CN117538941A - Portable nonlinear node detection equipment and detection flow - Google Patents
Portable nonlinear node detection equipment and detection flow Download PDFInfo
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Abstract
A portable nonlinear node detection device and a detection flow thereof relate to the field of security protection and explosion prevention detection, in particular to an improvement of a nonlinear node detection technology. The novel power supply comprises a main controller MCU, keys, a display, a fundamental wave transmitting circuit, a 2-order harmonic wave receiving circuit, a 3-order harmonic wave receiving circuit and a power supply, wherein the information input end of the main controller MCU is connected with the keys, the information output end of the main controller MCU is connected with the display, the control signal input and output end of the main controller MCU is respectively connected with the fundamental wave transmitting circuit, the 2-order harmonic wave receiving circuit and the 3-order harmonic wave receiving circuit, and the output end of the power supply is connected with the main controller MCU and the display. The method can solve the contradiction problem between the sensitivity and the false alarm rate of the existing detection equipment, can greatly improve the performance of the detection equipment, can reduce the false alarm rate while improving the sensitivity, and expands the application range of the nonlinear node detection equipment.
Description
Technical Field
The invention relates to the field of security protection and explosion prevention detection, in particular to an improvement of a nonlinear node detection technology.
Background
The principle of the nonlinear detector is that most targets in nature are linear, namely, no new frequency component is generated after electromagnetic wave irradiation; conversely, if a harmonic frequency is generated after the object is illuminated, it is indicative of a non-linear object. While nonlinear targets can be broadly divided into two categories: the first type is a semiconductor target containing a PN junction, and the second type is a detector containing a metal junction. The formation of metal nodes is mainly composed of two different metals or contact points formed by metals and metal oxides thereof, and PN junctions and metal nodes are collectively called nonlinear nodes. The traditional basis for discrimination of a nonlinear detector is by observing the intensity of the received harmonic points. Such as early single-frequency single-phase metal detectors, which can judge whether a metal object exists or not by observing the intensity of the third harmonic. The subsequent single-frequency and double-phase electronic device detects, and judges whether the detection target is common metal or an electronic device by comparing and analyzing the intensity of the second harmonic and the third harmonic.
Therefore, the method is simple to operate, but a certain false alarm risk exists. If the set decision threshold is high, the sensitivity of the device is reduced; if the set threshold is low, the false alarm rate of the device increases, and a nonlinear node detection device is currently lacking.
Disclosure of Invention
Aiming at the defects and the shortcomings of the prior art, the invention provides portable nonlinear node detection equipment and a detection flow, which can solve the contradiction problem between the sensitivity and the false alarm rate of the existing detection equipment, greatly improve the performance of the detection equipment, reduce the false alarm rate while improving the sensitivity, and expand the application range of the nonlinear node detection equipment.
In order to achieve the above purpose, the invention adopts the following technical scheme: the utility model provides a portable nonlinear node check out test set, it contains main control unit MCU1, button 2, display 3, fundamental wave transmitting circuit A1, 2 subharmonic receiving circuit A2, 3 subharmonic receiving circuit A3, power 16, button 2 is connected to main control unit MCU 1's information input end, display 3 is connected to main control unit MCU 1's information output end, fundamental wave transmitting circuit A1, 2 subharmonic receiving circuit A2 and 3 subharmonic receiving circuit A3 are connected respectively to main control unit MCU 1's control signal input output end, power 16's output is connected main control unit MCU1 and display 3.
The fundamental wave transmitting circuit A1 comprises a PLL fundamental wave local oscillator 4, a fundamental wave mixer 5, a power amplifier 6, a first filter 7 and a fundamental wave transmitting antenna 8, wherein the PLL fundamental wave local oscillator 4, the fundamental wave mixer 5, the power amplifier 6, the first filter 7 and the fundamental wave transmitting antenna 8 are electrically connected in sequence, and a signal input end of the fundamental wave mixer 5 is connected with the main controller MCU1.
The 2 nd harmonic receiving circuit A2 comprises a PLL2 nd harmonic local oscillator 14, A2 nd harmonic mixer 13, a first LNA12, a second filter 11 and A2 nd harmonic receiving antenna 9, wherein the PLL2 nd harmonic local oscillator 14, the 2 nd harmonic mixer 13, the first LNA12, the second filter 11 and the 2 nd harmonic receiving antenna 9 are electrically connected in sequence, and a signal input end of the 2 nd harmonic mixer 13 is connected with the main controller MCU1.
The 3 rd harmonic receiving circuit A3 comprises a PLL3 rd harmonic local oscillator 17, A3 rd harmonic mixer 18, a second LNA19, a third filter 15 and A3 rd harmonic receiving antenna 10, wherein the PLL3 rd harmonic local oscillator 17, the 3 rd harmonic mixer 18, the second LNA19, the third filter 15 and the 3 rd harmonic receiving antenna 10 are electrically connected in sequence, and a signal input end of the 3 rd harmonic mixer 18 is connected with the main controller MCU1.
A portable nonlinear node detection process includes: step 1 includes a first detection time slot 20 and a first empty time slot 21, the detection time slot 20 uses T1 as a time period, uses P1 as radio frequency output power, and detects 2 nd harmonic signals and 3 rd harmonic signals generated by nonlinear nodes at the same time; the empty time slot 21 takes T2 as a time period, and the radio frequency output power is 0, so as to detect the noise level corresponding to the 2 nd harmonic signal and the 3 rd harmonic signal in the environment; step 2 includes a second detection time slot 22 and a second empty time slot 23, wherein the second detection time slot 22 uses 2 times of T1 as a time period and 2 times of P1 as radio frequency output power, and simultaneously detects a2 nd harmonic signal and a3 rd harmonic signal generated by a nonlinear node; the empty time slot 23 takes 2 times of T2 as a time period, and the radio frequency output power is 0, so as to detect the signal noise level of 2 nd harmonic waves and 3 rd harmonic waves in the environment; step 3 includes a third detecting time slot 24 and a third empty time slot 25, wherein the third detecting time slot 24 uses 2 times of T1 as a time period and 2 times of P1 as radio frequency output power, and simultaneously detects a2 nd harmonic signal and a3 rd harmonic signal generated by a nonlinear node; the third empty slot 25 has a time period of 2 times T2 and a radio frequency output power of 0 for detecting the signal noise levels of the 2 nd and 3 rd harmonics in the environment.
T1 is set to be 50-100 milliseconds, T2 is set to be 30-50 milliseconds, and P1 is set to be 1-3W; t1, T2 and P1 are adjusted according to the ambient noise level and the real-time nature of the detection.
And (3) respectively detecting the 2 nd harmonic signal intensity and the 3 rd harmonic signal intensity in the step (1), the step (2) and the step (3), and according to the detected 2 nd harmonic and 3 rd harmonic model intensity relation, making corresponding judgment on the nonlinear node. Therefore, the contradiction between sensitivity and false alarm rate can be effectively balanced, the performance of the nonlinear node detection equipment is effectively improved, and the application range of the nonlinear node detection equipment is expanded.
The main controller MCU1 is used as a system control center and is used for controlling a fundamental wave transmitting circuit, a2 nd harmonic wave detecting circuit, a3 rd harmonic wave detecting circuit, keys and a display part. The power supply 16 provides various types of power supplies to all devices, including voltage levels of +9v, +5v, +3.3v, and 1.8V.
The key 2 is used for setting the sensitivity, detection time, radio frequency emission power and the like of the equipment. The display (2) is used for displaying the 2 nd harmonic intensity, the 3 rd harmonic signal intensity, the node judgment result and the probability value corresponding to the node judgment result generated in each step and is used for manual auxiliary judgment.
The PLL fundamental wave local oscillator 4 is used for generating a radio frequency local oscillator signal, the frequency of the local oscillator signal can be changed within the range of 500MHz-5GHz, and the local oscillator signal frequency selection principle is to avoid the radio frequency used daily by people as much as possible so as to reduce the possibility of interference of a detection result; the fundamental wave mixer 5 is used for carrying out mixing processing on the modulated signal and the PLL fundamental wave signal, and the modulated signal generated by the mixer is used for driving the power amplifier 6; the power amplifier 6 is used for amplifying the power of the front-stage low-power radio frequency signal to generate radio frequency power of more than 5W, and the radio frequency power level can be adjusted by software; because the power amplifier generates signal distortion so as to generate a higher harmonic signal, the higher harmonic signal can generate great interference to the 2 nd harmonic and 3 rd harmonic detection circuit at the rear stage, so that the radio frequency power signal is required to be input into the first filter 7 for filtering treatment, and the first filter 7 carries out frequency selection filtering on the power signal so as to ensure the spectral purity of the transmitted fundamental wave power signal and eliminate the higher harmonic generated by the power amplifier 6; finally, the radio frequency power signal is transmitted to the object to be detected through the fundamental wave transmitting antenna 8.
The 2 nd harmonic receiving antenna 9 is used for receiving the 2 nd harmonic signal generated by the nonlinear node, and the received 2 nd harmonic signal firstly filters the input signal by the second filter 11 to filter out the non-2 nd harmonic signal; since the 2 nd harmonic signal generated by the nonlinear node is very weak, the low noise amplifier first LNA12 is required to amplify the signal, and the gain of the first LNA12 is generally set to be above 40 dB; the amplified 2 nd harmonic signal is mixed with the 2 nd harmonic local oscillator 14 signal through the 2 nd harmonic mixer 13, and a2 nd harmonic signal intensity signal is generated. The method comprises the steps of sampling a2 nd harmonic signal in real time by adopting an analog-to-digital converter ADC, and carrying out digital signal processing on the acquired signal, wherein the digital signal processing process comprises digital filtering FIR, root mean square calculation and data calibration, so that the corresponding 2 nd harmonic signal intensity can be restored. By adopting the same process, the 3 rd harmonic signal intensity can be obtained.
The working principle of the invention is as follows: the inherent physical characteristics of the nonlinear node are utilized, and when an excitation radio frequency signal reaches the nonlinear node, 2-order harmonic signals and 3-order harmonic signals are generated; therefore, the main controller MCU1 controls the fundamental wave transmitting circuit to transmit an excitation radio frequency signal, and corresponding judgment can be made on the nonlinear node according to the detected model intensity relation of the 2 nd harmonic and the 3 rd harmonic.
After the technical scheme is adopted, the invention has the beneficial effects that: the method can solve the contradiction problem between the sensitivity and the false alarm rate of the existing detection equipment, can greatly improve the performance of the detection equipment, can reduce the false alarm rate while improving the sensitivity, and expands the application range of the nonlinear node detection equipment.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic block diagram of the circuit configuration of the present invention;
fig. 2 is a detection flow chart of the present invention.
Reference numerals illustrate: the device comprises a main controller MCU1, a key 2, a display 3, a fundamental wave transmitting circuit A1, A2 nd harmonic receiving circuit A2, A3 rd harmonic receiving circuit A3, a power supply 16, a PLL fundamental wave local oscillator 4, a fundamental wave mixer 5, a power amplifier 6, a first filter 7, a fundamental wave transmitting antenna 8, a PLL2 nd harmonic local oscillator 14, A2 nd harmonic mixer 13, a first LNA12, a second filter 11, A2 nd harmonic receiving antenna 9, a PLL3 rd harmonic local oscillator 17, A3 rd harmonic mixer 18, a second LNA19, a third filter 15, A3 rd harmonic receiving antenna 10, a first detection time slot 20, a first empty time slot 21, a second detection time slot 22, a second empty time slot 23, a third detection time slot 24 and a third empty time slot 25.
Detailed Description
Referring to fig. 1-2, the technical scheme adopted in the specific embodiment is as follows: the novel power supply comprises a main controller MCU1, a key 2, a display 3, a fundamental wave transmitting circuit A1, A2 nd harmonic wave receiving circuit A2, A3 rd harmonic wave receiving circuit A3 and a power supply 16, wherein an information input end of the main controller MCU1 is connected with the key 2, an information output end of the main controller MCU1 is connected with the display 3, a control signal input end of the main controller MCU1 is respectively connected with the fundamental wave transmitting circuit A1, the 2 nd harmonic wave receiving circuit A2 and the 3 rd harmonic wave receiving circuit A3, and an output end of the power supply 16 is connected with the main controller MCU1 and the display 3. The fundamental wave transmitting circuit A1 comprises a PLL fundamental wave local oscillator 4, a fundamental wave mixer 5, a power amplifier 6, a first filter 7 and a fundamental wave transmitting antenna 8, wherein the PLL fundamental wave local oscillator 4, the fundamental wave mixer 5, the power amplifier 6, the first filter 7 and the fundamental wave transmitting antenna 8 are electrically connected in sequence, and a signal input end of the fundamental wave mixer 5 is connected with the main controller MCU1. The 2 nd harmonic receiving circuit A2 comprises a PLL2 nd harmonic local oscillator 14, A2 nd harmonic mixer 13, a first LNA12, a second filter 11 and A2 nd harmonic receiving antenna 9, wherein the PLL2 nd harmonic local oscillator 14, the 2 nd harmonic mixer 13, the first LNA12, the second filter 11 and the 2 nd harmonic receiving antenna 9 are electrically connected in sequence, and a signal input end of the 2 nd harmonic mixer 13 is connected with the main controller MCU1. The 3 rd harmonic receiving circuit A3 comprises a PLL3 rd harmonic local oscillator 17, A3 rd harmonic mixer 18, a second LNA19, a third filter 15 and A3 rd harmonic receiving antenna 10, wherein the PLL3 rd harmonic local oscillator 17, the 3 rd harmonic mixer 18, the second LNA19, the third filter 15 and the 3 rd harmonic receiving antenna 10 are electrically connected in sequence, and a signal input end of the 3 rd harmonic mixer 18 is connected with the main controller MCU1.
The main controller MCU1 is used as a system control center for controlling a fundamental wave transmitting circuit, a2 nd harmonic wave detecting circuit, a3 rd harmonic wave detecting circuit, keys and a display part. The power supply 16 provides various types of power supplies to all devices, including voltage levels of +9v, +5v, +3.3v, and 1.8V. The key 2 is used for setting the sensitivity, detection time, radio frequency emission power and the like of the equipment. The display (2) is used for displaying the 2 nd harmonic intensity, the 3 rd harmonic signal intensity, the node judgment result and the probability value corresponding to the node judgment result generated in each step and is used for manual auxiliary judgment.
The detection flow comprises: step 1 includes a first detection time slot 20 and a first empty time slot 21, the detection time slot 20 uses T1 as a time period, uses P1 as radio frequency output power, and detects 2 nd harmonic signals and 3 rd harmonic signals generated by nonlinear nodes at the same time; the empty time slot 21 takes T2 as a time period, and the radio frequency output power is 0, so as to detect the noise level corresponding to the 2 nd harmonic signal and the 3 rd harmonic signal in the environment; step 2 includes a second detection time slot 22 and a second empty time slot 23, wherein the second detection time slot 22 uses 2 times of T1 as a time period and 2 times of P1 as radio frequency output power, and simultaneously detects a2 nd harmonic signal and a3 rd harmonic signal generated by a nonlinear node; the empty time slot 23 takes 2 times of T2 as a time period, and the radio frequency output power is 0, so as to detect the signal noise level of 2 nd harmonic waves and 3 rd harmonic waves in the environment; step 3 includes a third detecting time slot 24 and a third empty time slot 25, wherein the third detecting time slot 24 uses 2 times of T1 as a time period and 2 times of P1 as radio frequency output power, and simultaneously detects a2 nd harmonic signal and a3 rd harmonic signal generated by a nonlinear node; the third empty slot 25 has a time period of 2 times T2 and a radio frequency output power of 0 for detecting the signal noise levels of the 2 nd and 3 rd harmonics in the environment.
T1 is set to be 50-100 milliseconds, T2 is set to be 30-50 milliseconds, and P1 is set to be 1-3W; t1, T2 and P1 are adjusted according to the ambient noise level and the real-time nature of the detection.
And (3) respectively detecting the 2 nd harmonic signal intensity and the 3 rd harmonic signal intensity in the step (1), the step (2) and the step (3), and according to the detected 2 nd harmonic and 3 rd harmonic model intensity relation, making corresponding judgment on the nonlinear node. Therefore, the contradiction between sensitivity and false alarm rate can be effectively balanced, the performance of the nonlinear node detection equipment is effectively improved, and the application range of the nonlinear node detection equipment is expanded.
The PLL fundamental wave local oscillator 4 is used for generating a radio frequency local oscillator signal, the frequency of the local oscillator signal can be changed within the range of 500MHz-5GHz, and the local oscillator signal frequency selection principle is to avoid the radio frequency used daily by people as much as possible so as to reduce the possibility of interference of a detection result; the fundamental wave mixer 5 is used for carrying out mixing processing on the modulated signal and the PLL fundamental wave signal, and the modulated signal generated by the mixer is used for driving the power amplifier 6; the power amplifier 6 is used for amplifying the power of the front-stage low-power radio frequency signal to generate radio frequency power of more than 5W, and the radio frequency power level can be adjusted by software; because the power amplifier generates signal distortion so as to generate a higher harmonic signal, the higher harmonic signal can generate great interference to the 2 nd harmonic and 3 rd harmonic detection circuit at the rear stage, so that the radio frequency power signal is required to be input into the first filter 7 for filtering treatment, and the first filter 7 carries out frequency selection filtering on the power signal so as to ensure the spectral purity of the transmitted fundamental wave power signal and eliminate the higher harmonic generated by the power amplifier 6; finally, the radio frequency power signal is transmitted to the object to be detected through the fundamental wave transmitting antenna 8.
The 2 nd harmonic receiving antenna 9 is used for receiving the 2 nd harmonic signal generated by the nonlinear node, and the received 2 nd harmonic signal firstly filters the input signal by the second filter 11 to filter out the non-2 nd harmonic signal; since the 2 nd harmonic signal generated by the nonlinear node is very weak, the low noise amplifier first LNA12 is required to amplify the signal, and the gain of the first LNA12 is generally set to be above 40 dB; the amplified 2 nd harmonic signal is mixed with the 2 nd harmonic local oscillator 14 signal through the 2 nd harmonic mixer 13, and a2 nd harmonic signal intensity signal is generated. The method comprises the steps of sampling a2 nd harmonic signal in real time by adopting an analog-to-digital converter ADC, and carrying out digital signal processing on the acquired signal, wherein the digital signal processing process comprises digital filtering FIR, root mean square calculation and data calibration, so that the corresponding 2 nd harmonic signal intensity can be restored. By adopting the same process, the 3 rd harmonic signal intensity can be obtained.
The inherent physical characteristics of the nonlinear node are utilized, and when an excitation radio frequency signal reaches the nonlinear node, 2-order harmonic signals and 3-order harmonic signals are generated; therefore, the main controller MCU1 controls the fundamental wave transmitting circuit to transmit an excitation radio frequency signal, and corresponding judgment can be made on the nonlinear node according to the detected model intensity relation of the 2 nd harmonic and the 3 rd harmonic.
After the technical scheme is adopted, the invention has the beneficial effects that: the method can solve the contradiction problem between the sensitivity and the false alarm rate of the existing detection equipment, can greatly improve the performance of the detection equipment, can reduce the false alarm rate while improving the sensitivity, and expands the application range of the nonlinear node detection equipment.
The foregoing is merely illustrative of the present invention and not restrictive, and other modifications and equivalents thereof may occur to those skilled in the art without departing from the spirit and scope of the present invention.
Claims (7)
1. A portable nonlinear node detection apparatus, characterized by: the novel power supply comprises a main controller (MCU 1), keys (2), a display (3), a fundamental wave transmitting circuit (A1), A2 nd harmonic wave receiving circuit (A2), A3 rd harmonic wave receiving circuit (A3) and a power supply (16), wherein the keys (2) are connected with the information input end of the main controller (MCU 1), the information output end of the main controller (MCU 1) is connected with the display (3), the control signal input and output end of the main controller (MCU 1) is respectively connected with the fundamental wave transmitting circuit (A1), the 2 nd harmonic wave receiving circuit (A2) and the 3 rd harmonic wave receiving circuit (A3), and the output end of the power supply (16) is connected with the main controller (MCU 1) and the display (3).
2. A portable nonlinear node detection apparatus in accordance with claim 1, wherein: the fundamental wave transmitting circuit (A1) comprises a PLL fundamental wave local oscillator (4), a fundamental wave mixer (5), a power amplifier (6), a first filter (7) and a fundamental wave transmitting antenna (8), wherein the PLL fundamental wave local oscillator (4), the fundamental wave mixer (5), the power amplifier (6), the first filter (7) and the fundamental wave transmitting antenna (8) are electrically connected in sequence, and a signal input end of the fundamental wave mixer (5) is connected with the main controller (MCU 1).
3. A portable nonlinear node detection apparatus in accordance with claim 1, wherein: the 2 nd harmonic receiving circuit (A2) comprises a PLL2 nd harmonic local oscillator (14), A2 nd harmonic mixer (13), a first LNA (12), a second filter (11) and A2 nd harmonic receiving antenna (9), wherein the PLL2 nd harmonic local oscillator (14, the 2 nd harmonic mixer (13), the first LNA (12), the second filter (11) and the 2 nd harmonic receiving antenna (9) are electrically connected in sequence, and a signal input end of the 2 nd harmonic mixer (13) is connected with a main controller (MCU 1).
4. A portable nonlinear node detection apparatus in accordance with claim 1, wherein: the 3 rd harmonic receiving circuit (A3) comprises a PLL3 rd harmonic local oscillator (17), A3 rd harmonic mixer (18), a second LNA (19), a third filter (15) and A3 rd harmonic receiving antenna (10), wherein the PLL3 rd harmonic local oscillator (17), the 3 rd harmonic mixer (18), the second LNA (19), the third filter (15) and the 3 rd harmonic receiving antenna (10) are electrically connected in sequence, and a signal input end of the 3 rd harmonic mixer (18) is connected with a main controller (MCU 1).
5. The portable nonlinear node detection process is characterized in that: the method comprises the following steps: step 1 comprises a first detection time slot (20) and a first empty time slot (21), step 1 comprises the first detection time slot (20) and the first empty time slot (21), the detection time slot (20) takes T1 as a time period, takes P1 as radio frequency output power, and simultaneously detects a2 nd harmonic signal and a3 rd harmonic signal generated by a nonlinear node; the empty time slot (21) takes T2 as a time period, the radio frequency output power is 0, and the radio frequency output power is used for detecting the noise level corresponding to the 2 nd harmonic signal and the 3 rd harmonic signal in the environment; step 2 includes a second detection time slot ((23)) and a second empty time slot 23, wherein the second detection time slot ((23)) takes 2 times of T1 as a time period and 2 times of P1 as radio frequency output power, and simultaneously detects a2 nd harmonic signal and a3 rd harmonic signal generated by a nonlinear node; the empty time slot 23 takes 2 times of T2 as a time period, and the radio frequency output power is 0, so as to detect the signal noise level of 2 nd harmonic waves and 3 rd harmonic waves in the environment; step 3 includes a third detection time slot (24) and a third empty time slot (25), wherein the third detection time slot (24) uses 2 times of T1 as a time period and 2 times of P1 as radio frequency output power, and simultaneously detects a2 nd harmonic signal and a3 rd harmonic signal generated by a nonlinear node; the third empty slot (25) has a time period of 2 times T2 and a radio frequency output power of 0, and is used for detecting the signal noise level of the 2 nd harmonic wave and the 3 rd harmonic wave in the environment.
6. The portable nonlinear node detection process of claim 5, wherein: t1 is set to be 50-100 milliseconds, T2 is set to be 30-50 milliseconds, and P1 is set to be 1-3W; t1, T2 and P1 are adjusted according to the ambient noise level and the real-time nature of the detection.
7. The portable nonlinear node detection process of claim 5, wherein: and (3) respectively detecting the 2 nd harmonic signal intensity and the 3 rd harmonic signal intensity in the step (1), the step (2) and the step (3), and according to the detected 2 nd harmonic and 3 rd harmonic model intensity relation, making corresponding judgment on the nonlinear node.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202311556650.XA CN117538941A (en) | 2023-11-21 | 2023-11-21 | Portable nonlinear node detection equipment and detection flow |
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| CN202311556650.XA CN117538941A (en) | 2023-11-21 | 2023-11-21 | Portable nonlinear node detection equipment and detection flow |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117784262A (en) * | 2024-02-23 | 2024-03-29 | 深圳市安卫普科技有限公司 | Nonlinear node detection circuit and detection device |
| CN117784262B (en) * | 2024-02-23 | 2024-05-10 | 深圳市安卫普科技有限公司 | Nonlinear node detection circuit and detection device |
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2023
- 2023-11-21 CN CN202311556650.XA patent/CN117538941A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117784262A (en) * | 2024-02-23 | 2024-03-29 | 深圳市安卫普科技有限公司 | Nonlinear node detection circuit and detection device |
| CN117784262B (en) * | 2024-02-23 | 2024-05-10 | 深圳市安卫普科技有限公司 | Nonlinear node detection circuit and detection device |
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