CN85103661B - Apparatus for measuring the concentration of magnetic suspended fluid - Google Patents
Apparatus for measuring the concentration of magnetic suspended fluidInfo
- Publication number
- CN85103661B CN85103661B CN85103661A CN85103661A CN85103661B CN 85103661 B CN85103661 B CN 85103661B CN 85103661 A CN85103661 A CN 85103661A CN 85103661 A CN85103661 A CN 85103661A CN 85103661 B CN85103661 B CN 85103661B
- Authority
- CN
- China
- Prior art keywords
- alternating current
- sensors
- magnetic
- mutual inductance
- arms
- 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.)
- Expired
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The present invention relates to a device for measuring magnetic suspension concentration. The present invention is relevant to the method research or the material analysis of magnetic application. If the present invention is used in magnetic powder flaw detection, the concentration or the magnetic characteristic of the applied magnetic suspension is measured. Two identical mutual induction type sensors are used, wherein a glass pipe for measured magnetic suspension can flow is arranged in one sensor, the other sensor is used for compensation, and the two sensors are formed into two arms of a transformer bridge, and other two arms of the transformer bridge are resistors. The transformer bridge is energized by a power supply with a stable frequency and stable amplitude. The device has the advantage of high sensitivity and is used for the quick and continuous measurement of the magnetic suspension with low concentration in magnetic powder flae detection.
Description
The present invention is relevant with method research or the analysis of material of using magnetic, as being used for magnetic powder inspection, measures concentration or its magnetic characteristic of applied magnetic flaw detection ink.
Used magnetic flaw detection ink is to add an amount of magnetic to form in a certain amount of liquid in magnetic powder inspection, and its concentration range is 1-30g/l.The magnetic characteristic of utilizing magnetic flaw detection ink externally to show can be measured its concentration.As propose alternating current bridge method Particle content determinator with Publication about Document: R.Rabinovici and V.Badescu, " A simple device for concentration measurements of the magnetic material in ferrofluids ", Revue Roumaine de Physique.Vol.22, no.8, PP.891-892,1977 adopt self-inductance sensor as an arm of alternating current bridge, the tested magnetic flaw detection ink of internal circulation.With the identical self-induction of another parameter another arm as alternating current bridge, in addition two arms of alternating current bridge are resistance.Tested Particle content changes the variation that converts the sensor self-inductance to, converts the variation of alternating current bridge output voltage to again, again through amplify and detuner to recorder.Though the quick and METHOD FOR CONTINUOUS DETERMINATION of this device energy also is convenient to the outfield operation, disadvantage is that sensitivity is low.
The present invention is the improvement of doing for above-mentioned shortcoming, finishes the mensuration of magnetic powder inspection middle-low concentration magnetic suspension liquid.
Accompanying drawing one is the electrical schematic diagram of Particle content determinator.(1) is test mutual inductance sensor, the compensation mutual inductance sensor that (2) are structure, size is as far as possible identical with parameter among the figure.Two mutual inductance sensor auxiliary winding homophases compose in series alternating current bridge two bridges two arms mutually.Alternating current bridge in addition two arms is made up of resistance (3), (4) and balanced potentiometer (5).(6) be little electric capacity balancing capacitor.Connect to excitation power supply (7) after two mutual inductance sensor primary winding homophases are connected in series mutually, excitation power supply (7) is the power supply through frequency stabilization and fixed ampllitude.
Above each several part forms the transformer bridges form.Electric bridge output is arrived recorder (10) through frequency-selecting amplifier (8) and detuner (9).
Accompanying drawing two is structural drawing of the used mutual inductance sensor of the present invention.(11) are primary winding among the figure, and (12) are auxiliary winding, and the auxiliary winding number of turn is greater than the primary winding number of turn.(13) be the framework of former auxiliary winding.(14) shield between former auxiliary winding.(15) for consisting of the iron-clad of magnetic circuit.(16) be the glass tube of tested magnetic flaw detection ink circulation.
Main points of the present invention also are that the magnetic characteristic of utilizing magnetic flaw detection ink externally to show is measured its concentration, but adopt the transformer bridges form in the alternating current bridge.Test is with putting glass tube in the mutual inductance sensor, near compensation is placed in mutual inductance sensor on the symmetric position.Before magnetic flaw detection ink flows into glass tube, regulate balanced potentiometer and the balancing capacitor of electric bridge, making electric bridge output fundametal compoment is zero, eliminates because two asymmetric generations of mutual inductance sensor " leaking output " with this.Among the figure one balancing capacitor also may with balanced potentiometer bottom Xiang Bingjie, counterbalance effect is best.When magnetic flaw detection ink circulated from glass tube, test changing with the mutual inductance sensor parameter, and the fundametal compoment existence of reflection Particle content is just arranged in the electric bridge output, through frequency-selecting amplifier and detuner to recorder.Can prove that the reading of a recording instrument and concentration are linear in Particle content scope (1-30g/l) is used in flaw detection.The magnetic flaw detection ink externally magnetic characteristic of performance can represent that with an equivalent permeability reading of a recording instrument is also linear with this equivalence magnetic permeability.Because this device is to utilize the magnetic characteristic of magnetic flaw detection ink to finish its concentration determination, so the conductivity of non-magnetic impurity and magnetic flaw detection ink there is not impact to measurement result in the magnetic flaw detection ink.
Implementing best way of the present invention is:
(1) be the eddy current loss of reduction magnetic flaw detection ink and the impact of mutual inductance sensor distribution parameter, the excitation power supply frequency is taken in the bass scope, is not higher than 1 kilo hertz.For reducing the requirement to frequency-selecting amplifier in the electric bridge detection system etc., the peak-to-peak value of excitation power supply is suitably got higher values, is not less than 30 volts.
(2) excitation power supply adopt amplitude and frequency stability be better than ten thousand/ sine or non-sinusoidal power supply.
(3) the mutual inductance sensor auxiliary winding number of turn is greater than the primary winding number of turn.Primary winding is around internal layer, as close as possible glass tube.Desirable 1,000 circles of the primary winding number of turn, desirable 10,000 circles of the auxiliary winding number of turn.Add shielding between former auxiliary winding.
(4) for reducing the degree of saturation of iron-clad in the mutual inductance sensor, iron-clad thickness is not less than 2 millimeters.
(5) the glass tube internal diameter is approximately greater than 48 millimeters in the mutual inductance sensor, and wall thickness is not more than 3 millimeters, and glass tube length is not less than 5 times of its internal diameters.
(6) but the active bandpass amplifier of frequency-selecting amplifier high input impedance.
(7) demodulator circuit can be used ring demodulator, and its sampled signal is provided by excitation power supply.
Claims (5)
1, a kind of magnetic powder inspection Particle content determinator adopts two identical sensors, the tested magnetic flaw detection ink of internal circulation, another does compensation, two sensors form two arms of alternating current bridges, and two arms are resistance in addition, electric bridge output through amplifier and detuner to recorder.Feature of the present invention is: two sensors adopt mutual inductance sensor (1), (2), two mutual inductance sensors (1) (2) auxiliary winding composes in series two arms of alternating current bridge mutually, after being connected in series mutually, two mutual inductance sensors (1) (2) primary winding connects to excitation power supply (7), alternating current bridge in addition two arms is resistance (3) (4) and balanced potentiometer (5), and the alternating current bridge that forms is the transformer bridges form.
2, determinator as described in claim 1, wherein the auxiliary winding number of turn of two mutual inductance sensors is greater than the primary winding number of turn, primary winding is around internal layer, glass tube (16) near interior logical magnetic flaw detection ink, adopt balanced potentiometer (5) and balancing capacitor (6), eliminate the asymmetric of two mutual inductance sensors.
3, determinator as claimed in claim 1 or 2, alternating current bridge excitation power supply (7) adopt the power supply through fixed ampllitude, frequency stabilization, and amplitude and frequency stability be better than ten thousand/, the excitation power supply frequency is below 1 kilo hertz.
4, determinator as claimed in claim 1 or 2, the alternating current bridge output voltage enters detuner again through frequency-selecting amplifier.
5, determinator as claimed in claim 3, the alternating current bridge output voltage enters detuner again through frequency-selecting amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85103661A CN85103661B (en) | 1985-05-18 | 1985-05-18 | Apparatus for measuring the concentration of magnetic suspended fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85103661A CN85103661B (en) | 1985-05-18 | 1985-05-18 | Apparatus for measuring the concentration of magnetic suspended fluid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85103661A CN85103661A (en) | 1986-04-10 |
| CN85103661B true CN85103661B (en) | 1987-05-27 |
Family
ID=4793351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85103661A Expired CN85103661B (en) | 1985-05-18 | 1985-05-18 | Apparatus for measuring the concentration of magnetic suspended fluid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85103661B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100451643C (en) * | 2005-07-15 | 2009-01-14 | 曾德文 | Magnetic powder concentration sensor for magnetic suspension |
| CN101963570B (en) * | 2010-05-17 | 2012-08-01 | 深圳市亚泰光电技术有限公司 | Device for rapidly detecting ferromagnetic grain in lubricating oil, detection method and signal processing circuit |
| CN102830156A (en) * | 2012-08-31 | 2012-12-19 | 爱德森（厦门）电子有限公司 | On-line dynamic real-time monitoring method and apparatus for magnetic suspension concentration |
| CN103335926B (en) * | 2013-06-27 | 2015-04-22 | 南车戚墅堰机车车辆工艺研究所有限公司 | Method for measuring concentration of magnetic suspension for magnetic powder inspection |
| CN105527337A (en) * | 2014-09-28 | 2016-04-27 | 宝山钢铁股份有限公司 | Measurement apparatus and measurement method for magnetic suspension concentration |
| CN106872915B (en) * | 2017-01-11 | 2019-09-13 | 中车戚墅堰机车车辆工艺研究所有限公司 | Particle content monitoring method during flaw detection |
| CN117824771B (en) * | 2024-03-06 | 2024-06-04 | 成都睿宝电子科技有限公司 | Automatic temperature compensation circuit and compensation method for thermal flowmeter |
-
1985
- 1985-05-18 CN CN85103661A patent/CN85103661B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85103661A (en) | 1986-04-10 |
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| C06 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yu Lunyuan Inventor after: Cao Junzheng Inventor before: Yu Lunyuan |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: YU LUNYUAN TO: YU LUNYUAN; CAO JUNZHENG |