Marine sedimental thermoacoustic detection device

Abstract

The marine sediment thermoelectric acoustic detection device can simultaneously measure sediment heat, electricity, sound multi-parameters, realize miniaturized structure design, can effectively reduce the additional resistance caused by the mounted underwater acoustic transducer when pouring into the sediment, realize the design purpose of simultaneously having heat, electricity, sound multi-parameter measurement capability and accurate and reliable measurement data. The electronic cabin including a built-in communication module is welded with an adapter at the bottom of the electronic cabin; the adapter is communicated with a transverse pipe on one side, and the transverse pipe is connected with a transmitting transducer at the end; a plurality of first connecting pieces are arranged, and a group of underwater acoustic transducers are connected between adjacent two groups of first connecting pieces; a plurality of copper rings for measuring electrical conductivity are connected in series at the bottom of the last group of first connecting pieces, and a group of third connecting pieces are connected between adjacent two groups of copper rings for measuring electrical conductivity and at the bottom of the last group of copper rings for measuring electrical conductivity; the third connecting piece of the last group is connected with a fourth connecting piece, and a plurality of groups of NTC thermistors are equidistantly arranged in the probe rod structure.

Description

TECHNICAL FIELD

[0001] The present application relates to a miniaturized detection device applied to in-situ measurement of thermal, electrical and acoustic multi-parameters of seabed sediments, and belongs to the field of marine measurement equipment. BACKGROUND

[0002] The current leading seabed sediment measurement method at home and abroad is based on in-situ measurement technology, which can accurately reflect the type and various properties of sediments. With the rapid development of underwater carrying technology equipment, using a remotely operated vehicle (ROV) or a human-occupied vehicle (HOV) to carry out in-situ measurement of sediments has become a common measurement method. Compared with the traditional sampling measurement method, this method does not change the temperature and pressure environment of the sediments, nor is it limited by the capacity of the sampler, and can well reflect the true characteristics of the sediments.

[0003] Currently, in-situ measurement of the temperature, electrical and acoustic characteristics of marine sediments is mainly through a needle-shaped system. The system is inserted into the sediments by gravity, and the temperature, electrical and acoustic properties of the sediments are measured. Most of the existing systems rely on gravity to penetrate into the sediments, so most of the measurement systems have a weight of several hundred kilograms. The remotely operated vehicle or the human-occupied vehicle has a high volume and weight limit for the detection equipment carried, so it is difficult to carry on the underwater vehicle.

[0004] As attached Figure 1As shown in the prior art real-time multi-frequency field marine sediment geophysical measurement system, the system relies on the gravity into the sediment system altimeter pressure cabin test platform measurement platform: the main function of this part is to realize the acoustic measurement in the sediment, including sound source transmission, signal reception and depth correction. It is composed of acoustic gun (sound probe), sound source transducer, receiving hydrophone, altimeter, inclinometer, sonar transmitter, amplifier, filter, A / D converter, signal processor, power transformer and gravity corer. For gravity corer, its penetration mainly depends on its own weight. The weight of the measurement platform is about 230 kg. According to the needs, the weight of the gravity corer can be increased by lead mass alone. The acoustic gun body (cylinder with receiver) includes two interchangeable long stainless steel pipes, each 4 meters long. Two pipes can be connected together to select 4-meter probe or 8-meter probe. The lead mass load is designed as a triangular balance, and each lead mass is 15 kg. Eight hydrophones are arranged along the specially designed gravity corer cylinder, corresponding to eight independent receiving channels, forming a linear receiving array (acoustic gun or sound probe). Three transducers are arranged on the left side to emit acoustic signals of different frequencies.

[0005] As shown in the following Figure 2 A prior art real-time field marine sediment conductivity measurement system, the mechanical structure of the probe rod of the measurement system is shown in the following Figure 2 The bottom of the probe rod is designed in a conical structure to facilitate insertion into the sediment. The main body of the probe rod is designed in a cylindrical shape using high-strength PVC insulation material with a diameter of 7 cm. Ring-shaped copper electrodes with a diameter of 0.75 cm are arranged at equal intervals on the probe rod, with an electrode spacing of 1 cm, and the total number of measurement electrodes is 100 (which can be expanded according to needs). The electrode leads are led out to the top end through the inside of the cylindrical probe rod. The sediment conductivity is measured by the Wenner method.

[0006] As described above, the existing in-situ measurement device generally has the problems of large volume and high weight, which will lead to the inability of the submersible to work if it is carried on the submersible equipment. Specifically, the hydrophone product used in the existing measurement system is mounted on the probe rod of the sediment measurement system, resulting in a higher protruding part of the probe rod with the mounted hydrophone, which not only increases the penetration resistance of the sediment, but also makes it difficult to ensure that the connection part is not damaged. Moreover, the measurement parameters of the existing measurement system are relatively single, and the temperature, acoustic characteristics (sound speed, sound attenuation) and electrical characteristics (conductivity measurement) of the sediment cannot be measured simultaneously, resulting in large errors in data inversion, difficult to meet the actual field operation requirements of measurement efficiency, and high cost of repeated measurement.

[0007] Therefore, the present application is proposed. SUMMARY

[0008] The marine sediment thermoelectric acoustic detection device described in the present application is proposed to solve the problems existing in the prior art, and is an in-situ measurement device capable of simultaneously measuring sediment heat, electricity and sound multi-parameters, and achieving miniaturized structure design, so as to effectively reduce the additional resistance caused by the mounting type underwater acoustic transducer when it is filled with sediment, and achieve the design purpose of simultaneously having heat, electricity and sound multi-parameter measurement capability and accurate and reliable measurement data.

[0009] To achieve the above design purpose, the marine sediment thermoelectric acoustic detection device comprises an electronic cabin with a built-in communication module, and a adapter is welded at the bottom of the electronic cabin; a transverse pipe is communicated with one side of the adapter, and a transmitting transducer is connected to the end of the transverse pipe; a group of first connecting pieces are communicated with the bottom of the adapter, and threads are distributed on the inner diameter of the first connecting pieces; a group of first connecting pieces are arranged, and a group of underwater acoustic transducers are connected between adjacent two groups of first connecting pieces; a group of copper rings for measuring electrical conductivity are connected in series at the bottom of the last group of first connecting pieces, and a group of third connecting pieces are connected between adjacent two groups of copper rings for measuring electrical conductivity and at the bottom of the last group of copper rings for measuring electrical conductivity; the third connecting piece of the last group is connected to a fourth connecting piece, and the fourth connecting piece has an overall structure with external threads at the top and a solid conical bottom; a hollow probe rod structure is sequentially connected from the adapter to the fourth connecting piece, and a plurality of groups of NTC thermistors are equidistantly arranged in the probe rod structure; after the NTC thermistors are assembled, epoxy resin is filled in the probe rod from the adapter to the fourth connecting piece.

[0010] Further, the transmitting transducer and the connected transverse pipe form an included angle of 100° to 150°.

[0011] Further, the underwater acoustic transducer has a second connecting piece as an inner core, a protective layer wrapped around the outer periphery of the second connecting piece, the length of the second connecting piece is greater than the length of the protective layer, and threads for connecting the inner diameter of the first connecting piece are distributed on the outer diameter of the exposed part of the second connecting piece; the protective layer comprises a backer of acrylic material at the outermost layer, a layer of PVDF film is attached to the inner layer of the backer, and an epoxy resin layer is filled between the outer diameter of the second connecting piece and the backer and the PVDF film.

[0012] Further, the underwater acoustic transducer is provided with a through groove penetrating through the side wall of the second connecting piece before the epoxy resin layer is filled, and the circuit connecting line led out from the electronic cabin is first connected to the PVDF film.

[0013] Further, the PVDF film has through holes on the left and right sides, and the circuit connecting line is led out from the through holes after being pressed and shaped by rivets; conductive silver paste layers are respectively brushed on the left and right sides of the PVDF film by screen printing.

[0014] Further, the third connecting piece comprises an inner part and an outer part connected with each other through inner and outer threads, the inner part is provided with a through slot along its radial direction; the conductivity measuring copper ring is connected to the circuit connecting line through soldering, the circuit connecting line is led out from the through slot, and then the conductivity measuring copper ring is sleeved into the inner part of the third connecting piece from top to bottom; a rubber pad is arranged between the conductivity measuring copper ring and the step of the outer part; after the assembly is completed according to the above steps, an insulating polyurethane layer is coated on the outer circumferential surface of the outer part of the third connecting piece.

[0015] As described above, the marine sediment thermo-electro-acoustic detection device has the advantages that:

[0016] 1. The application realizes an in-situ measuring device with a miniaturized structure, which is designed by using a PVDF film as a piezoelectric material of a hydrophone, so as to effectively reduce the additional resistance caused by the mounted hydrophone when it is filled into the sediment, and the instrument can be better protected from damage.

[0017] 2. The application measures the temperature by using an NTC thermistor, measures the acoustic properties (sound speed and sound attenuation) of the sediment by using a hydrophone, and measures the electrical conductivity characteristics of the sediment by using equidistantly arranged copper electrodes, so as to realize the design effect of simultaneously measuring the thermal, electrical and acoustic multi-parameters of the sediment, and the measurement data is more accurate and the time is shorter.

[0018] 3. On the basis of improving the measurement accuracy, the application optimizes the structure of the detection device to reduce the volume and weight of the whole detection system, and the weight can be less than 30 kg, which helps to reduce the cost of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0019] The application will be further described with reference to the following drawings;

[0020] Figure 1 and Figure 2 respectively are schematic diagrams of a real-time multi-frequency in-situ marine sediment geoacoustic measurement system of the prior art;

[0021] Figure 3 is a schematic diagram of the system workflow of the application;

[0022] Figure 4 is a schematic diagram of the system workflow of the application; Figure 3

[0023] Figure 5 is a schematic diagram of the structure of the marine sediment thermo-electro-acoustic detection device of the application;

[0024] Figure 6 is a sectional view of the first connecting piece;

[0025] Figure 7 is a schematic diagram of the hydrophone;​

[0026] Figure 8 A cross-sectional structure diagram of the underwater acoustic transducer is shown in Figure 7

[0027] Figure 9 A schematic diagram of the PVDF film is shown in

[0028] Figure 10 A schematic diagram of the PVDF film is shown in

[0029] Figure 11 A schematic diagram of the third connecting piece is shown in

[0030] Figure 12 A cross-sectional diagram of the third connecting piece is shown in Figure 12

[0031] Figure 13 A schematic diagram of the conductivity measurement is shown in

[0032] Figure 14 A schematic diagram of the fourth connecting piece is shown in DETAILED DESCRIPTION

[0033] In order to further illustrate the technical means adopted by the present application to achieve the predetermined design purpose, the following more preferred embodiments are presented in conjunction with the accompanying drawings.

[0034] In the following description, specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced without the specific details, other than in the examples, and it will be understood by persons of ordinary skill in the art that the present application can be practiced with multiple and / or different details than those described herein without departing from the scope of the present application. Accordingly, the scope of the present application is not limited to the specific details described in the following description.

[0035] As shown in Figures 3 to 14 , the marine sediment detection system using the marine sediment thermoelectric acoustic detection device described in the present application, after being assembled into standby mode, first wakes up the main control system after the clock system reaches a fixed time, detects the system posture through the posture detection chip, and if the system posture has a large angle change in the Z-axis direction, it means that the system has touched the bottom and is in use. At this time, the temperature acquisition unit is powered by the direct current power supply.

[0036] ​​The detection system collects the output signal of the temperature measuring unit at a frequency of 10Khz and stores the signal into the memory card. Meanwhile, the main control chip controls the sinusoidal wave transmitting circuit to transmit 7 cycles of sinusoidal wave signals, the amplitude of the sinusoidal wave signals is 30Vpp, and the sinusoidal wave signals are converted into acoustic wave signals by the underwater acoustic transducer. At the same time of transmitting the acoustic wave signals, the data acquisition terminal collects the output of two transmitting transducers at 200Khz, 1024 data of each transmitting transducer are collected, and a total of 2048 data are collected, each group of data is stored into the memory card after the data acquisition is completed. The circuit generates an alternating constant current source to supply 100mA of alternating constant current source to the copper electrode, the voltage values of the two groups of copper electrodes in the middle are measured and stored, and the time of each data acquisition is recorded at the same time of completing the data storage.

[0037] The communication module of the measurement data includes a main control chip, an underwater acoustic signal detection device composed of a sinusoidal wave circuit, a transmitting transducer, a receiving transducer and a data processing circuit, an electrical conductivity measuring device composed of an alternating current source and a ring electrode, a temperature measuring circuit composed of an NTC thermistor and a data processing circuit, a clock system, a data storage system, a power supply circuit and an attitude sensor.

[0038] As shown in Figure 5 The marine sediment thermoelectric acoustic detection device described in the present application includes an electronic cabin 1 with a built-in communication module, a transfer port is arranged at the bottom of the electronic cabin 1, and a transfer piece 2 is welded to the transfer port;

[0039] The transfer piece 2 is communicated with a transverse pipe 3 on one side, the transverse pipe 3 is a cylindrical steel pipe with a length of 10cm, an outer diameter of 10mm and an inner diameter of 6mm, the transverse pipe 3 is connected with a transmitting transducer 4 at the end, and the transmitting transducer 4 and the connected transverse pipe 3 form an angle of 135°;

[0040] A group of first connecting pieces 5 are communicated with the bottom of the transfer piece 2, the first connecting pieces 5 are steel pipes with an outer diameter of 16mm, and the inner diameter is provided with threads, and the length of the first connecting pieces 5 is 50mm;

[0041] The detection device includes three groups of first connecting pieces 5, and a group of underwater acoustic transducers 6 is connected between adjacent two groups of first connecting pieces 5;

[0042] As shown in Figure 7 and Figure 8 The underwater acoustic transducer 6 has a second connecting piece 13 as an inner core, a protective layer covering the outer periphery of the second connecting piece 13, the length of the second connecting piece 13 is greater than the diameter of the protective layer, and the outer diameter of the exposed part of the second connecting piece 13 is provided with threads for connecting the inner diameter of the first connecting piece 5;

[0043] The protective layer comprises a backing 14 of acrylic material at the outermost layer, a PVDF film 16 attached to the inner layer of the backing 14, and an epoxy resin layer 15 filled between the outer diameter of the second connecting member 13 and the backing 14 and the PVDF film 16.

[0044] Before the epoxy resin layer 15 is filled, the circuit connecting line 12 drawn from the electronic cabin 1 is first connected to the PVDF film 16.

[0045] To realize the drawing of the lead from the second connecting member 13, a through slot 11 is provided on the side wall of the second connecting member 13.

[0046] As shown in Figure 9 the PVDF film 16 has a rectangular structure with a length of 50 mm and a width of 30 mm. Before the conductive silver glue is applied to the PVDF, the required shape is cut according to the determined size, the through holes 17 on the left and right sides are used, the rivet is pressed to shape, and finally the circuit connecting line 12 is drawn therefrom.

[0047] As shown in Figure 10 the conductive silver glue layer 19 is applied to the two sides of the PVDF film 16 by silk screen printing. The shaded part in the figure is the conductive silver glue layer 19.

[0048] Four groups of conductivity measuring copper rings 8 are connected in series at the bottom of the third group of first connecting members 5. A group of third connecting members 9 is connected to the bottom of the last group of conductivity measuring copper rings 8 between the two adjacent groups of conductivity measuring copper rings 8.

[0049] As shown in Figures 11 to 13 the third connecting member 9 is a steel member, which comprises an inner part 90 and an outer part 91 connected by internal and external threads. The inner part 90 is provided with a through slot 11 along its radial direction.

[0050] Each group of conductivity measuring copper rings 8 is connected to the circuit connecting line 12 by soldering. The circuit connecting line 12 is drawn from the through slot 11 of the third connecting member 9, and then the conductivity measuring copper ring 8 is sleeved from top to bottom along the inner part 90 of the third connecting member 9. In order to prevent short circuit caused by direct contact between the conductivity measuring copper ring 8 and the third connecting member 9, a rubber pad 92 is provided between the step of the conductivity measuring copper ring 8 and the outer part 91.

[0051] Further, after the assembly is completed according to the above steps, an insulating polyurethane layer is coated on the outer peripheral surface of the outer part 91 of the third connecting member 9 (the conductivity measuring copper ring 8 is not coated).

[0052] The last group of third connecting members 9 is connected to the fourth connecting member 10, which has an overall structure with external threads at the top and a solid conical bottom.

[0053] In summary, the marine sediment thermoelectric acoustic detection device comprises an electronic cabin 1 and a hollow probe rod structure sequentially connected from the adapter 2 to the fourth connecting piece 10, and a plurality of groups of NTC thermistors 7 are equidistantly arranged in the probe rod structure; after assembling the NTC thermistors 7, the probe rod inside from the adapter 2 to the fourth connecting piece 10 is filled with epoxy resin.

[0054] As described above, the content of the scheme given in combination with the drawings and the description can derive similar technical solutions. Any scheme content that does not deviate from the structure of the present application still belongs to the scope of the technical solutions of the present application.

Claims

1. A marine sedimental thermoacoustic probe device, characterized by: The electronic cabin comprises a built-in communication module, The adapter is welded at the bottom of the electronic cabin; The adapter is connected with a transverse pipe at one side, and the transverse pipe is connected with a transmitting transducer at the end; The bottom of the adapter is connected with a group of first connecting members, and the inner diameter of the first connecting members is provided with threads; A group of first connecting members are arranged, and a group of underwater acoustic transducers are connected between two adjacent groups of first connecting members; A group of copper rings for measuring conductivity are connected in series at the bottom of the last group of first connecting members, and a group of third connecting members are connected between two adjacent groups of copper rings for measuring conductivity and at the bottom of the last group of copper rings for measuring conductivity; The third connecting members of the last group are connected with fourth connecting members, and the fourth connecting members have an overall structure with external threads at the top and a solid conical bottom; The hollow probe rod structure is sequentially connected from the adapter to the fourth connecting members, and a plurality of groups of NTC thermistors are equidistantly arranged in the probe rod structure; and epoxy resin is filled in the probe rod from the adapter to the fourth connecting members after the NTC thermistors are assembled.

2. The apparatus of claim 1, wherein: The transmitting transducer and the connected transverse pipe form an angle of 100° to 150°.

3. The apparatus of claim 1, wherein: The underwater acoustic transducer has a second connecting member as an inner core, a protective layer wrapped around the outer periphery of the second connecting member, the length of the second connecting member being greater than the length of the protective layer, and threads for connecting the inner diameter of the first connecting members being arranged on the outer diameter of the exposed part of the second connecting member; The protective layer comprises a backing of acrylic material at the outermost layer, a layer of PVDF film attached to the inner layer of the backing, and an epoxy resin layer filled between the outer diameter of the second connecting member and the backing and the PVDF film.

4. The apparatus of claim 1, wherein: The underwater acoustic transducer is provided with a through groove on the side wall of the second connecting member before the epoxy resin layer is filled, and the circuit connecting line drawn from the electronic cabin is first connected to the PVDF film.

5. The apparatus of claim 4, wherein: The PVDF film has through holes at the left and right sides, and the circuit connecting line is drawn from the through holes after being pressed and shaped by rivets; The left and right sides of the PVDF film are respectively coated with a conductive silver adhesive layer by screen printing.

6. The apparatus of claim 1, wherein: The third connecting member comprises an inner part and an outer part connected by internal and external threads, and the inner part is provided with a through groove along the radial direction; The copper ring for measuring conductivity is connected to the circuit connecting line by soldering, and the circuit connecting line is drawn from the through groove, and then the copper ring for measuring conductivity is sleeved on the inner part of the third connecting member from top to bottom; A rubber pad is arranged between the copper ring for measuring conductivity and the step of the outer part; After the assembly is completed according to the above steps, an insulating polyurethane layer is coated on the outer peripheral surface of the outer part of the third connecting member.

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