CN103940833B - A kind of detection method of polyethylene pipe welding joint defect - Google Patents
A kind of detection method of polyethylene pipe welding joint defect Download PDFInfo
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Abstract
The present invention relates to the detection field of pressure pipeline, specifically a kind of detection method of the polyethylene pipe welding joint defect based on microwave reflection electrical bridge principle and pick-up unit.Microwave detecting device comprises: microwave signal source, isolator, attenuator, phase shifter, microwave bridge, wave detector, alarm, display, pyramidal horn antenna, concentric cable and power supply etc.During detection, the two-arm of electric bridge connects reference sample and testing sample respectively by pyramid loudspeaker, enter wave detector after being subtracted from one another by the microwave signal that they reflect, compare with signal reference value after amplifying, detect the defect in welding joint with this.The present invention has the advantages such as detection sensitivity is high, accuracy is good, effectively can detect various manufacturability and non-process defect, and be applicable to Site Detection.Particularly, can effectively detect cold welding defect, easy and simple to handle, cost is lower.
Description
Technical field
The present invention relates to the detection field of pressure pipeline, specifically a kind of detection method of the polyethylene pipe welding joint defect based on microwave reflection electrical bridge principle and pick-up unit.
Background technology
Tygon (polyethylene, PE) pipeline is widely used in the transmission of the danger medium such as combustion gas, it has a lot of remarkable performances, as: low temperature resistant, corrosion-resistant, good toughness, cracking resistance, easy to connect, anti-scratch ability and opposing crack propagation ability are good, long service life.Connection between polyvinyl piping materials is the important step affecting its structural intergrity and creep rupture strength, therefore the trouble free service of polyvinyl fuel gas pipeline system and its joint quality closely bound up.Method of attachment between polyethylene pipe mainly contains sweat soldering and electric fusion welding two kinds, no matter be sweat soldering or electric fusion welding, all can because of subjective or objective factor in actual mechanical process, make polyethylene pipe welding joint place may produce various different defect, mainly comprise crackle, pore, be mingled with, cold welding etc.Wherein, be the most difficult to the detection of the manufacturability defect as cold welding, because this defect does not generally show as the change of joint macrostructure, but the quality and performance of butt junction can have a huge impact.The security of defect to polyethylene pipe of joint is very large threat, and most polyethylene pipe accident is all caused by joint defect.Therefore, the security of polyethylene pipe be improved, joint defect inspection method and relevant device effectively reliably must be provided.
The detection method of existing polyethylene pipe welding joint mainly contains destructive test and nondestructive test two class.The destructive test of joint is the evaluation to welding bonding interface ability in essence, and present stage is used for greatly the product development of welding machine producer, and nondestructive test mainly refers to visual detection and Ultrasonic Detection.Visual detection does not form country or industry standard, and detection method is mainly formed according to engineering experience, and reliability is low.Ultrasonic Detection directly can obtain the status information of material internal, can differentiate some gross imperfections, but tygon is a kind of macromolecular material, compare metal material and can absorb the more acoustic wave energy with loss, and because its structural rate metal material is complicated, be easy to the scattering increasing sound wave, these all considerably increase the difficulty of polyethylene pipe joint Ultrasonic Detection.The more important thing is, the detection of ultrasonic method to the cold welding defect of polyethylene pipe joint is very difficult.
Chinese invention patent (patent No. 201110266710.5), disclose a kind of Microwave Scanning detection method and pick-up unit of polyethylene pipe hot melt joint, polyethylene pipe hot melt joint is detected with Microwave Scanning device, transmitter in microwave probe is to tested joint launched microwave, microwave is through two receiving sensor record baseline wave amplitudes, and then penetration joints surface enters its inside.When the microwave in advancing runs into defect time, the change of specific inductive capacity makes microwave reflect; Interfered by the microwave signal of the microwave signal that reflects and transmitting, received by receiving sensor and convert voltage signal to, input after signal translating system in computing machine together with scanning position information, obtain scan image, obtain the relevant information of defect in hot melting connector according to scan image.Its weak point is, needs to obtain scan image by the sequential operation of complexity during detection, requires high to the software merit rating of equipment.Further, obtain scan image clearly, need very high microwave frequency, these all substantially increase manufacture difficulty and the cost of equipment.
Summary of the invention
The object of the invention is the deficiency overcoming above-mentioned background technology, a kind of detection method and pick-up unit of the polyethylene pipe welding joint based on microwave reflection electrical bridge principle are provided.This detection method and pick-up unit have advantages such as can detecting polytype defect, detection sensitivity and precision are high, good reliability, and particularly effectively can detect cold welding defect, easy and simple to handle, cost is lower.
Technical scheme of the present invention is:
A kind of detection method of polyethylene pipe welding joint defect, when detecting polyethylene pipe welding joint with the pick-up unit based on microwave reflection electrical bridge principle, microwave signal source by pyramidal horn antenna to tested joint launched microwave, microwave penetration joint surface enters its inside, when the microwave in advancing runs into defect, the change of specific inductive capacity makes microwave reflect at fault location; The reference signal that the microwave signal reflected enters electric bridge and standard termination zero defect sample compares, result is relatively after detection and signal are amplified, obtained the data that can be used for judging whether existing defects and defect type by display, and pointed out the existence of defect by alarm sound and light alarm.
The detection method of described polyethylene pipe welding joint defect, realizes according to the following steps:
(1) pyramidal horn antenna is placed in polyethylene pipe welding joint outside surface, at a distance of 0-10cm, slowly move forward into line scanning, translational speed is 0.1-10cm/ second; Simultaneously microwave signal source is the microwave of 2-50GHz by pyramidal horn antenna to welding joint transmission frequency;
(2) microwave signal reflected from welding joint enters pyramidal horn antenna, via the co-axial cables transport be attached thereto to microwave bridge, compares with the reference signal of standard termination zero defect sample;
(3) result compared, after detection and signal amplify, obtains the data that can be used for judging whether existing defects and defect type by display, and audible-visual annunciator can glimmer warning in case of a defect.
The detection method of described polyethylene pipe welding joint defect, during detection, pyramidal horn antenna is in the outside surface slowly movement of polyethylene pipe welding joint, and the microwave antenna be attached thereto moves at the opposite side of welding joint thereupon, to receive the transmitted wave signal through welding joint.
The detection method of described polyethylene pipe welding joint defect, when detecting polyethylene pipe welding joint, avoids using couplant.
The detection method of described polyethylene pipe welding joint defect, pyramidal horn antenna and welding joint outside surface carry out contact detection; Or, adopt pyramidal horn antenna to detect near the mode of welding joint outside surface.
1. and 2. the detection method of described polyethylene pipe welding joint defect, in microwave bridge, when 4. signal inputs from H arm, in phase enters two other arms, and can not directly enter E arm 3. by decile; When 1. and 2. two-arm external load impedance is equal and also positional symmetry time, 3. the reflection wave of two loads enters E arm by with equal size and contrary phase place, and can not enter H arm 4.; If at E arm 3. external coupling wave detector, then this wave detector be designated as zero, represent electric bridge reach balance, 1. and 2. the impedance of two-arm external load is equal; If two loaded impedances are unequal, E arm 3. just have export and non-vanishing, namely electric bridge is unbalance; In unbalanced bridge, if an arm connect is matched load, then electric bridge unbalance degree just represent another arm connect the not matching degree of load, so unbalanced bridge is in order to the microwave parameters of sensing lead;
During detection, the two-arm of microwave bridge connects reference sample and testing sample respectively by pyramidal horn antenna, enter wave detector after being subtracted from one another by the microwave signal that they reflect, compare with signal reference value after amplifier amplifies, detect the defect in welding joint with this.
The pick-up unit of the polyethylene pipe welding joint defect that described method uses, this pick-up unit comprises: microwave signal source, isolator, attenuator, phase shifter, microwave bridge, wave detector, alarm, display, pyramidal horn antenna, concentric cable and power supply, the output terminal of microwave signal source connects isolator, isolator is high resistant to signal prime, the output terminal of isolator connects the input end of microwave bridge, microwave bridge connects reference sample and testing sample respectively by pyramidal horn antenna, the circuit that microwave bridge is connected with standard model arranges phase shifter and attenuator, microwave bridge is connected with pyramidal horn antenna by concentric cable, the output terminal tie geophone of microwave bridge, the output terminal of wave detector connects amplifier, and the output terminal of amplifier connects display and alarm.
The pick-up unit of described polyethylene pipe welding joint defect, welding joint is hot melting connector or electric fusion joint.
The pick-up unit of described polyethylene pipe welding joint defect, this pick-up unit also comprises control circuit, control circuit is provided with power module, microprogram control unit, reseting module, display module, signal processing module, crystal oscillator module, ISP download module, alarm module, and concrete annexation is as follows:
Two external crystal pins XTAL1 input ends of microprogram control unit are connected with crystal oscillator module two pin X1 with X2 respectively with XTAL2 output terminal; Four pins PB5, PB6, PB7, RESET of microprogram control unit, be connected with four pins MOSI, MISO, SCK, RESET of ISP download module respectively; The PA0 end of signal processing module is connected with the pin PA0 of microprogram control unit, and the output terminal of microprogram control unit is connected with the input end of display module with the Buzzer input end of alarm module respectively;
The output terminal of reseting module is connected with the RESET reset input pin of microprogram control unit, and the positive source of power module connects with microprogram control unit, reseting module, display module, alarm module, ISP download module, signal processing module respectively;
Simulating signal to be amplified from wave detector signal out by signal processing module and A/D is converted into digital signal, after microprogram control unit process, result shown by display module, if detected sample defectiveness, alarm module is by alarm.
Principle of the present invention is as follows:
Microwave is the electromagnetic wave of a kind of frequency range between 0.3-300GHz.When microwave from a kind of medium enter into another kind there is the medium of differing dielectric constant time, the difference of two media specific inductive capacity makes the parameter of microwave change.Defect in material can be regarded as the medium with the specific inductive capacity different from adjacent material, and when the microwave in advancing runs into defect time, the change of specific inductive capacity makes microwave reflect at fault location.The microwave signal reflected, after detection and signal amplify, is compared by the reference signal of electric bridge and standard termination (zero defect sample), and the data obtained can be used for judging whether the type of existing defects and defect.
Compared with prior art, advantage of the present invention and beneficial effect are:
Detection method provided by the invention and pick-up unit can detect polytype defect of polyethylene pipe welding joint effectively, and concrete advantage is as follows:
(1) compared with the lossless detection methods such as ultrasonic, the ray of routine, detection method of the present invention and pick-up unit do not need couplant when detecting, and can realize the quick detection of not surface in contact, detection efficiency is high, be conducive to shortening detection time, reduce testing cost;
(2) microwave detecting device of the present invention comprises: microwave signal source, isolator, attenuator, phase shifter, microwave bridge, wave detector, alarm, display, pyramidal horn antenna, concentric cable and power supply etc., and it is easy and simple to handle, and cost is lower;
(3) the present invention is based on the principle of microwave reflection and electric bridge reference, effectively can detect the manufacturability defect in welding joint and non-process defect, especially can effectively detect cold welding defect, this is that other lossless detection method is difficult to realize;
(4) detection method of the present invention and pick-up unit are applicable to the detection to various dielectric material, as plastics, rubber, pottery, fiberglass etc.Have not yet to see the report about microwave reflection bridge technology detects polyethylene pipe welding joint both at home and abroad, therefore enforcement of the present invention is expected to fill up the domestic blank in this field;
(5) detection method and pick-up unit can be used for Site Detection.
Accompanying drawing explanation
Fig. 1 is the theory diagram of microwave detecting device provided by the invention.
Fig. 2 is the control circuit figure of microwave detecting device provided by the invention.
Fig. 3 is the bridge method principle schematic of microwave detecting device provided by the invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, set forth the present invention further.
As shown in Figure 1, the present invention is based on the pick-up unit of the polyethylene pipe welding joint of microwave reflection electrical bridge principle, comprise: microwave signal source, isolator, attenuator, phase shifter, microwave bridge, wave detector, alarm, display, pyramidal horn antenna, concentric cable and power supply etc., its concrete structure is as follows:
The output terminal of microwave signal source connects isolator, and isolator is high resistant to signal prime, is low-resistance to signal rear class, can isolate front stage impedance and influence each other, reach impedance matching, improves the linearity of signal.The output terminal of isolator connects the input end of microwave bridge, microwave bridge connects reference sample and testing sample respectively by pyramidal horn antenna, the circuit that microwave bridge is connected with standard model arranges phase shifter and attenuator, and microwave bridge is connected with pyramidal horn antenna by concentric cable.The output terminal tie geophone of microwave bridge, the output terminal of wave detector connects amplifier, and the output terminal of amplifier connects display and alarm.
During detection, the two-arm of microwave bridge connects reference sample and testing sample respectively by pyramidal horn antenna, enter wave detector after being subtracted from one another by the microwave signal that they reflect, compare with signal reference value after amplifier amplifies, detect the defect in welding joint with this.The present invention has the advantages such as detection sensitivity is high, accuracy is good, effectively can detect various manufacturability and non-process defect, and be applicable to Site Detection.
As shown in Figure 2, the control circuit of microwave detecting device provided by the invention mainly comprises power module, microprogram control unit (32 Mega16 single-chip microcomputers), reseting module, display module, signal processing module (AD620AR amplifier), crystal oscillator module, ISP download module, alarm module etc., and concrete structure is as follows:
Two external crystal pins XTAL1 (input end) of microprogram control unit are connected with crystal oscillator module two pin X1 with X2 respectively with XTAL2 (output terminal).Four pin PB5 (MOSI) of microprogram control unit, PB6 (MISO), PB7 (SCK), RESET are connected with four pins MOSI, MISO, SCK, RESET of ISP download module respectively.The PA0 end of signal processing module is connected with the pin PA0 of microprogram control unit, and the output terminal of microprogram control unit is connected with the input end of display module with the Buzzer input end of alarm module respectively.
The output terminal of reseting module is connected with the RESET reset input pin of microprogram control unit, and the positive source of power module connects with microprogram control unit, reseting module, display module, alarm module, ISP download module, signal processing module respectively.Wherein, display module is provided with LCD liquid crystal display.
The course of work and the principle of the control circuit of microwave detecting device provided by the invention are as follows:
Simulating signal to be amplified from wave detector signal out by signal processing module and A/D is converted into digital signal, after selective laser sintering chip (microprogram control unit) process, result is shown by display module, if detected sample defectiveness, alarm module is by alarm.Power module provides AC and DC two kinds of powering modes; Crystal oscillator module is used for the frequency of operation of stabilizing equipment; ISP download module is used for the program loading equipment write outside; Reseting module is used for the reset of equipment.
As shown in Figure 3, in the core of pick-up unit of the present invention---1. and 2. in microwave bridge, when 4. signal inputs from H arm, decile is in phase entered two other arms, and can not directly enter E arm 3.; When 1. and 2. two-arm external load impedance is equal and also positional symmetry time, 3. the reflection wave of two loads enters E arm by with equal size and contrary phase place, and can not enter H arm 4..If at E arm 3. external coupling wave detector, then this wave detector be designated as zero, represent electric bridge reach balance, 1. and 2. the impedance of two-arm external load is equal.If two loaded impedances are unequal, E arm 3. just have export and non-vanishing, namely electric bridge is unbalance.In unbalanced bridge, if an arm connect is matched load, then electric bridge unbalance degree just represent another arm connect the not matching degree of load, so unbalanced bridge can in order to microwave parameters such as the standing-wave ratio of sensing lead, reflection coefficients.
The present invention is based on the detection method of the polyethylene pipe welding joint of microwave reflection electrical bridge principle, realize according to the following steps:
(1) pyramidal horn antenna is placed in polyethylene pipe welding joint outside surface, at a distance of 0-10cm slowly movement, translational speed is 0.1-10cm/ second; Simultaneously microwave signal source is the microwave of 2-50GHz by pyramidal horn antenna to welding joint transmission frequency;
(2) microwave signal reflected from welding joint enters pyramidal horn antenna, via the co-axial cables transport be attached thereto to microwave bridge, compares with the reference signal of standard termination (zero defect sample);
(3) result compared, after detection and signal amplify, is obtained by display and can be used for the data of the type judging whether existing defects and defect, and audible-visual annunciator can glimmer warning in case of a defect.
Embodiment 1
Microwave detecting device provided by the invention is used to detect the polyethylene pipe hot melt joint that contains gas hole defect.First butt junction outside surface carries out simple process, makes it smooth, then detects according to the step butt junction in technical scheme provided by the invention.Pyramidal horn antenna is placed in this hot melting connector outside surface, distance between pyramidal horn antenna and joint outside surface is 2cm, with the slow mobile pyramidal horn antenna of speed of 1cm/ second, transmission frequency is the microwave of 15GHz, the microwave signal reflected from joint enters pyramidal horn antenna, via the co-axial cables transport be attached thereto to microwave bridge, compare with the reference signal of standard termination.Result is relatively after detection and signal are amplified, and display display correlation parameter numerical value or curve, can judge to there is gas hole defect in this joint, and audible-visual annunciator flicker is simultaneously reported to the police.
Embodiment 2
Microwave detecting device provided by the invention is used to detect the polyethylene pipe electric fusion joint that contains inclusion defect.First butt junction outside surface carries out simple process, make it smooth, then detect according to the step butt junction in technical scheme provided by the invention, pyramidal horn antenna is placed in this thermoelectricity welded joint outside surface, distance between pyramidal horn antenna and joint outside surface is 1cm, with the slow mobile microwave probe of speed of 5cm/ second, transmission frequency is the microwave of 9GHz, the microwave signal reflected from joint enters pyramidal horn antenna, via the co-axial cables transport be attached thereto to microwave bridge, compare with the reference signal of standard termination.Result is relatively after detection and signal are amplified, and display display correlation parameter numerical value or curve, can judge to there is inclusion defect in this joint, and audible-visual annunciator flicker is simultaneously reported to the police.
Embodiment 3
Microwave detecting device provided by the invention is used to detect the polyethylene pipe electric fusion joint that contains cold welding defect.First butt junction outside surface carries out simple process, make it smooth, then detect according to the step butt junction in technical scheme provided by the invention, pyramidal horn antenna is placed in this electric fusion joint outside surface, distance between pyramidal horn antenna and joint outside surface is 5cm, with the slow mobile microwave probe of speed of 0.5cm/ second, transmission frequency is the microwave of 18GHz, the microwave signal reflected from joint enters pyramidal horn antenna, via the co-axial cables transport be attached thereto to microwave bridge, compare with the reference signal of standard termination.Result is relatively after detection and signal are amplified, and display display correlation parameter numerical value or curve, can judge to there is cold welding gas hole defect in this joint, and audible-visual annunciator flicker is simultaneously reported to the police.
Embodiment 4
Microwave detecting device provided by the invention is used to detect the polyethylene pipe hot melt joint that contains crack defect.First butt junction outside surface carries out simple process, make it smooth, then detect according to the step butt junction in technical scheme provided by the invention, pyramidal horn antenna is placed in the side of this hot melting connector outside surface, distance between pyramidal horn antenna and joint outside surface is 7cm, with the slow mobile microwave probe of speed of 2cm/ second, transmission frequency is the microwave of 10GHz, the microwave signal reflected from joint enters pyramidal horn antenna, via the co-axial cables transport be attached thereto to microwave bridge, compare with the reference signal of standard termination.Result is relatively after detection and signal are amplified, and display display correlation parameter numerical value or curve, can judge to there is crack defect in this joint, and audible-visual annunciator flicker is simultaneously reported to the police.
Embodiment result shows, detection method based on this pick-up unit can detect polytype defect, has detection sensitivity and the advantage such as precision is high, good reliability, effectively can detect polytype defect, especially can detect cold welding defect, and can be used for Site Detection.
Should be understood that these embodiments are only for illustration of the present invention, and be not used in and limit the scope of the invention.In addition should be understood that those skilled in the art make various changes or modifications the present invention, these equivalent form of values fall within this limited range of the present invention equally.
Claims (7)
1. the detection method of a polyethylene pipe welding joint defect, it is characterized in that, when detecting polyethylene pipe welding joint with the pick-up unit based on microwave reflection electrical bridge principle, microwave signal source by pyramidal horn antenna to tested joint launched microwave, microwave penetration joint surface enters its inside, when the microwave in advancing runs into defect, the change of specific inductive capacity makes microwave reflect at fault location; The reference signal that the microwave signal reflected enters electric bridge and standard termination zero defect sample compares, result is relatively after detection and signal are amplified, obtained the data that can be used for judging whether existing defects and defect type by display, and pointed out the existence of defect by alarm sound and light alarm;
The pick-up unit of the polyethylene pipe welding joint defect that described method uses, this pick-up unit comprises: microwave signal source, isolator, attenuator, phase shifter, microwave bridge, wave detector, alarm, display, pyramidal horn antenna, concentric cable and power supply, the output terminal of microwave signal source connects isolator, isolator is high resistant to signal prime, the output terminal of isolator connects the input end of microwave bridge, microwave bridge connects reference sample and testing sample respectively by pyramidal horn antenna, the circuit that microwave bridge is connected with standard model arranges phase shifter and attenuator, microwave bridge is connected with pyramidal horn antenna by concentric cable, the output terminal tie geophone of microwave bridge, the output terminal of wave detector connects amplifier, and the output terminal of amplifier connects display and alarm,
This pick-up unit also comprises control circuit, and control circuit is provided with power module, microprogram control unit, reseting module, display module, signal processing module, crystal oscillator module, ISP download module, alarm module, and concrete annexation is as follows:
Two external crystal pins XTAL1 input ends of microprogram control unit are connected with crystal oscillator module two pin X1 with X2 respectively with XTAL2 output terminal; Four pins PB5, PB6, PB7, RESET of microprogram control unit, be connected with four pins MOSI, MISO, SCK, RESET of ISP download module respectively; The PA0 end of signal processing module is connected with the pin PA0 of microprogram control unit, and the output terminal of microprogram control unit is connected with the input end of display module with the Buzzer input end of alarm module respectively;
The output terminal of reseting module is connected with the RESET reset input pin of microprogram control unit, and the positive source of power module connects with microprogram control unit, reseting module, display module, alarm module, ISP download module, signal processing module respectively;
Simulating signal to be amplified from wave detector signal out by signal processing module and A/D is converted into digital signal, after microprogram control unit process, result shown by display module, if detected sample defectiveness, alarm module is by alarm.
2. according to the detection method of polyethylene pipe welding joint defect according to claim 1, it is characterized in that, realize according to the following steps:
(1) pyramidal horn antenna is placed in polyethylene pipe welding joint outside surface, at a distance of 0-10cm, slowly move forward into line scanning, translational speed is 0.1-10cm/ second; Simultaneously microwave signal source is the microwave of 2-50GHz by pyramidal horn antenna to welding joint transmission frequency;
(2) microwave signal reflected from welding joint enters pyramidal horn antenna, via the co-axial cables transport be attached thereto to microwave bridge, compares with the reference signal of standard termination zero defect sample;
(3) result compared, after detection and signal amplify, obtains the data that can be used for judging whether existing defects and defect type by display, and audible-visual annunciator can glimmer warning in case of a defect.
3. according to the detection method of polyethylene pipe welding joint defect according to claim 1, it is characterized in that, during detection, pyramidal horn antenna is in the outside surface slowly movement of polyethylene pipe welding joint, the microwave antenna be attached thereto moves at the opposite side of welding joint thereupon, to receive the transmitted wave signal through welding joint.
4. according to the detection method of polyethylene pipe welding joint defect according to claim 1, it is characterized in that, when detecting polyethylene pipe welding joint, avoiding using couplant.
5. according to the detection method of polyethylene pipe welding joint defect according to claim 1, it is characterized in that, pyramidal horn antenna and welding joint outside surface carry out contact detection; Or, adopt pyramidal horn antenna to detect near the mode of welding joint outside surface.
1. and 2. 6. according to the detection method of polyethylene pipe welding joint defect according to claim 1, it is characterized in that, in microwave bridge, when 4. signal inputs from H arm, decile is in phase entered two other arms, and can not directly enter E arm 3.; When 1. and 2. two-arm external load impedance is equal and also positional symmetry time, 3. the reflection wave of two loads enters E arm by with equal size and contrary phase place, and can not enter H arm 4.; If at E arm 3. external coupling wave detector, then this wave detector be designated as zero, represent electric bridge reach balance, 1. and 2. the impedance of two-arm external load is equal; If two loaded impedances are unequal, E arm 3. just have export and non-vanishing, namely electric bridge is unbalance; In unbalanced bridge, if an arm connect is matched load, then electric bridge unbalance degree just represent another arm connect the not matching degree of load, so unbalanced bridge is in order to the microwave parameters of sensing lead;
During detection, the two-arm of microwave bridge connects reference sample and testing sample respectively by pyramidal horn antenna, enter wave detector after being subtracted from one another by the microwave signal that they reflect, compare with signal reference value after amplifier amplifies, detect the defect in welding joint with this.
7. according to the detection method of polyethylene pipe welding joint defect according to claim 1, it is characterized in that, welding joint is hot melting connector or electric fusion joint.
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| CN108344753A (en) * | 2017-01-25 | 2018-07-31 | 嘉兴市特种设备检验检测院 | Polyethylene pipe welding point defect inspection method based on vector network analyzer |
| CN109358077A (en) * | 2018-10-23 | 2019-02-19 | 济源市超光传感器系统工程有限公司 | A kind of metal crack detection device sensed using microwave |
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