CN113625200B - An in-situ detection method and detection device for coaxial connector performance degradation - Google Patents

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

An in-situ detection method and detection device for coaxial connector performance degradation

Technical field

The invention relates to a method and device for detecting and locating the performance degradation of a coaxial connector based on scattering parameters, and belongs to the technical field of cable fault detection.

Background technique

The connector is mainly responsible for connecting cables and transmitting signals, and is a key node of the electrical interconnection system. However, the connector is exposed to the working environment for a long time, is subject to long-term corrosion and vibration, and is prone to performance degradation. Therefore, the connector also affects the electrical circuit. Weak points in the reliability of line interconnection systems. The existing connector performance degradation detection mainly involves separating the connector from the cable assembly and then testing it with the help of special testing instruments. The implementation process is complex, the detection efficiency is low, and the cost is high. In addition, since the connector is usually fixed at the end of the cable, it is difficult to disassemble. Improper operation will cause damage to the connector and seriously affect the test efficiency. Moreover, for the connector fixed on the cable, it will be difficult to restore after disassembly. .

Contents of the invention

Aiming at the problem of low performance testing efficiency of existing coaxial connectors, the present invention provides an in-situ detection method and detection device for performance degradation of coaxial connectors.

An in-situ detection method for coaxial connector performance degradation of the present invention, the method includes:

S1. Measure the scattering parameter S _m of the cable set with connector;

S2. Calculate the scattering parameter S _d caused by the degradation of connector performance, S _d =S _m -S _b , S _b is the scattering parameter of the joint action of the connector and the cable during initial laying;

S3. Find whether the peak curves of the connector performance parameter Φ(x) converge. If a convergence point appears, it is determined that the connector has degraded. Otherwise, it is determined that the connector has not degraded in performance;

S ₁₁ and S ₂₂ respectively represent the two parameter values of the main diagonal in the parameter matrix of the scattering parameter S _d . g(x) represents the Green's function of the cable group, m represents the number of frequency points of v, and p is the frequency of any point x on the cable. number, || ² represents the square of the modulus value.

As a preference,

l is the length of the cable group with connector, l _f is the length from the connector to the reference port; β is the phase constant; l _x represents the length from point x to the reference port, and the reference port is a certain port of the cable group.

As a preference,

τ ₁ and τ ₂ are the time required for the signal to propagate from the two ports of the cable group to the connector with degraded performance respectively. τ′ ₁ and τ′ ₂ respectively represent the time required for the signal to propagate from the two ports to any point x. , ω represents the signal angular frequency.

Preferably, the cable set with connectors in S1 includes multiple connectors, and the multiple connectors are connected by cables;

In S3, the position of the degraded connector is determined based on the corresponding relationship between the position of the convergence point on the peak curve and the position of the connector in the cable group.

Preferably, in S1, the method for measuring the scattering parameter S _m of the cable group with connectors is:

Connect the cable set with connectors to the test port of the vector network analyzer, select the measurement parameters of the vector network analyzer, and obtain the common S parameters of the cable set with connectors.

Preferably, the measurement parameters of the vector network analyzer when measuring the scattering parameter S _m of the cable set with connectors are the same as the measurement parameters of the vector network analyzer when measuring the scattering parameter S _b of the joint action of the connector and the cable during initial laying.

The present invention also provides an in-situ detection device for coaxial connector performance degradation, which is characterized in that the device includes:

The storage module is used to store the scattering parameter S _b of the joint action of the connector and the cable during initial laying;

Measuring module for measuring the scattering parameter S _m of cable sets with connectors;

The peak curve fitting module is connected to the storage module and the measurement module at the same time, and is used to obtain the scattering parameter S _d caused by the degradation of connector performance, S _d =S _m -S _b , and construct the connector performance parameters based on the scattering parameter S _d Find whether the peak curves of the connector performance parameter Φ(x) converge. If a convergence point appears, it is determined that the connector has degraded. Otherwise, it is determined that the connector has not degraded in performance;

S ₁₁ and S ₂₂ respectively represent the two parameter values of the main diagonal in the parameter matrix of the scattering parameter S _d . g(x) represents the Green's function of the cable group, m represents the number of frequency points of v, and p is the frequency of any point x on the cable. number, || ² represents the square of the modulus value.

As a preference,

l is the length of the cable group with connector, l _f is the length from the connector to the reference port; β is the phase constant; l _x represents the length from point x to the reference port, and the reference port is a certain port of the cable group.

As a preference,

τ ₁ and τ ₂ are the time required for the signal to propagate from the two ports of the cable group to the connector with degraded performance respectively. τ′ ₁ and τ′ ₂ respectively represent the time required for the signal to propagate from the two ports to point x. ω represents the signal angular frequency.

Preferably, the cable set with connectors includes a plurality of connectors, and the plurality of connectors are connected by cables;

The peak curve fitting module is also used to determine the position of the degraded connector based on the corresponding relationship between the position of the convergence point on the peak curve and the position of the connector in the cable group.

The beneficial effects of the present invention are that the present invention does not need to disassemble the connector to be tested from the cable. It only needs to measure the scattering parameters of the healthy state when the cable group is first laid as a control group, and compare it with the scattering parameters measured during maintenance. It is possible to obtain only the scattering parameters caused by connector performance degradation, obtain the performance peak curve of the connector based on this parameter, and determine the connector degradation detection and position positioning with cables based on the convergence point on the peak curve. The present invention can quickly and accurately complete the performance degradation detection of the connector in the cable assembly without separating the cable and the connector, points out the location of the performance degradation connector, provides a new method for the performance degradation detection of the connector, and improves the performance degradation detection of the connector. improve detection efficiency.

Description of the drawings

Figure 1 shows the measurement of scattering parameters of a cable set with connectors;

Figure 2 shows the cable set with connectors corroded for 24 hours, and the performance test results of the connectors with cables;

Figure 3 shows the cable set with connectors corroded for 8 hours, and the performance test results of the connectors with cables.

Detailed ways

The technical solutions 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. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without any creative work fall within the scope of protection of the present invention.

It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but shall not be used as a limitation of the present invention.

An in-situ detection method for coaxial connector performance degradation in this embodiment includes:

Step 1. Measure the scattering parameter S _b of the cable group with connectors during initial laying;

This step does not require disassembling the connector to be tested from the cable assembly. As shown in Figure 1, directly connect the connector to be tested and its connecting cable to the test port of the vector network analyzer. Select the appropriate frequency range, scanning method, By scanning parameters such as the number of points and signal power, the common scattering parameters of the connecting cable and the connector under test can be obtained. When the cable assembly is first laid, the scattering parameters of the connector and cable are measured and saved as the data basis S _b . At this time, the component is considered healthy, so S _b mainly reflects the background noise and connector joint loss, etc. feature.

Step 2: Measure the scattering parameter S _m of the cable set with connector;

Measurement of scattering parameters from the interaction of connectors and cables during periodic maintenance. Still measure the scattering parameters of the cable and the connector under test according to the method shown in Figure 1. At the same time, ensure that the frequency range, scanning method, number of scanning points, signal power and other parameters during this measurement are consistent with those during the initial laying measurement. Record this time The measured scattering parameter is S _m . When connector performance degradation occurs, S _m is the superposition of inherent characteristics such as background noise and connector loss and connector degradation characteristics.

Step 3: Find the scattering parameter S _d caused by connector performance degradation:

S _d =S _m -S _b formula (1);

The scattering parameter S _m measured in step 2 can be approximately equivalent to the superposition of S _b measured in step 1 and the scattering parameter S _d caused by connector performance degradation. Therefore, S _m can be combined with S m as shown in Equation (1). By difference S _b , a relatively pure scattering parameter S _d caused only by connector performance degradation is obtained, and then S _d is further processed to achieve connector performance degradation detection.

Step 4: Find whether the peak curves of the connector performance parameter Φ(x) converge. If a convergence point appears, it is determined that the connector has degraded. Otherwise, it is determined that the connector has not degraded in performance;

The method to obtain the peak curve of the connector performance parameter Φ(x) is:

The scattering parameter S _d preprocessed by equation (1) is processed according to equation (2):

S ₁₁ and S ₂₂ respectively represent the two parameter values of the main diagonal corners in the parameter matrix of the scattering parameter S _d ;

Then construct the Green's function g(x) of the cable group:

The maximum value convergence point calculated through equation (3) can detect and locate performance-degraded connectors. If there is no convergence point, it indicates that the connector in the cable assembly has not experienced performance degradation.

m represents the number of frequency points of v, p is the number of any point x on the cable, || ² represents the square of the modulus value.

This implementation method does not need to disassemble the connector to be tested from the cable. It only needs to measure the scattering parameters of the healthy state when the cable group is first laid as a control group. The only difference can be obtained by comparing it with the scattering parameters measured during maintenance. Scattering parameters caused by connector performance degradation enable connector performance degradation detection with cables. This implementation can realize various types of connector performance degradation detection such as corrosion, plugging and unplugging wear, insulation aging, and damage. Compared with other forms of connector performance degradation detection methods, the method of this embodiment is more operable and lower cost. At the same time, since the connector and cable are tested together, the detection workload can be greatly reduced and work efficiency improved.

In a preferred embodiment,

l is the length of the cable group with connector, l _f is the length from the connector to the reference port; β is the phase constant; l _x represents the length from point x to the reference port, and the reference port is a certain port of the cable group.

This implementation is easy to implement and has low cost;

In a preferred embodiment,

τ ₁ and τ ₂ are the time required for the signal to propagate from the two ports of the cable group to the connector with degraded performance respectively. τ′ ₁ and τ′ ₂ respectively represent the time required for the signal to propagate from the two ports to any point x. , ω represents the signal angular frequency.

The cable set with connectors in this embodiment may include one connector or multiple connectors, and the multiple connectors may be connected by cables;

In step four, the position of the degraded connector is determined based on the corresponding relationship between the position of the convergence point on the peak curve and the position of the connector in the cable group. This implementation method can detect the performance degradation of the connector while locating the position of the performance degradation connector. For a cable with multiple connectors, it is not necessary to measure segment by segment, and the performance degradation can be indicated by just one measurement. connector location.

Specific examples:

Taking the BNC type coaxial connector as the experimental object, first connect it with the SYV-50-3-4 type coaxial cable to make a connector new energy degradation detection sample with a cable. The cable assembly lengths are 1m and 2m respectively, which together form 3m long experimental sample with connector, the target connector is 2m away from the reference port.

First, the scattering parameters of the experimental sample were measured as a control. Then the experimental sample is placed in the acidic salt spray test chamber, and the remaining connectors are wrapped and sealed to prevent corrosion. The target connector is not subjected to any treatment, and salt spray corrosion is performed on it to obtain performance degradation samples. Take out the sample every 8 hours, and measure the scattering parameters of the sample (including cables and connectors) on the premise of confirming that the connector has not completely failed. The experiment duration is 8 hours, 16 hours, 24 hours, 32 hours, and 40 hours. Then, the scattering parameters measured after corrosion are compared with the control group according to formula (1), and then processed according to formulas (2) and (3). Based on whether the peak curves in the calculation results converge, it is judged whether the connector has performance degradation.

The experimental results show that after 24 hours of corrosion, the peak value of the calculated curve converges significantly at the location of the connector, and the performance of the connector deteriorates. The results are shown in Figure 2. In Figure 2, the calculated peak curves converge at about 2m, which corresponds to the position of the experimental connector in the cable assembly, enabling the detection of connector performance degradation. For comparison, the 8h results are shown in Figure 3, and connector performance degradation detection cannot be achieved.

This embodiment also includes an in-situ detection device for coaxial connector performance degradation, which device includes:

The storage module is used to store the scattering parameter S _b of the joint action of the connector and the cable during initial laying;

Measuring module for measuring the scattering parameter S _m of cable sets with connectors;

The peak curve fitting module is connected to the storage module and the measurement module at the same time, and is used to obtain the scattering parameter S _d caused by the degradation of connector performance, S _d =S _m -S _b , and construct the connector performance parameters based on the scattering parameter S _d Find whether the peak curves of the connector performance parameter Φ(x) converge. If a convergence point appears, it is determined that the connector has degraded. Otherwise, it is determined that the connector has not degraded in performance;

S ₁₁ and S ₂₂ respectively represent the two parameter values of the main diagonal in the parameter matrix of the scattering parameter S _d . g(x) represents the Green's function of the cable group, m represents the number of frequency points of v, and p is the frequency of any point x on the cable. number, || ² represents the square of the modulus value.

In a preferred embodiment,

l is the length of the cable group with connector, l _f is the length from the connector to the reference port; β is the phase constant; l _x represents the length from point x to the reference port, and the reference port is a certain port of the cable group.

In a preferred embodiment,

τ ₁ and τ ₂ are the time required for the signal to propagate from the two ports of the cable group to the connector respectively, and τ′ ₁ and τ′ ₂ respectively represent the time required for the signal to propagate from the two ports to point x.

In a preferred embodiment, the cable set with connectors includes multiple connectors, and the multiple connectors are connected by cables;

The peak curve fitting module is also used to determine the position of the degraded connector based on the corresponding relationship between the position of the convergence point on the peak curve and the position of the connector in the cable group.

Although the present invention is described herein with reference to specific embodiments, it is to be understood that these embodiments are merely exemplary of the principles and applications of the invention. It is therefore to be understood that many modifications may be made to the exemplary embodiments and other arrangements may be devised without departing from the spirit and scope of the invention as defined by the appended claims. It is to be understood that the features described in the different dependent claims may be combined in a different manner than that described in the original claims. It will also be understood that features described in connection with individual embodiments can 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.