CN1991294A - Electromechanical detection method of non-metallic material thickness - Google Patents
Electromechanical detection method of non-metallic material thickness Download PDFInfo
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- CN1991294A CN1991294A CN 200510104653 CN200510104653A CN1991294A CN 1991294 A CN1991294 A CN 1991294A CN 200510104653 CN200510104653 CN 200510104653 CN 200510104653 A CN200510104653 A CN 200510104653A CN 1991294 A CN1991294 A CN 1991294A
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Abstract
The invention discloses an electromagnetic detecting method for the thickness of non-metallic material, a metal plate with finite thickness is lain on the back of the detected surface of the non-metallic material with known thickness, the electromagnetic inductive probe with driving winding coil and testing winding coil is closed to the detected surface, the pumping signal is generated by the driving winding coil, the electromagnetic signal obtained by the testing winding coil is processed to get the data corresponding to the known thickness of the non-metallic material, the thickness model of non-metallic material (includes air) is established, in the actual measurement, the thickness of non-metallic material can be detected with the same method by aid of the model. Using the method, the thickness of non-metallic material with any structure can be detected, and it can reach the measuring goal for the thickness of non-metallic material conveniently, speedily and effectively.
Description
Technical field
The present invention relates to a kind of detection method of nonmetallic materials, particularly relate to a kind of nonmetallic materials thickness measuring method of realizing in the electromagnetic detection mode.
Background technology
Nonmetallic materials are a kind of range of application materials very widely, it is widely used in worker, agriculture field, foundation construction field and our daily life, such as timber common in our daily life, plastics, rubber or the like, these nonmetallic materials can be made with the object of definite shape, when needs are known the relative dimensions of these nonmetallic materials objects, such as for the plastic plate of producing, in the time of need knowing the thickness of plate body, will carry out thickness measuring.Common thickness measuring method is to adopt instruments such as oil ga(u)ge slide calliper rule or caliper-gauge to carry out thickness measuring, this thickness measuring mode, and the one, be not easy to operation, particularly be difficult to realize the on-line automaticization detection on the production line; The 2nd, the precision of measuring under certain conditions is accurate inadequately.Certainly, also can adopt hyperacoustic detection mode that the nonmetallic materials object is carried out thickness measuring, still, this ultrasonic thickness test mode one is to need couplant; The 2nd, also powerless for the workpiece of some structure, such as for nonmetallic materials object, adopt the ultrasonic thickness test mode just can't record the thickness of object, because cellular structure can't reflect sound wave with cellular structure.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of electromechanical detection method of non-metallic material thickness is provided, can realize that the nonmetallic materials object (also can be air) to any structure carries out thickness measuring, thereby reach convenient, fast, realize measurement purpose effectively nonmetallic materials object thickness.
The technical solution adopted for the present invention to solve the technical problems is: a kind of electromechanical detection method of non-metallic material thickness of liner sheet metal comprises and demarcates and survey two processes:
In calibration process, it comprises the steps:
A. one of back side liner at the tested surface of the nonmetallic materials body of known thickness has certain thickness sheet metal, and sheet metal is close to the back side of the tested surface of nonmetallic materials body;
The electromagnetic inductive probe that b. will have excitation winding coil and detection winding coil abuts in the surface of the tested surface of nonmetallic materials body, the excitation winding coil is encouraged (according to the difference of detected object thickness by the preset signal that waveform generator sent, can the conversion different frequency signals, to obtain the optimum measurement precision), this pumping signal sees through the nonmetallic materials body and obtains by detecting winding coil at the induced signal that sheet metal produced, and the electromagnetic induction signal output that detects the winding coil acquisition is through amplifying, be processed into and the corresponding data of nonmetallic materials body known thickness by the information process unit that with the computing machine is core behind the phase sensitive detection;
C. constantly change the known thickness of nonmetallic materials body, at one of the back side liner of the tested surface of the nonmetallic materials body of this known thickness sheet metal with step a same thickness, sheet metal is close to the back side of the tested surface of nonmetallic materials body, repeating step b obtain some nonmetallic materials bodies different known thickness the data of a correspondence;
D. by the information process unit of computing machine with the different known thickness institute of the nonmetallic materials body that obtains one to one data processing one-tenth be function relationship between expression variable and the thickness nonmetallic materials body with described data;
In the actual measurement process, it comprises the steps:
E. at one of the back side liner of the tested surface of the tested nonmetallic materials body sheet metal with step a same thickness, sheet metal is close to the back side of the tested surface of tested nonmetallic materials body;
F. abut in the surface of the tested surface of tested nonmetallic materials body with aforementioned electromagnetic inductive probe with excitation winding coil and detection winding coil, the excitation winding coil is encouraged by the preset signal identical with step b that waveform generator sent, this pumping signal sees through tested nonmetallic materials body and is obtained by the detection winding coil at the induced signal that sheet metal produced, and the electromagnetic induction signal output that detects the winding coil acquisition is processed into corresponding with it data by the information process unit that with the computing machine is core behind amplification, phase sensitive detection;
G. by the information process unit of computing machine the data of the described correspondence of preceding step being brought into data is in the function relationship between expression of variable and the thickness nonmetallic materials body, and then obtains the thickness of tested nonmetallic materials body.
Another kind of thickness measuring implementation of the present invention is not adopt the liner sheet metal, but will encourage winding coil and detect winding coil separately, and abuts in the two sides of nonmetallic materials respectively, and implementation is:
A kind of electromechanical detection method of non-metallic material thickness comprises and demarcates and survey two processes:
In calibration process, it comprises the steps:
First electromagnetic inductive probe that a. will be provided with the excitation winding coil abuts in the surface of the tested surface of nonmetallic materials body, the back side that second electromagnetic inductive probe that detects winding coil abuts in the tested surface of nonmetallic materials body will be provided with, the excitation winding coil is encouraged by the preset signal that waveform generator sent, this pumping signal obtains by detecting winding coil after seeing through the nonmetallic materials body, and the electromagnetic induction signal output that detects the winding coil acquisition is through amplifying, be processed into and the corresponding data of nonmetallic materials body known thickness by the information process unit that with the computing machine is core behind the phase sensitive detection;
B. constantly change the known thickness of nonmetallic materials body, the different known thickness institute that repeating step b obtains many nonmetallic materials bodies is data one to one;
C. by the information process unit of computing machine with the different known thickness institute of the nonmetallic materials body that obtains one to one data processing one-tenth be function relationship between expression variable and the thickness nonmetallic materials body with described data;
In the actual measurement process, it comprises the steps:
D. abut in the surface of the tested surface of tested nonmetallic materials body with aforementioned first electromagnetic inductive probe that is provided with the excitation winding coil, the back side that second electromagnetic inductive probe that detects winding coil abuts in the tested surface of tested nonmetallic materials body will be provided with, the excitation winding coil is encouraged by the preset signal identical with step a that waveform generator sent, this pumping signal obtains by detecting winding coil after seeing through the nonmetallic materials body, and the electromagnetic induction signal output that detects the winding coil acquisition is through amplifying, be processed into corresponding with it data by the information process unit that with the computing machine is core behind the phase sensitive detection;
E. by the information process unit of computing machine the data of the described correspondence of preceding step being brought into data is in the function relationship between expression of variable and the thickness nonmetallic materials body, and then obtains the thickness of tested nonmetallic materials body.
The present invention has adopted electromechanical detection method to detect the thickness of nonmetallic materials, and it has easy to use, and the measuring accuracy height is particularly useful for the characteristics such as measurement of small quantity.
It is a kind of lossless detection method that is based upon on the electromagnetic induction principle basis that electromagnetism (eddy current) detects, traditional electromechanical detection method is the thickness measuring that is used for the metal material body, it is near the coil that is connected with alternating current metallic object, set up alternating magnetic field by coil, this alternating magnetic field passes through metallic object, and the electromagnetic induction effect takes place with it, in metallic object, set up eddy current.Eddy current in the metallic object also can produce the magnetic field of controlling oneself, and the effect of eddy current magnetism has changed the power in former magnetic field, and then causes the change of coil voltage and impedance.Metallic object is different with distance between the coil, will have influence on the intensity and the distribution of eddy current, and the variation of eddy current has caused the variation of magnetic test coil voltage and impedance again, according to this variation, just can know the thickness of metallic object indirectly.The present invention is applied to this electromechanical detection method on the thickness measuring of nonmetallic materials body.
The invention has the beneficial effects as follows, owing to adopted one of back side liner to have certain thickness sheet metal at the tested surface of the nonmetallic materials body of known thickness, abut in the surface of the tested surface of nonmetallic materials body by the electromagnetic inductive probe that will have excitation winding coil and detection winding coil, send pumping signal by the excitation winding coil, the electromagnetic induction signal that detects the winding coil acquisition obtains the corresponding data of nonmetallic materials body known thickness after treatment, thereby set up the model of a nonmetallic materials body about thickness, in actual measurement, by means of this model, the sharp thickness that can obtain tested nonmetallic materials body in the same way; Or owing to adopted first electromagnetic inductive probe that will be provided with the excitation winding coil on the surface of the tested surface of the nonmetallic materials body of known thickness to abut in the surface of its tested surface, be provided with the back side that second electromagnetic inductive probe that detects winding coil abuts in its tested surface, send pumping signal by the excitation winding coil, the electromagnetic induction signal that detects the winding coil acquisition obtains the corresponding data of nonmetallic materials body known thickness after treatment, thereby set up the model of a nonmetallic materials body about thickness, in actual measurement, by means of this model, the sharp thickness that can obtain tested nonmetallic materials body in the same way; Utilize said method, can realize the nonmetallic materials object of any structure is carried out thickness measuring, thereby reach convenient, fast, realize measurement purpose effectively nonmetallic materials object thickness.
Embodiment
Below in conjunction with embodiment the present invention is described in further detail; But the electromechanical detection method of a kind of non-metallic material thickness of the present invention is not limited to embodiment.
Embodiment one, the electromechanical detection method of a kind of non-metallic material thickness of the present invention, and the thickness that is used in the synthetic plastic body with honeycombed hole of spherical shell shape detects, and comprises and demarcates and survey two processes:
In calibration process, it comprises the steps:
Step a. has the certain thickness metal arc that matches with spherical shell shape inside surface at one of the inside liner of the synthetic plastic body of the spherical shell shape of known thickness, and the metal arc is close to the inside surface of the synthetic plastic body of spherical shell shape;
Step b. will have the outside surface that the electromagnetic inductive probe that encourages winding coil and detect winding coil abuts in the synthetic plastic body of spherical shell shape, the excitation winding coil is encouraged by the preset signal that waveform generator sent, the synthetic plastic body that this pumping signal sees through spherical shell shape obtains by detecting winding coil at the induced signal that the metal arc is produced, and detects electromagnetic induction signal output that winding coil obtains through amplifying, being processed into corresponding data of synthetic plastic body known thickness with spherical shell shape by the information process unit that with the computing machine is core behind the phase sensitive detection;
Step c constantly changes the known thickness of the synthetic plastic body of spherical shell shape, at one of the inside surface liner of the synthetic plastic body of the spherical shell shape of this known thickness metal arc with step a same thickness, the metal arc is close to the inside surface of the synthetic plastic body of spherical shell shape, and repeating step b obtains the different known thickness institute data one to one of the synthetic plastic body of some spherical shell shapes;
Steps d. by the information process unit of computing machine with the different known thickness institute of the synthetic plastic body of the spherical shell shape that obtains one to one data processing one-tenth be the function relationship between expression of the thickness of variable and synthetic plastic body spherical shell shape with described data;
In the actual measurement process, it comprises the steps:
Step e. is at one of the inside surface liner of the synthetic plastic body with honeycombed hole of the tested spherical shell shape metal arc with step a same thickness, and the metal arc is close to the inside surface of the synthetic plastic body with honeycombed hole of tested spherical shell shape;
Step f. abuts in the outside surface of the synthetic plastic body with honeycombed hole of tested spherical shell shape with aforementioned electromagnetic inductive probe with excitation winding coil and detection winding coil, the excitation winding coil is encouraged by the preset signal identical with step b that waveform generator sent, the synthetic plastic body with honeycombed hole that this pumping signal sees through tested spherical shell shape obtains by detecting winding coil at the induced signal that the metal arc is produced, and the electromagnetic induction signal output that detects the winding coil acquisition is through amplifying, be processed into corresponding with it data by the information process unit that with the computing machine is core behind the phase sensitive detection;
Step g. by the information process unit of computing machine the data of the described correspondence of preceding step being brought into data is in the function relationship between expression of thickness of variable and the synthetic plastic body with honeycombed hole spherical shell shape, and then obtains the thickness of the synthetic plastic body with honeycombed hole of tested spherical shell shape.
Embodiment two, the electromechanical detection method of a kind of non-metallic material thickness of the present invention, and the thickness of the wooden platysome of density detects in being used in, and comprises demarcating and survey two processes:
In calibration process, it comprises the steps:
Step a. has certain thickness sheet metal at one of the back side liner of the tested surface of the nonmetallic materials body of known thickness, and sheet metal is close to the back side of the tested surface of nonmetallic materials body; Nonmetallic materials body wherein can be the wooden platysome of middle density, also can be the Plastic Flat plate body that plastic material is made, or the platysome that forms of other material;
Step b. will have the surface that the electromagnetic inductive probe that encourages winding coil and detect winding coil abuts in the tested surface of nonmetallic materials body, the excitation winding coil is encouraged by the preset signal that waveform generator sent, this pumping signal sees through the nonmetallic materials body and is obtained by the detection winding coil at the induced signal that sheet metal produced, and the electromagnetic induction signal output that detects the winding coil acquisition is processed into and the corresponding data of nonmetallic materials body known thickness by the information process unit that with the computing machine is core behind amplification, phase sensitive detection;
Step c constantly changes the known thickness of nonmetallic materials body, at one of the back side liner of the tested surface of the nonmetallic materials body of this known thickness sheet metal with step a same thickness, sheet metal is close to the back side of the tested surface of nonmetallic materials body, and the different known thickness institute that repeating step b obtains some nonmetallic materials bodies is data one to one;
Steps d. by the information process unit of computing machine with the different known thickness institute of the nonmetallic materials body that obtains one to one data processing one-tenth be function relationship between expression variable and the thickness nonmetallic materials body with described data;
In the actual measurement process, it comprises the steps:
The sheet metal of one of the back side liner of the tested surface of step e. wooden plate body of density in tested and step a same thickness, sheet metal be close to tested in the back side of tested surface of the wooden plate body of density;
Step f. abuts in the surface of the tested surface of the tested middle wooden plate body of density with aforementioned electromagnetic inductive probe with excitation winding coil and detection winding coil, the excitation winding coil is encouraged by the preset signal identical with step b that waveform generator sent, this pumping signal sees through the tested middle wooden plate body of density and is obtained by the detection winding coil at the induced signal that sheet metal produced, and the electromagnetic induction signal that the detection winding coil obtains is exported behind amplification, phase sensitive detection and is processed into corresponding with it data by the information process unit that with the computing machine is core;
Step g. by the information process unit of computing machine the data of the described correspondence of preceding step being brought into data is in the function relationship between expression of variable and the thickness nonmetallic materials body, and then obtain tested in the thickness of the wooden plate body of density.
Embodiment three, the electromechanical detection method of a kind of non-metallic material thickness of the present invention, and the thickness that is used in the plastics plate body detects, and comprises and demarcates and survey two processes:
In calibration process, it comprises the steps:
Step a. will be provided with the surface that first electromagnetic inductive probe that encourages winding coil abuts in the tested surface of nonmetallic materials body, the back side that second electromagnetic inductive probe that detects winding coil abuts in the tested surface of nonmetallic materials body will be provided with, the excitation winding coil is encouraged by the preset signal that waveform generator sent, this pumping signal obtains by detecting winding coil after seeing through the nonmetallic materials body, and the electromagnetic induction signal output that detects the winding coil acquisition is through amplifying, be processed into and the corresponding data of nonmetallic materials body known thickness by the information process unit that with the computing machine is core behind the phase sensitive detection;
Step b. constantly changes the known thickness of nonmetallic materials body, and the different known thickness institute that repeating step b obtains many nonmetallic materials bodies is data one to one;
Step c by the information process unit of computing machine with the different known thickness institute of the nonmetallic materials body that obtains one to one data processing one-tenth be function relationship between expression variable and the thickness nonmetallic materials body with described data;
In the actual measurement process, it comprises the steps:
Steps d. abut in the surface of the tested surface of tested plastics plate body with aforementioned first electromagnetic inductive probe that is provided with the excitation winding coil, the back side that second electromagnetic inductive probe that detects winding coil abuts in the tested surface of tested plastics plate body will be provided with, the excitation winding coil is encouraged by the preset signal identical with step a that waveform generator sent, this pumping signal obtains by detecting winding coil after seeing through the nonmetallic materials body, and the electromagnetic induction signal output that detects the winding coil acquisition is through amplifying, be processed into corresponding with it data by the information process unit that with the computing machine is core behind the phase sensitive detection;
It is in the function relationship between expression of variable and the thickness nonmetallic materials body that step e. is brought the data of the described correspondence of preceding step with data into by the information process unit of computing machine, and then obtains the thickness of tested plastics plate body.
Claims (2)
1. the electromechanical detection method of a non-metallic material thickness is characterized in that: comprise and demarcate and survey two processes:
In calibration process, it comprises the steps:
A. one of back side liner at the tested surface of the nonmetallic materials body of known thickness has certain thickness sheet metal, and sheet metal is close to the back side of the tested surface of nonmetallic materials body;
The electromagnetic inductive probe that b. will have excitation winding coil and detection winding coil abuts in the surface of the tested surface of nonmetallic materials body, the excitation winding coil is encouraged by the preset signal that waveform generator sent, this pumping signal sees through the nonmetallic materials body and is obtained by the detection winding coil at the induced signal that sheet metal produced, and the electromagnetic induction signal output that detects the winding coil acquisition is processed into and the corresponding data of nonmetallic materials body known thickness by the information process unit that with the computing machine is core behind amplification, phase sensitive detection;
C. constantly change the known thickness of nonmetallic materials body, at one of the back side liner of the tested surface of the nonmetallic materials body of this known thickness sheet metal with step a same thickness, sheet metal is close to the back side of the tested surface of nonmetallic materials body, and the different known thickness institute that repeating step b obtains some nonmetallic materials bodies is data one to one;
D. by the information process unit of computing machine with the different known thickness institute of the nonmetallic materials body that obtains one to one data processing one-tenth be function relationship between expression variable and the thickness nonmetallic materials body with described data;
In the actual measurement process, it comprises the steps:
E. at one of the back side liner of the tested surface of the tested nonmetallic materials body sheet metal with step a same thickness, sheet metal is close to the back side of the tested surface of tested nonmetallic materials body;
F. abut in the surface of the tested surface of tested nonmetallic materials body with aforementioned electromagnetic inductive probe with excitation winding coil and detection winding coil, the excitation winding coil is encouraged by the preset signal identical with step b that waveform generator sent, this pumping signal sees through tested nonmetallic materials body and is obtained by the detection winding coil at the induced signal that sheet metal produced, and the electromagnetic induction signal output that detects the winding coil acquisition is processed into corresponding with it data by the information process unit that with the computing machine is core behind amplification, phase sensitive detection;
G. by the information process unit of computing machine the data of the described correspondence of preceding step being brought into data is in the function relationship between expression of variable and the thickness nonmetallic materials body, and then obtains the thickness of tested nonmetallic materials body.
2. the electromechanical detection method of a non-metallic material thickness is characterized in that: comprise and demarcate and survey two processes:
In calibration process, it comprises the steps:
First electromagnetic inductive probe that a. will be provided with the excitation winding coil abuts in the surface of the tested surface of nonmetallic materials body, the back side that second electromagnetic inductive probe that detects winding coil abuts in the tested surface of nonmetallic materials body will be provided with, the excitation winding coil is encouraged by the preset signal that waveform generator sent, this pumping signal obtains by detecting winding coil after seeing through the nonmetallic materials body, and the electromagnetic induction signal output that detects the winding coil acquisition is through amplifying, be processed into and the corresponding data of nonmetallic materials body known thickness by the information process unit that with the computing machine is core behind the phase sensitive detection;
B. constantly change the known thickness of nonmetallic materials body, the different known thickness institute that repeating step b obtains many nonmetallic materials bodies is data one to one;
C. by the information process unit of computing machine with the different known thickness institute of the nonmetallic materials body that obtains one to one data processing one-tenth be function relationship between expression variable and the thickness nonmetallic materials body with described data;
In the actual measurement process, it comprises the steps:
D. abut in the surface of the tested surface of tested nonmetallic materials body with aforementioned first electromagnetic inductive probe that is provided with the excitation winding coil, the back side that second electromagnetic inductive probe that detects winding coil abuts in the tested surface of tested nonmetallic materials body will be provided with, the excitation winding coil is encouraged by the preset signal identical with step a that waveform generator sent, this pumping signal obtains by detecting winding coil after seeing through the nonmetallic materials body, and the electromagnetic induction signal output that detects the winding coil acquisition is through amplifying, be processed into corresponding with it data by the information process unit that with the computing machine is core behind the phase sensitive detection;
E. by the information process unit of computing machine the data of the described correspondence of preceding step being brought into data is in the function relationship between expression of variable and the thickness nonmetallic materials body, and then obtains the thickness of tested nonmetallic materials body.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466998A (en) * | 2015-12-31 | 2016-04-06 | 爱德森（厦门）电子有限公司 | Method for utilizing variable-frequency variable-magnetic field excitation to test hardness property of ferromagnetic material |
| CN106597854A (en) * | 2016-12-28 | 2017-04-26 | 爱德森（厦门）电子有限公司 | Adaptive adjustment servo control device and method for object attitude |
| CN107290426A (en) * | 2017-06-20 | 2017-10-24 | 爱德森（厦门）电子有限公司 | A kind of nonmetallic materials deformation crack detecting method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1037209C (en) * | 1992-08-24 | 1998-01-28 | 冶金工业部钢铁研究总院 | Electromagnetic reflecting thickness instrument |
| JPH06148148A (en) * | 1992-11-13 | 1994-05-27 | Nippon Steel Corp | Ultrasonic attenuation measuring method, and material characteristic evaluating method |
| JP3519806B2 (en) * | 1994-11-29 | 2004-04-19 | 株式会社小野測器 | Thickness discriminator |
| SE517293C2 (en) * | 1999-06-30 | 2002-05-21 | Abb Ab | Method and apparatus for inductive measurement of geometric dimension and electrical property with opposite magnetic fields |
| CN1315652A (en) * | 2000-03-29 | 2001-10-03 | 深圳市华丰科技有限公司 | Nondestructive measuring method of pavement thickness |
| CN1257380C (en) * | 2004-07-30 | 2006-05-24 | 廊坊开发区大地工程检测技术开发有限公司 | Method for measuring thickness of concrete slab |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466998A (en) * | 2015-12-31 | 2016-04-06 | 爱德森（厦门）电子有限公司 | Method for utilizing variable-frequency variable-magnetic field excitation to test hardness property of ferromagnetic material |
| CN105466998B (en) * | 2015-12-31 | 2018-11-06 | 爱德森（厦门）电子有限公司 | A method of utilizing frequency conversion varying magnetic field exciting test Testing of Ferromagnetic Material Hardness characteristic |
| CN106597854A (en) * | 2016-12-28 | 2017-04-26 | 爱德森（厦门）电子有限公司 | Adaptive adjustment servo control device and method for object attitude |
| CN107290426A (en) * | 2017-06-20 | 2017-10-24 | 爱德森（厦门）电子有限公司 | A kind of nonmetallic materials deformation crack detecting method |
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