CN1818716A - Ground measuring method of metal pipeline loading current underground - Google Patents
Ground measuring method of metal pipeline loading current underground Download PDFInfo
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- CN1818716A CN1818716A CN 200610038789 CN200610038789A CN1818716A CN 1818716 A CN1818716 A CN 1818716A CN 200610038789 CN200610038789 CN 200610038789 CN 200610038789 A CN200610038789 A CN 200610038789A CN 1818716 A CN1818716 A CN 1818716A
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Abstract
A ground measuring method of current loaded on underground metal pipeline includes loading AC signal with certain frequency on underground pipeline to confirm right-up position of said pipeline; measuring magnetic field intensity of said pipeline by top and bottom coils and converting it to be relevant two path AC voltage signal ;obtaining relevant DC voltage signal via preamplifier, switch capacity frequency-selective amplifier, rectifying circuit and signal nursing circuit; converting it to be digital amount ,sending the second digital amount to divider for obtaining quotient being sent to be the first multiplier ,the second multiplier ,third multiplier and a filter for obtaining current value loaded on said pipeline .
Description
Technical field
What the present invention relates to is a kind of ground survey method of underground metal pipeline loading current, belongs to the electronic measuring instrument technical field.
Background technology
In underground metal pipeline is surveyed, need on underground metal pipeline, to load an AC signal with transmitter, around pipeline, just can produce alternating magnetic field, survey this magnetic field intensity and the phase place trend and the buried depth of underground metal pipeline as can be known on the ground; Quality of the electric conductivity of the current value that is loaded and the voltage of adding AC signal, local soil property, the anticorrosive coat of underground metal pipeline etc. is relevant; For a underground metal pipeline, the total current value that its pipeline loads increases along with the increase of anticorrosive coat breaking point; And the current value of different location may be different on this root pipeline, leaves in the process of transmitter at pipeline, and every through its electric current of anticorrosive coat breaking point with regard to decline some electric current fall is big more, and its anticorrosive coat damaged degree is just serious more; In addition, near target pipeline, exist if any other metal pipe lines, then can on other pipelines, produce induction current and alternating magnetic field, bring influence, can't distinguish target pipeline when serious using the result who measures magnetic field intensity and the detection of phase method for position by electromagnetic induction.
In the underground metal pipeline detection process, the current value of measuring underground metal pipeline on the ground and being loaded, except the anticorrosive coat damaged condition that can measure underground metal pipeline, also can verify branch's situation of underground metal pipeline and conveniently from many metal pipe lines, find out target pipeline.This is that the electric current of responding on other pipelines is always less than the electric current on the target pipeline because the electric current sum on each take-off line equals the electric current on total pipeline.
The ground survey method of underground metal pipeline loading current does not have open report at present as yet.
Summary of the invention
The present invention proposes a kind of ground survey method that is used for the underground metal pipeline loading current, and this method need be with a transmitter and a receiver.
Technical solution of the present invention:
It is characterized in that its branch
Step 1, use transmitter load the AC signal of certain frequency on underground utilities;
Step 2, with Peak Intensity Method or zero method determine underground metal pipeline directly over the position;
Step 3, on the ground directly over the underground metal pipeline, measure the magnetic field intensity of the alternating magnetic field that metal pipe line produces simultaneously with upper and lower two coils separated by a distance, and be converted to corresponding two road ac voltage signals;
Step 4, above-mentioned two road ac voltage signals obtain corresponding two d. c. voltage signals respectively behind first, second prime amplifier, first, second switching capacity frequency-selecting amplifier, first, second detecting circuit, first, second signal conditioning circuit;
Step 5, two d. c. voltage signals are converted to the corresponding digital amount through analog quantity/digital quantity converter;
Step 6, with the divider that send of the digital quantity after second conversion, poor divided by between the digital quantity after two conversions, the merchant who obtains send first multiplier to multiply by distance between upper and lower coil;
Step 7, send second multiplier to multiply each other the digital quantity of step 6 gained result after second conversion, gained is long-pending again through the 3rd multiplier multiplication by constants;
Step 8, step 7 gained result is carried out digital filtering through digital filter, the current value that can obtain on the underground metal pipeline being loaded.
Principle of work of the present invention is based on when passing to certain electric current on the sufficiently long linear pattern conductor, and the electromagnetic intensity of its generation is to be linearity with the distance of leaving conductor to reduce.
Advantage of the present invention: have simple in structure, measure accurately, simple operation, strong, the low cost and other advantages of antijamming capability.
Description of drawings
Accompanying drawing 1 is a structured flowchart of the present invention;
Accompanying drawing 2 is embodiment circuit diagrams of transmitter;
The embodiment circuit diagram that accompanying drawing 3 receiver signals are handled.
The meaning of code name among the figure:
GD: underground utilities to be measured;
FSJ: transmitter;
JSJ: receiver;
L: the magnetic field that underground utilities to be measured are produced under transmitter institute plus signal
SXQ: go up coil;
XXQ: lower coil;
QZFD1, QZFD2: prime amplifier;
XPFD1, XPFD2: switching capacity frequency-selecting amplifier;
SZDL: clock generator;
JBQ1, JBQ2: wave detector;
TL1, TL2: signal conditioning circuit;
A/D1, A/D2: analog quantity/digital quantity converter;
JNF: subtracter;
CUF: divider;
CNF1, CNF2, CNF3: multiplier;
H: the distance between the upper and lower coil, span are 0.3～0.6 meter;
A: constant;
LBQ: digital filter;
I: the current value that calculates;
Embodiment
A kind of ground survey method of underground metal pipeline loading current, specifically it divides:
Step 1, use transmitter load the AC signal of certain frequency on underground utilities;
Step 2, with Peak Intensity Method or zero method determine underground metal pipeline directly over the position;
Step 3, on the ground directly over the underground metal pipeline, measure the magnetic field intensity of the alternating magnetic field that metal pipe line produces simultaneously with upper and lower two coils separated by a distance, and be converted to corresponding two road ac voltage signals;
Step 4, above-mentioned two road ac voltage signals are respectively through first, second prime amplifier QZFD1, QZFD2, first, second switching capacity frequency-selecting amplifier XPFD1, XPFD2, first, second detecting circuit JBQ1, JBQ2 obtain corresponding two d. c. voltage signal V1, V2 behind first, second signal conditioning circuit TL1, the TL2;
Step 5, d. c. voltage signal V1, V2 are converted to corresponding digital amount V1 ', V2 ' through analog quantity/digital quantity converter A/D1, A/D2;
Step 6, send divider CUF with digital quantity V2 ', poor divided by between digital quantity V2 ' and digital quantity V1 ', the merchant who obtains send the first multiplier CNF1 to multiply by distance between upper and lower coil SXQ, XXQ;
Step 7, send the second multiplier CNF2 to multiply each other with digital quantity V2 ' step 6 gained result, gained is long-pending again through the 3rd multiplier CNF3 multiplication by constants A;
Step 8, step 7 gained result is carried out digital filtering through digital filter LBQ, the current value I that can obtain on the underground metal pipeline being loaded.
The contrast accompanying drawing, the Ground Measuring Device of underground metal pipeline loading current divides transmitter and receiver, wherein receiver sub-signal processing section and calculation process part.
Described receiver signal processing section is made up of elements such as receiving coil, amplifier, resistance capacitances, finishes the magnetic field intensity of measuring the alternating magnetic field that underground metal pipeline produced, and is converted to the task of d. c. voltage signal.Wherein going up coil SXQ is connected in series successively, thereby obtains d. c. voltage signal V1 with the first prime amplifier QZFD1, the first switching capacity frequency-selecting amplifier XPFD1, first detector JBQ1, the first signal conditioning circuit TL1; Lower coil XXQ is connected in series successively, thereby obtains d. c. voltage signal V2 with the second prime amplifier QZFD2, second switch electric capacity frequency-selecting amplifier XPFD2, second detector JBQ2, secondary signal modulate circuit TL2; Clock generator SZDL is connected with first, second switching capacity frequency-selecting amplifier XPFD1, XPFD2 respectively, supplies with the required clock signal of switching capacity frequency-selecting amplifier.
Described receiver calculation process part is by a chip microcontroller, comprise two tunnel analog quantitys/digital quantity converter A/D1, A/D2 and whole subtraction, multiplication, division arithmetic and digital filtering, constants is provided with function, the magnetic field intensity signal computing of finishing the alternating magnetic field that will represent underground metal pipeline to produce is the task of the current value I that loaded on the underground metal pipeline.Two tunnel analog quantitys/input end of digital quantity converter A/D1, A/D2 connects the output of first, second signal conditioning circuit respectively, and DC voltage V1, the V2 of its output is converted to digital quantity V1, V2; Digital quantity V1, V2 connects two input ends of subtracter JNF respectively, the output terminal of subtracter JNF and digital quantity V2 connect the input end of divider CUF respectively, the output terminal of divider CUF connects two input ends of the first multiplier CNF1 with constant H, the output terminal of the first multiplier CNF1 connects two input ends of the second multiplier CNF2 with digital quantity V2, the output terminal of the second multiplier CNF2 connects two input ends of the 3rd multiplier CNF3 with constant A, the input end of the output termination digital filter LBQ of the 3rd multiplier CNF3 is in the current value I that obtains on the output terminal of digital filter LBQ being loaded on the final underground metal pipeline.
Single-chip microcomputer among the embodiment is selected INTEL 80C196KC20 for use, and its inside comprises 8 tunnel analog quantitys/digital quantity converter, and the present invention only uses wherein two, and its conversion reference voltage is decided to be 3.3V; All calculation process, constants are provided with function and are generated by system software.
Contrast accompanying drawing 2, transmitter comprises oscillation frequency dividing circuit, d type flip flop U13, power amplifier tube Q1, Q2 and transformer B, wherein the output terminal pin 5 of oscillation frequency dividing circuit connects the input end pin 3 of d type flip flop U13, the output terminal pin one, 2 of d type flip flop U13 connects the input end of power amplifier tube Q1, Q2 respectively, the primary coil of rate amplifier tube Q1, Q2 output termination transformer B.
Oscillation frequency dividing circuit comprises capacitor C 30, C31, resistance R 50, quartz oscillation crystal X2, vibration branch frequency circuit U12 forms oscillation frequency dividing circuit, capacitor C 30, C31 selects 20pf for use, resistance R 5 is 22M Ω, the frequency of operation of quartz oscillation crystal X2 is 38KHz, vibration branch frequency circuit U12 selects CD4060 for use, d type flip flop U13 can select CD4013 for use, resistance R 51, R52 is 4.7K Ω, high-power FET Q1, Q2 can select RIF450 for use, the rated power of transformer B is 30W, primary voltage is 12V * 2, secondary voltage is many taps of 12V～100V, vibration branch frequency circuit U12, the supply voltage of d type flip flop U13 integrated circuit is 5V, and the supply voltage of power-amplifier stage is 12V.
Contrast Fig. 3, the last coil SXQ of receiver is the same with lower coil XXQ, is that the ferrite bar of wearing Φ 10 * 100mm with the enameled wire of Φ 0.1mm around 2500 circles, centre on the skeleton of Φ 12 * 70 forms; Last coil SXQ and capacitor C 1 are formed the shunt-resonant circuit, and its resonance frequency is identical with the frequency of operation of transmitter, is 593.75Hz, and capacitor C 1 is the CBB electric capacity of 0.22uF; Operational amplifier U1 and resistance R 1, R2, capacitor C 2 are formed prime amplifier, and resistance R 1 is that 10K Ω, resistance R 2 are 1K Ω, and C2 is 4700PF, and this moment, the enlargement factor of prime amplifier was about 11 times; Capacitor C 3, C4, resistance R 3, R4, R5, R6, R7, R8, R9 and switching capacity band logical frequency-selecting amplification special IC U2 forms the logical frequency-selecting amplifier of a quadravalence switching capacity band, and the logical centre frequency of its band is add 1/100 of clock frequency.The clock frequency of present embodiment is 59375Hz, so the logical centre frequency of band is 593.75Hz, capacitor C 3 is 0.47uF, and resistance R 3, R6 are 10K Ω, and resistance R 4, R7 are 5.1K Ω, resistance R 5, R7 are 68K Ω, resistance R 9 is 4.7K Ω, and capacitor C 4 is 0.047uF, and the logical frequency-selecting amplifier special IC U2 model of switching capacity band is MF10, the centre frequency enlargement factor of the logical frequency-selecting amplifier of this band is about 50 times when selecting above parameter for use, and the Q value is greater than 25; Switching diode D1, resistance R 10, R11, capacitor C 5, C6 and operational amplifier U3 form detecting circuit, the alternating signal of the logical frequency-selecting amplifier output of switching capacity band is converted to direct current signal, and switching diode D1 is that 1N4148, resistance R 10, R11 are that 10K Ω, capacitor C 5 are 10uF for 4.7uF, C6; Operational amplifier U4, resistance R 12, potentiometer W1 form signal conditioning circuit, the direct current signal of detecting circuit output is amplified to suitable amplitude, adjust the enlargement factor that potentiometer W1 can change signal conditioning circuit, resistance R 12 is 10K Ω for 1K Ω, potentiometer W1.
Lower coil XXQ believes that with last coil to DC voltage the part of V1 is just the same to the circuit theory of constitution of DC voltage V2 part, H place below the coil SXQ on distance, the installation site of its lower coil XXQ; The H span is 0.3～0.6 meter, and embodiment gets 0.5 meter.
Clock generating circuit is made up of capacitor C 13, C14, resistance R 25, quartz oscillation crystal X1, vibration branch frequency circuit U9, capacitor C 13, C14 are 20PF, resistance R 25 is 22M Ω, the frequency of operation of quartz oscillation crystal X1 is 1.9MHz, U9 selects CD4060 for use, operational amplifier among the embodiment all can be selected the general-purpose operation amplifier for use, as LM741 etc.The working power voltage of circuit is ± 5V.
The enlargement factor of the enlargement factor of the magnetoconductivity of the number of turn of the size of constant A and last coil SXQ, lower coil XXQ, size, FERRITE CORE, frequency of operation, circuit, the detection efficiency of wave detector, signal conditioning circuit, the reference voltage size of A/D converter are relevant, but constant A has also just been determined after circuit parameter is determined, can do to demarcate when the receiver machine debugging and adjust.When adopting the circuit parameter of present embodiment, constant A is 45.
Claims (3)
1, a kind of ground survey method of underground metal pipeline loading current is characterized in that its branch:
Step 1, use transmitter load the AC signal of certain frequency on underground utilities;
Step 2, with Peak Intensity Method or zero method determine underground metal pipeline directly over the position;
Measure the magnetic field intensity of the alternating magnetic field of metal pipe line generation with upper and lower two coils separated by a distance in the receiver simultaneously on step 3, the ground directly over underground metal pipeline, and be converted to corresponding two road ac voltage signals;
Step 4, above-mentioned two road ac voltage signals obtain corresponding two d. c. voltage signals respectively behind first, second prime amplifier, first, second switching capacity frequency-selecting amplifier, first, second detecting circuit, first, second signal conditioning circuit;
Step 5, two d. c. voltage signals are converted to the corresponding digital amount through analog quantity/digital quantity converter;
Step 6, send divider with the second digit amount, poor divided by between the two-digit amount, the merchant who obtains send first multiplier to multiply by distance between upper and lower coil;
Step 7, send second multiplier to multiply each other with the second digit amount step 6 gained result, gained is long-pending again through the 3rd multiplier multiplication by constants;
Step 8, step 7 gained result is carried out digital filtering through digital filter, the current value that can obtain on the underground metal pipeline being loaded.
2, the ground survey method of a kind of underground metal pipeline loading current as claimed in claim 1, it is characterized in that receiver sub-signal processing section and calculation process part, wherein go up coil in the signal processing and be connected in series successively with the first switching capacity frequency-selecting amplifier, first detector, first signal conditioning circuit; Lower coil and second switch electric capacity frequency-selecting amplifier, second detector, the secondary signal modulate circuit is connected in series successively; Clock generator is connected with first, second switching capacity frequency-selecting amplifier respectively; In the calculation process part first, second analog quantity/digital quantity converter input end connect signal processing first respectively, the output terminal of secondary signal modulate circuit, first, the output terminal of second analog quantity/digital quantity converter connects the input end of subtracter respectively, the output terminal of the output terminal of subtracter and second analog quantity/digital quantity converter connects two input ends of divider respectively, the output terminal of divider connects two input ends of first multiplier with constant H, the output terminal while of second analog quantity/digital quantity converter and two input ends of output termination second multiplier of first multiplier, the output terminal of second multiplier connects two input ends of the 3rd multiplier, the input end of the output termination digital filter LBQ of the 3rd multiplier with constant A.
3, the ground survey method of a kind of underground metal pipeline loading current as claimed in claim 1, it is characterized in that transmitter comprises oscillation frequency dividing circuit, d type flip flop U13, power amplifier tube Q1, Q2 and transformer B, wherein the output terminal pin (5) of oscillation frequency dividing circuit connects the input end pin (3) of d type flip flop U13, the output terminal pin of d type flip flop U13 (1,2) connects the input end of two power amplifier tubes respectively, the primary coil of two rate amplifier tube output termination transformer B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100387895A CN100480733C (en) | 2006-03-13 | 2006-03-13 | Ground measuring method of metal pipeline loading current underground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100387895A CN100480733C (en) | 2006-03-13 | 2006-03-13 | Ground measuring method of metal pipeline loading current underground |
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| Publication Number | Publication Date |
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| CN1818716A true CN1818716A (en) | 2006-08-16 |
| CN100480733C CN100480733C (en) | 2009-04-22 |
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| CNB2006100387895A Expired - Fee Related CN100480733C (en) | 2006-03-13 | 2006-03-13 | Ground measuring method of metal pipeline loading current underground |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262173A (en) * | 2011-04-19 | 2011-11-30 | 天津市嘉信技术工程公司 | Method for measuring buried depth of buried pipeline, size and direction of stray current and geomagnetic azimuth angle |
| CN101535843B (en) * | 2006-09-01 | 2012-11-28 | 秦内蒂克有限公司 | Metal object detecting apparatus |
| CN104020493A (en) * | 2014-06-16 | 2014-09-03 | 欧阳庆丰 | High-sensitivity line finder |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8815314D0 (en) * | 1988-06-28 | 1988-08-03 | Radiodetection Ltd | Improvements relating to underground pipe & cable location |
| CN1206529C (en) * | 2003-07-08 | 2005-06-15 | 刘崧 | Gronnd surface electric measuing method for detecting underground metal pipeline corrusion state |
| CN100337126C (en) * | 2005-05-25 | 2007-09-12 | 淄博威特电气有限公司 | Method and apparatus for judging between right and wrong tracking and discriminating pipeline in metal pipeline detection |
| CN1297824C (en) * | 2005-05-25 | 2007-01-31 | 南京工业大学 | Method for detecting run of underground metal pipeline |
| CN100337127C (en) * | 2005-05-25 | 2007-09-12 | 淄博威特电气有限公司 | Method and apparatus for visual indication of line location in metal pipe exploration |
-
2006
- 2006-03-13 CN CNB2006100387895A patent/CN100480733C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101535843B (en) * | 2006-09-01 | 2012-11-28 | 秦内蒂克有限公司 | Metal object detecting apparatus |
| CN102262173A (en) * | 2011-04-19 | 2011-11-30 | 天津市嘉信技术工程公司 | Method for measuring buried depth of buried pipeline, size and direction of stray current and geomagnetic azimuth angle |
| CN102262173B (en) * | 2011-04-19 | 2013-11-20 | 天津市嘉信技术工程公司 | Method for measuring buried depth of buried pipeline, size and direction of stray current and geomagnetic azimuth angle |
| CN104020493A (en) * | 2014-06-16 | 2014-09-03 | 欧阳庆丰 | High-sensitivity line finder |
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| CN100480733C (en) | 2009-04-22 |
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Granted publication date: 20090422 Termination date: 20100313 |