51 results about "Ocean bottom seismograph" patented technology

The invention discloses a broadband ocean bottom seismograph comprising two protecting shells and a connecting plate, wherein the two protecting shells are respectively fixed on both ends of the connecting plate; a sealed instrument storehouse ball and a sealed battery storehouse ball are respectively installed in the two protecting shells; a battery and an acoustic communication circuit are installed in the battery storehouse ball; two sealed storehouse balls are electrically connected by a cable; a gimbal for keeping the seismograph in a level state is arranged in the instrument storehouse ball and provided with a data collector and a seismograph; an electro erosion releasing mechanism for releasing a coupling frame is fixed on the connecting plate; the coupling frame for supplying downforces for the seismograph is positioned below the connecting plate and connected with the electro erosion releasing mechanism by wire ropes; and a weighting frame is connected below the coupling frame by an iron chain. The broadband ocean bottom seismograph can be used in deep ocean, and the observed broadband range is 40 s to 40 Hz; and the broadband ocean bottom seismograph is suitable not onlyfor viewing the ocean bottom natural earthquake, but also for viewing ocean bottom manmade earthquake source.

The invention discloses an anti-trawl seabed base of an ocean bottom seismograph. The anti-trawl seabed base of the ocean bottom seismograph comprises placing devices, an OBS, a sinking coupling frame, a floating body cabin, a floating body, an acoustic releaser, a recycling rope cabin, a recycling rope, a main cabin, a square vertical shaft, an outer cover of an octagonal prismaid shape and a bottom-sitting frame. The main points are that the main cabin is formed by corresponding connection of the bottom of the outer cover of the octagonal prismaid shape and the bottom-sitting frame, the recycling rope cabin, the placing devices and the square vertical shaft are fixed on the bottom-sitting frame, the square vertical shaft and the recycling rope cabin are arranged at the center and one side of the main cabin respectively, the acoustic releaser is fixed in the center of the floating body, the floating body is arranged in the floating body cabin on the top of the recycling rope cabin, and the recycling rope connected with the floating body is connected with the recycling rope cabin. The sinking coupling frame that fixes the OBS is fixed in the center of the square vertical shaft, and is connected with side edge U-shaped rings of the placing devices through flexible connecting devices. The anti-trawl seabed base of the ocean bottom seismograph has the advantages of having high system security, can resist movement and impact damage of operation of a trawler, and satisfies the requirements for long-term, fixed point, continuous, and automatic monitoring in severe environment.

The invention provides a broadband ocean bottom seismograph with a single glass sphere. The seismograph comprises an anchor at its bottom having a frame structure with a rigid ring for accommodating a seismometer chamber. The seismometer chamber comprises a bell-shaped protective hood opening downward where a seismometer sealed chamber is suspended to the inner surface of the protective hood by cables. The bottom of the seismometer sealed chamber protrudes through the opening of the protective hood to be seated in direct contact with the seabed. A functional chamber comprises a plastic instrument chamber and a glass global instrument chamber secured in the plastic chamber. The plastic instrument chamber is fixedly mounted on top of the protective hood. A release mechanism is mounted on the top of the functional chamber, and connected to frame of the anchor via fusible tensioning steel wires.

The invention discloses a real-time transmission multifunctional ocean bottom seismograph, which comprises an instrument cabin, an underwater acoustic modulator demodulator, an unhooking mechanism and a settlement coupling rack, wherein the instrument cabin comprises a glass instrument cabin and a plastic instrument cabin; the glass instrument cabin is fixedly arranged in the plastic instrument cabin; the unhooking mechanism is positioned on the top end of the plastic instrument cabin; the underwater modom of the underwater acoustic modulator demodulator is fixedly arranged on the side surface of the unhooking mechanism; the unhooking mechanism and the settlement coupling rack are fixedly connected by a tensioning steel wire; and the instrument cabin is fixed in the settlement coupling rack. Because the advanced underwater acoustic modulator demodulator and the advanced acoustic bandwidth frequency spread technology are adopted by the real-time transmission multifunctional ocean bottom seismograph disclosed by the invention, the underwater real-time communication function of the real-time transmission multifunctional ocean bottom seismograph is realized, the problems of low reliability, low data rate and high power consumption and the like of the traditional product in underwater communication are effectively overcome, and the real-time transmission multifunctional ocean bottom seismograph is suitable for the shallow sea marine geology observation.

The invention discloses a portable small ocean bottom seismograph. The seismograph comprises: a plastic apparatus capsule, an electric corrosion releasing mechanism and a sink coupling frame. An acoustic pressure sensor is arranged on a top of a glass cabin ball. An all-attitude high frequency detector, an acoustic communication module, a wireless beacon machine, a GPS, an electronic compass and a power supply is arranged in the glass cabin ball. The sink coupling frame is a pedestal. By using a bonding mode of the all-attitude high frequency detector, an internal space can be greatly saved. An attitude adjustment operation of an internal seismometer can be simplified. Single point connection under the ball is used as a decoupling way so that installation is easy and a structure is stableand reliable. A diameter of the glass cabin ball of the ocean bottom seismograph in the invention is 13 inches. A volume is small and weight is light. Cost is low. The internal structure is compact. An offshore construction is convenient. The apparatus possesses a high resonant frequency. A working frequency is 300Hz. The seismograph is suitable for fine seabed geology structure detection. The three-component high frequency detector and the acoustic pressure sensor can cooperate with various kinds of artificial seismic sources so as to carry out high-efficient and high-density seismic detection and geology investigations.

The invention provides a real-time clock error correction method used an exploration instrument. The method is a clock drift compensation method having a self-learning function. The method is used for compensating the influence of crystal oscillator frequency point drift on the system clock accuracy of the instrument. The method includes two functions of clock error learning and clock error correction. The clock error learning function provides the basis of clock frequency difference of the dynamic inspection work state. The clock error correction function monitors nodal ocean bottom seismograph clocks in work in real time so that the time accuracy of the nodal ocean bottom seismographs is ensured to be within a positive and negative sampling interval. The problem of difficulty of clock correction caused by great change of the common crystal oscillator frequency point along with external factors can be solved, and the method has the characteristics of being lightweight and easy to transplant.

The invention discloses a combined ocean bottom seismograph azimuth angle automatic identification device and method, and belongs to the technical field of ocean seismic exploration. According to themethod, natural source background noise sequences recorded by original three-component seismometers of any two combined type ocean bottom seismometers are used as input data. Firstly, a three-component Green function between the pair of instruments is solved based on a noise cross-correlation algorithm. A plurality of initial azimuth angles are then obtained by using Green function correlation coefficient maxima of the rotating horizontal components of a plurality of instrument pairs in the range of 0 DEG to 360 DEG. And finally, the plurality of initial azimuth angles are screened by utilizing a data window and a statistical analysis result to confirm a final azimuth angle. Meanwhile, the invention discloses the device for automatically identifying the azimuth angle of the natural sourceseismic data of the combined type ocean bottom seismographs. According to the invention, the natural source earthquake observation data preprocessing rate of the combined type ocean bottom seismographs in ocean energy and resource development monitoring can be greatly improved.

The invention relates to submarine seismic observation, in particular to a submarine seismograph laying recoverer and a method. The submarine seismograph laying recoverer comprises a deep sea lander frame, an acoustic release mechanism, a floating body material, a communication detection instrument and an OBS device, and the deep sea lander frame sequentially comprises a communication detection instrument mounting frame, a floating body material mounting frame, an OBS mounting frame and a one-way latch mounting frame from top to bottom; the communication detection instrument mounting frame, the floating body material mounting frame, the OBS mounting frame and the one-way latch mounting frame are all fixedly connected with the vertical supporting rods, and the balance weight is located at the bottom of the frame and connected with the acoustic release mechanism. The OBS device is arranged and recycled, the one-way clamping teeth are arranged between the OBS device and the seabed, the OBS device is prevented from directly colliding with and making contact with the seabed, meanwhile, the OBS device and the seabed are well coupled, and the working quality is guaranteed.

The invention discloses an automatic seismograph leveling and locking device and relates to the technical field of marine seismic observation. The automatic seismograph leveling and locking device comprises a sensor, a leveling mechanism, two groups of locking mechanisms and a control component, wherein the sensor is arranged on the top of a seismograph and is used for detecting whether the seismograph is horizontal or not; the leveling mechanism comprises an outer balance ring, an inner balance ring and a clamping ring; the seismograph is fixed in the clamping ring; a center of gravity of the seismograph is lower than a horizontal plane where the clamping ring is positioned, the clamping ring is pivoted inside the inner balance ring, and the inner balance ring is pivoted inside the outer balance ring; the two groups of locking mechanisms are respectively used for locking relative positions of the clamping ring and the inner balance ring and relative positions of the inner balance ring and the outer balance ring; the control component is electrically connected with the sensor and the two groups of locking mechanisms and is used for receiving detection results from the sensor and sending operation instructions to the two groups of locking mechanism. The invention provides the automatic seismograph leveling and locking device which is used for solving a problem that an automatic leveling and locking function cannot be fulfilled by a seabed seismograph.

The invention discloses an optical fiber multi-channel seismic system for detecting a stratum transverse wave velocity structure in an extremely shallow sea area. The system comprises an gas explosionsource used for exciting strong energy in a shallow sea land area and a seabed, a distributed acoustic sensing optical fiber array used for sensing a seabed stratum strain and a stress change, and ademodulation recording unit used for demodulating external strain stress field information sensed by the distributed acoustic sensing optical fiber array into seismic wave signals and realizing continuous acquisition, recording and storage. The distributed acoustic sensing optical fiber array comprises an optical fiber starting end, an optical fiber connecting section, an optical fiber array and an optical fiber tail end; and linear display cloth, Z-shaped display cloth or O-shaped display cloth can be adopted. A sensing distance reaches 10 kilometers, a channel spacing is dynamically adjustable, and the number of collected seismic channels reaches ten thousand so that the system is easily suitable for high-density space sampling of seabed transverse wave signals in the extremely shallow water area; and meanwhile, the system has the advantages of ''streamer earthquake'' multi-channel observation and long-time continuous recording of an ''ocean bottom seismograph'', and transverse wavespeed information which cannot be obtained by a traditional streamer earthquake can be observed.

The invention provides an ocean bottom seismograph anchor. The ocean bottom seismograph anchor comprises a platform, a plurality of guiding covers, a support cone, and a permanent magnet, the guiding covers are fixed under the platform, the bottom of the support cone is fixed on the platform, the peak of the support cone is used for supporting an ocean bottom seismograph, and the permanent magnet is fixed at the bottom of the ocean bottom seismograph. According to the ocean bottom seismograph anchor, the guiding covers are uniformly arranged under the platform so that the ocean bottom seismograph can keep balance in a sinking process, and the guiding covers and the ocean bottom can be well coupled; and the ocean bottom seismograph can guarantee the fixed azimuth under the effect of the geomagnetic force of the permanent magnet.

The invention discloses a self-sinking and self-floating type broadband single/multi-cabin ball ocean bottom seismograph, which comprises one or more glass instrument cabin balls and ballasting anchors arranged at the bottoms of the glass instrument cabin balls, wherein an underwater acoustic control circuit board, an all-attitude high-frequency detector, a GPS, a battery pack, an electronic compass and an underwater acoustic communication module are arranged in each glass instrument cabin ball. The seismograph is characterized in that a lifting control mechanism for recovering the glass instrument cabin balls is arranged between the glass instrument cabin balls and the ballasting anchors. The purpose of full-automatic buoyancy regulation and control is achieved, convenient use is achieved, the recovery efficiency and success rate of the ocean bottom seismograph can be improved, the recovery failure rate of the seismograph is reduced, and the purpose of full-automatic recovery is realized; and the mechanism adjusts the buoyancy by controlling the amount of seawater entering and exiting, so that compared with a traditional damage modes such as electro-corrosion and electric fusing,the mechanism not only reduces the maintenance amount of equipment, but also can be repeatedly used, thereby greatly reducing the use cost .

The present invention discloses an OBS clock correction method based on a background noise cross-correlation technology. An ocean bottom seismograph (OBS) is employed to record to original seismic data of N days, one noise cross-correlation function (NCF) between each two stations in each day is calculated according to the original seismic data, and the symmetry analysis method of the NCF in eachday is employed to calculate the clock difference between the stations. A reference NCF is formed by dynamic clock difference correction overlapping of the NCFs of all the days, and static clock difference is obtained according to that the reference NCF is subjected to positive and negative arrival; dynamic clock difference is obtained according to the NCF of each day and when the reference NCF issubjected to cross-correlation positive and negative arrival; and the total clock difference is the sum of the static clock difference and the dynamic clock difference. The OBS clock correction method employs the symmetry analysis method of the NCF in each day to obtain the static and dynamic clock difference between the stations so as to solve the clock difference correction problem between theOBSs when the external GPS cannot perform effective time service and in the special condition of nonlinear variation of the clock difference.

The invention discloses a clock synchronization circuit, a clock synchronization method, and an ocean bottom seismograph. The clock synchronization circuit comprises a main clock circuit, at least oneseismic data acquisition circuit, a microprocessor control circuit, and at least two frequency division circuits, wherein the at least two frequency division circuits comprise a first frequency division circuit and a second frequency division circuit; the main clock circuit is used to generate main clock signals; the first frequency division circuit is connected with the main clock circuit, and is used to carry out frequency division processing on the main clock signals to obtain seismic data acquisition clock signals; the seismic data acquisition circuit is connected with the first frequencydivision circuit and used to acquire the seismic data acquisition clock signals; the second frequency division circuit is connected with the main clock circuit, and is used to carry out frequency division processing on the main clock signals to obtain real-time clock signals; and the microprocessor control circuit is connected with the second frequency division circuit and used to acquire the real-time clock signals. The clock synchronization circuit provided by the embodiment of the invention has the advantages of high time accuracy and low power consumption.

The invention belongs to the technical field of ocean equipment, and particularly discloses an ocean bottom seismograph, which comprises a shell, an instrument mounting frame, a monitoring device and an auxiliary recovery device, and the instrument mounting frame comprises a mud blocking plate and a lifting lug; the monitoring device comprises an instrument bin device and an electromagnetic acoustic release device, the electromagnetic release device is provided with a permanent magnet and an electromagnet, and the magnetic force of the electromagnet and the magnetic force of the permanent magnet repel each other; and according to the ocean bottom seismograph adopting the structural design, the counterweight assembly can be efficiently released through the arrangement of the electromagnetic release device, instrument recovery is achieved, meanwhile, electric energy can be saved, and only when the instrument needs to be recovered, the counterweight assembly needs to be released, and then the electromagnet needs to be powered. Besides, through the arrangement of the shell and the instrument mounting frame, various problems caused by the adoption of a traditional glass floating ball mode design are effectively solved, then the resistance of the ocean bottom seismograph is greatly reduced, the noise reduction level is effectively improved, and then the quality of collected data is improved to a certain extent.

The invention discloses ocean bottom seismograph equipment capable of improving a signal-to-noise ratio, and aims to provide ocean bottom seismograph equipment capable of improving the signal-to-noiseratio, which is stable and reliable in structure and can reliably recycle an ocean bottom seismograph. The ocean bottom seismograph equipment comprises a seismograph; a protective shell which is usedfor protecting the seismograph, wherein the seismograph is fixedly installed in the protective shell; a ballast anchor; and a seismograph mounting structure, wherein the seismograph mounting structure comprises a positioning groove which is formed in the ballast anchor and provided with an upward opening, a positioning block which is arranged at the bottom of the protective shell and used for being matched with the positioning groove, a closed cavity formed in the positioning block, an electromagnet arranged in the closed cavity, a battery for providing a power source for the electromagnet and an iron plate embedded in the bottom of the positioning groove. The positioning block is inserted into the positioning groove, the positioning block is tightly attached to the iron plate, and the electromagnet is attracted to the iron plate so that the seismograph, the protective shell and the ballast anchor are tightly connected into a whole.

The invention relates to a roaming type ocean seismograph. The roaming type ocean seismograph comprises a floating ball, a sensing and communication positioning module, an energy module, a low power consumption intelligent control module, and a buoyancy force adjusting module. The energy module and the low power consumption intelligent control module are disposed in the floating ball. The energy module is used to supply other modules with power. The low power consumption intelligent control module is used to process external information received by the sensing and communication positioning module. The sensing and communication positioning module is disposed on the top part of the floating ball, and the buoyancy force adjusting module is disposed on the bottom part of the floating ball. The roaming type ocean seismograph is different from a conventional fixed land seismic station and a conventional submersible ocean-bottom seismograph, and is floated in an ocean, and is used to carry out a floating motion along with ocean current, and therefore the roaming type ocean seismograph is used for the long-time recording of the information transmitted by an earthquake, and is used for recording of seismic signals received from different locations. A seismic network capable of covering a large ocean area is formed, and the problem of the lack of the seismic network in the ocean is solved, and the roaming type ocean seismograph is especially suitable for the tomography and the marine seismic observation of the large area ocean area.

The invention discloses an ocean bottom seismograph arrival time difference positioning device and method, and belongs to the technical field of ocean seismic exploration. The method comprises the following steps: completing submarine seismograph putting according to a predetermined operation point location, and taking artificial seismic source data as input data; firstly, completing preprocessingof artificial excitation source data of the ocean bottom seismograph; taking the putting point as a center, selecting an appropriate radius to define a search grid range, and constructing a search grid point arrival time difference model according to known submarine topographic data and actually measured seawater wave velocity profile joint calculation ray tracing theoretical arrival time; and calculating the actually measured arrival time difference of the seismometer or hydrophone component by using a cross-correlation algorithm; and superposing the theoretical arrival time difference and the actually measured arrival time difference of the search grid node, and superposing to a point position corresponding to the minimum value of the arrival time difference to obtain a positioning result. Meanwhile, the invention discloses an ocean bottom seismograph arrival time difference positioning device. According to the invention, high-precision correction of the landing position of the ocean bottom seismograph can be realized.

The invention provides a dual-clock submarine seismograph data acquisition device and method. The device comprises a power supply module, a storage module, a control module, an atomic clock, a crystaloscillator clock, a data acquisition module, a hydrophone, and a seismograph. According to the invention, by simultaneously adopting two clocks with different precisions, namely an atomic clock and acrystal oscillator clock, the crystal oscillator clock with low precision and low power consumption is used in daily acquisition work, the atomic clock is started only at a set time, the time of theatomic clock and the time of the crystal oscillator clock are compared, the errors of the atomic clock and the crystal oscillator clock are recorded, and the crystal oscillator clock is calibrated, sothat the use power consumption of the atomic clock can be greatly reduced through the collecting method, the clock precision of the collection recording system is improved, the low system power consumption can be maintained, the dual-clock ocean bottom seismograph data acquisition device has high-precision clock information and low power consumption, and the detection capability of the ocean bottom seismograph is enhanced.

The invention discloses a combined type ocean bottom seismograph attitude automatic correction device and method, and belongs to the technical field of ocean seismic exploration. The method comprisesthe steps of taking an active source seismic trace gather recorded by an original attitude as input data, calibrating three-component data to a horizontal attitude by utilizing a pitch angle and a roll angle recorded by an electronic compass assembled in an instrument; then rotating an X component to the direction of a longitudinal measuring line, and calculating a rotation azimuth angle; and solving a final rotation azimuth angle based on a cross-correlation result of a first horizontal component and a vertical component after the initial azimuth angle is rotated. The invention also providesa device for realizing the method. According to the invention, the attitude automatic correction of three-component seismometer trace gather data of a combined type ocean bottom seismograph can be realized, and the data preprocessing rate of the combined type ocean bottom seismograph in ocean energy and resource active source seismic exploration is greatly improved.

According to the thermoelectric energy acquisition system for the ocean optical fiber sensing network, the TEG thermoelectric module is installed in a chassis or a part with large temperature difference of the device, so that the temperature difference between the interior and the exterior of the device is converted into a power supply through the TEG thermoelectric module; and the energy is converted into a power supply suitable for the optical fiber wireless sensor network by using an efficient energy collection circuit and a step-up and step-down module, and then the power supply is supplied to related parts, so that the functions of collecting and utilizing the heat energy dissipated when the optical fiber wireless sensor network works and improving the cruising ability of equipment are realized. The device is applied to the field of ocean optical fiber sensing detection, the cruising ability of an instrument is effectively improved, the energy utilization efficiency is improved, and the problem of observation interruption caused by frequent battery replacement is effectively solved. According to the invention, the huge temperature difference between the inside and outside of the ocean bottom seismograph is used for power supply supplement, the huge temperature difference between the inside and outside of the device is effectively utilized, the cruising ability of the device is improved, and the device is especially suitable for being used under the ocean bottom condition.

The invention relates to the technical field of seismic exploration, in particular to a shock excitation device for seismic exploration in a shallow sea area and a use method thereof.The shock excitation device comprises a shell, a plurality of power assemblies are fixedly connected to the edge of the shell, the power assemblies are in transmission connection with power generation assemblies, the power generation assemblies are electrically connected with a controller, and a diving assembly is fixedly connected to the interior of the shell; and a plurality of linear motion assemblies are fixedly connected to the bottom of the shell, the linear motion assemblies are slidably connected with air gun assemblies, and the controller is electrically connected with the diving assembly and the linear motion assemblies. The shock excitation device is dragged by a traction ship, the depth of the device relative to the sea surface is adjustable, the relative depth of each air gun is adjustable, a three-dimensional air gun array is adopted, the defect that in the prior art, the seismic frequency band is narrow is overcome, low-frequency energy is improved, a seismic source has higher penetrating power, and therefore the quality of data collected by an ocean bottom seismograph (OBS) is improved, in addition, the device does not need a traction ship to provide electric energy and is safe and energy-saving.

The invention discloses an atomic clock-based sinking and floating type ocean bottom seismograph and an atomic clock taming method and belongs to the technical field of ocean bottom seismographs. The atomic clock-based sinking and floating type ocean bottom seismograph comprises a pressure-resistant cabin, a seismic sensor and an atomic clock circuit board, and the atomic clock circuit board is used for providing an effective and credible clock source for the seismograph in a seabed working period to achieve clock correction of data of the seismograph. The method comprises the following steps that: 1, an MCU receives a high-frequency oscillation signal provided by an atomic clock as a clock source for starting; 2, the MCU controls a control selection unit; 3, the MCU performs a screening algorithm on an externally provided PPS to judge the type of an external clock source; 4, the MCU controls the control selection unit; 5, the MCU sets taming parameters to the atomic clock and sends an atomic clock taming starting instruction; 6, in the taming process, the MCU obtains the taming state of the atomic clock; and 7, the MCU sends a taming ending instruction, and atomic clock taming is completed. With the ocean bottom seismograph and the method adopted, the problem of data acquisition clock error of the ocean bottom seismograph can be solved.