CN105606883A - Weak current detection system based on FFT filtering - Google Patents
Weak current detection system based on FFT filtering Download PDFInfo
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- CN105606883A CN105606883A CN201510967060.5A CN201510967060A CN105606883A CN 105606883 A CN105606883 A CN 105606883A CN 201510967060 A CN201510967060 A CN 201510967060A CN 105606883 A CN105606883 A CN 105606883A
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- 238000001914 filtration Methods 0.000 title claims abstract description 30
- 238000001514 detection method Methods 0.000 title claims abstract description 27
- 230000006698 induction Effects 0.000 claims abstract description 17
- 230000003321 amplification Effects 0.000 claims abstract description 13
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 6
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Electromagnetism (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geophysics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention provides a weak current detection system based on an FFT filtering, a single-chip microcomputer module is supplied electric power through a power supply module, a signal output end of an induction coil module is connected with a single input end of the single-chip microcomputer module through a lowpass filtering module, a differential amplification module and an A/D acquiring module, an output end of a button module is connected with the single input end of the single-chip microcomputer module, a single output end of the single-chip microcomputer module is separately connected with signal input ends of an acousto-optic prompt module and a liquid crystal display module, and the single-chip microcomputer module performs filtering by adopting the FFT (fast fourier transform) method. According to the invention, compared with the detection method in the prior art, the detection system provided by the invention has relatively great improvement on detection sensitivity, the position and trend of an electric wire can be accurately acquired, and if the illuminating line wire is broken is detected; and a fault point can be found out to maintain conveniently.
Description
Technical field
The present invention relates to a kind of weak current detection system based on FFT filtering, be specifically related to detectTechnical field.
Background technology
In engineering, there are many occasions need to determine wire trend, and make nothing in the common body of wall of wireMethod observes directly circuit, and common test pencil also cannot direct detection. Because detecting within the wallsElectric wire, while boring on the wall, often occurs that electric wire is interrupted or cause the phenomenon of short circuit.
In order to solve in esse problem in this engineering, what generally adopt at present is that metal is visitedSurvey device and survey wire, but metal detector can only be surveyed existence and the trend of wire, and wireThe situation whether existence is broken can not detect.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of weak current based on FFT filteringDetection system, should the weak current detection system based on FFT filtering comprise induction coil module, lowPass filter module, differential amplification module, A/D acquisition module, one-chip computer module, key-press module,Power module, acousto-optic hint module and LCD MODULE; The signal of described induction coil moduleOutput is successively by low-pass filtering module, differential amplification module and A/D acquisition module and monolithicThe signal input part of machine module connects, and the output of key-press module and the signal of one-chip computer module are defeatedEnter end and connect, one-chip computer module is powered by power module, and one-chip computer module is defeated by I/O mouthGo out to connect liquid crystal display and acousto-optic hint module.
The present invention is achieved by the following technical programs.
A kind of weak current detection system based on FFT filtering provided by the invention, comprises the line of inductionCircle module, low-pass filtering module, differential amplification module, A/D acquisition module, one-chip computer module,Key-press module, power module, acousto-optic hint module and LCD MODULE, induction coil moduleDetect near live wire the alternating magnetic field that wire surrounding produces, described one-chip computer module is by power supplyModule for power supply, the signal output part of described induction coil module successively by low-pass filtering module,Differential amplification module is connected with the signal input part of one-chip computer module with A/D acquisition module, described inThe output of key-press module is connected with the signal input part of one-chip computer module, described one-chip computer moduleSignal output part connect with the signal input part of acousto-optic hint module and LCD MODULE respectivelyConnect, described one-chip computer module adopts the filtering of FFT FFT method.
Described induction coil module is copper core enamel-covered wire coiling.
Described low-pass filtering module is made up of operational amplifier LM358.
Described differential amplification module is made up of operational amplifier OP07.
The chip of described A/D acquisition module is TLC5510.
The master chip of described one-chip computer module is STM32F103C8T6.
Described LCD MODULE is 1602 liquid crystal displays.
Beneficial effect of the present invention is: this detection system can accurately be examined under cordlessMeasure the line current of the more than 5 watts consumer of power under mains-supplied condition, realize 2550 hertz of alternating currents more than milliampere detect; This device can also be by pressing key assignments simultaneouslyWithin the scope of 0 to 200 hertz, the alternating current of different frequency detects. This detection system is compared traditionDetection method in detection sensitivity, be enhanced, position that can Obtaining Accurate electric wireAnd move towards and detect illuminating line wire whether have broken string; Find out trouble point, convenient for maintaining.
Brief description of the drawings
Fig. 1 is theory diagram of the present invention.
Detailed description of the invention
Further describe technical scheme of the present invention below, but claimed scope is not limited toIn described.
A kind of weak current detection system based on FFT filtering as shown in Figure 1, comprises induction coilModule, low-pass filtering module, differential amplification module, A/D acquisition module, one-chip computer module,Key-press module, power module, acousto-optic hint module and LCD MODULE, induction coil moduleDetect near live wire the alternating magnetic field that wire surrounding produces, described one-chip computer module is by power supplyModule for power supply, the signal output part of described induction coil module successively by low-pass filtering module,Differential amplification module is connected with the signal input part of one-chip computer module with A/D acquisition module, described inThe output of key-press module is connected with the signal input part of one-chip computer module, described one-chip computer moduleSignal output part connect with the signal input part of acousto-optic hint module and LCD MODULE respectivelyConnect, described one-chip computer module adopts the filtering of FFT FFT method.
Described induction coil module is copper core enamel-covered wire coiling. Induction coil is copper core enamel-coverRich system three circles of line, 5 to 8 centimetres of diameters.
Described low-pass filtering module is made up of operational amplifier LM358. Low pass filter is by computingAmplifier LM358 forms one stairs active wave filter;
Described differential amplification module is made up of operational amplifier OP07. Differential amplification is put by computingLarge device OP07 forms high impedance difference amplifier, and its gain is 40dB;
The chip of described A/D acquisition module is TLC5510. TLC5510 is 8 ultra high speed A/D conversionChip.
The master chip of described one-chip computer module is STM32F103C8T6.
Described LCD MODULE is 1602 liquid crystal displays.
In acousto-optic hint module, auditory tone cues adopts buzzer, and light reminding module adopts red LED,Power system modules adopts two joint 1.5V, No. 7 dry cell power supplies; Key-press input adopts two solelyVertical button, can arrange the detection frequency of current sensing means by button, device scope be 0 to200HZ。
When frequency is that the electric current of 50 hertz can according to Faraday's electromagnetic induction law during by wireKnow, wire surrounding will produce the magnetic field of alternation; If now by induction coil near live wire (lineCircle plane is parallel with wire), induction coil two ends can produce its frequency of induced electromotive force and are also50 hertz.
This detection system detects frequency lower than the low-frequency alternating electric current of 200 hertz, therefore coil is connectThe electrical signal of reaction of receiving forms the active low pass of single order by one by operational amplifier LM358Wave filter filtering high-frequency interferencing signal; Wherein the cut-off frequency of one stairs active wave filter is250 hertz.
Through high impedance difference amplifier, (its gain is the signal of process low pass filter40dB), signal is amplified to 10000 times, and then amplifying signal is turned by high-speed a/dChange chip TLC5510 and carry out analog-to-digital conversion, its sample frequency is 500 hertz; Finally will changeTransfer of data is to STM32F103C8T6 single-chip microcomputer.
By button, measurement mechanism measuring frequency being set is set to 50 hertz (other frequency alsoCan); The A/D data of collection are carried out FFT FFT digital filtering sieve by single-chip microcomputerSelecting frequency is 50 hertz signals, if its signal averaging is greater than in certain threshold values explanation wireThere is electric current, otherwise do not have electric current to pass through; Last SCM system carries out sound according to the result of measuringLight prompting, and on display, show result (if wire has electric current to pass through buzzer warning,LED lamp flicker).
This detection system can accurately detect merit under mains-supplied condition under cordlessThe line current of the more than 5 watts consumer of rate, realizes 25 milliamperes of 50 hertz of above alternationsCurrent detecting; Simultaneously this device can also be by press difference within the scope of 0 to 200 hertz of key assignmentsThe alternating current of frequency detects. This detection system is compared traditional detection method in detection sensitivityOn be enhanced, position and trend that can Obtaining Accurate electric wire also detects illuminating line and leadsWhether line there is broken string; Find out trouble point, convenient for maintaining.
Claims (7)
1. the weak current detection system based on FFT filtering, comprises induction coil module, lowPass filter module, differential amplification module, A/D acquisition module, one-chip computer module, key-press module,Power module, acousto-optic hint module and LCD MODULE, induction coil module is led near chargedLine detects the alternating magnetic field that wire surrounding produces, and described one-chip computer module is powered by power module,It is characterized in that: the signal output part of described induction coil module is low-pass filtering module, poor successivelyDivide amplification module to be connected with the signal input part of one-chip computer module with A/D acquisition module, described pressingThe output of key module is connected with the signal input part of one-chip computer module, described one-chip computer moduleSignal output part is connected with the signal input part of acousto-optic hint module and LCD MODULE respectively,Described one-chip computer module adopts the filtering of FFT FFT method.
2. the weak current detection system based on FFT filtering as claimed in claim 1, its featureBe: described induction coil module is copper core enamel-covered wire coiling.
3. the weak current detection system based on FFT filtering as claimed in claim 1, its featureBe: described low-pass filtering module is made up of operational amplifier LM358.
4. the weak current detection system based on FFT filtering as claimed in claim 1, its featureBe: described differential amplification module is made up of operational amplifier OP07.
5. the weak current detection system based on FFT filtering as claimed in claim 1, its featureBe: the chip of described A/D acquisition module is TLC5510.
6. the weak current detection system based on FFT filtering as claimed in claim 1, its featureBe: the master chip of described one-chip computer module is STM32F103C8T6.
7. the weak current detection system based on FFT filtering as claimed in claim 1, its featureBe: described LCD MODULE is 1602 liquid crystal displays.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510967060.5A CN105606883A (en) | 2015-12-21 | 2015-12-21 | Weak current detection system based on FFT filtering |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510967060.5A CN105606883A (en) | 2015-12-21 | 2015-12-21 | Weak current detection system based on FFT filtering |
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| CN105606883A true CN105606883A (en) | 2016-05-25 |
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| CN201510967060.5A Pending CN105606883A (en) | 2015-12-21 | 2015-12-21 | Weak current detection system based on FFT filtering |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109581043A (en) * | 2018-12-25 | 2019-04-05 | 凯迈(洛阳)机电有限公司 | A kind of high direct voltage signal acquisition circuit |
| CN112147402A (en) * | 2019-06-28 | 2020-12-29 | 华东师范大学 | Non-contact current signal detection device and detection method based on stm32 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1700040A (en) * | 2005-05-25 | 2005-11-23 | 淄博威特电气有限公司 | Method and apparatus for visual indication of line location in metal pipe exploration |
| CN2775670Y (en) * | 2005-03-10 | 2006-04-26 | 中国人民解放军海缆通信技术研究中心 | Three dimension detector for sea cable |
| CN204101627U (en) * | 2014-10-08 | 2015-01-14 | 武汉大学 | A kind of data acquisition unit |
| CN104698339A (en) * | 2015-02-11 | 2015-06-10 | 国家电网公司 | Handheld fault finding instrument of power circuit in wall |
| US20150346255A1 (en) * | 2014-06-02 | 2015-12-03 | Hamilton Sundstrand Corporation | Method of detection and isolation of faults within power conversion and distribution systems |
-
2015
- 2015-12-21 CN CN201510967060.5A patent/CN105606883A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2775670Y (en) * | 2005-03-10 | 2006-04-26 | 中国人民解放军海缆通信技术研究中心 | Three dimension detector for sea cable |
| CN1700040A (en) * | 2005-05-25 | 2005-11-23 | 淄博威特电气有限公司 | Method and apparatus for visual indication of line location in metal pipe exploration |
| US20150346255A1 (en) * | 2014-06-02 | 2015-12-03 | Hamilton Sundstrand Corporation | Method of detection and isolation of faults within power conversion and distribution systems |
| CN204101627U (en) * | 2014-10-08 | 2015-01-14 | 武汉大学 | A kind of data acquisition unit |
| CN104698339A (en) * | 2015-02-11 | 2015-06-10 | 国家电网公司 | Handheld fault finding instrument of power circuit in wall |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109581043A (en) * | 2018-12-25 | 2019-04-05 | 凯迈(洛阳)机电有限公司 | A kind of high direct voltage signal acquisition circuit |
| CN112147402A (en) * | 2019-06-28 | 2020-12-29 | 华东师范大学 | Non-contact current signal detection device and detection method based on stm32 |
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Application publication date: 20160525 |