CN117109420A - Cable length detection method - Google Patents
Cable length detection method Download PDFInfo
- Publication number
- CN117109420A CN117109420A CN202311063941.5A CN202311063941A CN117109420A CN 117109420 A CN117109420 A CN 117109420A CN 202311063941 A CN202311063941 A CN 202311063941A CN 117109420 A CN117109420 A CN 117109420A
- Authority
- CN
- China
- Prior art keywords
- value
- cable
- module
- length
- detecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 claims description 14
- 238000009434 installation Methods 0.000 claims description 10
- 238000012216 screening Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001028 reflection method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The invention discloses a cable length detection method, which belongs to the field of cable detection and solves the problem of lower detection precision of the cable length. The invention is mainly used for detecting the length of the cable more accurately.
Description
[ field of technology ]
The invention discloses a cable length detection method, and belongs to the technical field of cable detection.
[ background Art ]
The traditional cable length measuring equipment mainly comprises two types, namely a cable length measuring instrument based on an electric bridge method, wherein the cable length measuring instrument mainly measures the total length resistance value of a cable and then converts the total length of the cable with a universal standard resistance value of unit length. The other TDR cable fault distance measuring instrument based on the time domain pulse reflection method only needs to be connected with one end of a cable when in use, is mainly used for rough measurement of cable faults at present, and has the defects that different cables have wave speed uncertainty, only approximate data can be measured by referring to wave speed, and the requirement of accurate measurement cannot be met.
[ invention ]
The invention aims to solve the problem of low detection precision of the cable length, and provides a cable length detection method which can detect the cable length more accurately.
The technical problems are solved, and the invention adopts the following technical scheme:
the detection method of the cable length comprises a detection device for detecting the target cable length, wherein the detection device is provided with an installation module, a transmitting module, an acquisition module, a drawing module and a setting module, and the detection method comprises the following steps:
s1, manufacturing a cable sample with a known length, and recording the length of the cable sample as a standard value L a Connecting the cable sample to the installation module, and setting the wave velocity value v by the setting module a And electricityPreset differential pressure value V b ；
S2, a transmitting module transmits pulses, an acquisition module starts and acquires signals, and a drawing module draws a waveform chart according to acquired data;
s3, setting a time interval between two adjacent reading points according to a waveform display value of the waveform chart, marking as T, and calculating a voltage difference between the two adjacent reading points, marking as delta V;
s4, when DeltaV is larger than the preset voltage difference value V b Recording the time value of the reading point, which is recorded as t 1 Continuing scanning and further recording time values meeting the conditions, and sequentially recording as t 2 、t 3 …t n Screening the maximum value of DeltaV, calculating corresponding time value, and recording as t x ，t x ＝ΔV×T；
S5, calculating a measured length value L of the cable sample x ，L x ＝v a ×t x 2; the wave speed value is adjusted by the setting module, so that the measured length value L of the cable sample is recalculated x When L x And standard value L a When the wave velocity is closest to the current wave velocity value, the current wave velocity value is recorded as v j ；
S6, connecting the target cable to the installation module, and repeating the steps S2 to S5 and S5 to calculate the measured length value L of the target cable x Time v j Replacement v a I.e. L x ＝v j ×t x /2。
The beneficial effects of the invention are as follows:
according to the invention, through detecting and information acquisition of cable samples with known lengths, a drawing module in the detecting device draws a corresponding waveform according to data information acquired by the acquisition module, so that a user can more intuitively know the data information of the cable, meanwhile, the detecting device calculates the measured length of the cable samples according to the data information, compares the calculated result with the standard value of the cable samples, repeatedly detects by adjusting a wave velocity value until the calculated result is close to the standard value when the calculated result is large in difference from the standard value, and then completes calibration of the wave velocity value, a target cable is connected to the detecting device, and the target cable is detected according to the calibrated wave velocity value, so that the actual length of the target cable is calculated.
Preferably, the cable sample has a length of less than 10m, i.e. L a <10m. By adopting the technical scheme, the length of the cable sample is smaller, so that the standard value is closer to the actual length of the cable sample, the calibrated wave velocity value is more accurate, and the detection result of the target cable is more accurate; in addition, the length of the cable sample point is smaller than 10m, so that the detection speed of the detection device on the cable sample can be increased, the detection precision is improved, the possibility of error occurrence is reduced, and the detection precision on the cable sample is effectively improved.
Preferably, the detecting device further includes a display module for displaying the waveform chart, and in S1, the waveform display value of the waveform chart is set to be greater than the length of the cable connected to the detecting device through the setting module. By adopting the technical scheme, the waveform display value is relatively close to the length of the cable sample, and the display resolution of the waveform chart can be improved.
Preferably, the acquisition module adopts a 10-bit channel for data acquisition.
Preferably, the detection device further includes a storage module, and the data collected by the collection module in S2 is cached by the storage module.
Preferably, in the step S3, the voltage difference is compared from the nth reading point to the rear, n is more than or equal to 100, and the voltage difference DeltaV between two adjacent reading points is calculated. By adopting the technical scheme, as the read point which is just started has a certain error, the read point which has the error in front is avoided, the error rate in the detection process can be reduced, and the accuracy of the detection result is further improved.
Preferably, the setting module is provided with a function for adjusting the wave velocity value v a The rotation of the adjustment knob clockwise by one grid indicates that the wave speed value is increased by one minimum unit, and the rotation of the adjustment knob anticlockwise by one minimum unit indicates that the wave speed value is reduced by one minimum unit, and the minimum unit is 1 m/mu s.
Other features and advantages of the present invention will be disclosed in the following detailed description of the invention and the accompanying drawings.
[ description of the drawings ]
The invention is further described with reference to the accompanying drawings:
fig. 1 is a flow chart of a method for detecting cable length according to the present invention.
[ detailed description ] of the invention
The technical solutions of the embodiments of the present invention will be explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
As shown in fig. 1, this embodiment illustrates a method for detecting a cable length, including a detection device for detecting a target cable length, where the detection device includes an installation module, an emission module, an acquisition module, a drawing module, a setting module, a display module and a storage module, where the installation module is used for connecting a cable, the emission module is used for emitting pulses to the cable, the acquisition module is used for acquiring data information of the cable, the drawing module performs waveform drawing according to the data acquired by the acquisition module, the setting module can be used for a user to input or adjust various values, and the display module is used for displaying the waveform drawing and the storage module is used for storing the data formed in the detection process.
The flow of detection and release in this embodiment is as follows:
s1, manufacturing a cable sample with a known length, and recording the length of the cable sample as a standard value L a Connecting the cable sample to the installation module, and setting the wave velocity value v by the setting module a And a preset voltage difference value V b ；
The cable sample is the same type of cable as the target sample, and the length of the cable sample is less than 10m, namely L a <10m, the smaller length of the cable sample can enable the standard value to be closer to the actual length of the cable sample, so that the calibrated wave velocity value is more accurate, and the detection result of the target cable is more accurate; in addition, the length of the cable sample point is smaller than 10m, so that the detection speed of the detection device on the cable sample can be increased, and the detection is improvedThe accuracy is reduced, the possibility of error occurrence is reduced, and the detection accuracy of the cable sample is effectively improved.
And in the step S1, the waveform display value of the waveform chart is set to be larger than the length of the cable connected with the detection device through the setting module, in the embodiment, the waveform display value is 100m, the waveform display value is relatively close to the length of the cable sample, and the display resolution of the waveform chart can be improved.
S2, a transmitting module transmits pulses, an acquisition module starts and acquires signals, and a drawing module draws a waveform chart according to acquired data;
it should be noted that, the signal pulse width of the transmitting module is set to 200ns, the acquisition rate of the acquisition module is 400M, and data acquisition is performed by adopting 10-bit channels, in addition, in this embodiment, the waveform display amplitude scaling factor is set to 5, the maximum display voltage is 15V, the signal acquisition gain is set to 1, and then the data acquired by the acquisition module is buffered by the storage module.
S3, setting a time interval between two adjacent reading points according to a waveform display value of the waveform chart, marking as T, and calculating a voltage difference between the two adjacent reading points, marking as delta V;
it should be noted that, in the step S3, the comparison of the voltage differences is performed from the nth reading point to the rear, n is greater than or equal to 100, and the voltage difference Δv between the two adjacent reading points is calculated, and since a certain error exists in the newly started reading point, the reading point with the error is avoided, the error rate in the detection process can be reduced, and the accuracy of the detection result is further improved.
S4, when DeltaV is larger than the preset voltage difference value V b Recording the time value of the reading point, which is recorded as t 1 Continuing scanning and further recording time values meeting the conditions, and sequentially recording as t 2 、t 3 …t n Screening the maximum value of DeltaV, calculating corresponding time value, and recording as t x ，t x ＝ΔV×T；
S5, calculating a measured length value L of the cable sample x ，L x ＝v a ×t x 2; the wave speed value is adjusted through the setting module, so that the cable sample is recalculatedThe measurement length value L of the book x When L x And standard value L a When the wave velocity is closest to the current wave velocity value, the current wave velocity value is recorded as v j ；
The setting module is provided with a function of adjusting the wave velocity value v a The rotation of the adjustment knob clockwise by one grid indicates that the wave speed value is increased by one minimum unit, and the rotation of the adjustment knob anticlockwise by one minimum unit indicates that the wave speed value is reduced by one minimum unit, and the minimum unit is 1 m/mu s.
S6, connecting the target cable to the installation module, and repeating the steps S2 to S5 and S5 to calculate the measured length value L of the target cable x Time v j Replacement v a I.e. L x ＝v j ×t x /2。
According to the detection device, through detecting and information acquisition on a cable sample with a known length, a drawing module in the detection device draws a corresponding waveform according to data information acquired by the acquisition module, so that a user can more intuitively know the data information of the cable, meanwhile, the detection device calculates the measured length of the cable sample according to the data information, compares a calculation result with a standard value of the cable sample, repeatedly detects through adjusting a wave speed value until the calculation result is close to the standard value when the calculation result is large in difference from the standard value, completes calibration of the wave speed value, then connects a target cable to the detection device, detects the target cable according to the calibrated wave speed value, and accordingly calculates the actual length of the target cable.
The actual case detection procedure in this embodiment is as follows:
1. selecting a target cable with the length of 3m as a cable sample, namely the length of the cable sample is a standard value L a =3m; the cable sample is connected to the mounting module,setting the wave velocity value v by a setting module a =170 m/μs and a voltage difference preset value V b ＝0.8V；
2. The waveform display value in the display module is set to be 100m, and 10000 data points are stored in total;
3. setting a time interval T=0.5 ns between two adjacent reading points according to a waveform display value of the waveform chart, and calculating a voltage difference between the two adjacent reading points, and recording the voltage difference as delta V;
4. screening the maximum value of DeltaV, and calculating the corresponding time value t x ：
t x ＝ΔV×T＝68×0.5＝34ns；
5. Calculating a measured length value L of a cable sample x ：
It should be noted that, in this embodiment, the calculation result of the measured length value of the cable sample is carried and remains in the last position of the decimal point;
6. the wave speed value is adjusted to v by the setting module a ＝174m/μs；
7. Recalculating the measured length value L of the cable x ：
The measured value L x And standard value L a Closest, therefore, the wave velocity calibration is completed, and the calibrated wave velocity value v a ＝174m/μs；
8. Selecting a 1500m section of target cable; setting wave velocity value v a =170 m/μs and a voltage difference preset value V b ＝0.8V；
9. The waveform display value in the display module is set to 2000m;
10. setting a time interval t=10ns between two adjacent reading points according to a waveform display value of the waveform chart;
11. screeningThe maximum value of DeltaV is obtained, and the corresponding time value t is calculated x ：
t x ＝ΔV×T＝1728×10＝17280ns；
12. Calculating a measured length value L of a cable x ：
13. The actual length of the target cable is 1503.4 meters.
While the invention has been described in terms of embodiments, it will be appreciated by those skilled in the art that the invention is not limited thereto but rather includes the drawings and the description of the embodiments above. Any modifications which do not depart from the functional and structural principles of the present invention are intended to be included within the scope of the appended claims.
Claims (7)
1. The method for detecting the cable length is characterized by comprising the following steps of: the detection device comprises a detection device for detecting the length of a target cable, wherein the detection device is provided with an installation module, a transmitting module, an acquisition module, a drawing module and a setting module, and the detection method comprises the following steps:
s1, manufacturing a cable sample with a known length, and recording the length of the cable sample as a standard value L a Connecting the cable sample to the installation module, and setting the wave velocity value v by the setting module a And a preset voltage difference value V b ；
S2, a transmitting module transmits pulses, an acquisition module starts and acquires signals, and a drawing module draws a waveform chart according to acquired data;
s3, setting a time interval between two adjacent reading points according to a waveform display value of the waveform chart, marking as T, and calculating a voltage difference between the two adjacent reading points, marking as delta V;
s4, when DeltaV is larger than the preset voltage difference value V b Recording the time value of the reading point, which is recorded as t 1 Continuing scanning and further recording time values meeting the conditions, and sequentially recording as t 2 、t 3 …t n Screening the maximum value of DeltaV, calculating corresponding time value, and recording as t x ，t x ＝ΔV×T；
S5, calculating a measured length value L of the cable sample x ，L x ＝v a ×t x 2; the wave speed value is adjusted by the setting module, so that the measured length value L of the cable sample is recalculated x When L x And standard value L a When the wave velocity is closest to the current wave velocity value, the current wave velocity value is recorded as v j ；
S6, connecting the target cable to the installation module, and repeating the steps S2 to S5 and S5 to calculate the measured length value L of the target cable x Time v j Replacement v a I.e. L x ＝v j ×t x /2。
2. A method of detecting a cable length according to claim 1, wherein: the cable sample has a length of less than 10m, i.e. L a <10m。
3. A method of detecting a cable length according to claim 2, wherein: the detection device further comprises a display module for displaying the waveform chart, and the waveform display value of the waveform chart is set to be larger than the length of the cable connected with the detection device through the setting module in S1.
4. A method of detecting a cable length according to claim 1, wherein: the acquisition module adopts a 10-bit channel to acquire data.
5. A method of detecting a cable length according to claim 1, wherein: the detection device further comprises a storage module, and the data acquired by the acquisition module in the step S2 are cached through the storage module.
6. A method of detecting a cable length according to claim 1, wherein: and in the step S3, voltage difference comparison is carried out backwards from the nth reading point, n is more than or equal to 100, and the voltage difference delta V between two adjacent reading points is calculated.
7. A method of detecting a cable length according to claim 1, wherein: the setting module is provided with a device for adjusting the wave velocity value v a The rotation of the adjustment knob clockwise by one grid indicates that the wave speed value is increased by one minimum unit, and the rotation of the adjustment knob anticlockwise by one minimum unit indicates that the wave speed value is reduced by one minimum unit, and the minimum unit is 1 m/mu s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311063941.5A CN117109420A (en) | 2023-08-22 | 2023-08-22 | Cable length detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311063941.5A CN117109420A (en) | 2023-08-22 | 2023-08-22 | Cable length detection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117109420A true CN117109420A (en) | 2023-11-24 |
Family
ID=88808657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311063941.5A Pending CN117109420A (en) | 2023-08-22 | 2023-08-22 | Cable length detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117109420A (en) |
-
2023
- 2023-08-22 CN CN202311063941.5A patent/CN117109420A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5096419A (en) | Apparatus and method for detecting an apical position | |
| US6626038B1 (en) | Time domain reflectometry measurement instrument | |
| CN105973947B (en) | TDS value measuring method and measuring system | |
| US9791481B2 (en) | Differential voltage measurement | |
| US6517240B1 (en) | Ultrasonic thermometer system | |
| CN111024006A (en) | Roughness detection method and roughness detection device | |
| CN111208175A (en) | Sensor identification method and device and object to be tested test equipment | |
| WO1993008477A1 (en) | SELF DIAGNOSTIC pH SENSOR | |
| GB2103369A (en) | Measuring hardness of rubber and plastics | |
| CN106908800B (en) | Method for improving pulse ranging precision and pulse ranging equipment | |
| CN117109420A (en) | Cable length detection method | |
| CN113951810A (en) | Calibration method and vision detection system for terminal screen display sighting target | |
| EP0213407A2 (en) | Method and apparatus for body temperature measurement with multiple probe types | |
| CN111024186B (en) | Microwave level meter step response time measuring device and method | |
| CN111207857B (en) | Method for measuring optical fiber length by using distributed optical fiber temperature sensor | |
| CN101957165B (en) | Measuring apparatus for internal diameter of small deep hole | |
| CN113945134A (en) | Zero drift measuring device and method for sliding micrometer | |
| CN209820655U (en) | Dynamic temperature calibration device | |
| CN113655260B (en) | Picture processing method and device | |
| EP0505075A2 (en) | Calibration method for inspecting the wall thickness of containers | |
| CN218066670U (en) | Water level measuring device | |
| CN214334110U (en) | Automatic wind pressure acquisition device of zero-bit calibration | |
| JP3015597B2 (en) | Method and apparatus for calibrating the horizontal electronic scale of an oscilloscope | |
| CN116609715B (en) | Double-exponential-wave pulse shape parameter measurement error estimation method | |
| CN219141665U (en) | Survey and drawing scale convenient to adjust |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |