Full-aviation transient electromagnetic detection pod

Abstract

The utility model provides a full-aviation transient electromagnetic detection pod. A transmitting coil is arranged at the bottom of an aircraft; the receiving coil is arranged on the inner side of the transmitting coil; the pod body comprises a first fixing ring, a rope assembly and a beam, the first fixing ring is connected with an aircraft through the rope assembly, the beam penetrates through the center of the first fixing ring, the two ends of the beam are fixedly connected with the first fixing ring, the receiving coil is fixedly connected with the beam, and the transmitting coil is arranged on the first fixing ring. The first fixing ring comprises a bending part which is curled to form a closed ring, the two ends of the bending part are locked and released through a positioning piece, the first fixing ring penetrates through the positioning piece to form a free end, and when the positioning piece releases the bending part, the bending degree of the bending part and the length of the free end can be adjusted so as to change the radial size of the closed ring. Due to the fact that the size of the pod body and the size of the transmitting coil are flexible and adjustable, the pod can obtain appropriate detection depth and detection resolution in different detection scenes, and the use cost of the pod is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transient electromagnetic detection, in particular to a full-airborne transient electromagnetic detection pod. BACKGROUND

[0002] Full-airborne transient electromagnetic detection is a geophysical exploration technology, which uses a transmitter carried by an aircraft to pass transient current to a transmitting coil in the pod, thereby transmitting a transient electromagnetic field to the underground, and then uses a receiving coil of the pod to receive secondary field change data, a receiver carried by the aircraft can collect and record the secondary field change data, and the secondary field change data is analyzed later to infer the characteristics of the underground medium.

[0003] The transmitting coil of the pod is usually designed as a planar coil, a larger transmitting coil can generate a stronger electromagnetic field, which is conducive to detecting deeper strata, and a smaller coil is more suitable for high-resolution detection of shallow strata. Therefore, for different detection scenarios, multiple pods with transmitting coils of different sizes are often prepared to select a transmitting coil of appropriate size, resulting in high procurement and maintenance costs of the transmitting coil and other pod components; in addition, replacing the transmitting coil and other pod components in an outdoor harsh environment has the problem of high construction difficulty. SUMMARY

[0004] The present application is proposed based on the above needs of the prior art, and the technical problem to be solved by the present application is to provide a full-airborne transient electromagnetic detection pod, the size of the pod body and the transmitting coil is flexible and adjustable, which can obtain appropriate detection depth and detection resolution in different detection scenarios, and reduces the use cost of the pod.

[0005] In order to solve the above problems, the present application provides the following technical solutions.

[0006] The application provides a full-airborne transient electromagnetic detection pod, which comprises a pod body, a transmitting coil and a receiving coil; the transmitting coil is arranged at the bottom of an aircraft and connected with a transmitter to input a transient current; the receiving coil is arranged inside the transmitting coil and connected with a receiver to detect a secondary field attenuation signal; the pod body comprises a first fixing ring, a rope assembly and a crossbeam, wherein the first fixing ring is connected with the aircraft through the rope assembly, the crossbeam passes through the center of the first fixing ring, the two ends of the crossbeam are fixedly connected with the first fixing ring, the receiving coil is fixedly connected with the crossbeam, the transmitting coil is arranged on the first fixing ring, the first fixing ring comprises a bending part which is curled to form a closed ring, the two ends of the bending part are locked and released through a positioning member, the bending part passes through the positioning member and extends to form a free end, and when the positioning member releases the bending part, the bending degree of the bending part and the length of the free end can be adjusted to change the radial size of the closed ring.

[0007] Further, the closed ring is a circular ring with a diameter ranging from 3 to 15 meters.

[0008] Further, the first fixing ring comprises a plurality of bending parts, and the plurality of bending parts are curled to form a closed ring, and the two ends of each bending part are locked and released through the positioning member.

[0009] Further, the pod body comprises a second fixing ring arranged between the first fixing ring and the receiving coil, and the second fixing ring is fixedly connected with the crossbeam; the full-airborne transient electromagnetic detection pod comprises a compensation coil arranged on the second fixing ring, and the compensation coil is electrically connected with the transmitting coil and has an opposite current direction.

[0010] Further, the second fixing ring comprises a bending part curled to form a closed ring, and the two ends of the bending part are locked and released through a positioning member, and the bending part passes through the positioning member and extends to form a free end.

[0011] Further, the second fixing ring comprises a plurality of bending parts, and the plurality of bending parts are curled to form a closed ring, and the two ends of each bending part are locked and released through the positioning member.

[0012] Further, the rope assembly comprises a first central hub, a second central hub, a central rope, a horizontal tension rope and a diagonal tension rope, wherein the first central hub is coaxially arranged with the first fixing ring; the second central hub is arranged between the first central hub and the aircraft; the central rope vertically passes through the second central hub to connect the aircraft and the first central hub; the horizontal tension rope is used to connect the first central hub and the first fixing ring, and the diagonal tension rope is used to connect the second central hub and the first fixing ring.

[0013] Further, the number of the horizontal tension rope and the diagonal tension rope is multiple, the multiple horizontal tension ropes are uniformly distributed around the first central hub, and the multiple diagonal tension ropes are uniformly distributed around the second central hub.

[0014] Further, the positioning member comprises a first connecting block and a first locking screw, and the number of the first connecting block is two, when the two first connecting blocks are connected by the first locking screw, the two first connecting blocks form a gap for passing through the two ends of the curved part and the transmitting coil.

[0015] Further, the gondola body is made of non-metal material.

[0016] The beneficial effects of the present application include:

[0017] (1) Since the bending degree of the curved part and the length of the free end are flexible and adjustable, the size of the gondola body and the transmitting coil can also be freely adjusted, so that suitable detection depth and detection resolution can be obtained in different detection scenarios, thus there is no need to prepare multiple transmitting coils and other gondola assemblies of different sizes, which reduces the procurement cost and maintenance cost. Compared with the traditional full-airborne transient electromagnetic detection gondola, there is no need to replace the transmitting coil and other gondola components in the outdoor harsh environment, the operation of adjusting the first fixing ring and the size of the whole gondola is simple, and the use convenience is improved.

[0018] (2) When the first fixing ring is composed of multiple rod members, the fixing ring comprises multiple curved parts and multiple free ends, the two ends of the multiple curved parts can be locked and released by the positioning member, so that the operation of adjusting the transmitting coil, the compensation coil and the overall size of the gondola is more convenient and flexible; by increasing or reducing the number of rod members, or replacing rod members of different lengths and curling degrees, fixing rings of different size ranges can be obtained, thereby expanding the detection scenarios applicable to the gondola.

[0019] (3) The first fixed ring, the receiving coil, the second fixed ring and the crossbeam have rigidity and can transmit the thrust and the pull force acting on the pod, thereby avoiding the pod from tilting and deforming under external force, improving the structural stability of the pod and the accuracy of the detection results. During use of the pod, the rope assembly can stretch the first fixed ring in two central directions, so that the pod as a whole is in a conical shape. The conical structure has strong stability and can more effectively avoid deformation of the pod under external force.

[0020] (4) The pod body is made of non-metallic material. Compared with the pod assembly made of metal materials such as aluminum alloy and titanium alloy, the pod assembly made of non-metallic material has the characteristics of light weight, which is conducive to the lightweight of the pod; and the pod assembly made of non-metallic material has good electrical insulation, which can effectively reduce electromagnetic interference. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present specification, the drawings needed in the specific embodiments will be briefly introduced below. Obviously, the drawings described below are only some specific embodiments described in the present specification, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0022] Figure 1 is a schematic diagram of the pod structure in the specific embodiment.

[0023] Figure 2 is a schematic diagram of the local enlarged structure at A in the specific embodiment.

[0024] Figure 3 is a schematic diagram of the positioning member, the bending part and the free end connection structure in the specific embodiment.

[0025] Figure 4 is a schematic diagram of the second connecting member, the first fixed ring and the transmitting coil connection structure in the specific embodiment.

[0026] Figure 5 is a schematic diagram of the local enlarged structure at B in the specific embodiment.

[0027] Figure 6 is a schematic diagram of the local enlarged structure at C in the specific embodiment.

[0028] Figure 7 is a schematic diagram of the first connecting member and the receiving coil connection structure in the specific embodiment.

[0029] Figure 8 is a schematic diagram of the local enlarged structure at D in the specific embodiment.

[0030] Figure 9 is a schematic diagram of the local enlarged structure at E in the specific embodiment.

[0031] Reference signs:

[0032] 100, gondola body; 110, first fixing ring; 120, rope assembly; 121, first center hub; 122, second center hub; 123, center rope; 124, cross rope; 125, inclined rope; 130, crossbeam; 140, second fixing ring; 150, bending part; 160, free end; 170, positioning piece; 171, first connecting block; 172, first locking screw; 180, first connecting piece; 181, second connecting block; 182, second locking screw; 190, second connecting piece; 191, opening; 192, through hole; 193, third locking screw; 200, transmitting coil; 300, receiving coil; 400, compensating coil. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings. Obviously, the embodiments described in the present application are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] As shown in Figure 1 , Figure 2 and Figure 6 , the present embodiment discloses a full-airborne transient electromagnetic detection gondola, applied to aircrafts such as unmanned aerial vehicles and helicopters, the full-airborne transient electromagnetic detection gondola comprising a gondola body 100, a transmitting coil 200 and a receiving coil 300.

[0035] The transmitting coil 200 and the receiving coil 300 can be wound by multiple turns of metal wires, and the metal wires are wrapped with insulating materials. The shape of the transmitting coil 200 and the receiving coil 300 includes a circular ring, a square ring, etc. The aircraft carries a transmitter, which can generate a transient current. The transmitting coil 200 arranged at the bottom of the aircraft is connected to the output end of the transmitter through a conductive element to pass in the transient current, so as to emit a transient electromagnetic field to the underground, and then the receiving coil 300 of the gondola is used to receive the secondary field change data. The receiver carried by the aircraft can collect and record the secondary field change data, and the secondary field change data is analyzed in the later stage to infer the characteristics of the underground medium.

[0036] The gondola body 100 is a main structure of the gondola, and the gondola body 100 comprises a first fixing ring 110 for fixing the transmitting coil 200, the first fixing ring 110 is connected with the aircraft through a rope assembly 120, a crossbeam 130 passes through the center of the first fixing ring 110, two ends of the crossbeam 130 are fixedly connected with the first fixing ring 110, and the receiving coil 300 is fixedly connected with the crossbeam 130. The transmitting coil 200 can be arranged outside the first fixing ring 110, or arranged inside the first fixing ring 110 in a tubular shape, or arranged on the first fixing ring 110 by winding, binding or adhesion.

[0037] As shown in Figure 3 The first fixing ring 110 comprises a bending part 150 which is curled to form a closed ring, two ends of the bending part 150 are locked and released through a positioning member 170, and the bending part 150 passes through the positioning member 170 and extends to form a free end 160. In the embodiment, the first fixing ring 110 is a round rod with a cross-sectional diameter of 15 mm, the length of the first fixing ring 110 after unfolding is 25.12 m, and the first fixing ring 110 comprises the bending part 150 and the free end 160, wherein the length of the bending part 150 is 18.84 m, the length of the free end 160 is 6.28 m, and the bending part 150 is curled to form a round ring with a diameter of 6 m. When the two ends of the bending part 150 are released by the positioning member 170, the bending degree of the bending part 150 is adjustable, so that the length of the free end 160 changes in the range of 0-15.7 m, thereby the diameter of the round ring can be freely adjusted in the range of 3-8 m. When the two ends of the bending part 150 are locked by the positioning member 170, the diameter of the round ring is locked in the range of 3-8 m.

[0038] Since the bending degree of the bending part 150 and the length of the free end 160 are flexibly adjustable, the size of the gondola body 100 and the transmitting coil 200 can also be freely adjusted, so that appropriate detection depth and detection resolution can be obtained in different detection scenarios, thereby it is not necessary to prepare multiple transmitting coils 200 and other gondola components with different sizes, and the procurement cost and maintenance cost are reduced. Compared with the conventional full-airborne transient electromagnetic detection gondola, the embodiment does not need to replace the transmitting coil 200 and other gondola components in the outdoor harsh environment, the operation of adjusting the first fixing ring 110 and the entire gondola size is simple, and the use convenience is improved.

[0039] In addition, the first fixing ring 110, the receiving coil 300 and the crossbeam 130 have rigidity and can transmit the thrust and tension acting on the gondola, so that the gondola is prevented from tilting and deforming under external force, and the structural stability of the gondola and the accuracy of the detection result are improved.

[0040] Further, the first fixing ring 110 can include a plurality of bending portions 150, the plurality of bending portions 150 being curled to form a closed ring, and two ends of each bending portion 150 being locked and released by the positioning member 170. For example, the first fixing ring 110 can include only one round bar with a length of 18.84 meters, the bending portion 150 of the first fixing ring 110 having a length of 9.42 meters, and the free end 160 having a length of 9.42 meters, the bending portion 150 being curled to form a circular ring with a diameter of 3 meters. When a pod with a larger size is needed to be used, three round bars with a length of 9.42 meters can be added, and the total length of the four round bars after being unfolded is 47.1 meters, the free end 160 of each of the four round bars being adjusted to 0 meter, and the four bending portions 150 being curled to form a circular ring with a diameter of 15 meters.

[0041] When the first fixing ring 110 is composed of a plurality of rod members, the first fixing ring 110 includes a plurality of bending portions 150 and a plurality of free ends 160, two ends of each bending portion 150 being able to be locked and released by the positioning member 170, so that the operation of adjusting the size of the launch coil 200 and the whole pod is more convenient and flexible; by increasing or reducing the number of rod members, or replacing rod members with different lengths and curling degrees, first fixing rings 110 with different size ranges can be obtained, thereby expanding the applicable detection scenarios of the pod.

[0042] Further, the positioning member 170 can include a first connecting block 171 and a first locking screw 172 as shown in Figure 3 When the two first connecting blocks 171 are connected by the first locking screw 172, they form a gap for passing through the two ends of the bending portion 150 and the launch coil 200. In the specific embodiment, both of the two first connecting blocks 171 are provided with through holes, the first locking screw 172 is able to pass through the two through holes, one end of the first locking screw 172 is connected with a nut, and the two opposite surfaces of the two first connecting blocks 171 are provided with grooves, the two grooves form a gourd-shaped gap. When the nut is loosened, the two grooves are away from each other, the gourd-shaped gap is opened, the two ends of the bending portion 150 are released, and the radial size of the closed ring curled by the bending portion 150 can be freely adjusted; when the nut is tightened, the gourd-shaped gap is closed, the surfaces of the two grooves are tightly fitted with the surface of the first fixing ring 110, so as to limit the movement of the bending portion 150 and the free end 160 in the gourd-shaped gap, the bending degree of the bending portion 150 and the length of the free end 160 are locked, and thus the launch coil 200 and the whole pod are adjusted to a suitable size.

[0043] In order to facilitate the installation of the receiving coil 300, the cross beam 130 is provided with a first connecting block 131 and a first locking screw 132 as shown in Figure 6 and Figure 7The first connecting piece 180 is shown. The first connecting piece 180 includes two second connecting blocks 181 and a second locking screw 182. The two second connecting blocks 181 are provided with threaded holes, and the threaded holes are provided with internal threads matched with the second locking screw 182. The two second connecting blocks 181 are connected together by the second locking screw 182. The opposite surfaces of the two second connecting blocks 181 are provided with grooves, and the two second connecting blocks 181 form a cross-shaped gap for the receiving coil 300 and the cross beam 130 to pass through. When the second locking screw 182 is tightened, the receiving coil 300 and the cross beam 130 are limited in the cross-shaped gap to achieve fixed connection of the receiving coil 300 and the cross beam 130.

[0044] The structure of the rope assembly 120 is shown in Figure 1 , which includes a first central hub 121, a second central hub 122, a central rope 123, a horizontal pull rope 124, and a diagonal pull rope 125. The first central hub 121 is coaxially arranged with the first fixed ring 110. The second central hub 122 is arranged between the first central hub 121 and the aircraft. The central rope 123 is vertically arranged through the second central hub 122 to connect the aircraft and the first central hub 121. The horizontal pull rope 124 is used to connect the first central hub 121 and the first fixed ring 110. The diagonal pull rope 125 is used to connect the second central hub 122 and the first fixed ring 110.

[0045] As shown in Figure 8 , the first central hub 121 includes a cylindrical fixed disc coaxially arranged with the first fixed ring 110, and a flange arranged on the side wall of the cylindrical fixed disc. The flange is provided with a plurality of holes for connecting the horizontal pull rope 124.

[0046] As shown in Figure 1 and Figure 5 , the second central hub 122 is a disc arranged between the first central hub 121 and the aircraft. The disc is provided with a plurality of holes for connecting the diagonal pull rope 125. One end of the central rope 123 is fixedly connected with the aircraft, and the other end of the central rope 123 passes through the second central hub 122 and is connected with the cylindrical fixed disc of the first central hub 121.

[0047] As shown in Figure 2 , Figure 4 and Figure 8As shown, the first fixed ring 110 is provided with a second connecting piece 190 for connecting the horizontal pull rope 124 and the inclined pull rope 125, one side of the second connecting piece 190 is provided with an opening 191, the second connecting piece 190 is provided with a through hole 192 in communication with the opening 191, the cross section of the through hole 192 is in the shape of a calabash, the second connecting piece 190 further includes a third locking screw 193 for adjusting the size of the opening 191 and the through hole 192, when the third locking screw 193 is loosened, the size of the opening 191 and the through hole 192 increases, the transmitting coil 200 and the first fixed ring 110 can be sent into the through hole 192 through the opening 191, the length of the transmitting coil 200 can be freely adjusted relative to the first fixed ring 110 and the second connecting piece 190; while the third locking screw 193 is tightened, the inner surface of the through hole 192 closely fits the first fixed ring 110, thereby limiting the movement of the second connecting piece 190 relative to the first fixed ring 110. The number of the second connecting pieces 190 is eight, the eight second connecting pieces 190 are evenly distributed on the first fixed ring 110, the two ends of the four horizontal pull ropes 124 are respectively connected with the first center hub 121 and the four second connecting pieces 190, and the two ends of the eight inclined pull ropes 125 are respectively connected with the second center hub 122 and the eight second connecting pieces 190. The crossbeam 130 is a circular rod with a diameter of 12 mm, the number of the crossbeams 130 is two, the two crossbeams 130 are arranged in a cross shape in the first fixed ring 110, the centers of the two crossbeams 130 pass through the cylindrical fixed disc of the first center hub 121, and the two ends of the two crossbeams 130 are fixedly connected with the four second connecting pieces 190. It should be noted that the second connecting piece 190 can have a similar structure to the positioning piece 170, so as to facilitate the installation of the horizontal pull rope 124, the inclined pull rope 125 and the crossbeam 130; and the positioning piece 170 can also have a similar structure to the second connecting piece 190, so as to realize the flexible adjustment of the size of the bending part 150, the transmitting coil 200 and the compensation coil 400.

[0048] When the full-airborne transient electromagnetic detection pod is used for detection, the aircraft lifts the first fixed ring 110 through the rope assembly 120, the horizontal pull rope 124 can stretch the first fixed ring 110 towards the first center hub 121, and the inclined pull rope 125 can stretch the first fixed ring 110 towards the first center hub 121, so that the whole pod presents a conical shape during use. The stability of the conical structure is strong, which can more effectively avoid deformation of the pod under external force.

[0049] In the specific embodiment, the pod further includes a Figure 6 and Figure 9The second fixing ring 140 and the compensation coil 400 are shown. The second fixing ring 140 is arranged between the first fixing ring 110 and the receiving coil 300, and is fixedly connected with the cross beam 130. The compensation coil 400 is arranged in the second fixing ring 140, and is electrically connected with the transmitting coil 200 and has opposite current directions. When the transmitting coil 200 passes through the transient current, a primary field is generated. The compensation coil 400 passes through the reverse current to generate an electromagnetic field opposite to the direction of the primary electromagnetic field. The two form partial offset at the position of the receiving coil 300, thereby reducing the primary electromagnetic field intensity at the receiving coil 300 and improving the detection sensitivity of the secondary field.

[0050] Specifically, the compensation coil 400 is also wound by multiple turns of metal wires. The metal wires of the compensation coil 400 are connected with the metal wires of the transmitting coil 200. The winding mode of the metal wires makes the compensation coil 400 have opposite current directions with the transmitting coil 200. The second fixing ring 140 is in the shape of a circular ring. The second fixing ring 140 is fixed with the cross beam 130 through four second connecting pieces 190. The second fixing ring 140 is crimped by a hollow rod. The compensation coil 400 is arranged in the center through hole of the second fixing ring 140. The length of the compensation coil 400 can be freely adjusted relative to the second fixing ring 140.

[0051] In order to realize flexible adjustment of the size of the compensation coil 400, the second fixing ring 140 can also include a bending part 150 crimped to form a closed ring. The two ends of the bending part 150 are locked and released through the positioning piece 170. The bending part 150 passes through the positioning piece 170 and extends to form a free end 160. Since the bending degree of the bending part 150 and the length of the free end 160 can be adjusted, the size of the first fixing ring 110, the transmitting coil 200, the second fixing ring 140 and the compensation coil 400 can be freely adjusted. The gondola in the embodiment can obtain appropriate detection depth and detection resolution in different detection scenes, and has high detection sensitivity.

[0052] Specifically, the second fixing ring 140 is composed of a hollow circular rod with a cross-sectional diameter of 12 mm. The second fixing ring 140 has an unfolded length of 5.495 m, a length of the curved portion 150 of 3.925 m, and the curved portion 150 is curled to form a circular ring with a diameter of 1.25 m. The length of the free end 160 is 1.57 m. When the positioning member 170 releases the two ends of the curved portion 150 of the second fixing ring 140, the degree of bending of the curved portion 150 can be adjusted, so that the length of the free end 160 of the second fixing ring 140 changes in the range of 0-3.14 m, so that the diameter of the circular ring of the second fixing ring 140 can be freely adjusted in the range of 0.75-1.75 m; when the two ends of the curved portion 150 of the second fixing ring 140 are locked by the positioning member 170, the diameter of the circular ring is locked in the range of 0.75-1.75 m.

[0053] The second fixing ring 140 can also include multiple curved portions 150, that is, the second fixing ring 140 is composed of multiple rod members. The multiple curved portions 150 are curled to form a closed ring, and the two ends of each curved portion 150 are locked and released by the positioning member 170, which not only makes the operation of adjusting and compensating the size of the coil 400 and the whole pod more convenient and flexible, but also can obtain the second fixing ring 140 with different size ranges by increasing or reducing the number of rod members, or replacing rod members with different lengths and curling degrees, thereby further expanding the detection scenarios applicable to the pod.

[0054] In the specific embodiment, the pod body 100 is made of a non-metal material. For example, the first fixing ring 110, the second fixing ring 140, and the cross beam 130 are all glass fiber rods, which have excellent tensile strength and impact resistance; the center rope 123, the horizontal pull rope 124, and the inclined pull rope 125 are all nylon ropes; the main body materials of the first center hub 121, the second center hub 122, the positioning member 170, the first connecting member 180, and the second connecting member 190 are all POM, and the screws, the first locking screw 172, the second locking screw 182, and the third locking screw 193 are all PEEK materials. Compared with pod components made of metal materials such as aluminum alloy and titanium alloy, the pod components made of non-metal materials have the characteristics of light weight, which is conducive to the lightweight of the pod; and the pod components made of non-metal materials have good electrical insulation, which can effectively avoid electromagnetic interference.

[0055] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An airborne transient electromagnetic surveying pod, characterized in that, The gondola body (100), the transmitting coil (200) and the receiving coil (300); The transmitting coil (200) is arranged at the bottom of the aircraft, and the transmitting coil (200) is connected with a transmitter to input a transient current; The receiving coil (300) is arranged inside the transmitting coil (200), and the receiving coil (300) is connected with a receiver to detect a secondary field decay signal; The gondola body (100) comprises a first fixing ring (110), a rope assembly (120) and a crossbeam (130), wherein the first fixing ring (110) is connected with the aircraft through the rope assembly (120), the crossbeam (130) passes through the center of the first fixing ring (110), the two ends of the crossbeam (130) are fixedly connected with the first fixing ring (110), the receiving coil (300) is fixedly connected with the crossbeam (130), the transmitting coil (200) is arranged in the first fixing ring (110), the first fixing ring (110) comprises a bending part (150) which is curled to form a closed ring, the two ends of the bending part (150) are locked and released through a positioning member (170), the bending part (150) passes through the positioning member (170) and extends to form a free end (160), when the positioning member (170) releases the bending part (150), the bending degree of the bending part (150) and the length of the free end (160) are adjustable to change the radial size of the closed ring.

2. The full-airborne transient electromagnetic surveying nacelle according to claim 1, characterized in that, The closed ring is a circular ring with a diameter ranging from 3 to 15 meters.

3. The full-airborne transient electromagnetic surveying bird of claim 2, wherein, The first fixing ring (110) comprises a plurality of bending parts (150), and the plurality of bending parts (150) are curled to form a closed ring, and the two ends of each bending part (150) are locked and released through the positioning member (170).

4. The full-airborne transient electromagnetic surveying bird of claim 3, wherein, The gondola body (100) comprises a second fixing ring (140), the second fixing ring (140) is arranged between the first fixing ring (110) and the receiving coil (300), and the second fixing ring (140) is fixedly connected with the crossbeam (130); the full-airborne transient electromagnetic detection gondola comprises a compensation coil (400), the compensation coil (400) is arranged in the second fixing ring (140), and the compensation coil (400) is electrically connected with the transmitting coil (200) and has an opposite current direction.

5. The full-airborne transient electromagnetic surveying bird of claim 4, wherein, The second fixing ring (140) comprises a bending part (150) which is curled to form a closed ring, the two ends of the bending part (150) are locked and released through a positioning member (170), and the bending part (150) passes through the positioning member (170) and extends to form a free end (160).

6. The full-airborne transient electromagnetic surveying bird of claim 5, wherein, The second fixing ring (140) comprises a plurality of bending parts (150), and the plurality of bending parts (150) are curled to form a closed ring, and the two ends of each bending part (150) are locked and released through the positioning member (170).

7. The full-airborne transient electromagnetic surveying bird of claim 6, wherein, The rope assembly (120) comprises a first central hub (121), a second central hub (122), a central rope (123), a horizontal pull rope (124) and a diagonal pull rope (125), wherein, The first central hub (121) is coaxially arranged with the first fixed ring (110); the second central hub (122) is arranged between the first central hub (121) and the aircraft; the central rope (123) vertically passes through the second central hub (122) to connect the aircraft and the first central hub (121); the horizontal pull rope (124) is used to connect the first central hub (121) and the first fixed ring (110), and the diagonal pull rope (125) is used to connect the second central hub (122) and the first fixed ring (110).

8. The full-airborne transient electromagnetic surveying bird of claim 7, wherein, The number of the horizontal pull rope (124) and the diagonal pull rope (125) is multiple, the multiple horizontal pull ropes (124) are uniformly distributed with the first central hub (121) as the center, and the multiple diagonal pull ropes (125) are uniformly distributed with the second central hub (122) as the center.

9. The full-airborne transient electromagnetic surveying bird of claim 1, wherein, The positioning member (170) comprises a first connecting block (171) and a first locking screw (172), the number of the first connecting block (171) is two, when the two first connecting blocks (171) are connected through the first locking screw (172), the two first connecting blocks (171) form a gap for passing through two ends of the curved portion (150) and the launch coil (200).

10. The full-airborne transient electromagnetic surveying bird of claim 1, wherein, The pod body (100) is a non-metal material.

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