleration sensor according to an embodiment.
2 is a combined perspective view of the acceleration sensor according to the embodiment shown in FIG. 1.
3A is a front view of the acceleration sensor according to the embodiment shown in FIG. 2.
3B is a cross-sectional view in the AA direction of the acceleration sensor according to the embodiment shown in FIG. 2.
3C is a cross-sectional view in the BB direction of the acceleration sensor according to the exemplary embodiment shown in FIG. 2.
4 is an exploded perspective view of an acceleration sensor according to another embodiment.
5 is a perspective view of an acceleration sensor according to another embodiment shown in FIG. 4.

The terms used in the examples have selected general terms that are currently widely used as possible while considering functions in the present invention, but this may vary according to the intention or precedent of a technician working in the art, the emergence of new technologies, and the like. In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in this case, the meaning of the terms will be described in detail in the description of the corresponding invention. Therefore, the terms used in the present invention should be defined based on the meaning of the term and the overall contents of the present invention, not a simple name of the term.

When a certain part in the specification "includes" or "includes" a certain element, it means that other elements may be further provided instead of excluding other elements unless otherwise stated. In addition, terms such as "... unit" and "... module" described in the specification mean a unit that processes at least one function or operation, which may be implemented as hardware or software or a combination of hardware and software.

Meanwhile, terms used in the present specification are for explaining embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated in the phrase.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.

1 is an exploded perspective view of an acceleration sensor 100 according to an embodiment.

The acceleration sensor 100 according to an embodiment includes a hollow cylindrical outer case 110, a vertical base 120 that divides the inner space of the outer case 110 into a first side and a second side, and a vertical base 120 The first insulator 130 attached to both sides of the first insulator 130, the second insulator 140 formed spaced apart from the vertical base 120 in a direction away from the first insulator 130, the first insulator 130, and the second insulator 140 ), and a mass body 160 coupled to the second insulator 140 on the opposite side of the piezoelectric single crystal 150 and a plurality of piezoelectric single crystals 150 disposed between them.

At this time, a through hole into which the connecting rod 170 is inserted is formed in the vertical base 120, the first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and the mass body 160, and the connecting rod 170 Both ends are screwed with the nut part 180 to fasten the vertical base 120, the first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and the mass body 160, and the vertical base 120 ), the first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and the outer case 110 accommodating the mass body 160 can be coupled with the cap portion 190 in both directions along the axial direction. I can.

The acceleration sensor 100 according to an embodiment may include a hollow cylindrical outer case 110. At this time, the hollow cylindrical outer case 110 may accommodate components constituting the acceleration sensor 100 in the hollow inside.

The acceleration sensor 100 according to an embodiment includes a vertical base 120 that divides the inner space of the hollow cylindrical outer case 110, that is, the inner hollow of the outer case 110 into a first side and a second side. can do. Acceleration sensor 100 according to an embodiment may be formed in a symmetrical structure around the vertical base 120, in which case, the vertical base 120 is external in a direction crossing the longitudinal axis of the cylindrical outer case 110 The inner space of the case 110 may be divided into a first side and a second side.

The first side and the second side may be opposite to each other, for example, the first side is the center of the vertical base 120 and one side away from the vertical base 120, the second side is the center of the vertical base 120 As a result, it may mean the other direction that is opposite to one of the directions away from the vertical base 120.

In the acceleration sensor 100 according to the embodiment, the first insulator 130 may be attached to both sides of the vertical base 120. For example, there may be two first insulators 130 and may be attached to the first side and the second side of the vertical base 120, respectively.

The first insulator 130 may serve to insulate the piezoelectric single crystal 150 to be described later. The first insulator 130 is a non-conductor capable of preventing electrical flow, and in this case, the material of the first insulator 130 is not limited within the material of the non-conductor and may be changed as necessary.

The acceleration sensor 100 according to an embodiment may include a first insulator 130 and a second insulator 140 formed spaced apart from the first insulator 130 in a direction away from the vertical base 120. The number of second insulators 140 may be two, and each of the second insulators 140 may be formed to be spaced apart from the first insulators 130 corresponding to each other.

At this time, the second insulator 140 is formed to be spaced apart from the first insulator 130 in a direction away from the vertical base 120. That is, the second insulator 140 may be disposed in a direction outside the first insulator 130 based on the vertical base 120, and the distance between the vertical base 120 and the second insulator 140 is the vertical base ( It may be longer than the distance between the 120) and the first insulator 130.

The second insulator 140 may be a non-conductor capable of preventing electrical flow. In this case, the material of the second insulator 140 is not limited within the material of the non-conductor and may be changed as necessary.

The acceleration sensor 100 according to an exemplary embodiment may include a plurality of piezoelectric single crystals 150 disposed between the first insulator 130 and the second insulator 140. The piezoelectric single crystal 150 may exhibit a piezoelectric effect in proportion to a physical change. In the acceleration sensor 100 according to the embodiment, the piezoelectric single crystal 150 may use a shear mode of a piezoelectric material.

The piezoelectric single crystal 150 disposed between the first insulator 130 and the second insulator 140 may be plural. For example, there may be two piezoelectric single crystals 150, and a total of four may be disposed on both sides of the vertical base 120.

The two piezoelectric single crystals 150 may be disposed between the first insulator 130 and the second insulator 140 to be parallel to the longitudinal axis of the outer case 110. That is, the two piezoelectric single crystals 150 may be disposed between the first insulator 130 and the second insulator 140 by being spaced apart by the same distance from the vertical base 120, respectively.

The acceleration sensor 100 according to an embodiment may include a mass body 160 coupled to the second insulator 140 on the opposite side of the piezoelectric single crystal 150. The mass body 160 may transmit vibration from the outside to the piezoelectric single crystal 150. The mass body 160 may preferably be tungsten, stainless steel, or Inconel, but the type of the mass body 160 is not limited thereto. In the acceleration sensor 100 according to the embodiment, if the mass body 160 is heavy, the sensitivity of the acceleration sensor 100 may be improved.

In the acceleration sensor 100 according to the embodiment, the vertical base 120, the first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and the mass body 160 have a through hole into which the connecting rod 170 is inserted. Can be formed.

The connecting rod 170 may be disposed to pass through the vertical base 120, the first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and the mass body 160 in the acceleration sensor 100. At this time, the first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and the mass body 160, which are components of the acceleration sensor 100, are symmetrical around the vertical base 120, and the connecting rod 170 ) Is 1) vertical base 120, 2) a first insulator 130, a second insulator 140, a piezoelectric single crystal 150, a mass 160, 3) located on the second side The first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and the mass body 160 may all pass through.

The centers of the through holes formed in the vertical base 120, the first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and the mass body 160 may be arranged parallel to one axis, and at this time, one The axis may be an axis extending from the longitudinal axis of the connecting rod 170.

Both ends of the connecting rod 170 of the acceleration sensor 100 according to an embodiment are screwed with the nut part 180 so that the vertical base 120, the first insulator 130, the second insulator 140, a piezoelectric single crystal 150 and the mass body 160 can be fastened.

That is, after the connecting rod 170 is disposed to pass through the vertical base 120, the first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and the mass body 160, both ends of the connecting rod 170 By screwing the nut 180 and the connecting rod 170, which is a component through which the connecting rod 170 passes, the vertical base 120, the first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and The mass body 160 may be fastened together.

At this time, both ends of the connecting rod 170 may be formed with threads capable of being screwed with the nut portion 180. The connecting rod 170 includes 1) a vertical base 120, 2) a first insulator 130, a second insulator 140, a piezoelectric single crystal 150, a mass body 160, and 3) a second insulator located on the first side. The first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and the mass body 160 positioned at the side may have a length such that both ends of the connecting rod 170 may be exposed.

In the acceleration sensor 100 according to an embodiment, the vertical base 120, the first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and the outer case 110 accommodating the mass body 160 are It may be combined with the cap portion 190 in both directions along the longitudinal direction.

At this time, the outer case 110 and the cap portion 190 may be formed with a fastening means that can be coupled to each other, the fastening means may be at least one of, for example, screws, pins, fitting, but the outer case 110 and the cap portion As long as 190 can be coupled to each other, the means of coupling is not limited thereto and may be changed as necessary.

In this case, the outer case 110 and the cap portion 190 may be closely coupled through an O-ring 50. That is, the O-ring 50 may be disposed between the outer case 110 and the cap unit 190, and for example, the O-ring 50 may be disposed to surround at least a portion of the fastening means.

The O-ring 50 may serve to closely couple the outer case 110 and the cap unit 190 to each other. As the outer case 110 and the cap unit 190 are closely coupled through an O-ring 50, the acceleration sensor 100 may maintain an air backing state. As the acceleration sensor 100 maintains an air backing state, the sensitivity of the acceleration sensor 100 may be improved and more detailed sensing may be performed.

An accommodating portion capable of accommodating the O-ring 50 may be formed in a portion of the outer case 110 or a portion of the cap portion 190. The receiving portion may be, for example, a groove corresponding to the size and shape of the O-ring 50

A plurality of O-rings 50 may be disposed between the outer case 110 and the cap unit 190, for example, two O-rings 50 are disposed in each direction of the outer case 110. I can. That is, a total of four O-rings 50 may be arranged to closely couple the outer case 110 and the cap unit 190 to each other. The number of the O-rings 50 is not limited thereto and may be changed as necessary.

In the acceleration sensor 100 according to an embodiment, a urethane foam 200 for reducing organic vibration may be attached to the cap 190. At this time, a protrusion 195 extending outwardly along the length direction of the outer case 110 is formed in the cap portion 190 of the acceleration sensor 100 according to an embodiment, and the cap portion 190 is formed through the protrusion 195. It may be bonded to the urethane foam 200.

The urethane foam 200 may be coupled to the cap portion 190 of the acceleration sensor 100 to reduce external organic vibration that may be transmitted to the acceleration sensor 100. At this time, the urethane foam 200 is coupled to the cap unit 190 through a protrusion 195 extending outward along the longitudinal direction of the outer case 110, and the urethane foam 200 is the protrusion 195 of the outer case 110. Can wrap at least a portion of ).

The protrusion 195 may have a polygonal transverse cross-section, and the urethane foam 200 may have a transverse cross-section of a shape corresponding to the protrusion 195. For example, the protrusion 195 may have a rectangular cross-section, and the urethane foam 200 may also have a rectangular cross-section so as to correspond to the protrusion 195. The size and shape of the urethane foam 200 may correspond to the shape and size of the protrusion 195, and the urethane foam 200 may have a shape and size capable of wrapping at least a portion of the protrusion 195.

The acceleration sensor 100 may be connected to the support rope through the urethane foam 200. At this time, at least a portion of the support rope is in contact with the urethane foam 200 and may connect between the acceleration sensors 100, and the support rope may be plural. For example, two support ropes may be connected to the urethane foam 200 while wrapping each of the two opposite corners of the urethane foam 200.

In the acceleration sensor 100 according to an embodiment, a recessed portion through which the end of the connecting rod 170 can protrude is formed in the mass body 160, and the nut portion 180 has an end and a screw of the connecting rod 170 within the recessed portion. Can be combined.

A depression may be formed in the mass body 160 of the acceleration sensor 100 according to an embodiment, and the depression may be formed on a surface of the mass body 160 in a direction facing away from the vertical base 120. have. As the depression is formed, the end of the connecting rod 170 may protrude out of the bowl portion of the mass body 160. At this time, the nut part 180 may be screwed with the end of the connecting rod 170 in the recessed portion to tightly fasten the components of the acceleration sensor 100 fastened to the connecting rod 170.

The shape of the depression may be, for example, a cylindrical shape, and a circular stepped portion may be formed therein. The recessed portion may have a size and shape capable of accommodating the nut portion 180, but the size and shape of the recessed portion are not limited thereto.

FIG. 2 is a perspective view of an acceleration sensor 100 according to an exemplary embodiment illustrated in FIG. 1.

Referring to FIG. 2, the external shape of the acceleration sensor 100 according to an embodiment can be known in more detail.

The acceleration sensor 100 according to an embodiment includes a hollow cylindrical outer case 110, a vertical base 120 that divides the inner space of the outer case 110 into a first side and a second side, and a vertical base 120 The first insulator 130 attached to both sides of the first insulator 130, the second insulator 140 formed spaced apart from the vertical base 120 in a direction away from the first insulator 130, the first insulator 130, and the second insulator 140 ), and a mass body 160 coupled to the second insulator 140 on the opposite side of the piezoelectric single crystal 150 and a plurality of piezoelectric single crystals 150 disposed between them.

At this time, a through hole into which the connecting rod 170 is inserted is formed in the vertical base 120, the first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and the mass body 160, and the connecting rod 170 Both ends are screwed with the nut part 180 to fasten the vertical base 120, the first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and the mass body 160, and the vertical base 120 ), the first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and the outer case 110 accommodating the mass body 160 can be coupled with the cap portion 190 in both directions along the axial direction. I can.

The acceleration sensor 100 according to an embodiment may include a hollow cylindrical outer case 110. At this time, the hollow cylindrical outer case 110 may accommodate components constituting the acceleration sensor 100 in the hollow inside.

As the outer case 110 accommodates the components constituting the acceleration sensor 100 in an inner hollow, the acceleration sensor 100 according to an embodiment may change the length direction of the outer case 110 and the outer case 110. Accordingly, through the cap unit 190 coupled with the outer case 110 in both directions, the protrusion 195 extending outward from the cap unit 190, and the urethane foam 200 bonded to the cap unit 190 through the protrusion 195 Can shape the appearance. At this time, the configuration and effect of the acceleration sensor 100 according to an embodiment are the same as described above, and detailed descriptions in the overlapping range will be omitted.

3A is a front view of the acceleration sensor 100 according to the embodiment shown in FIG. 2, FIG. 3B is a cross-sectional view in the AA direction of the acceleration sensor 100 according to the embodiment shown in FIG. 2, and FIG. 3C is 2 is a cross-sectional view in the BB direction of the acceleration sensor 100 according to the embodiment shown in FIG.

Referring to FIG. 3A, an external shape in the front direction of the acceleration sensor 100 according to an embodiment can be seen, and the external shape in the front direction of the acceleration sensor 100 according to an embodiment is outside the cap portion 190 and the cap portion 190. It can be seen that the urethane foam 200 coupled with the cap portion 190 through the protrusion 195 and the protrusion 195 extending to each other are formed by bonding with each other.

At this time, the acceleration sensor 100 according to an embodiment may be connected to the support rope through the urethane foam 200, and at this time, the support rope is in contact with the urethane foam 200 at least at a portion, and between the acceleration sensors 100 It can be connected and there may be a plurality of support ropes. For example, two support ropes may be connected to the urethane foam 200 while wrapping each of the two opposite corners of the urethane foam 200.

Referring to FIG. 3B, a cross-sectional shape in the A-A direction of the acceleration sensor 100 according to an exemplary embodiment can be known in more detail.

Referring to FIG. 3B, it can be seen that the outer case 110 and the cap unit 190 are closely coupled through the O-ring 50.

At this time, the O-ring 50 may serve to closely couple the outer case 110 and the cap unit 190 to each other. As the outer case 110 and the cap unit 190 are closely coupled through the O-ring 50, the acceleration sensor 100 may maintain an air backing state. One portion of the outer case 110 or a portion of the cap portion 190 may be formed with an accommodating portion capable of accommodating the O-ring 50, and the accommodating portion, for example, the size and shape of the O-ring 50 It may be a groove corresponding to

The vertical base 120 may be located at the center of the outer case 110, and at this time, the position of the vertical base 120 may be maintained through the fixing part 175 inserted from the outer case 110. That is, the fixing part 175 may be inserted into the outer case 110 through the groove formed on the outer surface of the outer case 110, and the inserted fixing part 175 is combined with the vertical base 120 to It may serve to maintain the position of the base 120. The fixing part 175 may be, for example, at least one of a screw, a bracket, and a pin, but is not limited thereto.

Referring to FIG. 3C, a cross-sectional shape in the B-B direction of the acceleration sensor 100 according to an embodiment can be known in more detail.

Referring to FIG. 3C, in the acceleration sensor 100 according to an embodiment, the connecting rod 170 is an internal component of the acceleration sensor 100, 1) a vertical base 120, and 2) a first one positioned on the first side. Insulator 130, second insulator 140, piezoelectric single crystal 150, mass body 160, 3) first insulator 130, second insulator 140, piezoelectric single crystal 150 positioned on the second side , It can be seen that the mass body 160 passes all, and at this time, the connecting rod 170 is screwed with the nut part 180 to fasten the internal components.

In the acceleration sensor 100 according to an embodiment, it can be seen that the mass body 160 is extended and disposed along the length direction of the outer case 110, and the mass body 160 is a piezoelectric single crystal 150 to prevent vibration from the outside. Can play a role in conveying to. In this case, the mass body 160 may preferably be tungsten, stainless steel, or Inconel, but the type of the mass body 160 is not limited thereto. In the acceleration sensor 100 according to the embodiment, if the mass body 160 is heavy, the sensitivity of the acceleration sensor 100 may be improved. As the mass body 160 is disposed to extend along the length direction of the outer case 110 The mass body 160 may become heavier, and accordingly, the sensitivity of the acceleration sensor 100 may be further improved.

4 is an exploded perspective view of the acceleration sensor 100 according to another embodiment, and FIG. 5 is a combined perspective view of the acceleration sensor 100 according to another embodiment shown in FIG. 4.

The acceleration sensor 100 according to another embodiment includes a hollow cylindrical outer case 110, a vertical base 120 for dividing the inner space of the outer case 110 into a first side and a second side, and a vertical base 120 The first insulator 130 attached to both sides of the first insulator 130, the second insulator 140 formed spaced apart from the vertical base 120 in a direction away from the first insulator 130, the first insulator 130, and the second insulator 140 ), and a mass body 160 coupled to the second insulator 140 on the opposite side of the piezoelectric single crystal 150 and a plurality of piezoelectric single crystals 150 disposed between them.

At this time, a through hole into which the connecting rod 170 is inserted is formed in the vertical base 120, the first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and the mass body 160, and the connecting rod 170 Both ends are screwed with the nut part 180 to fasten the vertical base 120, the first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and the mass body 160, and the vertical base 120 ), the first insulator 130, the second insulator 140, the piezoelectric single crystal 150, and the outer case 110 accommodating the mass body 160 can be coupled with the cap portion 190 in both directions along the axial direction. I can.

The acceleration sensor 100 according to another embodiment may further include an open cell foam 250 surrounding at least a part of the outer surface of the outer case 110 to reduce vibration transmitted to the acceleration sensor 100.

The configuration and effect of the acceleration sensor 100 according to the other embodiment except the open cell form 250 are the same as the configuration and effect of the acceleration sensor 100 according to the embodiment, and detailed description in the overlapping range It should be omitted.

The acceleration sensor 100 according to another embodiment further includes an open cell foam 250, and the open cell foam 250 may be disposed to surround at least a part of the outer surface of the outer case 110. The open cell foam 250 may have a shape and size surrounding the outer surface of the outer case 110, and together with the outer case 110 may form the outer shape of the acceleration sensor 100 according to another embodiment.

This can be seen in more detail by looking at FIG. 5 showing a combined perspective view of the acceleration sensor 100 according to another embodiment shown in FIG. 4. In the acceleration sensor 100 according to another embodiment

As the outer case 110 accommodates the components constituting the acceleration sensor 100 in an inner hollow, the acceleration sensor 100 according to another embodiment may change the length direction of the outer case 110 and the outer case 110. Accordingly, through the cap unit 190 coupled with the outer case 110 in both directions, the protrusion 195 extending outward from the cap unit 190, and the urethane foam 200 bonded to the cap unit 190 through the protrusion 195 Can shape the appearance. In this case, the open cell foam 250 may be disposed to surround at least a part of the outer surface of the outer case 110, and the open cell foam 250 may also form the outer shape of the acceleration sensor 100.

The open cell foam 250 may include at least one of rubber, urethane, and resin compounds which are oil-resistant materials. For example, the rubber may be NBR-based rubber, the urethane may be polyurethane, and the resin compound may be polypropylene (P.P) or polyethylene (P.E). In this case, the open cell foam 250 may include a material having a large damping coefficient so as to reduce vibration transmitted from the outside, thereby improving the sensitivity of the acceleration sensor 100.

Table 1 is a result showing the number of vibrations when a vibration test was performed by applying a silicone foam, an open cell foam 250, and a urethane foam 200 to the acceleration sensor 100, respectively. Referring to Table 1, the vibration level is reduced when silicon foam, open cell foam 250, and urethane foam 200 are applied to the acceleration sensor 100 than when a test with the acceleration sensor 100 alone is performed. I can see that it is.

Since the open cell foam 250 and the urethane foam 200 are applied to the acceleration sensor 100 according to the embodiments, the influence of the organic vibration transmitted to the acceleration sensor 100 can be removed, and thus the sensitivity of the acceleration sensor 100 Can be improved.

Regarding Examples The acceleration sensor 100 prevents performance degradation of the acceleration sensor 100 due to miniaturization of the piezoelectric single crystal 150 by dividing and applying the piezoelectric single crystal 150 having excellent piezoelectric performance into a linear array. Also, by maintaining the acceleration sensor 100 in an air backing state, the sensitivity of the acceleration sensor 100 may be improved.

In the acceleration sensor 100 according to the embodiments, the open cell foam 250 and the urethane foam 200 are applied, so that when the acceleration sensor 100 is applied to the pre-array towing sensor, the movement of the tow box and the flow of the towing cable and tail rope It is possible to remove the effect of the organic vibration generated by the result, it is possible to improve the detection performance.

In addition, a pre-array towing sensor to which the acceleration sensor 100 according to the above-described embodiments is applied may be provided as another embodiment.

Those of ordinary skill in the technical field related to the present embodiments will appreciate that it may be implemented in a modified form without departing from the essential characteristics of the above-described description. Therefore, the disclosed methods should be considered from an explanatory point of view rather than a limiting point of view. The scope of the present invention is shown in the claims rather than the above description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

50: O-ring 100: acceleration sensor
110: outer case 120: vertical base
130: first insulator 140: second insulator
150: piezoelectric single crystal 160: mass
170: connecting rod 175: fixing part
180: nut portion 190: cap portion
195: protrusion 200: urethane foam
250: open cell form

Claims (12)

A hollow cylindrical outer case;
A vertical base dividing the inner space of the outer case into a first side and a second side;
A first insulator attached to both sides of the vertical base;
A second insulator formed to be spaced apart from the first insulator in a direction away from the vertical base;
A plurality of piezoelectric single crystals disposed between the first insulator and the second insulator; And
Including; a mass body coupled to the second insulator on the opposite side of the piezoelectric single crystal,
The vertical base, the first insulator, the second insulator, the piezoelectric single crystal, and the mass body are formed with through holes into which a connecting rod is inserted,
Both ends of the connecting rod are screwed with a nut portion to fasten the vertical base, the first insulator, the second insulator, the piezoelectric single crystal, and the mass body,
The outer case accommodating the vertical base, the first insulator, the second insulator, the piezoelectric single crystal, and the mass body is coupled with the cap portion in both directions along the length direction,
The acceleration sensor, to which a urethane foam for reducing organic vibration is attached to the cap portion. The method of claim 1,
The acceleration sensor, wherein the outer case and the cap portion are closely coupled through an O-ring. The method of claim 2,
The O-ring is arranged in plurality between the outer case and the cap portion, the acceleration sensor. delete The method of claim 1,
The cap portion is formed with a protrusion extending outward along the length direction of the outer case,
The cap portion is coupled to the urethane foam through the protrusion, acceleration sensor. The method of claim 5,
The protrusion has a polygonal transverse cross section, and the urethane foam has a transverse cross section of a shape corresponding to the protrusion. The method of claim 5,
The acceleration sensor is connected to the support rope through the urethane foam, acceleration sensor. The method of claim 1,
The mass body is formed with a depression through which both ends of the connecting rod can protrude,
The nut portion is screwed to the both ends in the depression, the acceleration sensor. The method of claim 8,
A circular stepped portion is formed in the depression, the acceleration sensor. The method of claim 1,
The acceleration sensor further comprising an open cell foam surrounding at least a part of an outer surface of the outer case to reduce vibration transmitted to the acceleration sensor. The method of claim 10,
The open cell foam includes at least one of rubber, urethane, and resin compounds which are oil-resistant materials. A pre-array towing sensor comprising the acceleration sensor according to any one of claims 1 to 3 and 5 to 11.

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