KR102001246B1 - Apparatus for detecting metal explosives buried underground by multi mode of time domain and frequency domain method - Google Patents

Abstract

The present invention relates to an explosive detection apparatus, and more particularly, to an explosive detection apparatus that improves reliability of metal mine detection, provides information such as kind, size, and posture of a metal and high similarity with mine or explosive materials, And more particularly to a time-domain and frequency-domain processing complex mode metal explosive detection device for enhancing work efficiency and safety of an operator by providing additional warning when a warning is issued.
To this end, the present invention forms a concentric structure with two transmission coils and one reception coil, using only one transmission coil for time domain processing and using two transmission coils for frequency domain processing In the central portion where the receiving coils are located, the primary magnetic fields generated by the two transmitting coils cancel each other to minimize the influence on the receiving coils. The receiving coils are commonly used in both time domain processing and frequency domain processing. A transmitter for generating one output signal in case of time domain processing and two output signals in case of frequency domain processing; A receiving unit for receiving a received signal in a time domain or a frequency domain; And a control processor for controlling the transmitter and outputting a result of the metal explosive detection from the measurement data received by the receiver; And an explosive detection device.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a time-domain and frequency-domain-processing complex mode metal explosive detection apparatus,

The present invention relates to an explosive detection system, and more particularly, to realize an apparatus capable of utilizing both a time domain and a frequency domain processing system in a complex manner, both systems are implemented on the same hardware platform, To improve the reliability of metal mine detection and to provide information on the type, size and attitude of the metal and to provide additional warnings when similarity is high compared to mine or explosive materials that are likely to be buried in the area. The present invention relates to a time-domain and frequency-domain processing type multi-mode metal explosive detection device for improving work efficiency and safety of a worker in detection and removal of mines.

Globally, it is estimated that between 50,000 and 100 million mines are buried in 60 countries, with 4,000 deaths every year and 10 deaths every day. Detecting and removing such landmines is very costly and time consuming. In order to detect and remove these mines, a mine detector is indispensable. Traditionally, metal mine detectors have been used. Most of the land mines are made of non-metals, such as mine mines or plastic mines. It is an important issue to detect these effectively.

New methods such as GPR (Ground Penetration Radar), (supersonic), and chemical sensor have emerged as a way to compensate for this problem. However, as in the case of GPR, It has been known that it is difficult to completely solve the problem by any one method since there is a problem such as shallowness compared with the metal mine detector. Therefore, a method of using various methods in combination may be proposed, but due to problems of cost and operability Metal mine detectors will continue to be used as basic equipment for a considerable period of time.

The current method of removing land mines involves first navigating the target area with a mine detector (usually a metal mine detector), and when a metal mine detector detects a metal presence warning sound, it pierces the periphery using an instrument such as a probe, And check the size of the mine, or directly dig out the surrounding soil to check whether or not the mine is mine (see FIG. 1). Most metal mine detectors only warn about the presence of metallic substances, they do not provide any additional information about the target metal, so the operator has to look at the probe directly without any prior knowledge, have.

The most widely deployed metal mine detector currently uses magnetic induction. That is, when a magnetic field is applied to a metal, Eddy current is generated on the surface of the metal, and a secondary magnetic field generated by the Eddy current is received to detect the presence of the metal.

Such a magnetic induction type metal detection technique can be broadly divided into a time domain and a frequency domain based on a signal system for generating and receiving a magnetic field.

Pulse induction (PI) method, which is a typical method of time domain processing, generates a magnetic field from a pulse signal in a transmitter, which rapidly turns on / off. This primary magnetic field changes the eddy current in the ground metal, And a secondary magnetic field is generated by using the principle of detecting the presence of metal. This secondary magnetic field is no longer changed after the primary magnetic field is turned off from On, and it is attenuated with time and disappears. The time damping coefficient is slightly different depending on the metal.

The time-domain processing method is able to output a large transmission signal without mutual interference between the transmitting and receiving coils due to the separation of the transmission time and the receiving time, so that it can detect the depth of the ground compared to other methods, It is known that the soil with mineral soil composition is relatively less sensitive than the other methods. Also, it is advantageous in that the algorithm is simple and the processing speed is fast during detection.

However, in the case of a metal having a small size, the time domain processing method may generate a very weak signal and cause the reception signal to disappear before the reception part is operated, so that reception can not be performed. Therefore, the reception sensitivity is generally lower than that of the frequency domain processing method In order to compensate for this, a very large output transmission signal is used and the sensitivity of the receiver is increased. Therefore, in addition to mines and explosives, small metal fragments such as nails and wires are also detected. It is difficult to distinguish the type of metal because the detection signal is a time attenuation coefficient, which is a factor that increases the risk of accidents by reducing the attention of workers. have.

The frequency domain processing method is the same as the time domain processing method in that the eddy current and the secondary magnetic field generated by the magnetic induction on the surface of the metal are used. However, when the transmitting / receiving signal to be used is a specific frequency signal Frequency band, but it can transmit arbitrary frequency according to the operating environment), and then receives the same frequency signal generated by the secondary magnetic field caused by the eddy current generated in the ground metal, The size and phase of the frequency component are changed according to the size, the attitude, and the like, and information on the type, size, and posture of the metal as well as the presence of the metal can be additionally obtained.

This frequency domain processing scheme may use a single frequency, but in order to obtain more information, it is possible to increase the reliability of the result by classifying the kind of metal by measuring the magnitude and phase characteristics at various frequencies using multiple frequencies . By using the above characteristics, it can be utilized to mitigate the false positive detection rate which is a side effect in high-power operation and high output in the time domain processing system. However, in this case, the system implementation complexity increases and the processing time increases.

Unlike the time domain processing method in which transmission and reception are separated in time, this frequency domain processing scheme is very important because the transmission and reception are simultaneously performed and the transmission and reception signals are separated in order to minimize the interference between the transmission and reception signals. The easiest method is to separate the transmit coil and the receive coil from each other. This method is not suitable for portable application because the size of the device is too large, and it is difficult to find the exact position even when the transmit and receive sensors are operated at different positions have.

One of the methods for solving this problem is a transmission / reception sensor of a concentric type (FIG. 2), in which two circular transmission coils having the same center are flowed in opposite directions, A magnetic cavity in which the magnetic fields generated by the coils are canceled out to each other is made so as to receive only the secondary magnetic field generated from the ground metal while minimizing transmission signal interference in the central portion having the receiving coil, Is that the far-field caused by the transmission coil reaches almost without attenuation.

However, since the metal mine detector targets objects at a very short distance, a certain degree of attenuation occurs for a close object, which may cause a loss of the maximum transmission power as compared with the time domain processing method. In addition, the biggest problem of the frequency domain processing method is that it is sensitive to the minerals in the soil, and it is known that the deterioration of performance in the region where the mineral content is large is larger than the time domain processing method.

As can be seen from the above, the time domain processing method and the frequency domain processing method have advantages and disadvantages. Therefore, the safety and efficiency of mine detection and removal can be improved by taking advantage of both methods. That is, the time-domain processing method is capable of transmitting at a high detection speed, a deep reaching depth, a relatively less sensitive characteristic to the mineral component of the soil in the target area, It is advantageous in that reception sensitivity is good with respect to small metal objects, and in particular, information on the type, size, and posture of the metal can be estimated by analyzing the size and phase component of the received frequency component.

US 5,557,206 discloses a concentric coil structure having two transmitting coils and a receiving coil on the inner side, and has an outermost layer and a The transmitting coils located at the inner side are connected to each other to flow the same magnitude of currents in opposite directions so that the magnetic field generated by the two transmitting coils is canceled with each other at the central portion where the receiving coils are present to minimize the influence of the transmitting coils, So that only the secondary magnetic field can be received.

According to the present invention, this structure is used in the frequency domain processing method, but the two coil coils are not connected to each other, and the number of coil windings and the current are set so as to cancel each other in the central portion of the receiving coil, . In the frequency domain processing method, two transmission coils and one reception coil are used as described above, and in the time domain processing method, only one of the two transmission coils is used. In the time domain and frequency domain processing method To be used for all.

U.S. 5,557,206 (Sep. 17, 1996)

The present invention has been made in order to solve the problems of the conventional metal mine detector as described below, and it is an object of the present invention to provide a time-domain and frequency-domain processing multi-mode metal explosive detection apparatus.

First, the current method of removing land mines is to first search the target area with a mine detector (usually a metal mine detector), and when it warns about the presence of metallic material, it pierces the periphery using a tool such as a probe, Or check the minefield by digging the soil around yourself. Most metal mine detectors simply warn against the presence of metallic substances, and do not provide additional information about the target metal material, so the operator must perform very dangerous tasks, such as direct search without any additional information other than the possibility that the mine is buried. There is a need to improve the problem.

Second, current metal mine detectors use extremely high power transmission signals to detect very small metal components, such as mock mines and plastic mines, and manufacture and operate them with higher sensitivity. Small metal fragments such as wire are detected as well and the false detection rate is very high, which is a waste of work time and reduces the attention of workers and increases the risk of accidents.

Third, it is necessary to solve the above problems, but there is no increase in the implementation cost, and there is no increase in the weight or size of the mine detector, so an effective method for maintaining the portability is needed.

In order to accomplish the above object, there is provided an apparatus for detecting metal explosives in a time domain and a frequency domain in a time domain and a frequency domain, comprising: a transmission coil and a receiving coil for forming a concentric structure , Only one transmission coil is used for time domain processing and two transmission coils are used for frequency domain processing so that the primary magnetic fields due to the two transmission coils are offset from each other at the central portion where the reception coil is located, And the reception coil is commonly used for both time domain processing and frequency domain processing; A transmitter for generating one output signal in case of time domain processing and two output signals in case of frequency domain processing; A receiving unit for receiving a received signal in a time domain or a frequency domain; And a control processor for controlling the transmitter and outputting a result of the metal explosive detection from the measurement data received by the receiver; And a control unit.

Here, the transmission unit may include a transmission processing unit; And a transmission output half 1 and a transmission output half 2 driving a current according to a signal of the transmission processing unit; And the transmission processing unit is composed of a 2-channel arbitrary waveform generator, a DA converter and a low-pass filter, and the output of the 2 channels is 1: 1 connected to the transmission output half 1 and the transmission output half 2, respectively .

In the case of the frequency domain processing method, the transmission output half 1 and the transmission output half 2 are connected to two transmission coils at a ratio of 1: 1, and the transmission signals of the transmission output half 1 and the transmission output half 2 are synchronously output And the magnetic field is canceled by flowing a current in the opposite direction to each other.

Preferably, the control processing unit is provided with a mode selection switch for switching between a time domain processing method and a frequency domain processing method.

Alternatively, the control processing unit is provided with an inertial sensor and is automatically switched to the time domain processing method and the frequency domain processing method according to the traveling direction of the transmission / reception sensor.

In addition, when the metal explosive is detected by the time-domain processing method and it is judged that the metal is present, the mode is switched by the frequency domain processing method and the additional information is acquired using the frequency-dependent size and phase information obtained by re- .

Alternatively, the present invention can detect both the time domain processing method and the frequency domain processing method at all points in the detection area in a redundant manner, detect using the frequency domain processing method, add Information is acquired.

Herein, in addition to the above-mentioned additional information, the data is provided to the operator along with the additional warning if there is a possibility that the explosive is likely to be compared with the data on the explosive which is likely to be buried.

The time-domain and frequency-domain-processed multi-mode metal explosive detection apparatus of the present invention constructed in this way implements two types of time domain and frequency domain processing schemes on a single hardware platform and provides a time domain and frequency domain multi- Devices that can take full advantage of both approaches can be implemented on the same hardware platform.

 In other words, the time-domain processing method is a simple algorithm that can detect the speed of the detection, transmit and receive are separated, can be transmitted to high ground without any restriction, reach deep ground, In the case of the frequency domain processing method, the receiving sensitivity is good with respect to small metal objects, and in particular, the advantage of extracting useful information such as the type, size and attitude of the metal by analyzing the size and phase characteristic of the received frequency component .

This will improve the reliability of detection of metal mines, provide information on the type, size and attitude of metals, and provide additional warnings when similarity is high compared to mine or explosive materials that are likely to be buried in the area, And the work efficiency can be improved in the removal work and the safety of the worker can be remarkably improved.

1 is a view showing an example of a mine detection using a metal mine detector and a precision detection using a probe;
FIG. 2 is a conceptual diagram of operation of a Concentric type transceiver sensor applied to a metal detector of a general frequency domain processing method; FIG.
3 is a structural view of a Concentric transmission / reception sensor applied to a metal detector of a general frequency domain processing method;
FIG. 4 is a block diagram showing a time-domain and frequency-domain-processed mixed mode metal explosive detection apparatus according to the present invention; FIG.
5 is a signal waveform diagram of a transmitter and a receiver in a time domain processing scheme;
FIG. 6 shows characteristics of a transmission signal and a reception signal in a frequency domain processing scheme;
FIG. 7 is a flowchart of a general operation mode according to an embodiment of the present invention; FIG.
FIG. 8 is a double-complex operational mode flowchart according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present embodiment, the same names are used for the same components, and further description thereof will be omitted.

FIG. 4 is a block diagram showing a time-domain and frequency-domain-processed mixed mode metal explosive detection apparatus (hereinafter referred to as a "detector") according to the present invention. The overall configuration is largely composed of the control processing unit 10, the transmitting unit 20, the receiving unit 30, and the transmitting / receiving sensor 40.

The control processing unit 10 monitors the status of the entire equipment and operates the transmission unit and the reception unit by setting the operation mode according to the user's setting and receives the measured data from the reception unit to receive information on the metal detection, the metal type, Extracts and transmits it to the user through sound, vibration, screen, storage medium or communication network.

The control processing unit 10 includes a control processing unit 11, an external connection unit 12, and a mode selection switch 13. The control processing unit 11 is composed of a processor, a program memory, a data storage memory, and other supporting elements. The control processing unit 11 performs all processing by the built-in program and performs most of the main functions of the control processing unit 10.

The external connection unit 12 is responsible for monitoring, controlling, and outputting the results of the detector to the user. The external connection unit 12 is provided with a screen output device, an earphone or speaker connection for outputting sound, a wired connection such as vibration, wireless network such as WiFi or Bluetooth, Devices can be used.

The mode selection switch 13 is a switch for selecting the operation mode of the time domain processing method and the frequency domain processing method by the user as a switch, and selects the mode according to the detection by the control processing module 11. Another mode of the mode selection switch 13 is an inertial sensor. When the user moves the detector to the left or to the right, the inertia sensor senses that the left and right ends move in opposite directions, It is also possible to implement a method of automatically selecting a switch even if the user does not press the switch directly.

The transmission section 20 plays a role of generating a time domain or frequency domain transmission signal in accordance with the setting of the control processing section 10 and causing the transmission coils 41 and 42 of the transmission and reception sensor 40 to flow as a current to generate a primary magnetic field do. The transmission signal is used to output a pulse signal according to time domain or frequency domain processing (time domain processing) or to output a single specific frequency or multiple frequency signal (frequency domain processing method).

The transmission section 20 includes a transmission output half 1 (22) and a transmission output half 2 (23) for driving current in accordance with a transmission processing section 21 and a transmission processing section 21 signal. The transmission processing section 21 is composed of an arbitrary waveform generator of two channels, a DA converter and a low-pass filter (the transmission processing section 21 may place the DA converter and the low-pass filter in the transmission output half, depending on the design) The output is connected to transmit output half 1 (22) or transmit output half 2 (23), respectively, and serves to generate the transmit signal waveform according to the time domain processing method and the frequency domain processing method.

In the time domain processing method, a pulse signal which is abruptly attenuated at the time of off like the transmission current of FIG. 5 is generated in a fixed period, a variable period or a random period, and the transmission output half 1 (22) or the transmission output half 2 The selection of the transmission output half 1 (22) or the transmission output half 2 (23) may be performed by selecting one of the transmission coil 1 41 having a large radius and the transmission coil 2 42 having a small radius And the transmission output 1 (22) is connected to the transmission coil 1 (41) and the transmission output 2 (23) in a 1: 1 relationship with the transmission coil 2 (42).

In the case of frequency domain processing, a single frequency or multiple frequencies are used (the frequency of use is generally, but not exclusively, a low frequency signal between 1 kHz and 100 kHz to improve underground penetration characteristics) The frequency may be generated by sequentially changing preselected frequencies, or may be generated as a signal having multiple frequency characteristics such as a Sync signal or a Chirp signal.

In the case of the frequency domain processing method, both the transmission coil 1 42 and the transmission coil 2 43 of the transmission / reception sensor 40 are used, so that the transmission output half 1 (22) and the transmission output half 2 (23) The transmission output half 1 transmission signal 51 and the transmission output half 2 transmission signal 52 are exactly synchronized with each other in a manner that the transmission coil 1 42 and the transmission coil 2 43 of the first and second transmission antennas 40 and 40 are 1: So that the currents flow in opposite directions to each other to minimize the interference caused by the transmission signal to the reception coil 43 at the center of the transmission / reception sensor 40 to cancel each other.

The receiving unit 30 receives the secondary magnetic field generated by the eddy current generated on the surface of the ground metal due to the primary magnetic field generated through the transmitting unit 20 and the transmitting / receiving sensor 40, (Time domain processing method), or extracts frequency-specific size and phase characteristics and sends it to the control processing unit 10. The control processor 10 receives the signal received from the controller 43 and low noise amplifies the signal.

The receiving unit 30 is composed of a receiving RF unit 32 and a receiving processing unit 31. The receiving RF module converts the reception coil reception signal 53 received from the reception coil 43 of the transmission / reception sensor 40, low-noise amplifies it, and sends it to the reception processing module 31. The reception processing unit 31 receives and processes the reception signal received from the reception RF unit 32 according to the time domain processing method and the frequency domain processing method. 5), and sends it to the control processing section 11 of the control processing section 10. In the frequency domain processing, the control section 10 receives the attenuation characteristic (the measured signal of FIG. 5) The frequency-dependent size and phase information are extracted by performing FFT processing on the received signal (V _{R in} FIG. 6) (synchronous detection (in the case of sequentially changing frequency) To the control processing unit (11).

The transmission / reception sensor 40 is composed of two transmission coils 41 and 42 for generating a primary magnetic field and a reception coil 43 for receiving a secondary magnetic field generated from the surface of the ground metal by the primary magnetic field. The transmission coil 1 41 and the transmission coil 2 42 generate a primary magnetic field in accordance with the driving of the transmission output half 1 (22) and the transmission output half 2 (23) of the transmitter 20 connected in a 1: The receiving coil 43 receives the secondary magnetic field generated from the surface of the ground metal by the primary magnetic field and sends the secondary magnetic field to the receiving RF module 32 of the receiving section 30. They use a concentric scheme consisting of two transmission coils 41 and 42 and one reception coil 43 for both time domain and frequency domain processing schemes. The operation of the transmission / reception sensor 40 is as follows.

First, when the time domain processing method is operated, a pulse signal which is sharply attenuated at the time of off like the transmission current of FIG. 5 is transmitted to the transmission output half (one of the transmission output half 1 22 and the transmission output half 2 23) (One of the transmission coil 1 41 and the transmission coil 2 42) connected thereto at a ratio of 1: 1. Since the transmission signal and the reception signal are temporally separated during operation using the time domain processing method, there is no problem of transmission / reception signal separation, so only one of the two transmission coils of the transmission / reception sensor 40 is used (accordingly, 20) - Transmission output half 1 (22) - Selection of combination of transmission coil 1 (41) or transmission output half 2 (23) - transmission coil 2 (42) depends on the purpose of use Is determined in consideration of the operating characteristics of the transmission coil 1 41 having a large radius and the transmission coil 2 42 having a small radius.

In the case of frequency domain processing, a single frequency or multiple frequencies are used (the frequency of use is generally, but not exclusively, a low frequency signal between 1 kHz and 100 kHz to improve underground penetration characteristics) The frequency may be generated by sequentially changing preselected frequencies, or may be generated as a signal having multiple frequency characteristics such as a Sync signal or a Chirp signal.

In the case of the frequency domain processing method, since the transmission signal and the reception signal occur almost simultaneously, the transmission signal enters the reception signal and causes interference. Therefore, it is very important to separate the transmission and reception signals in order to minimize the transmission and reception signals. To this end, the magnetic fields generated by the two transmission coils (transmission coil 1 41 and transmission coil 2 42) are opposite to each other in the vicinity of the center of transmission / reception sensor 40 where reception coil 43 is located, 2, the magnetic field generated by the transmission coil is canceled. For this purpose, the winding current, the radius, and the current flowing through the coils of the transmission coil 1 41 and the transmission coil 2 42 must satisfy the following equation do.

은 송신코일1(41)의 전류(51),

는 송신코일2(42)의 전류(52),

는 송신코일1(41)의 코일 권선수,

는 송신코일2(42)의 코일 권선수,

은 송신코일1(41)의 반경(71),

는 송신코일2(42)의 반경(72),

은 수신코일(43)의 반경(73)이다. 따라서, 송수신센서(40)의 설계 및 제작 시에는 이상의 조건을 만족하는 값으로 송수신센서(40)가 설계 및 제작되어야 한다.here

The current 51 of the transmission coil 41,

The current 52 of the transmission coil 2 42,

Is the coil winding angle of the transmission coil 1 (41)

Is the coil winding number of the transmission coil 2 (42)

The radius 71 of the transmission coil 41,

The radius 72 of the transmission coil 2 42,

Is the radius (73) of the receiving coil (43). Therefore, at the time of designing and manufacturing the transmission / reception sensor 40, the transmission / reception sensor 40 should be designed and manufactured with a value satisfying the above conditions.

Operation of the equipment is possible with single mode operation and multiple mode operation. Single mode operation is a conventional operation method using only one of the time domain processing method and the frequency domain processing method. Combined mode operation allows you to choose between the general and mixed operation modes.

First, the general operation mode is basically a time-domain processing method with a high processing time. However, when the metal detection beep sounds, only the vicinity of the place where the beeping sound is generated is detected by the frequency domain processing method. And attitude of the mine, and the characteristics of land mines that are highly likely to be buried in the target area. When the similarity is high, the alert level is raised to give more attention to the operator, and information necessary for precision detection and removal is provided.

The specific procedure is as shown in Fig. The operator performs the metal detection operation with the transmit / receive sensor 40 as close as possible to the ground with the detector set to the time domain processing method at each point. If metal is not detected during time-domain processing, metal detection will be continued. If metal is detected, warning beep will be issued.

The user switches the mode to the frequency domain processing mode through the mode selection switch 13 and re-detects the point where the metal is just detected by the frequency domain processing method. If the metal is re-detected again, the size and phase information of the measured frequency is analyzed and it is examined whether there is a characteristic similar to the land mine which is likely to be buried in the area. If there is a similarity, Give a strong warning to work with caution, and provide information that will help you with precise detection using information such as metal type, size, and posture on screen, voice, storage media, or network connection methods, and continue detection .

Normally, if a metal detection warning is issued, the operation using the detector is stopped during the precision detection operation for the precision detection using the probe. If a metal is not detected at the time of detection of the frequency domain processing method, the situation is notified and only the information related to the metal detection for the precision detection using the probe is transmitted, and the continuation of the detection operation is confirmed.

In the duplex operation mode, all the points are detected twice in a time-domain processing method and a frequency-domain processing method, and the time is longer. However, the operation mode for further increasing the safety of the detection operation is as follows. Respectively.

The operator searches the presence or absence of the metal by moving the transmission / reception sensor 40 as much as possible with the detector set to the time domain processing method at each point. If the metal detection can not be performed even if the detection of the transmission / reception sensor 40 is performed to the maximum range that can be reached by moving the detector at the worker's standing position, the mode selection switch is changed to the frequency domain processing method using the switch (13) Detecting sites that are detected as a re-work. If the operator does not detect the metal by repeating the detection operation with the changed frequency domain processing method, it moves to the next point and repeats the operation.

If a metal is detected in the time domain processing method, it is switched to the frequency domain after the first warning and the mode switching is guided again. It analyzes the size and phase information of each measured frequency to check if there is a characteristic similar to a mine that has a high probability of being buried in the area. If there is a similarity, pay attention to the type of mine Send a strong warning, and use the screen, voice, storage media, or network connection methods to provide information that will help you with precise detection, and make sure you continue with the detection. The same procedure is used for detection of metals only in the frequency domain.

For the convenience of use, the mode changeover switch 13 described above may automatically detect the moving direction using the inertial sensor and automatically switch the mode when the moving direction is switched.

Through the combined mode operation of the above, additional detection work is performed by time domain and frequency domain processing method. In particular, by providing additional information such as the type of metal, size and posture, and whether the mine is highly buried, The reliability and safety of landmine detection can be dramatically improved.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is self-evident to those who have.

Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

10 ... control processor 11 ... control processor
12 ... External connection panel 13 ... Mode selection switch
20 ... transmission unit 21 ... transmission processing unit
22 ... Transmit output counter 1 23 ... Transmit output counter 2
30 ... Receiving unit 31 ... Receiving processing unit
32 ... Receive RF half
40 ... Transmission / reception sensor 41 ... Transmission coil 1
42 ... transmitting coil 2 43 ... receiving sensor coil
51 ... transmission output half transmission signal 52 ... transmission output half 2 transmission signal
53 ... Receive coil reception signal 54 ... Transmission reference signal
55 ... Reception processing unit control supervisory signal 56 ... transmission processing group control supervisory signal
61 ... primary magnetic field 62 by transmission coil 1 ... primary magnetic field by transmission coil 2
71 ... Radius of the transmitting coil 1 ... 72 ... Radius of the transmitting coil 2
73 ... Radius of receiving coil

Claims (8)

A metal explosive detection device comprising:
It is possible to form a concentric structure with two transmission coils and one reception coil so that only one transmission coil is used for time domain processing and two transmission coils are used for frequency domain processing, The first and second magnetic fields generated by the two transmission coils cancel each other to minimize the influence on the reception coil, and the reception coil includes a transmission / reception sensor commonly used in both time domain processing and frequency domain processing.
A transmitter for generating one output signal in case of time domain processing and two output signals in case of frequency domain processing;
A receiving unit for receiving a received signal in a time domain or a frequency domain; And
A control processor for controlling the transmitter and outputting a result of the metal explosive detection from the measurement data received by the receiver; Wherein the time-domain and frequency-domain-processed mixed-mode metal explosive detection device comprises: The method according to claim 1,
Wherein the transmission unit comprises: a transmission processing unit; And a transmission output half 1 and a transmission output half 2 driving a current according to a signal of the transmission processing unit; And,
Wherein the transmission processing unit comprises two-channel arbitrary waveform generators, a DA converter and a low-pass filter, and the outputs of the two channels are connected in a 1: 1 relationship with the transmission output half 1 and the transmission output half 2, respectively. Frequency domain processing method complex mode metal explosive detection device. 3. The method of claim 2,
In the case of the frequency domain processing method, the transmission output half 1 and the transmission output half 2 are connected to the two transmission coils 1: 1, respectively, and the transmission signals of the transmission output half 1 and the transmission output half 2 are synchronously output, Wherein the magnetic field is canceled by flowing current in opposite directions to each other. The method according to claim 1,
Wherein the control processor is provided with a mode selection switch for switching between a time domain processing method and a frequency domain processing method. The method according to claim 1,
Wherein the control processing unit includes an inertial sensor and is automatically switched to a time domain processing method and a frequency domain processing method according to a traveling direction of the transmission / reception sensor. The method according to claim 1,
When the metal explosive is detected by the time domain processing method and it is judged that there is metal, the mode is switched by the frequency domain processing method and the additional information is obtained by using the frequency-dependent size and phase information obtained by re- Time - domain and frequency - domain processing complex mode metal explosive detection system. The method according to claim 1,
It is characterized in that all the points in the detection area are detected by using the time domain processing method and the frequency domain processing method in a redundant manner and the additional information is obtained by using the frequency and magnitude and phase information obtained by the detection using the frequency domain processing method Time - domain and frequency - domain processing complex mode metal explosive detection devices. 8. The method according to claim 6 or 7,
Wherein the data is provided to the operator in addition to the additional information, if the explosive is likely to be an explosive, in comparison with the data on the explosive capable of burial.

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