CN103149440B - Contactless concrete resistivity analyzer - Google Patents
Contactless concrete resistivity analyzer Download PDFInfo
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- CN103149440B CN103149440B CN201310071526.4A CN201310071526A CN103149440B CN 103149440 B CN103149440 B CN 103149440B CN 201310071526 A CN201310071526 A CN 201310071526A CN 103149440 B CN103149440 B CN 103149440B
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Abstract
Contactless concrete resistivity analyzer, it is characterized in that comprising interior work core cylinder and outer work core cylinder, bolt is adopted to be assembled into bivalve tube structure between interior work core cylinder and outer work core cylinder, bivalve tube structure is provided with annular core and amperometric determination instrument, annular core and amperometric determination instrument are respectively around the upper doffing openend of interior work core cylinder and outer work core cylinder, the cylinder inwall of interior work core cylinder and the drum outer wall of outer work core cylinder, the cylinder inwall of outer work core cylinder is provided with inductive coil, inductive coil connects the voltage determination instrument outside outer work core cylinder by wire, the iron core at the drum outer wall position of outer work core cylinder is wound with primary coil, primary coil connects the power supply outside outer work core cylinder by wire.The present invention is based on undesirable mutual electromagnetic inductance principle, bury underground, build and can be used for measuring its resistivity in concrete, be suitable for the change of long-term Real-Time Monitoring concrete resistivity.
Description
Technical field
The present invention relates to a kind of concrete analyzer, particularly contactless concrete resistivity analyzer.
Background technology
Concrete structure engineering is widely used in the fields such as harbour, railway, national defence, industrial and agricultural production and life, but governs its usable range because of problems such as permanance.At present, miscellaneous measuring technology and equipment are applied to concrete NDT aspect; Conventional concrete damnification recognition method is difficult to reflection original position concrete damage state, and Dynamic Non-Destruction Measurement obtains structure in situ concrete truly to damage better approach.Concrete resistivity mensuration is one comparatively new non-destructive testing technology, have simple, fast, cost performance is high and can the advantage such as remote real time monitoring, will become the new technology of a kind of quick detection, on-line monitoring and effective evaluation xoncrete structure performance.Concrete resistivity refers to can not only reflect the ability that unit length concrete obstruction electric current passes through concrete density and micromechanism, also can reflect concrete degree of injury exactly; Concrete resistivity is lower, then corrosion current is easier by concrete, and steel bar corrosion deterioration possibility is larger, therefore measurement concrete resistivity can its resistance to corrosion of effective evaluation and the existing reinforcement corrosion degree of assessment.In addition, measure concrete resistivity for on-line analysis, in real time, accurately and dynamically to monitor its change significant.Conventional concrete resistivity measurement mode can be divided into contact and contactless two classes; Comparatively conventional contact type measurement method is mainly two electrode method and four electrode methods, and nondestructive determination mainly contains ultrasonic method, radar method, acoustic-emission etc.But, still there is deficiency to a certain degree in existing concrete resistivity measurements, main manifestations is traditional sensing techniques and method not only examined environment and condition impact, and because of sampling randomness cause result comparatively unilateral, Site Detection also can cause damages of concrete structures, as two electrode methods cannot eliminate the impact of contact resistance, institute's measuring resistance is concrete material resistance, wire and surveying instrument, wire and electrode, the summation of electrode and concrete contact resistance etc., and the material of contact resistance and electrode, size is relevant, the resistivity of concrete material can not be equivalent to truly, four electrode method can reduce the impact of contact resistance preferably, but electrode fabrication trouble, use DC measurement gained Stability of Resistivity and poor repeatability, its decision confidence is low, alternating current is measured more complicated, and the selection of frequency also has impact to resistivity.By contrast, eyes with non-contact method can eliminate contact resistance preferably, but adopts DC measurement resistance can produce electric capacity and polarization effect, make measured value and actual value error very large; Eyes with non-contact method is only applicable to the research to the cement-based material sample of early stage small size in laboratory at present, and the on-line analysis application of Practical Project is few, and equipment needed thereby is expensive, as AC impedance spectrometry etc.In view of the deficiency of existing concrete determination of resistivity method, be necessary to develop suitable concrete resistivity analyzer.
Summary of the invention
In order to make up existing method of testing and the deficiency of equipment in mensuration concrete resistivity, the invention provides contactless concrete resistivity analyzer.Based on undesirable mutual electromagnetic inductance principle, bury underground, build and can be used for measuring its resistivity in concrete, because it is contactless, non-destructive determination device, compensate for the deficiency of existing concrete determination of resistivity method and equipment.
In order to realize above-mentioned technical purpose, technical scheme of the present invention is, contactless concrete resistivity analyzer, it is characterized in that comprising interior work core cylinder and outer work core cylinder, bolt is adopted to be assembled into bivalve tube structure between interior work core cylinder and outer work core cylinder, bolt is connected with threaded hole on interior work core cylinder by the through hole run through on outer work core cylinder and reaches the parts of fastening bivalve tube structure, bivalve tube structure is provided with annular core and amperometric determination instrument, annular core and amperometric determination instrument are respectively around the upper doffing openend of interior work core cylinder and outer work core cylinder, the cylinder inwall of interior work core cylinder and the drum outer wall of outer work core cylinder, the cylinder inwall of outer work core cylinder is provided with inductive coil, inductive coil connects the voltage determination instrument outside outer work core cylinder by wire, the iron core at the drum outer wall position of outer work core cylinder is wound with primary coil, primary coil connects the power supply outside outer work core cylinder by wire.The present invention is based on undesirable mutual electromagnetic inductance principle, bury underground, build and can be used for measuring its resistivity in concrete, because it is contactless, non-destructive determination device, compensate for the deficiency of existing concrete determination of resistivity method and equipment, there is the advantages such as real-time, accurate, simple to operate, long service life and non-polarized, be suitable for the change of long-term Real-Time Monitoring concrete resistivity.
The present invention is based on undesirable mutual electromagnetic inductance principle, utilize and be wound in iron core primary coil on one side after being powered up, the electromagnetic field changed around it, via the magnetic flux path that iron core provides, the electromagnetic field of change is carried out put on the concrete in the Double-casing between outer work core cylinder and interior work core cylinder, because undesirable mutual electromagnetic inductance makes to produce induced voltage and circular current in concrete, if adopt voltage determination instrument and amperometric determination instrument can record corresponding induced voltage and circular current respectively.During enforcement, described concrete resistivity analyzer need be buried underground, build detected part in concrete; If switch on power, then primary coil will excite parts as whole system, iron core can provide magnetic flux path, concrete between Double-casing and inductive coil are all as secondary coil, utilize voltage determination instrument and amperometric determination instrument to measure circular current in induced voltage in inductive coil and concrete respectively, can concrete resistivity be obtained.
Feature of the present invention is also that interior work core cylinder and outer work core cylinder are concentric tube.
Feature of the present invention is also casting concrete between the cylindrical shell of bivalve.
Feature of the present invention be also inductive coil adopt build or extrusion forming process integrated with in outer work core cylinder.
Feature of the present invention is also that the iron core part employing be in interior work core cylinder is built or extrusion forming process is integrated in interior work core cylinder.
Feature of the present invention is also that described power supply is for providing the power supply of different frequency and strong and weak alternating current, is the electric supply installation of whole system.
Feature of the present invention is also that described voltage tester is high-precision AC voltage tester, and in order to measure the induced voltage that inductive coil produces, its value is also the induced voltage between the cylindrical shell of bivalve in concrete.
Feature of the present invention is also that described amperometric determination instrument is high-precision AC current tester, can measure the circular current produced in the concrete mutual inductance process that bivalve cylindrical shell builds.
Feature of the present invention is also that described iron core is that the very capable magnetic siliconized plate of magnetic conduction is made, and plays and provides magnetic flux path effect.
Feature of the present invention is also that described outer work core cylinder adopts the phenoplast of non-conductive class, polyurethane plastics, epoxy plastics, unsaturated polyester plastic, organic siliconresin and allyl resin and modify polymeric resins class material thereof to make, be that two and half cylindrical shells adopt bolted to become to be integrated, have above half cylindrical shell two or more can the through hole of through bolt.
Feature of the present invention is also that described bolt is the phenoplast of non-conductive class, polyurethane plastics, epoxy plastics, unsaturated polyester plastic, organic siliconresin and allyl resin and modify polymeric resins class material thereof are made, its termination is hexangle type, with external thread on screw rod, outer work core cylinder can be run through, and can utilize and be screwed on interior work core cylinder, play outer work core cylinder and the effect of being fastened as a whole of interior work core cylinder.
Feature of the present invention is also that the phenoplast of the described non-conductive class of interior work core cylinder, polyurethane plastics, epoxy plastics, unsaturated polyester plastic, organic siliconresin and allyl resin and modify polymeric resins class material thereof are made, adopt build or extrusion forming process by iron core and amperometric determination instrument while fix, its surface has hole and hole inside surface has screw thread in order to fastening bolt.
Feature of the present invention is also that described primary coil is enameled wire loop, and it is by wire connecting power and be wound in iron core, with the electromagnetic field that changes, be whole system excite parts.
Feature of the present invention is also that described inductive coil is divided into the enameled wire loop of two sections, the termination of one section is insertion slot type, the termination of another section is corresponding plug-type, inductive coil is used builds or extrusion forming process is integrated in outer work core cylinder, be connected with slot end by the plug of inductive coil during assembling, another two ends connect voltage determination instrument by wire.
Feature of the present invention is also that described outer work core cylinder and interior work core cylinder utilize bolted for bivalve tube structure between the two, therebetween can casting concrete, and this concrete can be used as secondary coil, and the circular current produced in it can utilize amperometric determination instrument namely to record.
The invention has the beneficial effects as follows:
1, the present invention is based on undesirable mutual electromagnetic inductance principle to propose, there is Real-Time Monitoring, measure fast, repeatability is good and construct the advantages such as novel, belong to harmless, contactless concrete resistivity determination techniques, compensate for the deficiency of existing assay method and equipment.
2, this invention removes electrode in the test of traditional resistor rate contact with cement-based material that produced contraction is separated, electrode corrosion, contact resistance, electrode disturb, polarize and the problem such as capacity effect, improve the precision that concrete resistivity is tested.
3, adopt the present invention effectively can get rid of the impact of outside environmental elements on proving installation, varying environment Under Concrete change in resistance can be measured for a long time, its simple structure, be easy to operation.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment of the present invention concrete resistivity analyzer;
Fig. 2 is the outer work core-tube structure sectional view of concrete resistivity analyzer of the present invention;
Fig. 3 is the interior work core-tube structure sectional view of concrete resistivity analyzer of the present invention;
Wherein 1 is power supply, and 2 is voltage tester, and 3 is outer work core cylinder, and 4 is interior work core cylinder, and 5 is bolt, and 6 is primary coil, and 7 is inductive coil, and 8 is amperometric determination instrument, and 9 is wire, and 10 is iron core, 11 threaded holes, 12 through holes.
Embodiment
Embodiment is further illustrating the technology of the present invention content below, but the restriction not to flesh and blood of the present invention.
Concrete resistivity analyzer comprises power supply 1, amperometric determination instrument 8, voltage determination instrument 2, iron core 10, outer work core cylinder 3, wire 9, interior work core cylinder 4, the threaded hole of bolt 5,11,12 through holes, primary coil 6 and inductive coil 7.Concrete resistivity analyzer comprises interior work core cylinder 4 and outer work core cylinder 3, bolt 5 is adopted to be assembled into bivalve tube structure between interior work core cylinder 4 and outer work core cylinder 3, bolt 5 is connected with threaded hole 11 on interior work core cylinder 4 by the through hole 12 run through on outer work core cylinder 3 and reaches the parts of fastening bivalve tube structure, bivalve tube structure is provided with an annular core 10 and an amperometric determination instrument 8, annular core 10 and amperometric determination instrument 8 are respectively around the upper doffing openend of interior work core cylinder 4 and outer work core cylinder 3, the cylinder inwall of interior work core cylinder 4 and the drum outer wall of outer work core cylinder 3, the cylinder inwall of outer work core cylinder 3 is provided with inductive coil 7, inductive coil 7 connects the voltage determination instrument 2 outside outer work core cylinder 3 by wire 9, the iron core 10 at the drum outer wall position of outer work core cylinder 3 is wound with primary coil 6, primary coil 6 connects the power supply 1 outside outer work core cylinder 3 by wire 9.Fig. 1 is the structural representation of embodiment of the present invention concrete resistivity analyzer, as shown in Figure 1, inductive coil 7 connects voltage determination instrument 2 by wire 9, and be used and build or extrusion forming process is integrated in outer work core cylinder 3, primary coil 6 connects power supply 1 by wire 9, and be wound in one side of iron core 10, and one side of the corresponding Symmetry Edge of iron core 10 and amperometric determination instrument 8 is all used and builds or extrusion forming process is integrated in interior work core cylinder 4, outer work core cylinder 3 and interior work core cylinder 4 adopt bolt 5 to be assembled into bivalve tube structure between the two, can casting concrete between this bivalve cylindrical shell.Fig. 2 is the outer work core-tube structure sectional view of concrete resistivity analyzer of the present invention, as shown in Figure 2, outer work core cylinder 3 is that two thin-walled half cylindrical shells adopt that hex bolts 5 is fastening becomes overall, it having two or more through hole 12 run through for bolt 5, building or the inductive coil 7 of extrusion forming process containing adopting in outer work core cylinder 3.Fig. 3 is the interior work core-tube structure sectional view of concrete resistivity analyzer of the present invention, as shown in Figure 3, interior work core cylinder 4 is for having the solid cylindrical shell of certain size, and adopt build or extrusion forming process by one side of iron core 10 and amperometric determination instrument 8 while become one, two or morely on it have threaded hole 11, itself and outer work core cylinder 3 can be assembled into entirety by bolt 5.
Feature of the present invention is also that interior work core cylinder 4 is concentric tube with outer work core cylinder 3.
Feature of the present invention is also casting concrete between the cylindrical shell of bivalve.
Feature of the present invention is also that inductive coil 7 employing is built or extrusion forming process is integrated in outer work core cylinder 3.
Feature of the present invention is also that the iron core 10 part employing be in interior work core cylinder 4 is built or extrusion forming process is integrated in interior work core cylinder.
Feature of the present invention is also that power supply 1 is for providing the power supply of different frequency and strong and weak alternating current, is the electric supply installation of whole system.
Feature of the present invention is also that described voltage tester 2 is high-precision AC voltage tester, and in order to measure the induced voltage that inductive coil 7 produces, its value is also the induced voltage between the cylindrical shell of bivalve in concrete.
Feature of the present invention is also that described amperometric determination instrument 8 is for high-precision AC current tester, can measure the circular current produced in the concrete mutual inductance process that bivalve cylindrical shell builds.
Feature of the present invention is also that described iron core 10 is that the very capable magnetic siliconized plate of magnetic conduction is made, and plays and provides magnetic flux path effect.
Feature of the present invention is also that described outer work core cylinder 3 is the phenoplast of non-conductive class, polyurethane plastics, epoxy plastics, unsaturated polyester plastic, organic siliconresin and allyl resin and modify polymeric resins class material thereof are made, be that two and half cylindrical shells adopt bolts 5 to be tightened to and to be integrated, have above half cylindrical shell two or more can the through hole of through bolt 5.
Feature of the present invention is also that described bolt 5 is the phenoplast of non-conductive class, polyurethane plastics, epoxy plastics, unsaturated polyester plastic, organic siliconresin and allyl resin and modify polymeric resins class material thereof are made, its termination is hexangle type, with external thread on screw rod, outer work core cylinder 3 can be run through, and can utilize and be screwed on interior work core cylinder 4, play outer work core cylinder 3 and the effect of being fastened as a whole of interior work core cylinder 4.
Feature of the present invention is also that described interior work core cylinder 4 is the phenoplast of non-conductive class, polyurethane plastics, epoxy plastics, unsaturated polyester plastic, organic siliconresin and allyl resin and modify polymeric resins class material thereof are made, adopt build or extrusion forming process by iron core 10 and amperometric determination instrument 8 while fix, its surface has hole and hole inside surface has screw thread in order to fastening bolt 5.
Feature of the present invention is also that described primary coil 6 is for enameled wire loop, and it connects power supply 1 by wire 9 and is wound in iron core 10, to change electromagnetic field, be whole system excite parts.
Feature of the present invention is also the described enameled wire loop of inductive coil 7 for being divided into two sections, the termination of one section is insertion slot type, the termination of another section is corresponding plug-type, inductive coil 7 is used builds or extrusion forming process is integrated in outer work core cylinder 3, be connected with slot end by the plug of inductive coil 3 during assembling, another two ends connect voltage determination instrument 2 indirectly to obtain induced voltage by wire 9.
It is bivalve tube structure that feature of the present invention is also that described outer work core cylinder 3 and interior work core cylinder 4 utilize bolt 5 fastening between the two, can casting concrete between this structure, and concrete can play secondary coil effect, the circular current produced can utilize amperometric determination instrument 8 to record.
The present invention is based on electromagnetic induction principle, utilize and be wound in iron core 10 primary coil 6 on one side and switching on power after 1, the electromagnetic field changed around it, via the magnetic flux path that iron core 10 provides, the electromagnetic field of change is carried out put on the concrete in the Double-casing between outer work core cylinder 3 and interior work core cylinder 4, because undesirable mutual electromagnetic inductance makes to produce induced voltage and circular current in concrete, induced voltage and circular current can be recorded according to voltage determination instrument 2 and amperometric determination instrument 8.
During enforcement, described concrete resistivity analyzer need be buried underground, build detected part in concrete; If switch on power 1, then primary coil 6 will as exciting parts, iron core 10 can provide magnetic flux path, concrete between Double-casing and inductive coil 7 are all as secondary coil, voltage determination instrument 2 and amperometric determination instrument 8 is utilized to measure circular current in induced voltage in inductive coil 7 and concrete respectively, concrete resistivity can be obtained, shown in (1).
In formula: U is induced voltage, I is circular current, r
1for the internal diameter of outer work core cylinder, r
0for the external diameter of interior work core cylinder, h is the height of outer work core cylinder.
Claims (13)
1. contactless concrete resistivity analyzer, burying underground, building in concrete for measuring concrete resistivity, it is characterized in that comprising interior work core cylinder and outer work core cylinder, bolt is adopted to be assembled into bivalve tube structure between interior work core cylinder and outer work core cylinder, bolt is connected with threaded hole on interior work core cylinder by the through hole run through on outer work core cylinder and reaches the parts of fastening bivalve tube structure, casting concrete between the cylindrical shell of bivalve; Bivalve tube structure is provided with annular core and amperometric determination instrument, annular core and amperometric determination instrument are respectively around the drum outer wall of interior work core cylinder and the upper doffing openend of outer work core cylinder, the cylinder inwall of interior work core cylinder and outer work core cylinder, the cylinder inwall of outer work core cylinder is provided with inductive coil, inductive coil connects the voltage determination instrument outside outer work core cylinder by wire, the iron core at the drum outer wall position of outer work core cylinder is wound with primary coil, and primary coil connects the power supply outside outer work core cylinder by wire;
Utilize and be wound in iron core primary coil on one side after being powered up, the electromagnetic field changed around it, via the magnetic flux path that iron core provides, the electromagnetic field of change is carried out put on the concrete in the Double-casing between outer work core cylinder and interior work core cylinder, because undesirable mutual electromagnetic inductance makes to produce induced voltage and circular current in concrete, induced voltage and circular current can be recorded according to voltage determination instrument and amperometric determination instrument.
2. contactless concrete resistivity analyzer according to claim 1, is characterized in that, interior work core cylinder and outer work core cylinder are concentric tube.
3. contactless concrete resistivity analyzer according to claim 1, is characterized in that, inductive coil employing is built or extrusion forming process is integrated in outer work core cylinder.
4. contactless concrete resistivity analyzer according to claim 1, is characterized in that, the iron core part employing be in interior work core cylinder is built or extrusion forming process is integrated in interior work core cylinder.
5. the contactless concrete resistivity analyzer according to claim arbitrary in Claims 1-4, is characterized in that, described power supply is for providing the power supply of different frequency and strong and weak alternating current.
6. the contactless concrete resistivity analyzer according to claim arbitrary in Claims 1-4, is characterized in that, described voltage tester is high-precision AC voltage tester, in order to measure the induced voltage in inductive coil.
7. the contactless concrete resistivity analyzer according to claim arbitrary in Claims 1-4, it is characterized in that, described amperometric determination instrument is high-precision AC current tester, can measure the circular current that between the cylindrical shell of bivalve, concrete produces in undesirable mutual electromagnetic inductance process.
8. the contactless concrete resistivity analyzer according to claim arbitrary in Claims 1-4, is characterized in that, described iron core is the very capable magnetic siliconized plate of magnetic conduction.
9. the contactless concrete resistivity analyzer according to claim arbitrary in Claims 1-4, it is characterized in that, described outer work core cylinder adopts the phenoplast of non-conductive class, polyurethane plastics, epoxy plastics, unsaturated polyester plastic, organic siliconresin or allyl resin are made, or adopt the phenoplast of non-conductive class, polyurethane plastics, epoxy plastics, unsaturated polyester plastic, the modify polymeric resins class material of organic siliconresin or allyl resin is made, outer work core cylinder is two and half cylindrical shells, half cylindrical shell has two or more can the through hole of through bolt, the outer work core cylinder that two and half cylindrical shells adopt bolted to become to be integrated.
10. the contactless concrete resistivity analyzer according to claim arbitrary in Claims 1-4, it is characterized in that, described bolt adopts the phenoplast of non-conductive class, polyurethane plastics, epoxy plastics, unsaturated polyester plastic, organic siliconresin or allyl resin are made, or adopt the phenoplast of non-conductive class, polyurethane plastics, epoxy plastics, unsaturated polyester plastic, the modify polymeric resins class material of organic siliconresin or allyl resin is made, bolt end is hexangle type, screw rod is threaded outward, outer work core cylinder can be run through, and the utilization of outer work core cylinder is screwed on interior work core cylinder, play outer work core cylinder and the effect of being assembled into one of interior work core cylinder.
11. contactless concrete resistivity analyzers according to claim arbitrary in Claims 1-4, it is characterized in that, described interior work core cylinder adopts the phenoplast of non-conductive class, polyurethane plastics, epoxy plastics, unsaturated polyester plastic, organic siliconresin or allyl resin are made, or adopt the phenoplast of non-conductive class, polyurethane plastics, epoxy plastics, unsaturated polyester plastic, the modify polymeric resins class material of organic siliconresin or allyl resin is made, interior work core cylinder adopt build or extrusion forming process by iron core and amperometric determination instrument while fix, interior work core cylinder surface has hole containing screw thread with fastening bolt.
12. contactless concrete resistivity analyzers according to claim arbitrary in Claims 1-4, it is characterized in that, described primary coil is enameled wire loop, primary coil is by wire connecting power and be wound in iron core on one side, with the electromagnetic field that changes, be whole system excite parts.
13. contactless concrete resistivity analyzers according to claim arbitrary in Claims 1-4, it is characterized in that, described inductive coil is divided into the enameled wire loop of two sections, the termination, one end of one section is insertion slot type, the termination, one end of another section is corresponding plug-type, inductive coil employing is built or extrusion forming process is integrated in outer work core cylinder, be connected with slot end by the plug of inductive coil during assembling, the another two ends of two sections of enameled wire loops connect voltage determination instrument respectively by wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310071526.4A CN103149440B (en) | 2013-03-06 | 2013-03-06 | Contactless concrete resistivity analyzer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310071526.4A CN103149440B (en) | 2013-03-06 | 2013-03-06 | Contactless concrete resistivity analyzer |
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| CN103149440A CN103149440A (en) | 2013-06-12 |
| CN103149440B true CN103149440B (en) | 2015-11-25 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107860977A (en) * | 2017-11-03 | 2018-03-30 | 哈尔滨工业大学 | A kind of concrete, mortar resistivity sensor |
| CN110187183A (en) * | 2019-05-24 | 2019-08-30 | 太原理工大学 | Contactless original state Polluted Soil resistivity measurement device and method |
| CN111562441B (en) * | 2020-05-21 | 2023-05-02 | 太原理工大学 | Non-contact original contaminated soil alternating current impedance spectrum testing device and method |
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| US3068380A (en) * | 1959-06-01 | 1962-12-11 | Ibm | Magnetic core testing device |
| US5855721A (en) * | 1997-03-11 | 1999-01-05 | The Regents Of The University Of California | Non-destructive method of determining the position and condition of reinforcing steel in concrete |
| CN1399130A (en) * | 2001-07-19 | 2003-02-26 | 香港科技大学 | Device and method for measuring sample resistivity |
| CN102539928A (en) * | 2010-12-21 | 2012-07-04 | 香港科技大学 | Pore structure analyzer based on non-contact impedance measurement for cement-based materials |
| CN203133174U (en) * | 2013-03-06 | 2013-08-14 | 中南大学 | Non-contact concrete resistivity tester |
-
2013
- 2013-03-06 CN CN201310071526.4A patent/CN103149440B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3068380A (en) * | 1959-06-01 | 1962-12-11 | Ibm | Magnetic core testing device |
| US5855721A (en) * | 1997-03-11 | 1999-01-05 | The Regents Of The University Of California | Non-destructive method of determining the position and condition of reinforcing steel in concrete |
| CN1399130A (en) * | 2001-07-19 | 2003-02-26 | 香港科技大学 | Device and method for measuring sample resistivity |
| CN102539928A (en) * | 2010-12-21 | 2012-07-04 | 香港科技大学 | Pore structure analyzer based on non-contact impedance measurement for cement-based materials |
| CN203133174U (en) * | 2013-03-06 | 2013-08-14 | 中南大学 | Non-contact concrete resistivity tester |
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