CN112130502A - Three-axis data acquisition system and method for pipeline magnetic flux leakage internal detector - Google Patents

Three-axis data acquisition system and method for pipeline magnetic flux leakage internal detector Download PDF

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CN112130502A
CN112130502A CN202011018414.9A CN202011018414A CN112130502A CN 112130502 A CN112130502 A CN 112130502A CN 202011018414 A CN202011018414 A CN 202011018414A CN 112130502 A CN112130502 A CN 112130502A
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port
axis
data
pins
converter
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闵希华
杨理践
吴锦强
陈勇
贾海东
张贺
刘剑
罗宁
徐春燕
许光达
慕进良
赵康
李坤
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Petrochina Northwest United Pipeline Co Ltd
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Petrochina Northwest United Pipeline Co Ltd
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/24—Pc safety
    • G05B2219/24215—Scada supervisory control and data acquisition

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

The invention relates to a three-axis data acquisition system of a pipeline magnetic flux leakage internal detector, which comprises a calling and processing module, a magnetic flux leakage signal three-axis acquisition submodule and a custom error numerical value filtering processing submodule, wherein the calling and processing module is used for calling and processing a magnetic flux leakage signal three-axis acquisition submodule; the calling and processing module is responsible for calling and processing data of each submodule through the single chip microcomputer; the magnetic flux leakage signal three-axis acquisition submodule is used for acquiring data of three axes of the detector through three groups of sensors; and the custom error numerical value filtering processing submodule is used for filtering the detection data in the three storage areas. The invention can realize the synchronous real-time acquisition of the three-axis magnetic flux leakage signal of the pipeline, and the acquired signal is filtered in real time through the self-designed self-defined error numerical value filtering processing submodule, thereby obtaining more accurate information of the damaged area, greatly enhancing the pipeline damage recognition rate and improving the detection precision.

Description

Three-axis data acquisition system and method for pipeline magnetic flux leakage internal detector
Technical Field
The invention relates to the technical field of pipeline magnetic flux leakage internal detection, in particular to a three-axis data acquisition system and an acquisition method of a pipeline magnetic flux leakage internal detector, which are suitable for being used in the internal detection of a natural gas long-distance pipeline.
Background
The magnetic flux leakage detection technology has the advantages of high reliability, easiness in automation realization, small external interference, no need of a coupling agent and the like, and is widely applied to the field of detection in long-distance pipelines. However, the detection condition in the oil and gas pipeline is complex, the distribution of the pipeline damage magnetic field is uneven, detection signals in a single direction are caused, missing detection and false detection often occur, and the detection precision is greatly influenced.
Disclosure of Invention
The purpose of the invention is as follows:
the invention provides a three-axis data acquisition system and method for a pipeline magnetic flux leakage internal detector, and aims to solve the problem that detection precision is influenced by missing detection or false detection in the existing magnetic flux leakage detection technology.
The technical scheme is as follows:
a three-axis data acquisition system of a pipeline magnetic flux leakage internal detector comprises a calling and processing module, a magnetic flux leakage signal three-axis acquisition submodule and a custom error numerical value filtering processing submodule;
the calling and processing module is responsible for calling and processing data of each submodule through the single chip microcomputer;
the magnetic flux leakage signal three-axis acquisition submodule is used for acquiring data of three axes of the detector through three groups of sensors;
the custom error numerical value filtering processing submodule is used for filtering the detection data in the three storage areas;
the three pins INT0, INT1 and P3.3 of the single chip microcomputer are respectively connected with a control port of the A/D converter, and a data port P0 of the single chip microcomputer is respectively connected with a data port of the A/D converter and a data port of an external parameter memory; the A/D converter is respectively and correspondingly connected with three groups of sensors, and the three groups of sensors are respectively connected with three shafts of the pipeline magnetic flux leakage internal detector.
The P0 port of the A/D converter is connected with the D port of the data access port of the A/D converter, and the A, B, C port of the A/D converter is correspondingly connected with the A0 port, the A1 port and the A2 port of the 74LS373 chip respectively; INT of single-chip microcomputer1Connected with the output end of the second NOT gate, the input end of the second NOT gate is connected with the EOC port of the A/D converter, the WR of the singlechip is connected with the first input end of the first AND gate, and the P of the singlechip is connected with the output end of the second NOT gate2.0The RD of the single chip microcomputer is connected with the second input end of the second AND gate; the output end of the first AND gate is connected with the input end of a third NOT gate, and the output end of the third NOT gate is respectively connected with an ST port and an ALE port of the A/D converter; the output end of the second AND gate is connected with the input end of a fourth NOT gate, and the output end of the fourth NOT gate is connected with an OE port of the A/D converter; the ALE of the singlechip is connected with the CLK port of the A/D converter through a half value circuit; INT of A/D converter0The port is used as a signal access port and is connected with the port A of the sensor.
The sensor adopts a 49E type Hall sensor; the A port of the Hall sensor is connected with the input port of the A/D converter, the B port of the Hall sensor is connected with the power supply, and the C port of the Hall sensor is grounded.
The external parameter memory comprises a 74LS373 chip and an HM628128RAM chip, pins 32, 33, 34, 35, 36, 37, 38 and 39 of the single chip microcomputer are correspondingly connected with pins 18, 17, 14, 13, 8, 7, 4 and 3 of the 74LS373 chip respectively, pins 32, 33, 34, 35, 36, 37, 38 and 39 of the single chip microcomputer are correspondingly connected with pins 21, 20, 19, 18, 17, 15, 14 and 13 of the HM628128RAM chip respectively, pins 19, 16, 15, 12, 9, 6, 5 and 2 of the 74LS373 chip are correspondingly connected with pins 5, 6, 7, 8, 9, 10, 11 and 12 of the HM628128RAM chip respectively, and pins 17 and 18 of the single chip microcomputer are correspondingly connected with pins 24 and 29 of the HM628128RAM chip respectively; pins 1 and 2 of the single chip microcomputer are correspondingly connected with pins 2 and 31 of an HM628128RAM chip respectively, and pins 27, 26, 25, 24, 23, 22 and 21 of the single chip microcomputer are correspondingly connected with pins 3, 28, 4, 25, 23, 26 and 27 of an HM628128RAM chip respectively; the pin 22 of the HM628128RAM chip is connected with a decoding circuit; the 30 feet of the single chip microcomputer are connected with the 11 feet of the 74LS373 chip.
A collecting method of a three-axis data collecting system of a pipeline magnetic flux leakage internal detector comprises the following steps:
1) the calling and processing module is firstly provided with three storage areas which are respectively used for storing the detection data of the X-axis, the Y-axis and the Z-axis;
2) setting the cycle times of detector acquisition through a calling and processing module, calling a leakage magnetic signal three-axis acquisition sub-module, and acquiring three-axis detection data of an X axis, a Y axis and a Z axis; correspondingly storing the acquired triaxial detection data in three storage areas;
3) and the custom error numerical value filtering processing submodule sequentially carries out filtering processing on the detection data in the three storage areas, and the filtered values are stored in the protection areas corresponding to the external parameter storage until the cycle number reaches the set value, so that the data acquisition is completed.
The filtering processing method comprises the following steps:
the detection data in the storage areas are sequentially arranged from small to large, intermediate values in the sequence are selected, the detection data in the same storage area and the intermediate values in the storage area are subtracted one by one to obtain a difference, the difference is compared with an error value set in an error storage unit, if the difference is larger than the error value, the difference is abandoned, and if the difference is smaller than the error value, the difference is stored in a temporary calculation storage area corresponding to the storage area, and a filtered value is obtained.
Has the advantages that:
the invention relates to a method for acquiring triaxial data of a pipeline internal leakage detector, which can realize synchronous real-time acquisition of triaxial leakage magnetic signals of a pipeline, and the acquired signals are filtered in real time through a self-designed self-defined error numerical value filtering processing submodule, so that more accurate information of a damaged area is obtained, the pipeline damage recognition rate is greatly enhanced, and the detection precision is improved.
The method is practical, has simple program quantity and is suitable for being used by multifunctional embedded intelligent equipment such as a single chip microcomputer. The operator can modify the corresponding parameters of the module according to the own engineering detection requirement, so that the method has flexible program use and can adapt to various engineering detection environments.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a system call and process main module;
FIG. 2 is a schematic flow chart of a magnetic flux leakage signal three-axis acquisition submodule;
FIG. 3 is a schematic flow chart of a custom error value filtering processing sub-module;
FIG. 4 is a hardware system connection diagram;
FIG. 5 is a connection diagram of an A/D converter;
FIG. 6 is a schematic diagram of a Hall sensor structure;
FIG. 7 is a diagram of an external memory connection.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. In order to make the technical field of the invention better understand the scheme of the invention, the invention provides an embodiment of a triaxial data acquisition system besides a specific method embodiment.
A three-axis data acquisition system of a pipeline magnetic flux leakage internal detector comprises a calling and processing module, a magnetic flux leakage signal three-axis acquisition submodule and a custom error numerical value filtering processing submodule;
the calling and processing module is responsible for calling and processing data of each submodule through the single chip microcomputer;
the magnetic flux leakage signal three-axis acquisition submodule is used for acquiring data of three axes of the detector through three groups of sensors;
the custom error numerical value filtering processing submodule is used for filtering the detection data in the three storage areas;
as shown in fig. 4, three pins INT0, INT1 and P3.3 of the single chip microcomputer 1 are respectively connected with a control port of the a/D converter 2, and a data port P0 of the single chip microcomputer 1 is respectively connected with a data port of the a/D converter 2 and a data port of the external parameter memory 4; the A/D converter 2 is respectively and correspondingly connected with three groups of sensors 3, and the three groups of sensors 3 are respectively connected with three shafts of the pipeline magnetic flux leakage internal detector;
the three axes of the detector are X axis, Y axis and Z axis, namely three groups of Hall sensors 3 are respectively connected with the X axis, the Y axis and the Z axis. The singlechip 1 is an 80C51 singlechip.
As shown in fig. 5, the a/D converter 2 adopts an AD0809 chip, a P0 port of the a/D converter 2 is connected to a D port of a data access port of the a/D converter 2, and a A, B, C port of the a/D converter 2 is correspondingly connected to a0 port, a1 port and a2 port of a 74LS373 chip, respectively; INT of single-chip microcomputer 11Connected with the output end of a second NOT gate, the input end of the second NOT gate is connected with the EOC port of the A/D converter 2, the WR of the singlechip 1 is connected with the first input end of the first AND gate, and the P of the singlechip 12.0The RD of the single chip microcomputer 1 is connected with the second input end of the second AND gate; the output end of the first AND gate is connected with the input end of a third NOT gate, and the output end of the third NOT gate is respectively connected with an ST port and an ALE port of the A/D converter 2; the output end of the second AND gate is connected with the input end of a fourth NOT gate, and the output end of the fourth NOT gate is connected with an OE port of the A/D converter 2; ALE of the singlechip 1 is connected with CLK of the A/D converter 2 through a half circuitThe ports are connected; INT of A/D converter 20The port is used as a signal access port and is connected with the port A of the sensor 3.
As shown in fig. 6, the sensor 3 is a 49E hall sensor; the A port of the Hall sensor is connected with the input port of the A/D converter, the B port of the Hall sensor is connected with the power supply, and the C port of the Hall sensor is grounded.
As shown in fig. 7, the external parameter memory 4 includes a 74LS373 chip and an HM628128RAM chip, pins 32, 33, 34, 35, 36, 37, 38, and 39 of the single chip microcomputer 1 are respectively connected to pins 18, 17, 14, 13, 8, 7, 4, and 3 of the 74LS373 chip, pins 32, 33, 34, 35, 36, 37, 38, and 39 of the single chip microcomputer 1 are respectively connected to pins 21, 20, 19, 18, 17, 15, 14, and 13 of the HM628128RAM chip, pins 19, 16, 15, 12, 9, 6, 5, and 2 of the 74LS373 chip are respectively connected to pins 5, 6, 7, 8, 9, 10, 11, and 12 of the HM628128RAM chip, and pins 17 and 18 of the single chip microcomputer 1 are respectively connected to pins 24 and 29 of the HM628128RAM chip; pins 1 and 2 of the singlechip 1 are correspondingly connected with pins 2 and 31 of an HM628128RAM chip respectively, and pins 27, 26, 25, 24, 23, 22 and 21 of the singlechip 1 are correspondingly connected with pins 3, 28, 4, 25, 23, 26 and 27 of an HM628128RAM chip respectively; the pin 22 of the HM628128RAM chip is connected with a decoding circuit; the pin 30 of the singlechip 1 is connected with the pin 11 of the 74LS373 chip.
The system comprises a calling and processing module, a magnetic flux leakage signal three-axis acquisition submodule and a custom error numerical value filtering processing submodule, wherein the calling and processing module is responsible for calling and processing data of each submodule through a single chip microcomputer 1; the magnetic flux leakage signal three-axis acquisition submodule is used for acquiring data of three axes of the detector through the three groups of sensors 3; and the custom error numerical value filtering processing submodule is used for filtering the detection data in the three storage areas.
A collecting method of a three-axis data collecting system of a pipeline magnetic flux leakage internal detector comprises the following steps:
1) the calling and processing module firstly sets three storage areas of ADTURN0, ADTURN1 and ADTURN2, and the three storage areas of ADTURN0, ADTURN1 and ADTURN2 are respectively used for storing detection data of three axes of an X axis, a Y axis and a Z axis;
2) setting the cycle times of detector acquisition through a calling and processing module, calling a leakage magnetic signal three-axis acquisition sub-module, and acquiring three-axis detection data of an X axis, a Y axis and a Z axis; correspondingly storing the acquired triaxial detection data in three storage areas, namely ADTURN0, ADTURN1 and ADTURN 2;
3) and the filtering processing submodule sequentially filters the detection data in the three storage areas of ADTURN0, ADTURN1 and ADTURN2, and the filtered values are stored in a protection area corresponding to an external parameter storage until the cycle number reaches a set value, so that the data acquisition is completed.
Specifically, a pointer R0 points to an ADTURN0 storage area, a filtering processing submodule is called to perform software filtering on X-axis data, a filtered value is stored in an X-axis data storage area of an external parameter memory 4, a pointer R1 points to an ADTURN1 storage area, a filtering processing submodule is called to perform software filtering on Y-axis data, the filtered value is stored in an Y-axis data storage area of the external parameter memory, a pointer R2 points to an ADTURN2 storage area, a filtering processing submodule is called to perform software filtering on Z-axis data, and the filtered value is stored in a Z-axis data storage area of the external parameter memory; and judging whether the cycle number reaches the preset value of the acquisition cycle, if not, performing cycle detection again, and if so, jumping out of the module and waiting for further analysis and processing of the signal.
The filtering processing method comprises the following steps: the filtering processing method of the three storage areas is the same, and specifically comprises the following steps:
the detection data in the storage areas are sequentially arranged from small to large, intermediate values in the sequence are selected, the detection data in the same storage area and the intermediate values in the storage area are subtracted one by one to obtain a difference, the difference is compared with an error value set in an error storage unit, if the difference is larger than the error value, the difference is abandoned, and if the difference is smaller than the error value, the difference is stored in a temporary calculation storage area corresponding to the storage area, and a filtered value is obtained.
The method can realize synchronous real-time acquisition of the three-axis magnetic flux leakage signals of the pipeline, and the acquired signals are filtered in real time through the self-designed self-defined error numerical value filtering processing submodule, so that more accurate damage area information is obtained, the pipeline damage identification rate is greatly enhanced, and the detection precision is improved. The problem that the detection precision is influenced by missing detection or false detection in the existing magnetic flux leakage detection technology is solved.
Example 1
As shown in fig. 1, the invention includes a system call and processing main module, a leakage magnetic signal three-axis acquisition sub-module, and a custom error value filtering processing sub-module. The system calling and processing main module firstly sets ADTURN0, ADTURN1 and ADTURN2, and the storage areas are used for storing detection data of three axes of an X axis, a Y axis and a Z axis respectively; setting the acquisition cycle number of the detector; calling a magnetic flux leakage signal three-axis acquisition submodule and acquiring three-axis detection data; the pointer R0 points to an ADTURN0 storage area, a user-defined error numerical value filtering processing submodule is called to perform software filtering on X-axis data, a filtered value is stored in an X-axis data storage area of an external memory, the pointer R1 points to the ADTURN1 storage area, the user-defined error numerical value filtering processing submodule is called to perform software filtering on Y-axis data, the filtered value is stored in a Y-axis data storage area of the external memory, the pointer R2 points to an ADTURN2 storage area, the user-defined error numerical value filtering processing submodule is called to perform software filtering on Z-axis data, and the filtered value is stored in a Z-axis data storage area of the external memory; and judging whether the cycle number reaches the collection cycle preset value or not, if not, carrying out cycle detection again, and if so, jumping out of the system calling and processing main module to wait for further analysis and processing of the signal.
As shown in fig. 2, the leakage magnetic signal three-axis collecting sub-module firstly points three data pointers R0, R1 and R2 to ADTURN0, ADTURN1 and ADTURN2, and the three storage areas store three storage area first addresses; setting the number of the once detection internal circulation to be 31; starting an IN0 channel to collect X-axis detection data, performing A/D conversion, putting the converted data into an R0 pointing area, and pointing R0 to the next storage unit; starting an IN1 channel to acquire Y-axis detection data, performing A/D conversion, putting the converted data into an R1 pointing area, and pointing R1 to the next storage unit; starting P3.3 channels to collect Z-axis detection data, performing A/D conversion, putting the converted data into an R2 pointing area, and pointing R2 to the next storage unit; and judging whether the internal circulation frequency reaches 31, detecting the internal circulation again if the internal circulation frequency does not reach 31, jumping out of the leakage magnetic signal three-axis acquisition submodule if the internal circulation frequency reaches 31, and waiting for system calling and main processing module calling.
As shown in fig. 3, the custom error value filtering processing submodule has the following working steps: (1) pointing an R1 pointer to a temporary calculation storage area first address ADTURN2, clearing an R2 register to be used as an average summation counter, and clearing an R3 register to be used as a large circulation counter; (2) the specific method for arranging the data collected by the ADTURN1 storage area from large to small is as follows: storing the R0 pointing value into a register 3CH, pointing R0 to the next storage unit, comparing the median value of the register 3CH with the R0 pointing value, if the R0 pointing value is large, interchanging the median value of the register 3CH with the R0 pointing value, then pointing R0 to the next storage unit to continue circulation, if the median value of the register 3CH is large, directly pointing R0 to the next storage unit to continue circulation, and thus 31 times of circulation can arrange the values in the acquisition data storage area with the ADTURN1 as the first address in the order from small to large; (3) taking the middle value of the ADTURN1 storage area, subtracting the value of the ADTURN1 storage area from the middle value one by one, comparing the subtracted value with the value of an error storage unit LINEADR2, abandoning if the subtracted value is larger than the middle value, and storing the subtracted value in a temporary calculation storage area with the ADTURN2 as the initial address, wherein the method comprises the steps of pointing an R0 pointer to the 16 th value of a collected data storage area, namely the middle value, putting the value in a 3CH register, pointing an R0 pointer to the initial address ADTURN1 of the collected data storage area, putting the subtracted result of the R0 pointer and the 3CH register value in a 2F register, removing the sign of the 2F register value to obtain the absolute value, pointing an R0 pointer to the next storage unit, adding a counter to the R3, comparing the 2F register value with the value of the error storage unit LINEADTURN 2, comparing the value if the subtracted value is larger than the sign of the absolute value, and judging that the value is not larger than the absolute value, adding a counter to the R2, after the value is put into an R1 pointing area, R1 points to the next storage unit, the R3 count is used for controlling the large circulation to be 31 times, thus, a group of values meeting the conditions are put into a temporary calculation storage area with the ADTURN2 as the first address after 31 times of circulation, and the number of the values is put into an R2 counter; (4) averaging the values of the temporary calculation storage area with the ADTURN2 as the first address, namely storing the filtering data into a LINEADR0 storage unit, wherein the specific method comprises the following steps: the 3CH register is cleared, the R1 pointer points to the head address ADTURN2 of the temporary calculation storage area, the R1 pointing value and the 3CH register value are added and stored in the 3CH register, thus after multiple cycles (cycle times are extracted from the R2 register), the value of the temporary calculation storage area with the ADTURN2 as the head address is averaged and put into the 3CH register, namely the filtered value, and the 3CH register value is stored in the corresponding external storage area in the system calling and processing main module.

Claims (6)

1. The utility model provides a detector triaxial data acquisition system in pipeline magnetic leakage which characterized in that: the system comprises a calling and processing module, a magnetic flux leakage signal three-axis acquisition submodule and a custom error numerical value filtering processing submodule;
the calling and processing module is responsible for calling and processing data of each submodule through the singlechip (1);
the magnetic flux leakage signal three-axis acquisition submodule is used for acquiring data of three axes of the detector through three groups of sensors (3);
the custom error numerical value filtering processing submodule is used for filtering the detection data in the three storage areas;
INT0, INT1 and P3.3 pins of the single chip microcomputer (1) are respectively connected with a control port of the A/D converter (2), and a data port P0 of the single chip microcomputer (1) is respectively connected with a data port of the A/D converter (2) and a data port of the external parameter memory (4); the A/D converter (2) is respectively and correspondingly connected with three groups of sensors (3), and the three groups of sensors (3) are respectively connected with three shafts of the pipeline magnetic leakage inner detector.
2. The three-axis data acquisition system for the detector in the flux leakage of the pipeline according to claim 1, wherein: the P0 port of the A/D converter (2) is connected with the D port of the data access port of the A/D converter (2), and the A, B, C port of the A/D converter (2) is correspondingly connected with the A0 port, the A1 port and the A2 port of the 74LS373 chip respectively; INT of single-chip microcomputer (1)1Is connected with the output end of a second NOT gate, the input end of the second NOT gate is connected with an EOC port of the A/D converter (2), WR of the singlechip (1) is connected with the first input end of the first AND gate, and P of the singlechip (1)2.0The RD of the single chip microcomputer (1) is connected with the second input end of the second AND gate; the output end of the first AND gate is connected with the input end of a third NOT gate, and the output end of the third NOT gate is respectively connected with an ST port and an ALE port of the A/D converter (2); the output end of the second AND gate is connected with the input end of a fourth NOT gate, and the output end of the fourth NOT gate is connected with an OE port of the A/D converter (2); the ALE of the single chip microcomputer (1) is connected with the CLK port of the A/D converter (2) through a half-value circuit; INT of A/D converter (2)0The port is used as a signal access port and is connected with the port A of the sensor (3).
3. The three-axis data acquisition system for the detector in the flux leakage of the pipeline according to claim 1, wherein: the sensor (3) adopts a 49E type Hall sensor; the A port of the Hall sensor is connected with the input port of the A/D converter, the B port of the Hall sensor is connected with the power supply, and the C port of the Hall sensor is grounded.
4. The three-axis data acquisition system for the detector in the flux leakage of the pipeline according to claim 1, wherein: the external parameter memory (4) comprises a 74LS373 chip and an HM628128RAM chip, pins 32, 33, 34, 35, 36, 37, 38 and 39 of the single chip microcomputer (1) are correspondingly connected with pins 18, 17, 14, 13, 8, 7, 4 and 3 of the 74LS373 chip respectively, pins 32, 33, 34, 35, 36, 37, 38 and 39 of the single chip microcomputer (1) are correspondingly connected with pins 21, 20, 19, 18, 17, 15, 14 and 13 of the HM628128RAM chip respectively, pins 19, 16, 15, 12, 9, 6, 5 and 2 of the 74LS373 chip are correspondingly connected with pins 5, 6, 7, 8, 9, 10, 11 and 12 of the HM628128RAM chip respectively, and pins 17 and 18 of the single chip microcomputer (1) are correspondingly connected with pins 24 and 29 of the HM628128RAM chip respectively; pins 1 and 2 of the singlechip (1) are correspondingly connected with pins 2 and 31 of an HM628128RAM chip respectively, and pins 27, 26, 25, 24, 23, 22 and 21 of the singlechip (1) are correspondingly connected with pins 3, 28, 4, 25, 23, 26 and 27 of an HM628128RAM chip respectively; the pin 22 of the HM628128RAM chip is connected with a decoding circuit; the pin 30 of the singlechip (1) is connected with the pin 11 of the 74LS373 chip.
5. The acquisition method of the triaxial data acquisition system of the detector in the flux leakage of the pipeline according to claim 1, wherein: the method comprises the following steps:
1) the calling and processing module is firstly provided with three storage areas which are respectively used for storing the detection data of the X-axis, the Y-axis and the Z-axis;
2) setting the cycle times of detector acquisition through a calling and processing module, calling a leakage magnetic signal three-axis acquisition sub-module, and acquiring three-axis detection data of an X axis, a Y axis and a Z axis; correspondingly storing the acquired triaxial detection data in three storage areas;
3) and the custom error numerical value filtering processing submodule sequentially carries out filtering processing on the detection data in the three storage areas, and the filtered values are stored in the protection areas corresponding to the external parameter storage until the cycle number reaches the set value, so that the data acquisition is completed.
6. The acquisition method of the triaxial data acquisition system of the pipeline internal leakage detector according to claim 5, wherein: the filtering processing method comprises the following steps:
the detection data in the storage areas are sequentially arranged from small to large, intermediate values in the sequence are selected, the detection data in the same storage area and the intermediate values in the storage area are subtracted one by one to obtain a difference, the difference is compared with an error value set in an error storage unit, if the difference is larger than the error value, the difference is abandoned, and if the difference is smaller than the error value, the difference is stored in a temporary calculation storage area corresponding to the storage area, and a filtered value is obtained.
CN202011018414.9A 2020-09-24 2020-09-24 Three-axis data acquisition system and method for pipeline magnetic flux leakage internal detector Pending CN112130502A (en)

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Application publication date: 20201225