CN113625200B - In-situ detection method and detection device for performance degradation of coaxial connector - Google Patents
In-situ detection method and detection device for performance degradation of coaxial connector Download PDFInfo
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- CN113625200B CN113625200B CN202110937335.6A CN202110937335A CN113625200B CN 113625200 B CN113625200 B CN 113625200B CN 202110937335 A CN202110937335 A CN 202110937335A CN 113625200 B CN113625200 B CN 113625200B
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- 230000015556 catabolic process Effects 0.000 title claims abstract description 52
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 52
- 238000001514 detection method Methods 0.000 title claims abstract description 37
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000011159 matrix material Substances 0.000 claims abstract description 7
- 238000004613 tight binding model Methods 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims description 14
- 238000012360 testing method Methods 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 6
- 230000009916 joint effect Effects 0.000 claims description 5
- 230000000593 degrading effect Effects 0.000 claims 1
- 238000007689 inspection Methods 0.000 claims 1
- 238000011056 performance test Methods 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/68—Testing of releasable connections, e.g. of terminals mounted on a printed circuit board
- G01R31/69—Testing of releasable connections, e.g. of terminals mounted on a printed circuit board of terminals at the end of a cable or a wire harness; of plugs; of sockets, e.g. wall sockets or power sockets in appliances
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Abstract
An in-situ detection method and a detection device for performance degradation of a coaxial connector solve the problem of low performance test efficiency of the existing coaxial connector, and belong to the technical field of cable fault detection. The invention comprises the following steps: measuring scattering parameter S of a cable group with connectors m The method comprises the steps of carrying out a first treatment on the surface of the Determination of scattering parameter S caused by degradation of connector performance d ，S d ＝S m ‑S b ，S b Scattering parameters for the combined action of the connector and the cable during primary laying; solving whether peak curves of the performance parameters phi (x) of the connector are converged, if so, determining that the connector is degraded, otherwise, determining that the connector is not degraded;S 11 and S is 22 Respectively represent scattering parameters S d Two parameter values of the main diagonal of the parameter matrix of (a), g (x) represents the green function of the cable set, m represents the frequency point number of v, p is the number of arbitrary points x on the cable, and ||2 represents the square of the modulus.
Description
Technical Field
The invention relates to a method and a device for detecting and positioning performance degradation of a coaxial connector based on scattering parameters, and belongs to the technical field of cable fault detection.
Background
The connector is mainly used for connecting cables and transmitting signals, and is a key node of an electric circuit interconnection system, but the connector is exposed in a working environment for a long time and is subject to long-term effects of corrosion and vibration, so that performance degradation is easy to occur, and the connector is also a weak point for affecting the reliability of the electric circuit interconnection system. The existing connector performance degradation detection mainly separates the connector from the cable assembly, then tests the connector by means of a special testing instrument, and has the defects of complex implementation process, low detection efficiency and high cost. In addition, since the connector is usually fixed at the end of the cable, the connector is difficult to disassemble, the connector is damaged due to improper operation, the testing efficiency is seriously affected, and the connector fixed on the cable is difficult to recover after being disassembled.
Disclosure of Invention
Aiming at the problem of low performance testing efficiency of the existing coaxial connector, the invention provides an in-situ detection method and device for performance degradation of the coaxial connector.
The invention discloses an in-situ detection method for performance degradation of a coaxial connector, which comprises the following steps:
s1, measuring scattering parameter S of cable group with connector m ；
S2, calculating scattering parameters S caused by connector performance degradation d ，S d ＝S m -S b ，S b Scattering parameters for the combined action of the connector and the cable during primary laying;
s3, solving whether peak curves of the performance parameters phi (x) of the connector are converged, if so, determining that the connector is degraded, otherwise, determining that the connector is not degraded;
S 11 and S is 22 Respectively represent scattering parameters S d Two parameter values of the main diagonal of the parameter matrix of (a), g (x) represents the green function of the cable set, m represents the frequency point number of v, p is the number of arbitrary points x on the cable, | 2 Representing the square of the modulus.
As a preferred alternative to this,
l is the length of the cable group with the connector, l f Length of the connector from the reference port; beta is a phase constant; l (L) x The length of point x to a reference port, which is a port of the cable set, is indicated.
As a preferred alternative to this,
τ 1 、τ 2 time required for signal to propagate from two ports of cable set to connector with degraded performance' 1 、τ′ 2 Respectively the time required to propagate from the two ports to an arbitrary point x, ω representing the signal angular frequency.
Preferably, the cable set with a connector in S1 includes a plurality of connectors connected by cables;
and in the step S3, determining the position of the degenerated connector according to the corresponding relation between the position of the convergence point on the peak value curve and the position of the connector in the cable set.
Preferably, in S1, a scattering parameter S of the cable group with the connector is measured m The method of (1) is as follows:
connecting the cable set with the connector to a test port of the vector network analyzer, and selecting the measurement parameters of the vector network analyzer to obtain the common S parameters of the cable set with the connector.
Preferably, the scattering parameter S of the cable group with the connector is measured m Measurement parameters of a time-vector network analyzer and measurement of the scattering parameters S of the joint action of the connector and the cable during the primary laying b The measurement parameters of the time vector network analyzer are the same.
The invention also provides an in-situ detection device for performance degradation of the coaxial connector, which is characterized by comprising the following components:
a storage module for storing the joint action of the connector and the cable during the primary layingScattering parameter S of (2) b ；
A measuring module for measuring the scattering parameter S of the cable group with the connector m ；
The peak curve fitting module is simultaneously connected with the storage module and the measuring module and is used for acquiring scattering parameters S caused by the performance degradation of the connector d ，S d ＝S m -S b According to the scattering parameter S d Constructing connector performance parametersSolving whether peak curves of the performance parameters phi (x) of the connector are converged, if so, determining that the connector is degraded, otherwise, determining that the connector is not degraded;
S 11 and S is 22 Respectively represent scattering parameters S d Two parameter values of the main diagonal of the parameter matrix of (a), g (x) represents the green function of the cable set, m represents the frequency point number of v, p is the number of arbitrary points x on the cable, | 2 Representing the square of the modulus.
As a preferred alternative to this,
l is the length of the cable group with the connector, l f Length of the connector from the reference port; beta is a phase constant; l (L) x The length of point x to a reference port, which is a port of the cable set, is indicated.
As a preferred alternative to this,
τ 1 、τ 2 time required for signal to propagate from two ports of cable set to connector with degraded performance' 1 、τ′ 2 Respectively the time required to propagate from the two ports to point x, ω represents the signal angular frequency.
Preferably, the cable set with a connector includes a plurality of connectors connected by cables;
the peak curve fitting module is further used for determining the position of the degraded connector according to the corresponding relation between the position of the convergence point on the peak curve and the position of the connector in the cable group.
The invention has the beneficial effects that the connector to be tested is not required to be disassembled from the cable, the scattering parameter of the cable is only required to be measured as a comparison group when the cable group is first laid, the scattering parameter is different from the scattering parameter measured during maintenance, the scattering parameter only caused by the performance degradation of the connector can be obtained, the performance peak curve of the connector is obtained according to the parameter, and the performance degradation detection and the position positioning of the connector with the cable are determined according to the convergence point on the peak curve. According to the invention, the performance degradation detection of the connector in the cable assembly can be rapidly and accurately finished without separating the cable from the connector, the position of the performance degradation connector is pointed out, a novel method is provided for the performance degradation detection of the connector, and the detection efficiency is improved.
Drawings
FIG. 1 is a cable set scatter parameter measurement with connectors;
FIG. 2 is a graph showing the test results of the performance of a cable set with a connector corroded for 24 hours;
fig. 3 shows the test results of the performance of the cable with connector, which is corroded for 8 hours.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
An in-situ detection method for performance degradation of a coaxial connector according to the present embodiment includes:
step one, measuring scattering parameters S of a cable group with connectors during primary laying b ；
In this step, the connector to be tested is not required to be disassembled from the cable assembly, as shown in fig. 1, the connector to be tested and the connecting cable thereof are directly connected to the test port of the vector network analyzer, and parameters such as a proper frequency range, a scanning mode, scanning points, signal power and the like are selected, so that the common scattering parameters of the connecting cable and the connector to be tested can be obtained. During primary cabling of the cable assembly, scattering parameters of the combined action of the connector and the cable are measured and taken as a data base S b Save, when the component is considered healthy, S b The characteristics of background noise, connector joint loss and the like are mainly reflected.
Step two, measuring scattering parameter S of cable group with connector m ；
Scattering parameter measurements of the co-action of the connector and cable during regular maintenance. The scattering parameters of the combined action of the cable and the connector to be measured are measured according to the method shown in fig. 1, and the parameters such as the frequency range, the scanning mode, the scanning point number, the signal power and the like in the measurement are ensured to be consistent with those in the primary laying measurement, and the measured scattering parameters at the moment are recorded as S m . When the connector has performance degradation, S m Is the superposition of inherent features such as background noise and connector loss and connector degradation features.
Step three, calculating scattering parameters S caused by connector performance degradation d ：
S d ＝S m -S b Formula (1);
scattering parameter S measured in step two m Can be used forApproximately equivalent to S measured in step one b Scattering parameter S caused by degradation of connector performance d Therefore S can be added as shown in formula (1) m And S is equal to b Worse, a purer scattering parameter S is obtained, which is caused only by the degradation of the connector performance d Then to S d Further processing may be performed to achieve performance degradation detection of the connector.
Step four, solving whether peak curves of the performance parameters phi (x) of the connector are converged, if so, determining that the connector is degraded, otherwise, determining that the connector is not degraded;
the peak curve acquisition method of the connector performance parameter phi (x) comprises the following steps:
scattering parameter S after pretreatment of formula (1) d Treatment according to formula (2):
S 11 and S is 22 Respectively represent scattering parameters S d Two parameter values of the main diagonal in the parameter matrix;
then construct the green function g (x) of the cable set:
the maximum convergence point of the result obtained by the calculation of the formula (3) can realize the detection and the positioning of the performance degradation connector, and if no convergence point exists, the performance degradation of the connector in the cable assembly is not generated.
m represents the frequency point number of v, p is the number of arbitrary points x on the cable, || 2 Representing the square of the modulus.
According to the embodiment, the connector to be tested is not required to be disassembled from the cable, the scattering parameter of the cable group in the healthy state is only required to be measured as a comparison group when the cable group is first laid, the scattering parameter is different from the scattering parameter measured in the maintenance process, the scattering parameter only caused by the performance degradation of the connector can be obtained, and the performance degradation detection of the connector with the cable can be realized. The embodiment can realize performance degradation detection of various types of connectors such as corrosion, plug abrasion, insulation aging, breakage and the like. Compared with other connector performance degradation detection methods, the method of the embodiment has stronger operability and lower cost, and meanwhile, the detection workload can be greatly reduced and the working efficiency can be improved because the connector and the cable are tested together.
In a preferred embodiment of the present invention,
l is the length of the cable group with the connector, l f Length of the connector from the reference port; beta is a phase constant; l (L) x The length of point x to a reference port, which is a port of the cable set, is indicated.
The implementation is easy to realize and the cost is low;
in a preferred embodiment of the present invention,
τ 1 、τ 2 time required for signal to propagate from two ports of cable set to connector with degraded performance' 1 、τ′ 2 Respectively the time required to propagate from the two ports to an arbitrary point x, ω representing the signal angular frequency.
The cable set with a connector according to the present embodiment may include one connector or a plurality of connectors connected by cables;
and step four, determining the position of the degenerated connector according to the corresponding relation between the position of the convergence point on the peak value curve and the position of the connector in the cable set. The embodiment can realize the position positioning of the performance degradation connector while carrying out the performance degradation detection of the connector, and the position of the performance degradation connector can be indicated by only one measurement without the need of measuring the cable section by section for one cable with a plurality of connectors.
Specific examples:
BNC type coaxial connector is used as an experimental object, the BNC type coaxial connector is firstly connected with SYV-50-3-4 type coaxial cable to manufacture a new degradation detection sample of the connector with the cable, the lengths of cable components are 1m and 2m respectively, the experimental sample with the connector with the length of 3m is formed together, and the distance between the target connector and the reference port is 2m.
The scattering parameters of the experimental samples were first measured as controls. And then placing the experimental sample in an acid salt spray experimental box, binding and sealing other connectors to prevent corrosion, and carrying out salt spray corrosion on the target connector without any treatment to obtain a performance degradation sample. Samples are taken every 8 hours, and on the premise that the connector is not completely invalid, scattering parameters of the samples (comprising the cable and the connector) are measured, wherein the experimental time period is respectively five groups of 8 hours, 16 hours, 24 hours, 32 hours and 40 hours. And then, the scattering parameters obtained by measurement after corrosion are differed from the control group according to the formula (1), then the treatment is carried out according to the formulas (2) and (3), and whether the performance degradation of the connector occurs is judged according to whether peak curves in the calculation result are converged or not.
The experimental results show that after 24 hours of corrosion, the peak values of the calculated result curves are obviously converged at the position of the connector, and the connector is degraded in performance, and the result is shown in fig. 2. In fig. 2, the resulting peak curves calculated converge at about 2m, which corresponds to the position of the experimental connector in the cable assembly, enabling detection of degradation in connector performance. In contrast, 8h results are shown in fig. 3, and the connector performance degradation detection cannot be achieved.
The present embodiment also includes an in situ detection apparatus for performance degradation of a coaxial connector, the apparatus comprising:
a storage module for storing scattering parameters S of the joint action of the connector and the cable during the primary laying b ；
A measuring module for measuring the scattering parameter S of the cable group with the connector m ；
The peak curve fitting module is simultaneously connected with the storage module and the measuring module and is used for acquiring scattering parameters S caused by the performance degradation of the connector d ，S d ＝S m -S b According toScattering parameter S d Constructing connector performance parametersSolving whether peak curves of the performance parameters phi (x) of the connector are converged, if so, determining that the connector is degraded, otherwise, determining that the connector is not degraded;
S 11 and S is 22 Respectively represent scattering parameters S d Two parameter values of the main diagonal of the parameter matrix of (a), g (x) represents the green function of the cable set, m represents the frequency point number of v, p is the number of arbitrary points x on the cable, | 2 Representing the square of the modulus.
In a preferred embodiment of the present invention,
l is the length of the cable group with the connector, l f Length of the connector from the reference port; beta is a phase constant; l (L) x The length of point x to a reference port, which is a port of the cable set, is indicated.
In a preferred embodiment of the present invention,
τ 1 、τ 2 time, τ 'required for signals to travel from two ports of the cable set to the connector, respectively' 1 、τ′ 2 Respectively the time required to propagate from the two ports to point x.
In a preferred embodiment, the cable set with the connector includes a plurality of connectors, and the connectors are connected through cables;
the peak curve fitting module is further used for determining the position of the degraded connector according to the corresponding relation between the position of the convergence point on the peak curve and the position of the connector in the cable group.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein may be combined in ways other than as described in the original claims. It is also to be understood that features described in connection with separate embodiments may be used in other described embodiments.
Claims (10)
1. An in situ detection method for performance degradation of a coaxial connector, the method comprising:
s1, measuring scattering parameter S of cable group with connector m ；
S2, calculating scattering parameters S caused by connector performance degradation d ，S d ＝S m -S b ，S b Scattering parameters for the combined action of the connector and the cable during primary laying;
s3, solving whether peak curves of the performance parameters phi (x) of the connector are converged, if so, determining that the connector is degraded, otherwise, determining that the connector is not degraded;
S 11 and S is 22 Respectively represent scattering parameters S d Two parameter values of the main diagonal of the parameter matrix of (a), g (x) represents the green function of the cable set, m represents the frequency point number of v, p is the number of arbitrary points x on the cable, | 2 Representing the square of the modulus.
2. The method for in situ detection of performance degradation of a coaxial connector of claim 1,
l is the length of the cable group with the connector, l f Length of the connector from the reference port; beta is a phase constant; l (L) x The length of point x to a reference port, which is a port of the cable set, is indicated.
3. The method for in situ detection of performance degradation of a coaxial connector of claim 1,
τ 1 、τ 2 time τ required for signal propagation from two ports of cable set to performance-degraded connector, respectively 1 ′、τ 2 ' represents the time required to propagate from the two ports to any point x, respectively, ω represents the signal angular frequency.
4. A method for in-situ detection of performance degradation of a coaxial connector according to claim 2 or 3, wherein the cable set with a connector in S1 comprises a plurality of connectors connected by cables;
and in the step S3, determining the position of the degenerated connector according to the corresponding relation between the position of the convergence point on the peak value curve and the position of the connector in the cable set.
5. The method for in-situ detection of performance degradation of a coaxial connector according to claim 4, wherein in S1, a scattering parameter S of a cable group with a connector is measured m The method of (1) is as follows:
connecting the cable set with the connector to a test port of the vector network analyzer, and selecting measurement parameters of the vector network analyzer to obtain the coactive scattering parameters of the cable set with the connector.
6. The method for in-situ detection of performance degradation of a coaxial connector of claim 5, wherein the scattering parameter S of the cable assembly with the connector is measured m Measurement parameters of a time-vector network analyzer and measurement of the scattering parameters S of the joint action of the connector and the cable during the primary laying b The measurement parameters of the time vector network analyzer are the same.
7. An in situ inspection apparatus for performance degradation of a coaxial connector, said apparatus comprising:
a storage module for storing scattering parameters S of the joint action of the connector and the cable during the primary laying b ；
A measuring module for measuring the scattering parameter S of the cable group with the connector m ；
The peak curve fitting module is simultaneously connected with the storage module and the measuring module and is used for acquiring scattering parameters S caused by the performance degradation of the connector d ，S d ＝S m -S b According to the scattering parameter S d Constructing connector performance parametersSolving whether peak curves of the performance parameters phi (x) of the connector are converged, if so, determining that the connector is degraded, otherwise, determining that the connector is not degraded;
S 11 and S is 22 Respectively represent scattering parameters S d Two parameter values of the main diagonal of the parameter matrix of (a), g (x) represents the green function of the cable set, m represents the frequency point number of v, p is the number of arbitrary points x on the cable, | 2 Representing the square of the modulus.
8. An in situ detection apparatus for degradation of a coaxial connector as recited by claim 7 wherein,
l is the length of the cable group with the connector, l f Length of the connector from the reference port; beta is a phase constant; l (L) x The length of point x to a reference port, which is a port of the cable set, is indicated.
9. An in situ detection apparatus for degradation of a coaxial connector as recited by claim 7 wherein,
τ 1 、τ 2 time, τ, required for signals to travel from two ports of a cable set to a performance degrading connector, respectively 1 ′、τ 2 ' represents the time required to propagate from the two ports to any point x, respectively, ω represents the signal angular frequency.
10. An in situ test for the performance degradation of a coaxial connector as recited by claim 8 or 9 wherein said connectorized cable assembly comprises a plurality of connectors connected by cables;
the peak curve fitting module is further used for determining the position of the degraded connector according to the corresponding relation between the position of the convergence point on the peak curve and the position of the connector in the cable group.
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