CN108226279A - Towards the special fluxgate detector of buried corrosion pipeline - Google Patents
Towards the special fluxgate detector of buried corrosion pipeline Download PDFInfo
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- CN108226279A CN108226279A CN201711486899.2A CN201711486899A CN108226279A CN 108226279 A CN108226279 A CN 108226279A CN 201711486899 A CN201711486899 A CN 201711486899A CN 108226279 A CN108226279 A CN 108226279A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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Abstract
The invention discloses a kind of special fluxgate detectors towards buried corrosion pipeline.Including excitation module, probe, lock phase amplification module, signal acquisition module.The probe includes pop one's head in input terminal, probe output terminal.Probe input terminal is used to input the pumping signal.The probe output terminal is used to export inductive signal.The lock phase amplification module is connect with the excitation module, for inputting the inductive signal and the reference signal, and exports the direct current signal for calculating tested magnetic field.The signal acquisition module is connect with the excitation module, and tested magnetic field intensity is obtained for handling the direct current signal.The special fluxgate detector towards buried corrosion pipeline has the advantages that detection accuracy is high to faint tested magnetic field.
Description
Technical field
The present invention relates to field of detecting, more particularly to a kind of special fluxgate detector towards buried corrosion pipeline.
Background technology
Buried pipe network is the important component of urban infrastructure, is the means of transport of combustion gas, draining, feedwater etc..By
It is influenced in by external environment (rainwater and soil etc.), buried pipe network is easily by corrosion, in order to ensure the normal of buried pipe network
Work and safe operation, to the corrosion situation of pipe network inspect periodically most important.Due to the detection of the buried pipeline of corrosion
Environment is complicated, and weak output signal, traditional buried pipe network monitoring device be not high to faint signal detection precision, usually occurs
Erroneous judgement.
Invention content
Based on this, it is necessary to for traditional, traditional buried pipe network monitoring device to the faint letter of the buried pipeline of corrosion
The problem of number detection accuracy is not high, provides a kind of detection accuracy the high special fluxgate detector towards buried corrosion pipeline.
A kind of special fluxgate detector towards buried corrosion pipeline, including：
Module is encouraged, for output drive signal and reference signal；
Probe, for sensing tested magnetic field, including：
Probe input terminal, for inputting the pumping signal,
Probe output terminal, for exporting inductive signal；
Phase amplification module is locked, is connect with the excitation module, for inputting the inductive signal and the reference signal, and
Output calculates the direct current signal in tested magnetic field；
Signal acquisition module is connect with the excitation module, and tested magnetic field intensity is obtained for handling the direct current signal.
The excitation module includes in one of the embodiments,：
Wave generator circuit, for exporting the pumping signal and the reference signal；
Power amplification circuit is connected between the wave generator circuit and the probe input terminal, described for amplifying
Pumping signal；
The lock phase amplification module is connect, and export and be used for respectively with the wave generator circuit and the probe output terminal
Calculate the direct current signal in tested magnetic field.
Low-pass filter circuit is further included in one of the embodiments, and the low-pass filter circuit is connected to the lock phase
Between amplification module and the signal acquisition module.
The lock phase amplification module includes sequentially connected pre-amplification circuit in one of the embodiments, band logical is filtered
Wave circuit, phase-sensitive detection circuit and the phase-shift circuit being connect with phase-sensitive detection circuit, the phase-shift circuit are described for inputting
Reference signal.
It further includes and is sequentially connected between the wave generator circuit and the phase-shift circuit in one of the embodiments,
Comparator and frequency multiplier.
The lock phase amplification module further includes the output being connect with the pre-amplification circuit in one of the embodiments,
Hold zeroing circuit.
Isolation is connected between the wave generator circuit and the power amplification circuit in one of the embodiments, to become
Depressor, the isolating transformer include primary coil and secondary coil, and the primary coil is defeated with the wave generator circuit
Outlet connects, and the secondary coil is connect with the input terminal of the power amplification circuit.
The power amplification circuit includes sequentially connected voltage follower, preposition amplification in one of the embodiments,
Device and power amplifier, the secondary coil are connect with the voltage follower.
The signal acquisition module is included at sequentially connected AD conversion unit and signal in one of the embodiments,
Manage unit.
Inclination angle collecting unit is further included in one of the embodiments, the inclination angle collecting unit is connected with the probe,
For acquiring the angle data of the axis of the probe and horizontal plane.
Special fluxgate detector provided by the invention towards buried corrosion pipeline can be sensed micro- by the probe
Weak tested magnetic field, and inductive signal is handled to obtain the direct current that can be derived that tested magnetic field intensity letter by locking phase amplification module
Number.Therefore the special fluxgate detector towards buried corrosion pipeline is high with detection accuracy to faint tested magnetic field
Advantage.
Description of the drawings
Fig. 1 is the special fluxgate detector module figure provided in an embodiment of the present invention towards buried corrosion pipeline；
Fig. 2 is sonde configuration schematic diagram provided in an embodiment of the present invention；
Fig. 3 is wave generator circuit figure provided in an embodiment of the present invention；
Fig. 4 is power amplification circuit figure provided in an embodiment of the present invention；
Fig. 5 is low-pass filter circuit figure provided in an embodiment of the present invention；
Fig. 6 is pre-amplification circuit provided in an embodiment of the present invention and output terminal zeroing circuit figure；
Fig. 7 is bandwidth-limited circuit figure provided in an embodiment of the present invention；
Fig. 8 is phase-sensitive detection circuit circuit diagram provided in an embodiment of the present invention；
Fig. 9 is phase-shift circuit figure provided in an embodiment of the present invention.
Main element symbol description
Special fluxgate detector 10, probe 100, probe input terminal 110, probe output terminal towards buried corrosion pipeline
120th, magnetic core 130, excitation coil 131, induction coil 132, excitation module 200, wave generator circuit 210, waveform generator
211st, the first output terminal 212, second output terminal 213, power amplification circuit 220, voltage follower 221, preamplifier 222,
Power amplifier 223, isolating transformer 250, primary coil 251, secondary coil 252, lock phase amplification module 300, phase-shift circuit
310th, pre-amplification circuit 320, bandwidth-limited circuit 330, output terminal zeroing circuit 340, phase-sensitive detection circuit 350, signal are adopted
Collect module 400, AD conversion unit 410, signal processing unit 420, low-pass filter circuit 510, comparator 520, frequency multiplier
530th, inclination angle collecting unit 540.
Specific embodiment
In order to which the goal of the invention, technical solution and the technique effect that make the present invention are more clearly understood, below in conjunction with attached drawing pair
Specific embodiments of the present invention are described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention,
It is not intended to limit the present invention.
Fig. 1 is referred to, the embodiment of the present invention provides a kind of special fluxgate detector 10 towards buried corrosion pipeline.Face
Include excitation module 200, probe 100, lock phase amplification module 300, signal to the special fluxgate detector of buried corrosion pipeline
Acquisition module 400.The probe 100 includes probe input terminal 110, probe output terminal 120.The excitation module 200 is for defeated
Go out pumping signal and reference signal.The probe 100 is used to sense tested magnetic field.The probe input terminal 110 is used to input institute
State pumping signal.The probe output terminal 120 is used to export inductive signal.The lock phase amplification module 300 and the excited modes
Block 200 connects, and for inputting the inductive signal and the reference signal, and exports the direct current signal for calculating tested magnetic field.Institute
It states signal acquisition module 400 to connect with the excitation module 200, tested magnetic field intensity is obtained for handling the direct current signal.
The pumping signal that the excitation module 200 exports can encourage the probe 100 to generate inductive signal.The inductive signal can be with
For induced voltage.The second harmonic component of voltage directly proportional to tested magnetic-field component is included in the inductive signal.The excitation
Comparison processing exports the direct current after pumping signal and reference signal input the lock phase amplification module 300 that module 200 exports
Signal.The direct current signal carries and is tested the relevant physical quantity in magnetic field.By the signal acquisition module 400 to described straight
Stream signal is sampled, is analyzed, handling the intensity that can obtain tested magnetic field.
Special fluxgate detector 10 of the present invention towards buried corrosion pipeline can pass through 100 sense of probe
Faint tested magnetic field is answered, and inductive signal is obtained can be derived that tested magnetic field intensity by locking the processing of phase amplification module 300
Direct current signal.Therefore the special fluxgate detector 10 towards buried corrosion pipeline has faint tested magnetic field and visits
Survey advantage with high accuracy.
Fig. 2 is referred to, the probe 100 can be differential configuration.Differential configuration can inhibit in induced voltage with tested magnetic
The unrelated fundametal compoment of field intensity.The probe 100 can include two spaced magnetic cores 130.Each magnetic core 130
Including opposite both ends.Two magnetic cores 130 one end in the same direction can be connected by same root excitation coil 131.It is described to swash
The probe input terminal 110 can be used as by encouraging coil 131.The other end in the same direction of two magnetic cores 130 can also pass through one
Root induction coil 132 is intertwined and connected.The induction coil 132 is as the probe output terminal 120.The magnetic core 130 can be
Cobalt base amorphous state magnetically soft alloy material.The cobalt base amorphous state magnetically soft alloy material has high magnetic permeability, low-coercivity and low
The advantages of magnetic field saturation intensity.The excitation module 200 can input the pumping signal by the excitation coil 131.Institute
It can be alternating magnetic field signal to state pumping signal.
Magnetic field intensity inside two magnetic cores 130 is equal to tested the sum of magnetic field intensity and alternating magnetic field signal.Work as quilt
When survey magnetic field intensity intensity is not zero, the time that two magnetic cores 130 enter saturation region will be caused different, so that magnetic induction intensity
It is asymmetric.The induced voltage related with tested magnetic field can be induced in the induction coil 132.Since the modulation of magnetic conductivity is made
With the second harmonic ingredient of the induced voltage is directly proportional to the intensity in tested magnetic field.Therefore, by detecting the second harmonic
Signal can obtain tested magnetic field relevant information.The lock phase amplification module 300 passes through to probe output terminal 120 output
The induced voltage handles to obtain the direct current signal, and the direct current signal is related to the second harmonic signal.The letter
Number acquisition module 400 obtains the intensity in tested magnetic field by handling the direct current signal.Pass through the intensity in the tested magnetic field
Can identify generate magnetic field specific substance, so as to judge pipeline whether corrosion.Have the advantages that with high accuracy.
The excitation module 200 includes wave generator circuit 210, power amplification circuit in one of the embodiments,
220.The wave generator circuit 210 is used to export the pumping signal and the reference signal.The power amplification circuit 220
It is connected between the wave generator circuit 210 and the probe input terminal 110.For amplifying the pumping signal.The lock
Phase amplification module 300 is connect respectively with the wave generator circuit 210 and the probe output terminal 120, and exports to calculate
The direct current signal in tested magnetic field.
Fig. 3 is referred to, the wave generator circuit 210 includes waveform generator 211 in one of the embodiments,.Institute
Waveform generator 211 is stated for generating the pumping signal.The pumping signal is after the power amplification circuit 220 amplification
Input the probe input terminal 110.The model of the waveform generator 211 can be that the high-precision function of MAX038 types occurs
Device.The MAX038 types high precision waveform generator can generate sine wave, square wave and triangular wave, have reference frequency output
Wide, the advantages that temperature drift is low, the linearity is high.The wave generator circuit 210 can also include be series at ground wire and it is described
Potentiometer RP2, resistance R4 between the 8th pin of function generator.The wave generator circuit 210 can also include being series at connecing
Potentiometer RP1, resistance R3 between the 10th pin of ground wire and the waveform generator 211.Draw the 7th of the function generator
Foot, the 6th pin ground connection.The potentiometer Rp1 for adjusting the 7th pin can adjust output waveform frequency.Draw the 5th of the function generator
Capacitance C5 is connected between foot and ground wire.The function generator inputs constant input current to 5 foot institutes using the 7th pin
Capacitance C5 charging and discharging are connect, and then form oscillation, generate triangular wave or square wave.The capacitance C5 can influence output frequency
Rate.3rd pin of the function generator and the 4th pin can be connected with resistance R2 and resistance R1 and ground wire respectively.It is described
3rd pin and the 4th pin can also be connect with waveform selection switch K respectively.The shape of K is switched by changing the waveform selection
State can export waveform of different shapes in the 19th pin.It is defeated to include first for the 19th pin in one of the embodiments,
Outlet 212 and second output terminal 213.First output terminal 212 exports the pumping signal.The pumping signal is sine
Wave.The second output terminal 213 exports the reference signal.
Fig. 4 is referred in one of the embodiments, between the wave generator circuit and the power amplification circuit to connect
It is connected to isolating transformer 250.The isolating transformer 250 includes primary coil 251 and secondary coil 252.The primary coil
251 connect with the output terminal of the wave generator circuit 210, and the secondary coil 252 is defeated with the power amplification circuit 220
Enter end connection.The isolating transformer 250 is used for electrical isolation.
The power amplification circuit 220 is put including sequentially connected voltage follower 221, preamplifier 222 and power
Big device 223, the secondary coil 252 are connect with the voltage follower 221.The both ends of the secondary coil 252 connect respectively
In the pressure follower.The preamplifier 222 is used to amplify voltage.The reverse input end of the voltage follower 221 with
The output terminal connection of the voltage follower 221.The output terminal of the voltage follower 221 passes through coupled capacitor C14, resistance
R21 is grounded.The output terminal of the voltage follower 221 also passes through the in the same direction defeated of coupled capacitor C14 and the preamplifier 222
Enter end connection.The reverse input end of the preamplifier 222 is grounded by resistance R22.The preamplifier 222 it is in the same direction
Input terminal is connected with the output terminal of the preamplifier 222 by resistance R23.The output terminal of the preamplifier 222 leads to
Overcoupling capacitance C15 is connect with the noninverting input of the power amplifier 223.The coupled capacitor C15 is connect by resistance R24
Ground.The reverse input end of the power amplifier 223 is grounded by resistance R25, capacitance C16.The power amplifier 223 it is anti-
It is also connect to input terminal by resistance R26 with the output terminal of the power amplifier 223.The output of the power amplifier 223
End is grounded by sequentially connected resistance R27, capacitance C16.The resistance R27, capacitance C16 are used to inhibit high-frequency noise.It is described
The output terminal of power amplifier 223 passes through the amplified signal of capacitance C17 output powers.The capacitance C17 has filtering blocking
Function.The power amplifier 223 can be LM1875 chips.
Fig. 5 is referred to, in one of the embodiments, the special fluxgate detector 10 towards buried corrosion pipeline
Further include low-pass filter circuit 510.The low-pass filter circuit 510 is connected to the lock phase amplification module 300 and described information
Between acquisition module 400.The low-pass filter circuit interferes for filter high-frequency.The low-pass filter circuit can include operation
Amplifier A10.The lock phase amplification module is connect by resistance R19 with the operational amplifier A 10.The operational amplifier
The reverse input end of A10 is grounded by resistance R18.The reverse input end of the operational amplifier A 10 by resistance R20 with it is described
The output terminal connection of operational amplifier A 10.The resistance R19 is also grounded by capacitance C12.The operational amplifier A 10 is just
It is also grounded to input terminal by capacitance C13.
The lock phase amplification module includes sequentially connected pre-amplification circuit 320, band logical in one of the embodiments,
Filter circuit 330, phase-sensitive detection circuit 350 and the phase-shift circuit 310 being connect with phase-sensitive detection circuit 350.The phase shift electricity
Road 310 is used to input the reference signal.The pre-amplification circuit 320 is used to amplify second harmonic signal.The band logical filter
The centre frequency of wave circuit 330 is the frequency of second harmonic signal, to select the second harmonic signal of induced voltage, and gives institute
State phase-sensitive detection circuit 350.The phase-sensitive detection circuit 350 is used for defeated by the second harmonic signal and the reference signal
Go out the direct current signal.The phase-shift circuit 310 is used to ensureing the secondary of the phase of the reference signal and the induced voltage
Harmonic signal phase is consistent.
Fig. 6 is referred to, the pre-amplification circuit 320 can be including having the function of the instrument amplification of low noise, low imbalance
Device A2.The instrumentation amplifier A2 includes chip I NA101M.It can be connected into the chip I NA101M including two with mutually knot
The operational amplifier of structure and an operational amplifier for being connected into difference structure, it is defeated which is conducive to further suppress probe 100
The noise signal gone out.The instrumentation amplifier A2 can be connected with resistance RG.The voltage amplification factor of the instrumentation amplifier A2
Equal to (1+40K/RG).Adjust the amplification factor that the resistance RG can adjust the pre-amplification circuit 320.The preposition amplification
Circuit 320 can be connect with the probe output terminal 120.
The lock phase amplification module 300 is further included in one of the embodiments, connect with the pre-amplification circuit 320
Output terminal zeroing circuit 340.The output terminal zeroing circuit 340 is connect with the zeroing interface of the pre-amplification circuit 320.
The output terminal zeroing circuit 340 is for making the pre-amplification circuit 320 be zeroed, to improve the accuracy of output signal.Institute
It states output terminal zeroing circuit 340 and further includes operational amplifier A 3.The reverse input end of the operational amplifier A 3 is connected to described
The zeroing interface of pre-amplification circuit 320, and connect with the output terminal of the operational amplifier A 3.The operational amplifier A 3
Noninverting input is grounded by resistance R8, and is passed through resistance R9, RP3 and be connected to power supply.
Fig. 7 is referred to, the bandwidth-limited circuit 330 includes operational amplifier A 4, operational amplifier A 5.The operation is put
The output terminal of big device A4 is connect by resistance R13 with the reverse input end of the operational amplifier A 5.The operational amplifier A 4
Output terminal pass through capacitance C8, resistance R11 ground connection.The pre-amplification circuit 320 is accessed by the resistance R10, capacitance C9
The reverse input end of the operational amplifier A 4.The output terminal and reverse input end of the operational amplifier A 4 pass through resistance R12
Connection.The positive input of the operational amplifier A 5 is grounded by resistance R15.Resistance C14 and capacitance C10 are parallel to the fortune
Between the output terminal and reverse input end of calculating amplifier A5.The centre frequency of the bandwidth-limited circuit 330 by C8, C9, R11,
R12 parameters size determines that size is equal toBig loop is introduced by R15 in filter circuit
Positive feedback is conducive to improve signal quality.
Fig. 8 is referred to, the phase-sensitive detection circuit 350 includes control chip ad630 in one of the embodiments,.With
And operational amplifier A 6, operational amplifier A 7, the operational amplifier A 8 being connect with the control chip.The operational amplifier A 6
Output terminal connect with the first pin of the control chip ad630.The operational amplifier A 6 is used to input the induced electricity
The second harmonic signal of pressure.The operational amplifier A 7 is used to input the reference signal.The phase-sensitive detection circuit 350 also wraps
Include operational amplifier A 8.The positive input of the operational amplifier A 8 is connect with the 13rd pin of the control chip ad630.
The output terminal of the operational amplifier A 8 is used to export the direct current signal.
Fig. 9 is referred to, the phase-shift circuit 310 includes operational amplifier A 9 in one of the embodiments,.Resistance R7 connects
It is connected between the reverse input end of the operational amplifier A 9 and positive output terminal.Resistance R16 is connected to the operational amplifier
The reverse input end of A9.Capacitance C20 is connected to the positive input of the operational amplifier A 9.The capacitance C20 is used to input
The reference signal.The positive input of the operational amplifier A 9 is also grounded by variable capacitance RP4.
Described further included towards buried corrosion pipeline fluxgate detection 10 is sequentially connected to institute in one of the embodiments,
State the comparator 520 and frequency multiplier 530 between wave generator circuit 210 and the phase-shift circuit 310.The comparator 520 is used
In pumping signal is become rectangular wave from sine wave.The doubling frequency of the rectangular wave can be obtained institute by the frequency multiplier 530
State reference signal.
The signal acquisition module 400 includes sequentially connected 410 He of AD conversion unit in one of the embodiments,
Signal processing unit 420.The AD conversion unit 410 is used to the direct current signal being converted to digital signal.The signal
Processing unit 420 is used to handle the intensity that the digital signal obtains being tested magnetic field.
The special fluxgate detector 10 towards buried corrosion pipeline further includes inclination angle in one of the embodiments,
Collecting unit 540.The inclination angle collecting unit 540 100 connect with the probe, for acquire the axis of the probe 100 and
The angle data of horizontal plane.What the special fluxgate detector 10 towards buried corrosion pipeline detected is tested magnetic field in institute
State the axial component of probe 100.It should be perpendicular to horizontal plane during 100 work of probe.The inclination angle collecting unit 540 can pick
Except the influence of the invalid data that generates to result of detection when the attitude misalignment of the probe 100, to increase detection accuracy.At it
In middle one embodiment, the spy inclination angle collecting unit 540 is digitlization sensor.It is contained inside the digitlization sensor
The micro- capacitance sensor of one silicon-sensitive, eeprom memory, signal amplifier, A/D converter and SPI serial communication interfaces, tool
There are high-res, low noise.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.On the contrary, when element be referred to as " directly existing " another element " on " when,
There is no intermediary elements.Term as used herein " vertically ", " horizontal ", "left", "right" and similar statement are
For illustrative purposes.
Embodiment described above only expresses the several embodiments of the present invention, and description is more specific and detailed, but simultaneously
Cannot the limitation to the scope of the claims of the present invention therefore be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of special fluxgate detector towards buried corrosion pipeline, which is characterized in that including：
Module (200) is encouraged, for output drive signal and reference signal；
It pops one's head in (100), for sensing tested magnetic field, including：
Probe input terminal (110), for inputting the pumping signal,
Probe output terminal (120), for exporting inductive signal；
Phase amplification module (300) is locked, is connect with the excitation module (200), for inputting the inductive signal and the reference
Signal, and export the direct current signal for calculating tested magnetic field；
Signal acquisition module (400) is connect with the excitation module (200), and tested magnetic is obtained for handling the direct current signal
Field intensity.
2. as described in claim 1 towards the special fluxgate detector of buried corrosion pipeline, which is characterized in that the excitation
Module (200) includes：
Wave generator circuit (210), for exporting the pumping signal and the reference signal；
Power amplification circuit (220) is connected between the wave generator circuit (210) and the probe input terminal (110), uses
In the amplification pumping signal；
The lock phase amplification module (300) connects respectively with the wave generator circuit (210) and the probe output terminal (120)
It connects, and exports the direct current signal for calculating tested magnetic field.
3. as described in claim 1 towards the special fluxgate detector of buried corrosion pipeline, which is characterized in that further include low
Bandpass filter circuit (510), the low-pass filter circuit (510) is connected to the lock phase amplification module (300) and the signal is adopted
Between collection module (400).
4. as claimed in claim 2 towards the special fluxgate detector of buried corrosion pipeline, which is characterized in that the lock phase
Amplification module (300) includes sequentially connected pre-amplification circuit (320), bandwidth-limited circuit (330), phase-sensitive detection circuit
(350) and with phase-sensitive detection circuit (350) phase-shift circuit (310) connecting, the phase-shift circuit (310) is for inputting
State reference signal.
5. as claimed in claim 4 towards the special fluxgate detector of buried corrosion pipeline, which is characterized in that further include according to
The secondary comparator (520) and frequency multiplier being connected between the wave generator circuit (210) and the phase-shift circuit (310)
(530)。
6. as claimed in claim 4 towards the special fluxgate detector of buried corrosion pipeline, which is characterized in that the lock phase
Amplification module (300) further includes the output terminal zeroing circuit (340) being connect with the pre-amplification circuit (320).
7. as claimed in claim 2 towards the special fluxgate detector of buried corrosion pipeline, which is characterized in that the waveform
Occur to be connected with isolating transformer (250), the isolating transformer between circuit (210) and the power amplification circuit (220)
(250) including primary coil (251) and secondary coil (252), the primary coil (251) and the wave generator circuit
(210) output terminal connection, the secondary coil (252) connect with the input terminal of the power amplification circuit (220).
8. as claimed in claim 7 towards the special fluxgate detector of buried corrosion pipeline, which is characterized in that the power
Amplifying circuit (220) includes sequentially connected voltage follower (221), preamplifier (222) and power amplifier (223),
The secondary coil (252) connect with the voltage follower (221).
9. as described in claim 1 towards the special fluxgate detector of buried corrosion pipeline, which is characterized in that the signal
Acquisition module (400) includes sequentially connected AD conversion unit (410) and signal processing unit (420).
10. as described in claim 1 towards the special fluxgate detector of buried corrosion pipeline, which is characterized in that further include
Inclination angle collecting unit (540), the inclination angle collecting unit (540) connect with the probe (100), for acquiring the probe
(100) axis and the angle data of horizontal plane.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327368A (en) * | 2020-10-29 | 2021-02-05 | 电子科技大学 | Ultra-deep metal pipeline buried depth detection equipment and use method thereof |
| CN114076875A (en) * | 2020-08-20 | 2022-02-22 | 中国石油天然气股份有限公司 | Device for detecting insulating property |
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