CN112987116A - Well fixing device and method for underground water geophysical prospecting - Google Patents
Well fixing device and method for underground water geophysical prospecting Download PDFInfo
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- CN112987116A CN112987116A CN202110524875.1A CN202110524875A CN112987116A CN 112987116 A CN112987116 A CN 112987116A CN 202110524875 A CN202110524875 A CN 202110524875A CN 112987116 A CN112987116 A CN 112987116A
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
- G01V3/26—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device
- G01V3/28—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device using induction coils
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Abstract
The invention discloses a well fixing device and a well fixing method for underground water geophysical prospecting, which relate to the technical field of underground water exploration.
Description
Technical Field
The invention relates to the technical field of underground water exploration, in particular to a well fixing device and method for underground water geophysical prospecting.
Background
The underground water detector is used for exploring and searching bedrock water, fissure water, karst water and the like, and known underground water detecting methods include an indirect water detecting method and a direct water detecting method. Indirect methods for detecting underground water include physical methods such as an electrical method, a magnetic method and a gravity method. The direct water finding method is the nuclear magnetic resonance method.
The electric method for water detection is still the most economical, effective and widely applied method among various water detection methods. The method is widely applied to searching various types of underground water such as bedrock water, fissure water, karst water and the like at home and abroad, is also used in aspects such as metal and nonmetal mineral resource exploration, urban geophysical prospecting, railway bridge exploration and the like, is used for determining hidden danger positions of reservoir dams and flood control embankments and the like, and can also be used for geothermal exploration;
the american geological researchers have studied the work of surveying underground water sources with infrared light. According to the data, if a water source exists underground, the temperature change can be detected near the surface of the ground, and the existence or non-existence of the underground water source is judged according to the temperature change;
the ground nuclear Magnetic Resonance (MRS) method is the most direct method for detecting the underground water which is recognized by people. Compared with other water exploration methods, the MRS method mainly has the following remarkable advantages: firstly, underground water is directly detected; secondly, the information quantity obtained by measurement is rich and quantitative; thirdly, the method is economical, lossless and rapid;
nuclear magnetic resonance is the most direct and efficient method for exploring underground water sources, is less affected by geothermal heat, but nuclear magnetic resonance instruments are rarely used in actual water source exploration, and nuclear magnetic resonance devices which are small in size and convenient to detect are needed for exploring underground water sources because nuclear magnetic resonance instruments are large in equipment and complex to assemble compared with electrical water exploration and infrared water exploration and are not suitable for field exploration.
Disclosure of Invention
In order to solve the technical problem, the invention provides a well fixing device and a method for underground water geophysical prospecting.
The technical scheme of the invention is as follows: the well fixing device for the geophysical prospecting comprises a barrel, superconducting coils, liquid nitrogen bins, electronic boxes, detection rods, bases and electronic interfaces, wherein the liquid nitrogen bins are located inside the barrel, the superconducting coils are wound inside the liquid nitrogen bins, the number of the detection rods is four, the four detection rods are uniformly hinged above the outer wall of the barrel, the number of the bases is four, and the four bases are uniformly hinged to the bottom of the barrel; the electronic interface is electrically connected with the superconducting coil and the four detection rods respectively;
the detection rod comprises a first hinge piece, a third-stage telescopic rod, a second hinge piece and a magnetic induction detection head, wherein the upper end of the third-stage telescopic rod is hinged with the outer wall of the barrel through the first hinge piece, and the lower end of the third-stage telescopic rod is hinged with the magnetic induction detection head through the second hinge piece;
the base comprises a third hinge part, a rotating rod and a chassis, the upper end of the rotating rod is hinged to the lower part of the outer wall of the barrel through the third hinge part, the lower end of the rotating rod is hinged to the chassis, and a connecting buckle is arranged on the back of the chassis;
the electronic box includes transformer, low frequency current generator, computer, box, power port, the transformer is used for carrying out the pressure boost to conventional alternating current, and transformer fixed mounting is in the bottom of box, power port electric connection in the left side of transformer, and with external power source electric connection, low frequency current generator is used for falling the frequency to conventional alternating current, electric connection on the right side of transformer, and with superconducting coil electric connection, the computer is fixed on the transformer surface, with power port electric connection for handle the signal of telecommunication that the measuring staff detected, and form images through the computer screen.
Further, articulated elements one is including articulated seat one, pivot one, the spacing piece of elasticity one, an articulated seat fixed connection be in the outer wall upside of barrel, a rotation of pivot is connected on articulated seat one, the middle part of pivot one is fixed with limit gear one, the outer wall at the barrel is fixed to the spacing piece of elasticity one, and with a limit gear butt, the structure of articulated elements one is convenient for the fixed of tertiary telescopic link angle, and it is convenient to use.
Further, the articulated elements two is including articulated seat two, pivot two, the spacing piece two of elasticity, two fixed connection of articulated seat are in the end of tertiary telescopic link, two rotation of pivot are connected on articulated seat two, and the middle part of pivot two is fixed with limit gear two, two fixed connection of the spacing piece of elasticity are in on the shell of magnetic induction detection head, and with two butts of limit gear, the structure of articulated elements two is convenient for magnetic induction detects the fixed of head angle, and it is convenient to use, easy operation.
Further, the third hinge part comprises a third hinge seat, a third rotating shaft and a limiting nut, the third hinge seat is fixedly connected below the outer wall of the barrel, the third rotating shaft is rotatably connected to the third hinge seat, and the limiting nut is in threaded connection with the outer side of the rotating rod;
further, the connector link includes slide rail storehouse, annular knot, elastic groove, runs through the knot, slide rail storehouse fixed connection is at the back on any one chassis in four chassis, it has threely to run through the knot, three runs through to detain the back of fixed connection on all the other three chassis, elastic groove elastic connection is in the top in slide rail storehouse, the front end lower surface that the annular was detained is equipped with spacing platform, the lower surface in slide rail storehouse is equipped with spacing hole, spacing platform passes spacing hole is spacing, and the connector link is convenient for the fixing after the chassis is folded.
Furthermore, the upper surface of the cylinder is fixedly connected with a handle, a liquid nitrogen filling opening is formed in the upper portion of the outer wall of the cylinder, and a liquid nitrogen bin is filled with liquid nitrogen, so that the physical environment of the superconducting coil during working is guaranteed, and self-heating of the device is reduced.
Further, the device carries out a well positioning method, and comprises the following steps:
s1: placing the cylinder body at a point to be measured, turning the three-stage telescopic rod outwards and stretching the three-stage telescopic rod, and adjusting the angle between the three-stage telescopic rod and the cylinder body and the horizontal angles of the four magnetic induction detection heads to enable the four magnetic induction detection heads to be at the same horizontal position;
s2: pressing down the limiting table, opening the annular buckle, turning the chassis outwards, and adjusting the limiting nut to keep the lower surface of the cylinder body horizontal to the ground of the point to be measured;
s3: switching on a power supply to start a computer, adjusting parameters of a transformer and parameters of a low-frequency current generator, and performing nuclear magnetic resonance scanning on an underground water source;
s4: modeling the detection data obtained in the step S3 as an MRS signal parameter.
The nuclear magnetic resonance scan in the step S3 includes the following steps:
s31: setting a scanning range on a computer, performing power frequency harmonic modeling, searching power frequency points, and repeatedly scanning for 3-5 times;
s32: after each scanning, the signals of the four magnetic induction detection heads are compared, common detection signals are extracted, clutter is removed, after multiple scanning, the detected signals are subjected to autocorrelation calculation, and then multiple groups of superposition comparison calculation are carried out, so that the interference of random noise on the detection result is reduced.
Further, the variable voltage of the transformer is 220v-380 v.
Further, the alternating frequency of the low-frequency current generator is 0.8-2 Hz.
The invention has the beneficial effects that:
(1) the invention does not need to lay a coil, and workers only need to carry an instrument to carry out on-site measurement, thus the invention has the advantages of simple operation, low operation difficulty, light weight, convenient carrying and installation, shortened measurement time and reduced workload of the workers.
(2) The method adopted by the device can reduce the influence of environmental noise on the measurement result and improve the measurement precision.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the barrel of the present invention in an expanded configuration.
Fig. 3 is a cross-sectional view of the cartridge of the present invention.
Fig. 4 is a schematic structural view of a first hinge member.
Fig. 5 is a schematic structural view of the second hinge member.
Fig. 6 is a schematic structural view of a third hinge member.
Fig. 7 is a top view of a profile of the chassis of the present invention.
Fig. 8 is an enlarged view at a in fig. 6.
Wherein, 1-cylinder, 2-superconducting coil, 3-liquid nitrogen bin, 4-electronic box, 5-detection rod, 6-base, 7-electronic interface, 51-first hinge, 52-third telescopic rod, 53-second hinge, 54-magnetic induction detection head, 61-third hinge, 62-rotating rod, 63-chassis, 41-transformer, 42-low frequency current generator, 43-computer, 44-box, 45-power port, 511-first hinge seat, 512-first rotating shaft, 513-first elastic limit sheet, 514-first limit gear, 531-second hinge seat, 532-second rotating shaft, 533-second elastic limit sheet, 534-second limit gear, 611-third hinge seat, 612-third rotating shaft, and, 613-limit nut, 641-sliding rail bin, 642-annular buckle, 643-limit hole, 644-limit table, 645-elastic groove, 646-through buckle, 11-handle and 12-liquid nitrogen injection port.
Detailed Description
Example 1:
as shown in fig. 1-3, the well fixing device for underground water geophysical prospecting comprises a barrel body 1, superconducting coils 2, a liquid nitrogen bin 3, an electronic box 4, four detection rods 5, bases 6 and electronic interfaces 7, wherein the liquid nitrogen bin 3 is positioned inside the barrel body 1, the superconducting coils 2 are wound inside the liquid nitrogen bin 3, the number of the detection rods 5 is four, the four detection rods 5 are uniformly hinged above the outer wall of the barrel body 1, the number of the bases 6 is four, and the four bases 6 are uniformly hinged at the bottom of the barrel body 1; the electronic interface 7 is respectively electrically connected with the superconducting coil 2 and the four detection rods 5; the upper surface of the cylinder body 1 is fixedly connected with a handle 11, a liquid nitrogen filling opening 12 is formed in the upper portion of the outer wall of the cylinder body 1, and a liquid nitrogen bin 3 is filled with liquid nitrogen, so that the physical environment of the superconducting coil 2 during working is ensured, and the self-heating of the device is reduced;
the detection rod 5 comprises a first hinge part 51, a third-stage telescopic rod 52, a second hinge part 53 and a magnetic induction detection head 54, the upper end of the third-stage telescopic rod 52 is hinged with the outer wall of the barrel 1 through the first hinge part 51, and the lower end of the third-stage telescopic rod 52 is hinged with the magnetic induction detection head 54 through the second hinge part 53;
the base 6 comprises a third hinge part 61, a rotating rod 62 and a chassis 63, the upper end of the rotating rod 62 is hinged with the lower part of the outer wall of the cylinder body 1 through the third hinge part 61, the lower end of the rotating rod 62 is hinged with the chassis 63, and the back of the chassis 63 is provided with a connecting buckle 64;
the electronic box 4 comprises a transformer 41, a low-frequency current generator 42, a computer 43, a box 44 and a power port 45, wherein the transformer 41 is used for boosting the conventional alternating current, the transformer 41 is fixedly installed at the bottom of the box 44, the power port 45 is electrically connected to the left side of the transformer 41 and electrically connected with an external power supply, the low-frequency current generator 42 is used for reducing the frequency of the conventional alternating current and electrically connected to the right side of the transformer 41 and electrically connected with the superconducting coil 2, and the computer 43 is fixed on the surface of the transformer 41 and electrically connected with the power port 45 and used for processing the electric signal detected by the detection rod 5 and imaging through a screen of the computer 43.
The method for determining the well by using the device comprises the following steps:
s1: placing the barrel 1 at a point to be measured, turning the three-stage telescopic rod 52 outwards and stretching the three-stage telescopic rod 52, and adjusting the angle between the three-stage telescopic rod 52 and the barrel 1 and the horizontal angle between the four magnetic induction detection heads 54 to enable the four magnetic induction detection heads 54 to be at the same horizontal position;
s2: pressing down the limit table 644, opening the annular buckle 642, turning the chassis 63 outwards, and adjusting the limit nut 613 to keep the lower surface of the cylinder 1 horizontal to the ground of the point to be measured;
s3: switching on a power supply to start a computer 43, adjusting parameters of a transformer 41 and parameters of a low-frequency current generator 42, wherein the variable voltage of the transformer 41 is 220v, the alternating frequency of the low-frequency current generator 42 is 0.8Hz, and performing nuclear magnetic resonance scanning on the underground water source;
s31: setting a scanning range on a computer 43, performing power frequency harmonic modeling, searching power frequency points, and repeatedly scanning for 3 times;
s32: after each scanning, the signals of the four magnetic induction detection heads 54 are compared, common detection signals are extracted, clutter is removed, after multiple scanning, the detected signals are subjected to autocorrelation calculation, and then multiple groups of superposition comparison calculation are carried out for reducing the interference of random noise to the detection result
S4: modeling the detection data obtained in the step S3 as an MRS signal parameter.
Example 2:
as shown in fig. 1-3, the well fixing device for underground water geophysical prospecting comprises a barrel body 1, superconducting coils 2, a liquid nitrogen bin 3, an electronic box 4, four detection rods 5, bases 6 and electronic interfaces 7, wherein the liquid nitrogen bin 3 is positioned inside the barrel body 1, the superconducting coils 2 are wound inside the liquid nitrogen bin 3, the number of the detection rods 5 is four, the four detection rods 5 are uniformly hinged above the outer wall of the barrel body 1, the number of the bases 6 is four, and the four bases 6 are uniformly hinged at the bottom of the barrel body 1; the electronic interface 7 is respectively electrically connected with the superconducting coil 2 and the four detection rods 5; the upper surface of the cylinder body 1 is fixedly connected with a handle 11, a liquid nitrogen filling opening 12 is formed in the upper portion of the outer wall of the cylinder body 1, and a liquid nitrogen bin 3 is filled with liquid nitrogen, so that the physical environment of the superconducting coil 2 during working is ensured, and the self-heating of the device is reduced;
the detection rod 5 comprises a first hinge part 51, a third-stage telescopic rod 52, a second hinge part 53 and a magnetic induction detection head 54, the upper end of the third-stage telescopic rod 52 is hinged with the outer wall of the barrel 1 through the first hinge part 51, and the lower end of the third-stage telescopic rod 52 is hinged with the magnetic induction detection head 54 through the second hinge part 53;
as shown in fig. 4, the first hinge element 51 comprises a first hinge seat 511, a first rotating shaft 512 and a first elastic limiting piece 513, the first hinge seat 511 is fixedly connected to the upper side of the outer wall of the cylinder body 1, the first rotating shaft 512 is rotatably connected to the first hinge seat 511, a first limiting gear 514 is fixed in the middle of the first rotating shaft 512, the first elastic limiting piece 513 is fixed to the outer wall of the cylinder body 1 and is abutted against the first limiting gear 514, and the first hinge element 51 is convenient to fix the angle of the three-stage telescopic rod 52 and convenient to use;
as shown in fig. 5, the second hinge part 53 includes a second hinge seat 531, a second rotating shaft 532 and a second elastic limiting piece 533, the second hinge seat 531 is fixedly connected to the end of the third-stage telescopic rod 52, the second rotating shaft 532 is rotatably connected to the second hinge seat 531, a second limiting gear 534 is fixed in the middle of the second rotating shaft 532, the second elastic limiting piece 533 is fixedly connected to the housing of the magnetic induction detection head 54 and abuts against the second limiting gear 534, and the second hinge part 53 is convenient for fixing the angle of the magnetic induction detection head 54, so that the use is convenient and fast, and the operation is simple;
the base 6 comprises a third hinge part 61, a rotating rod 62 and a chassis 63, the upper end of the rotating rod 62 is hinged with the lower part of the outer wall of the cylinder body 1 through the third hinge part 61, the lower end of the rotating rod 62 is hinged with the chassis 63, and the back of the chassis 63 is provided with a connecting buckle 64;
the electronic box 4 comprises a transformer 41, a low-frequency current generator 42, a computer 43, a box 44 and a power port 45, wherein the transformer 41 is used for boosting the conventional alternating current, the transformer 41 is fixedly installed at the bottom of the box 44, the power port 45 is electrically connected to the left side of the transformer 41 and electrically connected with an external power supply, the low-frequency current generator 42 is used for reducing the frequency of the conventional alternating current and electrically connected to the right side of the transformer 41 and electrically connected with the superconducting coil 2, and the computer 43 is fixed on the surface of the transformer 41 and electrically connected with the power port 45 and used for processing the electric signal detected by the detection rod 5 and imaging through a screen of the computer 43.
The method for determining the well by using the device comprises the following steps:
s1: placing the barrel 1 at a point to be measured, turning the three-stage telescopic rod 52 outwards and stretching the three-stage telescopic rod 52, and adjusting the angle between the three-stage telescopic rod 52 and the barrel 1 and the horizontal angle between the four magnetic induction detection heads 54 to enable the four magnetic induction detection heads 54 to be at the same horizontal position;
s2: pressing down the limit table 644, opening the annular buckle 642, turning the chassis 63 outwards, and adjusting the limit nut 613 to keep the lower surface of the cylinder 1 horizontal to the ground of the point to be measured;
s3: switching on a power supply to start a computer 43, adjusting parameters of a transformer 41 and parameters of a low-frequency current generator 42, wherein the variable voltage of the transformer 41 is 300v, the alternating frequency of the low-frequency current generator 42 is 1Hz, and performing nuclear magnetic resonance scanning on an underground water source;
s31: setting a scanning range on a computer 43, performing power frequency harmonic modeling, searching power frequency points, and repeatedly scanning for 4 times;
s32: after each scanning, the signals of the four magnetic induction detection heads 54 are compared, common detection signals are extracted, clutter is removed, after multiple scanning, the detected signals are subjected to autocorrelation calculation, and then multiple groups of superposition comparison calculation are carried out for reducing the interference of random noise to the detection result
S4: modeling the detection data obtained in the step S3 as an MRS signal parameter.
Compared with the embodiment 1, the first hinge 51 and the second hinge 53 of the embodiment 2 are advantageous for fixing the angles of the three-stage telescopic rod 52 and the magnetic induction detection head 54.
Example 3:
as shown in fig. 1-3, the well fixing device for underground water geophysical prospecting comprises a barrel body 1, superconducting coils 2, a liquid nitrogen bin 3, an electronic box 4, four detection rods 5, bases 6 and electronic interfaces 7, wherein the liquid nitrogen bin 3 is positioned inside the barrel body 1, the superconducting coils 2 are wound inside the liquid nitrogen bin 3, the number of the detection rods 5 is four, the four detection rods 5 are uniformly hinged above the outer wall of the barrel body 1, the number of the bases 6 is four, and the four bases 6 are uniformly hinged at the bottom of the barrel body 1; the electronic interface 7 is respectively electrically connected with the superconducting coil 2 and the four detection rods 5; the upper surface of the cylinder body 1 is fixedly connected with a handle 11, a liquid nitrogen filling opening 12 is formed in the upper portion of the outer wall of the cylinder body 1, and a liquid nitrogen bin 3 is filled with liquid nitrogen, so that the physical environment of the superconducting coil 2 during working is ensured, and the self-heating of the device is reduced;
the detection rod 5 comprises a first hinge part 51, a third-stage telescopic rod 52, a second hinge part 53 and a magnetic induction detection head 54, the upper end of the third-stage telescopic rod 52 is hinged with the outer wall of the barrel 1 through the first hinge part 51, and the lower end of the third-stage telescopic rod 52 is hinged with the magnetic induction detection head 54 through the second hinge part 53;
as shown in fig. 4, the first hinge element 51 comprises a first hinge seat 511, a first rotating shaft 512 and a first elastic limiting piece 513, the first hinge seat 511 is fixedly connected to the upper side of the outer wall of the cylinder body 1, the first rotating shaft 512 is rotatably connected to the first hinge seat 511, a first limiting gear 514 is fixed in the middle of the first rotating shaft 512, the first elastic limiting piece 513 is fixed to the outer wall of the cylinder body 1 and is abutted against the first limiting gear 514, and the first hinge element 51 is convenient to fix the angle of the three-stage telescopic rod 52 and convenient to use;
as shown in fig. 5, the second hinge part 53 includes a second hinge seat 531, a second rotating shaft 532 and a second elastic limiting piece 533, the second hinge seat 531 is fixedly connected to the end of the third-stage telescopic rod 52, the second rotating shaft 532 is rotatably connected to the second hinge seat 531, a second limiting gear 534 is fixed in the middle of the second rotating shaft 532, the second elastic limiting piece 533 is fixedly connected to the housing of the magnetic induction detection head 54 and abuts against the second limiting gear 534, and the second hinge part 53 is convenient for fixing the angle of the magnetic induction detection head 54, so that the use is convenient and fast, and the operation is simple;
the base 6 comprises a third hinge part 61, a rotating rod 62 and a chassis 63, the upper end of the rotating rod 62 is hinged with the lower part of the outer wall of the cylinder body 1 through the third hinge part 61, the lower end of the rotating rod 62 is hinged with the chassis 63, and the back of the chassis 63 is provided with a connecting buckle 64;
as shown in fig. 7-8, the connecting buckle 64 includes a sliding rail bin 641, an annular buckle 642, three elastic grooves 645 and three penetrating buckles 646, the sliding rail bin 641 is fixedly connected to the back of any one chassis 63 among the four chassis 63, the three penetrating buckles 646 are fixedly connected to the backs of the other three chassis 63, the elastic grooves 645 are elastically connected above the sliding rail bin 641, a limiting table 644 is arranged on the lower surface of the front end of the annular buckle 642, a limiting hole 643 is arranged on the lower surface of the sliding rail bin 641, the limiting table 644 passes through the limiting hole 643 to limit, and the connecting buckle 64 facilitates the fixing of the folded chassis 63;
as shown in fig. 6, the third hinge element 61 includes a third hinge seat 611, a third rotating shaft 612, and a limit nut 613, the third hinge seat 611 is fixedly connected below the outer wall of the cylinder 1, the third rotating shaft 612 is rotatably connected to the third hinge seat 611, and the limit nut 613 is screwed to the outer side of the rotating rod 62;
the electronic box 4 comprises a transformer 41, a low-frequency current generator 42, a computer 43, a box 44 and a power port 45, wherein the transformer 41 is used for boosting the conventional alternating current, the transformer 41 is fixedly installed at the bottom of the box 44, the power port 45 is electrically connected to the left side of the transformer 41 and electrically connected with an external power supply, the low-frequency current generator 42 is used for reducing the frequency of the conventional alternating current and electrically connected to the right side of the transformer 41 and electrically connected with the superconducting coil 2, and the computer 43 is fixed on the surface of the transformer 41 and electrically connected with the power port 45 and used for processing the electric signal detected by the detection rod 5 and imaging through a screen of the computer 43.
The method for determining the well by using the device comprises the following steps:
s1: placing the barrel 1 at a point to be measured, turning the three-stage telescopic rod 52 outwards and stretching the three-stage telescopic rod 52, and adjusting the angle between the three-stage telescopic rod 52 and the barrel 1 and the horizontal angle between the four magnetic induction detection heads 54 to enable the four magnetic induction detection heads 54 to be at the same horizontal position;
s2: pressing down the limit table 644, opening the annular buckle 642, turning the chassis 63 outwards, and adjusting the limit nut 613 to keep the lower surface of the cylinder 1 horizontal to the ground of the point to be measured;
s3: switching on a power supply to start the computer 43, adjusting the parameters of the transformer 41 and the parameters of the low-frequency current generator 42, wherein the variable voltage of the transformer 41 is 380v, the alternating frequency of the low-frequency current generator 42 is 2Hz, and performing nuclear magnetic resonance scanning on the underground water source;
s31: setting a scanning range on a computer 43, performing power frequency harmonic modeling, searching power frequency points, and repeatedly scanning for 5 times;
s32: after each scanning, the signals of the four magnetic induction detection heads 54 are compared, common detection signals are extracted, clutter is removed, after multiple scanning, the detected signals are subjected to autocorrelation calculation, and then multiple groups of superposition comparison calculation are carried out for reducing the interference of random noise to the detection result
S4: modeling the detection data obtained in the step S3 as an MRS signal parameter.
Compared with the embodiment 2, the angle of the base 6 can be adjusted conveniently by the structure of the third hinge part 61 in the embodiment 3, and the chassis 63 can be effectively fixed by the structure of the connecting buckle 64 after the base 6 is folded; in comparative examples 1 to 3, the measurement accuracy of example 3 was the highest when the measurement was performed in the field using the present apparatus.
In the above embodiments, the magnetic induction detection head 54, the transformer 41, the low-frequency current generator 42, the computer 43, the power port 45, and the electronic interface 7 are all commercially available products, as long as the functions of the present invention can be realized, and those skilled in the art can select and use the magnetic induction detection head according to the general knowledge, and are not limited herein.
Claims (10)
1. The well fixing device for the underground geophysical prospecting is characterized by comprising a barrel (1), four superconducting coils (2), a liquid nitrogen bin (3), an electronic box (4), four detection rods (5), four bases (6) and an electronic interface (7), wherein the liquid nitrogen bin (3) is located inside the barrel (1), the superconducting coils (2) are wound inside the liquid nitrogen bin (3), the four detection rods (5) are uniformly hinged above the outer wall of the barrel (1), the four bases (6) are uniformly hinged to the bottom of the barrel (1); the electronic interface (7) is respectively and electrically connected with the superconducting coil (2) and the four detection rods (5);
the detection rod (5) comprises a first hinge part (51), a third-stage telescopic rod (52), a second hinge part (53) and a magnetic induction detection head (54), the upper end of the third-stage telescopic rod (52) is hinged with the outer wall of the barrel body (1) through the first hinge part (51), and the lower end of the third-stage telescopic rod (52) is hinged with the magnetic induction detection head (54) through the second hinge part (53);
the base (6) comprises a third hinge part (61), a rotating rod (62) and a chassis (63), the upper end of the rotating rod (62) is hinged to the lower portion of the outer wall of the barrel body (1) through the third hinge part (61), the lower end of the rotating rod (62) is hinged to the chassis (63), and a connecting buckle (64) is arranged on the back of the chassis (63);
electronic box (4) include transformer (41), low frequency current generator (42), computer (43), box (44), power port (45), transformer (41) are used for carrying out the pressure boost to conventional alternating current, and transformer (41) fixed mounting is in the bottom of box (44), power port (45) electric connection is in the left side of transformer (41), and with external power electric connection, low frequency current generator (42) are used for falling the frequency to conventional alternating current, electric connection is on the right side of transformer (41), and with superconducting coil (2) electric connection, computer (43) are fixed on transformer (41) surface, and with power port (45) electric connection for handle the signal of telecommunication that detects pole (5) detected, and carry out the formation of image through computer (43) screen.
2. The underground water geophysical prospecting well fixing device as claimed in claim 1, wherein the first hinge piece (51) comprises a first hinge seat (511), a first rotating shaft (512) and a first elastic limiting piece (513), the first hinge seat (511) is fixedly connected to the upper side of the outer wall of the barrel body (1), the first rotating shaft (512) is rotatably connected to the first hinge seat (511), a first limiting gear (514) is fixed to the middle of the first rotating shaft (512), and the first elastic limiting piece (513) is fixed to the outer wall of the barrel body (1) and abuts against the first limiting gear (514).
3. The underground water geophysical prospecting well fixing device as claimed in claim 1, wherein the second hinge member (53) comprises a second hinge seat (531), a second rotating shaft (532) and a second elastic limiting piece (533), the second hinge seat (531) is fixedly connected to the tail end of the third-stage telescopic rod (52), the second rotating shaft (532) is rotatably connected to the second hinge seat (531), a second limiting gear (534) is fixed to the middle of the second rotating shaft (532), and the second elastic limiting piece (533) is fixedly connected to the shell of the magnetic induction detection head (54) and is abutted to the second limiting gear (534).
4. The underground water geophysical prospecting well fixing device as claimed in claim 1, wherein the third hinge part (61) comprises a third hinge seat (611), a third rotating shaft (612) and a limit nut (613), the third hinge seat (611) is fixedly connected below the outer wall of the barrel body (1), the third rotating shaft (612) is rotatably connected to the third hinge seat (611), and the limit nut (613) is in threaded connection with the outer side of the rotating rod (62).
5. The underground water geophysical prospecting well setting device as claimed in claim 1, wherein the connecting buckle (64) comprises a sliding rail bin (641), three ring-shaped buckles (642), an elastic groove (645) and a penetrating buckle (646), the sliding rail bin (641) is fixedly connected to the back surface of any one chassis (63) of the four chassis (63), the number of the penetrating buckles (646) is three, the three penetrating buckles (646) are fixedly connected to the back surfaces of the other three chassis (63), the elastic groove (645) is elastically connected above the sliding rail bin (641), a limiting table (644) is arranged on the lower surface of the front end of the ring-shaped buckle (642), a limiting hole (643) is arranged on the lower surface of the sliding rail bin (641), and the limiting table (644) penetrates through the limiting hole (643) for limiting.
6. The underground water geophysical prospecting well fixing device as claimed in claim 1, wherein a handle (11) is fixedly connected to the upper surface of the cylinder body (1), and a liquid nitrogen injection opening (12) is formed above the outer wall of the cylinder body (1).
7. A method of geophysical prospecting using the device of any one of claims 1-6, including the steps of:
s1: placing the barrel body (1) at a point to be measured, turning the three-stage telescopic rod (52) outwards and stretching the three-stage telescopic rod (52), and adjusting the angle between the three-stage telescopic rod (52) and the barrel body (1) and the horizontal angle between the four magnetic induction detection heads (54) to enable the four magnetic induction detection heads (54) to be at the same horizontal position;
s2: pressing down the limiting table (644), opening the annular buckle (642), turning the chassis (63) outwards, and adjusting the limiting nut (613) to keep the lower surface of the cylinder (1) horizontal to the ground of the point to be measured;
s3: switching on a power supply to turn on a computer (43), adjusting parameters of a transformer (41) and parameters of a low-frequency current generator (42), and performing nuclear magnetic resonance scanning on the underground water source;
s4: modeling the detection data obtained in the step S3 as an MRS signal parameter.
8. The method as set forth in claim 7, wherein the nuclear magnetic resonance scan in step S3 includes the steps of:
s31: setting a scanning range on a computer (43), performing power frequency harmonic modeling, searching power frequency points, and repeatedly scanning for 3-5 times;
s32: after each scanning, the signals of the four magnetic induction detection heads (54) are compared, common detection signals are extracted, clutter is removed, after multiple scanning, the detected signals are subjected to autocorrelation calculation, and then multiple groups of superposition comparison calculation are carried out, so that the interference of random noise on the detection result is reduced.
9. The method according to claim 7, characterized in that the variable voltage of the transformer (41) is 220v-380 v.
10. The method according to claim 7, characterized in that the low-frequency current generator (42) alternates with a frequency of 0.8-2 Hz.
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