阅读说明：本技术 一种水下主动电磁探测作用距离的陆上测试方法 (Land test method for underwater active electromagnetic detection action distance ) 是由 谭思炜 王鹏 张静远 唐波 张林森 陆泽平 于 2020-12-10 设计创作，主要内容包括：本发明公开了一种水下主动电磁探测作用距离的陆上测试方法,包括如下步骤；S1,将电磁接收传感器放置于待测目标系统的电磁发射天线的一定距离范围内；S2,将目标信号模拟线圈放置于待测目标系统的电磁接收天线的一定距离范围内；S3,启动待测目标系统,电磁接收传感器感应得到待测目标系统的辐射电磁场,并计算得到待测目标系统的辐射磁矩；S4,利用步骤S3中得到的辐射磁矩,建立被探测目标的等效反射电磁场强度与作用距离之间的关系式；S5,利用步骤S4中得到的关系式,进一步建立目标信号模拟线圈的驱动电流与作用距离之间的关系式；S6,找到驱动电流的最小值,并根据步骤S5中得到的关系式计算得到驱动电流最小值所对应的作用距离。(The invention discloses a land test method for underwater active electromagnetic detection action distance, which comprises the following steps of; s1, placing the electromagnetic receiving sensor in a certain distance range of an electromagnetic transmitting antenna of the target system to be measured; s2, placing the target signal simulation coil in a certain distance range of an electromagnetic receiving antenna of the target system to be tested; s3, starting the target system to be detected, inducing by the electromagnetic receiving sensor to obtain a radiation electromagnetic field of the target system to be detected, and calculating to obtain a radiation magnetic moment of the target system to be detected; s4, establishing a relational expression between the equivalent reflected electromagnetic field intensity of the detected target and the action distance by using the radiation magnetic moment obtained in the step S3; s5, further establishing a relational expression between the driving current and the acting distance of the target signal simulation coil by using the relational expression obtained in the step S4; s6, finding out the minimum value of the driving current, and calculating the action distance corresponding to the minimum value of the driving current according to the relational expression obtained in the step S5.)

1. A land test method for underwater active electromagnetic detection action distance is characterized by comprising the following steps;

s1, placing the electromagnetic receiving sensor in a certain distance range of an electromagnetic transmitting antenna of the target system to be measured;

s2, placing the target signal simulation coil in a certain distance range of an electromagnetic receiving antenna of the target system to be tested;

s3, starting the target system to be detected, inducing by the electromagnetic receiving sensor to obtain a radiation electromagnetic field of the target system to be detected, and calculating to obtain a radiation magnetic moment of the target system to be detected;

s4, establishing a relational expression between the equivalent reflected electromagnetic field intensity of the detected target and the action distance by using the radiation magnetic moment obtained in the step S3;

s5, further establishing a relational expression between the driving current and the acting distance of the target signal simulation coil by using the relational expression obtained in the step S4;

and S6, adjusting the magnitude of the driving current of the target signal simulation coil, finding the minimum value of the driving current under the condition that the target system to be detected can reliably detect the target, and calculating the action distance corresponding to the minimum value of the driving current according to the relational expression obtained in the step S5.

2. The land test method for underwater active electromagnetic surveying range of claim 1, wherein in step S1, a position parameter (z) of the electromagnetic receiving sensor relative to the electromagnetic transmitting antenna of the target system to be surveyed is also obtained₁,r₁) The position parameter is a position parameter under a cylindrical coordinate system by taking the equivalent center of the electromagnetic transmitting antenna of the target system to be measured as the center of a circle, and the axial line of the electromagnetic receiving sensor is parallel to or perpendicular to the axial line of the electromagnetic transmitting antenna of the target system to be measured;

in step S2, a position parameter (z) of the electromagnetic receiving antenna of the target system to be measured relative to the target signal simulation coil is also obtained₂,r₂) The position parameter is the position parameter under a cylindrical coordinate system by taking the equivalent center of the target signal simulation coil as the center of a circle, and the axis of the target signal simulation coil is parallel to the axis of an electromagnetic receiving antenna of the target measuring system.

3. The onshore test method for underwater active electromagnetic detection range as claimed in claim 2, wherein in step S3, the amplitude e of the output voltage of the electromagnetic receiving sensor is measured, and then the radiation magnetic moment M of the target system to be tested is calculated according to the following formula (1) or formula (2)₁If the axis of the electromagnetic receiving sensor is parallel to the axis of the electromagnetic transmitting antenna of the target measuring system, the formula (1) is adopted, and if the axis of the electromagnetic receiving sensor is perpendicular to the axis of the electromagnetic transmitting antenna of the target measuring system, the formula (2) is adopted;

wherein M is₁Representing the radiated magnetic moment, mu, of the target system to be measured₀Is a vacuum permeability, mu_TIs the equivalent permeability, S, of the iron core of the electromagnetic receiving sensor₁Is the cross-sectional area of the coil of the electromagnetic receiving sensor, N₁Is the number of coil turns, omega, of the electromagnetic receiving sensor₀Is the electromagnetic wave frequency.

4. The method for onshore measurement of active underwater electromagnetic surveying range as claimed in claim 3, wherein in step S4, the equivalent reflected electromagnetic field strength H of the target to be surveyed is established₁The relationship with the action distance h is as follows:

wherein a is the central distance between the transmitting antenna and the receiving antenna of the target system to be measured, K_zIs attenuation coefficient of seawater medium, K_zrCharacteristic coefficient of ferromagnetic material, K, for the object to be detected_kFor equivalent scale coefficients of the object to be detected, K_tThe delay time coefficient of the target system to be measured.

5. The method for onshore measurement of underwater active electromagnetic survey range of claim 4 wherein in step S5 the established target signal simulates the drive current I of the coil₁The relationship with the action distance h is as follows:

wherein, mu_dSimulating the core permeability, S, of the coil for a target signal₂Simulating the cross-sectional area, N, of the coil for the target signal₂The number of turns of the coil is simulated for the target signal.

6. According to claimThe onshore test method for underwater active electromagnetic survey of range as claimed in claim 5, wherein in step S6, the driving current I of the target signal simulation coil is adjusted₁To find the minimum value I of the driving current under the condition that the target system to be detected can reliably detect the target_1minAnd calculating according to the formula (4) to obtain the corresponding action distance h.

Technical Field

The invention relates to the field of electromagnetic detection, in particular to a land test method for underwater active electromagnetic detection action distance.

Background

The underwater active electromagnetic detection technology is used for detecting ferromagnetic objects within a certain distance range by using the transmission and reflection characteristics of electromagnetic waves in seawater. The technology can be applied to the military field and the civil field, such as sunken ship salvage or underwater buried metal detection and the like. The action distance is one of important indexes of an underwater active electromagnetic detection technology, and means the maximum distance capable of detecting a specific target, and the index is related to not only the electromagnetic radiation magnetic moment of an active electromagnetic detection system, but also the scale characteristic of a ferromagnetic target to be detected. The transmission and reflection characteristics of electromagnetic waves in seawater are greatly different from those in air due to the conductivity of the seawater medium. Therefore, it is difficult to obtain a test effect consistent with that of seawater by directly using the ferromagnetic target on land, and the typical target scale feature types aimed at in the land test are very limited, so that a more comprehensive performance index test result cannot be obtained. In addition, the test in seawater is difficult to implement, and the problem of limited scale feature types of the target to be tested also exists.

Disclosure of Invention

In order to solve the problems in the background art, the present invention provides a land test method for active underwater electromagnetic detection of range.

In order to achieve the purpose, the invention adopts the technical scheme that:

a land test method for underwater active electromagnetic detection action distance comprises the following steps;

s1, placing the electromagnetic receiving sensor in a certain distance range of an electromagnetic transmitting antenna of the target system to be measured;

s2, placing the target signal simulation coil in a certain distance range of an electromagnetic receiving antenna of the target system to be tested;

s3, starting the target system to be detected, inducing by the electromagnetic receiving sensor to obtain a radiation electromagnetic field of the target system to be detected, and calculating to obtain a radiation magnetic moment of the target system to be detected;

s4, establishing a relational expression between the equivalent reflected electromagnetic field intensity of the detected target and the action distance by using the radiation magnetic moment obtained in the step S3;

s5, further establishing a relational expression between the driving current and the acting distance of the target signal simulation coil by using the relational expression obtained in the step S4;

and S6, adjusting the magnitude of the driving current of the target signal simulation coil, finding the minimum value of the driving current under the condition that the target system to be detected can reliably detect the target, and calculating the action distance corresponding to the minimum value of the driving current according to the relational expression obtained in the step S5.

In some embodiments, in step S1, a position parameter (z) of the electromagnetic receiving sensor relative to the electromagnetic transmitting antenna of the target system to be measured is also obtained₁,r₁) The position parameter is a position parameter under a cylindrical coordinate system by taking the equivalent center of the electromagnetic transmitting antenna of the target system to be measured as the center of a circle, and the axial line of the electromagnetic receiving sensor is parallel to or perpendicular to the axial line of the electromagnetic transmitting antenna of the target system to be measured;

in step S2, a position parameter (z) of the electromagnetic receiving antenna of the target system to be measured relative to the target signal simulation coil is also obtained₂,r₂) The position parameter is the position parameter under a cylindrical coordinate system by taking the equivalent center of the target signal simulation coil as the center of a circle, and the axis of the target signal simulation coil is parallel to the axis of an electromagnetic receiving antenna of the target measuring system.

In some embodiments, in step S3, the amplitude e of the output voltage of the electromagnetic receiving sensor is measured, and then the radiation magnetic moment M of the target system to be measured is calculated according to the following formula (1) or formula (2)₁Wherein, if the axis of the electromagnetic receiving sensor is parallel to the axis of the electromagnetic transmitting antenna of the target system, the formula (1) is adopted, ifThe axis of the electromagnetic receiving sensor is vertical to the axis of the electromagnetic transmitting antenna of the target measuring system, and the formula (2) is adopted;

wherein M is₁Representing the radiated magnetic moment, mu, of the target system to be measured₀Is a vacuum permeability, mu_TIs the equivalent permeability, S, of the iron core of the electromagnetic receiving sensor₁Is the cross-sectional area of the coil of the electromagnetic receiving sensor, N₁Is the number of coil turns, omega, of the electromagnetic receiving sensor₀Is the electromagnetic wave frequency.

In some embodiments, the established equivalent reflected electromagnetic field strength H of the detected object in step S4₁The relationship with the action distance h is as follows:

wherein a is the central distance between the transmitting antenna and the receiving antenna of the target system to be measured, K_zIs attenuation coefficient of seawater medium, K_zrCharacteristic coefficient of ferromagnetic material, K, for the object to be detected_kFor equivalent scale coefficients of the object to be detected, K_tThe delay time coefficient of the target system to be measured.

In some embodiments, the established target signal simulates the driving current I of the coil in step S5₁The relationship with the action distance h is as follows:

wherein, mu_dIron core conductor for simulating coil for target signalMagnetic rate, S₂Simulating the cross-sectional area, N, of the coil for the target signal₂The number of turns of the coil is simulated for the target signal.

In some embodiments, in step S6, the driving current I of the target signal analog coil is adjusted₁To find the minimum value I of the driving current under the condition that the target system to be detected can reliably detect the target_1minAnd calculating according to the formula (4) to obtain the corresponding action distance h.

Compared with the prior art, the invention has the beneficial effects that:

the onshore test method for the underwater active electromagnetic detection action distance has the advantages that the test scheme is low in implementation difficulty, the steps are simple, the onshore test method is easy to implement, and the cost of manpower and material resources consumed in the test process is low; the difference between a seawater medium and an air medium is considered, attenuation parameter correction is added to the test model, and the test result is more accurate and credible; the test method provides a certain implementation scheme flexibility, can adapt to the actual test requirements of the target system to be tested in different places and different structure types, and the test model can better adapt to the scale characteristics of multiple types of targets to be tested, so that the test method can meet the requirement of the acting distance index test of underwater active electromagnetic detection systems with different functions or purposes, and has wide applicability.

Drawings

FIG. 1 is a schematic diagram of a land test method for underwater active electromagnetic detection of range according to the present invention.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the following description further explains how the invention is implemented by combining the attached drawings and the detailed implementation modes.

As shown in FIG. 1, the invention provides a land test method for underwater active electromagnetic detection range, which comprises the following steps;

s1, placing the electromagnetic receiving sensor in a certain distance range of an electromagnetic transmitting antenna of a target system to be tested (namely, an underwater active electromagnetic detection system to be tested);

s2, placing the target signal simulation coil in a certain distance range of an electromagnetic receiving antenna of the target system to be tested;

s3, starting the target system to be detected to enable the target system to be detected to be in a normal working state, stably emitting and detecting electromagnetic waves, obtaining a radiation electromagnetic field of the target system to be detected through induction of the electromagnetic receiving sensor, and obtaining a radiation magnetic moment of the target system to be detected through calculation;

s4, establishing a relational expression between the equivalent reflected electromagnetic field intensity of the detected target and the action distance by using the radiation magnetic moment obtained in the step S3;

s5, further establishing a relational expression between the driving current and the acting distance of the target signal simulation coil by using the relational expression obtained in the step S4;

and S6, adjusting the magnitude of the driving current of the target signal simulation coil, finding the minimum value of the driving current under the condition that the target system to be detected can reliably detect the target, and calculating the action distance corresponding to the minimum value of the driving current according to the relational expression obtained in the step S5.

Further, in step S1, a position parameter (z) of the electromagnetic receiving sensor relative to the electromagnetic transmitting antenna of the target system to be measured is also obtained₁,r₁) The position parameter is a position parameter under a cylindrical coordinate system by taking the equivalent center of the electromagnetic transmitting antenna of the target system to be measured as the center of a circle, and the axial line of the electromagnetic receiving sensor is parallel to or perpendicular to the axial line of the electromagnetic transmitting antenna of the target system to be measured;

in step S2, a position parameter (z) of the electromagnetic receiving antenna of the target system to be measured relative to the target signal simulation coil is also obtained₂,r₂) The position parameter is the position parameter under a cylindrical coordinate system by taking the equivalent center of the target signal simulation coil as the center of a circle, and the axis of the target signal simulation coil is parallel to the axis of an electromagnetic receiving antenna of the target measuring system.

Further, in step S3, the amplitude e of the output voltage of the electromagnetic receiving sensor is measured, and then the voltage is calculated according to the following formula (1) or formula (2)Calculating to obtain the radiation magnetic moment M of the target system to be measured₁If the axis of the electromagnetic receiving sensor is parallel to the axis of the electromagnetic transmitting antenna of the target measuring system, the formula (1) is adopted, and if the axis of the electromagnetic receiving sensor is perpendicular to the axis of the electromagnetic transmitting antenna of the target measuring system, the formula (2) is adopted;

wherein M is₁Representing the radiated magnetic moment, mu, of the target system to be measured₀Is a vacuum permeability, mu_TIs the equivalent permeability, S, of the iron core of the electromagnetic receiving sensor₁Is the cross-sectional area of the coil of the electromagnetic receiving sensor, N₁Is the number of coil turns, omega, of the electromagnetic receiving sensor₀Is the electromagnetic wave frequency.

Further, in step S4, the established equivalent reflected electromagnetic field strength H of the detected object₁The relationship with the action distance h is as follows:

wherein a is the central distance between the transmitting antenna and the receiving antenna of the target system to be measured, K_zIs attenuation coefficient of seawater medium, K_zrCharacteristic coefficient of ferromagnetic material, K, for the object to be detected_kFor equivalent scale coefficients of the object to be detected, K_tThe delay time coefficient of the target system to be measured.

Further, in step S5, the established target signal simulates the driving current I of the coil₁The relationship with the action distance h is as follows:

wherein, mu_dSimulating the core permeability, S, of the coil for a target signal₂Simulating the cross-sectional area, N, of the coil for the target signal₂The number of turns of the coil is simulated for the target signal.

Further, in step S6, the drive current I of the target signal simulation coil is adjusted₁To find the minimum value I of the driving current under the condition that the target system to be detected can reliably detect the target_1minAnd calculating according to the formula (4) to obtain the corresponding action distance h.

In a specific embodiment, the situation when the land test method for underwater active electromagnetic detection range provided by the present invention is used for testing is shown in fig. 1, where the electromagnetic receiving sensor 1, the target signal simulation coil 2, the electromagnetic receiving antenna 3 of the target system 5 to be tested, and the electromagnetic transmitting antenna 4 of the target system 5 to be tested are respectively arranged in the manner shown in the figure, and preferably, the position parameter z is taken₁＝1m，r₁＝0；z₂＝0，r₂0.3 m. In actual operation, the standard action distance between target systems to be measured is taken as an H value to be substituted in the formula (3) and the formula (4), the value is taken as the H value to be substituted in the formula (4), and the equivalent reflected electromagnetic field strength H under the standard action distance is calculated₁Drive current I of analog coil with target signal₁(ii) a Then, the driving current I of the target signal simulation coil is adjusted by taking the calculated value as the reference₁To find the minimum value I of the driving current under the condition that the target system to be detected can reliably detect the target_1minAnd calculating according to the formula (4) to obtain a corresponding action distance h, wherein the action distance is the limit electromagnetic detection action distance of the target system to be detected and can be used as an action distance performance index of the target system to be detected.

In conclusion, the onshore test method for the underwater active electromagnetic detection action distance has the advantages that the test scheme is low in implementation difficulty, the steps are simple, the onshore test method is easy to implement, and the cost of manpower and material resources consumed in the test process is low; the difference between a seawater medium and an air medium is considered, attenuation parameter correction is added to the test model, and the test result is more accurate and credible; the test method provides a certain implementation scheme flexibility, can adapt to the actual test requirements of the target system to be tested in different places and different structure types, and the test model can better adapt to the scale characteristics of multiple types of targets to be tested, so that the test method can meet the requirement of the acting distance index test of underwater active electromagnetic detection systems with different functions or purposes, and has wide applicability.

Finally, the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, which should be covered by the claims of the present invention.