Infrared imaging type nonlinear node detector

Abstract

The invention relates to the technical field of non-linear node detectors, and particularly discloses an infrared imaging type non-linear node detector, which comprises a tripod, two turnover rods, a turnover disc and a first worm gear, and is characterized in that the two turnover rods are rotatably arranged at the top ends of the front and rear sides of the tripod through bearings respectively; the overturning rod located on the front side rotatably extends out of the front side of the tripod, the middles of the front side and the rear side of the overturning disc are arranged at the inner ends of the two overturning rods respectively, and the first worm gear is connected to the outer wall of the overturning rod located on the front side in a sleeving mode and locked through a jackscrew. The device not only realizes sensitive detection of hidden electronic equipment, but also solves the fundamental defect that target depth information cannot be obtained in the prior art, is simple in structure, intuitive in operation and accurate in positioning, remarkably improves the searching efficiency and positioning reliability in practical applications such as security check and anti-theft, and is suitable for popularization and application. And the method is an important improvement on the functions of the existing nonlinear node detector.

Description

Technical Field

[0001] This invention relates to the field of nonlinear node detector technology, specifically to an infrared imaging nonlinear node detector. Background Technology

[0002] Nonlinear node detectors, as an important electronic reconnaissance device, are widely used in security inspections, counter-espionage, examination room supervision, and investigation of confidential locations. Their basic principle is to transmit radio frequency signals of a specific frequency to the target area and receive harmonic responses generated by nonlinear nodes in the environment (such as semiconductor junctions, metal contact points, etc.) to detect hidden electronic devices. Traditional nonlinear node detectors can effectively identify whether electronic devices exist in the target area and report potential targets to operators through audible and visual cues or simple location signal strength changes. However, with the continuous evolution of concealment technology, the installation methods of illegal electronic devices (such as miniature eavesdropping devices, pinhole cameras, and undeclared communication terminals) are becoming increasingly covert. They are often embedded inside walls, buried in decorative layers, or even encapsulated in furniture structures. Based solely on the detection results of traditional nonlinear node detectors, operators often find it difficult to quickly and accurately determine the exact location of the target in three-dimensional physical space. In recent years, in order to improve the intuitiveness of detection results, some existing technologies have attempted to combine infrared thermal imaging technology with nonlinear node detection. That is, after detecting the target, an enhanced radio frequency signal is emitted to cause an instantaneous temperature rise in the semiconductor junction of the target device. Then, an infrared thermal imager is used to capture this temperature change and present it on the display as a hot spot. Although this method achieves visualization of the detection results and can assist operators in identifying the thermal characteristics of the device to a certain extent, it is still essentially still at the level of two-dimensional image display. Existing infrared-assisted detection solutions still have the following significant shortcomings: First, thermal imaging images are only two-dimensional planar images. Although they can show the presence of heat spots, they cannot provide information on the target's location in the depth direction. For example, when a heat spot appears on a wall, the operator cannot determine whether the device is attached to the wallpaper surface, buried in the shallow layer of the wall, or located deep inside the wall. Second, due to the lack of perception of spatial depth and structure, such devices can only indicate "where electronic equipment exists," but cannot further indicate the straight-line distance, burial depth, or spatial relative position between the device and the detection point. This forces operators to rely on experience, manual investigation, or other tools during subsequent searches, consuming a lot of time and manpower, resulting in low efficiency. Third, in complex environments, such as inside multi-layered walls, ceilings, or floor layers, two-dimensional thermal imaging has difficulty distinguishing which structural layer the device is located in, easily leading to misjudgment or missed detection, affecting the accuracy and reliability of the investigation. Summary of the Invention

[0003] The purpose of this invention is to provide an infrared imaging nonlinear node detector to solve the problem that existing nonlinear node detectors cannot obtain the depth information of the target after detecting it, making it difficult to accurately locate hidden electronic devices in three-dimensional space, resulting in low search efficiency.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an infrared imaging nonlinear node detector, comprising: a tripod, a flip rod, a flip disk, a first worm gear, a first worm, a nonlinear node detector, a movable slot, a positioning mechanism, a first infrared thermal imager, and a first display. The flip rod has two components, which are rotatably mounted on the front and rear top ends of the tripod via bearings. The front flip rod extends rotatably beyond the front of the tripod. The middle portions of the front and rear sides of the flip disk are respectively disposed at the inner ends of the two flip rods. The first worm gear is sleeved on the positioning mechanism. The first worm gear is rotatably mounted on the top front side of the tripod via a bearing and is locked in place by a set screw on the outer wall of the front flipping rod. The first worm gear meshes with the first worm wheel. The nonlinear node detector is detachably mounted on the top of the flipping disk. The front right end of the nonlinear node detector has a through-hole movable slot. The positioning mechanism is located in the inner cavity of the movable slot. The first infrared thermal imager is located on the top rear side of the nonlinear node detector. The first display is located on the top front side of the nonlinear node detector. The first display and the first infrared thermal imager are electrically connected.

[0005] Preferably, the positioning mechanism includes: a rotating rod, a second infrared thermal imager, a second worm gear, a second worm, and a second display. There are two rotating rods, each rotatably mounted on the upper and lower right ends of the inner cavity of the movable groove via bearings. The outer ends of the two rotating rods rotatably extend outwards from the outer side of the movable groove. The upper and lower sides of the second infrared thermal imager are respectively located at the inner ends of the two rotating rods. The second display is located at the front right end of the nonlinear node detector. The second display and the second infrared thermal imager are electrically connected. The second worm gear is sleeved on the outer wall of the lower rotating rod and locked by a set screw. The second worm is rotatably mounted below the nonlinear node detector via bearings, and the second worm and the second worm gear mesh with each other.

[0006] Preferably, the second infrared thermal imager and the first infrared thermal imager are on the same horizontal line and parallel to each other, and the distance between the second infrared thermal imager and the first infrared thermal imager is known and fixed.

[0007] Preferably, the positioning mechanism further includes a scale and a first pointer, the scale being fixedly sleeved on the outer wall of the rotating rod located above, and the first pointer being located on the top right side of the nonlinear node detector, the first pointer matching the scale.

[0008] Preferably, the positioning mechanism further includes: a connecting rod, pulleys, a belt, a protective cover, a viewing window, and a second pointer. The connecting rod is rotatably mounted on the top right side of the nonlinear node detector via a bearing. There are two pulleys, which are respectively sleeved on the top of the outer wall of the connecting rod and the rotating rod located above, and locked. The two ends of the belt are respectively sleeved on the outer walls of the two pulleys. The protective cover is located on the top right side of the nonlinear node detector. A portion of the belt is slidably embedded in the inner cavity of the protective cover. A viewing window communicating with the inner cavity is opened on the front side of the top of the protective cover. The second pointer is located on the front side of the inner cavity of the viewing window, and the second pointer matches the belt.

[0009] Preferably, the position of the viewing window corresponds to the position of the belt, and the top of the belt is provided with scale lines.

[0010] Preferably, the second infrared thermal imager is rotated by rotating the second worm gear to drive the second worm wheel and rotating rod, until the target hot spot is at the center of its optical axis, so that the optical axes of the second infrared thermal imager and the first infrared thermal imager intersect at the target point.

[0011] Preferably, based on the fixed distance between the second infrared thermal imager and the first infrared thermal imager, the target distance corresponding to different rotation angles is converted into scale marks on the belt through preliminary testing. With the help of the scale marks on the belt and the second pointer, the straight-line distance between the first infrared thermal imager and the target can be read directly.

[0012] Preferably, the rear left end of the nonlinear node detector is disposed on a measuring tape.

[0013] Preferably, the straight-line distance between the first infrared thermal imager and the wall reference is measured using the measuring tape on the left side of the nonlinear node detector. Combined with the straight-line distance between the detector and the target measured by the second and first infrared thermal imagers, the specific position of the target in three-dimensional space is calculated through spatial geometric relationships.

[0014] The infrared imaging nonlinear node detector proposed in this invention has the following advantages: 1. The present invention first uses a handheld nonlinear node detector to scan the target area. The nonlinear node detection module inside the detector emits electromagnetic waves of a specific frequency and identifies hidden electronic devices by receiving harmonic signals. Once a target is detected, the detector immediately emits a stronger radio frequency excitation signal to the device, causing a slight but rapid temperature rise in its semiconductor junction. This step can quickly and sensitively detect hidden electronic devices, effectively avoiding the limitations of traditional methods that rely solely on signal strength for judgment, and significantly improving the accuracy of detection.

[0015] 2. After the target is confirmed, the present invention mounts the detector on a tripod and adjusts the first worm gear. The pitch angle of the detector is smoothly adjusted through the worm gear mechanism to align with the target. This design not only provides a stable operating platform, but also enables fine adjustment of the detector height, ensuring the center alignment of the subsequent infrared thermal imaging. It solves the drawbacks of handheld devices being prone to shaking and unstable imaging, and creates the necessary conditions for subsequent accurate ranging.

[0016] 3. The present invention uses a first infrared thermal imager to capture temperature changes caused by radio frequency excitation in real time and display them as clear hot spots on a first display. The operator can adjust the detector position accordingly to make the hot spot accurately located at the center of the optical axis of the first infrared thermal imager. This step intuitively combines nonlinear detection with infrared thermal imaging, making the detection results visible and enabling the operator to quickly identify the specific location of the heating element, thus realizing the transformation from detection to seeing.

[0017] 4. This invention rotates the second worm gear, causing the second infrared thermal imager to rotate around the rotating rod until the target hot spot is also located at the center of its optical axis. At this time, the optical axes of the two infrared thermal imagers intersect at the target. This design establishes a precise ranging geometry through the dual thermal imager structure, laying the physical foundation for the determination of the target distance and avoiding the inherent defect that single-point detection cannot obtain depth information.

[0018] 5. When both thermal imagers are aligned with the target, the rotation of the second infrared thermal imager drives the dial and belt to rotate. The rotation angle of the second infrared thermal imager can be read by the cooperation between the dial and the first pointer. The target distance can be directly read by the correspondence between the scale lines on the belt and the second pointer. This mechanical ranging method is simple and reliable, does not rely on complex electronic calculations, improves the stability and real-time performance of the system, and realizes rapid and intuitive measurement of the straight-line distance of the target.

[0019] 6. This invention uses a measuring tape set on the left side of the device to measure the straight-line distance between the detector and reference objects such as walls. Combined with the acquired target distance information, the specific location of the target in three-dimensional space can be calculated. This method places the distance measurement results in the actual physical environment for spatial positioning, which significantly improves the efficiency and accuracy of the search. It is especially suitable for locating equipment hidden in complex structures such as walls and mezzanines.

[0020] 7. This device not only achieves sensitive detection of concealed electronic devices, but also further solves the fundamental defect of traditional technologies that cannot obtain target depth information. Its simple structure, intuitive operation, and accurate positioning significantly improve the search efficiency and positioning reliability in practical applications such as security inspection and anti-espionage. It is an important improvement and enhancement to the function of existing nonlinear node detectors. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 This is a schematic diagram of the structure of a nonlinear node detector; Figure 4 This is a top view of a nonlinear node detector; Figure 5 This is an exploded view of a nonlinear node detector. Figure 6 for Figure 4 Enlarged view of point A; Figure 7 for Figure 3 Enlarged view of point B; Figure 8 for Figure 5 Enlarged view of point C; Figure 9 for Figure 2 Enlarged view of point D.

[0022] In the diagram: 1. Tripod; 2. Flip rod; 3. Flip disc; 4. First worm gear; 5. First worm; 6. Nonlinear node detector; 7. Movable slot; 8. Positioning mechanism; 81. Rotating rod; 82. Second infrared thermal imager; 83. Second worm gear; 84. Second worm; 85. Dial; 86. First pointer; 87. Connecting rod; 88. Pulley; 89. Belt; 810. Protective cover; 811. Viewing window; 812. Second pointer; 813. Second display; 9. First infrared thermal imager; 10. First display; 11. Measuring tape. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1-9This invention provides a technical solution for an infrared imaging nonlinear node detector, comprising: a tripod 1, a flipping rod 2, a flipping disk 3, a first worm gear 4, a first worm 5, a nonlinear node detector 6, a movable slot 7, a positioning mechanism 8, a first infrared thermal imager 9, a first display 10, and a measuring tape 11. The tripod 1 is existing technology and will not be described in detail here. The tripod 1 serves as a stable support platform for the entire detection system; its triangular structure design ensures the device remains stable under various ground conditions, providing a foundation for precision detection and measurement. There are two flipping rods 2, which are rotatably mounted on the front and rear top ends of the tripod 1 via bearings. The front flipping rod 2 extends rotatably outward from the front of the tripod 1. The rotating disk 3 is positioned at the inner ends of two rotating rods 2 on its front and rear sides. The rotating disk 3 supports the nonlinear node detector 6, forming the core support component for pitch adjustment, enabling flexible adjustment of the detector's overall angle. A first worm gear 4 is sleeved on the outer wall of the rotating rod 2 located on the front side and locked with a set screw. The first worm gear 4 meshes with the first worm 5 to form a worm gear transmission pair, possessing self-locking characteristics, allowing for high-precision and stable adjustment of the rotating disk 3's angle. The first worm 5 is rotatably mounted on the top front side of the tripod 1 via a bearing. The first worm 5 meshes with the first worm gear 4. Manually rotating the first worm 5 drives the first worm gear 4 to rotate, thereby controlling the pitch angle of the rotating disk and the detector. The operation is simple and the adjustment is precise. The linear node detector 6 is detachably mounted on the top of the flip disk 3. The nonlinear node detector 6 has a through-hole swivel slot 7 on its front right side. The nonlinear node detector 6 is existing technology and will not be described in detail here. It is the core detection module of this device, capable of emitting and receiving electromagnetic waves of specific frequencies to identify nonlinear nodes in the environment, enabling preliminary detection of hidden electronic devices. It can also emit radio frequency excitation signals to heat up the device. The positioning mechanism 8 is located within the cavity of the swivel slot 7 and is integrated within it. It controls the rotation of the second infrared thermal imager 82 and reads its angle to acquire target depth information. The first infrared thermal imager 9 is located on the rear top of the nonlinear node detector 6. The first infrared thermal imager 9 is existing technology and will not be described in detail here. The first infrared thermal imager 9 is used to capture infrared images of the heated area of ​​the target device caused by radio frequency excitation, providing operators with visual information about the target. The first display 10 is located on the top front side of the nonlinear node detector 6. The first display 10 and the first infrared thermal imager 9 are electrically connected. The first display 10 is existing technology and will not be described in detail here. The first display 10 and the first infrared thermal imager 9 are electrically connected to display the thermal imaging image in real time, facilitating operators to observe the location of the target hot spot and perform preliminary positioning. The measuring tape 11 is located on the rear left side of the nonlinear node detector 6. The measuring tape 11 is equipped with a locking mechanism. The measuring tape 11 is existing technology and will not be described in detail here.Measuring tape 11 is used to manually measure the straight-line distance between the nonlinear node detector 6 and reference objects such as walls, assisting in the target positioning calculation in three-dimensional space.

[0025] As a preferred embodiment, the positioning mechanism 8 further includes: a rotating rod 81, a second infrared thermal imager 82, a second worm gear 83, a second worm 84, a dial 85, a first pointer 86, a connecting rod 87, a pulley 88, a belt 89, a protective cover 810, a viewing window 811, a second pointer 812, and a second display 813. There are two rotating rods 81, which are rotatably mounted on the upper and lower right ends of the inner cavity of the movable groove 7 via bearings. The outer ends of the two rotating rods 81 rotatably extend outwards from the outer side of the movable groove 7. The rotating rods 81 serve as the rotational support shafts of the second infrared thermal imager 82, allowing the second infrared thermal imager 82 to rotate smoothly around its axis, achieving precise angle adjustment. The upper and lower sides of the second infrared thermal imager 82 are respectively located at the inner ends of the two rotating rods 81. The second infrared thermal imager 82 and the first infrared thermal imager 9 are on the same horizontal line and parallel to each other. The distance between the second infrared thermal imager 82 and the first infrared thermal imager 9 is known and fixed. The second infrared thermal imager 82 is existing technology and will not be described in detail here. The second infrared thermal imager 82 and the first infrared thermal imager 9 constitute the movable end of the dual thermal imager ranging system, used to capture the thermal signal of the same target and realize triangulation ranging. The second display 813 is located at the front right end of the nonlinear node detector 6. The second display 813 and the second infrared thermal imager 82 are electrically connected. The second display 813 is existing technology and will not be described in detail here. The second display 813 can display its captured data in real time. The captured thermal imaging image helps operators confirm the target alignment status. The second worm gear 83 is sleeved on the outer wall of the lower rotating rod 81 and locked by a set screw. The second worm gear 83 can transmit rotational motion from the second worm 84 to the rotating rod 81, realizing precise control of the rotation angle of the second infrared thermal imager 82. The second worm 84 is rotatably set below the nonlinear node detector 6 through a bearing. The second worm 84 and the second worm gear 83 mesh. When the second worm 84 is manually rotated, it can drive the second worm gear 83 to drive the rotating rod 81 to rotate, providing smooth and self-locking angle adjustment and ensuring the stable position of the second infrared thermal imager 82. The scale 85 is fixedly sleeved on the outer wall of the upper rotating rod 81 and is used for direct reading. The rotation angle of the second infrared thermal imager 82 is determined by a first pointer 86 located on the top right side of the nonlinear node detector 6. The first pointer 86 matches a scale 85, and the first pointer 86, in conjunction with the scale 85, enables visual reading of the rotation angle, providing an angle measurement method. A connecting rod 87 is rotatably mounted on the top right side of the nonlinear node detector 6 via bearings. Two pulleys 88 are provided, each sleeved on the connecting rod 87 and the top of the upper rotating rod 81, and locked in place. A belt 89 is sleeved on the outer walls of the two pulleys 88 at both ends, and a scale line is provided at the top of the belt 89. When the rotating rod 81 rotates, the belt 89 moves accordingly. The measurement is determined by the correspondence between the scale line and the second pointer 812.To provide an alternative angle-distance conversion reading method, a protective cover 810 is positioned on the top right side of the nonlinear node detector 6. A portion of the belt 89 is slidably embedded within the inner cavity of the protective cover 810. A viewing window 811, communicating with the inner cavity, is located on the front side of the top of the protective cover 810. The position of the viewing window 811 corresponds to the position of the belt 89. A second pointer 812 is positioned on the front side of the inner cavity of the viewing window 811, matching the belt 89. The second pointer 812 can indirectly read the target distance by cooperating with the scale of the belt 89.

[0026] Its detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and the specific work is as follows.

[0027] Step 1: When using the device, the operator first removes the nonlinear node detector 6 from the tripod 1. Then, the operator holds the nonlinear node detector 6 and scans the target area. The nonlinear node detection module inside the nonlinear node detector 6 starts working. By emitting and receiving electromagnetic waves of a specific frequency, it detects whether there are nonlinear nodes in the surrounding environment. Once the nonlinear node detector 6 confirms the presence of a hidden electronic device, it will alert the operator and immediately emit a stronger radio frequency excitation signal to the device. This strong signal acts on the semiconductor junction of the hidden device, causing it to heat up slightly but rapidly. Step 2: After the nonlinear node detector 6 detects the hidden electronic device and alerts the operator, remount the nonlinear node detector 6 on the tripod 1 and place the tripod 1 stably on the ground. If the detected hidden electronic device is too low, rotate the first worm gear 5. This will drive the first worm wheel 4 to rotate the rotating disk 3 via the rotating rod 2. The rotating disk 3 will then rotate the nonlinear node detector 6, allowing adjustment of its height. Activate the first infrared thermal imager 9 to capture the minute temperature changes of the hidden electronic device caused by radio frequency excitation in real time. On the first display 10, the heated electronic component will appear as a clear hot spot, contrasting sharply with the surrounding environment. By observing the first display 10, the operator can visually see the location of the target device. Afterward, the operator needs to adjust the position of the nonlinear node detector 6 to ensure that the hot spot of the heated electronic component is precisely centered on its optical axis. This step is crucial for subsequent ranging work, as it directly affects the accuracy of the measurement. Step 3: By rotating the second worm gear 84, the operator can drive the second worm wheel 83 to rotate the lower rotating rod 81. This lower rotating rod 81 then drives the second infrared thermal imager 82, mounted on the right side of the nonlinear node detector 6, to rotate. When the second infrared thermal imager 82 rotates, it drives the upper rotating rod 81, causing the scale 85 and pulley 88 to rotate, which in turn moves the belt 89. The rotation of the scale 85 coordinates with the first pointer 86, allowing real-time reading of the thermal imager's rotation angle. The operator rotates the second infrared thermal imager 82 until it can also capture the hot spot of the heating electronic component and adjusts it so that the hot spot is at the center of its optical axis. At this point, the hot spot of the heating electronic component is simultaneously located at the intersection of the optical axes of the two infrared thermal imagers. This provides precise conditions for subsequent ranging work. Since the distance between the first infrared thermal imager 9 and the second infrared thermal imager 82 is fixed and known, through the preliminary testing of this device, the distance from the first infrared thermal imager 9 to the intersection of the optical axes of the first infrared thermal imager 9 and the second infrared thermal imager 82 at different rotation angles of the second infrared thermal imager 82 can be detected by triangulation. Based on the detection results, the scale line is marked on the top of the belt 89 in advance. Thus, when the hot spot of the heating electronic component is located at the intersection of the optical axes of the first infrared thermal imager 9 and the second infrared thermal imager 82, the straight-line distance between the first infrared thermal imager 9 and the heating electronic component can be read by the cooperation between the scale line at the top of the belt 89 and the second pointer 812. Step 4: Finally, the operator uses the measuring tape 11 set on the left side of the nonlinear node detector 6 to measure the straight-line distance between the first infrared thermal imager 9 and reference objects such as the wall. Combined with the previously read straight-line distance between the first infrared thermal imager 9 and the heating electronic component, the specific location of the heating electronic component in three-dimensional space can be accurately determined, which is convenient for locating.

[0028] In summary, this device not only achieves sensitive detection of concealed electronic devices, but also further solves the fundamental defect of traditional technologies in being unable to obtain target depth information. Its simple structure, intuitive operation, and accurate positioning significantly improve the search efficiency and positioning reliability in practical applications such as security inspection and anti-espionage. It is an important improvement and enhancement to the functions of existing nonlinear node detectors.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An infrared imaging nonlinear nodal detector, characterized in that, include: Tripod (1); The number of flip rods (2) is two. The two flip rods (2) are rotatably set on the front and rear top sides of the tripod (1) respectively through bearings. The flip rod (2) located on the front side can rotatably extend out of the front side of the tripod (1). The flip plate (3) is located at the inner ends of the two flip rods (2) on the front and rear sides of the flip plate (3). The first worm gear (4) is sleeved on the outer wall of the flip rod (2) located on the front side and locked by the set screw; The first worm (5) is rotatably mounted on the top front side of the tripod (1) via a bearing, and the first worm (5) meshes with the first worm wheel (4); Nonlinear node detector (6), which is detachably mounted on the top of the flip disk (3), has a through-hole (7) on the right front side of the nonlinear node detector (6). Positioning mechanism (8), wherein the positioning mechanism (8) is disposed in the inner cavity of the movable groove (7); The first infrared thermal imager (9) is located on the top rear side of the nonlinear node detector (6); The first display (10) is disposed on the top front side of the nonlinear node detector (6), and the first display (10) is electrically connected to the first infrared thermal imager (9).

2. The infrared imaging nonlinear node detector according to claim 1, characterized in that, The positioning mechanism (8) includes: Rotating rod (81), there are two rotating rods (81), the two rotating rods (81) are rotatably set on the upper and lower right ends of the inner cavity of the movable groove (7) respectively through bearings, and the outer ends of the two rotating rods (81) respectively extend rotatably out of the outer side of the movable groove (7); The second infrared thermal imager (82) is located on the upper and lower sides of the two rotating rods (81) respectively. The second display (813) is disposed on the front right end of the nonlinear node detector (6), and the second display (813) is electrically connected to the second infrared thermal imager (82). The second worm gear (83) is sleeved on the outer wall of the rotating rod (81) located below and locked by a set screw; The second worm (84) is rotatably mounted below the nonlinear node detector (6) via a bearing, and the second worm (84) meshes with the second worm wheel (83).

3. The infrared imaging nonlinear node detector according to claim 2, characterized in that, The second infrared thermal imager (82) and the first infrared thermal imager (9) are on the same horizontal line and are parallel to each other. The distance between the second infrared thermal imager (82) and the first infrared thermal imager (9) is known and fixed.

4. The infrared imaging nonlinear node detector according to claim 3, characterized in that, The positioning mechanism (8) further includes: A dial (85) is fixedly sleeved on the outer wall of the rotating rod (81) located above; The first pointer (86) is located on the top right side of the nonlinear node detector (6), and the first pointer (86) matches the dial (85).

5. The infrared imaging nonlinear node detector according to claim 4, characterized in that, The positioning mechanism (8) further includes: A connecting rod (87) is rotatably mounted on the top right side of the nonlinear node detector (6) via a bearing; Two pulleys (88) are provided, and the two pulleys (88) are respectively sleeved on the top of the outer wall of the connecting rod (87) and the rotating rod (81) located above, and locked. A belt (89), the two ends of which are respectively sleeved on the outer walls of two pulleys (88); A protective cover (810) is provided on the top right side of the nonlinear node detector (6). A portion of the belt (89) is slidably embedded in the inner cavity of the protective cover (810). A viewing window (811) communicating with the inner cavity is provided on the front side of the top of the protective cover (810). The second pointer (812) is located on the front side of the inner cavity of the window (811), and the second pointer (812) matches the belt (89).

6. The infrared imaging nonlinear node detector according to claim 5, characterized in that, The position of the window (811) corresponds to the position of the belt (89), and the top of the belt (89) is provided with scale lines.

7. An infrared imaging nonlinear node detector according to claim 6, characterized in that, By rotating the second worm (84), the second worm wheel (83) and the rotating rod (81) are driven to rotate the second infrared thermal imager (82) until the target hot spot is at the center of its optical axis, so that the optical axes of the second infrared thermal imager (82) and the first infrared thermal imager (9) intersect at the target point.

8. An infrared imaging nonlinear node detector according to claim 7, characterized in that, Based on the fixed distance between the second infrared thermal imager (82) and the first infrared thermal imager (9), the target distance corresponding to different rotation angles is converted into scale lines marked on the belt (89) through preliminary testing. With the help of the scale lines on the belt (89) and the second pointer (812), the straight-line distance between the first infrared thermal imager (9) and the target is directly read.

9. An infrared imaging nonlinear node detector according to claim 8, characterized in that, The rear left end of the nonlinear node detector (6) is set on the measuring tape (11).

10. An infrared imaging nonlinear node detector according to claim 9, characterized in that, The straight-line distance between the first infrared thermal imager (9) and the wall reference is measured using the measuring tape (11) on the left side of the nonlinear node detector (6). The straight-line distance between the detector and the target is measured by the second infrared thermal imager (82) and the first infrared thermal imager (9) in conjunction with the spatial geometric relationship.

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