CN111637794A - Underground unexplosive bomb frequency domain detection device and method based on vertical coupling coil - Google Patents
Underground unexplosive bomb frequency domain detection device and method based on vertical coupling coil Download PDFInfo
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- CN111637794A CN111637794A CN202010512959.9A CN202010512959A CN111637794A CN 111637794 A CN111637794 A CN 111637794A CN 202010512959 A CN202010512959 A CN 202010512959A CN 111637794 A CN111637794 A CN 111637794A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
- F41H11/00—Defence installations; Defence devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
- F41H11/00—Defence installations; Defence devices
- F41H11/12—Means for clearing land minefields; Systems specially adapted for detection of landmines
- F41H11/13—Systems specially adapted for detection of landmines
- F41H11/136—Magnetic, electromagnetic, acoustic or radiation systems, e.g. ground penetrating radars or metal-detectors
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Abstract
The invention relates to an underground unexplosive bomb detection technology, in particular to an underground unexplosive bomb frequency domain detection device and method based on a vertical coupling coil. The invention solves the problems of low detection rate and high detection cost of the traditional underground unexplosive bomb detection technology. An underground unexplosive bomb frequency domain detection device based on a vertical coupling coil comprises a sensing device and a detection system; the sensing device comprises a coil framework, a rectangular exciting coil and a rectangular induction coil; the detection system comprises an FPGA chip, a digital-to-analog converter, a power amplifier, a multiplexer, a program control amplifier, an analog-to-digital converter, a first storage, a second storage, a USB interface chip and an upper computer. The invention is suitable for detecting the underground unexploded bomb.
Description
Technical Field
The invention relates to an underground unexplosive bomb detection technology, in particular to an underground unexplosive bomb frequency domain detection device and method based on a vertical coupling coil.
Background
The underground unexploded ammunition left in the war or weapon test has the characteristics of various types, complex distribution condition and high risk, which not only seriously hinders the development and utilization of the land, but also seriously threatens the life and property safety of people. Therefore, in order to promote the development and utilization of the land and ensure the life and property safety of the people, the underground unexploded bomb needs to be detected. According to the traditional underground unexplosive detection technology, a time domain detection principle is adopted (a periodic pulse excitation magnetic field is applied to a target area, and then detection is realized by collecting attenuation information of a secondary response magnetic field during the turn-off period of the excitation magnetic field), so that the problem of insufficient detection depth exists on one hand, and the problem of high power consumption exists on the other hand, so that the detection rate is low on the one hand, and the detection cost is high on the other hand. Based on the above, it is necessary to invent a device and a method for detecting an underground unexplosive frequency domain based on a vertical coupling coil, so as to solve the problems of low detection rate and high detection cost of the traditional underground unexplosive detection technology.
Disclosure of Invention
The invention provides an underground unexplosive frequency domain detection device and method based on a vertical coupling coil, and aims to solve the problems of low detection rate and high detection cost of the traditional underground unexplosive detection technology.
The invention is realized by adopting the following technical scheme:
an underground unexplosive bomb frequency domain detection device based on a vertical coupling coil comprises a sensing device and a detection system;
the sensing device comprises a coil framework, a rectangular exciting coil and a rectangular induction coil;
the rectangular excitation coil and the rectangular induction coil are wound on the coil framework, and the rectangular induction coil is positioned on the right side of the rectangular excitation coil; two long sides of the rectangular excitation coil are longitudinally arranged, and two short sides of the rectangular excitation coil are transversely arranged; two long sides of the rectangular induction coil are longitudinally arranged, and the length of the rectangular induction coil is equal to that of the rectangular excitation coil; two short sides of the rectangular induction coil are vertically arranged, and the width of the rectangular induction coil is smaller than that of the rectangular excitation coil; the central line of the rectangular induction coil is vertically intersected with the central line of the rectangular excitation coil, and the intersection point is positioned above the central point of the rectangular excitation coil;
the detection system comprises an FPGA chip, a digital-to-analog converter, a power amplifier, a multiplexer, a program-controlled amplifier, an analog-to-digital converter, a first memory, a second memory, a USB interface chip and an upper computer;
the output end of the FPGA chip is connected with the input end of the digital-to-analog converter; the output end of the digital-to-analog converter is connected with the input end of the power amplifier; the output end of the power amplifier is connected with the rectangular exciting coil through a multiplexer; the rectangular induction coil is connected with the input end of the program control amplifier through a multiplexer; the output end of the program control amplifier is connected with the input end of the analog-to-digital converter; the output end of the analog-to-digital converter is connected with the input end of the FPGA chip; the first memory, the second memory and the USB interface chip are all in bidirectional connection with the FPGA chip; the upper computer is connected with the USB interface chip in a bidirectional way.
The coil framework comprises a rectangular horizontal plate and a rectangular longitudinal vertical plate; the upper surface of the rectangular horizontal plate is provided with a plurality of first longitudinal grooves distributed at equal intervals and a plurality of transverse grooves distributed at equal intervals, and each first longitudinal groove and each transverse groove form a grid-shaped groove in a crossed manner; two long sides of the rectangular excitation coil are respectively embedded in two first longitudinal grooves, and two short sides of the rectangular excitation coil are respectively embedded in two transverse grooves; the rectangular vertical plate is fixed on the right edge of the upper surface of the rectangular horizontal plate; a plurality of second longitudinal grooves which are distributed at equal intervals and a plurality of vertical grooves which are distributed at equal intervals are formed in the left surface of the rectangular longitudinal vertical plate; each second longitudinal groove and each vertical groove form a grid-shaped groove in a crossed manner; two long sides of the rectangular induction coil are respectively embedded in two of the second longitudinal grooves, and two short sides of the rectangular induction coil are respectively embedded in two of the vertical grooves.
The rectangular excitation coil is formed by winding an enameled wire with the wire diameter of 1mm, the length of the rectangular excitation coil is 1m, the width of the rectangular excitation coil is 0.2 m-0.5 m, and the number of turns of the rectangular excitation coil is 4-6 turns; the rectangular induction coil is formed by winding an enameled wire with the wire diameter of 0.4mm, the length of the rectangular induction coil is 1m, the width of the rectangular induction coil is 0.1 m-0.15 m, and the number of turns of the rectangular induction coil is 10; the distance between the intersection point and the central point of the rectangular excitation coil is 0.02-0.04 m; the transverse distance between the rectangular induction coil and the rectangular excitation coil is 0.25-0.35 m; the FPGA chip adopts Zynq7000 series FPGA chips; and the upper computer adopts an industrial tablet computer based on LabView.
The rectangular horizontal plate and the rectangular vertical plate are both made of nylon plates with the thickness of 10 mm.
An underground unexplosive bomb frequency domain detection method based on a vertical coupling coil (the method is realized based on the underground unexplosive bomb frequency domain detection device based on the vertical coupling coil), the method is realized by adopting the following steps:
the method comprises the following steps: packaging the sensing device in a first flat box body; packaging the detection system in a second flat box body, and ensuring that a screen of the upper computer is embedded in the upper wall of the second flat box body;
step two: fixing the first flat box body on a frame of the trolley, and ensuring that two short edges of the rectangular excitation coil are parallel to the advancing direction of the trolley; fixing the second flat box body on a push rod of the trolley;
step three: determining the soil type of a target area; then, selecting an area as a reference area, ensuring that the soil type of the reference area is consistent with that of the target area, and ensuring that no metal object exists in the soil of the reference area; then, pushing the trolley into a reference area, and determining reference signals under different excitation frequencies; the specific determination process is as follows:
step 3.1: initially setting the excitation frequency of the FPGA chip in an upper computer; the excitation frequency refers to the frequency of a digital excitation signal output by the FPGA chip;
step 3.2: digital excitation signals output by the FPGA chip are sequentially loaded to the rectangular excitation coil through the digital-to-analog converter, the power amplifier and the multiplexer, so that sinusoidal excitation current is generated in the rectangular excitation coil, and the rectangular excitation coil excites a sinusoidal excitation magnetic field; under the action of the sine excitation magnetic field, sine induction current is generated in the rectangular induction coil, the rectangular induction coil outputs a sine induction voltage signal, and a coupling magnetic field is formed between the rectangular induction coil and the rectangular excitation coil; the sinusoidal induction voltage signal is transmitted to the FPGA chip through a multiplexer, a program control amplifier and an analog-to-digital converter in sequence; the FPGA chip transmits the sinusoidal induction voltage signal to a second memory for storage on one hand, and transmits the sinusoidal induction voltage signal to an upper computer for display through a USB interface chip on the other hand;
step 3.3: different settings are carried out on the excitation frequency of the FPGA chip in the upper computer, and the steps 3.2-3.3 are carried out in a circulating mode, so that sinusoidal induction voltage signals under different excitation frequencies are obtained;
step 3.4: determining sinusoidal induction voltage signals under different excitation frequencies as reference signals under different excitation frequencies;
step four: burying unexploded bombs in soil of a reference area; then, pushing the trolley to reach the position above the unexploded bomb, and carrying out frequency sweeping identification on the unexploded bomb; the specific sweep frequency identification process is as follows:
step 4.1: initially setting the excitation frequency of the FPGA chip in an upper computer;
step 4.2: digital excitation signals output by the FPGA chip are sequentially loaded to the rectangular excitation coil through the digital-to-analog converter, the power amplifier and the multiplexer, so that sinusoidal excitation current is generated in the rectangular excitation coil, and the rectangular excitation coil excites a sinusoidal excitation magnetic field; under the action of the sine excitation magnetic field, sine induction current is generated in the rectangular induction coil, the rectangular induction coil outputs a sine induction voltage signal, and a coupling magnetic field is formed between the rectangular induction coil and the rectangular excitation coil; in the process, the coupling magnetic field is cut by the unexplosive projectile and disturbed, so that a direct-current characteristic signal is superposed on the sinusoidal induction voltage signal; the sinusoidal induction voltage signal superposed with the direct-current characteristic signal is transmitted to the FPGA chip through a multiplexer, a program-controlled amplifier and an analog-to-digital converter in sequence; the FPGA chip carries out digital phase-sensitive demodulation on the sinusoidal induction voltage signal superposed with the direct-current characteristic signal, so that the direct-current characteristic signal is extracted, and then the direct-current characteristic signal is transmitted to a first memory for storage on one hand, and is transmitted to an upper computer for display and signal-to-noise ratio calculation through a USB interface chip on the other hand;
step 4.3: different settings are carried out on the excitation frequency of the FPGA chip in the upper computer, and the steps 4.2-4.3 are executed in a circulating mode, so that direct current characteristic signals under different excitation frequencies are obtained;
step five: determining the optimal excitation frequency by comparing the signal-to-noise ratio and the significance degree of the direct current characteristic signals under different excitation frequencies;
step six: optimally setting the excitation frequency of the FPGA chip in the upper computer; then, pushing the trolley to move in the target area; in the advancing process, if no metal object appears in the soil below the trolley, a sine induction voltage signal is displayed in the upper computer; if a metal object appears in the soil below the trolley, the metal object cuts the coupling magnetic field and disturbs the coupling magnetic field, so that a sine induction voltage signal displayed in the upper computer generates waveform sudden change; at the moment, whether the metal object belongs to the unexploded bomb is judged according to the sudden change condition of the waveform:
if the wave shape mutation appears as wave crest and wave trough, the metal object is not a unexploded bomb, and the trolley is continuously pushed to move;
if the waveform mutation appears as a single peak, the metal object is shown to belong to unexploded bomb; at the moment, the trolley is stopped in place, and sweep frequency identification is carried out on unexploded bombs, so that direct current characteristic signals under different excitation frequencies are obtained; then, executing the seventh step to the eighth step;
step seven: the upper computer reads the direct current characteristic signals under different excitation frequencies from the first storage, reads the reference signals under different excitation frequencies from the second storage, and performs difference on the direct current characteristic signals under different excitation frequencies and the reference signals to obtain difference signals under different excitation frequencies, so as to draw a real part spectrogram and an imaginary part spectrogram;
the real part spectrogram is a relation curve chart between the real part of the difference signal and the excitation frequency;
the imaginary part spectrogram is a relation curve graph between the imaginary part of the difference signal and the excitation frequency;
step eight: and identifying the type of the unexploded bomb according to the first peak frequency in the real part spectrogram and the second zero-crossing frequency in the imaginary part spectrogram, thereby realizing the detection of the unexploded bomb.
Compared with the traditional underground unexplosive bomb detection technology, the underground unexplosive bomb frequency domain detection device and method based on the vertical coupling coil do not adopt a time domain detection principle any more, but adopt a brand-new frequency domain detection principle (sinusoidal excitation magnetic fields with various frequencies are applied to a target area, and then detection is realized by measuring the influence of a secondary response magnetic field on mutual inductance between the rectangular induction coil and the rectangular excitation coil), so that the detection depth is effectively increased on one hand, the power consumption is effectively reduced on the other hand, the detection rate is effectively increased on the one hand, and the detection cost is effectively reduced on the other hand.
The method effectively solves the problems of low detection rate and high detection cost of the traditional underground unexplosive bomb detection technology, and is suitable for underground unexplosive bomb detection.
Drawings
FIG. 1 is a schematic diagram of the structure of the device of the present invention.
Fig. 2 is a schematic diagram of the structure of a rectangular exciting coil and a rectangular induction coil in the device of the invention.
Fig. 3 is a schematic diagram of the structure of the bobbin in the device of the present invention.
Fig. 4 is a top view of fig. 3.
Fig. 5 is a left side view of fig. 3.
FIG. 6 is a schematic diagram of step one and step two of the method of the present invention.
Fig. 7 is a graph of the real part spectrum in the method of the invention.
Fig. 8 is a graph of the imaginary part spectrum in the method of the invention.
In the figure: 101-rectangular exciting coil, 102-rectangular induction coil, 103-rectangular horizontal plate, 104-rectangular longitudinal vertical plate, 105-first longitudinal groove, 106-transverse groove, 107-second longitudinal groove, 108-vertical groove, 201-FPGA chip, 202-digital-to-analog converter, 203-power amplifier, 204-multiplexer, 205-program-controlled amplifier, 206-analog-to-digital converter, 207-first memory, 208-second memory, 209-USB interface chip, 210-upper computer, 301-first flat box body, 302-second flat box bodyBody 401-trolley 501-unexplosive projectile ① indicates the centre line of a rectangular excitation coil ② indicates the centre line of a rectangular induction coil w1Represents the width of the rectangular excitation coil; w is a2Represents the width of a rectangular induction coil; d1Representing the distance between the intersection point and the center point of the rectangular excitation coil; d2Representing the lateral distance between the rectangular induction coil and the rectangular excitation coil.
Detailed Description
An underground unexplosive bomb frequency domain detection device based on a vertical coupling coil comprises a sensing device and a detection system;
the sensing device comprises a coil framework, a rectangular exciting coil 101 and a rectangular induction coil 102;
the rectangular excitation coil 101 and the rectangular induction coil 102 are wound on the coil framework, and the rectangular induction coil 102 is positioned on the right side of the rectangular excitation coil 101; two long sides of the rectangular excitation coil 101 are longitudinally arranged, and two short sides are transversely arranged; two long sides of the rectangular induction coil 102 are longitudinally arranged, and the length of the rectangular induction coil 102 is equal to that of the rectangular excitation coil 101; two short sides of the rectangular induction coil 102 are vertically arranged, and the width of the rectangular induction coil 102 is smaller than that of the rectangular excitation coil 101; the central line of the rectangular induction coil 102 is vertically intersected with the central line of the rectangular excitation coil 101, and the intersection point is positioned above the central point of the rectangular excitation coil 101;
the detection system comprises an FPGA chip 201, a digital-to-analog converter 202, a power amplifier 203, a multiplexer 204, a program-controlled amplifier 205, an analog-to-digital converter 206, a first memory 207, a second memory 208, a USB interface chip 209 and an upper computer 210;
the output end of the FPGA chip 201 is connected with the input end of the digital-to-analog converter 202; the output end of the digital-to-analog converter 202 is connected with the input end of the power amplifier 203; the output end of the power amplifier 203 is connected with the rectangular exciting coil 101 through the multiplexer 204; the rectangular induction coil 102 is connected with the input end of the programmable amplifier 205 through the multiplexer 204; the output end of the programmable amplifier 205 is connected with the input end of the analog-to-digital converter 206; the output end of the analog-to-digital converter 206 is connected with the input end of the FPGA chip 201; the first memory 207, the second memory 208 and the USB interface chip 209 are all bidirectionally connected with the FPGA chip 201; the upper computer 210 is bidirectionally connected with the USB interface chip 209.
The coil framework comprises a rectangular horizontal plate 103 and a rectangular longitudinal vertical plate 104; the upper surface of the rectangular horizontal plate 103 is provided with a plurality of first longitudinal grooves 105 which are distributed at equal intervals and a plurality of transverse grooves 106 which are distributed at equal intervals, and each first longitudinal groove 105 and each transverse groove 106 form a grid-shaped groove in a crossed manner; two long sides of the rectangular excitation coil 101 are respectively embedded in two of the first longitudinal grooves 105, and two short sides are respectively embedded in two of the transverse grooves 106; the rectangular vertical plate 104 is fixed on the right edge of the upper surface of the rectangular horizontal plate 103; a plurality of second longitudinal grooves 107 distributed at equal intervals and a plurality of vertical grooves 108 distributed at equal intervals are formed on the left surface of the rectangular longitudinal vertical plate 104; each second longitudinal groove 107 and each vertical groove 108 form a grid-shaped groove in a crossed manner; two long sides of the rectangular induction coil 102 are respectively embedded in two of the second longitudinal grooves 107, and two short sides of the rectangular induction coil are respectively embedded in two of the vertical grooves 108.
The rectangular exciting coil 101 is formed by winding an enameled wire with the wire diameter of 1mm, and is 1m long, 0.2 m-0.5 m wide and 4-6 turns; the rectangular induction coil 102 is formed by winding an enameled wire with the wire diameter of 0.4mm, the length of the enameled wire is 1m, the width of the enameled wire is 0.1 m-0.15 m, and the number of turns of the enameled wire is 10; the distance between the intersection point and the central point of the rectangular excitation coil 101 is 0.02-0.04 m; the transverse distance between the rectangular induction coil 102 and the rectangular excitation coil 101 is 0.25-0.35 m; the FPGA chip 201 adopts Zynq7000 series FPGA chips; the upper computer 210 is an industrial tablet computer based on LabView.
The rectangular horizontal plate 103 and the rectangular vertical plate 104 are both made of nylon plates with the thickness of 10 mm.
An underground unexplosive bomb frequency domain detection method based on a vertical coupling coil (the method is realized based on the underground unexplosive bomb frequency domain detection device based on the vertical coupling coil), the method is realized by adopting the following steps:
the method comprises the following steps: packaging the sensing device in a first flat box body 301; packaging the detection system in the second flat box body 302, and ensuring that the screen of the upper computer 210 is embedded in the upper wall of the second flat box body 302;
step two: fixing the first flat box body 301 on the frame of the trolley 401, and ensuring that two short edges of the rectangular excitation coil 101 are parallel to the advancing direction of the trolley 401; fixing the second flat box 302 on the push rod of the trolley 401;
step three: determining the soil type of a target area; then, selecting an area as a reference area, ensuring that the soil type of the reference area is consistent with that of the target area, and ensuring that no metal object exists in the soil of the reference area; then, the trolley 401 is pushed to enter a reference area, and reference signals under different excitation frequencies are determined; the specific determination process is as follows:
step 3.1: initially setting the excitation frequency of the FPGA chip 201 in the upper computer 210; the excitation frequency refers to the frequency of a digital excitation signal output by the FPGA chip 201;
step 3.2: a digital excitation signal output by the FPGA chip 201 is sequentially loaded to the rectangular excitation coil 101 through the digital-to-analog converter 202, the power amplifier 203 and the multiplexer 204, so that a sinusoidal excitation current is generated in the rectangular excitation coil 101, and the rectangular excitation coil 101 excites a sinusoidal excitation magnetic field; under the action of the sinusoidal excitation magnetic field, a sinusoidal induction current is generated in the rectangular induction coil 102, the rectangular induction coil 102 outputs a sinusoidal induction voltage signal, and a coupling magnetic field is formed between the rectangular induction coil 102 and the rectangular excitation coil 101; the sine induced voltage signal is transmitted to the FPGA chip 201 through the multiplexer 204, the program-controlled amplifier 205 and the analog-to-digital converter 206 in sequence; the FPGA chip 201 transmits the sine induction voltage signal to the second memory 208 for storage on one hand, and transmits the sine induction voltage signal to the upper computer 210 for display through the USB interface chip 209 on the other hand;
step 3.3: in the upper computer 210, different settings are carried out on the excitation frequency of the FPGA chip 201, and the steps 3.2-3.3 are executed in a circulating manner, so that sinusoidal induction voltage signals under different excitation frequencies are obtained;
step 3.4: determining sinusoidal induction voltage signals under different excitation frequencies as reference signals under different excitation frequencies;
step four: burying unexploded bombs 501 in soil of a reference area; then, pushing the cart 401 to reach the upper part of the unexploded bomb 501, and performing frequency sweeping identification on the unexploded bomb 501; the specific sweep frequency identification process is as follows:
step 4.1: initially setting the excitation frequency of the FPGA chip 201 in the upper computer 210;
step 4.2: a digital excitation signal output by the FPGA chip 201 is sequentially loaded to the rectangular excitation coil 101 through the digital-to-analog converter 202, the power amplifier 203 and the multiplexer 204, so that a sinusoidal excitation current is generated in the rectangular excitation coil 101, and the rectangular excitation coil 101 excites a sinusoidal excitation magnetic field; under the action of the sinusoidal excitation magnetic field, a sinusoidal induction current is generated in the rectangular induction coil 102, the rectangular induction coil 102 outputs a sinusoidal induction voltage signal, and a coupling magnetic field is formed between the rectangular induction coil 102 and the rectangular excitation coil 101; in the process, the unexplosive projectile 501 cuts the coupling magnetic field and disturbs the coupling magnetic field, so that a direct-current characteristic signal is superposed on the sinusoidal induction voltage signal; the sinusoidal induction voltage signal superimposed with the direct-current characteristic signal is transmitted to the FPGA chip 201 through the multiplexer 204, the program-controlled amplifier 205 and the analog-to-digital converter 206 in sequence; the FPGA chip 201 performs digital phase-sensitive demodulation on the sinusoidal induction voltage signal superimposed with the direct-current characteristic signal, so as to extract the direct-current characteristic signal, and then transmits the direct-current characteristic signal to the first memory 207 for storage on one hand, and transmits the direct-current characteristic signal to the upper computer 210 for display and signal-to-noise ratio calculation through the USB interface chip 209 on the other hand;
step 4.3: in the upper computer 210, different settings are carried out on the excitation frequency of the FPGA chip 201, and the steps 4.2-4.3 are executed in a circulating manner, so that direct-current characteristic signals under different excitation frequencies are obtained;
step five: determining the optimal excitation frequency by comparing the signal-to-noise ratio and the significance degree of the direct current characteristic signals under different excitation frequencies;
step six: optimally setting the excitation frequency of the FPGA chip 201 in the upper computer 210; then, the cart 401 is pushed to travel within the target area; in the advancing process, if no metal object appears in the soil below the trolley 401, a sine induced voltage signal is displayed in the upper computer 210; if a metal object appears in the soil below the trolley 401, the metal object cuts the coupling magnetic field and disturbs the coupling magnetic field, so that the sinusoidal induction voltage signal displayed in the upper computer 210 generates a waveform sudden change; at this time, whether the metal object belongs to the unexploded bomb 501 is judged according to the sudden change of the waveform:
if the sudden change of the waveform appears as a wave crest and a wave trough, the metal object does not belong to the unexploded bomb 501, and the trolley 401 continues to be pushed to move;
if the waveform mutation appears as a single peak, the metal object belongs to the unexploded bomb 501; at the moment, the trolley 401 is stopped at the original place, and sweep frequency identification is carried out on the unexploded bomb 501, so that direct current characteristic signals under different excitation frequencies are obtained; then, executing the seventh step to the eighth step;
step seven: the upper computer 210 reads the direct current characteristic signals under different excitation frequencies from the first memory 207 on one hand, and reads the reference signals under different excitation frequencies from the second memory 208 on the other hand, and performs difference between the direct current characteristic signals under different excitation frequencies and the reference signals to obtain difference signals under different excitation frequencies, so as to draw a real part spectrogram and an imaginary part spectrogram;
the real part spectrogram is a relation curve chart between the real part of the difference signal and the excitation frequency;
the imaginary part spectrogram is a relation curve graph between the imaginary part of the difference signal and the excitation frequency;
step eight: according to the first peak frequency in the real part spectrogram and the second zero-crossing frequency in the imaginary part spectrogram, the type of the unexploded bomb 501 is identified, and therefore the detection of the unexploded bomb 501 is achieved.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (5)
1. The utility model provides an underground unexplosive bomb frequency domain detection device based on vertical coupling coil which characterized in that: comprises a sensing device and a detection system;
the sensing device comprises a coil framework, a rectangular exciting coil (101) and a rectangular induction coil (102);
the rectangular excitation coil (101) and the rectangular induction coil (102) are wound on the coil framework, and the rectangular induction coil (102) is positioned on the right side of the rectangular excitation coil (101); two long sides of the rectangular excitation coil (101) are longitudinally arranged, and two short sides of the rectangular excitation coil are transversely arranged; two long sides of the rectangular induction coil (102) are longitudinally arranged, and the length of the rectangular induction coil (102) is equal to that of the rectangular excitation coil (101); two short sides of the rectangular induction coil (102) are vertically arranged, and the width of the rectangular induction coil (102) is smaller than that of the rectangular excitation coil (101); the central line of the rectangular induction coil (102) is vertically intersected with the central line of the rectangular excitation coil (101), and the intersection point is positioned above the central point of the rectangular excitation coil (101);
the detection system comprises an FPGA chip (201), a digital-to-analog converter (202), a power amplifier (203), a multiplexer (204), a program-controlled amplifier (205), an analog-to-digital converter (206), a first memory (207), a second memory (208), a USB interface chip (209) and an upper computer (210);
the output end of the FPGA chip (201) is connected with the input end of the digital-to-analog converter (202); the output end of the digital-to-analog converter (202) is connected with the input end of the power amplifier (203); the output end of the power amplifier (203) is connected with the rectangular exciting coil (101) through a multiplexer (204); the rectangular induction coil (102) is connected with the input end of the program control amplifier (205) through the multiplexer (204); the output end of the programmable control amplifier (205) is connected with the input end of the analog-to-digital converter (206); the output end of the analog-to-digital converter (206) is connected with the input end of the FPGA chip (201); the first memory (207), the second memory (208) and the USB interface chip (209) are all in bidirectional connection with the FPGA chip (201); the upper computer (210) is bidirectionally connected with the USB interface chip (209).
2. The underground unexploded frequency domain detection device based on the vertical coupling coil as claimed in claim 1, characterized in that: the coil framework comprises a rectangular horizontal plate (103) and a rectangular longitudinal vertical plate (104); the upper surface of the rectangular horizontal plate (103) is provided with a plurality of first longitudinal grooves (105) which are distributed at equal intervals and a plurality of transverse grooves (106) which are distributed at equal intervals, and the first longitudinal grooves (105) and the transverse grooves (106) are crossed to form grid-shaped grooves; two long sides of the rectangular excitation coil (101) are respectively embedded in two first longitudinal grooves (105) and two short sides are respectively embedded in two transverse grooves (106); the rectangular vertical plate (104) is fixed on the right edge of the upper surface of the rectangular horizontal plate (103); a plurality of second longitudinal grooves (107) which are distributed at equal intervals and a plurality of vertical grooves (108) which are distributed at equal intervals are formed in the left surface of the rectangular longitudinal vertical plate (104); each second longitudinal groove (107) and each vertical groove (108) form a grid-shaped groove in a crossed mode; two long sides of the rectangular induction coil (102) are respectively embedded in two second longitudinal grooves (107) and two short sides of the rectangular induction coil are respectively embedded in two vertical grooves (108).
3. An underground unexploded bomb frequency domain detection device based on vertical coupling coil as claimed in claim 1 or 2, characterized in that: the rectangular excitation coil (101) is formed by winding an enameled wire with the wire diameter of 1mm, the length of the enameled wire is 1m, the width of the enameled wire is 0.2 m-0.5 m, and the number of turns of the enameled wire is 4-6 turns; the rectangular induction coil (102) is formed by winding an enameled wire with the wire diameter of 0.4mm, the length of the enameled wire is 1m, the width of the enameled wire is 0.1 m-0.15 m, and the number of turns of the enameled wire is 10; the distance between the intersection point and the central point of the rectangular excitation coil (101) is 0.02-0.04 m; the transverse distance between the rectangular induction coil (102) and the rectangular excitation coil (101) is 0.25-0.35 m; the FPGA chip (201) adopts Zynq7000 series FPGA chips; the upper computer (210) adopts an industrial tablet computer based on LabView.
4. The underground unexploded frequency domain detection device based on the vertical coupling coil as claimed in claim 2, characterized in that: the rectangular horizontal plate (103) and the rectangular vertical plate (104) are both made of nylon plates with the thickness of 10 mm.
5. An underground unexplosive bomb frequency domain detection method based on a vertical coupling coil is realized based on the underground unexplosive bomb frequency domain detection device based on the vertical coupling coil according to claim 1, and is characterized in that: the method is realized by adopting the following steps:
the method comprises the following steps: packaging a sensing device in a first flat box body (301); packaging the detection system in a second flat box body (302), and ensuring that a screen of the upper computer (210) is embedded in the upper wall of the second flat box body (302);
step two: fixing the first flat box body (301) on a frame of a trolley (401), and ensuring that two short sides of the rectangular excitation coil (101) are parallel to the advancing direction of the trolley (401); fixing the second flat box body (302) on a push rod of the trolley (401);
step three: determining the soil type of a target area; then, selecting an area as a reference area, ensuring that the soil type of the reference area is consistent with that of the target area, and ensuring that no metal object exists in the soil of the reference area; then, pushing a trolley (401) to enter a reference area, and determining reference signals under different excitation frequencies; the specific determination process is as follows:
step 3.1: initially setting the excitation frequency of the FPGA chip (201) in an upper computer (210); the excitation frequency refers to the frequency of a digital excitation signal output by the FPGA chip (201);
step 3.2: a digital excitation signal output by the FPGA chip (201) is sequentially loaded to the rectangular excitation coil (101) through a digital-to-analog converter (202), a power amplifier (203) and a multiplexer (204), so that a sinusoidal excitation current is generated in the rectangular excitation coil (101), and the rectangular excitation coil (101) excites a sinusoidal excitation magnetic field; under the action of a sinusoidal excitation magnetic field, a sinusoidal induction current is generated in the rectangular induction coil (102), the rectangular induction coil (102) outputs a sinusoidal induction voltage signal, and a coupling magnetic field is formed between the rectangular induction coil (102) and the rectangular excitation coil (101); the sinusoidal induction voltage signal is transmitted to the FPGA chip (201) through a multiplexer (204), a programmable amplifier (205) and an analog-to-digital converter (206) in sequence; the FPGA chip (201) transmits the sine induction voltage signal to a second memory (208) for storage on one hand, and transmits the sine induction voltage signal to an upper computer (210) for display through a USB interface chip (209) on the other hand;
step 3.3: different settings are carried out on the excitation frequency of the FPGA chip (201) in the upper computer (210), and the steps 3.2-3.3 are executed in a circulating mode, so that sinusoidal induction voltage signals under different excitation frequencies are obtained;
step 3.4: determining sinusoidal induction voltage signals under different excitation frequencies as reference signals under different excitation frequencies;
step four: burying a non-explosive bomb (501) in soil of a reference area; then, pushing the trolley (401) to reach the upper part of the unexploded bomb (501), and carrying out frequency sweeping identification on the unexploded bomb (501); the specific sweep frequency identification process is as follows:
step 4.1: initially setting the excitation frequency of the FPGA chip (201) in an upper computer (210);
step 4.2: a digital excitation signal output by the FPGA chip (201) is sequentially loaded to the rectangular excitation coil (101) through a digital-to-analog converter (202), a power amplifier (203) and a multiplexer (204), so that a sinusoidal excitation current is generated in the rectangular excitation coil (101), and the rectangular excitation coil (101) excites a sinusoidal excitation magnetic field; under the action of a sinusoidal excitation magnetic field, a sinusoidal induction current is generated in the rectangular induction coil (102), the rectangular induction coil (102) outputs a sinusoidal induction voltage signal, and a coupling magnetic field is formed between the rectangular induction coil (102) and the rectangular excitation coil (101); in the process, the coupling magnetic field is cut by the unexplosive projectile (501) and disturbed, so that a direct-current characteristic signal is superposed on the sinusoidal induction voltage signal; the sinusoidal induction voltage signal superposed with the direct-current characteristic signal is transmitted to the FPGA chip (201) through a multiplexer (204), a program-controlled amplifier (205) and an analog-to-digital converter (206) in sequence; the FPGA chip (201) performs digital phase-sensitive demodulation on the sinusoidal induction voltage signal superposed with the direct-current characteristic signal, so as to extract the direct-current characteristic signal, and then transmits the direct-current characteristic signal to the first memory (207) for storage on one hand, and transmits the direct-current characteristic signal to the upper computer (210) through the USB interface chip (209) for display and signal-to-noise ratio calculation on the other hand;
step 4.3: in the upper computer (210), different settings are carried out on the excitation frequency of the FPGA chip (201), and the steps 4.2-4.3 are executed in a circulating manner, so that direct-current characteristic signals under different excitation frequencies are obtained;
step five: determining the optimal excitation frequency by comparing the signal-to-noise ratio and the significance degree of the direct current characteristic signals under different excitation frequencies;
step six: optimally setting the excitation frequency of the FPGA chip (201) in the upper computer (210); then, pushing a cart (401) to travel within the target area; in the advancing process, if no metal object appears in the soil below the trolley (401), a sine induced voltage signal is displayed in the upper computer (210); if a metal object appears in the soil below the trolley (401), the metal object cuts the coupling magnetic field and disturbs the coupling magnetic field, so that a sine induced voltage signal displayed in the upper computer (210) generates a waveform sudden change; at the moment, whether the metal object belongs to the unexploded bomb or not is judged according to the sudden change situation of the waveform (501):
if the wave shape mutation appears as a wave crest and a wave trough, the metal object is not a non-explosive bomb (501), and the trolley (401) is pushed to move continuously;
if the waveform mutation presents a single peak, the metal object is shown to belong to an unexploded bomb (501); at the moment, the trolley (401) is stopped at the original place, and sweep frequency identification is carried out on the unexploded bomb (501), so that direct current characteristic signals under different excitation frequencies are obtained; then, executing the seventh step to the eighth step;
step seven: the upper computer (210) reads the direct current characteristic signals under different excitation frequencies from the first storage (207) on one hand, and reads the reference signals under different excitation frequencies from the second storage (208) on the other hand, and performs difference on the direct current characteristic signals under different excitation frequencies and the reference signals to obtain difference signals under different excitation frequencies, so as to draw a real part spectrogram and an imaginary part spectrogram;
the real part spectrogram is a relation curve chart between the real part of the difference signal and the excitation frequency;
the imaginary part spectrogram is a relation curve graph between the imaginary part of the difference signal and the excitation frequency;
step eight: and identifying the type of the unexploded bomb (501) according to a first peak frequency in the real part spectrogram and a second zero-crossing frequency in the imaginary part spectrogram, thereby realizing the detection of the unexploded bomb (501).
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