CN106680877A - Low-power-consumption wideband single-compartment-ball sea seismograph - Google Patents

Abstract

The invention discloses a low-power-consumption wideband single-compartment-ball sea seismograph which comprises a plastic shell, a glass instrument compartment ball, a variable-buoyancy mechanism and a weight upspring frame. The glass instrument compartment ball is fixedly mounted in the plastic shell, the variable-buoyancy mechanism is positioned at the top end of the plastic shell, and the weight upspring frame is positioned at the bottom end of the plastic shell; the variable-buoyancy mechanism and the weight upspring frame are fixedly connected by a tensioning steel wire to fix the plastic shell in the weight upspring frame. The sea seismograph integrates an independently developed wideband seismograph (30s-100Hz) with a water sound pressure sensor mounted outside an instrument, thereby being capable of realizing multipurpose seaquake detection.

Description

A low-power broadband single-chamber ball submarine seismograph

technical field

The invention belongs to the field of geophysical exploration, and relates to the technical field of marine seismic observation, in particular to a low-power-consumption broadband single-chamber spherical seabed seismograph.

Background technique

Seabed seismographs, especially broadband seabed seismographs, are an indispensable instrument for deep sea exploration, but they have only been disclosed in principle, and there is no public information on the specific implementation structure. It is also difficult to realize the data in the industry. In addition, the introduction of submarine seismographs has been restricted by foreign countries, so that the introduction plans of many earth science research institutes in my country have been put on hold.

Since 2000, with the support of the 863 high-tech plan, the Institute of Geology and Geophysics of the Chinese Academy of Sciences has independently developed a high-frequency submarine digital seismograph and successfully tested it in the South China Sea. The crustal structure of the research area has become a highlight in the "Deep Water Oil and Gas Exploration Technology" project in the 863 High Technology Program. However, with the development of oil and gas exploration to deep water and ocean residual basins and the demand for exploration and research on natural gas hydrates, the requirements for the performance indicators of submarine digital seismometers are also getting higher and higher. The efficiency needs to be further improved and the continuous working time needs to be longer.

Therefore, it is urgent to further develop and innovate the original instrument.

Contents of the invention

Based on the lack of technology in the original research, the applicant invested huge manpower and material resources. On the basis of the original research, a low-power broadband single-chamber spherical submarine seismograph was proposed. Based on the functional submarine seismograph, it is developed through continuous research and digestion and improvement of related technologies, which improves the performance index and can meet the needs of marine scientific research and marine oil and gas detection. Specifically, the low-power consumption broadband single-chamber spherical seabed seismograph of the present invention is used for seabed seismic observation and geological exploration, and it includes a plastic shell, a self-floating mechanism and a counterweight pop-up frame, and the top of the glass cabin ball in the plastic shell is installed. There are underwater acoustic pressure sensors, multi-channel digital collectors, self-made broadband seismometers, underwater acoustic communication circuit modules, wireless beacons, GPS, WIFI modules, electronic compass and combined power supplies are installed inside; the self-floating mechanism is fixed on the plastic The top of the shell is connected to the counterweight pop-up frame through multi-strand tension steel wires made of 316L. When the instrument is recovered, the instrument will float up and recover naturally after the steel wire is fused through the principle of electric corrosion. The counterweight pop-up frame provides a stable base for the submarine seismograph when it is working, and provides an upward elastic force at the moment of flotation, which helps the instrument to float smoothly. The invention integrates a self-developed broadband seismometer (30s-100Hz) and a hydroacoustic pressure sensor installed outside the instrument, and can realize multipurpose seabed seismic detection.

More specifically, according to the technical solution of the present invention, a low-power consumption broadband single-chamber ball submarine seismograph is provided, which includes a plastic shell, a glass instrument cabin ball, a self-floating mechanism, a counterweight bounce frame; a glass instrument cabin The ball is fixed in the plastic shell, the self-floating mechanism is located at the top of the plastic shell, and the counterweight pop-up frame is located at the bottom of the plastic shell; the self-floating mechanism and the counterweight pop-up frame are fixed with tension steel wires, and the plastic shell compartment Fixed in the counterweight frame; the internal battery packs are installed in six arc-shaped battery boxes and fixed on the fixed support ring, two sets of batteries are placed on one side of the digital transmission antenna, and four sets of batteries are fixed on the opposite side for adjustment The overall floating posture of the instrument; the self-made broadband seismometer is suspended on four bearings through a universal device, and the bearing frame is made of mold injection, which ensures the consistency of bearing positioning, flexible rotation, and more accurate angle measurement. The working angle of the gimbal can freely rotate up to 30 degrees. It is assembled and debugged outside the glass instrument cabin sphere, and then the tested instrument is put into the glass cabin sphere. The four open buffer slots on the cover are matched to fix the internal device inside the glass cabin ball; the broadband seismometer and the underwater acoustic pressure sensor, two instruments with different working frequency bands are controlled by the multi-channel digital acquisition system for four sets of data Acquisition, which enables the instrument to record both natural seismic signals and artificial source signals.

Among them, the broadband seismometer is self-developed, which is based on the 2.0Hz geophone and the feedback circuit to expand the broadband seismometer. The three-component geophone is assembled in the seismometer shell formed by mold injection, and the volume and weight Compared with the chemical seismometer of the prior art, it is reduced by one time. The height has also changed from the original 160mm to the current 90mm, while lowering its center of gravity. Small size and low center of gravity. The communication mode between the low-power consumption broadband single-chamber spherical seabed seismograph and the upper computer adopts the wifi interactive mode.

The low-power broadband single-chamber submarine seismograph uses the smallest ARM processor with the lowest power consumption of only 9μA/MHz, and the improved design of the external circuit makes the acquisition power consumption of the whole machine reach 150mw. The power consumption of some submarine seismographs with more than four channels has been doubled, and the working time of single-chamber spherical instruments can reach 2 years. The low-power broadband single-chamber spherical seabed seismograph uses four positioning columns to match the four corresponding opening buffer slots installed on the upper cover, and continuously compresses and expands the opening at the moment when the upper and lower hemispheres are buckled. , can ensure a certain adjustable distance, and can fix the internal whole so that it will not rotate and sideways. The counterweight pop-up frame is made of steel material with anti-rust paint on the surface. There are four plastic columns on the disc in the middle of the bracket, and four springs are installed on each plastic column. When the instrument floats up, it provides the necessary elastic force for The instrument can float up smoothly without being trapped by the surrounding silt, ensuring the smooth recovery of the instrument.

Compared with the original submarine seismograph, the low power consumption broadband single-chamber ball submarine seismograph of the present invention has very obvious technical advantages, mainly in: 1. The internal structure is integrated, which greatly improves the manufacturing time and workload. The reduction is simple and convenient to operate, and the additional vibration is reduced. Its core component, the gimbal device, is molded by mold injection, with good consistency and high bearing installation accuracy, which makes the angle measurement of the internal seismometer more accurate. In addition, the self-made broadband seismometer is small in size and low in the center of gravity, reducing additional vibration and improving its work. stability, and data quality.

2. The fixing method of internal integrated parts adopts the method of positioning column and buffer groove, which can adjust the gap caused by installation error without being too loose, making the structure compact and easy to install. However, the O-ring fixing method used by the original seven-channel multi-functional seabed seismograph has certain defects. Due to the limited compression of the O-ring, the error caused by the assembly of the instrument cannot be compensated, and the internal structure cannot be easily compressed by the glass ball. The tightness caused tilting during subsea work, and the recorded data could not be used.

3. The service life of the self-made seismometer is also greatly extended than the five-year service life of the chemical seismometer used by the original seven-channel multifunctional seabed seismometer, and it is easy to maintain and is not subject to the blockade of foreign technology. The low-power broadband single-chamber ball submarine seismograph collects seismic data with four channels, and the self-developed seismometer has low power consumption, so that the acquisition power consumption of the whole machine is only 150mw. WIFI is used for on-site detection to ensure the signal integrity during interaction. Stability and strong control sensitivity. The low-power broadband single-chamber spherical submarine seismograph can perform continuous seismic observation operations at sea for many times, breaking the monopoly of foreign countries on broadband submarine seismographs.

Description of drawings

Fig. 1 is the structural diagram of the gimbal device of the low power consumption broadband single-chamber spherical seabed seismograph of the present invention.

Fig. 2 is a schematic diagram of the self-floating mechanism of the low-power broadband single-chamber spherical seabed seismograph of the present invention.

Fig. 3 is a schematic diagram of the fuse wire winding of the self-submerging and floating mechanism of the low-power broadband single-chamber spherical seabed seismograph of the present invention.

Fig. 4 is a three-dimensional structure diagram of the appearance of the low-power broadband single-chamber spherical seabed seismograph of the present invention.

Fig. 5 is a schematic diagram of the general structure of the low-power broadband single-chamber spherical seabed seismograph of the present invention.

Fig. 6 is a schematic diagram of the counterweight bounce-up frame of the low-power broadband single-chamber ball submarine seismograph of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

A low-power broadband single-chamber ball submarine seismograph, including a plastic shell, a glass instrument pod, a self-floating mechanism, and a counterweight pop-up frame; the glass instrument pod is fixed in a plastic shell, and the self-floating mechanism is located in the plastic shell At the top, the counterweight pop-up frame is located at the bottom of the plastic shell; the self-floating mechanism and the counterweight pop-up frame are fixed with tension steel wires, and the submarine seismograph is fixed in the counterweight pop-up frame; the internal batteries are respectively Installed in six arc-shaped battery boxes and fixed on the fixed support ring, two sets of batteries are placed on one side of the digital transmission antenna, and four sets of batteries are fixed on the opposite side, so as to adjust the overall floating attitude of the instrument; self-made broadband earthquake The meter is suspended on four bearings through a universal device, which can rotate freely, and the working angle can reach 30 degrees. It is assembled and debugged outside the glass instrument cabin ball, and then the tested instrument is put into the glass cabin ball and fixed inside the ball. The device uses four positioning columns to match the four corresponding opening buffer slots installed on the upper cover. At the moment when the upper and lower hemispheres are buckled, the opening is continuously pressed and enlarged to ensure a certain adjustable distance and to fix the overall internal use. It will not rotate and sideways; broadband seismometer and underwater acoustic pressure sensor, two instruments with different working frequency bands are collected by a four-channel digital acquisition system to collect four sets of data, so that the instrument can record natural seismic signals and artificial source signals .

Said submarine seismograph, said self-submerging and floating mechanism is a double-layer structure, including stainless steel screw column, screw support plate, and wire-wound fixing plate, wherein, the sheet-shaped ring-shaped wire fixing plate and the sheet-shaped ring screw support plate are up and down. They are arranged in parallel, and the two are fixed with a plurality of stainless steel screws. The upper ends of the two screws on the diameter extend out from the upper surface of the fixing plate to connect with each other to form a hook; the diameter of the inner hole of the screw support plate is the same as the top of the plastic shell. The diameter of the outer circle is suitable; the surface of the sheet-shaped wrapping wire fixing plate is provided with a positive pole, a decoupling slider, a wire-wound nail, and a negative pole. The lock nut is screwed behind the gasket, and the negative electrode is sleeved with the negative electrode protective sleeve; at both ends in the diameter direction perpendicular to the diameter direction formed by the positive electrode and the negative electrode, there are grooves towards the center of the circle on the periphery of the fixing plate. There is a decoupling slider in each groove. The L-shaped decoupling slider is matched with the groove. There is a solid interface in the middle of the fixed wall protruding upwards. Nails and an imprisoning screw; on the surface of the fixed plate are also provided with a number of coiled nails, the coiled nails are evenly distributed, and the distribution position forms a circular ring with the position of the positive pole and the negative pole; a fuse wire passes through the positive pole and sequentially through all The wire-wound nails are wound into a ring, and fixed and positioned with the lock nut and the wire-wound nails, the decoupling slider is fixed on the fixed plate, and the fuse wire is in contact with the two negative poles; the seabed seismograph is placed in a plastic pop-up frame , the self-floating mechanism is placed on the top of the plastic shell, and the inner hole of the screw support plate is connected to the top of the plastic shell. After winding multiple tension steel wires around the fixed interface of the decoupling slider, multiple locking bolts are used to tighten the multiple tension wires. Tighten the steel wire to fix the plastic shell; after fixing the plastic shell, remove the confinement screw on the decoupling slider, and then use the locking bolt to tighten the steel wire to adjust the tightness of the instrument cabin; Electric corrosion fuses the steel wire, the decoupling slider is pulled off by the tension steel wire, and the instrument cabin is floated up by seawater buoyancy for recovery.

In the submarine seismograph, the counterweight pop-up frame is made of steel material with anti-rust paint on the surface, and four plastic columns are installed on the disc in the middle of the bracket, and four springs are installed on each plastic column. , when the instrument floats up, the necessary elastic force is provided so that the instrument can float up smoothly without being trapped by the surrounding silt, so as to ensure the smooth recovery of the instrument. The counterweight pop-up frame is closely connected with the self-floating mechanism through corrosion-resistant tension steel wires. Its weight and volume are suitable for controlling the sinking speed and sinking attitude during the sinking process, and provide a stable base for the seismograph to work on the seabed. After the instrument floats, the counterweight pops up and is discarded in the seawater. Said submarine seismograph, said self-made broadband seismometer is 30S-100Hz.

The present invention will be described in detail below in conjunction with accompanying drawings 1-6. Please refer to FIG. 1 to FIG. 6 , which are structural schematic diagrams of the low-power broadband single-chamber spherical seabed seismograph of the present invention. Among them, self-floating mechanism 1, plastic shell 2, tension steel cable 3, coupling ring 4, counterweight pop-up frame 5, locking bolt 6, underwater acoustic pressure sensor 7, vacuum nozzle 8, glass instrument cabin ball 9, Buffer tank 10, positioning column 11, electronic circuit board 12, gimbal device 13, lower shell 14, unhook slider 15, fuse wire 16, fuse wire fuse point (two places) 17, positive pole 18, lock nut 19, pressure wire Gasket 20, stainless steel stud 21, screw support rod 22, threaded nail 23, stainless steel hook 24, threaded fixing plate 25, negative electrode 26, negative electrode protective cover 27, spring 28, plastic column 29, attitude sensor 30, bearing Seat 31, bearing 32, arc-shaped battery box 33, fixed ring 34, seismometer shell 35, DC motor 36, gimbal ring 37, digital transmission antenna 38, frequency expansion circuit board 39, safety ring 40, GPS antenna 41, concave Groove 251, fixed wall 151, solid interface 152, base 153, confinement screw 154.

The low-power broadband submarine seismograph of the present invention is composed of three parts: an instrument cabin, a self-floating mechanism 1 and a counterweight pop-up frame 5 .

1. Glass instrument cabin ball:

The instrument cabin is made up of a plastic shell 2 and a glass instrument cabin ball 9. The instrument cabin is a recyclable part of the submarine seismograph. The glass instrument cabin ball is a protective cover inside the plastic shell. The glass instrument cabin ball adopts a single-ball integrated structure. The fixing method of internal integrated parts adopts the method of positioning column and buffer groove, which can adjust the gap caused by installation error without being too loose, making the structure compact and easy to install. However, the O-ring fixing method used by the original seven-channel multi-functional seabed seismograph has certain defects. Due to the limited compression of the O-ring, the error caused by the assembly of the instrument cannot be compensated, and the internal structure cannot be easily compressed by the glass ball. The tightness caused tilting during subsea work, and the recorded data could not be used.

mainly includes:

(1) Underwater acoustic communication module

Using 8-bit FSK digital encoding. The demodulation circuit of FSK encoding includes several parts such as amplitude detection, phase detection, voltage-controlled oscillator, and comparison output device. The basic principle is: according to the phase difference between the input signal and the local oscillator signal, the voltage-controlled oscillator is controlled to adjust the local oscillator frequency within a relatively narrow bandwidth (about 400Hz). If the input signal frequency is consistent with the local oscillator frequency, the phase difference is Zero, the frequency of the local oscillator is locked, then the output of the encoding and demodulation circuit is low level, otherwise it is high level. The local oscillator frequencies of the two coding and demodulation circuits are 10KHz and 12.5KHz respectively, and are used to detect whether the signal contains a corresponding frequency signal.

The reverberation problem of underwater acoustic transmission is solved by first wave extraction. The principle is that the deck machine sends an encoding frequency every 100 milliseconds, and the duration is about 10 milliseconds. The underwater acoustic communication module at the receiving end closes the signal channel within 10 milliseconds after receiving the first encoded frequency signal. Afterwards, the signal channel is opened every 100 milliseconds for signal demodulation, and the duration is 10 milliseconds, and then the signal channel is closed until the end of the code byte.

In order to prevent amplifier saturation, a single-T network frequency selective amplifier with a bandpass frequency of 10-12.5KHz is designed, so that signals outside the signal frequency band can be effectively suppressed.

The matching design of underwater acoustic emission and transducer is mainly considered from two aspects of impedance matching and tuning matching, and measures are taken to protect the push-pull power amplifier tube.

(2) Flat device

The gimbal device is made of mold injection molding, with good consistency and high bearing installation accuracy, which makes the angle measurement of the internal seismometer more accurate and reduces additional vibration.

Its working method is as follows: the broadband seismometer is placed on the gimbal ring 37, and then the whole is fixed on the bearing seat 31 of the gimbal device through bearings. Both the bearing seat and the gimbal ring are processed by molds, which have good consistency and reduce installation difficulty. The glass instrument cabin ball 9 is rigidly connected to the broadband seismometer, and the center of gravity of the self-made broadband seismometer is lowered so as to ensure the low distortion transmission of the ground motion signal and the accuracy of attitude adjustment. After the seabed seismograph landed on the seabed, the attitude sensor 30 sensed that the seabed attitude was balanced, and the broadband seismometer was pulled up by the direct current motor 36 positioned at the top of the gimbal ring 37 to break away from the glass instrument cabin ball 9 and adjust to the level by its own weight, and Put it back on the bottom of the glass cabin ball and apply pressure to fix it.

The gimbal 13 combines the battery pack, the broadband seismometer, and the electronic circuit 12 into a whole, forming the integration of the internal structure. The instrument assembly and debugging work can be completed outside the pressure-resistant glass instrument cabin ball 9. The glass instrument cabin ball 9 can be regarded as only a casing, and the tested submarine seismograph is put into the glass instrument cabin ball 9 to complete the assembly. This structure also reduces additional chatter of the instrument.

(3) Using self-made broadband seismometer

In the submarine seismograph, we have integrated a broadband seismograph, which is a self-developed broadband seismograph to replace the previous electrochemical energy conversion seismometer. The main improvement is to adjust the parameters through the feedback circuit to expand the frequency detector of the 2Hz natural frequency. into a broadband seismometer.

The service life of the self-made broadband seismograph is also much longer than the five-year service life of the chemical seismometer used in the original seven-channel multi-functional submarine seismograph, and it is easy to maintain and is not subject to the blockade of foreign technology. The low-power broadband single-chamber ball submarine seismograph collects seismic data with four channels, and the self-developed seismometer has low power consumption, so that the acquisition power consumption of the whole machine is only 150mw. WIFI is used for on-site detection to ensure the signal integrity during interaction. Stability and strong control sensitivity. The low-power broadband single-chamber spherical submarine seismograph can perform continuous seismic observation operations at sea for many times, breaking the monopoly of foreign countries on broadband submarine seismographs.

(4) Collector system

a) The pre-amplifier circuit adopts the form of the amplifier circuit recommended by the manufacturer, and a first-order passive LC low-pass anti-aliasing filter is added to the signal input end, and an extremely low-noise precision dual operational amplifier is used to form an instrument amplifier circuit with a gain of 30dB. Noise referred to the input is 0.4µV (peak-to-peak). Has a high anti-interference ability.

b) The instrument uses an oscillation circuit composed of a temperature-compensated crystal oscillator as an internal clock, and its accuracy is better than that in the temperature range of 0 ^o C to 4 ^o C. The main factor affecting the frequency accuracy of the quartz crystal is temperature, and the temperature of the seabed is relatively constant. At a depth of 2000 meters, the annual temperature change is only 0.5 degrees, so the clock accuracy can be effectively guaranteed. In order to reduce the noise of the circuit board, all the clocks of different frequencies required by the system (mainly the analog-to-digital conversion clock and the microcontroller clock) are obtained by dividing the same clock frequency.

c) Data storage adopts SD (Secure Digital) card widely used in digital cameras and players, with a unified interface, and the capacity can be expanded from 16G to 32G or higher.

d) Adhere to the principle of micro-power consumption design in circuit design; for the purpose of system power consumption and micro-power consumption, the hardware circuit design of the data collector complies with the following principles: (1) use CMOS devices, (2) use 1.8V , 3V and 5V single power supply low-voltage power supply; (3) The digital circuit uses a lower frequency working clock as much as possible; (4) Minimize the reactive power consumption of the system, and the overall power consumption is <0.3W.

f) The A/D conversion of the collector adopts the 4th-order Σ-Δ type ADS1251 incremental modulator, the AD clock is output by the frequency division of the single-chip microcomputer LPC2103, and the function of digital filtering is completed by software programming. Every time AD completes a conversion, the microcontroller is triggered to generate an interrupt, and the interrupt program of the microcontroller reads the AD data into the memory. This method can not only obtain sufficient dynamic range (>120dB) on the basis of reducing power consumption and size, but also dynamically adjust its frequency-phase characteristics according to different actual needs. The control module adopts ARM7 core high-performance single-chip microcomputer (LPC2103 of NXP Company). The working voltage is 3.3/1.8V, the main frequency is 60M, and it controls the work of other modules such as storage and communication while completing A/D conversion and digital filtering. The microcontroller works in idle mode (idle mode), interrupt-driven mode.

g) The controller is connected with 7 identical AD modules (the 1st-3rd channel is connected to the broadband seismometer, the 4th-6th channel is connected to the high-frequency geophone, and the 7th channel is connected to the hydrophone channel), through the multi-way switch (MAX4052) to switch, use the GPIO pin of the microcontroller as the address line to strobe and read the AD data of channels 1-7.

(5) Seismograph power supply

The battery of the seabed seismograph is a 10AH lithium battery, and each set of instruments is equipped with 16 groups. Each lithium battery has a separate protector, and the seismograph detects the charge and discharge status and voltage of each battery through a single-chip microcomputer, and can display it through an interactive interface. Charging is carried out through the socket on the pod ball, and the user can know the charging power of each battery, charging time and other information. The user can complete the charging of the submarine seismograph within tens of hours through the dedicated charger. Users can grasp the battery voltage status before and after charging, charging power and other information during each charging operation, and can find out the failure or performance degradation of the battery in time. In this way, the failed battery can be replaced in time, or the working time of the instrument on the seabed can be shortened according to the performance degradation of the battery.

The built-in power management module can monitor the power storage of the battery in real time. When the energy is lower than a predetermined value, the seismograph will turn off all power-consuming equipment except underwater acoustic communication, so that the seismograph will stay on the seabed for more than a year. It can still be recovered normally.

(6) Data extraction method

In order to ensure the smooth progress of multiple operations at sea, the data extraction module must be easy to operate and require a relatively fast transmission speed. The USB interface module is embedded in the OBS for high-speed data exchange with the PC, and the OBS data extraction can be realized at a relatively high speed (2M bytes/second) without opening the pod.

(7) Wireless data transmission module

The wireless data transmission module adopts OEM products. Its transmission power is 1~5W, and the effective distance is about 5-10Km. The positioning accuracy can reach within tens of meters. Considering the space limitation of the wireless data transmission module built into the glass cabin ball, a 50 ohm 450MHz whip-mounted rubber antenna is used to match the transmitter, and the receiving system is almost not limited by space, so a 50 ohm 12dB high-gain antenna is used to match the receiver. The modulation method of the wireless data transmission module adopts FSK (frequency shift keying) method, which has strong anti-interference ability. In order to further improve the anti-interference ability of equipment, the communication speed adopts a lower 1200bps. The communication protocol is RS232 format: 1 start bit, 8 data bits, even parity, 1 stop bit.

The transmission distance is very sensitive to the antenna height of the transmitter. Since the transmitter antenna is built into the ball, the installation height is extremely limited. To this end, take the following measures: (a) reduce the recovery weight (b) install the antenna close to the wall of the ball (c) make the antenna on the top of the ball during recovery through the counterweight.

The use of interleaving coding technology can effectively reduce the bit errors caused by sudden interference. The principle is to arrange the numbers to be sent into a matrix in columns and then send them in the order of rows. If continuous bit errors occur in the channel due to sudden interference, the solution Interleaved code errors are distributed to different code words, which can be effectively corrected by BCH.

The synchronization mechanism is used to reduce the preamble synchronization code, which effectively reduces the transmission time and improves the transmission efficiency; avoids the "polarization phenomenon" caused by continuous high-current discharge of the battery. Specifically, the start time of each transmission and reception is determined by the edge of the GPS output PPS.

(8) Strobe lights

When the instrument floats up, the strobe light can effectively indicate the position of the instrument in the dark for easy recovery. The strobe light is placed on the upper part of the hyperbaric chamber ball and controlled by a water pressure switch. When the instrument floats up, the water pressure decreases and the strobe light works. The light source adopts a high-brightness light-emitting diode with high luminous efficiency and good penetrability. It can work continuously for more than 12 hours.

2. Self-submerging and floating mechanism:

The self-sinking and floating mechanism 1 is a double-layer structure, including a stainless steel screw post 21, a screw support plate 22, and a wire-wound fixing plate 25, wherein the sheet-shaped wrapping wire fixing plate 25 and the sheet-shaped ring screw support plate 22 are arranged in parallel up and down, so as to A plurality of stainless steel screw columns 21 are fixedly connected to the two, and the upper ends of the two screw columns 21 on the diameter extend out from the upper surface of the fixing plate 25 to connect with each other to form a suspension hook 24; 2 The top outer circle diameter matches.

The upper surface of sheet-shaped wrapping wire fixing plate 25 is provided with positive pole 18, decoupling slider 15, winding wire nail 23, and negative pole 26. Screw the locking nut 19 after the wire pressing gasket 20 is sleeved, and the negative pole protective sleeve 27 is sleeved on the negative pole 26; on the two ends in the diameter direction perpendicular to the diameter direction formed by the positive pole 18 and the negative pole 26, on the periphery of the fixed plate 25 There is a groove 251 toward the center of the circle, and a decoupling slider 15 is provided in each of the two grooves 251. The L-shaped decoupling slider 15 is compatible with the groove 251. There is a fixed interface 152 in the middle of the fixed wall 151 protruding upward. The solid interface 152 is used for the tension steel wire 3 to be wound and connected, and its base 53 is provided with a plurality of wire-wound nails 23 and a confinement screw 154; Evenly distributed, the distribution position and the position of the positive electrode 18 and the negative electrode 26 form a circular ring.

A fusing steel wire 16 is looped through the positive pole 18 and all the wire-wrapping nails 23 sequentially, and fixed and positioned with the lock nut 19 and the wire-wrapping nails 23, the decoupling slider 15 is fixed on the fixing plate 25, and the fusing steel wire 16 It is in contact with the two negative poles 26; the two negative poles 26 are the two fusing points 17.

Place the plastic shell 2 in the counterweight pop-up frame 5, place the self-floating mechanism 1 on the top of the plastic shell 2, connect the inner hole of the screw support plate 22 with the top of the plastic instrument cabin 2, and wind it with multiple tension steel wires 3 After the fastening interface 152 of the slider 15 is unhooked, a plurality of tensioning steel wires 3 are tightened with a plurality of locking bolts 6 to fix the plastic casing 2 .

After fixing the plastic shell 2, unload the confinement screw 154 on the unhook slider 15, and then use the locking bolt 6 to tighten the steel wire 3 to adjust the tightness of the instrument cabin 2; The fusing point 17 is electrocorroded to fuse the steel wire 16, and the decoupling slide block 15 is pulled off by the tension steel wire 3, and the instrument cabin 2 floats up using seawater buoyancy for recovery.

(1) The wire-wound fixing plate 25 is made of engineering plastic nylon with high mechanical strength, high rigidity and strong toughness, and is not easily deformed or corroded in water.

(2) The threaded nail 23 is a key part of the self-floating mechanism, so we use 316L special stainless steel, which has better corrosion resistance to seawater and various corrosive media than ordinary stainless steel.

(3) The fuse steel wire 16 is the core component of the entire self-floating mechanism. The 316 corrosion-resistant steel wire we choose is made of 7 bundles of 49 strands of thin steel wire through special processing, which is easy to bend and soft. It does not appear too rigid like a single-strand steel wire when bent, and it will cling to the wire-wrapped nail when pulled tight.

3. Counterweight pop-up frame:

The self-floating mechanism 1 is an important component in the recovery process of the instrument, and the assembly and debugging of the mechanism can be carried out indoors and passed the test before it can be installed and used. The tested self-floating mechanism is fixed on the upper part of the instrument cabin 2 by 8 sets of stainless steel screws, which can be easily assembled. The processing technology and material selection of the parts in the mechanism can ensure long-term work in seawater, and at the same time, the steel wire can be fused within 5 minutes after receiving the instruction. The whole process takes no more than 10 minutes until the instrument is recovered.

The counterweight pop-up frame 5 is made of steel material with anti-rust paint attached on the surface. Four plastic columns 29 are installed on the disc in the middle of the bracket, and four springs 28 are installed on each plastic column. When the instrument floats up instantly, provide The necessary elastic force allows the instrument to float up smoothly without being trapped by the surrounding silt, so as to ensure the smooth recovery of the instrument.

The counterweight pop-up frame is closely connected with the self-floating mechanism through corrosion-resistant tension steel wires. Its weight and volume are suitable for controlling the sinking speed and sinking attitude during the sinking process, and provide a stable base for the seismograph to work on the seabed. After the instrument floats, the counterweight pops up and is discarded in the seawater.

Using a dynamic process:

After choosing the location and orientation of the launch, the submarine seismograph is placed on the seabed. After the instrument touches the ground, the sonar system is used for accurate positioning immediately. When the internal attitude sensor 30 perceives that the attitude of the seabed is leveled, the broadband seismometer is pulled up by the direct current motor 36 positioned at the top of the gimbal to break away from the glass cabin ball 9, and is adjusted by the stepping motor 1 according to the signal of the attitude sensor 30. To the level and put it back to the bottom of the glass cabin ball 9 and pressurize and fix it. After that, the internal seismometer and digital collector enter the working state at the same time, continuously record the seabed disturbance and seismic signals, and store them in the internal memory.

When the instrument needs to be recovered, a recovery signal is sent through the sonar system in the sea area near the position of the instrument. After the instrument receives the signal, it starts to fuse the steel wire, and the instrument cabin is separated from the counterweight pop-up frame 28 in about 5 minutes, and automatically floats to the water surface. , after surfacing, send its location information through wireless 33, determine the orientation of the instrument according to the information or visual inspection, and salvage it on board. The recorded data is then extracted for analysis and research.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone familiar with the technical field can easily think of Changes or substitutions should fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (8)

1. a kind of low-power consumption broadband list cabin ball submarine seismograph, it includes cabinet, glass apparatus cabin ball, from sink-float machine Structure, counterweight are upspring frame；It is characterized in that：Glass apparatus cabin ball is installed in cabinet, and float means of drowning oneself are located at cabinet Top, counterweight upsprings frame positioned at cabinet bottom；Drown oneself float means and counterweight upspring it is affixed with taut wire between frame, will Cabinet cabin is fixed in counter-balanced carriage.

2. low-power consumption broadband list cabin as claimed in claim 1 ball submarine seismograph, it is characterised in that：Internal battery is distinguished It is mounted in six arc battery cases, is fixed on fixed backing ring, wherein two Battery packs are placed in number passes antenna side, four Battery packs Fix over there, to adjust the overall floating attitude of instrument；Broadband seismometer is suspended on four bearings by universal head On, bearing bracket stand is formed using mold injection, it is ensured that the concordance of bearing positioning, flexible rotation, angular surveying is more accurate.

3. low-power consumption broadband list cabin as claimed in claim 1 or 2 ball submarine seismograph, it is characterised in that：Gimbal freedom The operating angle of rotation is assembled outside the ball of glass apparatus cabin, debugged up to 30 degree, then puts in the instrument that test is completed In the ball of glass cabin, match with four opening dashpots on spherical cap with locating dowel by be evenly distributed on circuit support plate four, Interior arrangement is fixed on inside the ball of glass cabin；Broadband seismometer and underwater sound pressure transducer, two kinds of different operating frequency bands Instrument is acquired by multi-channel digital acquisition system to four groups of data, makes instrument be able to record that earthquake signal and artificial Source signal.

4. the low-power consumption broadband list cabin ball submarine seismograph as described in claim 1 or 2 or 3, it is characterised in that：The wideband It is that the broadband seismometer that feedback circuit spreads is increased based on 2.0Hz cymoscopes with seismometer, three-component geophone collection is mounted in The seismometer inside the shell of mold injection；Height 90mm.

5. low-power consumption broadband list cabin as claimed in claim 1 ball submarine seismograph, it is characterised in that：The instrument and host computer Communication modes adopt wifi interactive modes.

6. low-power consumption broadband list cabin as claimed in claim 1 ball submarine seismograph, it is characterised in that：Low-power consumption broadband list Cabin ball submarine seismograph adopts power consumption for the arm processor of 9 μ A/MHz, and whole machine collection power consumption reaches 150mw.

7. low-power consumption broadband list cabin as claimed in claim 1 ball submarine seismograph, it is characterised in that：Ball inner fixing device is adopted Matched with four locating dowels dashpots that are open corresponding with four that upper lid is installed, in the moment of upper and lower hemispheres make-up, constantly Compress enlarged openings, you can guarantee certain Adjustable Range, it is not rotated and is slanted with fixing internal again.

8. low-power consumption broadband list cabin as claimed in claim 1 ball submarine seismograph, it is characterised in that：The counterweight is upspring Frame, is made using the ferrous materials of surface attachment antirust paint, in the bracket between disk on be equipped with four plastic columns, every plastics Post four springs installed above, when instrument floats moment, there is provided necessary elastic force can smoothly float so as to instrument, not by surrounding Mud stick, it is ensured that instrument is smoothly reclaimed.