MULTIPLE RECEIVER COIL METAL DETECTOR SYSTEM

TR202613835U5Pending Publication Date: 2026-09-21NOKTA MUHENDISLIK ANONIM SIRKETI
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Patent Information

Application Number
TR202613835U
Authority / Receiving Office
TR · TR
Patent Type
Utility models
Current Assignee / Owner
Filing Date
2026-08-14
Publication Date
2026-09-21
Estimated Expiration
2036-08-14

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Abstract

The invention relates to a metal detector system for discriminating depth and size information of metallic targets. The system comprises at least one transmitter coil (100) configured to generate an electromagnetic field, a first receiver coil (110) and a second receiver coil (120) of different dimensions and / or geometries, a first coil circuit (111), a second coil circuit (121), an analog-to-digital conversion unit (130), and a processing unit (140). The first receiver coil (110) and the second receiver coil (120) are electrically isolated and independently operating asymmetric receiver coils. The analog-to-digital conversion unit (130) samples the receiver signals simultaneously via the first ADC channel (131) and the second ADC channel (132) in the same measurement cycle and according to a common time reference. The processing unit (140) separates the depth and size information of the target by evaluating the different frequency components of the digital receiver signals. Figure 1
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Description

1 TARIFF MULTIPLE RECEIVER COIL METAL DETECTOR SYSTEM TECHNICAL AREA 5 The invention consists of at least one transmitter coil, made of metal, configured to generate an electromagnetic field. Generating receiver signals based on magnetic field changes originating from targets configured to include at least one primary receiver coil and at least one secondary receiver coil, receiver an analog-to-digital 10 configured to convert signals into digital receiver signals The conversion unit and digital receiver evaluate the signals to generate information about the metal target. It relates to metal detector systems that include a processing unit structured accordingly. PREVIOUS TECHNIQUE In current technology, metal detectors that operate on the principle of electromagnetic induction are generally... by generating an electromagnetic field through one or more transmitting coils and Secondary magnetic field variations resulting from currents induced in metal targets It detects through receiver coils. In such systems, the presence and location of the target are detected. Approximate size and / or target discrimination information, 20 of the signals obtained from the receiver coils. It is determined by evaluation. The coil configurations used in current detector systems are mostly for a specific detection purpose. It is optimized according to its characteristics. Larger coil arrangements are deeper. Advantage in detecting weak signals from nearby or larger volume targets 25 It can provide sufficient sensitivity, but only on small, near-surface targets. It cannot be shown. In contrast, small-sized coil arrangements are small and close to the surface. They can be more sensitive to targets, but weaker against deeper targets. It remains limited in its ability to detect signals. Therefore, the depth of field is limited in the current technique. A technical trade-off emerges between performance and the sensitivity of small targets near the surface. 30 It is emerging. Current technology utilizes different coil geometries, Double-D coil structures, and concentric coil structures. or shaping the sensing field using arrangements containing multiple coils and the aim is to achieve different target volumes. In addition, some systems have different 35 by selecting, combining or comparing the signals obtained from the coils The aim is to obtain information about the size, location, or depth of the target. 2 Together, these types of solutions reliably determine the size and depth characteristics of the target. Its separation capabilities may be limited. Specifically, a small target near the surface versus a larger target located deeper down, the receiver They can produce similar results in terms of signal strength. In this case, 5 In current technical systems, the actual size of the target and the depth of the target are not sufficiently different. It may not be possible to distinguish them with accuracy. This problem is variable in highly mineralized soils. in ground conditions or within the dense noise components of weak target signals It becomes more apparent in the applications where it is attempted to be perceived. Currently, many users have a preference for small targets over large targets. To ensure accuracy, it performs searches using multiple search terms. In addition, in current detectors, there is a direct connection between the transmitter coil and the receiver coil. Coupling, ground-induced magnetic effects, and environmental noise components reduce the target signal by 15%. This makes it difficult to interpret correctly. Therefore, in the current technique, different targets a balanced approach within the same detector structure to different sizes and target depths detection performance is ensured and the size and depth of the target are determined from the obtained signals. The need for reliable differentiation of its characteristics continues. In conclusion, all the problems mentioned above necessitate an innovation in the relevant technical field. It has made it mandatory. A BRIEF DESCRIPTION OF THE INVENTION The present invention aims to eliminate the aforementioned disadvantages and to contribute to the relevant technical field. It is related to a metal detector system, aiming to bring new advantages. One aim of the invention is to detect metallic targets located at different sizes and depths. a metal detector that allows for a more reliable evaluation of the information 30 The goal is to establish the system. Another purpose of the invention is to target small objects near the surface and larger objects located deeper down. from the targets producing similar results in terms of receiver signals A metal detector system was developed that reduces the resulting target assessment uncertainty. 35 to place. 3 Another objective of the invention is to obtain signals from receiver coils with different sensing characteristics. by enabling the evaluation of the received signals under the same measurement conditions enabling more accurate determination of the size and depth information of the target. The goal is to develop a metal detector system. Another objective of the invention is to purify weak receiving signals from noise components and to use appropriate The goal is to develop a metal detector system that enables processing by bringing it to a certain level. All the purposes mentioned above and those that will emerge from the detailed explanation below. The present invention, for the purpose of realizing this, generates an electromagnetic field. at least one structured transmitting coil, metal within the electromagnetic field in question. Generating receiver signals based on magnetic field changes originating from targets structured in such a way as to include at least one primary element with different dimensions and / or geometries. a receiver coil and at least one second receiver coil convert the receiver signals into digital receiver signals. an analog-to-digital conversion unit configured to convert and the said digital 15 structured to generate information about the metal target by evaluating receiver signals It is a metal detector system that includes a processing unit. Accordingly, the characteristic of the present invention is that the first receiver coil and the second receiver coil are separated from each other. 20 as electrically isolated and independently operating asymmetric receiver coils its configuration amplifies the receiver signal from the first receiver coil and / or a first coil circuit configured to filter and receive signals from the second receiving coil. a second coil circuit configured to amplify and / or filter the signal This includes the analog-to-digital conversion unit, which is allocated to the receiving signal from the primary receiver coil. a first ADC channel and a 25 channel dedicated to the receiver signal from the second receiver coil. It includes a second ADC channel, the first ADC channel and the second ADC channel are connected to the first receiver coil. and the receiver signals from the second receiver coil are within the same measurement cycle and a common It should be structured to sample synchronously according to the time reference, and the processing unit, simultaneously sampling digital receiver signals at different frequencies By evaluating its components, the depth information and size information of the metal target can be distinguished from each other by 30 It is structured in such a way as to separate them independently and / or simultaneously. Thus Signals obtained from different receiver coils are evaluated on the same time base. and information regarding the size and depth of the target can be more reliably transmitted from one another. Separation is ensured. 35 The characteristic of a possible configuration of the invention is the first coil circuit and the second coil circuit. Each of them is configured to amplify the receiver signal from the respective receiver coil, at a minimum. 4 a preamplifier layer and to reduce the noise components in the receiving signal It contains at least one structured filter layer. Thus, the data obtained from the receiver coils... upscaling weak analog signals to a processable level and eliminating unwanted noise. The reduction of its components is ensured. Another possible configuration of the invention features a first coil circuit and a second coil. the circuit, the weak analog receiver signals belonging to the first and second receiver coils. configured to bring it to a level applicable to the analog-to-digital conversion unit. This is the case. Thus, the sampling to be done by the analog-to-digital conversion unit. Signal quality and measurement stability are improved. 10 Another possible configuration of the invention features a first ADC channel and a second ADC. the channel is synchronized with a common sampling clock signal and / or a common trigger signal. This means that the signals obtained from different receiver coils are synchronous. This allows for exemplification and ensures that there is a time lag of 15 in the comparative evaluation. The resulting errors are reduced. Another possible configuration feature of the invention is that the analog-to-digital conversion unit, a multi-channel analog-to-digital converter including a first ADC channel and a second ADC channel It is structured in such a way that different receiver coil signals are converted into a common 20 Its architecture ensures simultaneous and harmonious digitization. Another possible configuration feature of the invention is that the analog-to-digital conversion unit, a first analog-to-digital converter forming the first ADC channel and a second ADC channel It includes a second analog-to-digital converter and the first analog-to-digital 25 according to the common time reference of the converter and the second analog-to-digital converter The reason is that they are synchronized. Thus, each receiver coil signal is transmitted to a separate converter. Despite being processed through a different method, the temporal consistency of the measurements is maintained. Another possible configuration of the invention features a processing unit that can simultaneously process 30 Signal strength, amplitude, phase information, and frequency component of the sampled digital receiver signals. and / or evaluate at least one of the demodulated signal components It is structured. Thus, the technical evaluation regarding the target is based solely on the signal. It does not depend on its existence, but targets a more comprehensive range of signals through different signal parameters. analysis can be done. 35 Another possible configuration of the invention features the processing unit operating simultaneously. The sampled digital receiver will determine the signal intensity ratio between the signals and the aforementioned the size and / or depth characteristics of the metal target depending on the signal strength ratio It is structured in such a way as to generate classification information related to the surface. 5. A distinction must be made between immediate, smaller goals and larger, deeper goals. Classification information that will be helpful is obtained. Another possible configuration of the invention involves connecting the first receiver coil to the second receiver coil. It will have a smaller detection area in comparison and micro-scale metal close to the surface. 10 that will be sensitive to magnetic field changes originating from the targets. its structure; and the fact that the second receiver coil is larger compared to the first receiver coil will have a detection area and from macro-scale metal targets located deeper. It is structured to be sensitive to the resulting magnetic field changes. Thus, different target sizes and different target depths can be achieved within the same detector structure. Complementary perception characteristics are provided. 15 Another possible configuration of the invention features a first receiver coil and a second receiver coil, within the common electromagnetic field generated by the transmitting coil and originating from the target It is positioned to be sensitive to different magnetic flux densities. Thus, by utilizing the differences in response to the same target across different receiver coils, 20 This allows for a more selective evaluation of the target characteristic. Another possible configuration of the invention features a transmitter coil, a first receiver coil, and a second... to balance the direct induced component it creates on the receiver coil It includes a balancing structure. Thus, the direct connection between the transmitter coil and the receiver coil is 25 Signal components resulting from coupling are reduced, and the target-source signal is minimized. This facilitates the evaluation of its components. Another possible configuration of the invention features a transmitter coil, a first receiver coil, and a second... This is because the receiver coil is positioned within the same search head. Thus, a single 30 Detection in terms of different target sizes and different target depths with the search title. It is possible. Another possible configuration of the invention features a transmitter coil, a first receiver coil, and a second... The receiver coil is positioned to form an asymmetrical Double-D coil geometry. This is the geometric arrangement of the receiver coils with different sensing characteristics. It is supported through [link / platform]. 6 Another possible configuration of the invention features an asymmetric Double-D coil. The overlapping region formed between the transmitting coil and the first receiving coil in the geometry of the transmitter different dimensions and / or overlapping region formed between the first coil and the second receiver coil This means that the first and second receiver coils are in different magnetic field regions. sensitivity is ensured. Another possible configuration of the invention features a first receiver coil and a second receiver coil, It will form D-shaped, oval, or elliptical winding regions that at least partially overlap with the transmitter coil. This is because they are positioned in such a way. Thus, the different 10 types of Double-D based coil geometries This can be achieved through various application methods. Another possible configuration of the invention features a transmitter coil, a first receiver coil, and a second... The receiver coil's concentric coil geometry, figure-8 coil geometry, or quad coil It is positioned in such a way as to create its geometry. Thus, the invention's different coil 15 its applicability with various geometries and its adaptability to different usage conditions is provided. Another possible configuration of the invention features a first receiver coil and a second receiver coil. In addition, at least one 20 with different detection depth and / or different target size sensitivity. It includes a third receiver coil. This allows for different detection layers or different targets. An extended receiver coil structure is obtained that provides the necessary sensitivity. Another possible configuration feature of the invention is that the analog-to-digital conversion unit, It includes a third ADC channel dedicated to the receiver signal from the third receiver coil and 25 the third ADC channel shares a common time reference with the first and second ADC channels. It is structured to perform simultaneous sampling according to the criteria. Thus, three or signals from multiple receiver coils together within the same measurement cycle An evaluation is provided. Another possible configuration of the invention features the processing unit operating simultaneously. The evaluation of the sampled digital receiver signals resulted in a close proximity to the metal target. to generate area / remote area information, target identification information and / or target discrimination information It is structured. Thus, not only the existence of the goal is revealed, but also more detailed information about the goal. Classification and differentiation information is also obtained. 35 7 Another possible configuration feature of the invention is the Very Low metal detector. With one of the following architectures: Frequency, Pulse Induction, or simultaneous multi-frequency operation. It is structured to work in a way that allows it to function differently. Thus, the invention allows different metal detectors to operate. This ensures that it can be implemented in accordance with its principles. BRIEF DESCRIPTION OF THE FIGURE Figure 1 shows a representative schematic view of the components of a metal detector. Figure 2 shows a representative view of the coils in a possible configuration. 10 Figure 3 shows a representative view of another possible coil configuration. In Figures 4a, 4b, and 4c, the receiver coils are concentric, respectively; in a Double-D configuration. and that there are 15 small double-D receivers inside a large ring-shaped receiver. It represents a structure that is... DETAILED DESCRIPTION OF THE INVENTION In this detailed explanation, the subject of the invention is not merely for the purpose of better understanding the subject, but for any other reason. This is explained with examples that will not create a limiting effect. Referring to Figure 1, the metal detector described in this invention operates on the principle of electromagnetic induction. receiver obtained from receiver coils that are operational and have different sizes and / or geometries By simultaneously digitizing the signals, depth and size information regarding the metal target is obtained. It provides a structure that enables differentiation. The metal detector has at least one transmitter coil. (100), first receiver coil (110), second receiver coil (120), first coil circuit (111), second coil circuit (121), analog-to-digital conversion unit (130), first ADC channel (131), second It includes ADC channel (132) and processing unit (140). In one application, the first coil circuit (111) consists of the transmitter coil (100) and the first receiver coil (110). It is structured in such a way as to be related. In this structure, the first coil circuit (111), It provides the connection for driving the transmitter coil (100) and from the first receiver coil (110) the incoming receiver signal to the relevant ADC channel of the analog-to-digital conversion unit (130) It works to amplify and / or filter before application. Second coil 35 circuit (121) is configured to be related to the second receiver coil (120) and the second 8 The receiver signal from the receiver coil (120) is sent to the other analog-to-digital conversion unit (130) This makes it applicable to the ADC channel. The emitter coil (100) creates an electromagnetic field in the working area of ​​the metal detector. It is structured to create 5 by the transmitter coil (100). the electromagnetic field detects conductive metal targets located within the detector's scanning area. This causes eddy currents to form. These eddy currents, the electrical and magnetic properties of the metal target, the size of the target, the target's transmitter coil (100) and the distance to the receiving coils and the magnetic field of the target’s environment It creates secondary magnetic field components depending on its characteristics. The first receiver coil is 10 (110) and the second receiving coil (120), depending on these secondary magnetic field components, the receiver It is configured to generate signals. The first receiver coil (110) and the second receiver coil (120) are electrically isolated from each other. and are configured as independently operating receiver coils. In this context, the first receiver is 15 Receiver coil (110) and second receiver coil (120), independent winding structures, connection terminals and It can include signal outputs. First receiver coil (110) and second receiver coil (120) The electrical isolation between them ensures that the receiver signal obtained from each receiver coil is independent. This allows for its evaluation in this way. Thus, the first receiver coil (110) The receiver signal produced by the first receiver coil and the receiver signal produced by the second receiver coil (120), 20 The metal target is obtained separately according to its different detection characteristics and processed by the unit. (140) can be evaluated comparatively. The first receiver coil (110) and the second receiver coil (120) are asymmetric receiver coils. It is structured. Here, the asymmetric structure is between the first receiver coil (110) and the second receiver coil 25 (120) different sizes, geometries, winding areas, sensing areas, magnetic flux densities This refers to having sensitivity and / or target distance sensitivity. See Figure 2. In one application, the first receiver coil (110) is smaller compared to the second receiver coil (120). It is structured to be three-dimensional. In this case, the first receiver coil (110) is placed on the surface. Magnetic field variations caused by nearby micro-scale metal targets 30 It can show higher sensitivity. The second receiver coil (120) is the same as the first receiver coil. (110) is structured to be larger in size and deeper than (110). weak magnetic field variations originating from macro-scale metal targets found It is being made suitable for perception. 35 The first receiving coil (110) and the second receiving coil (120) are formed by the transmitting coil (100). Sensitive to regions of different magnetic flux densities within a common electromagnetic field. 9 It can be positioned in such a way as to be. Thanks to this structure, the first receiver coil (110) and second receiver coil (120), different receiver responses to the same metal target It can produce. The first receiver when the metal is close to the target surface and small in size. The receiving signal obtained from coil (110) is converted to the receiving signal obtained from the second receiving coil (120). It can be more dominant compared to others. The metal target is deeper and larger in size. 5 When this happens, the receiver signal obtained from the second receiver coil (120) is compared to the first receiver coil (110) The resulting receiver signal can become more dominant compared to the original signal. This differs in response. Its characteristic is based on the processing unit (140) parsing the depth and dimension information of the target. It constitutes. The first receiver coil (110) is associated with the first coil circuit (111). The first coil circuit (111) to amplify and / or filter the receiving signal from the first receiving coil (110) It is structured as follows: The second receiver coil (120) is connected to the second coil circuit (121). It is related to the second coil circuit (121), the receiver signal from the second receiver coil (120). It is configured to amplify and / or filter. First coil circuit (111) and 15 The second coil circuit (121) converts the weak analog receiver signals from the relevant receiver coils into analog- It ensures that the digital conversion unit (130) is brought to a level where it can be applied. In one application, the first coil circuit (111) receives the analog receiver from the first receiving coil (110). at least one preamplifier layer configured to amplify the signal and the aforementioned 20 at least one of the analog receivers configured to reduce noise components within the signal It includes a filter layer. Similarly, the second coil circuit (121) consists of the second receiver coil. (120) at least one preamplifier configured to amplify the incoming analog receiver signal layer and to reduce noise components within the analog receiver signal in question It includes at least one structured filter layer. Preamplifier layers, receiver 25 raising the low-amplitude signals obtained from the coils to a processable level It provides this. The filter layers, on the other hand, filter out environmental electromagnetic noise and high-frequency waves. reducing interference, low-frequency drift, and unwanted signal components It serves. Analog-to-digital conversion unit (130), from the first receiver coil (110) and the second receiver coil (120) is configured to convert incoming receiver signals into digital receiver signals. Analog-to-digital conversion unit (130) is allocated to the receiving signal from the first receiving coil (110). a first ADC channel (131) and allocated to the receiver signal from the second receiver coil (120) It includes a second ADC channel (132). The first ADC channel (131) is connected to the first coil 35 The second circuit samples the receiver signal which has been amplified and / or filtered by (111). The ADC channel (132) is amplified and / or filtered by the second coil circuit (121). The receiver is sampling the signal. The first ADC channel (131) and the second ADC channel (132) are in the same measurement cycle and are common 5 that will perform simultaneous sampling according to a time reference. It is structured as a common time reference, a common sampling clock signal, common trigger signal, common control signal or provided by the processing unit (140) It can be generated with a timing signal. In this way, the signal from the first receiver coil (110) The receiver signal from the second receiver coil (120) and the receiver signal from the metal target have the same physical 10 comparable digital samples in terms of location and the same measurement cycle It is being converted. Simultaneous sampling is performed from the scanning movement of the detector head, the relative position change of the target or time-dependent changes in ground conditions This helps to reduce measurement discrepancies that may arise from changes. In one application, the analog-to-digital conversion unit (130), the first ADC channel (131) and the second 15 as a multi-channel analog-to-digital converter that incorporates the ADC channel (132). is configured. In this case, the first ADC channel (131) and the second ADC channel (132) are the same. It operates within an analog-to-digital converter architecture using a common timing structure. In an alternative application, the analog-to-digital conversion unit (130) uses the first ADC channel (131) a first analog-to-digital converter and a 20 forming the second ADC channel (132) It includes a second analog-to-digital converter. In this case, the analog-to-digital converter in question... The converters are synchronized according to a common time reference and are simultaneous. It is operated in a way that will provide sampling. The processing unit (140) receives the digital receiver signals from the analog-to-digital conversion unit (130). It is structured to evaluate. The processing unit (140) is structured simultaneously. By evaluating the different frequency components of the sampled digital receiver signals, the metal target can be identified. Depth information and dimension information independently and / or simultaneously It separates. In this context, the processing unit (140) obtains through the first ADC channel (131). The digital receiver signal obtained via the second ADC channel (132) and the digital receiver signal obtained via the second ADC channel 30 It operates comparatively. The processing unit (140) transmits the digital receiver signal of the first receiver coil (110) to the second receiver coil (120) The digital receiver contains signal strength, amplitude, phase information, frequency component, and demodulation data. It can make comparisons in terms of the generated signal components and / or their ratios. 35 In one application, the processing unit (140) is the digital receiver obtained from the first receiver coil (110). the signal strength of the signal and the digital receiver signal obtained from the second receiver coil (120) 11 It determines the ratio between the intensities. This ratio is determined by the proximity of the metal target to the surface. Is it a small target, a larger target located deeper, or an intermediate dimension / depth? It is used to determine whether it is a target belonging to its class. In one example study, a metal detector can detect a micro-scale metal near the surface. When the target is scanned, the amplitude of the receiver signal obtained from the first receiver coil (110) or the signal Its intensity may be higher than the receiver signal obtained from the second receiver coil (120). The processing unit (140) evaluates this signal distribution and determines that the target is close to the surface and small. This indicates a high probability of it being three-dimensional. Another example study. In this case, when a deeper, macro-scale metal target is scanned, the second receiver 10 The amplitude or signal strength of the receiving signal obtained from the coil (120) is the signal obtained from the first receiving coil. (110) may be more dominant than the received receiver signal. The processing unit (140), this in this case, the target is likely to be deeper and larger in size. It determines. The processing unit (140) also processes different frequency components as well as the signal strength ratio. It can evaluate the size, conductivity, magnetic properties, and depth of the metal target. It can affect the frequency content of the receiver signals. Therefore, the processing unit (140), first different frequencies of receiver signals from the receiver coil (110) and the second receiver coil (120) By analyzing the relationship between the components, the depth information and dimension information of the target are determined. 20 It differentiates. This differentiation is limited to merely identifying the presence of the target. not remaining, but producing richer classification information regarding the target. It provides. In one application, the processing unit (140) extracts 25 of the simultaneously sampled digital receiver signals. It produces near field / far field information. More dominant by the first receiver coil (110). The perceived targets can be evaluated as near field targets, second receiver coil (120) Targets that are perceived as more dominant by this are distant field or deep targets. It can be evaluated. In another application, the processing unit (140), target identification information and / or generates target identification information. In this context, the processing unit (140) has 30 different receivers. amplitude, frequency and / or phase of simultaneously sampled signals from the coils using its characteristics, the type, size, depth, or discrimination class of the metal target can be determined. It can provide related output. Transmitter coil (100), first receiver coil (110) and second receiver coil (120) are all in the same search head 35 It can be positioned inside. The search coil is positioned during the metal detector's scanning process. It constitutes the part that is moved across the ground or target area. The same search... 12 transmitter coil (100), first receiver coil (110) and second receiver coil located within the head (120), for different target sizes and different target depths during a single scanning motion. It provides adaptive detection performance. Thus, the user can both use the same search title and both small targets near the surface and larger targets located deeper down. It is able to perceive. 5 The transmission coil (100) creates on the first receiver coil (110) and the second receiver coil (120) a balancing structure for balancing the direct induction component This can be provided. The balancing structure in question is provided by the transmitter coil (100) to the first receiver. The voltage component directly induced on coil (110) and the second receiving coil (120) is 10 It is configured to reduce or bring close to zero the current from the receiver coils. The influence of components arising from direct transmitter-receiver coupling on the obtained signals. is being reduced and the secondary magnetic field components originating from metal targets are further minimized. This ensures that the evaluation is carried out with high accuracy. In an application referencing Figure 3, the metal detector is placed on opposite sides of the transmitter coil (100). multiple small receiver coils and multiple large receiver coils positioned It can include. In this configuration, small receiver coils form the transmitter coil (100). originating from near-surface and micro-scale targets within an electromagnetic field. To be sensitive to magnetic field changes; large receiver coils are located even deeper, 20 weak magnetic field variations resulting from macro-scale targets They are positioned to be sensitive. Small receiver coils and large receivers. The receiver signals obtained from the coils are converted to analog-to-digital signals via the respective coil circuits. The size of the target is applied to the conversion unit (130) and processed by the processing unit (140). and / or is used in determining depth characteristics. 25 In an alternative application as shown in Figure 4a, the transmitter coil (100), the first receiver coil (110) and The second receiver coil (120) will form a concentric coil geometry. can be positioned. In this case, the first receiver coil (110) and the second receiver coil (120), 30 with the same or similar to transmitter coil (100) having different diameters or radii. They can be arranged around the central axes. In another application, the transmitter coil (100), First receiver coil (110) and second receiver coil (120), figure-8 (figure 8) coil geometry It can be positioned to form. In another application, the transmitter coil (100), two first receiver coils (110) connected in series with different dimensions and two second receiver coils connected in series with different dimensions The receiver coil (120) can be arranged to form a quad coil geometry. This 35 In alternative geometries, the first receiver coil (110) and the second receiver coil (120) have different sensing capabilities. It is designed to have these characteristics. 13 In an application like the one in Figure 4b, the transmitter coil (100), the first receiver coil (110) and the second receiver The coil (120) is positioned to form a Double-D coil geometry. In the Double-D coil geometry, the transmitter coil (100), the first receiver coil (110) and the second receiver Coil (120) D-shaped, oval or elliptical winding regions that partially overlap each other 5 It can be formed by the first receiver coil (110) and the second receiver coil (120), together with the transmitter coil (100). They can be positioned to create overlapping zones of varying sizes and / or locations. These different overlapping regions are different for the first receiver coil (110) and the second receiver coil (120). This ensures that it is sensitive to magnetic flux densities. In the asymmetric Double-D coil geometry, the first receiver coil (110) is located near the surface micro In a specific overlapping relationship with the transmitter coil (100) in such a way as to be sensitive to scaled targets It can be positioned. The second receiver coil (120) is located deeper and on a macro scale. A wider detection range suitable for detecting weak signals from targets. It can be positioned in a way that provides the area. Thus, the asymmetric Double-D geometry, 15 There is a difference in target size and difference between the first receiver coil (110) and the second receiver coil (120). It creates a complementary perception structure in terms of target depth. In another application of the invention, the metal detector consists of a first receiver coil (110) and a second receiver. In addition to the main coil (120), it may include at least one third receiving coil. The third receiving coil, 20 Different detection depth from the first receiver coil (110) and the second receiver coil (120), different target size sensitivity, sensitivity to different magnetic flux densities and / or different frequency response It can be configured to provide this. In this case, the analog-to-digital conversion unit (130), a third ADC channel dedicated to the receiver signal from the third receiver coil. can include the third ADC channel, the first ADC channel (131) and the second ADC 25 In order to perform simultaneous sampling with channel (132) according to common time reference It can be configured in a hierarchical manner, thus containing three or more receiver coils. A sensing structure can be provided. In an application like the one in Figure 4c, a large receiver coil Two double D receiver coils can be provided at the center. The metal detector will operate using a Very Low Frequency operating architecture. It can be configured. In this case, the transmitter coil (100) is a low-frequency continuous or It is driven by a periodic excitation signal and from the first receiver coil (110) and the second receiver coil (120) Phase, amplitude and / or frequency components of the received receiver signals processing unit (140) It is evaluated by. Alternatively, a metal detector, Pulse Induction operation 35 It can be configured to work with its architecture. In this case, the transmitter coil (100), It is operated with pulsed excitation signals and the time domain obtained from the receiver coils. 14 The responses are being evaluated. In another application, a metal detector simultaneously detects multiple It can be configured to work with frequency operating architecture and the processing unit (140), Simultaneously sampled digital from the first receiver coil (110) and the second receiver coil (120) The receiver analyzes the signals through different frequency components. Within the scope of this invention, it is possible for the first and second receiver coils to have different sizes. It constitutes one of the applications, with different sensing characteristics and coil geometry. winding area, number of windings, coil position, coil overlap amount, coil axis, coil plane, position of the receiving coils relative to the transmitting coil (100) or combinations thereof It can be provided. The first coil circuit (111) and the second coil circuit (121) are 10 receiver coils. It will have appropriate signal amplification and filtering characteristics according to its relevant features. It can be arranged as follows: Analog-to-digital conversion unit (130) and processing unit (140), This makes it possible to compare the signals from the receiver coils within the same measurement cycle. It operates synchronously in a way that will make it possible. Thanks to this design, the metal detector can detect different target sizes within a single search coil. and can perform simultaneous detection for different target depths. First receiver coil (110) and signals from the second receiver coil (120) are simultaneously transmitted through separate ADC channels. This sampling allows the responses generated by the target in different receiver coils to be seen simultaneously. It ensures that it is evaluated on the basis of the processing unit (140), the aforementioned 20 simultaneous By evaluating digital data, it is possible to distinguish between the depth information and the size information of a metal target. It separates independently and / or simultaneously. Therefore, the invention applies both near the surface. Both small targets and large, deep-seated targets can be detected within the same detector system. This allows for more reliable detection and classification. The scope of protection of the invention is specified in the claims attached hereto, and these details are strictly adhered to. The explanation cannot be limited to those given for illustrative purposes. Because a technically skilled person... the person, without deviating from the main theme of the invention, in light of what has been described above, similar It is clear that these structures can emerge. REFERENCE NUMBERS GIVEN IN THE FIGURE 100 Transmitter coils 110 First receiver coil 111 First coil circuit 5 120 Second receiver coil 121 Second coil circuit 130 Analog-to-digital conversion units 131 First ADC channel 132 Second ADC channel 10 140 Transaction units

Claims

16 REQUESTS 1. At least one transmitter coil (100) configured to generate an electromagnetic field. originating from metal targets within the electromagnetic field in question 5 to generate receiver signals depending on magnetic field changes structured, at least one first with different dimensions and / or geometry receiver coil (110) and at least one second receiver coil (120) digitally transmit the receiver signals in question. an analog-to-digital converter configured to convert receiving signals unit (130) and by evaluating the said digital receiver signals, regarding the metal target a metal detector containing a processing unit (140) structured to generate information 10 Its characteristic is; - the first receiving coil (110) and the second receiving coil (120) are electrically separated from each other. configured to produce isolated and separate receiving signals being, - to amplify and / or filter the receiver signal from the first receiver coil (110) 15 a first coil circuit (111) and a second receiver coil (120) are structured to a secondary receiver configured to amplify and / or filter the incoming signal containing a coil circuit (121), - analog-digital conversion unit (130), receiver from first receiver coil (110) 20 from the first ADC channel (131) and the second receiver coil (120) dedicated to the signal. It includes a second ADC channel (132) dedicated to the incoming receiver signal, - the first ADC channel (131) and the second ADC channel (132), from the first receiver coil (110) and the receiver signals from the second receiver coil (120) are in the same measurement cycle. will sample simultaneously within and according to a common time reference. the fact that it is structured in this way, 25 - and the processing unit (140), the digital receiver signals sampled simultaneously By evaluating different frequency components, depth and size information of the metal target can be determined. in a way that separates its information independently and / or simultaneously It is structured.

2. It is a metal detector according to claim 1, and its feature is; first coil circuit (111) and Each of the second coil circuits (121) can be connected to the corresponding first receiver coil (110) or the second at least one configured to amplify the receiver signal from the receiver coil (120) preamplifier layer and reducing noise components in the receiving signal It must contain at least one filter layer structured accordingly. 35 17 3. A metal detector according to claim 1 or 2, whose feature is; first coil circuit (111) and the second coil circuit (121), to the relevant first receiver coil (110) and to the second receiver coil (120) weak analog receiver signals to the analog-digital conversion unit (130) It is structured in a way that will bring it to a usable level.

4. It is a metal detector according to any of the previous requirements, and its feature is; firstly; ADC channel (131) and second ADC channel (132) share a common sampling clock signal. and / or being synchronized with a common trigger signal.

5. A metal detector according to any of the previous requirements, with the following specifications: analog-10 digital conversion unit (130), first ADC channel (131) and second ADC channel (132) configured as a multi-channel analog-to-digital converter It is the fact that.

6. A metal detector according to any of claims 1 to 4, with the specification of analog-15. The first digital conversion unit (130) forms the first ADC channel (131). analog-to-digital converter and a second analog-to-digital converter forming the second ADC channel (132) it includes a digital converter and with the first analog-to-digital converter in question synchronized according to the common time reference of the second analog-to-digital converter. It is the fact that it has been done. 20 7. A metal detector according to any of the previous requirements, whose feature is; operation The signal strength of the unit (140), of the digital receiver signals sampled simultaneously, from amplitude, phase information, frequency component and / or demodulated signal components It is structured in such a way as to evaluate at least one of them. 25 8. A metal detector according to any of the previous requirements, whose feature is; operation unit (140), signal between the digital receiver signals sampled simultaneously will determine the intensity ratio and the metal depending on that signal intensity ratio. Classification information regarding the size and / or depth characteristics of the target 30 It is structured in a way that will produce it.

9. It is a metal detector according to any of the previous requirements, and its feature is; firstly; the receiver coil (110) has a smaller sensing area compared to the second receiver coil (120). will have and 35 originating from micro-scale metal targets near the surface. second The receiver coil (120) has a greater detection capacity compared to the first receiver coil (110). will have an area and macro-scale metal targets located deeper. 18 structured to be sensitive to resulting magnetic field changes It is the fact that.

10. A metal detector according to any of the previous requirements, and its feature is; first receiver coil (110) and second receiver coil (120) are connected by transmitter coil (100) 5 Different magnetic fields are created within the common electromagnetic field originating from the target. It is positioned to be sensitive to flux densities.

11. A metal detector according to any of the previous requirements, whose feature is; transmitter. 10 on coil (100), first receiver coil (110) and second receiver coil (120) a balancing act aimed at offsetting the direct induction component it creates It contains a structure.

12. A metal detector according to any of the previous requirements, whose feature is; transmitter. coil (100), first receiver coil (110) and second receiver coil (120) with the same search head 15 It is located within it.

13. A metal detector according to any of the previous requirements, whose feature is; transmitter. coil (100), first receiver coil (110) and second receiver coil (120) asymmetric Double-D It is positioned in such a way as to form the coil geometry. 20 14. A metal detector according to claim 13, characterized by its asymmetrical Double-D coil. formed between the transmitter coil (100) and the first receiver coil (110) in its geometry the overlap area formed between the transmitter coil (100) and the second receiver coil (120) It is the difference in size and / or location from the overlapping region. 25 15. A metal detector according to claim 13 or 14, whose characteristic is; first receiving coil (110) and the second receiver coil (120) is D-shaped, at least partially overlapping with the transmitter coil (100), The bandages are positioned to create oval or elliptical bandage areas.

16. A metal detector according to any of claims 1 to 12, whose characteristic is; transmitter. coil (100), first receiving coil (110) and concentric coil of the second receiving coil (120) its geometry will create either figure-8 coil geometry or quad coil geometry It is positioned in this way. 35 17. It is a metal detector according to any of the previous requirements, and its feature is; firstly; In addition to the receiver coil (110) and the second receiver coil (120), different detection depths and / or at least a third receiver coil with different target size sensitivity. It includes. 19 18. It is a metal detector according to claim 17, and its feature is analog-to-digital conversion. unit (130) has a third unit dedicated to the receiving signal from the third receiving coil. It includes an ADC channel and the third ADC channel is the first ADC channel (131) and the second It will perform simultaneous sampling with common time reference with ADC channel (132). It is structured in this way. 5 19. A metal detector according to any of the previous requirements, whose feature is; operation unit (140), digital receiver signals sampled simultaneously As a result of the evaluation, near-field / far-field information regarding the metal target, target 10 configured to generate identification information and / or target identification information It is the fact that.

20. A metal detector according to any of the previous requirements, whose feature is; metal the detector uses Very Low Frequency, Pulse Induction or simultaneous multi-frequency. It is configured to work with one of the operating architectures. 15