CN114152773A - Two-dimensional sea surface ghost wave water body imaging measurement device, method and application - Google Patents
Two-dimensional sea surface ghost wave water body imaging measurement device, method and application Download PDFInfo
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- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
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Abstract
The invention belongs to the technical field of marine exploration and discloses a two-dimensional sea surface ghost wave water body imaging measurement device, a method and application, wherein a vertical cable in the two-dimensional sea surface ghost wave water body imaging measurement device is arranged in the vertical direction, and the lower end of the vertical cable is connected with a digital packet; the upper end of the vertical cable is connected with a floating ball, the ADCP is arranged above the floating ball, and the strong energy absorption plate is placed on the sea surface above the ADCP. The upper part of the digital packet is provided with an attitude sensor, a temperature sensor, a GPS and a pressure sensor; and the middle of the digital packet is provided with an earthquake acquisition recorder. The invention carries out imaging utilization on ghost waves, thereby enlarging the data utilization range; the attitude sensor is arranged, so that the influence of the attitude of the cable on ghost waves can be corrected, and the measurement error is reduced; the temperature and pressure sensors are arranged, so that temperature and pressure information can be acquired, and more accurate ghost waves can be acquired; meanwhile, the invention is provided with a strong energy plate to absorb strong reflection energy generated in the ADCP and improve the precision of ghost wave water imaging.
Description
Technical Field
The invention belongs to the technical field of marine exploration, and particularly relates to a two-dimensional sea surface ghost wave water body imaging measurement device, a method and application.
Background
Currently, ADCP is an instrument for measuring the velocity of a water flow profile using the acoustic doppler principle, and is generally equipped with four transducers at an angle to each other. Each transducer is both a transmitter and a receiver. The ADCP can realize the flow velocity profile measurement by utilizing the vector synthesis principle and matching with a real-time signal processing system; the device can obtain the flow velocity of dozens to hundreds of layers in a section through a plurality of experiments under the condition of not interfering a flow field, thereby being widely applied to the fields of large-scale ocean section flow velocity measurement, river flow velocity measurement and the like; the device has the capability of profile analysis, can carry out high-resolution quantitative measurement on the vertical distribution of suspended pollutants in water and the change process of the suspended pollutants along with time, can also observe the dynamic process of sediment movement in a water bottom sediment movement and a cement interface layer, and can also be used for analyzing the distribution and movement rules of large-area pollutants under the action of ocean currents; it has three-dimensional velocity measurement capability, and if laminar flow is considered alone, it can yield vector flow velocity. In the conventional marine seismic data processing, ghost waves are often eliminated as noise, and in order to solve the problem, a large number of ghost wave removing methods for marine seismic acquisition data are developed in recent years to improve the imaging interpretation precision of primary waves. Ghost waves are also reflections from the subsurface geologic volume, and simple rejection of this information can reduce the accuracy of the survey. Therefore, ghost wave prediction and imaging method research is needed to better recover the underground structure information.
Through the above analysis, the problems and defects of the prior art are as follows: ghost waves reflected by the underground geologic body are simply abandoned in the prior art, and the exploration precision is reduced.
The difficulty in solving the above problems and defects is: in offshore exploration, the seismic source and the geophone are usually arranged below the sea level, which can increase both the excitation energy and the quality of the acquired signal. However, there is a large wave impedance difference between air and sea water, and the seismic waves excited by the seismic source not only propagate downward and reflect back to the geophone, but also propagate upward to the sea surface and then reflect and propagate to the underground reflection interface to form ghost waves. The ghost has a smaller time delay and opposite polarity compared with the same secondary wave, which easily results in the loss of partial effective high and low frequency information from the primary wave. Therefore, it is generally eliminated as interference in conventional seismic data processing methods.
The significance of solving the problems and the defects is as follows: with the innovation of processing technology and the improvement of cognition, people realize that the noise in the seismic processing contains abundant underground medium information, and the invention enables ghost waves to be changed from the noise to effective information in the data processing, thereby providing a new direction for the wide-frequency processing method of offshore seismic exploration and improving the exploration precision.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a two-dimensional sea surface ghost wave water body imaging measurement device, a method and application. The invention relates to a measuring device for ghost waves under shallow water conditions on the basis of the conventional Doppler flow velocity measuring instrument. Compared with the traditional measuring device, the device is suitable for shallow water conditions, can absorb strong reflection energy, can realize two-dimensional observation and multiple coverage, and obviously improves the measurement precision.
The invention is realized in such a way that the two-dimensional sea surface ghost wave water body imaging measuring device is provided with a vertical cable;
the vertical cable is arranged in the vertical direction, and the lower end of the vertical cable is connected with the digital packet; the upper end of the vertical cable is connected with a floating ball, the ADCP is arranged above the floating ball, and the strong energy absorption plate is placed on the sea surface above the ADCP.
Furthermore, the upper part of the digital packet is provided with an attitude sensor, a temperature sensor, a GPS and a pressure sensor; the middle of the digital packet is provided with an earthquake acquisition recorder, six multilayer digital boards are arranged inside the digital packet, and the digital packet is connected with a vertical cable through a digital packet watertight connector positioned at the top;
the lower end of the digital packet is provided with a battery bin, and the bottom of the whole digital packet is connected with a metal base; the digital bag is externally provided with a nineteen-pin digital bag watertight connector, and the digital bag watertight connector is connected with a vertical cable.
Further, the six multilayer digital boards are respectively: the system comprises a master control board, a seismic data acquisition board A, a seismic data acquisition board B, a seismic data acquisition board C, a temperature and pressure acquisition board and a GPS and inclination data acquisition board.
Furthermore, the upper part of the vertical cable is provided with an attitude sensor, and twelve hydrophone combinations are arranged in the vertical cable;
a nineteen-pin cable watertight connector is arranged on the vertical cable connecting section, the cable watertight connector is connected with a digital packet watertight joint at the top of the digital packet, and a high-strength titanium alloy metal protective sleeve is also arranged outside the digital packet watertight joint; the end of the vertical cable adopts a high-strength titanium alloy metal protective sleeve, and the protective sleeve is separated from the middle of the cable.
Furthermore, the distance between the hydrophone combination channels is 1 meter, the hydrophone combination adopts the front and back combination of two marine piezoelectric detectors, the distance between the hydrophone combination and the cable is 0.2 meter, and polyurethane solid materials are filled between the hydrophone combination and the cable;
the cable is divided into a plurality of groups, the outside of the cable is wrapped by a high-strength polyamide material, and Kevlar fiber is mixed in the polyamide material.
Further, the ADCP comprises an electronic cabin, an electronic cabin end cover, a transducer base, four flow velocity measurement probes and a temperature and pressure sensor;
the electronic cabin is a hollow cylinder, and the top flange ring and the bottom flange ring are provided with screw mounting holes; the electronic cabin end cover is arranged on the top of the electronic cabin through a screw;
the energy converter base is arranged at the bottom of the electronic cabin through a screw, and a watertight connector is fixed at the top of the end cover of the electronic cabin; the internal terminal of the watertight connector is communicated with the inner cavity of the electronic cabin, and the external terminal is sealed by a plug of the watertight connector; and a transducer base mounting plane is arranged at the gap position of the bottom of the transducer base, which is positioned in the flow velocity measurement probe mounting hole.
Furthermore, the outer bottom of the transducer base is provided with four flow velocity measurement probe mounting holes which are uniformly distributed in the circumferential direction, the four flow velocity measurement probes are annularly distributed and mounted in the flow velocity measurement probe mounting holes of the transducer base, the central axis of the measurement beam and the central axis of the hollow cylinder of the ADCP electronic cabin are in the same slope angle, the slope surface takes the central axis of the ADCP electronic cabin as a vertex, the central axis gradually reduces towards the side edge, and the fixing screws of the flow velocity measurement probes are mounted and fixed outwards from the inner wall of the transducer base.
Furthermore, a temperature and pressure sensor mounting hole vertical to the inner wall is formed in a concave spherical surface of the inner wall of the transducer base, and a temperature and pressure sensor is mounted in the temperature and pressure sensor mounting hole; the temperature and pressure sensor is of a watertight structure and is provided with a waterproof sealing piece;
the bottom of the temperature and pressure sensor mounting hole is provided with at least one vent hole communicated with the outer side of the transducer base, the vent hole is vertically arranged on the transducer base mounting plane, and the inside of the vent hole is communicated with the temperature and pressure sensor mounting hole;
a temperature and pressure sensor sealing cover mounting plane is arranged at the periphery of the temperature and pressure sensor mounting hole, and a plurality of screw holes are arranged;
the temperature and pressure sensor sealing cover mounting plane is provided with a temperature and pressure sensor sealing cover through a screw in a sealing manner, the temperature and pressure sensor sealing cover is used for limiting and fixing the temperature and pressure sensor, a round temperature and pressure sensor wire outlet hole is formed in the middle of the temperature and pressure sensor sealing cover mounting plane, and the temperature and pressure sensor sealing cover is mounted on the inner wall of the transducer base through a screw.
Further, a thin film is arranged on the surface of the strong energy absorption plate, a circular mass sheet is fixed at the center of the surface of the thin film, and a rigid wall is arranged at a certain distance behind the thin film with the mass sheet; a section of closed air cavity is formed between the rear surface of the film and the rigid wall, and foam is fixed behind the rigid wall.
Another object of the present invention is to provide a two-dimensional sea ghost water body imaging measurement method of the two-dimensional sea ghost water body imaging measurement apparatus, the two-dimensional sea ghost water body imaging measurement method including:
testing the vertical cable before construction, connecting and sealing the digital packet and the watertight connector of the cable, carefully checking interfaces of all parts to ensure no loosening phenomenon, testing the voltage and the electric quantity of the battery, and tying a floating ball at the upper end of the vertical cable after all parts of the whole set of device are installed;
the digital packet connected with the vertical cable is placed on a small ship, the ship is positioned by a GPS, and the ship is driven to a designated point of the digital packet in an observation system; firstly, putting a vertical cable and a floating ball into water, and then sinking a digital bag into the seabed;
the collision between the cable and the detector and the ship body is avoided in the cable laying process, the change of the tidal current direction and the water depth in the work area is determined during cable laying, and the reasonable offset is determined;
when the sea surface condition is quite complex, determining the offset according to the field experiment result during construction; during cable laying, lofting is carried out according to the designed coordinates and by adopting special navigation software; after the cable is placed, the gas gun seismic source is excited, the cable is recovered after excitation and reception are finished, the folded cable, the digital packet and the detector are checked, and when problems are found, maintenance or replacement is carried out in time.
The invention also aims to provide an application of the two-dimensional sea surface ghost wave water body imaging measuring device in testing the water flow profile speed.
By combining all the technical schemes, the invention has the advantages and positive effects that: the invention carries out imaging utilization on ghost waves, thereby enlarging the data utilization range; the attitude sensor is arranged, so that the influence of the attitude of the cable on ghost waves can be corrected, and the measurement error is reduced; the temperature and pressure sensors are arranged, so that temperature and pressure information can be acquired, and more accurate ghost waves can be acquired; meanwhile, the invention is provided with a strong energy plate to absorb strong reflection energy generated in the ADCP and improve the precision of ghost wave water imaging.
Drawings
Fig. 1 is a schematic structural diagram of a two-dimensional sea-surface ghost wave water body imaging measurement apparatus provided by an embodiment of the present invention.
Fig. 2 is a schematic diagram of an internal structure of a digital packet according to an embodiment of the present invention.
Fig. 3 is a top view of a digital packet according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a hydrophone provided by an embodiment of the invention.
FIG. 5 is a schematic view of a watertight joint for a vertical cable according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of an ADCP structure according to an embodiment of the present invention.
Figure 7 is a side view of an ADCP apparatus provided by an embodiment of the invention.
Fig. 8 is a schematic diagram of a structure of a strong energy absorbing plate according to an embodiment of the present invention.
In the figure: 1. a vertical cable; 2. a digital packet; 3. ADCP; 4. a floating ball; 5. a strong energy absorbing plate; 6. an attitude sensor; 7. a digital water-tight joint; 8. a temperature sensor; 9. a GPS; 10. a pressure sensor; 11. a temperature and pressure acquisition plate; 12. a tilt data acquisition board; 13. a master control board; 14. a seismic data acquisition board A; 15. a seismic data acquisition board B; 16. seismic data acquisition version C; 17. a battery compartment; 18. a metal base; 19. a hydrophone assembly; 20. a marine piezoelectric geophone; 21. a cable watertight joint; 22. an electronic compartment; 23. an electronic compartment end cap; 24. a transducer base; 25. four flow rate measurement probes; 26. a temperature and pressure sensor; 27. a film; 28. a circular ring-shaped mass sheet; 29. a rigid wall; 30. and (3) foaming.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems in the prior art, the invention provides a two-dimensional sea surface ghost wave water body imaging measurement device, a method and application thereof, and the invention is described in detail below with reference to the accompanying drawings.
Those skilled in the art can also implement the two-dimensional ghost-sea-wave water body imaging and measuring device by using other steps, and the two-dimensional ghost-sea-wave water body imaging and measuring device provided by the invention shown in fig. 1 is only one specific embodiment.
As shown in fig. 1, a two-dimensional sea ghost wave water body imaging measurement apparatus provided by an embodiment of the present invention includes: a vertical cable 1, a digital bag 2, an ADCP3, a floating ball 4 and a strong energy absorbing plate 5. Wherein, vertical cable 1 arranges in the vertical direction, and vertical cable 1 lower extreme is connected with digital package 2, and floater 4 is connected to vertical cable 1 upper end, and ADCP3 settles above floater 4, and strong energy absorption board 5 places on the sea above the ADCP.
As shown in fig. 2-3, the digital bag 2 provided by the embodiment of the present invention is externally provided with a 19-pin digital-bag watertight connector 7 for connecting a vertical cable 1. The upper part of the digital bag 2 is provided with an attitude sensor 6, a temperature sensor 8, a GPS9 and a pressure sensor 10; the middle of the digital packet 2 is provided with an earthquake acquisition recorder, six multilayer digital boards are arranged inside the earthquake acquisition recorder and are connected with the vertical cable 1 through a digital packet watertight connector 7 positioned at the top, and the earthquake acquisition recorder internally comprises a master control board 13, an earthquake data acquisition board A14, an earthquake data acquisition board B15, an earthquake data acquisition board C16, a temperature and pressure acquisition board 11, a GPS9 and an inclination data acquisition board 12; the lower end of the digital packet 2 is provided with a battery bin 17, and the bottom of the whole digital packet is connected with a metal base 18 so as to keep the digital packet in a stable posture on the seabed.
The digital packet 2 adopts a continuous acquisition mode, the maximum sampling frequency is downsampled for 148 hours continuously, and a series of high and new technologies are adopted in the design of the seismic acquisition recorder: (1) an embedded controller, ARM-AT91RM9200, is adopted, and compared with a common microcomputer, the microcomputer has the characteristics of small volume, low power consumption, high working reliability, powerful function and the like; (2) the CS5372/5376 component is adopted to form a 24-bit analog-to-digital converter, the dynamic range is large (the highest can reach 120dB), the component is optional, and the component has strong detection capability and is suitable for acquiring seismic data. (3) ACTEL, AGL250V5 and FPGA are used for address latching, gating, data string-parallel format conversion, counting, frequency division, logic control and the like, so that the instrument is miniaturized and portable, is convenient to store and upgrade; (4) by adopting the FIFO buffer and the flash memory electronic disk, the storage capacity is 4G per track, and the accuracy and the authenticity of data recording are ensured.
The main control board 13 adopts the ARM9 as a main controller, includes functions of memory, network, FLASH and the like, and controls the whole acquisition station through an interface, including acquisition and storage of seismic data, and monitoring of external arrangement state and internal working state. The logic circuit provides control logic for the whole machine. The circuit design adopts a large-scale programmable gate array. The unit also includes a time-service clock generator for a high precision GPS7 to provide a standard clock for the overall machine control and delta sigma A/D converter. The high-precision internal signal source generates sine waves and square waves with distortion indexes reaching the level of five millionths and various frequency amplitudes. The power supply adopts a high-efficiency LM1755 chip to generate +3.3V and +/-2.5V analog power supplies. Therefore, continuous analog signals are converted into discrete digital signals, and digitization of the cable is achieved. The acquisition board is powered by an external input 4V direct current power supply. Because of the requirement of precise sampling, the power supply is subjected to secondary processing on the acquisition board, and eight types of analog power supplies (+2.5AV, -2.5AV, +3.3AV, + VRefA, -VRefA, + VRefB, -VRefB and + TSGV) and two types of digital power supplies (+3.3DV, +3.3DV2) are converted from an externally input 4V direct current power supply. The ripple coefficient requirement of the acquisition board on the power supply voltage is high, the ripple voltage of the inlet voltage 4V is controlled to be 10-15mV, and the ripple of the converted analog power supply is controlled to be about 0.05 mV. The GPS is connected with the inclination angle data acquisition board 12, the attitude sensor 6 in the working section of the vertical cable 1 and the GPS9, and is used for acquiring data transmitted in the attitude sensor 6 and data in the GPS9 and transmitting the acquired data to a memory on the main control board 13 for storage. The temperature and pressure data acquisition board 11 is used for acquiring data in the temperature sensor 7 and the pressure sensor 9 respectively and outputting the data to a memory under the master control board 13 for storage. The battery compartment 17 located at the bottom is used for supplying power to each part of the whole device, and comprises a power supply conversion circuit unit which converts the battery voltage into various power supplies required by the acquisition system, including a digital system power supply, an analog system power supply, a/D converter high-precision reference voltage and the like. The battery compartment 17 is charged through the digital packet watertight connector 7 positioned at the top, and the inside of the whole sphere is sealed by adopting polyvinyl chloride casting.
As shown in fig. 4-5, an attitude sensor 6 is arranged at the upper part of the vertical cable 1 and used for recording the attitude of the vertical cable, 12 hydrophone assemblies 19 are arranged in the vertical cable 1, the channel spacing is 1 meter, the hydrophone assemblies 19 are formed by combining two marine piezoelectric detectors 20 in front and back, the group internal spacing is 0.2 meter, and polyurethane solid materials are filled between the cable and the hydrophone assemblies 19. A plurality of groups of cables are arranged among the hydrophone assemblies 19, the exterior of each hydrophone assembly is wrapped by a high-strength polyamide material, and Kevlar fibers are mixed in the polyamide material. The connecting section of the vertical cable 1 is provided with a 19-pin cable watertight connector 21 which can be connected with a digital packet watertight connector 7 at the top of the digital packet 2. The tail end of the vertical cable 1 is provided with a high-strength titanium alloy metal protective sleeve, the protective sleeve is separated from the middle of the cable, the tail end of the vertical cable 1 is connected with a digital packet watertight connector 7 at the top of the digital packet 2 through a 19-pin cable watertight connector 21, and the high-strength titanium alloy metal protective sleeve is also arranged outside the digital packet watertight connector 7. When in connection, the high-strength titanium alloy metal protective sleeve and the Kevlar fiber continuously receive force, and the interface of the internal cable is not stressed.
As shown in fig. 6-7, the ADCP3 includes an electronics pod 22, an electronics pod end cap 23, a transducer base 24, four flow rate measurement probes 25, and a temperature and pressure sensor 26. The electronic cabin 22 is a hollow cylinder, and the top flange ring and the bottom flange ring are both provided with screw mounting holes; the electronic cabin end cover 23 is installed at the top of the electronic cabin 22 through screws, the transducer base 24 is installed at the bottom of the electronic cabin 22 through screws, and a watertight connector is fixed at the top of the electronic cabin end cover 23. The internal terminal of the watertight connector is communicated with the inner cavity of the electronic cabin 22, and the external terminal is sealed by a watertight connector plug. The outer bottom of the transducer base 24 is provided with 4 flow velocity measurement probe mounting holes which are uniformly distributed in the circumferential direction, the four flow velocity measurement probes 25 are annularly distributed and mounted in the flow velocity measurement probe mounting holes of the transducer base 24, the central axis of the measurement beam and the central axis of the hollow cylinder of the ADCP electronic cabin 22 are in the same slope angle, the slope surface of the measurement beam and the central axis of the ADCP electronic cabin 22 are taken as the top point, and the measurement beam gradually decreases towards the side edge. The fixing screws of the flow rate measuring probe 25 are all installed and fixed outwards from the inner wall of the transducer base 3. Since the ADCP also needs to measure the current water temperature and water pressure, a temperature and pressure sensor mounting hole perpendicular to the inner wall is formed on the concave spherical surface of the inner wall of the transducer base 24 for mounting the temperature and pressure sensor 26. At least one vent hole is arranged at the bottom of the temperature and pressure sensor mounting hole and communicated with the outer side of the transducer base 24, so that the sensing energy of the temperature and pressure sensor 26 can contact with external fluid. The periphery of the temperature and pressure sensor mounting hole is provided with 1 temperature and pressure sensor sealing cover mounting plane and is provided with a plurality of screw holes for sealing and mounting the temperature and pressure sensor sealing cover. The temperature and pressure sensor sealing cover is used for limiting and fixing the temperature and pressure sensor 26, a round temperature and pressure sensor 26 wire outlet hole is formed in the middle of the temperature and pressure sensor sealing cover, and the temperature and pressure sensor sealing cover is installed on the inner wall of the transducer base 24 through screws. The temperature and pressure sensor 26 is a watertight structure with a waterproof sealing member. And a transducer base mounting plane is arranged at the bottom of the transducer base 24 and positioned in the gap position of the flow velocity measurement probe mounting hole. The vent hole of the temperature and pressure sensor 26 is vertically arranged on the transducer base mounting plane, and the inside of the vent hole is communicated with the temperature and pressure sensor mounting hole.
As shown in fig. 8, the strong energy absorbing plate 5 is placed on the sea surface right above the ADCP3, and is used for absorbing strong energy above 10kHZ generated by exciting the ADCP3 to suppress interference of strong energy generation, thereby improving the imaging accuracy of the water body. The surface of the strong energy absorption plate 5 is provided with a film 27, and the center of the surface of the film 27 is fixed with a circular mass plate 28; a rigid wall 29 is arranged at a certain distance behind the film with the mass sheet; a section of closed air cavity will be formed between the rear surface of the membrane and the rigid wall behind which the foam 30 is secured.
The working principle of the invention is as follows: the vertical cable is tested before construction, the digital packet and the watertight connector of the cable are connected and sealed, interfaces of all parts are carefully checked to ensure that no looseness exists, the voltage and the electric quantity of the battery are tested, and the floating ball is tied to the upper end of the vertical cable after all parts of the whole device are installed.
The digital packet connected with the vertical cable is placed on a small ship, the ship is positioned by a GPS, the ship is driven to a designated point of the digital packet in an observation system, the vertical cable and the floating ball are firstly placed in water, and then the digital packet is sunk into the seabed. The cable and the detector are prevented from colliding with the ship body in the cable laying process, and the reasonable offset is determined by considering the change of the tidal current direction and the water depth in the work area during cable laying. When the sea surface condition is quite complex, the offset is determined according to the field experiment result during construction. And during cable laying, lofting is carried out according to the designed coordinates and by adopting special navigation software. After the cable is placed, the gas gun seismic source is excited, the cable is recovered after excitation and reception are finished, the folded cable, the digital packet and the detector are checked, and when problems are found, maintenance or replacement is carried out in time.
Demonstration section (concrete examples/experiments/simulation/positive experimental data capable of demonstrating the inventive aspects of the invention, etc.)
Examples
The method comprises the following steps that firstly, a vertical cable is tested before construction, a digital packet and a watertight joint of the cable are connected and sealed well, and interfaces of all parts are carefully checked to ensure that the cable is free from loosening;
step two, testing the voltage and the electric quantity of the battery, and tying a floating ball at the upper end of the vertical cable after all parts of the whole device are installed;
thirdly, the digital packet connected with the vertical cable is placed on a small ship, the ship is positioned by a GPS, and the ship is driven to a specified point of the digital packet in an observation system;
and step four, putting the vertical cable and the floating ball into water, and then sinking the digital packet into the seabed. The cable and the detector are prevented from colliding with the ship body in the cable laying process, and the reasonable offset is determined by considering the change of the tidal current direction and the water depth in the work area during cable laying. When the sea surface condition is quite complex, the offset is determined according to the field experiment result during construction. And during cable laying, lofting is carried out according to the designed coordinates and by adopting special navigation software.
And fifthly, after the cable is placed, activating a gas gun seismic source, recovering the cable after excitation and reception are finished, checking the folded cable, the digital packet and the detector, and maintaining or replacing the cable, the digital packet and the detector in time when problems are found.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a two-dimentional sea ghost wave water body formation of image measuring device which characterized in that, two-dimentional sea ghost wave water body formation of image measuring device is provided with:
a vertical cable;
the vertical cable is arranged in the vertical direction, and the lower end of the vertical cable is connected with the digital packet; the upper end of the vertical cable is connected with a floating ball, the ADCP is arranged above the floating ball, and the strong energy absorption plate is placed on the sea surface above the ADCP.
2. The two-dimensional sea surface ghost wave water body imaging and measuring device as claimed in claim 1, wherein an attitude sensor and a temperature sensor, a GPS and a pressure sensor are arranged on the digital packet; the middle of the digital packet is provided with an earthquake acquisition recorder, six multilayer digital boards are arranged inside the digital packet, and the digital packet is connected with a vertical cable through a digital packet watertight connector positioned at the top;
the lower end of the digital packet is provided with a battery bin, and the bottom of the whole digital packet is connected with a metal base; the digital bag is externally provided with a nineteen-pin digital bag watertight connector, and the digital bag watertight connector is connected with a vertical cable.
3. The two-dimensional sea ghost wave water imaging measuring device of claim 2, wherein the six multi-layer digital boards are respectively: the system comprises a master control board, a seismic data acquisition board A, a seismic data acquisition board B, a seismic data acquisition board C, a temperature and pressure acquisition board and a GPS and inclination data acquisition board.
4. The two-dimensional sea surface ghost wave water body imaging measurement device according to claim 1, wherein a posture sensor is arranged at the upper part of the vertical cable, and twelve hydrophone assemblies are arranged inside the vertical cable;
a nineteen-pin cable watertight connector is arranged on the vertical cable connecting section, the cable watertight connector is connected with a digital packet watertight joint at the top of the digital packet, and a high-strength titanium alloy metal protective sleeve is also arranged outside the digital packet watertight joint; the end of the vertical cable adopts a high-strength titanium alloy metal protective sleeve, and the protective sleeve is separated from the middle of the cable.
5. The two-dimensional sea surface ghost wave water body imaging measurement device according to claim 4, wherein the distance between the hydrophone combination channels is 1 meter, the hydrophone combination adopts two marine piezoelectric detectors which are combined in a front-back mode, the distance between the hydrophone combination and the cable is 0.2 meter, and polyurethane solid materials are filled between the hydrophone combination and the cable;
the cable is divided into a plurality of groups, the outside of the cable is wrapped by a high-strength polyamide material, and Kevlar fiber is mixed in the polyamide material.
6. The two-dimensional sea surface ghost wave water imaging measurement device of claim 1, wherein the ADCP comprises an electronic cabin, an electronic cabin end cover, a transducer base, four flow velocity measurement probes, and a temperature and pressure sensor;
the electronic cabin is a hollow cylinder, and the top flange ring and the bottom flange ring are provided with screw mounting holes; the electronic cabin end cover is arranged on the top of the electronic cabin through a screw;
the energy converter base is arranged at the bottom of the electronic cabin through a screw, and a watertight connector is fixed at the top of the end cover of the electronic cabin; the internal terminal of the watertight connector is communicated with the inner cavity of the electronic cabin, and the external terminal is sealed by a plug of the watertight connector; and a transducer base mounting plane is arranged at the gap position of the bottom of the transducer base, which is positioned in the flow velocity measurement probe mounting hole.
7. The two-dimensional sea surface ghost wave water imaging measuring device of claim 6, wherein four flow velocity measurement probe mounting holes are formed in the outer bottom of the transducer base and are circumferentially and uniformly arranged, the four flow velocity measurement probes are circumferentially arranged and mounted in the flow velocity measurement probe mounting holes of the transducer base, the central axis of a measurement beam and the central axis of the hollow cylinder of the ADCP electronic cabin are at the same slope angle, the slope surface takes the central axis of the ADCP electronic cabin as a vertex and gradually decreases towards the side edge, and fixing screws of the flow velocity measurement probes are mounted and fixed outwards from the inner wall of the transducer base;
a temperature and pressure sensor mounting hole vertical to the inner wall is formed in a concave spherical surface on the inner wall of the transducer base, and a temperature and pressure sensor is mounted in the temperature and pressure sensor mounting hole; the temperature and pressure sensor is of a watertight structure and is provided with a waterproof sealing piece;
the bottom of the temperature and pressure sensor mounting hole is provided with at least one vent hole communicated with the outer side of the transducer base, the vent hole is vertically arranged on the transducer base mounting plane, and the inside of the vent hole is communicated with the temperature and pressure sensor mounting hole;
a temperature and pressure sensor sealing cover mounting plane is arranged at the periphery of the temperature and pressure sensor mounting hole, and a plurality of screw holes are arranged;
the temperature and pressure sensor sealing cover mounting plane is provided with a temperature and pressure sensor sealing cover through a screw in a sealing manner, the temperature and pressure sensor sealing cover is used for limiting and fixing the temperature and pressure sensor, a round temperature and pressure sensor wire outlet hole is formed in the middle of the temperature and pressure sensor sealing cover mounting plane, and the temperature and pressure sensor sealing cover is mounted on the inner wall of the transducer base through a screw.
8. The two-dimensional sea ghost wave water imaging measuring device of claim 1, wherein the surface of the strong energy absorbing plate is provided with a thin film, a circular ring-shaped mass plate is fixed at the center of the surface of the thin film, and a rigid wall is arranged at a certain distance behind the thin film with the mass plate; a section of closed air cavity is formed between the rear surface of the film and the rigid wall, and foam is fixed behind the rigid wall.
9. The two-dimensional sea ghost water body imaging measurement method of the two-dimensional sea ghost water body imaging measurement device according to any one of claims 1 to 8, wherein the two-dimensional sea ghost water body imaging measurement method comprises the following steps:
testing the vertical cable before construction, connecting and sealing the digital packet and the watertight connector of the cable, carefully checking interfaces of all parts to ensure no loosening phenomenon, testing the voltage and the electric quantity of the battery, and tying a floating ball at the upper end of the vertical cable after all parts of the whole set of device are installed;
the digital packet connected with the vertical cable is placed on a small ship, the ship is positioned by a GPS, and the ship is driven to a designated point of the digital packet in an observation system; firstly, putting a vertical cable and a floating ball into water, and then sinking a digital bag into the seabed;
the collision between the cable and the detector and the ship body is avoided in the cable laying process, the change of the tidal current direction and the water depth in the work area is determined during cable laying, and the reasonable offset is determined;
when the sea surface condition is quite complex, determining the offset according to the field experiment result during construction; during cable laying, lofting is carried out according to the designed coordinates and by adopting special navigation software; after the cable is placed, the excitation of a gas gun seismic source is carried out, the cable is recovered after the excitation and the receiving are finished, the folded cable, the digital packet and the detector are checked, and when problems are found, the cable is maintained or replaced in time.
10. Use of the two-dimensional sea ghost wave water body imaging measurement device according to any one of claims 1-8 for testing water flow profile velocity.
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