WO2017155181A1

WO2017155181A1 - Waveguide for seafloor sediment layer inspecting apparatus

Info

Publication number: WO2017155181A1
Application number: PCT/KR2016/013061
Authority: WO
Inventors: 김병남; 최복경; 정섬규; 김응
Original assignee: 한국해양과학기술원
Priority date: 2016-03-08
Filing date: 2016-11-14
Publication date: 2017-09-14

Abstract

The present invention relates to a waveguide for a seafloor sediment layer inspecting apparatus, and provides a waveguide including a main body of which the top is open and having an accommodating space therein, wherein the main body comprises: a first coupling part provided at one end of the main body such that a transmitter for transmitting a sound wave signal is coupled thereto; a second coupling part provided at another end thereof corresponding to the first coupling part, such that a receiver for receiving the sound wave signal transmitted through the transmitter is coupled thereto; and an insertion part having a through-hole, which is at a right angle to the line on which the first coupling part and the second coupling part are arranged, such that a piston core in which a seafloor sediment layer sample is contained is penetratively inserted into the through-hole. According to the present invention, the piston core itself, having been collected in a state similar to that of real seafloor sediments, is fixed in the insertion part provided in the waveguide, such that a sound sensor is provided to the piston core inside the waveguide in a noncontact manner when sound characteristics of the seafloor sediments are measured, so as to enable the sound characteristics to be accurately measured without disturbing the state of the seafloor sediments.

Description

Waveguides for Subsea Lamination Testing Equipment

The present invention relates to a waveguide for a seabed deposition inspection apparatus.

The study of the ocean uses sound waves rather than the use of electromagnetic waves, which are highly attenuated in the water because the ocean is composed of water, which means waves that propagate through intermolecular vibrations that make up a medium such as liquid or solid. .

As the operational area of an underwater acoustic system, such as sonar, which uses sound waves to detect fish, submarines and mines, and underwater sedimentary exploration, moves into shallow waters, the boundary between sea level and sea level It plays an important role in underwater sound wave transmission.

Here, the sea floor is the boundary area between the seabed and the ocean, and since the physical characteristics are different from those of the ocean, in order to understand the sound wave propagation underwater, sound characteristics such as sound velocity and attenuation, which are basic environmental variables of the seabed, can be derived. There is a need for an acoustic model.

Subsea sediment is composed of sand, sediment, or a mixture of sand and sediment, so there is a difference in the measurement of acoustic characteristics, and the sound wave detection value of the object that can be detected underwater such as submarine and mine is different depending on the composition of the sedimentary sediment. As a result, the research on the measurement of the acoustic characteristics of the seabed according to the frequency of underwater sound waves has been conducted in various angles.

Republic of Korea Patent Publication No. 10-1248829 (hereinafter referred to as 'prior art') is a technique for taking a portion of the sample from the piston core from which the sea sediment is collected, and measuring the sound wave propagation speed in the horizontal and vertical directions from the collected sample Has been presented. To this end, holes are formed on each surface of the case containing the sample, and the sound wave propagation speed of the sample deposited undersea is measured by installing a transmitter and a receiver in the formed hole.

However, in the prior art, the transmitter and the receiver are mounted on a case containing a sample to measure the sound wave propagation speed by transmitting and receiving sound waves, and thus there is no separate fixing means for fixing the transmitter and the receiver. There is a problem that the value of the acoustic characteristic measurement result is different even in the small angle change. In addition, since the measurement of the seabed sedimentation sample is made on the ground, it is difficult to maintain the form of the sedimentary layer when it is left for a long time, and thus there is an inevitable problem that an experimental error occurs in analyzing the sample.

An object of the present invention is to provide a waveguide for a subsea deposition inspection apparatus capable of measuring acoustic characteristics such as speed and attenuation of sound waves of a piston core itself, which are collected in a state close to an actual submarine deposit.

In order to achieve the above object, a waveguide for a subsea deposition inspection device according to an embodiment of the present invention includes a main body having an inner receiving space in which an upper surface is opened and water is received as a medium for transmitting a sound wave signal. The main body includes: a first coupling part coupled to a transmitter provided at one end of the main body to transmit a sound wave signal; A second coupling part provided at the other end corresponding to the first coupling part and coupled to a receiver for receiving a sound wave signal transmitted through the transmitter; An insertion portion having a through hole formed at right angles to an arrangement line between the first coupling portion and the second coupling portion, through which a piston core containing a subsea deposited sample is inserted in the through hole; And at least one hole formed in the lower portion of the main body to discharge water contained in the inner accommodating space, wherein the inner accommodating space is a first portion in the direction of the first coupling part based on the center of the insertion part; The accommodation space may be divided into a second accommodation space in the direction of the second coupling part, and the first accommodation space may have a length of at least 1.5 times to 2.5 times that of the second accommodation space.

In addition, the upper cover is provided with a transparent material and coupled to the upper surface of the main body; may further include.

The drainage portion may include at least one drainage hole, and may include a drainage plug blocking the drainage hole.

As described above, the present invention has the following effects.

First, the water used as the propagation medium of the sound wave is accommodated inside the waveguide, and the piston core itself, which is collected in a state close to the actual submarine deposit, is fixed to the insertion part provided in the waveguide so that the distance between the transmitter and the piston core satisfies the distant sound field condition. Therefore, in measuring the acoustic characteristics of the seabed sediment, the acoustic sensor is installed inside the waveguide in a non-contact manner to the piston core, so that accurate acoustic properties can be measured without disturbing the state of the seabed sediment.

Second, the sealing member is additionally provided at the first coupling portion, the second coupling portion, and the insertion portion to prevent water from leaking to the outside, to move the waveguide at a predetermined interval in the vertical axis direction, and to measure the acoustic characteristics of the seabed deposition layer. In addition to fixing the collected piston core, it is possible to further fix the transmitter and the receiver for measuring the acoustic characteristics to prevent the possibility of error caused by the change of the measurement angle.

Third, it is possible to check the distance between the transmitter and the receiver inside the waveguide due to the upper cover of the transparent material provided on the upper surface of the waveguide, it is easy to check the amount of water and bubble generation used as the sound wave propagation medium.

Figure 1 shows a seabed bottom sediment floor inspection apparatus according to an embodiment of the present invention.

2 is a cross-sectional view of a waveguide according to an embodiment of the present invention.

3 is a plan view of a waveguide according to an embodiment of the present invention.

4 is a perspective view of a waveguide according to an embodiment of the present invention.

5 is a cutaway perspective view of a waveguide according to an embodiment of the present invention.

Preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings, but the well-known technical parts will be omitted or compressed for brevity of description.

Figure 1 shows a seabed deposition inspection apparatus 10 according to an embodiment of the present invention, Figure 2 is a cross-sectional view of the waveguide 100 according to an embodiment of the present invention, Figure 3 is an embodiment of the present invention 4 is a plan view of a waveguide 100 according to an example, and FIG. 4 is a perspective view of the waveguide 100 according to an embodiment of the present invention.

As shown in FIG. 1, the subsea deposition inspection apparatus 10 includes a waveform measuring instrument, a control unit, an amplifier and a waveguide 100, a guide rail 200, a holder 300, and a feeder 400. The upper and lower portions of the piston core (P) from which the seabed sediment sample is taken may be fixed by the holder (300), and the transmitter (T) and the receiver (R) are connected to each other and the piston core (P) is disposed at the center. The inserted waveguide 100 may be moved at predetermined intervals in the vertical axis direction of the piston core P, and the acoustic characteristics of each height of the seabed deposition layer may be measured.

Here, the holder 300 for fixing the upper and lower portions of the piston core (P) is connected to the guide rail 200 that can flow in the vertical axis direction can be fixed to the appropriate position according to the length of the piston core, the waveguide 100 ) Is connected to the feeder 400 is possible to flow in the vertical axis direction of the piston core (P).

At this time, the piston core (P) used for the measurement is dropped along with the weight on the bottom of the sea and is embedded in the bottom of the sea, and means the bottom sedimentary sampling tool from which the sample of the seabed is deposited, and affects the measurement result in the acoustic characteristic measurement. It may be provided in the form of a rigid tube with less influence.

As shown in FIGS. 2, 3, and 4, the waveguide 100 used in the subsea deposition inspection apparatus 10 has an upper surface, and a main body 110 and an upper surface of the main body 110 having an accommodation space therein. It is configured to include an upper cover 120 coupled to.

2 and 3, the main body 110 of the waveguide 100 has a first coupling part 111 to which the transmitter T is coupled to one end and a second coupling portion to which the receiver R is coupled to the other end ( 112 and an insertion portion 113 through which the piston core P is inserted is provided between the first coupling portion 111 and the second coupling portion 112.

Here, the first coupling portion 111 and the second coupling portion 112 are formed with a first coupling hole 111a and a second coupling hole 112a to which the transmitter T and the receiver R can be coupled, respectively. The insertion portion 113 has a through hole 113a through which the piston core can be inserted.

At this time, the piston core (P) should be located in the receiving space in the main body 110, the receiving space in the main body 110 is the first receiving in the direction of the first coupling portion 111 from the center of the insertion portion 113. It may be divided into a second receiving space (S2) in the direction of the space (S1) and the second coupling portion (112).

In addition, the length D1 of the first accommodating space S1 and the length D2 of the second accommodating space S2 may vary depending on the diameter of the piston core P, the frequency and the diameter of the transmitter T. The length D1 of the first accommodating space S1 may have a length of at least 1.5 times to 2.5 times that of the length D2 of the second accommodating space S2.

Here, a case of using a transmitter having a frequency of 40 kHz will be described as an example, from the transmitter (T) coupled to the first coupling portion 111 to the outer peripheral surface of the piston core (P) inserted through the insertion portion 113 Since it is ideal to satisfy the distance beyond the far field condition where the distance is about twice the wavelength, the first accommodation space such that the distance to the outer peripheral surface of the transmitter T and the piston core P satisfies the distance beyond the far field condition. The length D1 of S1 is preferably provided including a distance of about 75 mm or more and a radius of the piston core P, which is about twice the wavelength of the wavelength at a frequency of 40 kHz.

At this time, the receiver (R) coupled to the second coupling portion (112) is installed in contact with the outer peripheral surface of the piston core (P), the first to check whether the receiver (R) and the piston core (P) contact with the naked eye. 2 The length D2 of the accommodation space should be spaced apart from each other, and may have a length of about 0.5 times the length D1 of the first accommodation space.

In addition, the inner receiving space of the main body 110 may be filled with a medium (M) for transmitting sound waves, and water is preferably accommodated.

In addition, the transmitter T in the first coupling hole 111a to which the transmitter T is coupled, the second coupling hole 112a to which the receiver R is coupled, and the through hole 113a into which the piston core P is inserted, respectively. ), A receiver (R), and a piston core (P) is provided with a sealing member (not shown), such as an O-ring, so that the gap that may occur and water filled in the receiving space inside the main body 110 does not leak to the outside. Can be.

In this case, a sealing member is additionally provided at the first coupling part 111, the second coupling part 112, and the insertion part 113 to secure the piston core from which the subsea deposition is collected, as well as a transmitter for measuring acoustic characteristics. It is possible to fix the (T) and the receiver (R) so that it is possible to accurately measure the acoustic characteristics in the measurement of the acoustic characteristics, which increases the possibility of error due to the minute measurement angle change.

In addition, a sealing member may be provided at both the upper and lower portions of the insertion portion into which the piston core P is inserted, and the waveguide 100 is connected to the seabed deposition inspection apparatus 10 in the vertical axis direction of the piston core P. When moving the predetermined interval, both the upper and lower parts are firmly fixed and moved together with the waveguide, and when the movement of the waveguide prevents the axis of the waveguide from shifting, an error occurs in the acoustic characteristic measurement value and water leaks due to the gap formed by the axis shifting. The phenomenon can be prevented beforehand.

2 and 3, the lower portion of the main body 110 is provided with a drain portion 114 for discharging the water contained in the receiving space, the drain portion 114 is formed with at least one drain hole (114a) And a drain plug 114b for blocking the drain hole 114a.

Here, the drain portion 114 may be used to discharge the water contained in the waveguide 100 to the outside by removing the drain plug 114b when the acoustic characteristic measurement of the piston core P is finished.

Referring to Figure 4, the upper cover 120 is coupled to the upper surface of the waveguide 100 main body 110.

At this time, the amount of water contained in the waveguide 100 when measuring the acoustic characteristics of the piston core (P) should maintain a constant level that can be locked to the transmitter (T) and the receiver (R), and the error of the acoustic characteristic measurement value during the measurement The upper cover 120 is provided with a transparent material that is easy to check the distance and the amount of water and bubbles of the transmitter (T) and the receiver (R) inside the main body 110 because it is necessary to check whether the bubbles are caused to occur. It is preferable.

In addition, when measuring the acoustic characteristics of the piston core (P) when the foreign material is introduced into the waveguide 100 through the upper cover 120 or if the water contained in the waveguide 100 is contaminated visually confirmed the drainage portion 114 After discharging the foreign matter or contaminated water through the outside) and filling the water inside the waveguide 100 again can be measured.

Here, the through hole corresponding to the piston core (P) is formed in the upper cover 120, the piston core (P) is inserted through the upper cover (120).

In addition, the upper surface of the main body 110, the stepped 130 is formed, the upper cover 120 is supported by the stepped 130 is coupled to the upper surface of the main body 110.

In addition to the first coupling hole 111a and the second coupling hole 112a, the first coupling portion 111 and the second coupling portion 112 have a transmitter T according to the shape of the transmitter T and the receiver R. ) And the cable connected to the receiver (R) are different, so that a groove in which the cable can be accommodated may be formed.

3 and 4, at least one coupling groove 140 for connecting the waveguide 100 to the subsea deposition inspection apparatus 10 is formed, and the coupling groove 140 and the conveyor 400 are provided. Is connected to move a predetermined interval in the vertical axis direction of the piston core (P) containing the seabed deposition sample, it is possible to measure the acoustic properties of the seabed deposition.

In addition, the receiver R receives a sound wave generated by the transmitter T including a signal reflected by the sound wave hitting the inner wall of the main body 110 in addition to a signal passing through the piston core P, such as noise in the received signal. Although a part of the signal unnecessary for analyzing the measurement result may be included, the waveguide 100 according to the embodiment of the present invention may be attached to the sound absorbing material 150 on the wall surface of the inner receiving space as shown in FIG. Therefore, by absorbing sound waves directed toward the inner wall of the main body 110, the received signal may be prevented from including a signal reflected by the sound waves hitting the inner wall of the main body 100 and may improve the accuracy of the measurement result.

At this time, in one embodiment of the present invention, the sound absorbing material 150 is provided in a wedge shape, but is not limited thereto and may be provided in an egg plate shape, a square shape, or the like.

As a result, according to the present invention, the piston core is inserted through, and the waveguide combined with the transmitter and the receiver in a direction perpendicular to the piston core is moved by a predetermined distance in the vertical axis direction of the piston core to the piston core by the transmitter and the receiver coupled to the waveguide. It is possible to measure acoustic characteristics such as sound velocity and attenuation for the samples of the collected seabed by the height of the seabed. At this time, the sealing member is additionally provided at the first coupling portion, the second coupling portion, and the insertion portion formed in the waveguide to prevent water from leaking to the outside, and to fix the piston core from which the submarine deposited layer is collected, as well as measuring acoustic characteristics. It is possible to fix the transmitter and the receiver for the purpose of making it firmly fixed, and the acoustic sensor is used to measure the acoustic characteristics of the underwater sediment by fixing the piston core itself, which is collected near the actual underwater sediment, to the insertion part provided in the waveguide. Since the piston core is installed inside the waveguide in a non-contact manner, accurate acoustic characteristics can be measured without disturbing the state of the submarine deposits.

As described above, the detailed description of the present invention has been made by the embodiments with reference to the accompanying drawings. However, since the above-described embodiments have only been described with reference to preferred embodiments of the present invention, the present invention is limited to the above embodiments. It should not be understood that the scope of the present invention is to be understood by the claims and equivalent concepts described below.

10: Subsea deposition tester

100: waveguide

110: body

111: first coupling part

111a: first coupling hole

112: second coupling portion

112a: second coupling hole

113: insertion portion

113a: through hole

114: drainage part

114a: drainage hole

114b: Drain cap

120: top cover

130: step

140: coupling hole

150: sound absorbing material

200: guide rail

300: Holder

400: conveyor

P: Piston Core

M: Medium

T: transmitter

R: Receiver

S1: first accommodation space

S2: second accommodation space

Claims

And a main body having an upper receiving surface and an inner receiving space in which water is received as a medium for transmitting sound wave signals.

The main body,

A first coupling part coupled to a transmitter provided at one end of the main body to transmit a sound wave signal;

A second coupling part provided at the other end corresponding to the first coupling part and coupled to a receiver for receiving a sound wave signal transmitted through the transmitter;

An insertion portion having a through hole formed at right angles to an arrangement line between the first coupling portion and the second coupling portion, through which a piston core containing a subsea deposited sample is inserted in the through hole; And

And at least one hole formed in the lower portion of the main body to discharge water contained in the inner accommodation space.

The inner accommodating space is divided into a first accommodating space in a direction of the first engaging portion and a second accommodating space in a direction of the second engaging portion with respect to a center of the insertion portion, and the first accommodating space is the second accommodating space. Compared to having a length of at least 1.5 times to 2.5 times

wave-guide.
The method of claim 1,

And an upper cover provided with a transparent material and coupled to the upper surface of the main body.

wave-guide.
The method of claim 1,

The drain portion is formed with at least one drain hole, characterized in that it comprises a drain plug for blocking the drain hole

wave-guide.