CN210129046U - Seabed permanent fixed optical fiber seismograph - Google Patents
Seabed permanent fixed optical fiber seismograph Download PDFInfo
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- CN210129046U CN210129046U CN201921228439.4U CN201921228439U CN210129046U CN 210129046 U CN210129046 U CN 210129046U CN 201921228439 U CN201921228439 U CN 201921228439U CN 210129046 U CN210129046 U CN 210129046U
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Abstract
The utility model discloses a seabed permanent fixed optical fiber seismograph, relate to seismograph technical field, this seismograph adopts the seismic sensor of three-dimensional optical fiber sensor technique to replace traditional electronic type, strengthen seismic signal coupling intensity through the coupling base, installation demodulation unit and data acquisition card realize signal digital quantization acquisition and signal demodulation, adopt high-speed digital network bridge to carry out data remote transmission, adopt time service synchronization module to carry out the synchronous real-time correction that realizes time synchronization of network time service, and have uninterrupted power source power supply function, install the power communication watertight connector on the end cover, can plug into the circular telegram that the box realized the seismograph through power watertight communication cable junction, communication and time service are synchronous, can realize that the seismograph uses in seabed unmanned on duty, satisfy application demands such as permanent laying and long-term monitoring and have sensitivity height, Wide response frequency band, large dynamic range, high synchronization precision and the like.
Description
Technical Field
The utility model belongs to the technical field of the seismograph technique and specifically relates to a permanent fixed optic fibre seismograph in seabed.
Background
At present, China lacks an effective detection means for detecting marine artificial seismic sections and observing seabed natural earthquakes. The traditional ocean bottom seismograph adopts a self-contained self-sinking and self-floating structure, and data can be read only by periodically recovering equipment, so that the requirement of long-term continuous observation cannot be met. In addition, the measurement sensitivity, the measurement frequency band and the dynamic range of the electronic displacement conversion device adopted by the traditional ocean bottom seismograph reach the limit, and the requirements of further development of seismic monitoring and seismic measurement cannot be met. The fiber-optic ocean bottom seismograph (CN10179955A) proposed by the semiconductor research institute of China academy of sciences, Ontan et al adopts a fiber grating accelerometer as a sensor of the seismograph, and a tail fiber of the sensor is connected with a communication optical cable. A seabed earthquake monitoring device and a seabed earthquake monitoring system (CN208705483U) based on seabed Internet of things are provided by Pengyao et al, the IEEE1588 standard is adopted to realize network time synchronization through an optical cable, the time precision is only millisecond level, the high-precision positioning requirement cannot be met, and the wet-pluggable optical fiber composite watertight connector is adopted for connecting the optical cable and the watertight cabin, so that the cost is high.
SUMMERY OF THE UTILITY MODEL
The invention provides a seabed permanent fixed optical fiber seismograph aiming at the problems and the technical requirements, and the seismograph can meet the application requirements of high sensitivity, wide response frequency band, large dynamic range, long-term monitoring and the like.
The technical scheme of the utility model as follows:
a permanently fixed fiber optic ocean bottom seismograph, comprising: the system comprises a watertight cabin, a coupling base, a triaxial optical fiber sensing unit, a data acquisition card, a demodulation unit, a communication control unit, a battery and a power supply;
the watertight cabin comprises a cabin body and an end cover, wherein the end cover is fixed on the cabin body, radial and axial watertight treatment is carried out between the cabin body and the end cover, a power supply communication watertight connector is mounted on the end cover and comprises a group of power supply terminals and a group of communication terminals, and the power supply communication watertight connector is used for being connected with the seabed connection box through a power supply communication watertight cable; the watertight cabin body is fixedly assembled on a coupling base, the coupling base is arranged on the sea bottom, and hoisting rings are respectively fixed on two sides of the coupling base;
the three-axis optical fiber sensing unit, the data acquisition card, the demodulation unit and the communication control unit are respectively arranged in a cabin body of the watertight cabin, the communication control unit comprises a high-speed digital bridge, a control circuit board and a time service synchronization module, a three-axis electronic compass is integrated on the control circuit board, the data acquisition card is connected with the three-axis optical fiber sensing unit, the data acquisition card is also connected with the demodulation unit, the control circuit board and the time service synchronization module are respectively connected with the high-speed digital bridge through RJ45 network cables, and the high-speed digital bridge is connected with a communication terminal of the power supply communication watertight connector through a double;
the battery and the power supply are fixed on the inner side of the end cover, the battery and the power supply form an uninterruptible power supply, one input channel of the power supply is connected with a power terminal of the power supply communication watertight connector, the other input channel of the power supply is connected with the battery, and the output of the power supply is respectively connected with the triaxial optical fiber sensing unit, the data acquisition card, the demodulation unit and the communication control unit for supplying power.
The technical scheme is that the three-axis optical fiber sensing unit comprises a sensing unit shell and three one-dimensional sensing units integrated in the sensing unit shell, each one-dimensional sensing unit is realized by adopting an optical fiber Michelson interferometer, and the three one-dimensional sensing units are respectively arranged on the sensing unit shell in a pairwise orthogonal mode.
The further technical scheme is that a spare watertight connector is further mounted on the end cover, the spare watertight connector is connected with the high-speed digital bridge through a twisted-pair communication line, and the spare watertight connector is used for being connected with the underwater environment monitoring sensor.
The technical scheme is that a temperature and humidity pressure sensor is further integrated on a control circuit board of the communication control unit and used for collecting environmental parameters inside a cabin body of the watertight cabin.
The further technical scheme is that the diameter of a cabin body of the watertight cabin is 450mm, the length of the cabin body is 600mm, the height of the coupling base is 100mm, the watertight cabin and the coupling base are both made of titanium alloy materials, the first-order mode of the seabed permanent fixed optical fiber seismograph is higher than 800Hz, the broadband response technical requirement of DC-200 Hz is met, and the pressure-resistant technical requirement of 3MPa/300m is met.
The utility model has the beneficial technical effects that:
the application discloses a seabed permanent fixed optical fiber seismograph, which adopts a three-dimensional optical fiber sensor technology to replace a traditional electronic type seismic sensor, enhances the seismic signal coupling strength through a coupling base, can realize the broadband response of 10 s-200 Hz and the 10ng/Hz1/2High resolution, which is greater than the technical index of 120dB dynamic range; the seismograph adopts a high-speed digital network bridge technology to realize the long-distance transmission of a twisted-pair communication line, and solves the problem of high cost caused by the adoption of a photoelectric composite water tight-connection plug-in the traditional scheme; the real-time correction of time synchronization is realized by adopting a network time service synchronization scheme, the problems of clock drift and low synchronization time precision of the traditional seismograph are solved, the synchronization precision is better than 10 mu s, and the application requirement of networking detection of the optical fiber seismograph is met; the seismograph solves the problems of power supply and communication by connecting the power supply communication watertight cable with the seabed connection box, realizes the application of permanently arranging the seismograph on seabed for continuous observation, can be used in seabed for a long time without people on duty, has the advantages of high sensitivity, wide response frequency band, large dynamic range and the like, can be used for detecting marine artificial seismic profiles, and can also be used for detecting seabed natural earthquakes.
Drawings
FIG. 1 is a cross-sectional view of a permanently fixed fiber optic ocean bottom seismograph according to the present disclosure.
Fig. 2 is a structural sectional view of a triaxial fiber optic sensing unit in the present application.
FIG. 3 is a communication topology of a permanently fixed fiber optic ocean bottom seismograph disclosed herein.
Detailed Description
The following describes the embodiments of the present invention with reference to the accompanying drawings.
The application discloses a seabed permanent fixed optical fiber seismograph, please refer to fig. 1, the seabed permanent fixed optical fiber seismograph comprises a watertight compartment 1 and a coupling base 2, wherein the watertight compartment 1 comprises a compartment body and end covers on two sides, the end covers on the two sides are respectively fixed on the compartment body, each end cover and the compartment body are fastened by 8M 8 screws, the compartment body and the end covers are subjected to radial and axial watertight treatment by two sealing rubber rings, and as shown in fig. 1, in order to show the structure inside the compartment body, the compartment body is not shown, and only the end covers on the two sides of the compartment watertight compartment 1 are shown. The body of the watertight cabin 1 is fixedly assembled on the coupling base 2, the body of the watertight cabin 1 and the coupling base 2 are fastened and assembled through connecting piece screws, the bottom of the coupling base 2 is of a plane structure, when the seabed permanent fixed type optical fiber seismograph is arranged on the seabed, the coupling base 2 is coupled and matched with seabed media, the detection intensity of seabed seismic wave signals is improved, the specific shape of the coupling base 2 is not limited in the application, and fig. 1 shows a situation. And hoisting rings 3 are respectively fixed on two sides of the coupling base 2, each hoisting ring 3 is fastened with the coupling base 2 through two M8 screws, and the hoisting rings 3 are used for hoisting the seismograph. The watertight cabin 1 and the coupling base 2 are both made of titanium alloy materials, the diameter of the cabin body of the watertight cabin 1 is 450mm, the length of the cabin body is 600mm, the height of the coupling base is 100mm, and the total mass of the seismograph is 175 kg.
The end cover of the watertight cabin 1 is provided with a power supply and communication watertight connector 4, the power supply and communication watertight connector 4 is a four-core electric connection watertight connector, two cores form a group of power supply terminals for power supply, and the other two cores form a group of communication terminals for communication. When the seismograph is used, the power supply communication watertight connector 4 is connected with the seabed connection box through the power supply communication watertight cable, the power supply communication watertight cable comprises a pair of power lines and a pair of twisted-pair communication lines, the power lines are connected with power terminals of the power supply communication watertight connector 4, the twisted-pair communication lines are connected with communication terminals of the power supply communication watertight connector 4, the power supply rated voltage of the power lines is 400VDC, the power is 100W, the communication speed of the twisted-pair communication lines is 1.5Mbit/s, and the length of the power supply communication watertight cable can reach 1500 m.
The end cover of the watertight cabin 1 is also provided with a standby watertight connector 5, the standby watertight connector 5 is a ten-core electric connection watertight connector, and the expansion is used for connecting an underwater environment monitoring sensor to measure the submarine environment parameters. The back-up watertight connector 5 is typically mounted on the same end cap as the mains communication watertight connector 4.
The three-axis optical fiber sensing unit 6, the data acquisition card 7, the demodulation unit 8, the communication control unit 9, the battery 10 and the power supply 11 are arranged inside a cabin body of the watertight cabin 1, the three-axis optical fiber sensing unit 6, the data acquisition card 7, the demodulation unit 8 and the communication control unit 9 are respectively fixed on ribs inside the cabin body, and the battery 10 and the power supply 11 are fixed on the inner side of an end cover of the watertight cabin 1 and are fixed on one end cover provided with the power supply communication watertight connector 4.
Referring to fig. 2, the triaxial optical fiber sensing unit 6 includes a sensing unit housing 61 having a rectangular structure and three one-dimensional sensing units integrated inside the sensing unit housing, which are an X-dimensional sensing unit 62, a Y-dimensional sensing unit 63 and a Z-dimensional sensing unit 64, the three one-dimensional sensing units are respectively implemented by an optical fiber Michelson interferometer, and include three parts, namely a light source system, a photoelectric detection system and an optical fiber measurement system, and sensing devices are integrated into a housing having a diameter of 150 mm. The three one-dimensional sensing units are respectively arranged on the sensing unit shell 61 in a pairwise orthogonal mode to form a high-sensitivity interference type optical fiber seismic sensing unit. In order to inhibit cross talk between high-sensitivity sensor units, the method is limited by improving machining precision and installation precision of the sensing unit shell 61, and in the installation process of the triaxial optical fiber sensing unit 6, firstly, each sensing unit is ensured to be tightly matched with a side panel of the sensing unit shell 61, secondly, four side panels of the sensing unit shell 61 are ensured to be vertically installed with a bottom plate, so that the measuring probes of the three sensing units are ensured to be orthogonal to each other, and the generation of cross talk is inhibited. After the triaxial optical fiber sensing unit 6 is fixed inside the watertight compartment 1, the Z dimension is vertically upward, and the X dimension and the Y dimension are on the horizontal plane.
The triaxial optical fiber sensing unit 6 is connected with the data acquisition card 7, the data acquisition card 7 is connected with the demodulation unit 8 through a USB interface, the demodulation unit 8 is realized based on an FPGA high-performance processor, necessary modules such as demodulation, acquisition, data communication, display interface and the like are combined through the processor by adopting an embedded technology, a flexible and efficient laser interference vibration measurement system is constructed, and the specific structure and the working principle of constructing the demodulation unit based on the FPGA are not introduced any more.
The communication control unit 9 comprises a high-speed digital network bridge, a control circuit board and a time service synchronization module, wherein the high-speed digital network bridge and the time service synchronization module can adopt commercially available modules, the control circuit board comprises a necessary controller for control and a three-axis electronic compass TCMxB, the control circuit board further integrates a MOSFET power switch for power supply management, and the control circuit board further integrates a temperature and humidity pressure sensor for collecting environmental parameters inside a cabin body of the watertight cabin. The time service synchronization module corrects time synchronization errors in real time through a time tag of network communication based on an IEEE1588 protocol. The demodulation unit 8, the control circuit board and the time service synchronization module are respectively connected with a high-speed digital bridge through RJ45 network cables, and the high-speed digital bridge is connected with a communication terminal of the power supply communication watertight connector 4 through a twisted pair type communication line. The high-speed digital bridge is also connected to the standby water sealing plug-in 5 through a double-stranded communication line, and the communication topology is shown in fig. 3.
The battery 10 and the power source 11 form an Uninterruptible Power Supply (UPS) to supply power to the seismograph, the battery 10 and the power source 11 can adopt commercially available modules, the specific mode of forming the UPS is a conventional method, and details are not repeated in the application. The input of the power supply 11 has two channels, one is 400V, the power supply terminal connected with the power supply communication watertight connector 4 supplies power from the outside, and the other is connected with the battery, and the rated power supply voltage is 48V. The capacity of the battery was 48V10 Ah. The output of the power supply is respectively connected with the triaxial optical fiber sensing unit 6, the data acquisition card 7, the demodulation unit 8 and the communication control unit 9, the power supply outputs 5V2A to supply power to the triaxial optical fiber sensing unit 6 and the communication control unit 9, and outputs 12V5A to supply power to the data acquisition card 7 and the demodulation unit 8.
The first-order mode of the seabed permanent fixed type optical fiber seismograph is higher than 800Hz, the technical requirement of DC-200 Hz broadband response is met, the technical requirement of 3MPa/300m pressure resistance is met, and therefore the seabed permanent fixed type optical fiber seismograph is safe to use within 200m underwater. This seismograph is when using, carry out the cloth of seismograph earlier, the cloth should be selected the sand granule as far as possible big, the density silt deposit layer as far as possible in the region of putting, be favorable to seismic wave signal's coupling, utilize high-pressure squirt to wash out a dovetail groove at the seabed deposit layer, be connected power communication watertight connector 4 with 1500 meters power communication watertight cable well, utilize hoist and mount ship to place the seismograph in the dovetail groove through hoisting ring 3, cover silt and improve the coupling strength of seismograph and seabed silt deposit layer.
The other end of the power supply communication watertight cable is in butt joint with the seabed connection box to achieve power-on, communication and time service synchronization of the seismograph, a power supply and communication link is formed between the seabed connection box and the seabed permanent fixed optical fiber seismograph, after the seabed connection box supplies power to the seismograph through the power supply communication watertight cable, the power supply 11 changes the input 400V voltage into 12V5A and 5V2A, and then supplies power to the triaxial optical fiber sensing unit 6, the data acquisition card 7, the demodulation unit 8 and the communication control unit 9. The attitude of the seismometer is measured through a three-axis electronic compass TCMxB, and the heading angle, the pitch angle and the roll angle of the seismometer are given for compensation processing of seismic signals. The conversion between the Ethernet and the twisted-pair communication line is realized by adopting a high-speed digital network bridge, the time synchronization is realized by adopting a network time service mode, the synchronization error is better than 10 mu s, when the time synchronization error detected by the time service synchronization module is less than 10 mu s, a pulse per second signal and time information of an RS232 interface are provided for the demodulation unit, a 10MHz data acquisition clock synchronization signal is provided for the data acquisition card, the real-time correction of the time synchronization is realized, and the problems of clock drift and low synchronization time precision of the traditional seismograph are solved. At the moment, the seismograph starts to operate normally, seismic signals are transmitted to a triaxial optical fiber sensing unit 6 for measurement through a coupling base 2 and a watertight cabin 1, the triaxial optical fiber sensing unit 6 outputs analog signals subjected to phase modulation by vibration acceleration, a three-dimensional analog quantity is converted into a digital quantity through a data acquisition card 7 and then transmitted to a demodulation unit 8, the demodulation unit is constructed on the basis of a high-performance processor, phase generation carrier modulation (PGC) is adopted to demodulate the digital signals to obtain a vibration acceleration value, and information is transmitted to a seabed docking box through a high-speed digital network bridge and finally transmitted to a terminal server.
What has been described above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiments. It is to be understood that other modifications and variations directly derivable or suggested by those skilled in the art without departing from the spirit and scope of the present invention are to be considered as included within the scope of the present invention.
Claims (5)
1. A permanently fixed fiber optic ocean bottom seismograph, comprising: the system comprises a watertight cabin, a coupling base, a triaxial optical fiber sensing unit, a data acquisition card, a demodulation unit, a communication control unit, a battery and a power supply;
the watertight cabin comprises a cabin body and an end cover, wherein the end cover is fixed on the cabin body, radial and axial watertight treatment is carried out between the cabin body and the end cover, a power supply communication watertight connector is mounted on the end cover and comprises a group of power supply terminals and a group of communication terminals, and the power supply communication watertight connector is used for being connected with the seabed connection box through a power supply communication watertight cable; the watertight cabin body is fixedly assembled on the coupling base, the coupling base is arranged on the seabed and used for coupling and matching of a seismograph and the seabed, and hoisting rings are respectively fixed on two sides of the coupling base;
the three-axis optical fiber sensing unit, the data acquisition card, the demodulation unit and the communication control unit are respectively arranged in the cabin body of the watertight cabin, the communication control unit comprises a high-speed digital network bridge, a control circuit board and a time service synchronization module, a three-axis electronic compass is integrated on the control circuit board, the data acquisition card is connected with the three-axis optical fiber sensing unit, the data acquisition card is also connected with the demodulation unit, the control circuit board and the time service synchronization module are respectively connected with the high-speed digital network bridge through RJ45 network cables, and the high-speed digital network bridge is connected with a communication terminal of the power supply communication watertight connector through a double-stranded communication line;
the battery and the power supply are fixed on the inner side of the end cover, the battery and the power supply form an uninterruptible power supply, one input channel of the power supply is connected with a power supply terminal of the power supply and communication watertight connector, the other input channel of the power supply is connected with the battery, and the output of the power supply is respectively connected with the triaxial optical fiber sensing unit, the data acquisition card, the demodulation unit and the communication control unit for supplying power.
2. The permanently fixed fiber optic ocean bottom seismograph of claim 1, wherein the triaxial fiber optic sensing unit comprises a sensing unit housing and three one-dimensional sensing units integrated inside the sensing unit housing, each one-dimensional sensing unit is implemented by a fiber Michelson interferometer, and the three one-dimensional sensing units are respectively installed on the sensing unit housing in a pairwise orthogonal manner.
3. The permanently fixed fiber optic seismograph of claim 1, wherein said end caps further have back-up watertight connectors mounted thereon, said back-up watertight connectors connected to said high speed digital bridge by twisted pair communication lines, said back-up watertight connectors for connection to underwater environmental monitoring sensors.
4. The permanently fixed fiber optic seismograph at sea bottom of any one of claims 1 to 3, wherein a temperature and humidity pressure sensor is further integrated on the control circuit board of the communication control unit, and the temperature and humidity pressure sensor is used for acquiring environmental parameters inside the body of the watertight compartment.
5. The permanently fixed fiber optic seismograph at sea bottom of any one of claims 1 to 3, wherein the diameter of the body of the watertight compartment is 450mm, the length of the body of the watertight compartment is 600mm, the height of the coupling base is 100mm, the watertight compartment and the coupling base are both made of titanium alloy materials, the first-order mode of the permanently fixed fiber optic seismograph at sea bottom is higher than 800Hz, the broadband response technical requirement of DC-200 Hz is met, and the pressure-resistant technical requirement of 3MPa/300m is met.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921228439.4U CN210129046U (en) | 2019-07-31 | 2019-07-31 | Seabed permanent fixed optical fiber seismograph |
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| CN201921228439.4U CN210129046U (en) | 2019-07-31 | 2019-07-31 | Seabed permanent fixed optical fiber seismograph |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114166333A (en) * | 2021-12-14 | 2022-03-11 | 武汉理工大学三亚科教创新园 | Device and method for measuring seabed vibration signals |
| CN114217346A (en) * | 2021-12-14 | 2022-03-22 | 武汉理工大学三亚科教创新园 | Fiber grating submarine vibration signal measuring system |
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2019
- 2019-07-31 CN CN201921228439.4U patent/CN210129046U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114166333A (en) * | 2021-12-14 | 2022-03-11 | 武汉理工大学三亚科教创新园 | Device and method for measuring seabed vibration signals |
| CN114217346A (en) * | 2021-12-14 | 2022-03-22 | 武汉理工大学三亚科教创新园 | Fiber grating submarine vibration signal measuring system |
| CN114166333B (en) * | 2021-12-14 | 2024-05-07 | 武汉理工大学三亚科教创新园 | Submarine vibration signal measuring device and measuring method |
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