CN107247292B - A kind of measurement of precise measurement unexploded characteristic response and scaling method - Google Patents
A kind of measurement of precise measurement unexploded characteristic response and scaling method Download PDFInfo
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Abstract
A kind of measurement of precise measurement unexploded characteristic response of the invention and scaling method belong to object detection and recognition technical field, it is mainly used for measuring the characteristic response of various typical unexplodeds in laboratory, to establish unexploded characteristic response database, as the foundation identified during actual detection to objective body.Method of the invention is to measure the secondary field that unexploded is generated along the longitudinal axis and X direction respectively under the excitation in uniform pulse magnetic field；Measuring system is demarcated to obtain the calibration coefficient of characteristic response；Finally obtain objective body characteristic response lp(t)、lv(t).The present invention problem low for conventional method measurement accuracy, devise the device of measurement unexploded characteristic response, Bring out Background field is deducted, adjustment measures distance and scaling method to improve the measurement accuracy of characteristic response, provides a kind of effective means for the accurate acquisition of unexploded characteristic response.
Description
Technical field
The invention belongs to the technical fields of object detection and recognition, and in particular to using the device specially designed, test
Interior carries out the theory and method of precise measurement to the characteristic response of various unexplodeds, these characteristic responses can be used for establishing feature
Response database, as system in actual detection to the basis of characterization of various targets.
Background technique
Unexploded refers mainly to unexplosive land mine, shell, bomb for leaving after war or other military activities etc..These
Ammunition intersperses among earth's surface or the underground position Ji Qian, seriously threatens the life security of people, influences local society and economic development.Wink
Power transformation magnetic method is widely used in unexploded detection since detection efficient is high, strong to target identification ability.
As a kind of metal probing method, complete unexploded can cause transient electrical with the metal clips etc. being largely crushed
Magnetic system response abnormality.The type that detected object how is judged according to exception response is transient electromagnetic system detection unexploded
The key of medicine.Include various types unexploded characteristic response database by establishing one, identifies target when as actual detection
The foundation of body can effectively improve system to the recognition capability of detected object.Therefore it establishes one and includes various unexplodeds spies
The database for levying response is most important for target identification.The invention proposes one kind can accurately measure various unexploded features
The measurement of response and scaling method, the method can accurately measure unexploded characteristic response in the lab, with establish it is various not
The characteristic response database of quick-fried bullet.
By document, " Chen Shudong, Guo Shuxu, refreshing etc., several limited conductor transient electromagnetic characteristic responses of typical near-surface are ground
Study carefully [J] Chinese Journal of Geophysics, 2017,60 (1): 403-412. " has two it is found that most of unexploded is axially symmetric structure
Characteristic response: the longitudinal axis characteristic response along major axes orientation, the horizontal axis characteristic response perpendicular to major axes orientation.The prior art is measuring
This two characteristic responses when construction feature response database, do not consider objective body size, using transmitting coil directly excitation target
Body obtains the characteristic response of objective body by Inversion Calculation according to the secondary field received.This method has following deficiency: first
First, realistic objective body has certain volume, and the primary field that each position is subject to is not identical, this will lead to characteristic response measurement and misses
Difference；Secondly, the earth and other background responses are not deducted when measurement, therefore cause characteristic response bigger than normal；Finally, due to by
The influence of signal saturation and noise, measures objective body characteristic response Severe distortion, constructs number using the characteristic response of these distortion
According to library, the accuracy of target identification will be reduced.
Summary of the invention
The technical problem to be solved by the present invention is in view of the deficiencies of the prior art, propose a kind of precise measurement unexploded feature
The device of response, and the method that a set of pair of unexploded characteristic response measures is developed based on this device, it realizes not quick-fried
Play characteristic response precise measurement；Different measuring devices are designed from X direction characteristic response according to the unexploded longitudinal axis, utilize mark
Determine the accuracy that method improves measurement.
The present invention is to solve technical problems to be solved, provides following technical solution.1) building unexploded characteristic response is surveyed
The special device of amount；2) response of background deduction method measurement the unexploded longitudinal axis and horizontal axis is utilized；3) measurement unexploded is rung respectively
The early part answered and advanced stage part；4) data aggregate is demarcated and is carried out to objective body response, to improve characteristic response
Measurement accuracy.
The purpose of the present invention is what is realized by technical solution in detail below:
A kind of measurement of precise measurement unexploded characteristic response and scaling method, step include building unexploded characteristic response
Measuring device is responded using the y direction response and X direction of background deduction method measurement unexploded, and measurement unexploded is early
Phase response and later period response carry out calibration to unexploded response and obtain characteristic response, finally carry out early sign response and advanced stage
Characteristic response data aggregate；
The building unexploded characteristic response measuring device is using long straight solenoid, square coil group and to receive line
Circle constitutes measuring device, and long straight solenoid and square coil group motivate not from the longitudinal axis and X direction respectively as excitation coil
Quick-fried bullet；Receiving coil receives the secondary field of the longitudinal axis that unexploded generates and horizontal axis both direction；
Described is responded using background deduction method measurement unexploded y direction, is that unexploded is placed in long straight solenoid
In, measure its y direction overall response；Unexploded is taken out, y direction background response is measured again, by y direction overall response
It subtracts y direction background response and obtains the response of unexploded y direction；Described measures unexploded using background deduction method
X direction response, is to be placed in unexploded in square coil group, measures its X direction overall response；Unexploded is taken out, again
X direction background response is measured, X direction overall response is subtracted into X direction background response and obtains unexploded X direction sound
It answers；
The measurement unexploded early stage response and later period response are adjustment the distance between receiving coil and unexploded h,
When unexploded and receiving coil distance farther out when measurement unexploded response early part, be closer when measurement unexploded response
Advanced stage part.
Described demarcates unexploded response, is that receiving coil is individually positioned in long straight solenoid and square coil
In group, and lead to sinusoidal current into long straight solenoid and square coil group, while recording the induced voltage in receiving coil, according to
The calculation of lightning induced voltage in electric current and receiving coil in excitation coil obtains the calibration coefficient of characteristic response；It is obtained by calibration
Unexploded characteristic response；
The response of carry out early sign and iate feature response data joint, is by signal strength and h3It is inversely proportional
Relationship reduces the signal strength of later period response, responds the iate feature of y direction and completes suitable connection with early sign response
Docking is closed, the y direction characteristic response curve of complete unexploded is obtained, responds the iate feature of X direction and early stage
Characteristic response completes suitable joint docking, obtains complete X direction characteristic response curve.
More specific process is described below respectively.
The long straight solenoid, be it is close around solenoid, length is greater than 2 times of tested unexploded length, to guarantee to grow
The uniformity of exciting field in straight solenoid；The square coil group, it is in series by a pair of coaxial parallel square coil, in
The consistency of field amplitude is motivated to be higher than 95% in heart district domain.
The y direction overall response is at a distance from receiving coil is between unexploded for h1When, the long straight spiral shell of record
Emission current amplitude I in spoolpa1Actual measurement with receiving coil responds Vpa1, y direction overall response is Vpa1/Ipa1；Described
Y direction background response is long straight solenoid is vacant, emission current amplitude I in record long straight solenoidpb1And receiving coil
Actual measurement respond Vpb1, y direction background response is Vpb1/Ipb1, then y direction, which responds, isDescribed
X direction overall response is at a distance from receiving coil is between unexploded for h1When, record emission current in square coil group
Amplitude Iva1Actual measurement with receiving coil responds Vva1, X direction overall response is Vva1/Iva1；The X direction background is rung
It answers, is square coil group is vacant, emission current amplitude I in record square coil groupvb1Actual measurement with receiving coil responds Vvb1,
X direction background response is Vvb1/Ivb1；Then X direction, which responds, is
The measurement early sign response is at a distance from receiving coil is between unexploded for h1When respectively measure
Y direction responds Lp1L is responded with X directionv1；The described measurement iate feature response, be by receiving coil and unexploded it
Between distance be h2, and h2Less than h1(usually take h130%~50%), repeat the distance between receiving coil and unexploded be
h1When measurement process, obtain y direction responseIt is responded with X direction
Described demarcates unexploded response, is that receiving coil is respectively placed in long straight solenoid and square coil
In group, passed in long straight solenoid, square coil group respectively frequency be f, amplitude ICSinusoidal current, record receiving coil
Middle signal Vc, according to formulaRespectively obtain the calibration coefficient k of y direction1With the calibration coefficient k of X direction2；
Unexploded early sign response l is obtained by following equation againP1, lV1L is responded with iate featureP2, lV2:With
The early stage response carries out data aggregate with later period response, and the early stage response carries out data with later period response
Joint is that early sign is made to respond lP1L is responded with iate featureP2Joint docking is completed, the longitudinal axis side of complete unexploded is obtained
To characteristic response curve；It is that early sign is made to respond lV1L is responded with iate featureV2Joint docking is completed, complete horizontal axis is obtained
Direction character response curve.The specific can be that: from lP2First not distortion data start and (be assumed to be n-th data), one
The last one data is directly got, as lPLater period response；From lP1First data start, continuously take N-1 data, as
lPEarly stage response, obtain complete y direction characteristic response lP；From lV2First not distortion data start (to be assumed to be
N number of data), the last one data is got always, as lVLater period response；From lV1First data start, continuously take N-
1 data, as lVEarly stage response, obtain the X direction characteristic response curve l of complete unexplodedV。
It measures to obtain a pair of of y direction characteristic response curve and X direction by the unexploded to various models
Characteristic response curve, so that it may constitute the database of unexploded characteristic response.The buried target body that sensor is detected is (i.e. not
Quick-fried bullet) database of signal and characteristic response compares, so that it may definitely descend the more detailed information of objective body.
The present invention is to carry out the theory and method of precise measurement to the characteristic response of various unexplodeds in laboratory, these
Characteristic response can be used for establishing characteristic response database, as system in actual detection to the basis of characterization of various targets.This
Invention compared with the prior art, realizes the precise measurement to unexploded characteristic response, improves the accuracy to target identification.
Detailed description of the invention
Fig. 1 is that the three-dimensional sense of unexploded answers dipole model.
Fig. 2 is characteristic response measurement timing diagram.
Fig. 3 is the measuring device schematic diagram of characteristic response.
Fig. 4 is longitudinal axis characteristic response instrumentation plan.
Fig. 5 is horizontal axis characteristic response instrumentation plan.
Fig. 6 is characteristic response instrumentation plan under different distance.
Fig. 7 is characteristic response calibration schematic diagram.
Fig. 8 is that embodiment 2 surveys obtained characteristic response lP(t)、lV(t) figure.
Specific embodiment
Embodiment 1: the further analysis of measurement method of the present invention (objective body hereinafter is exactly unexploded).
1, the definition of unexploded characteristic response
As shown in Figure 1, unexploded is in pulsed magnetic field HPVortex current is induced under the excitation of (primary field), is vortexed in space
The magnetic field (secondary field) of middle generation can be equivalent to the dipole m=(m that one group of center is overlapped, direction is orthogonalx, my, mz) in sky
Between middle generation magnetic field, secondary field H can be calculated at P point in space are as follows:
(1) in formula, r is the position vector of P point, and r is the modulus value of r, erFor the unit vector for being parallel to r.
When unexploded main shaft is parallel to z-axis, dipole m is calculated are as follows:
The β of axial symmetry objective bodyxx=βyy, it is referred to as magnetic polarization intensity of the objective body along X direction, βzzFor objective body edge
The magnetic polarization intensity of y direction, HPX、HPY、HPZFor three components of primary field.By magnetic polarization intensity to the opposite of time-derivative
Number is defined as the characteristic response of objective body:
According to (3,4) formula, by lP(t) it is known as the longitudinal axis characteristic response of objective body, lV(t) it is known as the horizontal axis feature of objective body
Response.
2, the basic principle of transient electromagnetic detecting unexploded characteristic response
When being carried out using transient electromagnetic systematic survey unexploded characteristic response, transmitter passes through long straight solenoid and rectangular lines
Circle group generates uniform pulse magnetic field excitation unexploded respectively, and receiving coil is during pulsed magnetic field disappears, measurement unexploded response,
It is as shown in Figure 2 to measure timing.
In Fig. 2, in 0-t0In period, transmitter generates pulsed magnetic field, incentives target body by excitation coil.In t0When
The shutdown of magnetic field moment is carved, vortex current will be induced in objective body, is vortexed the secondary field of generation from t0Moment starts when longer
Interior slow-decay is simultaneously received coil record, including the longitudinal axis and horizontal axis characteristic response.
According to from shutdown moment t0Distance, the response of objective body can be divided into early stage response and later period response, early stage ring
It should distance t0Closely, response amplitude is easily saturated greatly；Later period response distance t0Far, response amplitude low signal-to-noise ratio is low.It is proposed by the present invention
The longitudinal axis of objective body, the apparatus and method of horizontal axis characteristic response are accurately measured, by adjusting between receiving coil and objective body
Distance, set h for distance between receiving coil and objective body first1, so that received signal be in it is undistorted most
Big state measures the early stage response of unexploded；Adjusting receiving coil and transmitting coil distance is h2, h2Less than h1, measure unexploded
Later period response；Signal strength and h are pressed again3The relationship being inversely proportional by signal strength adjust the distance h carry out normalizing, make later period response
Signal is completed suitably to combine docking with the signal of early stage response, improves the accuracy of unexploded characteristic response measurement.
3, the measuring device of unexploded characteristic response
Unexploded characteristic response needs to obtain under the excitation of the uniform magnetic field of main shaft or vertical major, general transmitting coil
It can not be set respectively for the axial symmetry objective body longitudinal axis with horizontal axis characteristic response in a wide range of interior uniform primary field of generation, the present invention
Long straight solenoid coil and square coil group are counted, to generate uniform primary field, as shown in Fig. 3.
In Fig. 3 (a), length l, diameter is the n of D0Circle long straight solenoid is generated along axial equally distributed pulsed magnetic field,
For incentives target body along the characteristic response of major axes orientation, guarantee objective body various pieces are by an identical field excitation, greatly
The big precision for improving the measurement of objective body longitudinal axis characteristic response.In Fig. 3 (b), using the concatenated mode of a pair of of square coil, at two
The centre of square coil generates the uniform magnetic field along Z-direction, and the uniformity coefficient of pulsed magnetic field can achieve 95% or more, with this
Magnetic field excitation simultaneously measures objective body horizontal axis characteristic response, guarantees the accuracy of measurement.
4, the measurement method of the characteristic response based on background deduction
When measuring objective body characteristic response, not only comprising the response of objective body in response, also responded comprising ambient enviroment,
Therefore the method that the present invention uses background deduction eliminates the influence that environmental response measures objective body characteristic response, measurement signal
Scheme as follows:
(1) background response of longitudinal axis characteristic response
It is first that long straight solenoid is vacant, it is not put into objective body, receiving coil is placed in h immediately below long straight solenoid1
Place, receiving coil is axially parallel to long straight solenoid axial direction, as shown in Fig. 4 (a).Record emission current amplitude Ipb1, record is in fact
Survey response Vpb1。
(2) overall response of longitudinal axis characteristic response
Objective body is put into long straight solenoid center, is oriented parallel to long straight solenoid, receiving coil is still located at long straight spiral shell
H immediately below spool1Place is oriented parallel to long straight solenoid axial direction, as shown in Fig. 4 (b).Record emission current amplitude Ipa1, record
Actual measurement response Vpa1。
Its emission current is normalized in above-mentioned two groups of actual measurements response, obtains in unity emitter current excitation
Under, objective body responds L along y directionp1:
(3) background response of horizontal axis characteristic response
It is first that square coil group is vacant, it is not put into objective body, receiving coil is placed in h immediately below square coil group1
Place is oriented parallel to square coil axial direction, as shown in Fig. 5 (a).Record emission current amplitude Ivb1, record reception voltage Vvb1。
(4) overall response of horizontal axis characteristic response
Objective body is put at square coil center, objective body is made to be axially parallel to square coil longitudinal direction, will be received
Coil is placed in h immediately below coil1Place is oriented parallel to square coil axial direction, as shown in Fig. 5 (b).Record emission current amplitude
Iva1, record reception voltage Vva1。
Above-mentioned four groups of data are handled, are obtained under unity emitter current excitation, objective body is responded along X direction
Lv1:
5, the measurement method that y direction response, X direction respond under different distance
To improve measurement accuracy, when measuring the longitudinal axis, horizontal axis characteristic response, by adjusting between receiving coil and objective body
Distance, make in receiving coil signal amplitude maximum and do not distort, distance is denoted as h1, measure the early stage response of objective body；Again will
Receiving coil and objective body distance are reduced to h2(usually take h130%~50%), measure objective body later period response.It finally will be remote
The early stage response that range measurement obtains is combined with the later period response that close-in measurement obtains, and obtains the complete feature of objective body
Response.According to the method, receiving coil and objective body distance are reduced to h2, as shown in Figure 6.
Duplicate measurements according to the method described above obtains 8 groups of data V againpa2, Vpb2, Ipa2, Ipb2, Vva2, Vvb2, Iva2, Ivb2。
It calculates separately to obtain L according to this 8 groups of datap2, Lv2。
6, measurement result is demarcated
Upper planar survey (5-8) formula obtained only includes the dampening information of unexploded characteristic response at any time, and is not included
The amplitude information of characteristic response, the present invention propose the amplitude information that characteristic response is accurately obtained using scaling method, specific method
It is as follows:
Receiving coil is put in target location, as shown in Figure 7.It is f, amplitude I that frequency is passed in transmitting coilC's
Sinusoidal current measures signal V in receiving coilc, then have:
VC=-2 π fSBC=-2 π fICB0S (9)
(9) in formula, BCFor the magnetic field at receiving coil, B0For the magnetic field that unitary current in coil generates, S is receiving coil
Equivalent area.It is obtained by (9):
K is transmitting, the calibration coefficient for receiving system in above formula.For the calibration coefficient of long straight solenoid and square coil group
Respectively k1, k2.Since k is calibration result, the amplitude of unexploded characteristic response is calculated using k, precision is significantly larger than direct
The result of calculating.According to calibration coefficient k1, k2And distance h1, h2By Lp1, Lv1, Lp2, Lv2This four groups of data are demarcated, and are obtained
To unexploded characteristic response lP1, lV1, lP2, lV2:
7, data aggregate is carried out to characteristic response
To lP1With lP2Carry out data aggregate, the method is as follows: from lP2First not distortion data start (to be assumed to be n-th
Data), the last one data is got always, as lPLater period response, from lP1First data start, continuously take N-1
Data, as lPEarly stage response, obtain complete unexploded y direction characteristic response curve lP.From lV2First it is not abnormal
Parameter gets always the last one data, as l according to beginning (being assumed to be n-th data)VLater period response；From lV1First
A data start, and N-1 data are continuously taken, as lVEarly stage response, obtain complete unexploded X direction characteristic response
Curve lV。
It is 27cm that embodiment 2, which measures length, and diameter is the characteristic response of 82mm mortar projectile
1, the measuring device of unexploded characteristic response is established.
Establish a pair of of characteristic response measuring device as shown in Figure 3: long straight solenoid length is 120cm, diameter 22cm,
Totally 30 circle is uniformly distributed, the measuring device as longitudinal axis characteristic response.Square coil group by two series aiding connections square coil
It constitutes, each long 100cm of square coil, wide 60cm, the number of turns 12, the coaxial placement in parallel of two square coils, distance 36cm, structure
At horizontal axis characteristic response measuring device.
2, unexploded longitudinal axis characteristic response measures.
As shown in figure 4, receiving coil is placed in h immediately below long straight solenoid1At=100cm, make the normal direction of receiving coil
It is parallel to long straight solenoid axis direction, generates secondary field for receiving objective body.
(1) response measurement process
A, ambient field response measurement: it is first that long straight solenoid is vacant, it is not put into objective body, as shown in Fig. 4 (a).Emitting
The emission current I that peak value is 9A is passed in coilpb1.The ambient field response incuded in acquisition receiving coil, measurement result is named
For Lpb1It is saved.
B, total field measurement: being placed in long straight solenoid center for 82mm mortar projectile, makes its major axes orientation and long straight spiral shell
Spool direction is consistent, as shown in Fig. 4 (b).The emission current I that peak value is 9A is passed in transmitting coilpa1.Acquire receiving coil
The resultant field of middle induction responds, and measurement result is named as Lpa1It is saved.
(2) adjustment measurement distance
Adjusting receiving coil and objective body distance is h2=40cm, as shown in Fig. 6 (a).According to the method weight of above-mentioned (1)
Repetition measurement amount, record obtain emission current amplitude Ipb2For 9A, Ipa2For 9A, ambient field responds Vpb2And resultant field responds Vpa2。
(3) characteristic response is demarcated
In order to improve the accuracy of measurement, measured data is demarcated, specific as follows:
A, receiving coil is put in long straight solenoid center, as shown in Fig. 7 (a).
B, it is 2kHz that frequency is passed in long straight solenoid, and amplitude is the sinusoidal current of 0.6557mA, measures receiving coil
The calibration coefficient k of longitudinal axis characteristic response is calculated according to formula (10) in middle signal amplitude 0.9V1=0.1092.
Objective body longitudinal axis characteristic response l is calculated according to (5), (7), (11), (13)P1(t)、lP2(t), and according to step
Rapid 7 by lP1(t)、lP2(t) combined, obtain unexploded longitudinal axis characteristic response lP(t), as shown in Figure 8.
3, unexploded horizontal axis characteristic response measures
Receiving coil is placed in h immediately below square coil group1At=100cm, it is parallel to the normal orientation of receiving coil
The axial direction of square coil group generates secondary field for receiving objective body.
(1) response measurement process
A, ambient field response measurement: it is first that square coil group is vacant, it is not put into objective body, as shown in Fig. 5 (a).Emitting
The emission current I that peak value is 7A is passed in coilvb1.The ambient field response incuded in acquisition receiving coil, measurement result is named
For Vvb1It is saved.
B, total field measurement: 82mm mortar projectile is placed in square coil group center, makes its major axes orientation and rectangular lines
Circle group longitudinal direction is consistent, as shown in Fig. 5 (b).The emission current I that peak value is 7A is passed in square coil groupva1.Acquisition connects
The ambient field response incuded in take-up circle, is named as V for measurement resultva1It is saved.
(2) adjustment measurement distance
Adjusting receiving coil and objective body distance is h2=40cm, as shown in Fig. 6 (b).According to above-mentioned (1), the side of (2)
Method duplicate measurements, record obtain emission current amplitude Ivb2For 7A, Iva2For 7A, ambient field responds Vvb2And resultant field responds Vva2。
(3) characteristic response is demarcated
In order to improve the accuracy of measurement, measured data is demarcated, specific as follows:
A, receiving coil is put in target location, as shown in Fig. 7 (b).
B, using signal source, it is 8kHZ that frequency is passed in transmitting coil, and amplitude is the sinusoidal current of 1.3115mA, is measured
The calibration coefficient k of longitudinal axis characteristic response is calculated according to formula (7) in signal amplitude 0.9V in receiving coil1=0.0137.
Objective body horizontal axis characteristic response l is calculated according to (6), (8), (12), (14)V1(t)、lV2(t), and by lV1
(t)、lV2(t) combined, obtain unexploded horizontal axis characteristic response lV(t), as shown in Figure 8.
Pass through one group of characteristic response l for measuring with demarcating 82mm mortar projectile obtainedP(t)、lV(t) as shown in Fig. 8.
Claims (5)
1. measurement and the scaling method of a kind of precise measurement unexploded characteristic response, step includes that building unexploded characteristic response is surveyed
Device is measured, is responded using the y direction response and X direction of background deduction method measurement unexploded, measurement unexploded early stage
Response and later period response, carry out calibration to unexploded response and obtain characteristic response, finally carry out early sign response and advanced stage is special
Levy response data joint；
The building unexploded characteristic response measuring device is to utilize long straight solenoid, square coil group and receiving coil structure
At measuring device, long straight solenoid and square coil group motivate unexploded from the longitudinal axis and X direction respectively as excitation coil；
Receiving coil receives the secondary field of the longitudinal axis that unexploded generates and horizontal axis both direction；
Described is responded using background deduction method measurement unexploded y direction, is that unexploded is placed in long straight solenoid,
Measure its y direction overall response；Unexploded is taken out, y direction background response is measured again, y direction overall response is subtracted
Y direction background response obtains the response of unexploded y direction；The horizontal axis using background deduction method measurement unexploded
Directional response is placed in unexploded in square coil group, its X direction overall response is measured；Unexploded is taken out, is measured again
X direction overall response is subtracted X direction background response and obtains the response of unexploded X direction by X direction background response；
The measurement unexploded early stage response and later period response, are adjustment the distance between receiving coil and unexploded h, when not
Quick-fried bullet and receiving coil distance farther out when measurement unexploded response early part, when being closer the response of measurement unexploded evening
Phase part；
Described demarcates unexploded response, is that receiving coil is individually positioned in long straight solenoid and square coil group
In, and lead to sinusoidal current into long straight solenoid and square coil group, while recording the induced voltage in receiving coil, according to sharp
It encourages the calculation of lightning induced voltage in electric current and receiving coil in coil and obtains the calibration coefficient of characteristic response；It is obtained not by calibration
Quick-fried bullet characteristic response；
The response of carry out early sign and iate feature response data joint, is by signal strength and h3The relationship being inversely proportional
The signal strength for reducing later period response responds the iate feature of y direction and completes suitable combine pair with early sign response
It connects, obtains the y direction characteristic response curve of complete unexploded, make iate feature response and the early sign of X direction
Suitable joint docking is completed in response, obtains complete X direction characteristic response curve.
2. measurement and the scaling method of precise measurement unexploded characteristic response according to claim 1, characterized in that described
Long straight solenoid, be it is close around solenoid, length is greater than 2 times of tested unexploded length；The square coil group, by one
In series to coaxial parallel square coil, central area motivates the consistency of field amplitude to be higher than 95%.
3. measurement and the scaling method of precise measurement unexploded characteristic response according to claim 1, characterized in that described
Y direction overall response, be at a distance from receiving coil is between unexploded for h1When, it records and emits electricity in long straight solenoid
Stream amplitude Ipa1Actual measurement with receiving coil responds Vpa1, y direction overall response is Vpa1/Ipa1；The y direction background is rung
It answers, is long straight solenoid is vacant, emission current amplitude I in record long straight solenoidpb1Actual measurement with receiving coil responds Vpb1,
Y direction background response is Vpb1/Ipb1, then y direction, which responds, isThe X direction overall response,
It is at a distance from receiving coil is between unexploded for h1When, record emission current amplitude I in square coil groupva1With reception line
The actual measurement of circle responds Vva1, X direction overall response is Vva1/Iva1；The X direction background response is by square coil group
It is vacant, record emission current amplitude I in square coil groupvb1Actual measurement with receiving coil responds Vvb1, X direction background response
For Vvb1/Ivb1；Then X direction, which responds, is
4. measurement and the scaling method of precise measurement unexploded characteristic response according to claim 1,2 or 3, feature
It is that it is at a distance from receiving coil is between unexploded for h that the measurement unexploded early stage, which responds,1When measure respectively it is vertical
Axis direction responds Lp1L is responded with X directionv1；The measurement unexploded later period response, be by receiving coil and unexploded it
Between distance be reduced to h2, h2Take h130%~50%, repeat the distance between receiving coil and unexploded be h1When measurement
Process obtains y direction responseIt is responded with X directionWherein, Vpa2、Ipa2Point
Be not the distance between receiving coil and unexploded be h2When receiving coil actual measurement response and long straight solenoid in emission current
Amplitude, Vpa2/Ipa2It is h for the distance between receiving coil and unexploded2When y direction overall response；Vpb2、Ipb2It is long respectively
Emission current amplitude, V in the actual measurement response of receiving coil and long straight solenoid when straight solenoid is vacantpb2/Ipb2For y direction
Background response；Vva2、Iva2It is at a distance from receiving coil is between unexploded respectively for h2When receiving coil actual measurement response and
Emission current amplitude, V in square coil groupva2/Iva2It is h for the distance between receiving coil and unexploded2When X direction it is total
Response；Vvb2、Ivb2It is emission current width in the actual measurement response and square coil group of receiving coil when square coil group is vacant respectively
Degree, Vvb2/Ivb2For X direction background response.
5. measurement and the scaling method of precise measurement unexploded characteristic response according to claim 1, characterized in that described
Unexploded response is demarcated, be to be respectively placed in receiving coil in long straight solenoid and square coil group, exist respectively
Passed in long straight solenoid, square coil group frequency be f, amplitude ICSinusoidal current, record receiving coil in signal Vc, root
According to formulaRespectively obtain the calibration coefficient k of y direction1With the calibration coefficient k of X direction2；Following equation is pressed again
Obtain unexploded early sign response lP1, lV1L is responded with iate featureP2, lV2:WithWherein, Lp1It is defined as receiving
The distance between coil and unexploded are h1When y direction respond, for y direction overall response subtract y direction background ring
It answers, Lv1Being defined as the distance between receiving coil and unexploded is h1X direction response subtracts cross for X direction overall response
The background response of axis direction；Lp2Being defined as receiving coil and unexploded distance is h2When y direction respond, be y direction it is total
Response subtracts the background response of y direction, Lv2Being defined as receiving coil and unexploded distance is h2When X direction respond, be
X direction overall response subtracts the background response of X direction.
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