CN105588873A - Externally-passing type low frequency electromagnetic testing device - Google Patents
Externally-passing type low frequency electromagnetic testing device Download PDFInfo
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- CN105588873A CN105588873A CN201610160798.5A CN201610160798A CN105588873A CN 105588873 A CN105588873 A CN 105588873A CN 201610160798 A CN201610160798 A CN 201610160798A CN 105588873 A CN105588873 A CN 105588873A
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- low frequency
- coil
- frequency electromagnetic
- impedance analyzer
- checkout gear
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/74—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids
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- Chemical Kinetics & Catalysis (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention discloses an externally-passing type low frequency electromagnetic testing device. The device is characterized by being composed of an impedance analyzer (1), a coil (2) and an acrylic acid pipe (3); the acrylic acid pipe (3) is arranged in the middle of the coil (2), and the impedance analyzer (1) is connected to the coil (2). According to the externally-passing type low frequency electromagnetic testing device, low frequency signals serve as excitation signals, the detect depth is increased, and the device is simple in structure, convenient and fast in testing, low in cost and capable of being applied to various practical projects.
Description
Technical field
A kind of outer through mode low frequency electromagnetic checkout gear, belongs to detection field.
Background technology
Now, Dynamic Non-Destruction Measurement has applied in real production, life, as the detection of Metal Crack, liquid widelyDetection, structural quality detect in. But the frequency of using in most Non-Destructive Testings at present concentrates on megahertz. As answeredWhat detect ducted oil utilization with multiphase flow radio frequency sensor is exactly high-frequency electromagnetism. But due to the existence of Kelvin effect,The degree of depth detecting is often restricted. If therefore can find a kind of method to improve the method that detects the degree of depth, just can greatly improve detectionThe accuracy of speed and detection, for enterprise, more can increase the benefit. Most liquid is all nonmagnetic substance, theyElectrical conductivity be less than 100S/m. If therefore application low frequency electromagnetic just can improve the degree of depth of detection greatly. So just mean andThe center of sample when row liquid detecting, can be detected.
In theory is calculated, the inductance of coil does not change with the variation of frequency, but really not so in actual experiment, along with frequentlyRate reaches certain value, and the inductance of coil can decline thereupon, and different samples can make the change amount difference of inductance. According to this spyPoint, we just can design a kind of simple, easily low frequency electromagnetic checkout gear.
Summary of the invention
The object of the present invention is to provide a kind of outer through mode low frequency electromagnetic checkout gear. It is real that this device can be applied low frequency electromagneticNow to pipeline, bottled interior liquid detecting. There is the features such as simple, easy operating, sensitivity height.
The present invention is achieved through the following technical solutions:
A kind of outer through mode low frequency electromagnetic checkout gear, is characterized in that: by electric impedance analyzer (1), coil (2), propylene acid tube(3) composition; Propylene acid tube (3) is placed in the middle of coil (2), and electric impedance analyzer (1) is connected to coil (2).
The outer through mode low frequency electromagnetic checkout gear of described one, is characterized in that: the low level current that electric impedance analyzer (1) producesAmplitude is 20mA; The scope of frequency sweep is between 0-100KHz; Frequency bandwidth is 125Hz; The inductance of coil is 410mH.
Operation principle of the present invention is: the present invention utilizes electromagnetic induction principle and every kind of principle that liquid electric conductivity is different, Yi JiThe phenomenon that the increase coil inductance along with frequency of finding in experiment can change, adopt outer through mode method detection pipeline,Bottled middle liquid. Detected sample difference, electrical conductivity is different, and the change of coil inductance also can be different, by observing electricityThe change size of sense detects sample. First electric impedance analyzer (1) produces the low level current of an amplitude 20mA, the model of frequency sweepEnclose for 0-100KHz, signal passes in coil (2), and now electric impedance analyzer (1) can record between a coil inductance and frequencyGraph of a relation, in the time putting into sample in propylene acid tube (3), coil inductance can change, and electric impedance analyzer (1) can obtain again oneGraph of a relation between coil inductance and frequency. Different samples can produce different graphs of a relation. So just can distinguish different samplesProduct.
The invention has the beneficial effects as follows: the outer through mode low frequency electromagnetic checkout gear of described one is not subject to the environmental factor such as time, spaceImpact, convenient and simple for operation. In addition, described device has adopted low frequency signal, can overcome the impact of Kelvin effect, improvesThe detection degree of depth, the inside of sample therefore can be detected, improved the accuracy detecting.
Brief description of the drawings
Fig. 1 is the outer through mode low frequency electromagnetic checkout gear schematic diagram of one of the present invention;
Fig. 2 is the coil inductance frequency response schematic diagram that different liquids of the present invention records;
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the invention will be further described:
Referring to accompanying drawing 1, a kind of outer through mode low frequency electromagnetic checkout gear, by electric impedance analyzer (1), coil (2), propylene acid tube(3) composition; Propylene acid tube (3) is placed in the middle of coil (2), and electric impedance analyzer (1) is connected to coil (2).
The low level current amplitude that electric impedance analyzer (1) produces is 20mA, and the scope of frequency sweep is 0-100KHz, and frequency bandwidth is125Hz, coil (2) adopts the enamel-covered wire coiling that diameter is 0.2mm to form, and the number of turns of coiling is 2672 circles, propylene acid tube (3)Internal diameter is 194mm, and external diameter is 200mm. In the time putting into different liquid samples in propylene acid tube (3), electric impedance analyzer (1) is upper aobviousThe coil inductance of showing is different from the relation of frequency, distinguishes different liquid with this. Fig. 2 is the coil inductance that different liquids recordsFrequency response schematic diagram.
Claims (5)
1. an outer through mode low frequency electromagnetic checkout gear, is characterized in that: by electric impedance analyzer (1), lineCircle (2), propylene acid tube (3) composition; Propylene acid tube (3) is placed in the middle of coil (2), and electric impedance analyzer (1) connectsTo coil (2).
2. the outer through mode low frequency electromagnetic checkout gear of one according to claim 1, is characterized in that:The low level current amplitude of electric impedance analyzer (1) output is 20mA.
3. the outer through mode low frequency electromagnetic checkout gear of one according to claim 1, is characterized in that:The swept frequency range of electric impedance analyzer (1) is 0-100kHz.
4. the outer through mode low frequency electromagnetic checkout gear of one according to claim 1, is characterized in that:The diameter of coil (2) enamel-covered wire used is 0.2mm.
5. the outer through mode low frequency electromagnetic checkout gear of one according to claim 1, is characterized in that:The coiling number of turn of coil (2) is 2672 circles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610160798.5A CN105588873B (en) | 2016-03-18 | 2016-03-18 | A kind of outer through mode low frequency electromagnetic detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610160798.5A CN105588873B (en) | 2016-03-18 | 2016-03-18 | A kind of outer through mode low frequency electromagnetic detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105588873A true CN105588873A (en) | 2016-05-18 |
| CN105588873B CN105588873B (en) | 2019-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610160798.5A Active CN105588873B (en) | 2016-03-18 | 2016-03-18 | A kind of outer through mode low frequency electromagnetic detection device |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1255064A (en) * | 1966-01-11 | 1971-11-24 | Commissariat Energie Atomique | Method of non-destructive eddy-current testing of electrically conductive tubes and corresponding apparatus |
| WO1989008838A1 (en) * | 1988-03-08 | 1989-09-21 | Public Health Laboratory Service Board | Measuring electrical impedance of low conductivity samples |
| US6320393B1 (en) * | 1998-10-20 | 2001-11-20 | Mitsubishi Denki Kabushiki Kaisha | Fluid dielectric constant sensing device and method employing the same |
| CN101266221A (en) * | 2008-04-02 | 2008-09-17 | 罗放明 | Mine slurry grade on-line detection device and detection method |
| CN101776630A (en) * | 2010-03-12 | 2010-07-14 | 清华大学 | Concentration measuring method and device of lithium bromide water solution |
| CN101881838A (en) * | 2010-06-23 | 2010-11-10 | 尹武良 | Electromagnetic sensor based measuring equipment and method of dangerous goods in food |
| CN102680368A (en) * | 2012-05-25 | 2012-09-19 | 西安交通大学 | On-line oil particle sensor based on inductance measurement |
-
2016
- 2016-03-18 CN CN201610160798.5A patent/CN105588873B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1255064A (en) * | 1966-01-11 | 1971-11-24 | Commissariat Energie Atomique | Method of non-destructive eddy-current testing of electrically conductive tubes and corresponding apparatus |
| WO1989008838A1 (en) * | 1988-03-08 | 1989-09-21 | Public Health Laboratory Service Board | Measuring electrical impedance of low conductivity samples |
| US6320393B1 (en) * | 1998-10-20 | 2001-11-20 | Mitsubishi Denki Kabushiki Kaisha | Fluid dielectric constant sensing device and method employing the same |
| CN101266221A (en) * | 2008-04-02 | 2008-09-17 | 罗放明 | Mine slurry grade on-line detection device and detection method |
| CN101776630A (en) * | 2010-03-12 | 2010-07-14 | 清华大学 | Concentration measuring method and device of lithium bromide water solution |
| CN101881838A (en) * | 2010-06-23 | 2010-11-10 | 尹武良 | Electromagnetic sensor based measuring equipment and method of dangerous goods in food |
| CN102680368A (en) * | 2012-05-25 | 2012-09-19 | 西安交通大学 | On-line oil particle sensor based on inductance measurement |
Non-Patent Citations (1)
| Title |
|---|
| 田润连: "非接触型溶液浓度测量装置", 《化工自动化及仪表》 * |
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| CN105588873B (en) | 2019-04-19 |
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Inventor after: Shen Changyu Inventor after: Shen Changyu Shentu Fengying Building Weimin Wang Youqing Inventor after: Lou Weimin Inventor after: Wang Youqing Inventor before: Shentu Fengying Inventor before: Lou Weimin Inventor before: Shen Changyu Inventor before: Wang Youqing |
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