A field calibration device for geomagnetic magnetometer with magnetic field coil in different regions

Abstract

The invention discloses an on-site calibration device for a geomagnetic magnetometer with a magnetic field coil in a different region, and belongs to the technical field of magnetic measuring instrument measurement. The on-site calibration device for a geomagnetic magnetometer with a magnetic field coil in a different region comprises a magnetic field coil in a different region. A telescopic plate is arranged, and when the calibration device is conveniently moved to a measuring position through a bracket for use, in order to improve the stability of the support of the calibration device when the bracket contacts the ground, according to the needs of the support area and the fixed position, a knob is first rotated to drive a threaded slider to slide along the inner wall of a fixed groove through the rotation of a threaded rod. The sliding of the threaded slider drives a connecting rod fixedly connected to the telescopic rod to perform a telescopic movement through the connection of a rotating rod. The telescopic plate is driven to perform a telescopic movement along the outer wall of a connecting box through the connection of the connecting rod. According to the needs of the fixed position, an anchor is rotated, so that under the connection between the anchor and the ground, the bracket and the ground are driven to stably support and move, thereby achieving the effect of improving the support stability of the calibration device by the bracket.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic measuring instrument measurement, in particular to an on-site calibration device for a geomagnetic magnetometer with a magnetic field coil in a different region. Background Art

[0002] Based on the high sensitivity and fast response technical characteristics of the optically pumped magnetometer, the measurement results of the geomagnetic field are locked in a closed loop to create a high-stability magnetic field environment for the calibration of the magnetometer. This is a more practical measurement technology in the field of geomagnetic magnetometer measurement. However, due to the large size of the magnetometer probe, which is generally 3 to 7 cm, and the two magnetometers will cause greater mutual interference when working at the same time, in order to avoid instrument interference, it is necessary to create a large uniform magnetic field. The overall volume of the coil with a large uniform area is relatively large. For example, when a uniform magnetic field with a uniform area greater than 10 cm is generated and the uniformity reaches one millionth, the volume of the common compound Helmholtz coil will reach 3.6 meters in diameter, and the length of the Barker structure coil will also exceed 2 meters. Only in this way can it be ensured that in such a uniform magnetic field, after the magnetic field is locked using the phase-locked loop principle, the stability of the magnetic field reaches a level that can evaluate the pT-level noise of the optically pumped magnetometer. Such a large coil will not be able to move and cannot meet the needs of measurement at the field work site.

[0003] However, although the existing magnetic field calibration device can measure the magnetic field well when in use, the area of ​​the magnetic field calibration device is relatively large, and the flexibility of the calibration device for convenient carrying and measurement at different locations is not high. When the calibration device is used for auxiliary support by a bracket, the adjustability of the bracket and the ground support position is not high, which makes the adjustability of the calibration device and the ground support area range not high, affecting the stability of the calibration device placed on different measurement grounds. In addition, when the bracket is stored on the outer wall of the calibration device for storage and carrying, the clamping and fixing effect of the bracket and the calibration device when stored is not high, which is easy to cause inconvenience to the carrier due to the shaking of the support, and does not meet people's use needs. For this reason, we propose an on-site calibration device for a geomagnetic magnetometer with a magnetic field coil in a different area. Summary of the invention

[0004] The purpose of the present invention is to provide a field calibration device for a geomagnetic magnetometer with a different magnetic field coil, so as to solve the problems raised in the above-mentioned background technology that the calibration device is not flexible enough to carry and measure at different locations, the adjustability of the bracket and the ground support position is not high, and the clamping and fixing effect of the bracket and the calibration device when they are stored is not high.

[0005] The present invention is implemented as follows: a field calibration device for a geomagnetic magnetometer with a magnetic field coil in a different region, comprising a magnetic field coil in a different region, wherein the magnetic field coil in a different region comprises a stabilizing field magnetometer, an automatic stabilizing field circuit, a standard magnetometer, a bracket and a positioning mechanism arranged on the outer wall of the bracket, the inner side wall of the magnetic field coil in a different region is provided with a stabilizing field magnetometer, one end of the stabilizing field magnetometer is provided with an automatic stabilizing field circuit, the inner side wall of the magnetic field coil in a different region is provided with a standard magnetometer located above the stabilizing field magnetometer, and the outer wall of the magnetic field coil in a different region is rotatably connected with the bracket;

[0006] The positioning mechanism includes a sliding component, a rotating component and a telescopic component;

[0007] The sliding assembly includes a threaded slider and a fixing groove, the end of the bracket is fixedly connected to a connection box, the inner wall of the connection box is rotatably connected to a threaded rod, one end of the threaded rod is fixedly connected to a knob that fits the outer wall of the connection box, the outer wall of the threaded rod is threadedly connected to a threaded slider that is slidably connected to the outer wall of the connection box, and a fixing groove is provided at the connection portion between the outer wall of the connection box and the threaded slider;

[0008] The rotating assembly comprises a rotating rod and a connecting rod, the outer wall of the threaded slider is rotatably connected to the rotating rod, and one end of the rotating rod is rotatably connected to the connecting rod telescopically connected to the inner wall of the connecting box;

[0009] The telescopic assembly includes a telescopic plate, a telescopic rod and an anchor nail. The outer wall of the connecting rod is fixedly connected to the telescopic rod fixedly connected to the inner wall of the connecting box. The outer wall of the connecting rod is fixedly connected to the telescopic plate slidably connected to the outer wall of the connecting box. The outer wall of the telescopic plate is threadedly connected to the anchor nail.

[0010] Preferably, a cleaning mechanism is provided at the bottom of the connection box, and a storage mechanism located on the movement track of the bracket is provided on the outer wall of the different-zone magnetic field coil.

[0011] Preferably, two groups of threaded rods are provided, the rotation directions of the two groups of threaded rods are opposite, the rotating rods and the threaded rods are arranged in a one-to-one correspondence, the bracket and the connecting box are symmetrically arranged on both sides of the different-zone magnetic field coil, the telescopic rod is arranged above the threaded rod, and there is a spacing between the telescopic rod and the threaded rod.

[0012] Preferably, the different-zone magnetic field coil is a coil group composed of seven circular hollow coils, and two points 80 cm apart are arranged inside the different-zone magnetic field coil to generate a highly consistent uniform magnetic field. The stable-field magnetometer is specifically a self-excited optically pumped magnetometer, and the automatic stable-field circuit includes a phase detector, a reference frequency source, and a phase-locked loop circuit with feedback current output. The specific material of the bracket is non-magnetic material, and the standard magnetometer is specifically a proton magnetometer.

[0013] Preferably, the cleaning mechanism includes a swing rod, a first limiting groove, a cleaning scraper, a second limiting groove and a sliding groove, the outer wall of the cleaning mechanism is provided with a swing rod slidably connected to the outer wall of the threaded slider, and the rotation center of the swing rod is rotationally connected to the bottom of the connecting box through a rotating shaft, a first limiting groove is provided at the connecting portion between the outer wall of the swing rod and the threaded slider, a cleaning scraper slidably connected to the outer wall of the swing rod is slidably connected to the bottom of the connecting box, a second limiting groove is provided at the connecting portion between the outer wall of the swing rod and the cleaning scraper, and a sliding groove is provided at the connecting portion between the bottom of the connecting box and the cleaning scraper.

[0014] Preferably, two groups of swing rods are provided, and the positions of the two groups of swing rods are distributed symmetrically with respect to the central axis of the connecting box. The positions of the first limiting groove and the second limiting groove are distributed equidistantly with respect to the rotation center of the swing rod. The cleaning scrapers are symmetrically arranged on both sides of the connecting box, and the cleaning scrapers are arranged on the movement trajectory of the anchor nail.

[0015] Preferably, the storage mechanism includes a connecting block, an insertion rod, a storage box, a sliding rod, a spring, a pulling block, a card ball and a slot; the outer wall of the bracket is fixedly connected to the connecting block, the outer wall of the connecting block is fixedly connected to the insertion rod, the outer wall of the different-zone magnetic field coil is fixedly connected to the storage box slidably connected to the outer wall of the insertion rod, the outer wall of the storage box is slidably connected to the sliding rod, the outer wall of the sliding rod is sleeved with a spring fixedly connected to the outer wall of the storage box, one end of the spring is fixedly connected to a pulling block fixedly connected to one end of the sliding rod, one end of the sliding rod is fixedly connected to a card ball engaged with the outer wall of the insertion rod, and a slot is provided at the connecting part between the outer wall of the insertion rod and the card ball.

[0016] Preferably, the storage box is arranged on the movement track of the insertion rod, and a slot is provided at the connection position between the outer wall of the storage box and the insertion rod, and the sliding rods are symmetrically arranged on both sides of the storage box.

[0017] Preferably, the extrusion portion of the insertion rod and the locking ball is in an arc shape, the outer wall profile of the locking groove is in a "V" shape, and the storage box and the bracket are arranged in a one-to-one correspondence.

[0018] The invention provides a field calibration device for a geomagnetic magnetometer with a different magnetic field coil, which has the following beneficial effects when used:

[0019] 1. A field calibration device for a geomagnetic magnetometer with a magnetic field coil in a different region is provided with a telescopic plate. When the calibration device is conveniently moved to a measuring position through a bracket, in order to improve the stability of the support of the calibration device when the bracket contacts the ground, according to the needs of the support area and the fixed position, the knob can be first turned to drive the threaded slider to slide along the inner wall of the fixed groove through the rotation of the threaded rod. The sliding of the threaded slider drives the connecting rod fixedly connected to the telescopic rod to perform telescopic movement through the connection of the rotating rod. At the same time, through the connection of the connecting rod, the telescopic plate is driven to perform telescopic movement along the outer wall of the connecting box. According to the needs of the fixed position, the anchor nail is rotated, so that under the connection between the anchor nail and the ground, the bracket and the ground are driven to stably support and move, thereby achieving the effect of improving the support stability of the calibration device by the bracket.

[0020] 2. This field calibration device for a geomagnetic magnetometer with a different-region magnetic field coil is provided with a cleaning scraper. When the telescopic movement of the telescopic plate drives the anchor to be adjusted with the fixed position on the ground, in order to improve the synchronous effect of scraping and cleaning impurities on the surface of the ground to be fixed and facilitate the anchor to be turned into the ground, the threaded slider slides along the inner wall of the fixed groove, which will drive the threaded slider to slide along the inner wall of the first limit groove and drive the swing rod to rotate synchronously. The rotation of the swing rod will drive the cleaning scraper to slide synchronously along the inner wall of the slide groove under the connection of the second limit groove. The centering movement of the cleaning scraper can achieve the effect of effectively scraping and cleaning the soil impurities under the anchor.

[0021] 3. This field calibration device for a geomagnetic magnetometer with a magnetic field coil in a different region is provided with a card ball. When the calibration device is supported and used by a bracket, in order to improve the stability of the bracket when it is stored with the calibration device, when the bracket is stored, the connection of the connecting block will drive the insertion rod to be inserted into the storage box. When the extrusion part between the insertion rod and the card ball is in an arc shape, the sliding rod and the spring are squeezed until the insertion rod slides into the card slot, so that the card ball is locked and fixed in the "V"-shaped card slot, thereby achieving the effect of improving the stability of the connection between the bracket and the calibration device when stored.

[0022] 4. This is a field calibration device for geomagnetic magnetometers with magnetic field coils in different regions. By setting up a standard magnetometer, the magnetic field in different regions is used to generate two highly consistent uniform magnetic fields. The bracket is used to fix the magnetic field coil in different regions to align its axis with the geomagnetic direction. The steady-field magnetometer is used to detect geomagnetic fluctuations. The automatic steady-field circuit is used to lock the two uniform magnetic fields to the target value. The standard magnetometer is used to test the accurate magnetic field value of the uniform region used for calibration. When it is implemented, the magnetic field coil in different regions is adjusted through the bracket to make the coil axis roughly align with the geomagnetic direction, the steady-field magnetometer is used to detect the geomagnetic field value and pass it to the automatic steady-field circuit. The magnetic field is locked through a phase-locked loop, and the standard magnetometer is placed in the working area to perform calibration, testing, comparison and other measurement work. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. As shown in the accompanying drawings, the above and other purposes, features and advantages of the present invention will be clearer. The same reference numerals in all the drawings indicate the same parts. The drawings are not deliberately scaled to the actual size, and the focus is on illustrating the main purpose of the present invention.

[0024] Figure 1 It is a schematic diagram of the overall detection state structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the storage and connection structure of the bracket and the different-region magnetic field coil of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the bracket and the different-zone magnetic field coil being received and connected as viewed from above of the present invention;

[0027] Figure 4 It is a schematic diagram of the internal structure of the connection box of the present invention;

[0028] Figure 5 It is a schematic diagram of the position distribution structure of the swing rod of the present invention;

[0029] Figure 6 It is a schematic diagram of the engaging connection structure between the insertion rod and the storage box of the present invention;

[0030] Figure 7 It is a schematic diagram of the explosion structure of the plug rod and the stuck ball connection of the present invention.

[0031] Summary of reference numerals in the accompanying drawings: 1. Different-zone magnetic field coil; 2. Steady-field magnetometer; 3. Automatic steady-field circuit; 4. Standard magnetometer; 5. Bracket; 6. Connecting box; 7. Threaded rod; 8. Knob; 9. Threaded slider; 10. Fixed slot; 11. Rotating rod; 12. Connecting rod; 13. Telescopic plate; 14. Telescopic rod; 15. Anchor; 16. Cleaning mechanism; 1601. Swinging rod; 1602. First limiting slot; 1603. Cleaning scraper; 1604. Second limiting slot; 1605. Slide slot; 17. Storage mechanism; 1701. Connecting block; 1702. Inserting rod; 1703. Storage box; 1704. Sliding rod; 1705. Spring; 1706. Pull block; 1707. Card ball; 1708. Card slot. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0036] For examples, see Figures 1 to 7 The present embodiment provides a field calibration device for a geomagnetic magnetometer with a magnetic field coil in a different region, comprising a magnetic field coil in a different region 1, wherein the magnetic field coil in a different region 1 comprises a stabilizing field magnetometer 2, an automatic stabilizing field circuit 3, a standard magnetometer 4, a bracket 5 and a positioning mechanism arranged on the outer wall of the bracket 5, the stabilizing field magnetometer 2 is arranged on the inner wall of the magnetic field coil in a different region 1, the automatic stabilizing field circuit 3 is arranged on one end of the stabilizing field magnetometer 2, the standard magnetometer 4 located above the stabilizing field magnetometer 2 is arranged on the inner wall of the magnetic field coil in a different region 1, and the bracket 5 is rotatably connected to the outer wall of the magnetic field coil in a different region 1;

[0037] The positioning mechanism includes a sliding component, a rotating component and a telescopic component;

[0038] The sliding assembly includes a threaded slider 9 and a fixing groove 10. The end of the bracket 5 is fixedly connected to the connection box 6. The inner wall of the connection box 6 is rotatably connected to the threaded rod 7. One end of the threaded rod 7 is fixedly connected to a knob 8 that fits the outer wall of the connection box 6. The outer wall of the threaded rod 7 is threadedly connected to the threaded slider 9 that is slidably connected to the outer wall of the connection box 6. The connecting portion of the outer wall of the connection box 6 and the threaded slider 9 is provided with a fixing groove 10.

[0039] The rotating assembly includes a rotating rod 11 and a connecting rod 12. The outer wall of the threaded slider 9 is rotatably connected to the rotating rod 11. One end of the rotating rod 11 is rotatably connected to the connecting rod 12 which is telescopically connected to the inner wall of the connecting box 6.

[0040] The telescopic assembly includes a telescopic plate 13, a telescopic rod 14 and an anchor 15. The outer wall of the connecting rod 12 is fixedly connected to the telescopic rod 14 which is fixedly connected to the inner wall of the connecting box 6. The outer wall of the connecting rod 12 is fixedly connected to the telescopic plate 13 which is slidably connected to the outer wall of the connecting box 6. The outer wall of the telescopic plate 13 is threadedly connected to the anchor 15.

[0041] Furthermore, a cleaning mechanism 16 is provided at the bottom of the connecting box 6, and a storage mechanism 17 located on the movement trajectory of the bracket 5 is provided on the outer wall of the heterogeneous magnetic field coil 1. This is beneficial for effectively scraping and cleaning the soil impurities under the anchor 15 by providing the cleaning mechanism 16 at the bottom of the connecting box 6, and is beneficial for improving the stability of the connection between the bracket 5 and the calibration device when it is stored by providing the storage mechanism 17 located on the movement trajectory of the bracket 5 on the outer wall of the heterogeneous magnetic field coil 1.

[0042] Furthermore, two groups of threaded rods 7 are provided, and the rotation directions of the two groups of threaded rods 7 are opposite. The rotating rods 11 and the threaded rods 7 are arranged in a one-to-one correspondence. The bracket 5 and the connecting box 6 are symmetrically arranged on both sides of the different-region magnetic field coil 1. The telescopic rod 14 is arranged above the threaded rod 7, and there is a spacing between the telescopic rod 14 and the threaded rod 7. It is beneficial to provide two groups of threaded rods 7 with opposite rotation directions to drive the two groups of threaded sliders 9 to slide relative to each other. The sliding of the threaded slider 9 is connected through the rotation of the rotating rod 11, driving the telescopic plate 13 to telescope along the outer wall of the connecting box 6, so that under the connection between the anchor nail 15 and the ground, the bracket 5 is driven to stably support the movement with the ground, thereby achieving the effect of improving the support stability of the calibration device by the bracket 5.

[0043] Furthermore, the heterogeneous magnetic field coil 1 is a coil group composed of seven circular hollow coils, and two points 80 cm apart are arranged inside the heterogeneous magnetic field coil 1 to generate a highly consistent uniform magnetic field. The stable field magnetometer 2 is specifically a self-excited optical pump magnetometer. The automatic stable field circuit 3 includes a phase detector, a reference frequency source and a phase-locked loop circuit with feedback current output. The specific material of the bracket 5 is a non-magnetic material. The standard magnetometer 4 is specifically a proton magnetometer. It is beneficial to improve the convenience of carrying and detecting the calibration device through the setting of the stable field magnetometer 2 and the automatic stable field circuit 3, and achieve the effect of improving the accurate measurement of the magnetic field value at different measurement positions.

[0044] Furthermore, the cleaning mechanism 16 includes a swing rod 1601, a first limiting groove 1602, a cleaning scraper 1603, a second limiting groove 1604 and a slide groove 1605. The outer wall of the cleaning mechanism 16 is provided with a swing rod 1601 slidably connected to the outer wall of the threaded slider 9, and the rotation center of the swing rod 1601 is rotationally connected to the bottom of the connecting box 6 through a rotating shaft. The connecting portion between the outer wall of the swing rod 1601 and the threaded slider 9 is provided with a first limiting groove 1602, the outer wall of the swing rod 1601 is slidably connected to a cleaning scraper 1603 slidably connected to the bottom of the connecting box 6, the connecting portion between the outer wall of the swing rod 1601 and the cleaning scraper 1603 is provided with a second limiting groove 1604, and the connecting portion between the bottom of the connecting box 6 and the cleaning scraper 1603 A slide groove 1605 is provided, and a cleaning scraper 1603 is set, which is beneficial when the telescopic movement of the telescopic plate 13 drives the anchor 15 to adjust with the fixed position on the ground. In order to improve the synchronous effect of scraping and cleaning impurities on the surface of the ground to be fixed, and to facilitate the anchor 15 to be turned into the ground, the threaded slider 9 slides along the inner wall of the fixed groove 10, which will drive the threaded slider 9 to slide along the inner wall of the first limiting groove 1602, and drive the swing rod 1601 to rotate synchronously. The rotation of the swing rod 1601 will drive the cleaning scraper 1603 to slide synchronously along the inner wall of the slide groove 1605 under the connection of the second limiting groove 1604, and the centering movement of the cleaning scraper 1603 can achieve the effect of effectively scraping and cleaning the soil impurities under the anchor 15.

[0045] Furthermore, two groups of swing arms 1601 are provided, and the position distribution of the two groups of swing arms 1601 is symmetrical about the central axis of the connecting box 6. The position distribution of the first limiting groove 1602 and the second limiting groove 1604 is equidistantly distributed about the rotation center of the swing arm 1601. The cleaning scraper 1603 is symmetrically arranged on both sides of the connecting box 6, and the cleaning scraper 1603 is arranged on the movement trajectory of the anchor 15. The swing arm 1601 forms a rotating structure with the connecting box 6 through the threaded slider 9 and the first limiting groove 1602, and the cleaning scraper 1603 forms a sliding structure with the swing arm 1601, the second limiting groove 1604 and the slide groove 1605, which is beneficial to the rotation of the swing arm 1601. Through the connection of the second limiting groove 1604, the cleaning scraper 1603 is driven to slide along the inner wall of the slide groove 1605, so as to drive the cleaning scraper 1603 to move conveniently in the center, so as to achieve the effect of effectively scraping and cleaning the soil impurities under the anchor 15.

[0046] Furthermore, the storage mechanism 17 includes a connecting block 1701, an insertion rod 1702, a storage box 1703, a sliding rod 1704, a spring 1705, a pull block 1706, a card ball 1707 and a card slot 1708. The outer wall of the bracket 5 is fixedly connected to the connecting block 1701, the outer wall of the connecting block 1701 is fixedly connected to the insertion rod 1702, the outer wall of the different-zone magnetic field coil 1 is fixedly connected to the storage box 1703 slidably connected to the outer wall of the insertion rod 1702, the outer wall of the storage box 1703 is slidably connected to the sliding rod 1704, the outer wall of the sliding rod 1704 is sleeved with a spring 1705 fixedly connected to the outer wall of the storage box 1703, one end of the spring 1705 is fixedly connected to the pull block 1706 fixedly connected to one end of the sliding rod 1704, and one end of the sliding rod 1704 is fixedly connected to the outer wall of the insertion rod 1702. The locking ball 1707 is connected to the wall by locking engagement, and a locking groove 1708 is provided at the connection position between the outer wall of the insertion rod 1702 and the locking ball 1707. By setting the locking ball 1707, it is beneficial when the calibration device is supported and used by the bracket 5. In order to improve the stability of the bracket 5 when it is stored with the calibration device, when the bracket 5 is stored, it will drive the insertion rod 1702 to be inserted into the storage box 1703 through the connection of the connecting block 1701. When the squeezing position between the insertion rod 1702 and the locking ball 1707 is in an arc shape, the sliding rod 1704 and the spring 1705 are squeezed until the insertion rod 1702 slides into the locking groove 1708, so that the locking ball 1707 is locked and fixed in the "V"-shaped locking groove 1708, thereby achieving the effect of improving the stability of the connection between the bracket 5 and the calibration device when stored.

[0047] Furthermore, the storage box 1703 is arranged on the movement trajectory of the insertion rod 1702, and a slot is provided at the connection between the outer wall of the storage box 1703 and the insertion rod 1702, and the sliding rod 1704 is symmetrically arranged on both sides of the storage box 1703, which is conducive to setting the storage box 1703 on the movement trajectory of the insertion rod 1702, thereby playing a role in convenient engagement, storage and carrying between the bracket 5 and the different-zone magnetic field coil 1.

[0048] Furthermore, the extruded portion of the insertion rod 1702 and the card ball 1707 is in an arc shape, and the outer wall contour of the card slot 1708 is in a "V" shape. The storage box 1703 and the bracket 5 are arranged in a one-to-one correspondence, which is beneficial to the arc shape of the extruded portion of the insertion rod 1702 and the card ball 1707 and the "V" shape of the outer wall contour of the card slot 1708, so as to improve the stability of the connection between the bracket 5 and the calibration device when stored, thereby facilitating the carrying of the calibration device.

[0049] like Figure 1As shown, the field calibration device of the geomagnetic magnetometer with a different magnetic field coil is used. First, when the calibration device is conveniently moved to the measuring position through the bracket 5, in order to improve the stability of the support of the calibration device when the bracket 5 contacts the ground, according to the needs of the support area and the fixed position, the knob 8 is first rotated to drive the threaded slider 9 to slide along the inner wall of the fixed groove 10 through the rotation of the threaded rod 7. The sliding of the threaded slider 9 drives the connecting rod 12 fixedly connected to the telescopic rod 14 to perform telescopic movement through the connection of the rotating rod 11. At the same time, through the connection of the connecting rod 12, the telescopic plate 13 is driven to perform telescopic movement along the outer wall of the connecting box 6. According to the needs of the fixed position, the anchor 15 is rotated, so that under the connection between the anchor 15 and the ground, the bracket 5 is driven to stably support the ground, thereby achieving the effect of improving the support stability of the calibration device by the bracket 5.

[0050] Next, when the anchor 15 is adjusted to the fixed position on the ground through the telescopic movement of the telescopic plate 13, in order to improve the synchronous effect of scraping and cleaning the impurities on the surface of the ground to be fixed and facilitate the anchor 15 to be turned into the ground, the threaded slider 9 slides along the inner wall of the fixing groove 10, which will drive the threaded slider 9 to slide along the inner wall of the first limiting groove 1602 and drive the swing rod 1601 to rotate synchronously. The rotation of the swing rod 1601 will drive the cleaning scraper 1603 to slide synchronously along the inner wall of the slide groove 1605 under the connection of the second limiting groove 1604. The centering movement of the cleaning scraper 1603 can achieve the effect of effectively scraping and cleaning the soil impurities under the anchor 15.

[0051] Next, when the calibration device is supported and used by the bracket 5, in order to improve the stability of the bracket 5 when it is stored with the calibration device, when the bracket 5 is stored, the connection of the connecting block 1701 will drive the insertion rod 1702 to be inserted into the storage box 1703, and when the extrusion part of the insertion rod 1702 and the card ball 1707 is in an arc shape, the sliding rod 1704 and the spring 1705 are squeezed until the insertion rod 1702 slides into the card slot 1708, so that the card ball 1707 is engaged and fixed in the "V"-shaped card slot 1708, thereby achieving the effect of improving the stability of the connection between the bracket 5 and the calibration device when stored;

[0052] Finally, the heterogeneous magnetic field is used to generate two highly consistent uniform magnetic fields, the bracket 5 is used to fix the heterogeneous magnetic field coil 1 so that the axis is aligned with the geomagnetic direction, the steady-field magnetometer 2 is used to detect geomagnetic fluctuations, the automatic steady-field circuit 3 is used to lock the two uniform magnetic fields to the target value, and the standard magnetometer 4 is used to test the accurate magnetic field value of the uniform area used for calibration. During implementation, the heterogeneous magnetic field coil 1 is adjusted through the bracket 5 so that the coil axis is roughly aligned with the geomagnetic direction, the steady-field magnetometer 2 is used to detect the geomagnetic field value and pass it to the automatic steady-field circuit 3, the magnetic field is locked through the phase-locked loop, and the standard magnetometer 4 is placed in the working area, and calibration, testing, comparison and other measurement work can be carried out.

[0053] 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 field calibration device for a geomagnetic magnetometer using a different magnetic field coil, comprising a different magnetic field coil (1), characterized in that: The heterogeneous magnetic field coil (1) comprises a stabilizing field magnetometer (2), an automatic stabilizing field circuit (3), a standard magnetometer (4), a bracket (5), and a positioning mechanism arranged on the outer wall of the bracket (5); the stabilizing field magnetometer (2) is arranged on the inner wall of the heterogeneous magnetic field coil (1); the automatic stabilizing field circuit (3) is arranged at one end of the stabilizing field magnetometer (2); the standard magnetometer (4) located above the stabilizing field magnetometer (2) is arranged on the inner wall of the heterogeneous magnetic field coil (1); and the bracket (5) is rotatably connected to the outer wall of the heterogeneous magnetic field coil (1); The positioning mechanism includes a sliding component, a rotating component and a telescopic component; The sliding assembly comprises a threaded slider (9) and a fixing groove (10); the end of the bracket (5) is fixedly connected to a connection box (6); the inner wall of the connection box (6) is rotatably connected to a threaded rod (7); one end of the threaded rod (7) is fixedly connected to a knob (8) that fits the outer wall of the connection box (6); the outer wall of the threaded rod (7) is threadedly connected to a threaded slider (9) that is slidably connected to the outer wall of the connection box (6); and a fixing groove (10) is provided at a connection portion between the outer wall of the connection box (6) and the threaded slider (9); The rotating assembly comprises a rotating rod (11) and a connecting rod (12); the outer wall of the threaded slider (9) is rotatably connected to the rotating rod (11); one end of the rotating rod (11) is rotatably connected to the connecting rod (12) which is telescopically connected to the inner wall of the connecting box (6); The telescopic assembly comprises a telescopic plate (13), a telescopic rod (14) and an anchor nail (15); the outer wall of the connecting rod (12) is fixedly connected to the telescopic rod (14) which is fixedly connected to the inner wall of the connecting box (6); the outer wall of the connecting rod (12) is fixedly connected to the telescopic plate (13) which is slidably connected to the outer wall of the connecting box (6); and the outer wall of the telescopic plate (13) is threadedly connected to the anchor nail (15).

2. The field calibration device of a geomagnetic magnetometer with a different magnetic field coil according to claim 1, characterized in that: The bottom of the connection box (6) is provided with a cleaning mechanism (16), and the outer wall of the different-region magnetic field coil (1) is provided with a storage mechanism (17) located on the movement track of the bracket (5).

3. The field calibration device of a geomagnetic magnetometer with a different magnetic field coil according to claim 1, characterized in that: The threaded rods (7) are provided in two groups, the two groups of threaded rods (7) rotate in opposite directions, the rotating rods (11) and the threaded rods (7) are arranged in a one-to-one correspondence, the bracket (5) and the connecting box (6) are symmetrically arranged on both sides of the different-region magnetic field coil (1), the telescopic rod (14) is arranged above the threaded rod (7), and there is a spacing between the telescopic rod (14) and the threaded rod (7).

4. The on-site calibration device for a geomagnetic magnetometer with a different magnetic field coil according to claim 1, characterized in that: The different-region magnetic field coil (1) is a coil group composed of seven circular hollow coils, and two points 80 cm apart are arranged inside the different-region magnetic field coil (1) to generate a highly consistent uniform magnetic field. The stable field magnetometer (2) is specifically a self-excited optical pump magnetometer. The automatic stable field circuit (3) comprises a phase detector, a reference frequency source and a phase-locked loop circuit with feedback current output. The specific material of the bracket (5) is a non-magnetic material. The standard magnetometer (4) is specifically a proton magnetometer.

5. The on-site calibration device for a geomagnetic magnetometer with a magnetic field coil in a different region according to claim 2, characterized in that: The cleaning mechanism (16) comprises a swing rod (1601), a first limiting groove (1602), a cleaning scraper (1603), a second limiting groove (1604) and a sliding groove (1605); the outer wall of the cleaning mechanism (16) is provided with a swing rod (1601) slidably connected to the outer wall of the threaded slider (9); the rotation center of the swing rod (1601) is rotatably connected to the bottom of the connecting box (6) through a rotating shaft; the first limiting groove (1602) is provided at the connecting portion between the outer wall of the swing rod (1601) and the threaded slider (9); the outer wall of the swing rod (1601) is slidably connected to the cleaning scraper (1603) slidably connected to the bottom of the connecting box (6); the second limiting groove (1604) is provided at the connecting portion between the outer wall of the swing rod (1601) and the cleaning scraper (1603); and the sliding groove (1605) is provided at the connecting portion between the bottom of the connecting box (6) and the cleaning scraper (1603).

6. The on-site calibration device for a geomagnetic magnetometer with a magnetic field coil in a different region according to claim 5, characterized in that: The swing rods (1601) are provided in two groups, and the positions of the two groups of the swing rods (1601) are symmetrically distributed about the central axis of the connection box (6); the positions of the first limiting groove (1602) and the second limiting groove (1604) are equidistantly distributed about the rotation center of the swing rod (1601); the cleaning scrapers (1603) are symmetrically arranged on both sides of the connection box (6), and the cleaning scrapers (1603) are arranged on the movement trajectory of the anchor nail (15).

7. The on-site calibration device for a geomagnetic magnetometer with a magnetic field coil in a different region according to claim 2, characterized in that: The storage mechanism (17) comprises a connecting block (1701), an insert rod (1702), a storage box (1703), a sliding rod (1704), a spring (1705), a pull block (1706), a locking ball (1707) and a locking groove (1708); the outer wall of the bracket (5) is fixedly connected to the connecting block (1701); the outer wall of the connecting block (1701) is fixedly connected to the insert rod (1702); the outer wall of the different-region magnetic field coil (1) is fixedly connected to the storage box (1703) which is slidably connected to the outer wall of the insert rod (1702); the storage box (1703) is fixedly connected to the outer wall of the insert rod (1702); The outer wall of the storage box (1703) is slidably connected to a sliding rod (1704), the outer wall of the sliding rod (1704) is sleeved with a spring (1705) fixedly connected to the outer wall of the storage box (1703), one end of the spring (1705) is fixedly connected to a pull block (1706) fixedly connected to one end of the sliding rod (1704), one end of the sliding rod (1704) is fixedly connected to a locking ball (1707) engaged with the outer wall of the insertion rod (1702), and a locking groove (1708) is provided at the connection position between the outer wall of the insertion rod (1702) and the locking ball (1707).

8. The on-site calibration device for a geomagnetic magnetometer with a magnetic field coil in a different region according to claim 7, characterized in that: The storage box (1703) is arranged on the movement track of the insertion rod (1702), and a slot is provided at the connection position between the outer wall of the storage box (1703) and the insertion rod (1702), and the sliding rod (1704) is symmetrically arranged on both sides of the storage box (1703).

9. The on-site calibration device for a geomagnetic magnetometer with a magnetic field coil in a different region according to claim 7, characterized in that: The extrusion portion between the insertion rod (1702) and the locking ball (1707) is in an arc shape, the outer wall profile of the locking groove (1708) is in a "V" shape, and the storage box (1703) and the bracket (5) are arranged in a one-to-one correspondence.

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