Leaky cable device and intrusion detection equipment

Abstract

The utility model relates to a leaky cable device and intrusion detection equipment. The leaky cable device comprises a transmitting cable and a receiving cable. And the length direction of the receiving cable is correspondingly coupled with the length direction of the transmitting cable. And the radial distance between the receiving cable and the transmitting cable is not greater than 0.5 m. The emission holes are distributed at intervals in the length direction. The first shielding layer is correspondingly provided with a transmitting hole between the two adjacent receiving holes along the length direction, and for a midpoint between the two adjacent receiving holes along the length direction, the length of the receiving cable between the midpoint and the transmitting hole is smaller than the length of the receiving cable between the transmitting hole and any one of the two adjacent receiving holes. Even if the radial distance between the receiving cable and the transmitting cable is small, the sufficient distance between the transmitting hole and the receiving hole can still be kept, the situation of close-range coupling of the first wire core and the second wire core is avoided, an electromagnetic field received by the second wire core is kept sensitive to an invasion target, and the detection accuracy is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of leakage cable intrusion detection, in particular to a leakage cable device and an intrusion detection equipment. BACKGROUND

[0002] The intrusion detection equipment based on the leakage cable is an alarm system for detecting perimeter intrusion invisibly, generally comprising a leakage cable and a host. The leakage cable specifically comprises a transmitting cable and a receiving cable, and the transmitting cable and the receiving cable are generally buried underground, and the area where the transmitting cable and the receiving cable are distributed forms a detection area.

[0003] When the intrusion detection equipment is put into use, an electromagnetic field is formed around the transmitting cable and the receiving cable. When an intrusion target moves in the detection area, the electromagnetic field received by the receiving cable is affected. According to the feedback of the receiving cable, the host can recognize abnormal conditions and issue corresponding alarms.

[0004] In the traditional leakage cable, a large interval distance needs to be kept between the transmitting cable and the receiving cable. In the case of insufficient interval distance, because the magnetic field signal is too strong, the transmitting cable and the receiving cable are directly coupled at close range, and the magnetic field signal is not easily disturbed by the intrusion target, so that it is difficult to ensure the accuracy of detection.

[0005] However, in the case of keeping a large interval distance between the transmitting cable and the receiving cable, the installation and construction of the leakage cable are difficult and costly, and the installation environment is limited, and it is difficult to install the leakage cable in the installation environment with insufficient width. CONTENT OF THE INVENTION

[0006] Therefore, the present application provides a leakage cable device and an intrusion detection equipment which can solve or at least alleviate the above technical problems.

[0007] The present application provides a leakage cable device, comprising:

[0008] The transmitting cable comprises a first wire core and a first shielding layer covering the outer periphery of the first wire core; the first shielding layer is provided with a plurality of transmitting holes; the plurality of transmitting holes are distributed at intervals along the length direction; and

[0009] A receiving cable, a length direction of the receiving cable corresponds to a length direction of the transmitting cable, a radial distance between the receiving cable and the transmitting cable is not greater than 0.5m; the receiving cable comprises a second core and a second shielding layer covering an outer periphery of the first core; the second shielding layer is provided with a plurality of receiving holes; the plurality of receiving holes are distributed at intervals along the length direction; the first shielding layer is provided with a transmitting hole corresponding to two adjacent receiving holes along the length direction; for a midpoint between the two adjacent receiving holes along the length direction, a length of the receiving cable between the midpoint and the transmitting hole is less than a length of the receiving cable between the transmitting hole and a receiving hole.

[0010] In use, the leakage cable device of the present application, a detection host inputs a high-frequency alternating signal to the first core. The first core radiates electromagnetic field to the outside space of the first shielding layer through the plurality of transmitting holes. In the electromagnetic field radiated outside the first shielding layer, a part of the electromagnetic field enters the second shielding layer from the plurality of receiving holes respectively, and is received by the second core. When an intrusion target is between the transmitting hole and the receiving hole, the intrusion target disturbs the electromagnetic field, and the detection host judges whether there is an intrusion target according to the electromagnetic field received by the second core. Since the length direction of the receiving cable corresponds to the length direction of the transmitting cable, and the radial distance between the receiving cable and the transmitting cable is not greater than 0.5m, the installation difficulty and cost of the leakage cable device can be reduced, and the installation environment can be avoided to be limited. Since the transmitting hole is arranged between the two adjacent receiving holes along the length direction, and the length of the receiving cable between the midpoint and the transmitting hole is less than the length of the receiving cable between the transmitting hole and the adjacent receiving hole, even if the radial distance between the receiving cable and the transmitting cable is small, as long as the transmitting cable and the receiving cable are not excessively bent, the transmitting hole and the receiving hole can still maintain sufficient distance, the close-coupling situation of the first core and the second core can be avoided, the electromagnetic field received by the second core remains sensitive to the intrusion target, and the detection accuracy is ensured.

[0011] In one of the embodiments, the length of the transmitting cable between the two adjacent transmitting holes along the length direction is 1m-2m; the length of the receiving cable between the two adjacent receiving holes along the length direction is 1m-2m.

[0012] In one of the embodiments, the length of the receiving cable between one transmitting hole and one receiving hole adjacent along the length direction is 0.5m-1m.

[0013] In one of the embodiments, the position of one transmitting hole between the two adjacent receiving holes along the length direction corresponds to a midpoint of the receiving cable between the two adjacent receiving holes; the position of one receiving hole between the two adjacent transmitting holes along the length direction corresponds to a midpoint of the transmitting cable between the two adjacent transmitting holes.

[0014] In one of the embodiments, the outer circumferential side of the first shielding layer is arranged in abutment with the outer circumferential side of the second shielding layer.

[0015] In one of the embodiments, further comprising an outer protective layer; the outer protective layer is arranged around the outer circumferential sides of the transmitting cable and the receiving cable.

[0016] In one of the embodiments, the inner circumferential side of the outer protective layer is arranged in interference fit with the outer circumferential sides of the transmitting cable and the receiving cable.

[0017] The utility model provides a kind of intrusion detection equipment, comprising the leakage cable device of any one of the above embodiments.

[0018] In one of the embodiments, further comprising a detection host and terminal; one end of the transmitting cable is electrically connected to the detection host, and the other end is electrically connected to a terminal; one end of the receiving cable is electrically connected to the detection host, and the other end is electrically connected to another terminal.

[0019] In one of the embodiments, the detection host comprises a transmitting module and a receiving module; the transmitting module is electrically connected to one end of the transmitting cable; the receiving module is electrically connected to one end of the receiving cable. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is structural schematic view of the intrusion detection equipment of one embodiment of the application.

[0021] Figure 2 It is structural schematic view of the leakage cable device of one embodiment of the application.

[0022] Figure 3 It is structural schematic view of the leakage cable device of another embodiment of the application.

[0023] Figure 4 It is cross-sectional schematic view of the leakage cable device of one embodiment of the application.

[0024] Figure 5 It is cross-sectional schematic view of the leakage cable device of another embodiment of the application.

[0025] Reference signs: 100, intrusion detection equipment; 20, detection host; 21, transmitting module; 22, receiving module; 30, terminal; 40, leakage cable device; 50, transmitting cable; 51, first wire core; 52, first shielding layer; 53, transmitting hole; 60, receiving cable; 61, second wire core; 62, second shielding layer; 63, receiving hole; 70, outer protective layer. DETAILED DESCRIPTION

[0026] The technical solutions of the present application will be described clearly and completely in the following description of the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than 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.

[0027] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection, or mechanical connection, or electrical connection, or direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] The technical solutions provided by the embodiments of the present application will be described below in conjunction with the drawings.

[0030] In conjunction with Figure 1 As shown in the drawings, the present application provides an intrusion detection device 100 for implementing perimeter intrusion detection in a detection range. Illustratively, when an intrusion target is detected, the intrusion detection device 100 can send an alarm signal. Illustratively, the intrusion target is a human body or a metal object carried by a human body.

[0031] Specifically, in conjunction with Figure 1As shown, the intrusion detection device 100 comprises a detection host 20, a leaky cable device 40 and a terminal 30. The leaky cable device 40 comprises a transmitting cable 50 and a receiving cable 60. One end of the transmitting cable 50 is electrically connected to the detection host 20, and the other end is electrically connected to one terminal 30. One end of the receiving cable 60 is electrically connected to the detection host 20, and the other end is electrically connected to the other terminal 30. Understandably, under the drive of the detection host 20, the transmitting cable 50 emits electromagnetic field in the detection range. The receiving cable 60 is used to receive the electromagnetic field emitted by the transmitting cable 50. When the intrusion target passes through the detection range, the intrusion target affects the radio frequency energy received by the receiving cable 60 from the electromagnetic field. The detection host 20 internally generates a detection feedback signal according to the change of the radio frequency energy, and the detection feedback signal is sent to the processing unit. Through the analysis of the detection feedback signal, the processing unit identifies the abnormal condition and sends corresponding alarm. The terminal 30 is used to match the impedance of the transmitting cable 50 or the receiving cable 60, to ensure the integrity of the electromagnetic field signal, so as to ensure that the electromagnetic disturbance signal triggered by the intruder to the leaky cable device 40 can be accurately captured, and false negatives caused by reflection are avoided.

[0032] In combination Figure 2 As shown, the present application also provides a leaky cable device 40. The length direction of the receiving cable 60 corresponds to the length direction of the transmitting cable 50. The radial distance between the receiving cable 60 and the transmitting cable 50 is not greater than 0.5m. The transmitting cable 50 comprises a first wire core 51 and a first shielding layer 52 covering the outer periphery of the first wire core 51. The first shielding layer 52 is provided with a plurality of transmitting holes 53. The plurality of transmitting holes 53 are distributed along the length direction at intervals. The receiving cable 60 comprises a second wire core 61 and a second shielding layer 62 covering the outer periphery of the first wire core 51. The second shielding layer 62 is provided with a plurality of receiving holes 63. The plurality of receiving holes 63 are distributed along the length direction at intervals.

[0033] In combination Figure 2 As shown, the first shielding layer 52 is provided with a transmitting hole 53 between two adjacent receiving holes 63 along the length direction. For the midpoint D2 between the two adjacent receiving holes 63 along the length direction, the length L1 of the receiving cable 60 between the midpoint D2 and the transmitting hole 53 is less than the length of the receiving cable 60 between the transmitting hole 53 and any one of the two adjacent receiving holes 63.

[0034] Exemplarily, for the sake of simplifying the description and facilitating understanding, the length L1 of the receiving cable 60 between the midpoint D2 and the transmitting hole 53 is a first length value. For the two adjacent receiving holes 63 along the length direction, the length L2 of the receiving cable 60 between the transmitting hole 53 and one of the receiving holes 63 is a second length value, and the length L3 of the receiving cable 60 between the transmitting hole 53 and the other receiving hole 63 is a third length value. Understandably, the first length value is less than any one of the second length value and the third length value.

[0035] In use, the leakage cable device 40, the detection host 20 inputs a high-frequency alternating signal to the first core 51. The first core 51 radiates electromagnetic field to the outside space of the first shielding layer 52 through the plurality of transmitting holes 53. In the electromagnetic field radiated outside the first shielding layer 52, a part of the electromagnetic field enters the second shielding layer 62 from the plurality of receiving holes 63 respectively, and is received by the second core 61. When the intrusion target is between the transmitting hole 53 and the receiving hole 63, the intrusion target disturbs the electromagnetic field, and the detection host 20 judges whether the intrusion target exists according to the electromagnetic field received by the second core 61. Since the length direction of the receiving cable 60 is coupled and corresponds to the length direction of the transmitting cable 50, and the radial distance between the receiving cable 60 and the transmitting cable 50 is not greater than 0.5m, the installation and construction difficulty and cost of the leakage cable device 40 can be reduced, and the installation environment can be avoided to be limited. Since the transmitting hole 53 is arranged between two adjacent receiving holes 63 along the length direction, and the length L1 of the receiving cable 60 between the midpoint D2 and the transmitting hole 53 is less than the length of the receiving cable 60 between the transmitting hole 53 and the adjacent receiving hole 63, even if the radial distance between the receiving cable 60 and the transmitting cable 50 is small, as long as the transmitting cable 50 and the receiving cable 60 are not excessively bent, the transmitting hole 53 and the receiving hole 63 can still maintain sufficient distance, the first core 51 and the second core 61 are prevented from being close-coupled, the electromagnetic field received by the second core 61 is kept sensitive to the intrusion target, and the detection accuracy is ensured.

[0036] Understandably, since the length direction of the receiving cable 60 is coupled and corresponds to the length direction of the transmitting cable 50, the length direction of the receiving cable 60 is basically consistent with the length direction of the transmitting cable 50. Understandably, the shape between the transmitting cable 50 and the receiving cable 60 at least substantially maintains consistency.

[0037] Understandably, the second shielding layer 62 is provided with a receiving hole 63 between two adjacent transmitting holes 53 along the length direction.

[0038] In some embodiments, in combination with Figure 4 and Figure 5As shown, the outer periphery of the first shielding layer 52 is arranged in abutment with the outer periphery of the second shielding layer 62, so that there is substantially no spacing distance between the transmitting cable 50 and the receiving cable 60, thereby further reducing the installation difficulty and cost of the leaky cable device 40. Understandably, the leaky cable device 40 can be arranged in a single pipe, and the inner diameter of the pipe is not greatly limited. Understandably, since the outer periphery of the first shielding layer 52 is arranged in abutment with the outer periphery of the second shielding layer 62, there is a certain friction force between the first shielding layer 52 and the second shielding layer 62, which helps to inhibit the relative movement of the first shielding layer 52 and the second shielding layer 62 along the length direction, and avoid the change of the relative position of the transmitting hole 53 and the receiving hole 63 along the length direction.

[0039] In some embodiments, in combination with Figure 1 As shown, the detection host 20 comprises a transmitting module 21, which is electrically connected to one end of the transmitting cable 50. Understandably, the transmitting module 21 is electrically connected to one end of the first wire core 51 to output a high-frequency alternating signal to the first wire core 51. The other end of the first wire core 51 is electrically connected to a terminal 30.

[0040] In some embodiments, in combination with Figure 1 As shown, the detection host 20 comprises a receiving module 22, which is electrically connected to one end of the receiving cable 60. Understandably, the receiving module 22 is electrically connected to one end of the second wire core 61. Exemplarily, the receiving module 22 collects a collection signal related to the electromagnetic field state from the receiving cable 60. Optionally, the receiving module 22 also analyzes the amplitude, phase or frequency change of the collection signal, so as to identify the intrusion target in time. The other end of the second wire core 61 is electrically connected to another terminal 30.

[0041] Exemplarily, the transmitting module 21 and the receiving module 22 are respectively electrically connected to a processing unit. The transmitting module 21 operates under the control of the processing unit. The receiving module 22 feeds back a detection feedback signal to the processing unit.

[0042] In some embodiments, in combination with Figure 4 and Figure 5 As shown, the leaky cable device 40 further comprises an outer protective layer 70. The outer protective layer 70 is arranged around the outer periphery of the transmitting cable 50 and the receiving cable 60. Understandably, the outer protective layer 70 can protect the outer surface of the first shielding layer 52 and the outer surface of the second shielding layer 62 from being damaged. Optionally, the outer protective layer 70 has flexibility or elasticity, which is conducive to the adaptation of the leaky cable device 40 to different installation environments.

[0043] As can be understood, the length direction of the receiving cable 60 is coupled to correspond to the length direction of the transmitting cable 50 under the circumferential cladding of the outer sheath 70, and the receiving cable 60 and the transmitting cable 50 can substantially maintain the same shape and length direction.

[0044] In another embodiment, the receiving cable 60 and the transmitting cable 50 can also be circumferentially cladded by a mesh structure or a clamp, so that the length direction of the receiving cable 60 is coupled to correspond to the length direction of the transmitting cable 50.

[0045] Specifically, the electromagnetic field can pass through the outer sheath 70, and the outer sheath 70 does not affect the electromagnetic field. For example, the outer sheath 70 is made of a weather-resistant polymer. For example, the material of the outer sheath 70 is polyethylene, polyvinyl chloride or polyurethane.

[0046] In some embodiments, the inner circumferential side of the outer sheath 70 is in interference fit with the outer circumferential side of the transmitting cable 50 and the receiving cable 60. As can be understood, the outer sheath 70 defines a space along the circumference, and the transmitting cable 50 and the receiving cable 60 are simultaneously accommodated in the space, so that the inner wall surface of the outer sheath 70 is tightly attached to the outer circumferential side of the transmitting cable 50 and the receiving cable 60, and the outer circumferential side of the first shielding layer 52 is in close fit with the outer circumferential side of the second shielding layer 62, thereby inhibiting the relative movement of the first shielding layer 52 and the second shielding layer 62 along the length direction.

[0047] For example, in the free state of the outer sheath 70, the inner diameter of the outer sheath 70 is slightly smaller than the sum of the outer diameters of the transmitting cable 50 and the receiving cable 60, so that the inner circumferential side of the outer sheath 70 is in interference fit with the outer circumferential side of the transmitting cable 50 and the receiving cable 60.

[0048] In some embodiments, in combination with Figure 3 As shown, the length L4 of the transmitting cable 50 between two adjacent transmitting holes 53 along the length direction is 1m-2m, thereby facilitating the control of the number of the transmitting holes 53 of the first shielding layer 52 and ensuring the radiation range of the electromagnetic field. As can be understood, the space distance between the two adjacent transmitting holes 53 is 1m-2m after the transmitting cable 50 is straightened. For example, the several transmitting holes 53 are uniformly and evenly distributed along the length direction, so that the length L4 of the transmitting cable 50 between any two adjacent transmitting holes 53 along the length direction is consistent. Alternatively, the length L4 of the transmitting cable 50 between the two adjacent transmitting holes 53 along the length direction is 1m, 1.2m, 1.5m, 1.8m or 2m.

[0049] In some embodiments, in combination with Figure 3As shown, the length L5 of the receiving cable 60 between two adjacent receiving holes 63 in the length direction is 1 m-2 m, so as to facilitate controlling the number of the receiving holes 63 of the second shielding layer 62 and ensuring the receivable range of the electromagnetic field. Understandably, the space distance between the adjacent two receiving holes 63 is 1 m-2 m after the receiving cable 60 is straightened. Exemplarily, the receiving holes 63 are uniformly distributed in the length direction, so that the length L5 of the receiving cable 60 between any two adjacent receiving holes 63 in the length direction is consistent. Alternatively, the length L5 of the receiving cable 60 between two adjacent receiving holes 63 in the length direction is 1 m, 1.2 m, 1.5 m, 1.8 m or 2 m.

[0050] In some embodiments, in combination with Figure 2 As shown, the length (L2 or L3) of the receiving cable 60 between one adjacent transmitting hole 53 and one adjacent receiving hole 63 in the length direction is 0.5 m-1 m, so as to facilitate controlling the number of the transmitting holes 53 of the first shielding layer 52 and the number of the receiving holes 63 of the second shielding layer 62 and avoiding a large requirement on the output power of the detection host 20. Alternatively, the length (L2 or L3) of the transmitting cable 50 or the receiving cable 60 between one adjacent transmitting hole 53 and one adjacent receiving hole 63 in the length direction is 0.5 m, 0.8 m or 1 m.

[0051] In some embodiments, in combination with Figure 3 As shown, the position of one transmitting hole 53 corresponds to the midpoint D2 of the receiving cable 60 between two adjacent receiving holes 63 in the length direction. The position of one receiving hole 63 corresponds to the midpoint D1 of the transmitting cable 50 between two adjacent transmitting holes 53 in the length direction, so that the minimum length of the transmitting cable 50 or the receiving cable 60 between the adjacent transmitting hole 53 and the receiving hole 63 in the length direction is limited, and the insufficient distance between the individual transmitting hole 53 and the receiving hole 63 is avoided to cause the near-field coupling of the first wire core 51 and the second wire core 61.

[0052] For the midpoint D2 between two adjacent receiving holes 63 in the length direction, the midpoint D2 is oppositely arranged with one transmitting hole 53 in the radial direction. For the midpoint D1 between two adjacent transmitting holes 53 in the length direction, the midpoint D1 is oppositely arranged with one receiving hole 63 in the radial direction, so that the transmitting hole 53 and the receiving hole 63 are formed in a staggered manner, the transmitting hole 53 is avoided to be deviated to one of the adjacent two receiving holes 63, and the minimum length of the transmitting cable or the receiving cable 60 between the transmitting hole 53 and the receiving hole 63 is ensured.

[0053] Exemplarily, the length L4 of the transmitting cable 50 between two length direction adjacent transmitting holes 53 is 1 m. The length L5 of the receiving cable 60 between two length direction adjacent receiving holes 63 is 1 m. In the length direction, there is one transmitting hole 53 between two adjacent receiving holes 63, and the length (L2 or L3) of the transmitting cable 50 or the receiving cable 60 between the transmitting hole 53 and any one of the two receiving holes 63 is 0.5 m.

[0054] The above embodiments only describe the preferred embodiments of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those of ordinary skill in the art shall fall within the protection scope of the claims of the present application.

Claims

1. A leaky cable arrangement, characterized by The application relates to a leakage cable device. The transmission cable comprises a first core and a first shielding layer covering the outer periphery of the first core; the first shielding layer is provided with a plurality of transmission holes; the plurality of transmission holes are distributed along the length direction at intervals; The receiving cable is coupled with the transmission cable in the length direction, and the radial distance between the receiving cable and the transmission cable is not greater than 0.5 m; the receiving cable comprises a second core and a second shielding layer covering the outer periphery of the first core; the second shielding layer is provided with a plurality of receiving holes; the plurality of receiving holes are distributed along the length direction at intervals; the first shielding layer is provided with a transmission hole between two adjacent receiving holes in the length direction; for the midpoint between the two adjacent receiving holes in the length direction, the length of the receiving cable between the midpoint and the transmission hole is smaller than the length of the receiving cable between the transmission hole and the receiving hole. The length of the transmission cable between two adjacent transmission holes in the length direction is 1-2 m; the length of the receiving cable between two adjacent receiving holes in the length direction is 1-2 m.

2. The leaky cable device of claim 1, wherein, The length of the receiving cable between one transmission hole and one receiving hole adjacent in the length direction is 0.5-1 m.

3. The leaky cable device of claim 1, wherein, The position of one transmission hole between two adjacent receiving holes in the length direction corresponds to the midpoint of the receiving cable between the two adjacent receiving holes; the position of one receiving hole between two adjacent transmission holes in the length direction corresponds to the midpoint of the transmission cable between the two adjacent transmission holes.

4. The leaky cable device of claim 1, wherein, The outer periphery of the first shielding layer is arranged in close contact with the outer periphery of the second shielding layer.

5. The leaky cable device of claim 1, wherein, The outer protective layer is arranged around the outer periphery of the transmission cable and the receiving cable.

6. The leaky cable device of claim 1, wherein, The inner periphery of the outer protective layer is arranged in interference fit with the outer periphery of the transmission cable and the receiving cable.

7. The leaky cable device of claim 6, wherein, The application further relates to a leakage cable device comprising the leakage cable device as claimed in any one of claims 1 to 7.

8. An intrusion detection apparatus, characterized by comprising: The application further relates to a leakage cable device comprising a detection host and a terminal; one end of the transmission cable is electrically connected to the detection host, and the other end is electrically connected to one terminal; one end of the receiving cable is electrically connected to the detection host, and the other end is electrically connected to another terminal.

9. The intrusion detection apparatus according to claim 8, wherein The detection host comprises a transmission module and a receiving module; the transmission module is electrically connected to one end of the transmission cable; and the receiving module is electrically connected to one end of the receiving cable.

10. The intrusion detection apparatus according to claim 9, wherein ​

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