CN103940859B - A kind of method of antiresonant circuit capacitance detecting nonmetallic materials discontinuity - Google Patents
A kind of method of antiresonant circuit capacitance detecting nonmetallic materials discontinuity Download PDFInfo
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- CN103940859B CN103940859B CN201410199777.5A CN201410199777A CN103940859B CN 103940859 B CN103940859 B CN 103940859B CN 201410199777 A CN201410199777 A CN 201410199777A CN 103940859 B CN103940859 B CN 103940859B
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- antiresonant circuit
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Abstract
A kind of method that the invention discloses antiresonant circuit capacitance detecting nonmetallic materials discontinuity, based on electromagnetic principles, adopt the electric capacity in antiresonant circuit device as detection sensor, utilize the characteristic that the resonant frequency causing antiresonant circuit is changed by the media variations between two pole plates of electric capacity, the discontinuity of detection nonmetallic materials, breach the restriction of current lossless etection theory, electromechanical detection method is applied in the discontinuity detecting technique of nonmetallic materials, it easily is automated detection, improve detection efficiency and the accuracy of detection of nonmetallic materials discontinuity.
Description
Art
The present invention relates to a kind of lossless detection method, a kind of method particularly relating to antiresonant circuit capacitance detecting nonmetallic materials discontinuity.
Background technology
For the discontinuity detecting technique of nonmetallic materials, the lossless detection method adopted at present has the detection methods such as acoustics, mechanics, ray.Electromagnetic nondestructive method is currently only used for the discontinuity detecting technique of metal material.Compared with the detection methods such as electromagnetic detection and acoustics, mechanics, ray, have accuracy of detection height, detection speed is fast, easily be automated the advantages such as detection, and wherein resonance circuit has high detection sensitivity.
Summary of the invention
It is an object of the invention to overcome the deficiency of prior art, it is provided that a kind of method of antiresonant circuit capacitance detecting nonmetallic materials discontinuity, based on electromagnetic principles, the discontinuity of the capacitance detecting nonmetallic materials in employing antiresonant circuit device.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method of antiresonant circuit capacitance detecting nonmetallic materials discontinuity, adopt the electric capacity in antiresonant circuit device as the detection sensor of detection nonmetallic materials discontinuity, now, leaving hole or gap between two pole plates of the electric capacity in antiresonant circuit device, tested nonmetallic materials can be passed from the hole between two pole plates or gap；According to capacitance equationC=ε r ε 0 S/dFormula is calculated with antiresonant circuit resonant frequencyf 0 =1/(2π(LC)1/2) it can be seen that the resonant frequency of antiresonant circuitf 0And the relative dielectric constant of medium between the two of electric capacity pole platesε r Relevant, when medium occurs discontinuous, the relative dielectric constant of mediumε r To change, cause the resonant frequency of antiresonant circuitf 0Change, utilize this characteristic of antiresonant circuit, the discontinuity of detection nonmetallic materials；
Detecting step includes demarcating and two parts of actual measurement,
Calibration process is,
A. standard nonmetallic materials are inserted between two pole plates of electric capacity, medium between two pole plates of electric capacity becomes standard nonmetallic materials, described standard nonmetallic materials be have material identical with tested nonmetallic materials and shape without discontinuous intact nonmetallic materials；
B. the driving frequency of the excitation power supply in adjustment antiresonant circuit device, when driving frequency is equal to the resonant frequency of antiresonant circuit, antiresonant circuit generation resonance, the total current of antiresonant circuit reaches minima；
C. record the total current of driving frequency when preserving antiresonant circuit generation resonance and antiresonant circuit, be recorded as demarcation driving frequency respectively and demarcate total current；
Actual measurement process is,
D. tested nonmetallic materials being inserted between two pole plates of electric capacity, the medium between two pole plates of electric capacity becomes tested nonmetallic materials, and the excitation power supply in antiresonant circuit device adopts demarcates driving frequency excitation antiresonant circuit；Now, if antiresonant circuit generation resonance, then illustrate that the resonant frequency of now antiresonant circuit is identical with demarcating driving frequency, the total current of antiresonant circuit is equal to demarcating total current, thus judge that the tested nonmetallic materials between two pole plates of electric capacity are identical with demarcating nonmetallic materials, without discontinuous；If there is not resonance in antiresonant circuit, then illustrate that the resonant frequency of now antiresonant circuit is different from demarcating driving frequency, the total current of antiresonant circuit, more than demarcating total current, thus judges to exist in the tested nonmetallic materials between two pole plates of electric capacity discontinuous.
The invention has the beneficial effects as follows, a kind of method that antiresonant circuit capacitance detecting nonmetallic materials discontinuity is provided, based on electromagnetic principles, the discontinuity of the capacitance detecting nonmetallic materials in employing antiresonant circuit device, breach the restriction of current lossless etection theory, electromechanical detection method is applied in the discontinuity detecting technique of nonmetallic materials, it is easy to accomplish Aulomatizeted Detect, improves detection efficiency and the accuracy of detection of nonmetallic materials discontinuity.
Below in conjunction with embodiment, the present invention is described in further detail, but the method for a kind of antiresonant circuit capacitance detecting nonmetallic materials discontinuity of the present invention is not limited to embodiment.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the schematic diagram of the antiresonant circuit capacitance detecting nonmetallic materials discontinuity of the embodiment of the present invention.
In figure, C. electric capacity, L. inductance coil, R. resistance, V. excitation power supply, the tested nonmetallic materials of A..
Detailed description of the invention
In the embodiment shown in fig. 1, a kind of method of antiresonant circuit capacitance detecting nonmetallic materials discontinuity, adopt the electric capacity C in antiresonant circuit device as the detection sensor of detection nonmetallic materials discontinuity, now, leaving hole or gap between two pole plates of the electric capacity C in antiresonant circuit device, tested nonmetallic materials A can pass from the hole between two pole plates or gap；According to capacitance equationC=ε r ε 0 S/dFormula is calculated with antiresonant circuit resonant frequencyf 0 =1/(2π(LC)1/2) it can be seen that the resonant frequency of antiresonant circuit RLCf 0And the relative dielectric constant of medium between the two of electric capacity pole platesε r Relevant, when medium occurs discontinuous, the relative dielectric constant of mediumε r To change, cause the resonant frequency of antiresonant circuit RLCf 0Change, utilize this characteristic of antiresonant circuit RLC, the discontinuity of detection nonmetallic materials；
Detecting step includes demarcating and two parts of actual measurement,
Calibration process is,
A. standard nonmetallic materials are inserted between two pole plates of electric capacity C, medium between two pole plates of electric capacity C becomes standard nonmetallic materials, described standard nonmetallic materials be have material identical with tested nonmetallic materials A and shape without discontinuous intact nonmetallic materials；
B. the driving frequency of the excitation power supply V in adjustment antiresonant circuit device, when driving frequency is equal to the resonant frequency of antiresonant circuit RLC, there is resonance in antiresonant circuit RLC, the total current of antiresonant circuit RLC reaches minima；
C. record the total current of driving frequency when preserving antiresonant circuit RLC generation resonance and antiresonant circuit RLC, be recorded as demarcation driving frequency and demarcation total current respectively；
Actual measurement process is,
D. tested nonmetallic materials being inserted between two pole plates of electric capacity C, the medium between two pole plates of electric capacity C becomes tested nonmetallic materials A, and the excitation power supply V in antiresonant circuit device adopts and demarcates driving frequency excitation antiresonant circuit RLC；Now, if there is resonance in antiresonant circuit RLC, then illustrate that the resonant frequency of now antiresonant circuit is identical with demarcating driving frequency, the total current of antiresonant circuit RLC is equal to demarcating total current, thus judge that the tested nonmetallic materials A between two pole plates of electric capacity is identical with demarcating nonmetallic materials, without discontinuous；If there is not resonance in antiresonant circuit RLC, then illustrate that the resonant frequency of now antiresonant circuit is different from demarcating driving frequency, the total current of antiresonant circuit RLC, more than demarcating total current, thus exists discontinuous in the tested nonmetallic materials A between two pole plates of judgement electric capacity C.
The method that above-described embodiment is only used for further illustrating a kind of antiresonant circuit capacitance detecting nonmetallic materials discontinuity of the present invention; but invention is not limited to embodiment; every any simple modification, equivalent variations and modification above example made according to the technical spirit of the present invention, each falls within the protection domain of technical solution of the present invention.
Claims (1)
1. the method for an antiresonant circuit capacitance detecting nonmetallic materials discontinuity, it is characterized in that: adopt the electric capacity in antiresonant circuit device as the detection sensor of detection nonmetallic materials discontinuity, now, leaving hole or gap between two pole plates of the electric capacity in antiresonant circuit device, tested nonmetallic materials are passed from the hole between two pole plates or gap；According to capacitance equationC=ε r ε 0 S/dFormula is calculated with antiresonant circuit resonant frequencyf 0 =1/(2π(LC)1/2) it can be seen that the resonant frequency of antiresonant circuitf 0And the relative dielectric constant of medium between the two of electric capacity pole platesε r Relevant, when medium occurs discontinuous, the relative dielectric constant of mediumε r To change, cause the resonant frequency of antiresonant circuitf 0Change, utilize this characteristic of antiresonant circuit, the discontinuity of detection nonmetallic materials；
Detecting step includes demarcating and two parts of actual measurement,
Calibration process is,
A. standard nonmetallic materials are inserted between two pole plates of electric capacity, medium between two pole plates of electric capacity becomes standard nonmetallic materials, described standard nonmetallic materials be have material identical with tested nonmetallic materials and shape without discontinuous intact nonmetallic materials；
B. the driving frequency of the excitation power supply in adjustment antiresonant circuit device, when driving frequency is equal to the resonant frequency of antiresonant circuit, antiresonant circuit generation resonance, the total current of antiresonant circuit reaches minima；
C. record the total current of driving frequency when preserving antiresonant circuit generation resonance and antiresonant circuit, be recorded as demarcation driving frequency respectively and demarcate total current；
Actual measurement process is,
D. tested nonmetallic materials being inserted between two pole plates of electric capacity, the medium between two pole plates of electric capacity becomes tested nonmetallic materials, and the excitation power supply in antiresonant circuit device adopts demarcates driving frequency excitation antiresonant circuit；Now, if antiresonant circuit generation resonance, then illustrate that the resonant frequency of now antiresonant circuit is identical with demarcating driving frequency, the total current of antiresonant circuit is equal to demarcating total current, thus judge that the tested nonmetallic materials between two pole plates of electric capacity are identical with standard nonmetallic materials, without discontinuous；If there is not resonance in antiresonant circuit, then illustrate that the resonant frequency of now antiresonant circuit is different from demarcating driving frequency, the total current of antiresonant circuit, more than demarcating total current, thus judges to exist in the tested nonmetallic materials between two pole plates of electric capacity discontinuous.
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