Nonlinear node judgment method and related equipment

Abstract

The invention relates to a nonlinear node judgment method and related equipment. According to the technical scheme, the nonlinear node judgment method is provided. The nonlinear node judgment method comprises the following steps that harmonic signals radiated by a target object in a detection target area are obtained; and judging whether a nonlinear node exists in the detection target area based on the state change of the harmonic signal. According to the method, the non-linear nodes are distinguished by utilizing the unstable characteristic of the false node structure reflected on the harmonic signals, so that the non-linear nodes are quickly identified, and the whole judgment method is more visual and is simple to operate.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and more specifically, to a method for judging non-linear nodes and related devices. Background Art

[0002] The main purpose of non-linear node detection is to detect electronic devices by detecting non-linear nodes. However, it is found in practical applications that in addition to the non-linear nodes (defined as true nodes) existing in electronic devices, which will radiate corresponding second and third harmonics under the action of the fundamental wave, there is also a type of pure metal item that exhibits this phenomenon, such as keychains, irregular metal parts with extremely small gaps (defined as false nodes), etc. However, this type of pure metal item is not an electronic device and often appears in the scenario of electronic device detection, so the false alarm rate of the non-linear detector is relatively high. Therefore, there is an urgent need to provide a detection method that facilitates operators to identify non-linear nodes. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for judging non-linear nodes and related devices for the above-mentioned partial technical defects of the prior art.

[0004] The technical solution adopted by the present invention to solve its technical problems is to construct a method for judging non-linear nodes, and the method for judging non-linear nodes includes the following steps:

[0005] Obtain the harmonic signals radiated by the target object in the detected target area;

[0006] Determine whether there is a non-linear node in the detected target area based on the state change of the harmonic signals.

[0007] In a specific embodiment of the method for judging non-linear nodes provided by the present invention, the step of determining whether there is a non-linear node in the detected target area based on the state change of the harmonic signals includes:

[0008] Generate a corresponding time-domain curve based on the harmonic signals to determine whether there is a non-linear node in the detected target area based on the time-domain curve.

[0009] In a specific embodiment of the method for judging non-linear nodes provided by the present invention, the harmonic signals include a second harmonic signal and a third harmonic signal corresponding to the fundamental wave signal;

[0010] The step of generating a corresponding time-domain curve based on the harmonic signals to determine whether there is a non-linear node in the detected target area based on the time-domain curve includes:

[0011] When the second harmonic signal and the third harmonic signal are acquired simultaneously, a second-order time-domain curve corresponding to the second harmonic signal and a third-order time-domain curve corresponding to the third harmonic signal are respectively generated, so as to determine whether there is a non-linear node in the detected target area according to the second-order time-domain curve and the third-order time-domain curve.

[0012] In a specific embodiment of the non-linear node determination method of the present invention, the determining whether there is a non-linear node in the detected target area according to the second-order time-domain curve and the third-order time-domain curve includes:

[0013] Obtain the rising segment curves in the second-order time-domain curve and the third-order time-domain curve, and determine whether there is a non-linear node in the detected target area according to the rising segment curves.

[0014] In a specific embodiment of the non-linear node determination method of the present invention, the determining whether there is a non-linear node in the detected target area according to the rising segment curve includes:

[0015] When the slopes of the rising segment curves in the second-order time-domain curve are all greater than zero within a first preset time, the slopes of the rising segment curves in the third-order time-domain curve are all greater than zero within the first preset time, and the amplitude of the rising segment curve of the second-order time-domain curve is greater than the amplitude of the third-order time-domain curve at any moment, it is determined that there is a non-linear node in the detected target area.

[0016] In a specific embodiment of the non-linear node determination method of the present invention, the step of acquiring the harmonic signals radiated by the target in the detected target area includes:

[0017] Acquire a first second harmonic signal and a first third harmonic signal radiated by the target when the detected target area is in a vibrating state;

[0018] The step of, when the second harmonic signal and the third harmonic signal are acquired simultaneously, respectively generating a second-order time-domain curve corresponding to the second harmonic signal and a third-order time-domain curve corresponding to the third harmonic signal, so as to determine whether there is a non-linear node in the detected target area according to the second-order time-domain curve and the third-order time-domain curve includes:

[0019] When the first second harmonic signal and the first third harmonic signal are acquired simultaneously, a first second-order time-domain curve corresponding to the first second harmonic signal and a first third-order time-domain curve corresponding to the first third harmonic signal are respectively generated, so as to determine whether there is a non-linear node in the detected target area based on the first second-order time-domain curve and the first third-order time-domain curve.

[0020] In a specific embodiment of the non - linear node determination method of the present invention, the step of determining whether there is a non - linear node in the detection target area based on the first second - order time - domain curve and the first third - order time - domain curve includes:

[0021] When the difference between the maximum value and the minimum value of the amplitude within the second preset time in the first second - order time - domain curve is less than the first preset value, the difference between the maximum value and the minimum value of the amplitude within the second preset time in the first third - order time - domain curve is less than the second preset value, and the amplitude of the first second - order time - domain curve is greater than the amplitude of the first third - order time - domain curve at any moment, it is determined that there is a non - linear node in the detection target area;

[0022] Otherwise, it is determined that there is no non - linear node in the detection target area.

[0023] In a specific embodiment of the non - linear node determination method of the present invention, the first preset value is less than or equal to 100mv; and / or, the second preset value is less than or equal to 100mv.

[0024] In a specific embodiment of the non - linear node determination method of the present invention, the step of obtaining the harmonic signals radiated by the target in the detection target area includes:

[0025] Obtain the second second - harmonic signal and the second third - harmonic signal radiated by the target in the detection target area when the fundamental signal source shakes;

[0026] When the second - harmonic signal and the third - harmonic signal are obtained simultaneously, the steps of respectively generating the second - order time - domain curve corresponding to the second - harmonic signal and the third - order time - domain curve corresponding to the third - harmonic signal to determine whether there is a non - linear node in the detection target area based on the second - order time - domain curve and the third - order time - domain curve include:

[0027] When the second second - harmonic signal and the second third - harmonic signal are obtained simultaneously, respectively generate the second second - order time - domain curve corresponding to the second second - harmonic signal and the second third - order time - domain curve corresponding to the second third - harmonic signal to determine whether there is a non - linear node in the detection target area based on the second second - order time - domain curve and the second third - order time - domain curve.

[0028] In a specific embodiment of the non - linear node determination method of the present invention, the step of determining whether there is a non - linear node in the detection target area based on the second second - order time - domain curve and the second third - order time - domain curve includes:

[0029] When the difference between the maximum value and the minimum value of the amplitude within the third preset time in the second second-order time-domain curve is less than the third preset value, the difference between the maximum value and the minimum value of the amplitude within the third preset time in the second third-order time-domain curve is less than the fourth preset value, and the amplitude of the second second-order time-domain curve is greater than the amplitude of the second third-order time-domain curve, it is determined that there is a non-linear node in the detected target area;

[0030] Otherwise, it is determined that there is no non-linear node in the detected target area.

[0031] In a specific embodiment of the non-linear node determination method of the present invention, the step of determining whether there is a non-linear node in the detected target area based on the state change of the harmonic signal includes:

[0032] Generating an alarm result based on the harmonic signal, and determining whether there is a non-linear node in the detected target area based on the alarm result.

[0033] In a specific embodiment of the non-linear node determination method of the present invention, the method further includes:

[0034] If the second harmonic signal and the third harmonic signal cannot be obtained simultaneously, it is determined that there is no non-linear node in the detected target area.

[0035] In a specific embodiment of the present invention, a non-linear node determination device is further provided, including a memory and a processor;

[0036] The memory is used to store a computer program;

[0037] The processor is used to execute the computer program to implement the method as described above.

[0038] In a specific embodiment of the present invention, a computer storage medium is further provided, on which a computer program is stored, and when the computer program is executed by a processor, the method as described above is implemented.

[0039] In a specific embodiment of the present invention, a non-linear node detection device is further provided, including the non-linear node determination device as described above.

[0040] Implementing a non-linear node determination method and related devices according to an embodiment of the present invention has at least the following beneficial effects: Since this embodiment determines whether there is a non-linear node in the detected target area based on the state change of the harmonic signal, the unstable characteristics of the harmonic signal of the false node can be used to distinguish it from the non-linear node, realizing the rapid identification of the non-linear node. The entire determination method is more intuitive, simple to operate and has high efficiency, and the requirement for the professional level of the operator is also relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

[0042] Figure 1 is the program flowchart of the first embodiment of the non-linear node judgment method of the present invention;

[0043] Figure 2 is the program flowchart of the second embodiment of the non-linear node judgment method of the present invention;

[0044] Figure 3 is the program flowchart of the third embodiment of the non-linear node judgment method of the present invention;

[0045] Figure 4 is the time-domain curve of the true node and the false node including the rising segment curve;

[0046] Figure 5 is the program flowchart of the fourth embodiment of the non-linear node judgment method of the present invention;

[0047] Figure 6 is the time-domain curve graph of the true node in the stable and vibrating states of the detection target area;

[0048] Figure 7 is the time-domain curve graph of the false node in the stable and vibrating states of the detection target area;

[0049] Figure 8 is the program flowchart of the fifth embodiment of the non-linear node judgment method of the present invention;

[0050] Figure 9 is the time-domain curve graph of the false node when the fundamental wave signal source shakes;

[0051] Figure 10 is the program flowchart of the sixth embodiment of the non-linear node judgment method of the present invention;

[0052] Figure 11 is the module diagram of an embodiment of the non-linear node judgment device of the present invention. Specific Embodiments

[0053] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0054] It can be understood that the non-linear node determination method provided by the embodiments of the present invention can be applied to various non-linear node detection devices. That is, in the process of detecting a target area by a non-linear node detection device, the true and false nodes can be distinguished relatively quickly through the non-linear node determination method provided by this embodiment. This method can be implemented based on the functional modules or software programs set inside the non-linear node detection device, or can be implemented by a host device having a signal connection relationship with the non-linear node detection device, or some steps can be executed by a machine and some steps can be executed by a person.

[0055] First of all, it should be noted that during the detection process of the non-linear node detection device, a pure metal object may be misreported as a non-linear node. Pure metal objects, such as keychains, metal parts with irregular shapes and small gaps, etc., will form a structure similar to a non-linear node (defined as a false node). Since the false node will also radiate second and third harmonic signals under the action of the fundamental wave, during the operation of the non-linear node detection device, in addition to receiving the second and third harmonic signals radiated by the true non-linear node (i.e., the true node), it will also receive the second and third harmonic signals radiated by the false node, which will lead to a relatively high false alarm rate of the non-linear node detection device. One of the solutions is to directly display the signal intensity of the second and third harmonic signals received by the non-linear node detection device to the operator in numerical form, so that the operator can judge whether there is a true node or a false node in the detection area according to the signal intensity. This method makes the whole judgment process not intuitive enough, and the accuracy of the judgment result depends on professional operators. For non-professional operators, it is extremely easy to cause misjudgment. Moreover, the judgment efficiency of the whole process is relatively low, far from meeting the on-site application requirements. To solve the above problems, the embodiments of the present invention provide a non-linear node determination method and related devices.

[0056] As Figure 1 , shows an embodiment of the non-linear node determination method provided by the present invention. In Figure 1 In the non-linear node determination method shown, the non-linear node determination method includes the following steps:

[0057] S1. Obtain the harmonic signals radiated by the target object in the detected target area.

[0058] S2. Determine whether there is a non-linear node in the detected target area based on the state change of the harmonic signals.

[0059] It should be noted that, based on a large number of experiments conducted by the inventor, since the true node (non-linear node) has a stable volt-ampere characteristic curve, the harmonic signals radiated by it will be relatively stable. According to the above content, the false node (pure metal item) may have characteristics similar to those of a non-linear node due to the narrow gaps existing in it or when two metal components are lapped, and thus may be misidentified as a true node. However, the characteristics of its own material are different from those of the non-linear node, and the real-time state of the lapped false node may change. Therefore, the volt-ampere characteristic curve of the false node is not stable, and the radiated harmonic signals are also not stable.

[0060] On this basis, in the non-linear node determination method provided by the embodiments of the present invention, by obtaining the harmonic signals radiated by the target object and according to the different variation rules of the true and false nodes reflected in the harmonic signals, the true and false nodes can be distinguished. For example, if the harmonic signals are relatively stable, it is determined as a true node; if the harmonic signals are not stable, it is determined as a false node. Among them, the state change of the harmonic signals can be presented by generating any recognizable manner based on the harmonic signals. For example, using the time-domain curve (the time-domain curve is the curve of the amplitude of the harmonic signals changing with time), using the text alarm result (generating the corresponding text alarm result based on the comparison result of the intensity of the harmonic signals and the threshold, such as when exceeding the threshold, outputting "non-linear node", otherwise outputting "error"), using the sound alarm result (generating the corresponding sound alarm result based on the comparison result of the intensity of the harmonic signals and the threshold, such as when exceeding the threshold, emitting the sound of "non-linear node"), using the light (controlling the color of the light based on the comparison result of the intensity of the harmonic signals and the threshold, such as when exceeding the threshold, controlling the light to display red), etc. to reflect the change state of the harmonic signals. It should be noted that the above-mentioned "the intensity of the harmonic signals exceeds the threshold" does not necessarily mean it is a non-linear node, and it can only reflect the magnitude of the value of the intensity of the harmonic signals in the current state. It is also necessary to combine the state change of the harmonic signals to identify the true and false nodes. For example: if using the time-domain curve, when the fluctuation of the time-domain curve is small, it can be considered as a true node; if using the text alarm result, when "non-linear node" is always output, it can be considered as a true node, and when "non-linear node" and "error" are switched output without a rule, it can be considered as a false node.

[0061] It should be noted that the above step S1 can be implemented by a non-linear node detection device. The above step S2 can be implemented by a non-linear node detection device, or can be processed and implemented by a host device having a signal connection relationship with the non-linear node detection device, or part of the steps can be executed by a machine and part of the steps can be executed by a person.

[0062] Therefore, in this embodiment, since it is very easy to judge whether the state of the harmonic signal changes without paying attention to specific values (such as the intensity of the harmonic signal), it is possible to directly judge whether the detected target is a true node by using the change of the state of the harmonic signal and combining the change rules of the harmonic signals corresponding to the true and false nodes. The non-linear node judgment method provided by the embodiment of the present invention is more intuitive and fast, and has a lower requirement for the professional level of the operator, thereby improving the efficiency of identifying non-linear nodes.

[0063] In some embodiments, the step of determining whether there is a non-linear node in the detected target area based on the change of the state of the harmonic signal includes:

[0064] S20. Generate a corresponding time-domain curve based on the harmonic signal to determine whether there is a non-linear node in the detected target area based on the time-domain curve.

[0065] Based on the above embodiments, in the non-linear node judgment method provided by the embodiment of the present invention, by processing the obtained harmonic signal, a time-domain curve corresponding to the harmonic signal can be obtained. Therefore, in this embodiment, it is not only to display the intensity of the harmonic signal detected once, but to display the detection result in the form of a time-domain curve, and then to judge the true node and the false node based on the characteristics of the time-domain curve. According to the time-domain curve, it can be very intuitive to reflect whether the harmonic signal is stable (for example, a curve approximately a straight line in the time-domain curve is stable, and an irregular jitter in the time-domain curve is unstable). Combining the above change rules of the harmonic signals corresponding to the true and false nodes (that is, the harmonic signal corresponding to the true node is stable, while the harmonic signal corresponding to the false node is unstable), it can be directly judged whether the detected object is a true node. Since the time-domain curve is a concrete line, it can more intuitively and quickly reflect the change of the state of the harmonic signal, and it is easier and faster to judge, and has a lower requirement for the professional level of the operator, thereby improving the efficiency of identifying non-linear nodes.

[0066] The following description takes the execution subject as a non-linear detection node detection device to explain the non-linear node judgment method proposed by the embodiment of the present invention.

[0067] Among them, during the working process of the non-linear node detection device (hereinafter referred to as the detection device), the signal transmitting unit of the detection device generates a fundamental wave signal and radiates it outward. When there is a true node or a false node in the detected target area, a corresponding harmonic signal will be formed under the influence of the fundamental wave signal.

[0068] During the detection process of nonlinear nodes, the detection device can perform operations such as filtering, amplifying, and frequency conversion on the received harmonic signals to obtain intermediate-frequency signals or low-frequency signals. The intermediate-frequency signals or low-frequency signals are sampled by a signal acquisition unit (such as an ADC) to obtain time-domain signals, and then Fourier transform or fast Fourier transform is performed to transform the time-domain signals into frequency-domain signals. The amplitude of the center frequency point of the frequency-domain signal is used to represent the signal strength of this sampling. Therefore, in this embodiment, complex time-domain signals are converted into frequency-domain representations. Moreover, the signal acquisition unit samples once every certain period of time (for example, 50 ms). Each time a sample is taken, there will be a signal strength (i.e., a point). As time changes, many points ultimately form the time-domain curve corresponding to the harmonic signal. It should be noted that Figure 4 、 6 、7, and 9, the ordinate of the time-domain curve represents the signal strength, and the abscissa represents the time.

[0069] During the specific judgment process of the detection device, the internal program of the detection device can be used to judge whether the detection target area contains nonlinear nodes based on the obtained time-domain curve, or the user can also judge whether there are nonlinear nodes in the detection target area according to the time-domain curve generated by the detection device. Considering that when there are nonlinear nodes in the detection target area, the nonlinear nodes will generate stable harmonic signals under the influence of the fundamental wave signal, while the harmonic signals generated by false nodes are unstable, and the stability of the harmonic signals can be reflected in the time-domain curve of the harmonic signals. Therefore, the judgment result of the nonlinear nodes can be obtained according to the time-domain curve of the final harmonic signal. In the embodiment of the present invention, the unstable characteristics of the false nodes reflected in the time-domain curve and the stable characteristics of the true nodes in the time-domain curve are used to judge the nonlinear nodes. Since the characteristics of the time-domain curve are relatively intuitive and obvious, the effect of quickly identifying nonlinear nodes can be achieved, and there is no need to improve the professional level of the operator.

[0070] In one embodiment, as Figure 2 shown, in step S1, the harmonic signals include the second harmonic signal and the third harmonic signal corresponding to the fundamental wave signal. That is, the process of obtaining the harmonic signals radiated by the target object in the detection target area may include step S1A, specifically obtaining the second harmonic signal and the third harmonic signal corresponding to the fundamental wave signal radiated by the target object in the detection target area. Step S2 includes step S21, specifically generating the second-order time-domain curve corresponding to the second harmonic signal and the third-order time-domain curve corresponding to the third harmonic signal when both the second harmonic signal and the third harmonic signal are obtained simultaneously, so as to judge whether there are nonlinear nodes in the detection target area according to the second-order time-domain curve and the third-order time-domain curve.

[0071] Specifically, the detection device can analyze based on the acquired second harmonic signal and third harmonic signal. Moreover, it should be noted that only when both the second harmonic signal and the third harmonic signal are received simultaneously, the step of determining whether there is a non-linear node in the detected target area is executed. It can be understood that when the detection device operates, it can generate and transmit a fundamental wave signal, and the frequency of the fundamental wave signal can be set and adjusted according to actual needs. Among them, the second harmonic signal and the third harmonic signal corresponding to the fundamental wave signal mean that the frequency bands of the second harmonic signal and the third harmonic signal both depend on the fundamental wave signal. The frequency of the second harmonic signal is twice that of the fundamental wave signal, and the frequency of the third harmonic signal is three times that of the fundamental wave signal.

[0072] In this embodiment, after the corresponding second harmonic signal and third harmonic signal are acquired simultaneously, after performing time-domain transformation on the second harmonic signal and the third harmonic signal respectively, the second-order time-domain curve corresponding to the second harmonic signal and the third-order time-domain curve corresponding to the third harmonic signal can be obtained respectively, so as to perform a specific determination process according to the curve characteristics of the obtained second-order time-domain curve and third-order time-domain curve, such as the stability of the curve. Since the non-linear node will generate both second and third harmonic signals at the same time, that is, both of these signals will directly reflect the characteristics of the non-linear node, so identifying the non-linear node based on the second-order time-domain curve and the third-order time-domain curve simultaneously can improve the accuracy of identification.

[0073] In one embodiment, as Figure 3 shown, in step S21, determining whether there is a non-linear node in the detected target area according to the second-order time-domain curve and the third-order time-domain curve includes step S21A, specifically: when the second harmonic signal and the third harmonic signal are acquired simultaneously, generate the second-order time-domain curve corresponding to the second harmonic signal and the third-order time-domain curve corresponding to the third harmonic signal respectively, obtain the rising section curve in the second-order time-domain curve and the third-order time-domain curve, and determine whether there is a non-linear node in the detected target area according to the rising section curve.

[0074] It should be noted that the time-domain curve includes the entire process from not detecting the target object to detecting the target object. Among them, the stage from the start of receiving the harmonic signal to the steady state is defined as the rising stage (corresponding to the process of the detection device from the start of receiving the harmonic signal to continuously receiving the harmonic signal, for example Figure 4 the process between time point t1 and time point t2 in), and the curve in the rising stage is the above-mentioned rising section curve. The rising section curve has a large slope and is in a relatively fast-changing stage. After passing through this rising stage, the slope will gradually become smaller, and the curve enters a state that is relatively stable compared with the rising section curve, which can be defined as the stable stage.

[0075] When the detection device detects a non-linear node, since the non-linear node has a stable volt-ampere characteristic curve, the corresponding second-harmonic signal and third-harmonic signal are also relatively stable, which is specifically manifested as follows: If the parameters during the detection process are kept unchanged, for example, when the detection distance between the detection device and the detection target area remains unchanged, the second-order time-domain curve and the third-order time-domain curve show a steady upward state during the rising stage. It can be understood that there is no obvious jitter in the rising stage of the second-order time-domain curve and the third-order time-domain curve. At the same time, the intensity of the second-order time-domain signal must be greater than the intensity of the third-order time-domain signal. Specifically, reference can be made to Figure 4 the curve graph shown in (A). Among them, F1 is the second-order time-domain curve, and F2 is the third-order time-domain curve. It can be seen that during the rising stage of curve F1 and curve F2, the amplitude change of the time-domain curve has been in a relatively stable state, that is, during the rising stage of the time-domain curve, the slope is relatively stable. Generally speaking, there is no obvious jitter in the rising stage of the time-domain curve, and the slope is always greater than zero. When a false node is detected, since the false node does not have a stable volt-ampere characteristic curve, the corresponding second-order time-domain curve and third-order time-domain curve will have obvious jitter during the rising stage, that is, the slope may switch irregularly between being greater than zero and less than zero. Even if the parameters of the detection process are kept unchanged at this time, for example, when the detection distance between the detection device and the detection target area remains unchanged, the rising-section curves of the second-order time-domain curve and the third-order time-domain curve will still have jitter. Specifically, reference can be made to Figure 4 the curve graph of (B), where F1 is the second-order time-domain curve corresponding to the second-harmonic signal, and F2 is the third-order time-domain curve corresponding to the third-harmonic signal. Therefore, in the specific judgment process, the true and false nodes can be distinguished based on the jitter situation of the rising-section curve. Through the above method, the true and false nodes can be identified based on the rising-section curve at the beginning of the response, thereby improving the identification speed.

[0076] Based on the above process, in one embodiment, determining whether there is a non-linear node in the detection target area according to the rising-section curve includes: when the slope of the rising-section curve in the second-order time-domain curve is greater than zero within the first preset time, and the slope of the rising-section curve in the third-order time-domain curve is greater than zero within the first preset time, and at any moment, the amplitude of the rising-section curve of the second-order time-domain curve is greater than the amplitude of the third-order time-domain curve, it is determined that there is a non-linear node in the detection target area.

[0077] That is, in the specific determination process, it is determined whether the detection target area is a non-linear node according to the slope change situation of the second-harmonic signal and the third-harmonic signal during the rising stage. For example: For a true node, the rising-section curve of the second-order time-domain curve, within the first preset time, for example Figure 4The duration between time point t1 and time point t2 in is such that the slope of the second-order time-domain curve is always greater than zero, that is, the second-order time-domain curve is steadily rising within the first preset time, and there is no obvious jitter during the rising process of the second-order time-domain curve. In other words, the second harmonic signal will rise steadily after it is detected. At the same time, the jitter degree of the rising section curve of the third-order time-domain curve of the true node also meets the corresponding requirements. Similar to the second-order time-domain curve, it will not be elaborated here. In addition, for the true node, the amplitude of the rising section curve of the second-order time-domain curve is always greater than the amplitude of the rising section of the third-order time-domain curve, that is, from the moment the harmonic signal is first detected, the amplitude of the second harmonic signal is always greater than the amplitude of the third harmonic signal.

[0078] Further, if the slope of the rising section curve in the second-order time-domain curve is negative within the first preset time, that is, the second-order time-domain curve does not rise steadily within the first preset time, an inflection point will appear at the point where the slope is negative, and the state will change from rising to falling, or from falling to rising, and there is obvious jitter in the second-order time-domain curve. At the same time, the jitter situation of the rising section curve of the third-order time-domain curve of the false node is the same as that of the second-order time-domain curve, which will not be elaborated here. Therefore, as long as the slope of the second-order time-domain curve or the third-order time-domain curve is negative within the first preset time, it can be determined that there is no non-linear node in the detected target area. In addition, if the amplitude of the second-order time-domain curve is less than or equal to the amplitude of the third-order time-domain curve at any moment, it can also be determined that there is no non-linear node in the detected target area.

[0079] Among them, the first preset time can be set as needed. For example, it can be less than or equal to the duration between the starting point (such as Figure 4 t1 in ) and the ending point (such as Figure 4 t2 in ) of the rising section curve.

[0080] In an embodiment, as shown in Figure 5 , in step S1, that is, the step of obtaining the harmonic signal radiated by the target in the detected target area, it may include step S1B, specifically obtaining the first second harmonic signal and the first third harmonic signal radiated by the target when the detected target area is in a vibrating state. Step S21 includes step S21B, specifically, when the first second harmonic signal and the first third harmonic signal are obtained simultaneously, generating the first second-order time-domain curve corresponding to the first second harmonic signal and the first third-order time-domain curve corresponding to the first third harmonic signal, so as to determine whether there is a non-linear node in the detected target area based on the first second-order time-domain curve and the first third-order time-domain curve.

[0081] Specifically, when obtaining harmonic signals, it includes, but is not limited to, causing vibrations in the detected target area by means such as knocking, and part of the vibrations generated in the detected target area can be conducted to the target object, forcing the target object to vibrate as well. The purpose is to observe whether the time-domain curve corresponding to the target object will jitter with the vibration. Then, obtain the harmonic signals corresponding to the detected target area during vibration, that is, the first second-harmonic signal and the first third-harmonic signal, for the specific non-linear node judgment process.

[0082] It should be noted that since the true node has a stable volt-ampere characteristic curve, the generated second- and third-harmonic signals are also relatively stable. Even if the detected target area is knocked to make it vibrate, it will not have a great impact on the time-domain curve corresponding to the true node, that is, the jitter amplitude of the time-domain curve obtained during the knocking process will not be very large. However, since the false node does not have a stable volt-ampere characteristic curve, if there is a false node in the target detection area, under the influence of the knocking action, the radiated second- and third-harmonic signals will also change significantly, and then the time-domain curve corresponding to the false node will also change significantly accordingly, that is, obvious jitter will occur. Therefore, it can be judged whether there is a non-linear node in the detected target area according to the obtained time-domain curve. Through this embodiment, the judgment process of non-linear nodes can be carried out quickly while improving the accuracy of non-linear node judgment and reducing misjudgment.

[0083] In one embodiment, the steps of determining whether there is a non-linear node in the detected target area based on the first second-order time-domain curve and the first third-order time-domain curve include: when the difference between the maximum value and the minimum value of the amplitude within the second preset time in the first second-order time-domain curve is less than the first preset value, and the difference between the maximum value and the minimum value of the amplitude within the second preset time in the first third-order time-domain curve is less than the second preset value, and at any moment the amplitude of the first second-order time-domain curve is greater than the amplitude of the first third-order time-domain curve, it is determined that there is a non-linear node in the detected target area; otherwise, it is determined that there is no non-linear node in the detected target area.

[0084] It should be noted that the inventor measured based on a large amount of experimental data that when there is a non-linear node in the detected target area and the detection process is stable, the detection device can obtain Figure 6 the curve graph shown in (C), where F1 is the second-order time-domain curve corresponding to the second-harmonic signal and F2 is the third-order time-domain curve corresponding to the third-harmonic signal. It can be found that the second-order time-domain curve and the third-order time-domain curve are in a relatively stable state. When knocking on the detected target area, the detection device can obtain Figure 6The curve shown in (D). Based on this curve, it can be found that the amplitudes of the second-order time-domain curve and the third-order time-domain curve will change slightly after tapping, but the change amplitude is small. However, after the tapping ends, both the second-order time-domain curve and the third-order time-domain curve will quickly return to the stable state. When there is a false node in the detected target area, during the stable detection process, such as when the detection distance of the detection device remains unchanged, the curve shown in Figure 7 (E) can be obtained. Among them, F1 is the second-order time-domain curve corresponding to the second harmonic signal, and F2 is the third-order time-domain curve corresponding to the second harmonic signal. It can be found that both the second-order time-domain curve and the third-order time-domain curve are in an unstable state, and the amplitudes of the second-order time-domain curve and the third-order time-domain curve will have slight jitter. After tapping the detected target area, due to the instability of the false node, the corresponding second-order time-domain curve and third-order time-domain curve will both have relatively serious jitter. It can be seen that there is a big difference in the states of the time-domain curves corresponding to the true node and the false node after tapping. Therefore, it is possible to judge whether there is a non-linear node in the detected target area by observing the change of the time-domain curve after tapping. For example, if when tapping the detected target area, the curve obtained by the detection device is similar to the curve D in Figure 6 , it can be determined that there is a non-linear node in the detected target area. If the curve obtained by the detection device is similar to the curve shown in Figure 7 (F), it can be determined that there is a false node in the detected target area.

[0085] In addition, the first preset value and the second preset value can be set according to the actual situation. They can be the same or different. The second preset time can be set as needed. The length of the second preset time can be the same as or different from the length of the first preset time.

[0086] The second preset time is different from the first preset time (including that the first preset time and the second preset time have no intersection at all, or the first preset time and the second preset time have an intersection). For example, the second preset time is later than the first preset time. Specifically, for example: According to Figure 6 and Figure 7 , it can be known that for the different characteristics of the true and false nodes reflected in the time-domain curve under the tapping state, they are all for the stable stage of the time-domain curve (that is, the stage after the rising stage). Therefore, the starting point of the second preset time can be after the end point of the above-mentioned first preset time, that is, the time period where the second preset time is located is in the stable stage after the rising stage. Then, through the different characteristics of the above-mentioned true and false nodes after tapping, they can be distinguished.

[0087] In step S21B, in the specific determination process, based on the jitter conditions of the time-domain curves corresponding to the second-harmonic signal and the third-harmonic signal when detecting the vibration of the target area, it is determined whether the target area to be detected is a non-linear node. If the amplitude jitter degree of the first second-order time-domain curve of the detection device is relatively low, that is, it can be understood that the difference between the maximum value and the minimum value of the amplitude within the second preset time is less than the first preset value, and at the same time the amplitude jitter degree of the first third-order time-domain curve is also relatively low, that is, it can be understood that the difference between the maximum value and the minimum value of the amplitude within the second preset time is less than the second preset value, and when the amplitude of the first second-order time-domain curve is always greater than the amplitude of the first third-order time-domain curve, it can be determined that there is a non-linear node in the current detection target area.

[0088] Optionally, the first preset value is less than or equal to 100mv. And / or, the second preset value is less than or equal to 100mv. The first preset value and the second preset value can be the same or different.

[0089] In a specific embodiment, both the first preset value and the second preset value can be set to 100mv. That is, during the detection process, if the difference between the maximum value and the minimum value of the amplitude of the first second-order time-domain curve within the second preset time is less than 100mv, and the difference between the maximum value and the minimum value of the amplitude of the first third-order time-domain curve within the second preset time is less than 100mv, it indicates that the second-harmonic signal and the third-harmonic signal radiated by the target in the detection target area do not have obvious jitter. Therefore, it can be determined that there is a non-linear node in the detection target area. That is, if the amplitude jitter degrees of the first second-order time-domain curve and the first third-order time-domain curve are both less than 100mv, it indicates that the second-harmonic signal and the third-harmonic signal are generated by non-linear nodes.

[0090] It should be noted that the degree of "jitter" mentioned in this embodiment can be reflected by the amplitude difference between two adjacent extreme points in the time-domain curve, that is, the larger the amplitude difference, the greater the degree of jitter. Due to the principle in this embodiment, it corresponds to the stable stage of the time-domain curve, and compared with the curve in the rising stage, the amplitude of the curve in the stable stage does not change significantly with time without external stimulation. Therefore, in the judgment, the judgment process can be simplified. It is not necessary to rely on the slope, and only need to judge whether the difference between the maximum value and the minimum value of the amplitude is greater than the first preset value to determine whether there is obvious jitter in the time-domain curve. For example, within the second preset time, if the difference between the maximum value and the minimum value of the amplitude is greater than the first preset value, then there is at least one "obvious jitter" in the time-domain curve within the second preset time. As long as there is "obvious jitter", it is determined that the target is a false node, and it is not necessary to judge the number of "jitters".

[0091] The non-linear node judgment method provided by the embodiments of the present application can comprehensively identify true and false nodes by combining the characteristics of the above-mentioned rising segment curve and stable segment curve. Based on this, the following implementation methods can be obtained.

[0092] In one example, after performing step S21A, if the judgment result is that there is no non-linear node in the detected target area, steps S1B and S21B can be further performed. That is, after judging the jitter degree of the second-order time-domain curve and the third-order time-domain curve in the rising stage through step S21A (the specific judgment process refers to the corresponding process of step S21A), if no non-linear node is detected, the area where the target object is located can be further tapped in the stable stage of the second-order time-domain curve and the third-order time-domain curve, and based on the change mode of the time-domain curves corresponding to the first second harmonic and the first third harmonic obtained after the tapping, it can be judged whether there is a non-linear node. Through this embodiment, after obtaining the preliminary judgment result of the non-linear node, the judgment result can be further confirmed to avoid missing the non-linear node in the detected target area, and the false alarm rate of the detection device during the detection process can be reduced.

[0093] Alternatively, in other embodiments, after performing step S21A, if the judgment result is that there is a non-linear node in the detected target area, steps S1B and S21B are still further performed. In this way, by comprehensively considering the situations in the rising stage and the stable stage, it can be judged whether there is a non-linear node in the detected target area, and the detection accuracy can be improved.

[0094] As Figure 8 shown, in one embodiment, in step S1, the step of obtaining the harmonic signals radiated by the target object in the detected target area may further include: S1C, obtaining the second second harmonic signal and the second third harmonic signal radiated by the target object in the detected target area when the fundamental wave signal source shakes. Step S21 may further include: S21C, when the second second harmonic signal and the second third harmonic signal are obtained simultaneously, respectively generating a second second-order time-domain curve corresponding to the second second harmonic signal and a second third-order time-domain curve corresponding to the second third harmonic signal, so as to judge whether there is a non-linear node in the detected target area based on the second second-order time-domain curve and the second third-order time-domain curve.

[0095] Specifically, it includes, but is not limited to, making the fundamental wave signal source inside the detection device shake by means of shaking the detection device. The inventor measured based on a large amount of experimental data that when the fundamental wave signal source shakes, the fundamental wave signal emitted by the detection device will also change to a certain extent. Obtain the harmonic signals corresponding to the shaking of the fundamental wave signal source. Specifically, the second second harmonic signal and the second third harmonic signal corresponding to the fundamental wave signal emitted by the fundamental wave signal source can be obtained. Perform processing such as Fourier transform or fast Fourier transform on the obtained second second harmonic signal and second third harmonic signal respectively, and then obtain the corresponding second-order time domain curve and second-third-order time domain curve based on the transformed results. Considering that when the detection device shakes, the relative position relationship between the detection device and the detection target area, as well as the radiation angle of the fundamental wave signal, etc. will change. When there are nonlinear nodes in the current detection target area, since the nonlinear nodes are stable structures, the time domain curve of the harmonic signals generated by them will not produce large jitters. That is, when the fundamental wave signal source shakes, the jitters of the corresponding second-order time domain curve and second-third-order time domain curve are not obvious, similar to the curve shown in Figure 6 (D). If there are false nodes in the current detection target area, as shown in Figure 10 , due to the instability of the false nodes, when the position relationship between the detection device and the detection target area changes, or the radiation direction and angle of the fundamental wave signal radiated to the detection target area change, the harmonic signals generated by the false nodes will also show irregular changes, and the amplitude changes of the obtained time domain curve are also irregular, and the amplitude jitter degree of the corresponding curve will be larger. Therefore, the nonlinear nodes can be judged based on this difference. That is, during the shaking process of the detection device, when the amplitude jitters of the second-order time domain curve and the third-order time domain curve are not obvious, it is determined that there are nonlinear nodes in the current detection target area. If during the shaking process of the detection device, the amplitude jitters of the second-order time domain curve and the third-order time domain curve are relatively obvious, it is determined that there are no nonlinear nodes in the current detection target area.

[0096] The detection device provided in the embodiment of the present application can include multiple working modes. For example, in one working mode of the detection device, it can also execute Figure 8The determination method shown, that is, through step S21A, after determining the amplitude jitter degree of the second-order time-domain curve and the third-order time-domain curve in the rising stage (for the specific determination process, refer to the corresponding process of step S21A), further, through a shaking detection device in the steady stage of the second-order time-domain curve and the third-order time-domain curve, and based on the second-order time-domain curve corresponding to the second second harmonic and the third-order time-domain curve corresponding to the second third harmonic obtained after shaking, to determine whether there are non-linear nodes in the detected target area. That is, it is possible to comprehensively identify whether there are non-linear nodes in the detected target area based on the determination results in the rising stage and the determination results after shaking the detection device in the stable stage. Through this embodiment, after obtaining the preliminary determination result of the non-linear node, the determination result can be further confirmed to further reduce the false negative rate and improve the detection accuracy.

[0097] In another example, it can also be to first execute the first determination method (step S21A), and then execute the second determination method (as shown in Figure 5 ), the third determination method (as shown in Figure 8 ), and comprehensively determine whether there are non-linear nodes in the detected target area based on these three determination methods. This method can also reduce the false negative rate of the detection device during the detection process and improve the detection accuracy.

[0098] In an embodiment, the step of determining whether there are non-linear nodes in the detected target area based on the second second-order time-domain curve and the second third-order time-domain curve includes: when the difference between the maximum value and the minimum value of the amplitude within the third preset time in the second second-order time-domain curve is less than the third preset value, the difference between the maximum value and the minimum value of the amplitude within the third preset time in the second third-order time-domain curve is less than the fourth preset value, and the amplitude of the second second-order time-domain curve is greater than the amplitude of the second third-order time-domain curve, it is determined that there are non-linear nodes in the detected target area; otherwise, it is determined that there are no non-linear nodes in the detected target area.

[0099] In step S21C, when the detection device shakes to make the fundamental wave signal source shake, it is possible to determine whether there are non-linear nodes in the detected target area based on the jitter conditions of the second-order time-domain curve and the third-order time-domain curve. The amplitude jitter degree of the second second-order time-domain curve obtained by the detection device needs to meet the corresponding requirements, that is, it can be understood that the difference between the maximum value and the minimum value of the amplitude of the obtained second second-order time-domain curve within the third preset time is less than the third preset value. At the same time, the amplitude jitter degree of the second third-order time-domain curve meets the corresponding requirements, that is, it can be understood that the difference between the maximum value and the minimum value of the amplitude of this second third-order time-domain curve within the third preset time is less than the fourth preset value. Moreover, based on the characteristics of non-linear nodes, when the amplitude of the simultaneously obtained second second-order time-domain curve is always greater than the amplitude of the second third-order time-domain curve, it can be determined that there are non-linear nodes in the current detected target area.

[0100] As can be seen from the above, since the second and third harmonic signals radiated by the false node will also generate significant jitters as the detection device shakes. Therefore, the difference between the maximum and minimum amplitudes of the second second-order time-domain curve within the third preset time will be relatively large, for example, greater than the third preset value. At the same time, the difference between the maximum and minimum amplitudes of the second third-order time-domain curve within the third preset time will also be relatively large, for example, greater than the fourth preset value. At the same time, due to the irregular amplitude jitters, the obtained time-domain curve may show a situation where the amplitude of the second second-order time-domain curve is less than the amplitude of the second third-order time-domain curve. Therefore, when the detection device shakes, if one or more of the above situations occur in the obtained time-domain curve, it can be determined that there is no non-linear node in the current detection target area. Specifically, reference can be made to the Figure 9 (G) shown in the curve graph and Figure 9 (H) shown in the curve graph. Compared with Figure 6 (D) shown in the curve graph, Figure 9 (H) shown in the curve graph, the amplitude of the time-domain curve will show an irregular change, that is, jitter occurs. Therefore, when the detection device shakes, if the change in the obtained curve is not obvious compared with the curve before the detection device shakes, it can be determined that there is a non-linear node in the current detection target area. The length of the third preset time can be the same as or different from the lengths of the first preset time and the second preset time. And, the third preset time is after the above-mentioned first preset time, that is, the starting point of the third preset time can be in the stable stage of the time-domain curve.

[0101] Optionally, the third preset value is less than or equal to 100mv. And / or, the fourth preset value is less than or equal to 100mv. The third preset value and the fourth preset value can be the same or different.

[0102] According to Figure 6 (D) in the curve, the inventor measured through a large number of experiments that when the detection target area is knocked, the time-domain curve corresponding to the harmonic signal radiated by the non-linear node will generate slight jitters, but after the knocking ends, the time-domain curve will quickly return to a stable state. And according to Figure 7 (F) in the curve, it can be seen that the time-domain curve corresponding to the harmonic signal radiated by the false node will be in a state of severe jitter for a long time when the detection target area is knocked. Therefore, this property can also be used to distinguish between true and false nodes.

[0103] In some embodiments of the present application, the step of determining whether there is a non-linear node in the detection target area based on the second second-order time-domain curve and the second third-order time-domain curve may further include:

[0104] Step S21D: When the difference between the maximum and minimum amplitudes within the fourth preset time in the second second-order time-domain curve is less than the fifth preset value, the difference between the maximum and minimum amplitudes within the fourth preset time in the second third-order time-domain curve is less than the sixth preset value, and the amplitudes of the second second-order time-domain curve are all greater than those of the second third-order time-domain curve, it is determined that there are non-linear nodes in the detected target area; otherwise, it is determined that there are no non-linear nodes in the detected target area.

[0105] Among them, the duration of the fourth preset time can be adjusted according to different modes or different application scenarios of the detection device. The starting point of the fourth preset time can be after the end point of the above-mentioned third preset time, that is, the time period where the fourth preset time is located is in the recovery stage of the time-domain curve after knocking. Through the different characteristics of the true and false nodes in the recovery stage after knocking, they can be distinguished. And, according to Figure 6 and Figure 7 it can be seen that the time-domain curve of the true node is approximately a straight line after recovery. Therefore, the fifth preset value can be less than the above-mentioned first preset value, and the sixth preset value can be less than the above-mentioned second preset value. As long as the time-domain curve in the recovery stage jitters slightly, it can be determined as a false node.

[0106] In addition to the method of judging true and false nodes by the jitter of the time-domain curve in the above-mentioned embodiment, other methods can also be used, such as distinguishing true and false nodes by the state change of the alarm result. In one embodiment, the steps of determining whether there are non-linear nodes in the detected target area based on the state change of the harmonic signal include:

[0107] S21E: Generate an alarm result based on the harmonic signal to determine whether there are non-linear nodes in the detected target area based on the state change of the alarm result.

[0108] It should be noted that the alarm result in this embodiment can be an alarm result obtained according to judgment conditions such as the intensity size relationship of the second and third harmonic signals, and the judgment logic of the alarm result is not specifically limited.

[0109] In this embodiment, after obtaining the harmonic signal, the alarm result is obtained according to the harmonic signal. For the true node, its state is relatively stable, and the radiated harmonic signal is also relatively stable. Therefore, the obtained alarm result will always be the same result (for example, a non-linear node alarm result). For the false node, its radiated harmonic signal is unstable, so the obtained alarm result will keep changing. For example, when there is a false node in the detected target area, the obtained alarm result is one of the non-linear node alarm and the metal node alarm, and they keep alternating. Furthermore, the true and false nodes can be distinguished according to the state change of the alarm result. As long as the alarm result changes, it can be determined that there is a false node in the detected target area, which is more intuitive and fast to judge.

[0110] In some embodiments, the third second harmonic signal and the third third harmonic signal radiated by the detection target area when the detection target area vibrates can be obtained. If the signal strength of the third second harmonic signal is greater than the signal strength of the third third harmonic signal, a nonlinear node alarm result is obtained, otherwise a metal node alarm result is obtained (it can be understood that the alarm result can also be directly output by the comparison result of the intensity of the harmonic signal and the threshold). Since the harmonic signal radiated by the false node itself is unstable, when the detection target area vibrates, the vibration is transmitted to the false node, and the harmonic signal radiated by the false node will be more unstable. Therefore, if the alarm result is obtained and switches back and forth between the nonlinear node alarm result and the metal node alarm result, it can be determined that the target object in the detection target area is a false node, otherwise it can be determined that the target object in the detection target area is a true node. When the detection target area vibrates, the state change of the alarm result will be more obvious (for example, the frequency of the alarm result switching will be higher), and the accuracy will also be higher.

[0111] It should be noted that when the detection target area does not vibrate, that is, when the detection target area is stationary, true and false nodes can also be distinguished by the state change of the alarm result. The principle of distinguishing true and false nodes based on the state change of the alarm result is the same as the above embodiment.

[0112] Since the detection device may slightly shake during the detection process, or the detection distance may change, these situations may also cause the alarm result to switch. Therefore, in order to reduce the false alarm rate, in some embodiments, after obtaining the alarm result, it can be determined whether the number of switching times of the alarm result within the fifth preset time (for example, switching from the nonlinear node alarm result to the metal node alarm result is 1 time, and switching from the metal node alarm result to the nonlinear node alarm result is also 1 time) is greater than the seventh preset value. If so, it is determined that there is no nonlinear node in the detection target area, otherwise it is determined that there is a nonlinear node in the detection target area.

[0113] The seventh preset value may be between 2 and 10, and the fifth preset time may be 1 to 3 seconds in the stable stage. Those skilled in the art may select and adjust the fifth preset value and the fifth preset time according to actual needs.

[0114] Among them, the specific display method of the alarm result can be, for example: directly outputting the alarm result in text form (such as outputting the text words "non-linear node" or "metal node"), or using photoelectric means to output the alarm result (such as when the color of the light is red, it means "non-linear node", and when the color of the light is other colors, it means "metal node").

[0115] In one embodiment, if Figure 10As shown in the figure, in the non-linear node determination method according to an embodiment of the present invention, step S3 may further be included: if the second harmonic signal and the third harmonic signal cannot be obtained simultaneously, it is determined that there are no non-linear nodes in the detected target area.

[0116] Specifically, after step S1A is completed, it is confirmed whether the second harmonic signal and the third harmonic signal are obtained simultaneously. If so, the above step S21 is continued. If not, the above step S3 is executed.

[0117] Because when there are targets (including true nodes and false nodes) in the detected target area, the second harmonic signal and the third harmonic signal radiated by the targets can be detected. If during the detection of the detected target area by the detection device, the second harmonic signal and the third harmonic signal corresponding to the fundamental wave signal cannot be detected simultaneously, it means that there are no targets in the detected target area, and naturally there are no non-linear nodes. That is, there is no need to execute the further step of determining whether there are non-linear nodes. Briefly understood, when it can be confirmed that there are no targets in the detected target area, the determination result that there are no non-linear nodes in the detected target area can be directly obtained.

[0118] It should be noted that in all the above embodiments, the execution subject of the judgment step can be a person. For example, the user can distinguish true and false nodes according to the different characteristics of true and false nodes reflected in the time domain curve, and determine whether there are non-linear nodes in the detected target area. For the convenience of the user and to improve efficiency, the execution subject of all judgment steps can also be a judgment device in the detection device, such as a processor. And after the processor executes the above judgment steps, the corresponding judgment result can be obtained, and the judgment result can be intuitively provided for the user's reference through a display interface or a prompt component. In some embodiments, among all the above judgment steps, after the judgment result (that is, whether there are non-linear nodes in the detected target area) is obtained, according to the unstable characteristics of the above false nodes reflected in the time domain curve, it is judged whether the target is a false node. For example, when it is judged that the target is a false node, the judgment result can be provided for the user's reference through a display interface or a prompt component. At this time, the judgment result can include a non-linear node alarm result, being detected (no alarm result), and a metal node alarm result.

[0119] In addition, in a non-linear node determination device provided by an embodiment of the present invention, it includes a memory and a processor; the memory is used to store a computer program; the processor is used to execute the computer program such as the above method. Specifically, according to the embodiment of the present invention, the process described with reference to the flowchart above can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program codes for executing the method shown in the flowchart. In such an embodiment, when the computer program is downloaded and installed by an electronic device and executed, it executes the above functions defined in the method of the embodiment of the present invention. The non-linear node determination device in the present invention can be a terminal such as a notebook, a desktop computer, a tablet computer, a smart phone, etc., or a server.

[0120] In addition, in an embodiment of a computer storage medium proposed by the present invention, a computer program is stored thereon, and when the computer program is executed by a processor, it implements the method of any one of the above. Specifically, it should be noted that the above computer-readable medium of the present invention can be a computer-readable signal medium or a computer-readable storage medium or any combination of the two. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of the computer-readable storage medium can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In an embodiment of the present invention, the computer-readable storage medium can be any tangible medium that contains or stores a program, and the program can be used by or in combination with an instruction execution system, apparatus, or device. In an embodiment of the present invention, the computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, which carries computer-readable program codes. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The computer-readable signal medium can also be any computer-readable medium other than the computer-readable storage medium, and the computer-readable signal medium can send, propagate, or transmit a program for use by or in combination with an instruction execution system, apparatus, or device. The program codes contained on the computer-readable medium can be transmitted by any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0121] The above computer-readable medium may be included in the above electronic device, or may exist separately without being assembled into the electronic device.

[0122] In addition, an embodiment of the present invention further provides a non-linear node detection device, including the above non-linear node determination device. That is, the above non-linear node determination device can be added based on a general non-linear node detection device so that when non-linear node detection is performed by the non-linear node detection device, the detection result can be directly output. Among them, as Figure 11 shown, the non-linear node detection device may include a transmitting antenna 10, a receiving antenna 20, a non-linear detection circuit 30, a main control board 40, and a display screen 50. The non-linear detection circuit 30 is configured to transmit a fundamental wave signal f0 through the transmitting antenna 10, and receive a second harmonic signal 2f0 and a third harmonic signal 3f0 radiated by the target through the receiving antenna 20. The non-linear detection circuit 30 can perform corresponding processing on the second harmonic signal 2f0 and the third harmonic signal 3f0, such as mixing processing, detection processing, analog-to-digital conversion processing, etc., and input the processed signal to the main control board 40. The main control board 40 can display the time-domain curves of the second harmonic signal 2f0 and the third harmonic signal 3f0 on the display screen 50 according to the signal. At the same time, the non-linear node can also be determined according to the time-domain curves of the second harmonic signal 2f0 and the third harmonic signal 3f0. Alternatively, an alarm result (such as including a non-linear node alarm result and a metal node alarm result) can also be displayed on the display screen 50, and whether there is a non-linear node is judged according to the status of the alarm result.

[0123] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A method for judging a non-linear node, characterized in that, The non-linear node determination method includes the following steps: Obtain the harmonic signals radiated by the target object within the detected target area; Determine whether there are non-linear nodes in the detected target area based on the state change of the harmonic signals.

2. The non-linear node determination method according to claim 1, wherein The step of determining whether there are non-linear nodes in the detected target area based on the state change of the harmonic signals includes: Generate a corresponding time-domain curve based on the harmonic signals to determine whether there are non-linear nodes in the detected target area based on the time-domain curve.

3. The non-linear node determination method according to claim 2, characterized in that, The harmonic signals include second-harmonic signals and third-harmonic signals corresponding to the fundamental wave signal; The step of generating a corresponding time-domain curve based on the harmonic signals to determine whether there are non-linear nodes in the detected target area based on the time-domain curve includes: When both the second-harmonic signal and the third-harmonic signal are obtained simultaneously, generate a second-order time-domain curve corresponding to the second-harmonic signal and a third-order time-domain curve corresponding to the third-harmonic signal respectively, to determine whether there are non-linear nodes in the detected target area according to the second-order time-domain curve and the third-order time-domain curve.

4. The non-linear node determination method according to claim 3, characterized in that, The step of determining whether there are non-linear nodes in the detected target area according to the second-order time-domain curve and the third-order time-domain curve includes: Obtain the rising-section curves in the second-order time-domain curve and the third-order time-domain curve, and determine whether there are non-linear nodes in the detected target area according to the rising-section curves.

5. The non-linear node determination method according to claim 4, characterized in that, The step of determining whether there are non-linear nodes in the detected target area according to the rising-section curves includes: When the slopes of the rising-section curves in the second-order time-domain curve are all greater than zero within the first preset time, the slopes of the rising-section curves in the third-order time-domain curve are all greater than zero within the first preset time, and the amplitude of the rising-section curve of the second-order time-domain curve is greater than the amplitude of the third-order time-domain curve at any moment, determine that there are non-linear nodes in the detected target area.

6. The non-linear node determination method according to claim 3, wherein The step of obtaining the harmonic signals radiated by the target object within the detected target area includes: Obtain the first second-harmonic signal and the first third-harmonic signal radiated by the target object when the detected target area is in a vibrating state; The step of, when both the second-harmonic signal and the third-harmonic signal are obtained simultaneously, generating a second-order time-domain curve corresponding to the second-harmonic signal and a third-order time-domain curve corresponding to the third-harmonic signal respectively, to determine whether there are non-linear nodes in the detected target area according to the second-order time-domain curve and the third-order time-domain curve includes: When both the first second-harmonic signal and the first third-harmonic signal are obtained simultaneously, generate a first second-order time-domain curve corresponding to the first second-harmonic signal and a first third-order time-domain curve corresponding to the first third-harmonic signal respectively, to determine whether there are non-linear nodes in the detected target area based on the first second-order time-domain curve and the first third-order time-domain curve.

7. The non-linear node determination method according to claim 6, characterized in that The step of determining whether there are non-linear nodes in the detected target area based on the first second-order time-domain curve and the first third-order time-domain curve includes: When the difference between the maximum value and the minimum value of the amplitude within the second preset time in the first second-order time-domain curve is less than the first preset value, and the difference between the maximum value and the minimum value of the amplitude within the second preset time in the first third-order time-domain curve is less than the second preset value, and the amplitude of the first second-order time-domain curve is greater than the amplitude of the first third-order time-domain curve at any moment, it is determined that there is a non-linear node in the detected target area; Otherwise, it is determined that there is no non-linear node in the detected target area.

8. The non-linear node determination method according to claim 7, wherein, The first preset value is less than or equal to 100 mv; and / or, the second preset value is less than or equal to 100 mv.

9. The method for judging non-linear nodes according to claim 3, wherein The step of obtaining the harmonic signal radiated by the target in the detected target area includes: Obtaining the second second-harmonic signal and the second third-harmonic signal radiated by the target in the detected target area when the fundamental signal source shakes; When the second-harmonic signal and the third-harmonic signal are obtained simultaneously, the step of respectively generating a second-order time-domain curve corresponding to the second-harmonic signal and a third-order time-domain curve corresponding to the third-harmonic signal to determine whether there is a non-linear node in the detected target area according to the second-order time-domain curve and the third-order time-domain curve includes: When the second second-harmonic signal and the second third-harmonic signal are obtained simultaneously, respectively generate a second second-order time-domain curve corresponding to the second second-harmonic signal and a second third-order time-domain curve corresponding to the second third-harmonic signal, and determine whether there is a non-linear node in the detected target area based on the second second-order time-domain curve and the second third-order time-domain curve.

10. The non-linear node determination method according to claim 9, wherein Determining whether there is a non-linear node in the detected target area based on the second second-order time-domain curve and the second third-order time-domain curve; includes: When the difference between the maximum value and the minimum value of the amplitude within the third preset time in the second second-order time-domain curve is less than the third preset value, the difference between the maximum value and the minimum value of the amplitude within the third preset time in the second third-order time-domain curve is less than the fourth preset value, and the amplitude of the second second-order time-domain curve is greater than the amplitude of the second third-order time-domain curve, it is determined that there is a non-linear node in the detected target area; Otherwise, it is determined that there is no non-linear node in the detected target area.

11. The non-linear node determination method according to claim 1, characterized in that The step of determining whether there is a non-linear node in the detected target area based on the state change of the harmonic signal includes: Generating an alarm result based on the harmonic signal, and determining whether there is a non-linear node in the detected target area based on the state change of the alarm result.

12. The non-linear node determination method according to claim 3, characterized in that, The method further includes: If the second-harmonic signal and the third-harmonic signal cannot be obtained simultaneously, it is determined that there is no non-linear node in the detected target area.

13. A non-linear node determination device, characterized in that, Including a memory and a processor; The memory is used to store a computer program; The processor is used to execute the computer program to implement the method according to any one of claims 1 to 12.

14. A computer storage medium, on which a computer program is stored, characterized in that, When the computer program is executed by the processor, the method according to any one of claims 1 to 12 is implemented.

15. A non-linear node detection device, characterized in that, Including the non-linear node judgment device according to claim 13.

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