Portable marine geomagnetic diurnal variation combined observation device

Abstract

The invention discloses a portable marine geomagnetic diurnal variation combined observation device which is applied to the technical field of geomagnetic field observation. Comprising a battery pressure-resistant cabin, a first instrument pressure-resistant cabin and a second instrument pressure-resistant cabin which are sequentially connected through cables, a fluxgate sensor, an attitude sensor, an atomic magnetometer electronic unit and a data acquisition unit are arranged in the first instrument pressure-resistant cabin, and an atomic magnetometer probe is arranged in the second instrument pressure-resistant cabin. The atomic magnetometer probe is connected with the atomic magnetometer electronic unit through an atomic magnetic probe radio frequency watertight cable and an atomic magnetometer signal watertight cable, and a depth meter is arranged on the outer side of the battery pressure-resistant cabin and connected with the data acquisition unit through a depth signal line. The marine terrestrial magnetism daily variation combination observation device provided by the invention can realize relatively stable long-term observation of marine terrestrial magnetism total intensity and a vector field, and the data observation quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of geomagnetic field observation, and more specifically to a portable combined ocean geomagnetic diurnal variation observation device. Background Art

[0002] The ocean occupies two-thirds of the earth's surface area, but there is still a huge gap in geophysical observation of the vast seabed. Marine magnetic measurement technology is an important means to understand and develop the ocean. Marine magnetic field information is an important part of the construction of marine battlefield environmental information, and it is also one of the main contents of geophysical field and marine geological science research. The most valuable and important thing at sea is continuous observation. If the observation point is placed on the seabed, it will not be restricted by environmental factors such as wind and waves, and various mutation information can be continuously observed and recorded. Carrying out long-term observation of seabed geomagnetic diurnal variation in the sea area is not only because it is an integral part of studying the global geomagnetic field, but also a need and necessity for the development of science and technology. At present, marine magnetic field observation has developed from traditional geomagnetic total intensity measurement to geomagnetic vector field measurement, so as to obtain more abundant marine geomagnetic field information. In the existing seabed observation field, the sensitivity, accuracy, sampling rate and working stability of magnetic sensors are continuously improved, and a number of auxiliary measurement devices, such as azimuth sensors, attitude sensors, pressure depth meters, acoustic altimeters, acoustic ultra-short baseline positioning systems and other technologies, are combined to further improve the quality of magnetic sensor observation data and the accuracy of environmental noise correction. However, the long-term seabed working stability of oceanographic instruments is the most important indicator of their performance, and the stability of existing observation devices cannot meet the needs of long-term seabed work. Therefore, how to provide a portable ocean geomagnetic daily variation combined observation device is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0003] In view of this, the present invention provides a portable combined observation device for daily variation of ocean geomagnetic field, which integrates an atomic magnetometer and a vector magnetometer into one by using a titanium alloy pressure-resistant sealed cabin, so as to realize long-term observation of all elements of the geomagnetic field. The observation device has the characteristics of simple system and easy recovery, and solves the problem of stable suspension at a fixed seawater depth, thereby obtaining high-quality magnetic field measurement data.

[0004] In order to achieve the above object, the present invention provides the following technical solutions: A portable combined observation device for daily variation of ocean geomagnetic field comprises a battery pressure cabin, a first instrument pressure cabin and a second instrument pressure cabin which are connected in sequence by cables, wherein a fluxgate sensor, a posture sensor, an atomic magnetometer electronic unit and a data acquisition unit are arranged in the first instrument pressure cabin, an atomic magnetometer probe is arranged in the second instrument pressure cabin, the atomic magnetometer probe is connected to the atomic magnetometer electronic unit by an atomic magnetic probe radio frequency watertight cable and an atomic magnetometer signal watertight cable, a depth gauge is arranged outside the battery pressure cabin, the depth gauge is connected to the data acquisition unit by a depth signal line, and the battery pressure cabin supplies power to the first instrument pressure cabin by a power supply watertight cable.

[0005] Optionally, it also includes a beacon and a float, wherein the beacon is connected to the float via a cable, and the float is connected to the battery pressure cabin via a cable, and the float provides positive buoyancy to keep the observation device in a stable state.

[0006] Optionally, it also includes an acoustic releaser and a counterweight block, wherein the acoustic releaser is connected to the second instrument pressure cabin via a cable, and the counterweight block is connected to the acoustic releaser via a metal fuse device.

[0007] Optionally, the fluxgate sensor is rigidly connected to the attitude sensor, and the three-axis directions of the fluxgate sensor and the attitude sensor are consistent, providing observation data for subsequent data correction.

[0008] Optionally, the first instrument pressure cabin and the second instrument pressure cabin both use titanium alloy material as the main body of the sealed cabin to meet the working environment of 1000 meters underwater and the requirements of the atomic magnetic probe for the magnetic field uniformity zone in the observation area, and the designed wall thickness is 12mm.

[0009] Optionally, the upper and lower covers of the battery pressure cabin, the first instrument pressure cabin and the second instrument pressure cabin are each provided with two sealing rings to ensure waterproof performance.

[0010] Optionally, annular pull rings made of titanium alloy are provided on the top and bottom of the first instrument pressure cabin and the second instrument pressure cabin to facilitate the connection of cables.

[0011] It can be seen from the above technical solution that, compared with the prior art, the present invention provides a portable combined observation device for daily variation of ocean geomagnetic field, which has the following beneficial effects: 1. The present invention adopts titanium alloy material to make the pressure-resistant sealed cabin of the instrument, which ensures the atomic magnetic probe's requirement for the uniform magnetic field area in the observation area; 2. The present invention integrates the atomic magnetometer and the vector magnetometer into one, realizing mutual calibration between the atomic magnetic probe and the miniaturized fluxgate sensor dual magnetic probe; 3. The present invention ensures the solution of the magnetic axis and the geographic coordinate system by rigidly connecting the fluxgate sensor and the attitude sensor, thereby providing high-quality observation data for subsequent data correction; 4. The present invention has the characteristics of simple system and easy recovery, and at the same time solves the problem of stable suspension at a fixed seawater depth, thereby obtaining high-quality magnetic field measurement data. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0013] Figure 1 It is a schematic structural diagram of the portable combined ocean geomagnetic daily variation observation device of the present invention; Figure 2 It is a schematic diagram of the pressure-resistant cabin sealing ring and the annular pull ring of the present invention; In the figure: 1-battery pressure cabin, 2-first instrument pressure cabin, 3-second instrument pressure cabin, 4-acoustic releaser, 5-depth gauge, 6-cable, 7-beacon, 8-float, 9-counterweight, 10-metal fuse device, 11-atomic magnetic probe radio frequency watertight cable, 12-atomic magnetometer signal watertight cable, 13-depth signal line, 14-power supply watertight cable, 21-fluxgate sensor, 22-attitude sensor, 23-atomic magnetometer electronic unit, 24-data acquisition unit, 31-atomic magnetometer probe. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] The embodiment of the present invention discloses a portable combined observation device for daily variation of ocean geomagnetic field. Figure 1As shown, it includes a battery pressure cabin 1, a first instrument pressure cabin 2 and a second instrument pressure cabin 3 which are connected in sequence through a cable 6. A fluxgate sensor 21, a posture sensor 22, an atomic magnetometer electronic unit 23 and a data acquisition unit 24 are arranged in the first instrument pressure cabin 2. An atomic magnetometer probe 31 is arranged in the second instrument pressure cabin 3. The atomic magnetometer probe 31 is connected to the atomic magnetometer electronic unit 23 through an atomic magnetic probe radio frequency watertight cable 11 and an atomic magnetometer signal watertight cable 12. A depth gauge 5 is arranged outside the battery pressure cabin 1. The depth gauge 5 is connected to the data acquisition unit 24 through a depth signal line 13. The battery pressure cabin 1 supplies power to the first instrument pressure cabin 2 through a power supply watertight cable 14.

[0016] In the embodiment of the present invention, the data acquisition unit 24 can simultaneously acquire the observation data of each sensor, and the time synchronization is effective, thereby providing high-quality observation data for subsequent data correction; the battery pack in the battery pressure cabin 1 supplies power to the data acquisition unit 24, and the data acquisition unit 24 supplies power to other components of the observation device; In the embodiment of the present invention, the battery pressure cabin 1 and the first instrument pressure cabin 2 need to maintain a certain safety distance for magnetic disturbance avoidance, ensuring that the peak-to-peak value of the magnetic disturbance of the battery pressure cabin 1 to the fluxgate sensor 21 in the first instrument pressure cabin 2 is less than 0.1nT; Furthermore, it also includes a beacon 7 and a float 8. The beacon 7 is connected to the float 8 through a cable 6, and the float 8 is connected to the battery pressure cabin 1 through the cable 6. The float 8 provides positive buoyancy to keep the observation device in a stable state.

[0017] Furthermore, it also includes an acoustic releaser 4 and a counterweight 9. The acoustic releaser 4 is connected to the second instrument pressure cabin through a cable 6, and the counterweight 9 is connected to the acoustic releaser 4 through a metal fuse device 10.

[0018] In the embodiment of the present invention, the acoustic release generator 4 is connected to the counterweight 9 through a metal fuse device 10; in order to effectively improve the recovery success rate of the buoy and reduce system risks, two acoustic releasers 4 are configured at the bottom of the observation device, which are adjusted according to the depth of the sea water. In order to prevent excessive torque at the counterweight 9 and the acoustic releaser 4, a rotating ring is installed at the lower end of the acoustic releaser 4 to effectively release the torque generated when the sea water is disturbed. The counterweight 9 is a weak magnetic material, generally cast by adding a copper tube to white cement.

[0019] Furthermore, the fluxgate sensor 21 is rigidly connected to the attitude sensor 22, and the three-axis directions of the fluxgate sensor 21 and the attitude sensor 22 are consistent, providing observation data for subsequent data correction.

[0020] Furthermore, the first instrument pressure cabin 2 and the second instrument pressure cabin 3 both use titanium alloy material as the main body of the sealed cabin, which meets the working environment of 1000 meters underwater and the requirements of the atomic magnetic probe for the magnetic field uniformity area in the observation area, and the designed wall thickness is 12mm.

[0021] In the embodiment of the present invention, the first instrument pressure cabin 2 and the second instrument pressure cabin 3 can withstand a pressure of about 10 MPa.

[0022] Furthermore, the upper and lower covers of the battery pressure chamber 1, the first instrument pressure chamber 2 and the second instrument pressure chamber 3 are each provided with two sealing rings 15 to ensure waterproof performance. Figure 2 shown.

[0023] Furthermore, the first instrument pressure-resistant cabin 2 and the second instrument pressure-resistant cabin 3 are both provided with an annular pull ring 16 made of titanium alloy to facilitate the connection of the cable 6. Figure 2 shown.

[0024] In the embodiment of the present invention, the working process of the portable ocean geomagnetic diurnal variation combined observation device is as follows: When the observation device is assembled, the cable 6 connects the components, and the float 8 provides positive buoyancy to keep the whole device in a taut and stable state, and the cable 6 bears the tension of each component, so that each watertight cable is not affected by force; each pressure-resistant sealed cabin is equipped with a ring pull ring 16 made of titanium alloy above and below to facilitate the connection of the cable 6. According to the depth of the water level, the corresponding number of floats 8 and the length of the cable 6 are configured; the counterweight block 9 is generally a circular structure, so that its bottom is fully coupled with the seabed to prevent the sinking of the whole structure. The float 8 is installed above the instrument sealed cabin to provide buoyancy, so that the specific area of ​​the buoy remains in a vertical state. When the system needs to be recovered, the acoustic releaser 4 sends a signal to melt the metal fuse 10 to release the counterweight block 9, and the rest of the system floats to the sea surface under the action of the float 8 to complete the salvage recovery.

[0025] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0026] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A portable combined observation device for daily variation of ocean geomagnetic field, characterized in that: The invention comprises a battery pressure-resistant cabin (1), a first instrument pressure-resistant cabin (2) and a second instrument pressure-resistant cabin (3) which are connected in sequence via a cable (6); a fluxgate sensor (21), a posture sensor (22), an atomic magnetometer electronic unit (23) and a data acquisition unit (24) are arranged in the first instrument pressure-resistant cabin (2); an atomic magnetometer probe (31) is arranged in the second instrument pressure-resistant cabin (3); the atomic magnetometer probe (31) is connected to the atomic magnetometer electronic unit (23) via an atomic magnetometer radio frequency watertight cable (11) and an atomic magnetometer signal watertight cable (12); a depth gauge (5) is arranged outside the battery pressure-resistant cabin (1); the depth gauge (5) is connected to the data acquisition unit (24) via a depth signal line (13); and the battery pressure-resistant cabin (1) supplies power to the first instrument pressure-resistant cabin (2) via a power supply watertight cable (14).

2. A portable combined ocean geomagnetic daily variation observation device according to claim 1, characterized in that: It also includes a beacon (7) and a buoy (8), wherein the beacon (7) is connected to the buoy (8) via a cable (6), and the buoy (8) is connected to the battery pressure cabin (1) via the cable (6), and the buoy (8) provides positive buoyancy to keep the observation device in a stable state.

3. A portable combined ocean geomagnetic daily variation observation device according to claim 1, characterized in that: It also includes an acoustic releaser (4) and a counterweight (9), wherein the acoustic releaser (4) is connected to the second instrument pressure cabin (3) via a cable (6), and the counterweight (9) is connected to the acoustic releaser (4) via a metal fuse device (10).

4. A portable combined observation device for daily variation of ocean geomagnetic field according to claim 1, characterized in that: The fluxgate sensor (21) is rigidly connected to the attitude sensor (22), and the three-axis directions of the fluxgate sensor (21) and the attitude sensor (22) are consistent, providing observation data for subsequent data correction.

5. The portable combined observation device for daily variation of ocean geomagnetic field according to claim 1, characterized in that: The first instrument pressure-resistant cabin (2) and the second instrument pressure-resistant cabin (3) both use titanium alloy material as the main body of the sealed cabin, meet the working environment of 1000 meters underwater, and meet the requirements of the atomic magnetic probe for the magnetic field uniformity area of ​​the observation area, and the designed wall thickness is 12 mm.

6. The portable combined observation device for daily variation of ocean geomagnetic field according to claim 1, characterized in that: The upper and lower covers of the battery pressure-resistant cabin (1), the first instrument pressure-resistant cabin (2) and the second instrument pressure-resistant cabin (3) are each provided with two sealing rings (15) to ensure waterproof performance.

7. The portable combined observation device for daily variation of ocean geomagnetic field according to claim 1, characterized in that: Annular pull rings (16) made of titanium alloy are provided above and below the first instrument pressure cabin (2) and the second instrument pressure cabin (3) to facilitate the connection of the cable (6).

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