CN102955000A - Adaptive eddy displacement detecting method - Google Patents
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- CN102955000A CN102955000A CN2012103037776A CN201210303777A CN102955000A CN 102955000 A CN102955000 A CN 102955000A CN 2012103037776 A CN2012103037776 A CN 2012103037776A CN 201210303777 A CN201210303777 A CN 201210303777A CN 102955000 A CN102955000 A CN 102955000A
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Abstract
The invention relates to an adaptive eddy displacement detecting method, which comprises the following steps of: 1, producing a sinusoidal signal with a fixed frequency; 2, amplifying the sinusoidal signal; 3, exciting a probe coil; 4, acquiring a response signal; 5, carrying out logarithmic transformation on the response signal; 6, carrying out analog-to-digital conversion; 8, carrying out adaptive interrupt request judgment; when a detected material is replaced or the electromagnetic properties of the detected material are unknown, turning to a step 9 to carry out recalibration; and when the detected material is not changed, skipping to a step 10 to calculate a displacement value without carrying out recalibration; and 9, carrying out calibration on an eddy displacement detection device. The method disclosed by the invention has the advantages and beneficial effects that according to the method disclosed by the invention, the electromagnetic properties and categories of materials can be automatically identified, and the detection device can be automatically calibrated, thereby eliminating the influence on detection results caused by the electromagnetic properties of materials, and improving the detection accuracy of the eddy displacement detection device.
Description
Technical field
The invention belongs to technical field of nondestructive testing, be specifically related to the harmless displacement detecting technology of eddy current.
Background technology
Eddy detection technology is fast Dynamic Non-Destruction Measurement of development in recent years, and it utilizes the electromagnetic induction principle realization to monitoring, measurement and the assessment of metal material or workpiece.Alternating current will be passed in the probe coil, at this moment near in the coil and the magnetic field that will produce alternation, near metal material will the eddy generation effect, at material surface and the inner eddy current that produces, eddy current can produce secondary magnetic field and react on probe coil, thereby changes the parameters such as the distribution in original magnetic field and probe coil equiva lent impedance.
The size of eddy current and distribute, outside the Pass having with coil shape and size, size of current and frequency etc., also depend on measured material shape, inherent vice, with the factors such as the conductivity of the distance of coil and material, magnetic permeability.So in the situation that it is constant to fix other conditions, the eddy current displacement pick-up unit just can be used for detecting the distance of metal works and probe coil, thereby reaches the purpose of measuring workpieces mechanical shift.The eddy current displacement pick-up unit is because having impact, the advantages of simple structure and simple that reliable long-term working is good, measurement range is wide, highly sensitive, resolution is high, response is fast, interference resistance by force, is not subjected to the media such as greasy dirt, is used widely in the detection of the key components and partss such as Aero-Space, track traffic, large rotating machinery and assessment.
Although the eddy current displacement detection technique just is used widely at different engineering fields from being born, it is very large that EDDY CURRENT mechanism has determined that eddy current displacement pick-up unit probe coil equiva lent impedance is affected by the electromagnetic property of measurand.The workpiece that the identical different metal material of geometric configuration and working environment is made, because the electromagnetic property difference of himself, the result difference that general method of testing obtains is very large.In engineering test is demarcated, the corresponding calibration process of a kind of measurand, when different materials was detected, the eddy current displacement pick-up unit must be demarcated again like this, and workload is very large and not easy to operate; Or when material behavior was unknown, pick-up unit can not carry out quantitative measurment.These phenomenons have seriously reduced the interchangeability of eddy current displacement pick-up unit, define its usable range.
At present, the testing circuit of eddy current displacement pick-up unit adopts the inductance type transducer principle design to form more, mostly adopts the signal modulation systems such as fixed frequently amplitude modulation, frequency conversion amplitude modulation and frequency modulation.In the design of eddy current displacement pick-up unit, distance between coil and the measurand can be converted to quality factor q, equiva lent impedance Z and the equivalent inductance L of coil, and the task of metering circuit is exactly the variation that the variation of these parameters is transformed to voltage, electric current or frequency.Realize conversion between physical quantity and the electric weight but these methods all are the independent relation of utilizing displacement and voltage, electric current or frequency, be difficult to effective way and solve the impact that the material electromagnetic property produces measurement result.
Because engineering is used upper elimination material electromagnetic property is affected widely demand is arranged, people have also invented some feasible methods and have realized this function at present, and typical scheme has following two kinds.
First method, based on the measuring method of probe impedance VECTOR SCIAGRAPHY (patent of invention, Du Pingan, Yu Yating, Yang Tuo. a kind of Eddy current displacement detection method. application number 201010264717.9).This invention is by the real part R to the eddy current probe coil impedance
bWith imaginary part X
bCarry out the vector projection eliminate the eddy current displacement pick-up unit measure in the measurand electromagnetic property on the impact of Output rusults.The method is by extracting difference in magnitude and the phase signal real part and the imaginary part that obtain eddy current displacement pick-up unit probe coil impedance of probe coil under the pumping signal effect, adopt again the vector projection to carry out the equiva lent impedance conversion, utilize at last the funtcional relationship of equiva lent impedance and detection distance to come the output detections result, reach the purpose of displacement detecting.
Second method, the measuring method that detects based on magnetic field intensity (patent of invention: Yu Yating, Du Pingan, Yang Tuo. a kind of shimmy Eddy current displacement detection method of electronics and device thereof eliminated. application number 201010268977.3, publication number CN101975543A).The measurand that this invention will have different conductivity is magnetized fully, then detects the magnetic field intensity at eddy current displacement pick-up unit probe place by the metering circuit of design, magnetic field intensity is decomposed again, and obtains real part and the imaginary part vector of magnetic field intensity.Under same displacement, the complex vector located real part of magnetic induction density signal and imaginary part are positioned on the same elliptic curve in the Magnetic Sensor; Elliptic curve cocooning tool under the different displacements has identical steering angle and is tangential on the characteristics of a bit, determines the displacement of measurand by calculating oval major semi-axis.
The first adopts the analog/digital hybrid circuit design based on the measuring method of probe impedance vector projection, mainly has following 2 problems:
(1) real part resistance value and the imaginary part inductance value of the method in order to extract the probe coil impedance needs the complicated hardware circuit of design, and this has just increased difficulty and the cost of circuit design.
(2) the method is carried out projection to the vector form of impedance in plane coordinate system, needs a large amount of calculation procedures.In computation process, also can introduce the complicated functions such as trigonometric function, inverse trigonometric function, the method adopts single-chip microcomputer to finish these complex calculation need to take the inner a large amount of storage resources of single-chip microcomputer, complicated program has also expended a large amount of time simultaneously, and this just must reduce the real-time of eddy current displacement pick-up unit test.Moreover, be subjected to single-chip microcomputer to calculate the restriction of figure place, the precision of test result is not high.The critical defect of first method in a word: computation process is complicated, and real-time is poor, low precision.
Although the method that the second detects based on magnetic field intensity breaks through the limitation of classic method, does not recycle the physical quantitys such as coil quality factor, impedance, inductance and measures.But the introducing Magnetic Sensor by the magnetization measurand, detects the magnetic field intensity row vector of going forward side by side and decomposes, and finally reaches and eliminates the material electromagnetic property to the impact of testing result.But the introducing of Magnetic Sensor, technical difficulty and the financial cost of pick-up unit have greatly been increased, simultaneously required model of ellipse more complicated, if divorced from computer is designed to independently or portable pick-up unit, for microprocessor, need to seek the algorithm that effectively calculates oval major semi-axis, and need the strong high-performance microprocessor of data-handling capacity.The critical defect of second method is that technical difficulty is large in a word, and cost of development is high.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of existing eddy current detection method detection computations process complexity, a kind of self-adaptation Eddy current displacement detection method has been proposed, adopt the Eddy current displacement detection method of the method can make the calibrating parameters in the eddy current displacement testing process mate better the electromagnetic property that is detected material, the precision that detects to improve the eddy current displacement pick-up unit.
Technical scheme of the present invention: a kind of self-adaptation Eddy current displacement detection method comprises the steps: at least
Step 3. incentive probe coil;
Step 4. is obtained response signal;
Step 5. pair response signal is carried out log-transformation;
Step 6. analog to digital conversion;
Step 8. self-adaptation interrupt request is judged; When changing measured material or when the measured material electromagnetic property is unknown, is then entering step 9 and again demarcate; When measured material is constant, then need not again to demarcate, redirect enters step 10 displacement calculating value;
Step 9. pair eddy current displacement pick-up unit is demarcated;
The value of step 10. displacement calculating; Amplitude signal V
mWith phase signal V
pBe the electric signal that characterizes detected displacement d, the size of their values has reflected the size of displacement d.With amplitude signal V
mWith phase signal V
pMake ratio, and in coordinate system, carry out the value that projection calculates displacement d with displacement d.
The specific implementation process of above-mentioned steps 5 is: to response signal U
rWhen carrying out the logarithm variation, select pumping signal U
1As the reference signal, as shown in Equation 5, with response signal U
rAmplitude and pumping signal U
1Amplitude do than and take the logarithm, then multiply by variation factor, and add a side-play amount, obtain amplitude signal V
mIn like manner, with response signal U
rPhase place and pumping signal U
1Phase place do poor and take the logarithm, then multiply by variation factor, and add a side-play amount, obtain phase signal V
p, V
mAnd V
pIt all is d. c. voltage signal.
V
p=-0.6log(|φ
r-φ
1|-90°)+0.9
The specific implementation process of above-mentioned steps 9 is: begin in calibration process, system can require the user to select three different positions in range ability, waiting system gathers related data, then carry out linear fit according to the data least square method of these three differences, calculate the slope k of fitting a straight line, then judge the electromagnetic property classification of material according to slope k.
Advantage of the present invention and beneficial effect: method of the present invention can be identified material electromagnetic property classification and automatic Calibration pick-up unit automatically.The method can be identified automatically by (the abbreviation system) of designed eddy current displacement pick-up unit the electromagnetic property classification of detected material, then by calibrating procedure the eddy current displacement pick-up unit is carried out again automatic Calibration, make so the relevant calibrating parameters of eddy current displacement pick-up unit can mate better the electromagnetic property that is detected material, thereby eliminate the material electromagnetic property to the impact of testing result, improve the precision that the eddy current displacement pick-up unit detects.
Description of drawings
Fig. 1 is overview flow chart of the present invention.
Fig. 2 is amplitude signal V in the step 5 of the present invention
mWith phase signal V
pPerspective view.
Fig. 3 is automatic Calibration process flow diagram flow chart in the step 9 of the present invention.
Fig. 4 is that three diverse locations are determined material electromagnetic property classification schematic diagram in the step 9 of the present invention.
Fig. 5 is displacement d and V in the step 9 of the present invention
m/ V
pMatched curve figure.
Embodiment
The present invention is described further below in conjunction with the drawings and specific embodiments:
As shown in Figure 1, a kind of self-adaptation Eddy current displacement detection method comprises the steps:
U
0=A
0Cos (ω t+ φ
0) formula (1)
In the formula (1), U
0It is sinusoidal signal; A
0It is the amplitude of sinusoidal signal; ω is angular frequency; T is time variable; φ
0It is the initial phase of sinusoidal signal.Wherein be the ω known quantity, A
0And φ
0But be measured quantity.
Produce sinusoidal signal U among the present invention
0Method be: at first produce the PWM ripple by single-chip microcomputer, regulate the dutycycle of PWM ripple, make that fundamental component reaches maximum in the spectrum component of PWM ripple, adopt again the radio-frequency component of integrated filter filtering the inside, obtain needed sinusoidal signal U
0
U
1=A
1Cos (ω t+ φ
1) formula (2)
In the formula (2), U
1It is the pumping signal through obtaining after amplifying; A
1It is the amplitude of pumping signal; ω is angular frequency, with U
0In ω identical, do not change; T is time variable, φ
1It is the phase place of pumping signal.Wherein be the ω known quantity, A
1And φ
1But be measured quantity.
Step 3. incentive probe coil.In range ability, to produce eddy effect in order making between eddy current displacement pick-up unit probe coil and the tested metal material, must to have the electric current of sufficient intensity to flow through probe coil, so the effect of this step is exactly the pumping signal U that will obtain previously
1Carry out voltage-current transformation, to ensure sufficient intensity and stable current signal I
1The incentive probe coil.The feedback constant current design proposal that the present invention adopts double operational to form is finished the conversion of voltage-to-current, transformation result as shown in Equation (3),
In the formula (3), I
1Pumping signal U
1Carry out the current signal that obtains behind the Voltage-current conversion through constant-current source circuit; R
sBe regulating resistance, be used for setting current signal I
1Size, value presets; Other parameter and U
1In implication identical, do not change.
Step 4. is obtained response signal.When eddy current displacement pick-up unit probe coil and measured material eddy generation effect, the secondary magnetic fields that produces around the measured material is in probe coil, so that the equiva lent impedance of probe coil changes.At current signal I
1Excitation under, the two ends of probe coil will produce along with displacement changes and the voltage responsive signal U that changes
r, U
rCan be expressed as shown in the formula (4),
U
r=I
1Z
e=I
1(R
e+ j ω L
e)=A
rCos (ω t+ φ
r) formula (4)
In the formula (4), U
rIt is the voltage responsive signal at probe coil two ends; Z
eThe AC impedance of probe coil under the current signal effect; R
eZ
eReal part, L
eZ
eImaginary part; A
rVoltage responsive signal U
rAmplitude, φ
rVoltage responsive signal U
rPhase place.
The present invention adopts the anti-phase follower that is made of integrated transporting discharging to obtain response signal U
r, can simplify circuit design like this, also can improve the Anti-jamming of signal ability simultaneously.
Step 5. pair response signal is carried out log-transformation.Response signal U through step 4 acquisition
rRelevant with the measured material electromagnetic property with displacement to be detected, by analyzing U
rAmplitude and phase place, just can obtain shift value to be measured.The present invention carries out log-transformation with amplitude, phase signal first, and then transformation results is carried out plane projection, carries out at last data fitting, to eliminate the material electromagnetic property to the impact of testing result.
To response signal U
rWhen carrying out the logarithm variation, select pumping signal U
1As the reference signal, as shown in Equation (5), with response signal U
rAmplitude and pumping signal U
1Amplitude do than and take the logarithm, then multiply by variation factor, and add a side-play amount, obtain amplitude signal V
mIn like manner, with response signal U
rPhase place and pumping signal U
1Phase place do poor and take the logarithm, then multiply by variation factor, and add a side-play amount, obtain phase signal V
p, V
mAnd V
pIt all is d. c. voltage signal.
V
p=-0.6log(|φ
r-φ
1|-90°)+0.9
With amplitude signal V
mWith phase signal V
pCarry out projection in coordinate plane, projection result has following two characteristics:
The first, the amplitude signal V of commaterial when difference detects displacement
mWith phase signal V
pLinear between the two, represent the V that metallic aluminium records such as eight little pentagram among Fig. 2 when detecting displacement for eight
mAnd V
pValue can find out that these points are linear distribution at straight line L
1Near, straight line L
1The expression metallic aluminium is amplitude signal V when eight different detection displacements
mWith phase signal V
pFitting a straight line; 6 straight lines among Fig. 2 have represented respectively the amplitude signal V of 6 kinds of detected materials
mWith phase signal V
pThe regularity of distribution.
The second, its amplitude signal of the material V with similar electromagnetic property
mWith phase signal V
pThe distribution straight line parallel to each other, the distribution straight slope of different kinds material differs greatly; Such as L among Fig. 2
1And L
2Represent respectively the amplitude signal V of metallic aluminium and metallic copper
mWith phase signal V
pFitting a straight line, two straight lines are parallel to each other, and illustrate that both have similar electromagnetic property, and straight line L
1With straight line L
5Not parallel, slope differs greatly, and illustrates that both electromagnetic propertys are different.Among the figure, m, n are natural number.
We think, the amplitude signal V that obtains by said method
mWith phase signal V
pCarrying out the projection result that projection obtains in coordinate plane is a kind of natural law of outwardness, concrete computation process by this step, this natural law is showed, and in subsequent step, utilize this natural law further to solve actual technical matters.
Step 6. analog to digital conversion.The amplitude signal V that obtains through step 5
mWith phase signal V
pBe d. c. voltage signal, need to be translated into digital signal, then be transferred to single-chip microcomputer and do the data processing.
Analog to digital conversion can be changed by the A/D modular converter that single-chip microcomputer inside carries, and also can finish with special A/D conversion integrated chip, and in order to obtain higher conversion accuracy, the present invention adopts the latter to finish this step.
Step 7. digital signal filter.Owing to may exist the phase mutual interference of circuit, power supply noise to disturb and electromagnetic interference (EMI), in analog input signal meeting stack cycle or the aperiodic undesired signal of A/D, and can be affixed in the quantized value, bring certain deterioration to signal.Consider real-time and the security of data acquisition, need to carry out filtering to the digital signal that step 6 is converted to and process, to reduce the impact of undesired signal as far as possible.
The present invention adopts middle position value filtering algorithm and arithmetic mean filter method to combine and carries out digital signal filter by mcu programming.
This step is optional step.
Step 8. self-adaptation interrupt request is judged.When changing measured material or when the measured material electromagnetic property is unknown, is then entering step 9 and again demarcate; When measured material is constant, then need not again to demarcate, redirect enters step 10 displacement calculating value.
Be called as the eddy current displacement pick-up unit in order to the hardware unit of realizing method of the present invention among the present invention, because the eddy current displacement pick-up unit is made of according to known circuit design framework components and parts well known in the art, therefore the eddy current displacement pick-up unit is used as all the time in the present invention an existing device and exists as the hardware environment of carrying out method of the present invention, therefore the eddy current displacement pick-up unit is not made detailed introduction, but this does not affect the enforcement of method of the present invention, and the concrete change of hardware environment can not produce substantial impact to method of the present invention yet.
The method that eddy current displacement pick-up unit of the present invention adopts the one-chip machine port level to change the generation interrupt request judges whether the eddy current displacement pick-up unit needs again to demarcate, when needs are demarcated the eddy current displacement pick-up unit again, press the button that designs on institute's hardware circuit, the request of giving an order in the eddy current displacement pick-up unit, after single-chip microcomputer detects interrupt request, will respond this request, enter step 9, the eddy current displacement pick-up unit is carried out automatic Calibration, so that the calibrating parameters of eddy current displacement pick-up unit adapts to the electromagnetic property of measured material automatically.If there is not interrupt request to produce, then enter step 10, carry out the calculating of shift value.
Step 9. pair eddy current displacement pick-up unit is demarcated.(hereinafter to be referred as the system) of eddy current displacement pick-up unit received can respond this interrupt request when again demarcating interrupt request, enters the automatic Calibration program, carries out flow process as shown in Figure 3.
Begin in calibration process, system can require the user to select three different positions in range ability, waiting system gathers related data, then carry out linear fit according to the data least square method of these three differences, calculate the slope k of fitting a straight line, then judge the electromagnetic property classification of material according to slope k.
As shown in Figure 4, pentagram d
1, d
2, d
3The V that expression eddy current displacement pick-up unit records at three diverse locations
mAnd V
pThen value adopts least square method that the data of these three points are carried out match, obtains straight line l
1, calculate l
1Slope k
1, because k
1=k
a≠ k
b≠ k
cTo metallic aluminium and copper similar electromagnetic property is arranged so can judge this kind material, and this similar electromagnetic property has determined select the one group calibrating parameters identical with metallic aluminium that the eddy current displacement pick-up unit is demarcated, and calibrating parameters is data acquisition by experiment.After demarcation was finished, system entered step 10, carried out the calculating of shift value.In like manner, l
2, l
3, l
4..., l
m, l
nCan adopt identical way to finish demarcation to the eddy current displacement pick-up unit.
The value of step 10. displacement calculating.Amplitude signal V
mWith phase signal V
pBe the electric signal that characterizes detected displacement d, the size of their values has reflected the size of displacement d.With amplitude signal V
mWith phase signal V
pMake ratio, and in coordinate system, carry out the value that projection calculates displacement d with displacement d.
As shown in Figure 5, eight little pentagram represent metallic aluminium when eight diverse locations, amplitude signal V
mWith phase signal V
pRatio V
m/ V
pWith the subpoint of displacement d, eight little rhombuses represent metallic copper when eight diverse locations, V
m/ V
pWith the subpoint of displacement d, because aluminium is similar with the copper electromagnetic property, so the V that records at eight diverse locations
m/ V
pApproximate overlapping, so we think the metal material of same electromagnetic characteristic is arranged, can set up displacement d and V with same function
m/ V
pRelations Among.By experiment, gather enough experimental datas, set up displacement d and V by the method for fitting of a polynomial
m/ V
pBetween functional relation, as shown in Equation (6).
D=F (V
m/ V
p) formula (6)
The material that will have different electromagnetic propertys is set up respectively displacement d and V
m/ V
pBetween function F (), so just can material displacement d and the V with different electromagnetism be described accordingly with function differently
m/ V
pBetween relation.Such as matched curve S among Fig. 5
1Can be used for describing displacement d and the V that a class material of similar electromagnetic property is arranged to aluminium, copper
m/ V
pBetween funtcional relationship, matched curve S
2With matched curve S
3Material displacement d and V that other two classes have different electromagnetic propertys are described respectively
m/ V
pBetween funtcional relationship.
Through the step of front, with the amplitude signal V that obtains
mWith phase signal V
pBring in the formula (6), just can calculate the value of displacement d.
Step 11. shows the displacement detecting result.System-computed obtains after the shift value, needs this result is shown intuitively by display device, shows etc. such as charactron demonstration, liquid crystal display.The present invention considers cost and practicality requirement, adopts charactron to carry out the result and shows.This step is optional step.
In the above-mentioned specific embodiment, particular content for the step that belongs to prior art is not introduced in detail, but these do not affect enforcement of the present invention, and the background technology that those of ordinary skill in the art fully can the introduction according to the present invention or other prior aries of this area are implemented not detailed disclosed step among these the application.
Those of ordinary skill in the art will appreciate that, embodiment described here is in order to help reader understanding's principle of the present invention, should to be understood to that protection scope of the present invention is not limited to such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not break away from essence of the present invention according to these technology enlightenments disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (3)
1. a self-adaptation Eddy current displacement detection method is characterized in that, comprises the steps:
Step 1. produces the sinusoidal signal of fixed frequency;
Step 2. is amplified sinusoidal signal;
Step 3. incentive probe coil;
Step 4. is obtained response signal;
Step 5. pair response signal is carried out log-transformation;
Step 6. analog to digital conversion;
Step 8. self-adaptation interrupt request is judged; When changing measured material or when the measured material electromagnetic property is unknown, is then entering step 9 and again demarcate; When measured material is constant, then need not again to demarcate, redirect enters step 10 displacement calculating value;
Step 9. pair eddy current displacement pick-up unit is demarcated;
The value of step 10. displacement calculating; Amplitude signal V
mWith phase signal V
pBe the electric signal that characterizes detected displacement d, the size of their values has reflected the size of displacement d.With amplitude signal V
mWith phase signal V
pMake ratio, and in coordinate system, carry out the value that projection calculates displacement d with displacement d.
2. a kind of self-adaptation Eddy current displacement detection method of prime number according to claim 1 is characterized in that, the specific implementation process of above-mentioned steps 5 is: to response signal U
rWhen carrying out the logarithm variation, select pumping signal U
1As the reference signal, as shown in Equation 5, with response signal U
rAmplitude and pumping signal U
1Amplitude do than and take the logarithm, then multiply by variation factor, and add a side-play amount, obtain amplitude signal V
mIn like manner, with response signal U
rPhase place and pumping signal U
1Phase place do poor and take the logarithm, then multiply by variation factor, and add a side-play amount, obtain phase signal V
p, V
mAnd V
pIt all is d. c. voltage signal.
V
p=-0.6log(|φ
r-φ
1|-90°)+0.9
3. a kind of self-adaptation Eddy current displacement detection method of prime number according to claim 1, it is characterized in that, the specific implementation process of above-mentioned steps 9 is: begin in calibration process, system can require the user to select three different positions in range ability, waiting system gathers related data, then carry out linear fit according to the data least square method of these three differences, calculate the slope k of fitting a straight line, then judge the electromagnetic property classification of material according to slope k.
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| CN104006731A (en) * | 2014-06-12 | 2014-08-27 | 株洲时代电子技术有限公司 | Centering sensing device and displacement detection method thereof |
| CN106248785A (en) * | 2016-08-05 | 2016-12-21 | 爱德森（厦门）电子有限公司 | A kind of automatic eddy-current flaw detecting method of self adaptation this bulk noise of mother metal change |
| CN109870098A (en) * | 2017-12-04 | 2019-06-11 | 北京自动化控制设备研究所 | A kind of unmanned plane rudder system method for detecting position |
| CN110260797A (en) * | 2019-06-18 | 2019-09-20 | 西安交通大学 | It is a kind of applied to perseverance/speed change grating signal adaptive filter method |
| CN111351839A (en) * | 2018-12-20 | 2020-06-30 | 核动力运行研究所 | Automatic calibration and calibration method for eddy current signals of heat transfer pipe |
| CN113138423A (en) * | 2021-03-12 | 2021-07-20 | 中国科学院信息工程研究所 | Metal detection method and device |
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| CN104006731A (en) * | 2014-06-12 | 2014-08-27 | 株洲时代电子技术有限公司 | Centering sensing device and displacement detection method thereof |
| CN106248785A (en) * | 2016-08-05 | 2016-12-21 | 爱德森（厦门）电子有限公司 | A kind of automatic eddy-current flaw detecting method of self adaptation this bulk noise of mother metal change |
| CN106248785B (en) * | 2016-08-05 | 2019-08-13 | 爱德森（厦门）电子有限公司 | A kind of automatic eddy-current flaw detecting method of adaptive this bulk noise of base material variation |
| CN109870098A (en) * | 2017-12-04 | 2019-06-11 | 北京自动化控制设备研究所 | A kind of unmanned plane rudder system method for detecting position |
| CN111351839A (en) * | 2018-12-20 | 2020-06-30 | 核动力运行研究所 | Automatic calibration and calibration method for eddy current signals of heat transfer pipe |
| CN111351839B (en) * | 2018-12-20 | 2023-08-22 | 核动力运行研究所 | Automatic calibration and verification method for vortex signal of heat transfer tube |
| CN110260797A (en) * | 2019-06-18 | 2019-09-20 | 西安交通大学 | It is a kind of applied to perseverance/speed change grating signal adaptive filter method |
| CN110260797B (en) * | 2019-06-18 | 2020-06-26 | 西安交通大学 | Adaptive filtering method applied to constant/variable-speed grating signals |
| CN113138423A (en) * | 2021-03-12 | 2021-07-20 | 中国科学院信息工程研究所 | Metal detection method and device |
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