WO2021227605A1

WO2021227605A1 - Rov-based in-situ detection system and method for acoustic parameters of deep sea sediment

Info

Publication number: WO2021227605A1
Application number: PCT/CN2021/078578
Authority: WO
Inventors: 栾振东; 郭常升; 连超; 宋永东; 张建兴; 张鑫; 王诗文; 阎军
Original assignee: 中国科学院海洋研究所
Priority date: 2020-05-13
Filing date: 2021-03-02
Publication date: 2021-11-18
Also published as: CN111595611A; CN111595611B

Abstract

An ROV-based in-situ detection system and method for acoustic parameters of a deep sea sediment. The detection system comprises a detection and collection system and a communication control system. The detection and collection system is used for synchronous in-situ real-time measurement of acoustic parameters, detection of a deep sea temperature gradient and collection of a deep sea sediment sample. The acoustic parameters measured in-situ comprise the sound velocity and sound attenuation of sediment. The communication control system is used for controlling the detection and collection system to act and receiving data collected by the detection and collection system. The device has the advantages of having a small and compact structure, high pressure resistance and corrosion resistance, being easy to operate and having a high positioning precision. A working state may be monitored in real time, and on the basis of a bathyscaphe platform, the system works flexibly and stably and may quickly and effectively obtain geological samples and measurement data.

Description

ROV-based system and method for in-situ detection of acoustic parameters of deep-sea sediments

Technical field

The invention belongs to the field of marine parameter measurement equipment, and specifically is an ROV-based in-situ detection system and method for acoustic parameters of deep-sea sediments.

Background technique

As ocean rights and scientific investigations continue to deepen ocean research, the research on the acoustic properties of seabed sediments has become an important research topic at present. The sound field analysis of the sound velocity and sound attenuation coefficient of the seabed sediments, the permeability of the water interface near the seabed, the temperature field changes of the seabed sediments, the fluid velocity and other physical parameters (temperature, salinity and pressure), and the physical and chemical environment of the sediments are important for military oceans. Science, engineering geological prospecting, and marine geoscience research are all of great significance. According to the different operation methods, there are two main methods for measuring the acoustic properties and related physical parameters of sediments, namely sampling measurement and seafloor in-situ measurement. Since sampling for laboratory measurement requires first to obtain seabed sediment through a gravity sampler or a box sampler, this will bring about measurement errors caused by structural disturbances of the sediments and changes in the temperature and pressure of the environment where the sediments are located; Compared with in-situ measurements on the seabed, unpredictable errors caused by disturbances during sampling and sample handling are avoided. The reported in-situ measurement systems mainly include the sediment acoustic field measurement system ISSAMS developed by the U.S. Navy, the acoustic lance Acoustic Lance developed by the University of Hawaii, and the seabed sediment jointly developed by the Southampton Ocean Center and the British Geotek Company. The acoustic and geotechnical properties in-situ measurement system SAPPA, etc., lack the multi-point temperature in-situ measurement, and it is difficult to analyze the influence of temperature on the acoustic properties of sediments.

To sum up, the existing in-situ measurement systems at home and abroad all use ship-borne winch station position measurement, and station position measurement requires one or more instrument deployment and recovery operations at each station, which is cumbersome and easy to destroy the original The environment and state of the sedimentary strata, and it is equipped with a single acoustic detector for sound velocity measurement, and it is impossible to carry out the simultaneous comprehensive measurement of the acoustic parameters of sediments and related physical properties. Based on the needs of scientific research, the present invention constructs an in-situ real-time comprehensive detection device for the acoustic parameters of deep-sea sediments based on deep submersibles. When the equipment is inserted into the sediments, the disturbance of the sediments is small, and the relevant physical parameters such as the acoustic parameters and temperature of the sediments are obtained synchronously. It has obvious advantages over previous equipment. Therefore, based on the flexibility of the deep submersible floating near the seabed, a near-seabed hydraulic propulsion measurement equipment with the deep submersible as a platform can be developed, which can not only reduce the lifting and decentralization of the instrument, improve the efficiency of the measurement work, but also It can continuously work at multiple points to ensure the authenticity and high precision of the data.

Summary of the invention

The purpose of the present invention is to provide a ROV-based fixed device for the acquisition, recording, storage and export of the acoustic parameters of deep sea sediments and related physical property parameters, which can comprehensively detect the acoustic properties of deep-sea shallow sediments and related physical property parameters In order to overcome the shortcomings of the above-mentioned traditional in-situ detection and acquisition devices for the acoustic parameters of deep-sea sediments.

The technical solution adopted by the present invention to achieve the above-mentioned purpose is: an ROV-based in-situ detection device for acoustic parameters of deep-sea sediments, including a detection acquisition system and a communication control system;

The detection and acquisition system is used to synchronize the in-situ real-time measurement of acoustic parameters, the detection of deep-sea temperature gradients, and the collection of deep-sea sediment samples; the in-situ acoustic parameters include sediment sound velocity and sound attenuation;

The communication control system is used to control the action of the detection collection system and to receive the data collected by the detection collection system.

The detection collection system includes a shallow surface sediment sampling device, a device support, a receiving transducer mounting column, a receiving transducer, a transmitting transducer, a mounting tray, a gradient temperature detection device, and a driving cylinder device;

The device support is provided with a mounting tray that can move up and down; the emission transducer is mounted on the lower surface of the mounting tray; the drive cylinder device is located above the device support, and the drive cylinder device is connected to the device through a cylinder rod piston. The upper surface of the tray is connected, so that the cylinder rod piston drives the mounting tray to move up and down;

The device holder is provided with a receiving transducer mounting column and a shallow surface sediment sampling device, and the top of the shallow surface sediment sampling device and the top of the receiving transducer mounting column are connected to the mounting tray; the receiving transducer The side wall surface of the installation column is connected with the side wall surface of the shallow surface sediment sampling device, and the receiving transducer is installed on the receiving transducer installation column;

The top of the gradient temperature detection device is arranged above the installation tray, and the temperature probe of the gradient temperature detection device passes through the installation tray and is fixedly connected with the installation bracket fixed on the surface of the side wall of the shallow sediment sampling device.

The side wall surface of the mounting post of the receiving transducer and the side wall surface of the shallow surface sediment sampling device are cut outside.

The mounting post of the receiving transducer is provided with a plurality of mounting holes, and the receiving transducer is arranged in the mounting hole, and the distance between any two adjacent receiving transducers is fixed in the vertical direction.

The device support is a two-layer support structure, including a support column, a support top plate, and a water interface pressure plate parallel to the support top plate; one end of the support column is fixedly connected to the support top plate, and the other end is fixed to the water interface tray. The supporting column is slidably connected to the mounting tray; the top plate of the support and the water interface pressure plate are provided with through holes for the gradient temperature detection device, the shallow sediment sampling device and the transducer mounting column.

The shallow surface sediment sampling device includes a device top cover, a connecting pipe, a sampling knife head, a sampling liner, and a sealing mechanism;

One end of the sampling liner is connected to the sampling cutter head through a connecting pipe, and the other end is connected to the device top cover; the device top cover is provided with a plurality of drainage holes, and the device top cover is provided with a sealing mechanism;

The connecting pipe is provided with a plurality of through holes, and the sampling cutter head is connected with a cylindrical pin arranged in the through hole.

The sampling cutter head has a hollow structure, the lower part is in the shape of a frustum, and the upper part is in the shape of a cylinder. The lower end of the frustum is a cutting edge. Sleeve into the connecting pipe, and the strip hole corresponds to the through hole on the connecting pipe;

A number of knives are arranged inside the junction of the frustum and the cylinder, each of which includes a blade and a connecting piece; the connecting piece has two plates, and the first connecting plate is inserted in the strip hole and is hinged to the connecting pipe , The blade is fixedly connected to the second connecting plate of the connector, and the blade is triangular or fan-shaped; the angle between the two plates of the connector is an obtuse angle, and a protrusion is formed at the junction of the two plates.

The sealing mechanism includes a threaded rod, a sampling handle, a nylon block, a pressure plate A and a pressure plate B;

The threaded rod passes through the nylon block, the pressure plate A, and the pressure plate B in sequence and is threadedly connected with the top cover of the device;

The threaded rod between the top cover of the device and the pressure plate A is covered with a spring, and one end of the spring supports the pressure plate A, and the other end of the spring passes through the pressure plate B and abuts against the top cover of the device;

The sampling handle passes through the nylon block and abuts against the pressure plate A.

The sampling handle is a U-shaped tube, and the rods at both ends of the sampling handle are symmetrically arranged along the center of the nylon block.

The ROV-based in-situ detection method for acoustic parameters of deep-sea sediments is characterized in that it includes the following steps:

1) Start the drive cylinder device, drive hydraulically through hydraulic pumping, and push the cylinder rod to drive the superficial sediment sampling device connected with the piston to insert the sediment;

2) Sampling during the insertion process of the shallow sediment sampling device: the cutting edge of the sampling cutter inserts the sediment to push the sediment relative to the sampling cutter, and then the cutter rotates upwards, and the sediment enters the sampling cutter to make sampling The water in the liner is drained from the drainage hole on the top cover of the device;

3) The detection and acquisition system measures the sediment gradient temperature, sound velocity, and sound attenuation and acquires data;

4) When the sealing mechanism of the shallow sediment sampling device is subjected to downward external force, the sealing mechanism blocks the drainage hole; the oil cylinder device drives the shallow sediment sampling device to lift, and the sediment in the shallow sediment sampling device Press down the tool to rotate the tool downwards until the tool closes to support the deposit;

5) The communication control system exports the measured data to complete the in-situ detection of the acoustic parameters of deep-sea sediments.

The present invention has the following beneficial effects and advantages:

1. The invention has a small and compact structure, strong compression resistance and corrosion resistance, easy operation, and high positioning accuracy;

2. The present invention has the function of real-time in-situ measurement, is suitable for complex seabed environments with various depths, temperatures and pressures, and can be widely used in scientific tasks that require strict fidelity geological sampling and in-situ measurement;

3. The present invention can monitor the working status in real time. Based on the deep submersible platform, it has flexible and stable work, and can quickly and effectively obtain geological samples and measurement data;

4. The shallow surface sediment sampling device of the present invention has a simple structure at the sampling cutter head that can be opened and closed according to external force, and it naturally rotates downward when being lifted up to hold the sediment. The working principle is simple. The shallow surface sediment sampling device The waterproof performance is high, and the sealing mechanism prevents seawater from entering the sampling liner in multiple ways.

Description of the drawings

Figure 1 The system block diagram of the present invention;

Figure 2 Schematic diagram of the structure of the present invention;

Among them, 1 is the shallow surface sediment sampling device, 2 is the device support, 3 is the receiving transducer mounting post, 4 is the receiving transducer, 5 is the transmitting transducer, 6 is the mounting tray, and 7 is the gradient temperature detection device , 8 is the mounting bracket, 9 is the drive cylinder device, 201 is the water interface pressure plate, 202 is the support column, and 203 is the top plate of the bracket;

Fig. 3 is a schematic diagram of the structure of the shallow sediment sampling device of the present invention;

Among them, 101 is the sampling handle, 102 is the nylon block, 103 is the pressure plate A, 104 is the pressure plate B, 105 is the top cover of the device, 106 is the sampling liner, 107 is the connecting pipe, 108 is the sampling cutter head, and 109 is Spring, 110 is a threaded rod;

Fig. 4 is a schematic diagram of the structure of the sampling cutter head of the present invention;

Figure 5 Schematic diagram of the cutter structure of the present invention;

Among them, 1081 is a blade, 1082 is a first connecting plate, 1083 is a second connecting plate, and 1084 is a protrusion.

Detailed ways

The present invention will be further described in detail below in conjunction with the drawings and embodiments.

The present invention will be described in further detail below with reference to the accompanying drawings.

As shown in Figure 1, it is a system block diagram of the present invention. The ROV-based in-situ detection system for acoustic parameters of deep-sea sediments is characterized in that it includes a detection acquisition system and a communication control system;

Detection and acquisition system for real-time measurement of synchronous acoustic parameters in-situ, detection of deep-sea temperature gradients, and collection of deep-sea sediment samples; the in-situ acoustic parameters include sediment sound velocity and sound attenuation;

The power supply system converts the high-voltage DC/AC power transmitted by the shore-based submersible through the deep submersible into 48V, 24V, 12V and other DC power that can be used by scientific instruments;

The storage system completes system parameter configuration, working mode control, online collection, data presentation, storage, and processing functions.

As shown in Figure 2, which is a schematic diagram of the structure of the present invention, the detection and acquisition system includes a shallow surface sediment sampling device 1, a device support 2, a receiving transducer mounting column 3, a receiving transducer 4, and a transmitting transducer 5. Install the tray 6, the gradient temperature detection device 7 and the drive cylinder device 9;

The device support 2 is provided with a mounting tray 6 that can move up and down; the transmitting transducer 5 is mounted on the lower surface of the mounting tray 6; the drive cylinder device 9 is located above the device support 2, and the drive cylinder device 9 is connected with the piston through the cylinder rod. The upper surface of the mounting tray 6 is connected so that the cylinder rod piston drives the mounting tray 6 to move up and down;

The device holder 2 is provided with a receiving transducer mounting column 3 and a shallow surface sediment sampling device 1. The top of the shallow surface sediment sampling device 1 and the top of the receiving transducer mounting column 1 are connected to the mounting tray 6; the receiving transducer The side wall surface of the mounting column 3 is connected with the side wall surface of the shallow surface sediment sampling device 1, the receiving transducer 4 is installed on the receiving transducer mounting column 3, and the receiving transducer mounting column 3 is arranged on the transmitting transducer 5. On the mounting tray 6 on one side, the transmitting transducer 5 emits sound wave signals, and the receiving transducer 4 receives the signals, and measures the sound velocity and sound attenuation of the sediment.

The deep-sea temperature gradient detection device 7 is composed of a temperature sensor, a deep-sea temperature gradient detection probe and a mounting bracket 8;

The top of the gradient temperature detection device 7 is arranged above the installation tray 6, the temperature probe of the gradient temperature detection device 7 penetrates the installation tray 6 and is fixedly connected to the installation bracket 8 fixed on the surface of the side wall of the shallow sediment sampling device 1.

The side wall surface of the receiving transducer mounting column 3 is cut out of the side wall surface of the shallow sediment sampling device 1.

The mounting post 3 of the receiving transducer is provided with a plurality of mounting holes, and the mounting hole is provided with the receiving transducer 4, and the distance between any two adjacent receiving transducers 4 in the vertical direction is fixed.

The device support 2 is a two-layer support structure, including a support column 202, a support top plate 203, and a water interface pressure plate 201 parallel to the support top plate; one end of the support column 202 is fixedly connected to the support top plate 203, and the other end is connected to the water interface The tray 201 is fixedly connected; the support column 202 is slidably connected to the mounting tray 6; the top plate 203 of the support and the water interface pressure plate 201 are both equipped with a gradient temperature detection device 7, a shallow sediment sampling device 1 and a transducer mounting column 3 detection device Out of the through hole.

The driving cylinder device 9 uses the driving cylinder as the power source to push the cylinder rod to complete the movement of the sealed piston. The back end cover of the sealed piston is connected with the mounting tray 6 to push the entire set of sediment acoustic parameters in-situ comprehensive detection device to operate, and to insert the sediment simultaneously In-situ measurements are performed in the process. The installation support column 202 is composed of 4 stainless steel columns, and the upper and lower sides are respectively connected by the support top plate 203 and the water interface pressure plate 201 to form a two-layer cube support for fixing the measuring device.

Based on the ROV body installation, the cylinder drive is hydraulically driven by hydraulic drainage, which is stable and simple.

The device support of the present invention can also be connected to a variety of detection instruments, such as ocean profile wave sensors, deep-sea in-situ laser Raman spectroscopy quantitative detection devices and the like.

In order to complete the in-situ comprehensive detection of acoustic parameters of deep-sea sediments using the deep-sea vehicle, the present invention needs to complete several steps: 1. Site selection; 2. The deep-sea vehicle dives into position; 3. In-situ measurement data acquisition; 4. Recovery of detection equipment.

In the first step, the seabed detection capability of the scientific research ship is used to conduct seabed topography and shallow profile measurement of the area to be measured, preliminarily determine the range and thickness of the sediment, and determine the detection site for the acoustic parameters of the sediment.

After that, the scientific research ship is positioned, and the step 2 ROV dive operation is performed. After the ROV dives to the predetermined operating station, the surface of the seabed sediment contacts the water interface pressure plate 201 of the device, and the ROV body stays stable. , The in-situ comprehensive detection device for acoustic parameters of sediments is provided by the drive cylinder 9 to provide the hydraulic oil circuit, and the sealed piston is driven forward by the cylinder rod, and the shallow surface sediment sampling device 1, the receiving transducer mounting column 3, the receiving transducer in the through hole The device 4 and the gradient temperature detection device 7 are inserted into the sediment to reach the set depth without disturbance, and the system collection parameters are set through the real-time communication control system, including signal transmission and reception frequency, sampling rate, sampling mode, recording time, and data format Wait, start measuring to obtain data after meeting the measurement conditions;

Perform step 3 to obtain the parameters. After completing the parameter collection, proceed to step 4, drive the cylinder device 9 to reciprocate, pull out the sediment with the probe together with the sampling device, and use ROV to recover it to the deck to export and convert the data to complete the deep-sea sediment Comprehensive in-situ detection of acoustic parameters.

Figure 3 is a schematic diagram of the structure of the shallow surface sediment sampling device of the present invention, and the top cover of the device is provided with a sealing mechanism;

The shallow sediment sampling device includes a device top cover 105, a connecting pipe 107, a sampling cutter head 108, a sampling liner 106 and a sealing mechanism;

One end of the sampling liner 106 is connected to the sampling cutter head 108 through the connecting pipe 107, and the other end is connected to the device top cover 105; the device top cover 105 is provided with a plurality of drainage holes, and the device top cover 105 is provided with a sealing mechanism.

The connecting pipe 107 is provided with a plurality of through holes, and the sampling cutter head 108 is connected with a cylindrical pin provided in the through hole of the connecting pipe 107.

As shown in Figures 4 to 5, it is a schematic diagram of the structure of the sampling cutter head and the cutter. The sampling cutter head 108 has a hollow structure, the lower part is in the shape of a truncated cone, and the upper part is cylindrical. The lower end of the frustum is a cutting edge, and the cylindrical side The wall is evenly provided with a plurality of strip holes along the circumferential direction, the cylindrical upper part is sleeved in the connecting pipe, and the strip holes correspond to the through holes on the connecting pipe;

A plurality of knives are arranged inside the junction of the frustum and the cylinder, each tool includes a blade 1081 and a connecting piece; the connecting piece has two plates, and the first connecting plate 1082 is inserted in the strip hole and connected with The tube is hinged, and the blade is fixed on the second connecting plate 1083 of the connector. The blade is triangular or fan-shaped; the angle between the two plates of the connector is an obtuse angle, and a protrusion 1084 is formed at the junction of the two plates.

During the insertion process of the shallow sediment sampling device 1, drain excess water through the drainage hole, and complete sampling and storage of the sediment through the sampling liner 106;

When the sampling device is lifted up, the sample in the cylinder presses down the cutter and rotates the cutter downward until the protrusion 1084 on the connecting piece abuts against the cylindrical upper part, and each blade supports the sample.

As shown in the partial schematic diagram of the sealing mechanism in Figure 2, the sealing mechanism includes a threaded rod 110, a sampling handle 101, a nylon block 102, a pressure plate A103 and a pressure plate B104; the sealing device of the present invention can be installed in two ways:

Embodiment 1: The device top cover 105 is provided with a threaded rod 110, and the threaded rod 110 is provided with a nylon block 102. The threaded rod 110 passes through the nylon block 102, the pressure plate A103, and the pressure plate B104 in turn to be threadedly connected to the device top cover 105;

The threaded rod 110 between the device top cover 105 and the pressure plate A103 is covered with a spring 109, and one end of the spring 109 supports the pressure plate A103 so that the pressure plate A 103 will not fall naturally to prevent the drain hole from being blocked. The other end of the spring 109 penetrates Over-dense pressure plate 104, one turn of the spring 109 passes through the pressure plate 104, so that the pressure plate B 104 moves up and down with the tension of the spring, and abuts against the top cover 105 of the device;

The sampling handle passes through the nylon block 102 and abuts against the pressure plate A103.

When the shallow surface sediment sampling device is inserted, because the pressure plate B 104 moves upward with the tension of the spring, the pressure plate A 103 is resisted by the spring 109 and will not fall naturally. After the insertion is completed, the sampling liner 106 is inserted. The collected sediment squeezes the water in the sampling liner 106 from the drainage hole to complete the sealing; the present invention ensures the secondary sealing of the collected sediment, which increases the accuracy and multi-directional sediment sampling Security of protection;

The present invention is located under the submersible, and the real-time communication control system can be used to control the manipulator provided on the submersible. Before sampling is completed and ready to be lifted, the sampling handle 101 is knocked, and the nylon block 102 is fixed by the stud 110. The sampling handle 101 passes through the nylon block 102 to push the pressure plate A 103, and the pressure plate A 103 continues to be transferred to the pressure plate B 104 to realize the drainage hole plugging function. The upper elastic force of the spring 109 is less than that between the sampling handle 101 and the nylon block 102 The friction force makes the pressure plate tightly adhere to the top cover 105 of the device.

Embodiment 2: The device top cover 105 is provided with a threaded rod 110, and the threaded rod 110 is provided with a nylon block 102. The threaded rod 110 passes through the nylon block 102, the pressure plate A 103, the pressure plate B 104 and the device top cover 105 in turn. connect;

The threaded rod 110 between the device top cover 105 and the pressure plate B 104 is covered with a spring 109, so that one end of the spring 109 supports the pressure plate B 104, so that the pressure plate B 104 does not fall naturally and abuts against the device top cover 105;

The sampling handle passes through the nylon block 102 and is firmly connected to the pressure plate A 103, and the sampling handle drives the pressure plate A 103 to move up and down.

Before sampling is finished and ready to be lifted, tap the sampling handle 101, the nylon block 102 is fixed by the stud 110, the sampling handle 101 passes through the nylon block 102 and presses down with the connected pressure plate A 103, and the pressure plate A 103 continues The upper elastic force of the spring 109 is less than the friction between the sampling handle 101 and the nylon block 102, so that the pressure plate is tightly attached to the top cover 105 of the device.

The pressure plate A103 is a circular plate made of metal, and the pressure plate B104 is a circular plate made of rubber.

The sampling handle 101 is a U-shaped tube, and the rods at both ends of the sampling handle 101 are symmetrically arranged along the center of the nylon block 102. The rods at both ends of the sampling handle 101 are of equal length and pass through the nylon block, and a point on the center line of the sampling handle 101 and the nylon block 102 is on a straight line.

The ROV-based detection method of the in-situ detection system for the acoustic parameters of deep-sea sediments is characterized in that it includes the following steps:

1) Start the drive cylinder device 9, hydraulically driven by hydraulic pumping, and push the cylinder rod to drive the shallow sediment sampling device connected with the piston to insert the sediment; the deep-sea temperature gradient detection device 7, including temperature sensors, deep-sea Temperature gradient detection probe and mounting bracket 8. The whole set of device is connected and fixed together by the mounting tray 6 and the support cylinder 202, installed on the ROV and other deep submersible body, and the driving power is provided by the driving cylinder device 9, and it is inserted into the sediment simultaneously without disturbance, and the in-situ measurement is performed after the insertion is completed. ；

2) Sampling is carried out during the insertion process of the shallow sediment sampling device 1: the cutting edge of the sampling cutter head 108 is inserted into the sediment to push the sediment relative to the sampling cutter head 108, and then the cutter is rotated upwards and enters the sampling cutter head 108. The sediment causes the water in the sampling liner 106 to drain from the drainage hole on the top cover 105 of the device;

3) The detection acquisition system measures the sediment gradient temperature, sound velocity, and sound attenuation and acquires data; sets the system acquisition parameters through the communication control system, sets the transmitting transducer 5 to emit sound waves, and makes the receiving transducer 4 receive sound waves and measure The parameters of the sound velocity and sound attenuation of the sediment are obtained, and the temperature sensor on the gradient temperature detection device 7 starts to detect temperature data of different gradients through the multi-point detection probe.

4) When the sealing mechanism of the shallow sediment sampling device 1 is subjected to downward external force, the sealing mechanism blocks the drainage hole; the oil cylinder device 9 drives the shallow sediment sampling device 1 to lift, and the shallow sediment sampling device 1 The deposit inside presses down the cutter to rotate the cutter downward until the cutter supports the deposit;

5) Using the reciprocating function of the drive cylinder 9, the measurement and detection part together with the shallow surface sediment sampling device 1 is slowly pulled out of the sediment, and recovered to the deck together with the ROV body, and the communication control system exports the measured data to complete the deep sea In-situ detection of sediment acoustic parameters.

Claims

The ROV-based in-situ detection system for the acoustic parameters of deep-sea sediments is characterized in that it includes a detection acquisition system and a communication control system;

The detection and acquisition system is used to synchronize the in-situ real-time measurement of acoustic parameters, the detection of deep-sea temperature gradients, and the collection of deep-sea sediment samples; the in-situ acoustic parameters include sediment sound velocity and sound attenuation;

The communication control system is used to control the action of the detection collection system and to receive the data collected by the detection collection system.
The ROV-based in-situ detection system for acoustic parameters of deep-sea sediments according to claim 1, wherein the detection acquisition system includes a shallow sediment sampling device (1), a device support (2), and a receiving transducer Mounting post (3), receiving transducer (4), transmitting transducer (5), mounting tray (6), gradient temperature detection device (7) and driving cylinder device (9);

The device support (2) is provided with a mounting tray (6) that can be displaced up and down; the transmitting transducer (5) is mounted on the lower surface of the mounting tray (6); the drive cylinder device (9) is mounted on Above the device support (2), the drive cylinder device (9) is connected to the upper surface of the mounting tray (6) through the cylinder rod piston, so that the cylinder rod piston drives the mounting tray (6) to move up and down;

The device holder (2) is provided with a receiving transducer mounting column (3) and a shallow surface sediment sampling device (1), and the top of the shallow surface sediment sampling device (1) and the receiving transducer mounting column ( The top of 1) is connected to the mounting tray (6); the side wall surface of the receiving transducer mounting column (3) is connected to the side wall surface of the shallow sediment sampling device (1), and the receiving transducer (4) ) Is installed on the mounting post (3) of the receiving transducer;

The top of the gradient temperature detection device (7) is arranged above the installation tray (6), and the temperature probe of the gradient temperature detection device (7) passes through the installation tray (6) and is fixed to the shallow sediment sampling device (1). ) The mounting bracket (8) on the surface of the side wall is fixedly connected.
The ROV-based in-situ detection system for acoustic parameters of deep-sea sediments according to claim 2, characterized in that the side wall surface of the receiving transducer mounting column (3) and the side wall surface of the shallow sediment sampling device (1) Outside.
The ROV-based in-situ detection system for acoustic parameters of deep-sea sediments according to claim 2, wherein the receiving transducer mounting post (3) is provided with a plurality of mounting holes, and the mounting holes are provided with For the receiving transducer (4), the distance between any two adjacent receiving transducers (4) in the vertical direction is fixed.
The ROV-based in-situ detection system for acoustic parameters of deep-sea sediments according to claim 2, wherein the device support (2) is a two-layer support structure, including a support column (202) and a support top plate (203). ), and a water interface pressure plate (201) parallel to the top plate of the support; one end of the support column (202) is fixedly connected to the support top plate (203), and the other end is fixedly connected to the water interface tray (201); the support The column (202) is slidably connected with the mounting tray (6); the top plate (203) of the support and the water interface pressure plate (201) are both equipped with a gradient temperature detection device (7) and a shallow sediment sampling device (1) And the through hole protruding from the transducer mounting post (3).
The ROV-based in-situ detection system for acoustic parameters of deep-sea sediments according to claim 2, wherein the shallow sediment sampling device includes a device top cover (105), a connecting pipe (107), and a sampling cutter head ( 108), sampling liner (106) and sealing mechanism;

One end of the sampling liner (106) is connected to the sampling cutter head (108) through a connecting pipe (107), and the other end is connected to the device top cover (105); the device top cover (105) is provided with a plurality of drainage holes , A sealing mechanism is provided on the top cover (105) of the device;

The connecting pipe (107) is provided with a plurality of through holes, and the sampling cutter head (108) is connected with a cylindrical pin arranged in the through hole.
The ROV-based in-situ detection system for acoustic parameters of deep-sea sediments according to claim 6, characterized in that the sampling cutter head (108) has a hollow structure, the lower part is in the shape of a frustum, and the upper part is in the shape of a cylinder. The lower end is a cutting edge, the cylindrical side wall is evenly provided with a plurality of strip holes along the circumferential direction, the upper part of the cylindrical shape is sleeved in the connecting pipe, and the strip holes correspond to the through holes on the connecting pipe;

A number of knives are provided inside the junction of the frustum and the cylinder, each tool includes a blade (1081) and a connecting piece; the connecting piece has two plates, and the first connecting plate (1082) is inserted in the strip hole , And hinged with the connecting pipe, the blade is fixed on the second connecting plate (1083) of the connecting piece, the blade is triangular or fan-shaped; the angle between the two plates of the connecting piece is an obtuse angle, and a protrusion is formed at the junction of the two plates (1084).
The ROV-based in-situ detection system for acoustic parameters of deep-sea sediments according to claim 6, wherein the sealing mechanism includes a threaded rod (110), a sampling handle (101), a nylon block (102), and a pressure plate A (103) and pressure plate B (104);

The threaded rod (110) passes through the nylon block (102), the pressure plate A (103), and the pressure plate B (104) in order to be threadedly connected with the device top cover (105);

The threaded rod (110) between the device top cover (105) and the pressure plate A (103) is covered with a spring (109), and one end of the spring (109) supports the pressure plate A (103), and the other end of the spring (109) Pass through the pressure plate B (104) and abut the top cover (105) of the device;

The sampling handle passes through the nylon block (102) and abuts against the pressure plate A (103).
The ROV-based in-situ detection system for acoustic parameters of deep-sea sediments according to claim 8, wherein the sampling handle (101) is a U-shaped tube, and the two ends of the sampling handle are along the nylon block ( 102) The center of the circle is set symmetrically.
The detection method of the ROV-based in-situ detection system for acoustic parameters of deep-sea sediments according to claims 1-9, characterized in that it comprises the following steps:

1) Start the drive cylinder device (9), drive hydraulically through hydraulic pumping, and push the cylinder rod to drive the superficial sediment sampling device (1) connected with the piston to insert the sediment;

2) Sampling during the insertion process of the shallow sediment sampling device (1): the cutting edge of the sampling cutter head (108) is inserted into the sediment so that the sediment is pushed up relative to the sampling cutter head (108), and the cutter is rotated upwards, The sediment entering the sampling cutter head (108) causes the water in the sampling liner (106) to drain from the drainage hole on the top cover (105) of the device;

3) The detection and acquisition system measures the sediment gradient temperature, sound velocity, and sound attenuation and acquires data;

4) When the sealing mechanism of the shallow sediment sampling device (1) is subjected to a downward external force, the sealing mechanism blocks the drainage hole; the oil cylinder device (9) drives the shallow sediment sampling device (1) to lift up, shallow The sediment in the surface sediment sampling device (1) presses down the cutter to rotate the cutter downward until the cutter supports the sediment;

5) The communication control system exports the measured data to complete the in-situ detection of the acoustic parameters of deep-sea sediments.