Vehicle-mounted pull-type transient electromagnetic road underground hidden danger detection equipment

Abstract

A vehicle-mounted towed transient electromagnetic road underground hidden danger detection device comprises a transmitting coil which is laid on a movable towed platform; the receiving coil is laid on a high platform capable of moving relative to the dragging platform, the high platform is arranged above the dragging platform, and the plane where the receiving coil is located is parallel to the plane where the transmitting coil is located; the host is arranged on the trailer platform, one end of the host is connected with the transmitting coil, the other end of the host is connected with a pre-amplifier, and the end, away from the host, of the pre-amplifier is connected with the receiving coil and used for receiving electromagnetic signals transmitted by the receiving coil. The pitch of turns of the receiving coil is increased, the parasitic capacitance can be reduced, the frequency band is widened, the sensitivity of the receiving system is improved through the pre-amplifier, and the data quality of the urban towed transient electromagnetic device is improved.

Description

Technical Field

[0001] The invention relates to the field of electromagnetic signal acquisition, and in particular to a vehicle-mounted towed transient electromagnetic road underground hidden danger detection equipment. Background Art

[0002] With the increasing demand for urban underground space detection, towed electromagnetic detection technology has attracted widespread attention due to its high efficiency and convenience.

[0003] Towed electromagnetic detection technology is of great significance in the detection of urban underground space. The rapid development of cities has made the use of underground space increasingly important, and accurate detection of the structure and properties of underground space is crucial for urban planning, construction and safety. Towed electromagnetic detection technology can efficiently obtain electromagnetic information of underground space, providing strong support for the development and utilization of underground space.

[0004] In the prior art, the traditional receiving coil is not wide enough, which will lead to the loss of shallow signals, and the amplifier background noise of the towed receiving system is relatively high. Therefore, it is very necessary to propose a vehicle-mounted towed transient electromagnetic road underground hidden danger detection equipment. Summary of the invention

[0005] The purpose of the present invention is to provide a vehicle-mounted towed transient electromagnetic road underground hidden danger detection equipment, so that when using towed electromagnetic detection technology to detect underground space, better quality detection data can be obtained to solve the existing technical defects and unmet technical requirements.

[0006] To achieve the above object, the present invention provides the following technical solution: a vehicle-mounted towed transient electromagnetic road underground hidden danger detection equipment, comprising:

[0007] A transmitting coil, wherein the transmitting coil is laid on a movable towing platform;

[0008] A receiving coil, wherein the receiving coil is laid on a platform that can move relative to the towing platform, the platform is arranged above the towing platform, and the plane where the receiving coil is located is parallel to the plane where the transmitting coil is located;

[0009] The host is arranged on a towing vehicle platform, one end of the host is connected to a transmitting coil, and the other end is connected to a preamplifier, and the end of the preamplifier away from the host is connected to a receiving coil for receiving electromagnetic signals transmitted from the receiving coil.

[0010] Preferably, the receiving coil is configured as an equally spaced cross-coupled honeycomb coil, comprising:

[0011] A skeleton body, wherein the skeleton is in an annular shape as a whole;

[0012] First winding parts, which are spaced apart and circumferentially distributed on the outer ring wall of the skeleton body;

[0013] A second winding portion, the second winding portion is also spaced and circumferentially distributed on the outer ring wall of the skeleton body, and the second winding portion is arranged below the first winding portion;

[0014] The enameled wire has multiple turns which are cross-wound on the first winding part and the second winding part at equal intervals in sequence.

[0015] Preferably, the spacing distance between each adjacent first winding portion is the same, and the spacing distance between each adjacent second winding portion is also the same.

[0016] Preferably, the spacing distance between each adjacent first winding portion is the same as the distance between each adjacent second winding portion.

[0017] In the present application, it is necessary to further explain or illustrate that the above-mentioned content can be understood as the first winding part and the second winding part are aligned one by one in the vertical direction.

[0018] Preferably, there is a first spacing space between each adjacent first winding portion, there is a second spacing space between each adjacent second winding portion, and there is a third spacing space between each pair of first winding portions and second winding portions corresponding to each other in the vertical direction;

[0019] The enameled wire rests on the upper end surface of at least one first winding part, and then passes through the first spacing space, and then obliquely downwards passes through the third spacing space and the second spacing space in sequence, and then rests on the lower end surface of at least one second winding part, and then passes through the second spacing space, and then obliquely upwards passes through the third spacing space and the first spacing space in sequence, and then rests on the upper end surface of at least one first winding part again, so as to be cyclically wound on the skeleton body.

[0020] Each turn of the enameled wire is wound around the skeleton body in the same manner in sequence and at equal intervals.

[0021] In the present application, what needs to be further explained or illustrated is that the inclination in the above statement is, in the horizontal direction, inclined in the direction away from the last winding portion that the enameled wire abuts before the inclination, and as for the spacing space through which it is inclined, in the horizontal direction is naturally not the third spacing space corresponding to the last winding portion that the enameled wire abuts before the inclination, but the third spacing space corresponding to one or more winding portions away from this winding portion. That is, it can be understood that the enameled wire extends in the horizontal direction all the time in the direction away from the initial winding end.

[0022] Preferably, the skeleton body is annular.

[0023] It should be explained in the present application that, except for the amplifier circuit and the coil, the above contents of the present application are conventional settings in the prior art for detection using the towed electromagnetic detection technology, and the more detailed component composition is not specifically discussed.

[0024] Preferably, a hierarchical amplification circuit is used in the preamplifier, and the hierarchical amplification circuit includes a signal receiving and processing circuit, a primary amplification circuit and a secondary amplification circuit. The input end of the signal receiving and processing circuit is connected to the receiving coil, the output end of the signal receiving and processing circuit is connected to the input end of the primary amplification circuit, the output end of the primary amplification circuit is connected to the input end of the secondary amplification circuit, and the output end of the secondary amplification signal circuit is connected to the host.

[0025] Preferably, the signal receiving and processing circuit includes a power supply positive voltage V DD , negative power supply voltage V SS , resistor R1-resistor R6, electromagnetic signal input interface V sig+ And electromagnetic signal input interface V sig- , where the electromagnetic signal input interface V sig+ And electromagnetic signal input interface V sig- are connected to the receiving coils respectively (which is a common technology in the prior art and will not be described in detail here), the positive voltage V DD A resistor R1 and a resistor R2 are connected, the resistor R1 and the resistor R2 are connected in parallel, and in the branch where the resistor R1 is located, the resistor R1 is connected in series with the electromagnetic signal input interface V sig+ and resistor R3, in the branch where the resistor R2 is located, the resistor R2 is connected in series with the electromagnetic signal input interface V sig- The branch where the resistor R1 is located is connected in parallel with the branch where the resistor R1 is located, and then connected in series with the resistor R6. One end of the resistor R6 is connected to the resistor R3 and the resistor R4 set in parallel, and the other end is connected to the negative voltage V SS The resistor R6 is connected in parallel with the resistor R5, one end of the resistor R5 is connected to the resistor R6, and the other end is grounded;

[0026] The preliminary discharge circuit includes an amplifier A1, an amplifier A2, capacitors C1 to C4, resistors R7, R8, R9, and R 10 , resistor R 13 and resistor R14, the capacitor C1 is connected in series with the resistor R7 and connected to the inverting input terminal of the amplifier A1, and the end of the capacitor C1 away from the resistor R7 is connected to the resistor R1 and the electromagnetic signal input interface V sig+ The capacitor C3 and the resistor R8 are connected in parallel and then connected to the in-phase input terminal of the amplifier A1. The end of the capacitor C3 away from the amplifier A1 is grounded. The output terminal of the amplifier A1 is connected in series with the resistor R13 and resistor R 15 The capacitor C3 is connected in series with the resistor R9 and then connected to the inverting input terminal of the amplifier A2. The end of the capacitor C3 away from the resistor R9 is connected to the resistor R2 and the electromagnetic signal input interface V sig- The node between the capacitor C4 and the resistor R 10 After being connected in parallel, the capacitor C4 is connected to the in-phase input terminal of the amplifier A2. The end of the capacitor C4 away from the amplifier A2 is grounded. The output terminal of the amplifier A2 is connected in series with the resistor R 14 and resistor R 16 ;

[0027] The secondary amplification circuit includes an amplifier A3, a resistor R 18 -R 20 , capacitor C5 and electromagnetic signal output interface V out , the inverting input terminal of the amplifier A3 is connected to the resistor R 15 Connect the non-inverting input of the amplifier A3 with the resistor R 16 Connection, i.e. amplifier A 1 and amplifier A 2 After parallel connection, they are connected to amplifier A 3 The inverting input terminal and the non-inverting input terminal of the resistor R18 are connected to the amplifier A3 and the resistor R 16 node between them, with the other end grounded, the amplifier A3 The output end is connected in series with resistor R 19 , resistor R 19 And electromagnetic signal output interface V out , the electromagnetic signal output interface V out Connected to the host, one end of the capacitor C5 is connected to the resistor R 19 And electromagnetic signal output interface V out The node between them and the other end is grounded.

[0028] Preferably, the preliminary amplification circuit also includes a resistor R 11 and R 12 , the resistor R 11 One end is connected to the node between the resistor R7 and the inverting input terminal of the amplifier A1, and the other end is connected to the output terminal of the amplifier A1 and the resistor R 13 The node between the resistor R 12 One end is connected to the node between the resistor R9 and the inverting input terminal of the amplifier A2, and the other end is connected to the output terminal of the amplifier A2 and the resistor R 14 Nodes between;

[0029] The secondary amplifier circuit also includes a resistor R 17 , the resistor R 17One end is connected to the resistor R 15 The other end is connected to the output of amplifier A3 and resistor R 19 The nodes between.

[0030] Since the towed electromagnetic system needs to be placed on a mobile platform for mobile detection, it also has extremely high requirements for the acquisition rate of the host computer acquisition system. It is necessary to ensure the stability of data acquisition and the efficiency of acquisition and storage. Towed electromagnetic data will inevitably need to go through the RAM-ROM process in the host computer, which will be limited by the IO bottleneck. It is necessary to overcome this problem as much as possible through multi-channel host computer program structure optimization to ensure the acquisition and storage efficiency of the host computer. To this end, the writing of superimposed fast acquisition program and production and consumption structure program was carried out.

[0031] The original electromagnetic host computer needs to open the storage file and store the acquired data every time it obtains data from the acquisition card interface. It is difficult to break through the storage efficiency limit of ROM during data storage. Even through fast superposition, the traditional storage structure will still lose some drag-type electromagnetic data due to the mismatch between storage rate and acquisition rate. To solve the problem of acquisition and storage mismatch, a new architecture needs to be used to write the host computer program. For this purpose, the "production-consumption" structure is used to write the LabVIEW multi-channel host computer program. The production-consumption structure is divided into two parts: producers and consumers. The producer is responsible for generating data, which corresponds to the acquisition function in the electromagnetic receiving system. The consumer is responsible for data processing, which can be data storage, data superposition and other preprocessing, or both. During work, the producer obtains data according to hardware instructions and stacks it in the "queue" opened in the memory, waiting for consumers to read and process the data in turn. The producer continuously reads and places data in the queue, overcoming the delay problem caused by the architecture of the traditional host computer. The data acquisition interval is only limited by the hardware bottom-level call program. Consumers are not subject to strict functional restrictions, which improves the scalability of the host computer program.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. This application increases the turn spacing of the receiving coil by setting up equally spaced cross-coupled honeycomb receiving coils, which can reduce parasitic capacitance, widen the frequency band, make the resonant frequency higher, have a larger bandwidth, effectively improve the bandwidth of multi-turn small loop reception, and improve shallow detection capabilities.

[0034] 2. This application increases the sensitivity of the receiving system through a preamplifier, thereby improving the data quality of the urban towed transient electromagnetic device.

[0035] 3. This application overcomes the delay problem caused by the architecture of the traditional host computer by setting up a LabVIEW multi-channel host computer program with a "production-consumption" structure. The data collection interval is only limited by the hardware bottom-level calling program, so that consumers have no strict functional restrictions, thereby improving the scalability of the host computer program. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the overall structure of the skeleton when the transmitting coil is not wound with enameled wire in Example 1 of the present invention;

[0037] Figure 2 It is a top view of the skeleton when the transmitting coil is not wound with enameled wire in Example 1 of the present invention;

[0038] Figure 3 It is a bottom view of the frame when the transmitting coil is not wound with enameled wire in Example 1 of the present invention;

[0039] Figure 4 This is a plan view of the structure of a honeycomb coil with medium spacing winding according to Embodiment 1 of the present invention;

[0040] Figure 5 is the bandwidth ratio of each receiving coil in Example 1 of the present invention and Comparative Example 1 under the same conditions;

[0041] Figure 6 is a circuit diagram of a preamplifier in the present invention;

[0042] Figure 7 This is a comparison table of the background noise of each amplifier under the same conditions in Example 1 and Comparative Example 2 of the present invention.

[0043] In the figure: skeleton body 1, first winding part 2, second winding part 3, first partition space 4, second partition space 5, third partition space 6, first enameled wire 71, second enameled wire 72, third enameled wire 73, fourth enameled wire 74, fifth enameled wire 75, sixth enameled wire 76, seventh enameled wire 77. DETAILED DESCRIPTION

[0044] The following will be combined with the attached embodiment of the present invention Figure 1-7 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0045] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0046] See also Figure 1-7 , embodiments of the present invention:

[0047] Embodiment 1:

[0048] A vehicle-mounted towed transient electromagnetic road underground hidden danger detection equipment, comprising:

[0049] A transmitting coil, wherein the transmitting coil is laid on a movable towing platform;

[0050] A receiving coil, wherein the receiving coil is laid on a platform that can move relative to the towing platform, the platform is arranged above the towing platform, and the plane where the receiving coil is located is parallel to the plane where the transmitting coil is located;

[0051] The host is arranged on a towing vehicle platform, one end of the host is connected to a transmitting coil, and the other end is connected to a preamplifier, and the end of the preamplifier away from the host is connected to a receiving coil for receiving electromagnetic signals transmitted from the receiving coil.

[0052] like Figure 1-4 As shown: the receiving coil is set as an equally spaced cross-coupled honeycomb coil, including:

[0053] A skeleton body 1, the skeleton is annular in shape as a whole;

[0054] First winding parts 2, which are spaced apart and circumferentially distributed on the outer ring wall of the skeleton body 1;

[0055] The second winding parts 3 are also spaced apart and circumferentially distributed on the outer wall of the skeleton body 1, and the second winding parts 3 are arranged below the first winding part 2;

[0056] The enameled wire is a plurality of turns of enameled wire, which are cross-wound on the first winding part 2 and the second winding part 3 in sequence and at equal intervals.

[0057] like Figure 1-4 As shown in the figure, the spacing distance between each first winding part 2 is the same, and the spacing distance between each second winding part 3 is also the same.

[0058] like Figure 1-4 As shown in FIG. 1 , the spacing distance between each first winding portion 2 is the same as the spacing distance between each second winding portion 3 .

[0059] like Figure 1-4 As shown: there is a first spacing space 4 between each of the first winding parts 2, there is a second spacing space 5 between each of the second winding parts 3, and there is a third spacing space 6 between each pair of first winding parts 2 and second winding parts 3 corresponding to each other in the vertical direction;

[0060] The enameled wire rests on the upper end surfaces of the two first winding parts 2, and then passes through the first spacing space 4, and then obliquely downwards passes through the third spacing space 6 and the second spacing space 5 in sequence, and then rests on the lower end surfaces of the two second winding parts 3, and then passes through the second spacing space 5, and then obliquely upwards passes through the third spacing space 6 and the first spacing space 4 in sequence, and then rests on the upper end surfaces of the two first winding parts 2 again, and is thus cyclically wound on the skeleton body 1.

[0061] Each turn of the enameled wire is wound around the skeleton body 1 in the same manner in sequence and at equal intervals.

[0062] like Figure 4 As shown: In the specific embodiment, 7 turns of enameled wire are specifically arranged, namely the first enameled wire 71, the second enameled wire 72, the third enameled wire 73, the fourth enameled wire 74, the fifth enameled wire 75, the sixth enameled wire 76 and the seventh enameled wire 77. In the present embodiment, the wires are wound from left to right. The first enameled wire 71 first abuts against the upper end surfaces of the two first winding parts 2, and then passes through the first spacing space 4 between the last first winding part 2 abutted by the first enameled wire 71 and the first winding part 2 adjacent to the right side of the first winding part 2, and tilts to the lower right, passes through three adjacent third spacing spaces 6 in sequence, and then passes through the second spacing space 5 adjacent to the right side of the last third spacing space 6, and abuts against the formation of this On the lower end face of the second winding portion 3 on the right side of a second spacing space 5, it continuously abuts against two second winding portions 3, then passes through the second spacing space 5 on the right side of the last second winding portion 3 abutted, tilts to the upper right, passes through three adjacent third spacing spaces 6 in sequence, passes through the first spacing space 4 adjacent to the right side of the last third spacing space 6, and abuts against the upper end face of the first winding portion 2 on the right side forming this first spacing space 4, thereby circulating winding, and the second enameled wire 72, the third enameled wire 73, the fourth enameled wire 74, the fifth enameled wire 75, the sixth enameled wire 76 and the seventh enameled wire 77 are respectively and sequentially wound in the same manner, and the skeleton body 1 is annular.

[0063] Specifically: To further verify the physical properties, the coil in this embodiment is used in the towed battery detection technology, and the results are as follows: Figure 5 shown.

[0064] The preamplifier adopts a hierarchical amplification circuit, which includes a signal receiving and processing circuit, a primary amplification circuit and a secondary amplification circuit. The input end of the signal receiving and processing circuit is connected to the receiving coil, the output end of the signal receiving and processing circuit is connected to the input end of the primary amplification circuit, the output end of the primary amplification circuit is connected to the input end of the secondary amplification circuit, and the output end of the secondary amplification signal circuit is connected to the host.

[0065] like Figure 6 As shown: the signal receiving and processing circuit includes a positive power supply voltage V DD , negative power supply voltage V SS , resistor R1-resistor R6, electromagnetic signal input interface V sig+ And electromagnetic signal input interface V sig- , the power supply positive voltage V DD A resistor R1 and a resistor R2 are connected, the resistor R1 and the resistor R2 are connected in parallel, and in the branch where the resistor R1 is located, the resistor R1 is connected in series with the electromagnetic signal input interface V sig+ and resistor R3, in the branch where the resistor R2 is located, the resistor R2 is connected in series with the electromagnetic signal input interface V sig- The branch where the resistor R1 is located is connected in parallel with the branch where the resistor R1 is located, and then connected in series with the resistor R6. One end of the resistor R6 is connected to the resistor R3 and the resistor R4 set in parallel, and the other end is connected to the negative voltage V SS The resistor R6 is connected in parallel with the resistor R5, one end of the resistor R5 is connected to the resistor R6, and the other end is grounded;

[0066] The preliminary discharge circuit includes an amplifier A1, an amplifier A2, capacitors C1 to C4, resistors R7, R8, R9, and R 10 , resistor R 13 and resistor R14, the capacitor C1 is connected in series with the resistor R7 and connected to the inverting input terminal of the amplifier A1, and the end of the capacitor C1 away from the resistor R7 is connected to the resistor R1 and the electromagnetic signal input interface V sig+ The capacitor C3 and the resistor R8 are connected in parallel and then connected to the in-phase input terminal of the amplifier A1. The end of the capacitor C3 away from the amplifier A1 is grounded. The output terminal of the amplifier A1 is connected in series with the resistor R 13 and resistor R 15 The capacitor C3 is connected in series with the resistor R9 and then connected to the inverting input terminal of the amplifier A2. The end of the capacitor C3 away from the resistor R9 is connected to the resistor R2 and the electromagnetic signal input interface V sig- The node between the capacitor C4 and the resistor R 10After being connected in parallel, the capacitor C4 is connected to the in-phase input terminal of the amplifier A2. The end of the capacitor C4 away from the amplifier A2 is grounded. The output terminal of the amplifier A2 is connected in series with the resistor R 14 and resistor R 16 ;

[0067] The secondary amplification circuit includes an amplifier A3, a resistor R 18 -R 20 , capacitor C5 and electromagnetic signal output interface V out , the inverting input terminal of the amplifier A3 is connected to the resistor R 15 Connect the non-inverting input of the amplifier A3 with the resistor R 16 Connection, (Amplifier A 1 and amplifier A 2 After parallel connection, they are connected to amplifier A 3 One end of the resistor R18 is connected to the amplifier A3 and the resistor R 16 node between them, with the other end grounded, the amplifier A3 The output end is connected in series with resistor R 19 , resistor R 19 And electromagnetic signal output interface V out , the electromagnetic signal output interface V out Connected to the host, one end of the capacitor C5 is connected to the resistor R 19 And electromagnetic signal output interface V out The node between them and the other end is grounded.

[0068] The preliminary amplification circuit also includes a resistor R 11 and R 12 , the resistor R 11 One end is connected to the node between the resistor R7 and the inverting input terminal of the amplifier A1, and the other end is connected to the output terminal of the amplifier A1 and the resistor R 13 The node between the resistor R 12 One end is connected to the node between the resistor R9 and the inverting input terminal of the amplifier A2, and the other end is connected to the output terminal of the amplifier A2 and the resistor R 14 Nodes between;

[0069] The secondary amplifier circuit also includes a resistor R 17 , the resistor R 17 One end is connected to the resistor R 15 The other end is connected to the output of amplifier A3 and resistor R 19 The nodes between.

[0070] Specifically, in order to further verify the physical characteristics, the background noise of the preamplifier of this embodiment was tested in an electromagnetic shielding room using a dynamic signal analyzer Agilent35670. The results are as follows: Figure 7 As shown in the figure, the vertical axis, The circuit noise, means that the vertical axis means circuit noise, and the unit is volts per square root hertz, and the horizontal axis, Frequency, means that the horizontal axis means frequency, and the unit is Hertz (Hz).

[0071] Comparative Example 1:

[0072] Compared with the implementation, the comparative example adopts the enameled wire of the same wire diameter and is wound according to the coil skeleton of the same size. The same size here refers to the same overall size, not the same structure, that is, the same overall size of the circle. The ordinary circular coil in the prior art is adopted. The results are as follows: Figure 5 shown.

[0073] In summary, the capacitance and inductance of the honeycomb coil are smaller than those of the circular coil with the same number of turns and the same equivalent area. Compared with the circular coil under the same conditions, the honeycomb coil has a higher resonant frequency and a larger bandwidth. Figure 5 As shown, the highest frequency band of the honeycomb coil is 213kHz (i.e., the curve corresponding to 213kHz in the figure is the result of implementation 1, and the other curve is the result of comparative example 1), which can expand the bandwidth of the traditional circular coil by 60%, effectively improving the bandwidth of multi-turn small loop reception, and can improve the shallow detection capability.

[0074] Comparative Example 2:

[0075] This comparative example uses a low-noise integrated amplifier LT1028. The results are as follows Figure 7 shown.

[0076] In summary, the background noise of the preamplifier in Example 1 was tested in an electromagnetic shielding room using a dynamic signal analyzer Agilent 35670, and compared with the original low-noise integrated amplifier LT1028. Under other same conditions, when the amplifiers were different, the background noise comparison between Example 1 and Comparative Example 2 was as follows: Figure 7 As shown, the noise of the preamplifier in Example 1 is lower than that of LT1028 in the transient electromagnetic frequency band, with a minimum of 0.6nV / Hz0.5.

[0077] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0078] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that those skilled in the art can understand.

Claims

1. A vehicle-mounted towed transient electromagnetic road underground hidden danger detection equipment, characterized in that: include: A transmitting coil, wherein the transmitting coil is laid on a movable towing platform; A receiving coil, wherein the receiving coil is laid on a platform that can move relative to the towing platform, the platform is arranged above the towing platform, and the plane where the receiving coil is located is parallel to the plane where the transmitting coil is located; The host is arranged on a towing vehicle platform, one end of the host is connected to a transmitting coil, and the other end is connected to a preamplifier, and the end of the preamplifier away from the host is connected to a receiving coil for receiving electromagnetic signals transmitted from the receiving coil.

2. The vehicle-mounted towed transient electromagnetic road underground hidden danger detection equipment according to claim 1 is characterized in that: The receiving coil is configured as an equally spaced cross-coupled honeycomb coil, comprising: A skeleton body (1), the skeleton being in the shape of a ring as a whole; First winding parts (2), the first winding parts (2) are distributed at intervals and in a circumferential direction on the outer ring wall of the skeleton body (1); A second winding portion (3), the second winding portion (3) is also spaced and circumferentially distributed on the outer ring wall of the skeleton body (1), and the second winding portion (3) is arranged below the first winding portion (2); The enameled wire has multiple turns which are cross-wound on a first winding part (2) and a second winding part (3) at equal intervals in sequence.

3. The vehicle-mounted towed transient electromagnetic road underground hidden danger detection equipment according to claim 2 is characterized in that: The spacing distances between each adjacent first winding portion (2) are the same, and the spacing distances between each adjacent second winding portion (3) are also the same.

4. The vehicle-mounted towed transient electromagnetic road underground hidden danger detection equipment according to claim 1 is characterized in that: The spacing distance between each adjacent first winding portion (2) is the same as the distance between each adjacent second winding portion (3).

5. A vehicle-mounted towed transient electromagnetic road underground hidden danger detection equipment according to claim 2, 3 or 4, characterized in that: There is a first spacing space (4) between each adjacent first winding portion (2), there is a second spacing space (5) between each adjacent second winding portion (3), and there is a third spacing space (6) between each pair of first winding portions (2) and second winding portions (3) corresponding to each other in the vertical direction; The enameled wire abuts against the upper end surface of at least one first winding portion (2), passes through the first spacing space (4), then obliquely downwardly passes through the third spacing space (6) and the second spacing space (5) in sequence, then abuts against the lower end surface of at least one second winding portion (3), then passes through the second spacing space (5), then obliquely upwardly passes through the third spacing space (6) and the first spacing space (4) in sequence, then abuts against the upper end surface of at least one first winding portion (2) again, thereby being cyclically wound on the skeleton body (1).

6. The vehicle-mounted towed transient electromagnetic road underground hidden danger detection equipment according to claim 5 is characterized in that: Each turn of the enameled wire is wound around the skeleton body (1) in the same manner and in a cross manner at equal intervals.

7. The vehicle-mounted towed transient electromagnetic road underground hidden danger detection equipment according to claim 6 is characterized in that: The skeleton body (1) is in the shape of a circular ring.

8. A vehicle-mounted towed transient electromagnetic road underground hidden danger detection equipment according to claim 1, 2, 3, 4, 6 or 7, characterized in that: The preamplifier adopts a hierarchical amplification circuit, which includes a signal receiving and processing circuit, a primary amplification circuit and a secondary amplification circuit. The input end of the signal receiving and processing circuit is connected to the receiving coil, the output end of the signal receiving and processing circuit is connected to the input end of the primary amplification circuit, the output end of the primary amplification circuit is connected to the input end of the secondary amplification circuit, and the output end of the secondary amplification signal circuit is connected to the host.

9. A vehicle-mounted towed transient electromagnetic road underground hidden danger detection equipment according to claim 8, characterized in that: The signal receiving and processing circuit includes a power supply positive voltage V DD , negative power supply voltage V SS , resistor R1-resistor R6, electromagnetic signal input interface V sig+ And electromagnetic signal input interface V sig- , the power supply positive voltage V DD A resistor R1 and a resistor R2 are connected, the resistor R1 and the resistor R2 are connected in parallel, and in the branch where the resistor R1 is located, the resistor R1 is connected in series with the electromagnetic signal input interface V sig+ and resistor R3, in the branch where the resistor R2 is located, the resistor R2 is connected in series with the electromagnetic signal input interface V sig- The branch where the resistor R1 is located is connected in parallel with the branch where the resistor R1 is located, and then connected in series with the resistor R6. One end of the resistor R6 is connected to the resistor R3 and the resistor R4 set in parallel, and the other end is connected to the negative voltage V SS The resistor R6 is connected in parallel with the resistor R5, one end of the resistor R5 is connected to the resistor R6, and the other end is grounded; The preliminary discharge circuit includes an amplifier A1, an amplifier A2, capacitors C1 to C4, resistors R7, R8, R9, and R 10 , resistor R 13 and resistor R 14 The capacitor C1 is connected in series with the resistor R7 and connected to the inverting input terminal of the amplifier A1. The end of the capacitor C1 away from the resistor R7 is connected to the resistor R1 and the electromagnetic signal input interface V sig+ The capacitor C3 and the resistor R8 are connected in parallel and then connected to the in-phase input terminal of the amplifier A1. The end of the capacitor C3 away from the amplifier A1 is grounded. The output terminal of the amplifier A1 is connected in series with the resistor R 13 and resistor R 15 The capacitor C3 is connected in series with the resistor R9 and then connected to the inverting input terminal of the amplifier A2. The end of the capacitor C3 away from the resistor R9 is connected to the resistor R2 and the electromagnetic signal input interface V sig- The node between the capacitor C4 and the resistor R 10 After being connected in parallel, the capacitor C4 is connected to the in-phase input terminal of the amplifier A2. The end of the capacitor C4 away from the amplifier A2 is grounded. The output terminal of the amplifier A2 is connected in series with the resistor R 14 and resistor R 16 ; The secondary amplification circuit includes an amplifier A3, a resistor R 18 -R 20 , capacitor C5 and electromagnetic signal output interface V out , the inverting input terminal of the amplifier A3 is connected to the resistor R 15 Connect the non-inverting input of the amplifier A3 with the resistor R 16 Connect the resistor R 18 One end is connected to amplifier A3 and resistor R 16 node between them, with the other end grounded, the amplifier A3 The output end is connected in series with resistor R 19 , resistor R 19 And electromagnetic signal output interface V out , the electromagnetic signal output interface V out Connected to the host, one end of the capacitor C5 is connected to the resistor R 19 And electromagnetic signal output interface V out The node between them and the other end is grounded.

10. A vehicle-mounted towed transient electromagnetic road underground hidden danger detection equipment according to claim 9, characterized in that: The preliminary amplification circuit also includes a resistor R 11 and R 12 , the resistor R 11 One end is connected to the node between the resistor R7 and the inverting input terminal of the amplifier A1, and the other end is connected to the output terminal of the amplifier A1 and the resistor R 13 The node between the resistor R 12 One end is connected to the node between the resistor R9 and the inverting input terminal of the amplifier A2, and the other end is connected to the output terminal of the amplifier A2 and the resistor R 14 Nodes between; The secondary amplifier circuit also includes a resistor R 17 , the resistor R 17 One end is connected to the resistor R 15 The other end is connected to the output of amplifier A3 and resistor R 19 The nodes between.

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