CN105974205A - Coaxial one-dimensional reinforced concrete member concrete dielectric constant measuring device and method - Google Patents
Coaxial one-dimensional reinforced concrete member concrete dielectric constant measuring device and method Download PDFInfo
- Publication number
- CN105974205A CN105974205A CN201610587573.8A CN201610587573A CN105974205A CN 105974205 A CN105974205 A CN 105974205A CN 201610587573 A CN201610587573 A CN 201610587573A CN 105974205 A CN105974205 A CN 105974205A
- Authority
- CN
- China
- Prior art keywords
- equal
- coaxial
- reinforced concrete
- concrete member
- outer conductor
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2617—Measuring dielectric properties, e.g. constants
- G01R27/2623—Measuring-systems or electronic circuits
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention provides a coaxial one-dimensional reinforced concrete member concrete dielectric constant measuring device and method. Steel bars in a coaxial one-dimensional reinforced concrete member are of a coaxial cable structure; and inner and outer conductors are formed by a plurality of longitudinal bars and hoops. The dielectric constant measuring device comprises a control server, a microprocessor, a signal source, a power divider and a measurement connecting port and the like. The control server is communicated with the microprocessor through a communication interface, and is used for controlling measurement of a coaxial one-dimensional reinforced concrete member to be measured. The measuring process comprises a control server program flow and a microprocessor program flow. The dielectric constant value of the reinforced concrete member is obtained according to a parameter calculation subprogram of the microprocessor program flow. By measuring change of the dielectric constant of the concrete, health state of the concrete is monitored. On the basis of not changing concrete materials and design method, the concrete material is a kind of sensing material, and the health state of the concrete member is monitored in real time according to the measured concrete dielectric constant.
Description
(1) technical field
The invention belongs to construction material detection category, relate to concrete quality monitoring, the most coaxial one-dimensional reinforced concrete member mixes
Solidifying soil dielectric constant measurement equipment and measuring method.
(2) background technology
Concrete is the most widely used structural material in civil engineering structure, and the damage of concrete structure material can seriously be broken
The globality of bad structure, affect the durability of structure, the most directly endanger the safety of engineering structure, therefore, concrete material
Material damage check or monitoring are the important contents of construction quality inspection and monitoring structural health conditions.Concrete component is had in real time
Effect detection and in real time monitoring, scientifically grasp the dynamic change of concrete component structural behaviour, arrange to taking diaster prevention and control in time
The efficiency of operation executing, improving structure, the sustainable Green Development realizing xoncrete structure Life cycle, guarantee people's life
Property safety has earth shaking meaning.
Under the situation that society develops rapidly, the quality testing of various concrete has had raising in various degree.The patent No.
ZL201520402418.5 " reinforcing bar coaxial cable structure one-dimensional concrete health monitoring step test ", gives a kind of to steel
The health monitor method of the one-dimensional concrete of muscle coaxial cable structure, but no matter measuring accuracy or reliability, stability also have
Wait to improve.
Patent No. ZL201310029782.7 " the concrete monitor and detection instrument with reinforcing bar as electrode and monitor and detection method thereof "
Utilize reinforcing bar to do electrode, detect the electrical quantity between two reinforcing bar electrodes, it is judged that distress in concrete.This law is bright proposes one
Method, but the different structure not according to armored concrete provides different method of testings.
Patent No. ZL201210199249.0 " concrete crack detector with reinforcing bar as electrode ", utilizes emission electrode to swash
Encourage the relation between signal and the response signal receiving electrode, it is judged that distress in concrete.Primary limitation of the present invention is at detection coagulation
The crack of soil, does not detect other Deviant Behavior, there is limitation.
(3) summary of the invention
It is an object of the invention to provide one and vary without concrete material and method for designing, concrete component self is become one
Plant sensing material, under different larval instar, different health status, present differing dielectric constant according to concrete material, use base
The dielectric constant of concrete component is detected by the method in frequency domain reflection, the health status in monitoring concrete each stage.
It is an object of the invention to so to reach: concrete dielectric constant measurement equipment and tested coaxial one-dimensional armored concrete
The inner and outer conductor of component completes to measure jointly.Reinforcing bar in coaxial one-dimensional reinforced concrete member is coaxial cable structure, has
Outer conductor and inner wire, outer conductor combines by some stirrups, vertical muscle with inner wire, and vertical muscle mixes along coaxial one-dimensional reinforcing bar
Solidifying soil component axial distribution, stirrup is distributed along cross-sectional direction, inner wire be positioned at the center within reinforced concrete member,
But dimension of hoop reinforcement consistent with outer conductor shape is less than outer conductor, and outer conductor is positioned at the outside of concrete component, and meets one-dimensional mixed
The requirement of solidifying soil component design specification.
Concrete dielectric constant measurement equipment by control server, microprocessor, signal source, power splitter, signal amplifier,
Measure connectivity port and directional coupler, reflected signal process circuit, frequency mixer, mixed frequency signal process circuit, analog digital conversion
Circuit and programmable attenuator composition.Microprocessor is connected on control server by communication interface.
Concrete dielectric constant measurement equipment is connected to connect on cable, the measurement end of tested coaxial one-dimensional reinforced concrete member
Inner and outer conductor be connected cable inner and outer conductor be connected, the outer conductor of tested coaxial one-dimensional reinforced concrete member be connected
Cable outer conductor connects, and the inner wire of tested coaxial one-dimensional reinforced concrete member connects with being connected cable inner conductor.
Microprocessor connecting signal source, programmable attenuator and analog to digital conversion circuit, the signal input power splitter of signal source, merit is divided
Signal source signal is divided into two-way by device, and frequency mixer is delivered on a road, and signal amplifier group is sent on a road and programmable attenuator group connects
Circuit；The output signal of the circuit that signal amplifier group and programmable attenuator group connect is connected to directional coupler, orients coupling
Input signal is given measurement connectivity port by clutch, and receives reflected signal from measuring connectivity port, the measurement received is connected
The reflected signal connecing port gives reflected signal process circuit, and reflected signal processes the output signal of circuit and is connected to frequency mixer；
The output signal of frequency mixer is sent into mixed frequency signal and is processed circuit, and mixed frequency signal processes circuit output and sends into analog to digital conversion circuit, mould
Microprocessor is given in the output of number conversion circuit.It is equal that the inner and outer conductor of tested coaxial one-dimensional reinforced concrete member indulges muscle quantity
Not less than 6.
Coaxial one-dimensional reinforced concrete member cross section is circular or oval or square or rectangular.
Use concrete dielectric constant measurement equipment that tested coaxial one-dimensional reinforced concrete member is measured；Before measuring,
The inner and outer conductor that tested one-dimensional reinforced concrete member measures end being connected with being connected cable inner and outer conductor, connecting cable is
Coaxial cable；The outer conductor of tested coaxial one-dimensional reinforced concrete member connects with being connected cable outer conductor, tested the most one-dimensional
The inner wire of reinforced concrete member connects with being connected cable inner conductor；The measurement of concrete dielectric constant measurement equipment connects end
Mouth connects with being connected cable.
Control server in concrete dielectric constant measurement equipment is by the communication with microprocessor, to tested coaxial one-dimensional steel
The measurement of reinforced concrete component is controlled, and controls server and microprocessor is assigned control command, arrange measurement parameter, with
Time microprocessor measurement result is sent to control server.
The measurement procedure of tested coaxial one-dimensional reinforced concrete member is included controlling service by concrete dielectric constant measurement equipment
Device program circuit and microprocessor program flow process；Microprocessor program flow process includes microprocessor mastery routine, intervalometer A
Interrupt routine, intervalometer B interrupt routine, parameter computation program.
Control server program flow process:
The first step: sending to microprocessor and arrange systematic parameter order, the systematic parameter sent includes: analog digital conversion
Sample frequency Fadc, signal source low-limit frequency Flow, signal source highest frequency Fhigh, signal source stepping number of times Cstep,
Signal source stepping time interval Tstep, detected concrete component length L, programmable attenuator attenuation parameter, enter the
Two steps；
Second step: receive microprocessor measurement data, returns the first step.
Microprocessor mastery routine:
The first step, receives and controls the control parameter command that server sends, and performs to control the parameter life that server sends
Order, makes array length to be Dmax, Dmax is multiplied by signal source stepping number of times Cstep equal to sample frequency Fadc and be multiplied by letter
Stepping time interval, number source Tstep:Dmax=Fadc × Cstep × Tstep；Definition analog to digital conversion circuit data storage
Array, represents with DATAadc, and array length is Dmax, enters second step；
Second step, arranging the timing of intervalometer A is 1 divided by sample frequency Fadc；Determining of intervalometer B is set
Time the time be Tstep, enter the 3rd step；
3rd step, arranges the value of following variable, enters to count CntStep equal to 0；Signal frequency Fsignal is equal to
Flow；Frequency counting Fcnt is equal to 0；Data subscript Idata is equal to 0；Calculation flag Fcal is equal to 0, arranges
Step frequency Fstep deducts Flow equal to Fhigh, and it is poor divided by Cstep:Fstep=(Fhigh-Flow)/Cstep,
Enter the 4th step；
4th step, arranging signal source frequency is Fsignal, enters the 5th step；
5th step, arranges intervalometer A and produces interruption when arriving timing, arranges to call when intervalometer A interrupts and determines
Time device A interrupt routine；Intervalometer B is set and produces interruption when arriving timing, arrange when intervalometer B interrupts and adjust
With intervalometer B interrupt routine, enter the 6th step；
6th step, it is judged that whether Fcal is equal to 1？If equal to 1, then entering the 7th step, if being not equal to 1, returning
Return the 6th step；
7th step, arranges Fcal equal to 0, and parameter result of calculation is given control clothes by call parameters counting subroutine
Business device, returns the 6th step.
Intervalometer A interrupt routine in microprocessor program flow process:
The first step: gather analog-digital converter data, analog-digital converter data are stored DATAadc [Idata], order
Idata is equal to Idata+1, enters second step；
Second step: judge that whether CntStep is equal to 0？If CntStep is equal to 0, then enter the 3rd step, if
CntStep is not equal to 0, then make Fcnt be equal to 1, and the interrupt routine that stop timing device A produces；
3rd step, it is judged that whether Fcnt is equal to 1？If equal to 1, then enter the 4th step, if being not equal to 1, then
The interrupt routine that stop timing device A produces；
4th step, makes Fcnt be equal to 0；Idata is made to be equal to 0；Make Fcal be equal to 1, and stop timing device A produces
Raw interrupt routine；
Intervalometer B interrupt routine in described microprocessor program flow process:
The first step arranges Fsignal and adds Fstep:Fsignal=Fsignal+Fstep equal to Fsignal；Arrange
CntStep adds 1:CntStep=CntStep+1 equal to CntStep, enters second step；
Second step, arranging signal source frequency is Fsignal, enters the 3rd step；
3rd step, it is judged that whether CntStep is equal to Cstep？If equal, enter the 4th step, if unequal,
Interrupt routine terminates；
4th step, arranges CntStep and is equal to 0, arranges Fsignal and is equal to Flow, and interrupt routine terminates；
Described parameter computation program:
The first step: array DATAadc is carried out fast Fourier transform, if fast Fourier transform result is number
Group FFTadc, enters second step；
Second step: search FFTadc maximum, if being designated as Index under at array FFTadc maximum.Enter the
Three steps；
3rd step: measured electromagnetic signal transmission speed V represents, if A is equal to Dmax-1 equal to Index-1, B,
C deducts Flow, D equal to Fhigh and deducts E, V divided by C, F equal to D equal to Cstep divided by C, E equal to 1
It is multiplied by L divided by A equal to B, then divided by F, can be formulated as: V=BL/ (AF)；Dielectric constant is equal to
Permittivity of vacuum be multiplied by light spread speed in a vacuum square divided by V square, be formulated as:
ε0(light spread speed/V in a vacuum)2；ε0Represent permittivity of vacuum, ε0=8.854187817 ×
10-12(F/m).Return mastery routine.
The vertical muscle quantity of the inner and outer conductor of tested coaxial one-dimensional reinforced concrete member 7 is not less than 6；
Tested coaxial one-dimensional reinforced concrete member inner wire need to meet following requirement:
If concrete dielectric constant is ε, make k=0.36, or 0.54, make x=k ε0.5, k is internal diameter design factor, x
For internal diameter gauge index.
Coaxial one-dimensional reinforced concrete member is respectively circular, oval, square, rectangle according to cross section, orders respectively
The one-dimensional reinforced concrete member of entitled circular coaxial, oval coaxial one-dimensional reinforced concrete member, the coaxial one-dimensional steel of square
The coaxial one-dimensional reinforced concrete member of reinforced concrete component, rectangle.
Reinforced concrete member one-dimensional for circular coaxial, the external diameter r of inner wire is equal to the internal diameter R of outer conductor divided by 10
X power, it may be assumed that r=R/10x,
One-dimensional reinforced concrete member coaxial for ellipse, if the major axis of outer conductor is A, short axle is B, inner wire major axis
For a, short axle is b, then a is equal to the x power that A is divided by 10, and b is equal to the x power that B is divided by 10,
That is: a=A/10x；B=B/10x
One-dimensional reinforced concrete member coaxial for square, if the length of side of outer conductor is LN, the inner wire length of side is l；Then
L is equal to the x power that LN is divided by 10,
That is: l=LN/10x
One-dimensional reinforced concrete member coaxial for rectangle, if a length of Y of outer conductor, a width of W, a length of y of inner wire,
A width of w, then y is equal to the x power that Y is divided by 10, and w is equal to the x power that W is divided by 10
That is: y=Y/10x；W=W/10x。
If concrete dielectric constant is ε, make k=0.36, or 0.54, make x=k ε0.5,
As k=0.36, the connection cable of the inner and outer conductor connection that tested coaxial one-dimensional reinforced concrete member measures end is adopted
Use 50 ohm coaxial cable；
As k=0.54, the connection cable of the inner and outer conductor connection that tested coaxial one-dimensional reinforced concrete member measures end is adopted
Use 75 ohm coaxial cable.
The positive effect of the present invention is:
1, coaxial one-dimensional reinforced concrete member is on the basis of varying without concrete material and method for designing so that concrete
Material self becomes a kind of sensing material.
2, concrete material presents different concrete dielectric constant under different larval instar, different health status, measures concrete
The change of dielectric constant, such that it is able to the health status in monitoring concrete each stage.
3, concrete health status is monitored in real time, scientifically grasp the dynamic change of concrete component structural behaviour, solve existing
There are the certainty of measurement of concrete NDT and stability, reliability to need the problem improved, meet the concrete structure day by day increased
The demand that part dynamically detects, it is achieved the early warning to improper health status.
(4) accompanying drawing explanation
Fig. 1 is circular coaxial one-dimensional reinforced concrete member structural representation in the present invention.
Fig. 2 is the coaxial one-dimensional reinforced concrete member structural representation of square in the present invention.
Connection figure when Fig. 3 is to use concrete dielectric constant measurement device measuring tested coaxial one-dimensional reinforced concrete member.
Fig. 4 is concrete dielectric constant measurement equipment structure chart.
Fig. 5 is to control server program flow chart.
Fig. 6 is microprocessor mastery routine.
Fig. 7 is intervalometer A interrupt routine figure.
Fig. 8 is intervalometer B interrupt routine figure.
Fig. 9 is parameter computation programme diagram.
Figure 10 is signal source circuit figure.
Figure 11 is signal amplifier circuit figure.
Figure 12 is programmable attenuator circuit diagram.
Figure 13 is that reflected signal processes circuit
Figure 14 is mixer figure.
Figure 15 is analog to digital conversion circuit figure.
1 be cross section be circular coaxial one-dimensional reinforced concrete member inner wire, 1,It is square coaxial for cross section
Dimension reinforced concrete member inner wire, 2-1～2-n be cross section be circular coaxial one-dimensional reinforced concrete member outer conductor
Stirrup, 3-1～3-m be for cross section be circular coaxial one-dimensional reinforced concrete member outer conductor indulge muscle, 3,-1～3,-m
Be for cross section for square coaxial one-dimensional reinforced concrete member outer conductor indulge muscle, 4,-1～4,-n be cross section be just
Square coaxial one-dimensional reinforced concrete member outer conductor stirrup, 5 concrete dielectric constant measurement equipment, 6 connect cables,
7 tested coaxial one-dimensional reinforced concrete members, 9 communication interfaces, 10 microprocessors, 11 signal sources, 12 power splitters,
13-1～13-3 signal amplifier, 14 measure connectivity ports, 15 directional couplers, 16 reflected signals process circuit,
17 frequency mixers, 18 mixed frequency signals process circuit, 19 analog to digital conversion circuits, 20 control server, 21-1～21-2 journeys
Controlling attenuation device.
(5) detailed description of the invention
Concrete dielectric constant measurement equipment 5 completes jointly with the inner and outer conductor of tested coaxial one-dimensional reinforced concrete member 7
Measure.
See accompanying drawing 4.
Concrete dielectric constant measurement equipment is by controlling server 20, microprocessor 10, signal source 11, power splitter 12, letter
Number amplifier 13-1～13-3, measurement connectivity port 14 and directional coupler 15, reflected signal process circuit 16, frequency mixer
17, mixed frequency signal processes circuit 18, analog to digital conversion circuit 19, programmable attenuator 21-1～21-2 composition, microprocessor 10
Connected by communication interface 9 and control server 20, control server 20 and carried out with microprocessor 10 by communication interface 9
Communication.
Concrete dielectric constant measurement equipment 5 is connected to connect on cable 6, the survey of tested coaxial one-dimensional reinforced concrete member
The inner and outer conductor of amount end is connected with being connected cable 6 inner and outer conductor, the outer conductor of tested coaxial one-dimensional reinforced concrete member
Connecting with being connected cable outer conductor, the inner wire of tested coaxial one-dimensional reinforced concrete member connects with being connected cable inner conductor；
Microprocessor connecting signal source 11, programmable attenuator 21-1,21-2 and analog to digital conversion circuit 19, the signal of signal source
Input power splitter 12, signal source signal is divided into two-way by power splitter, and frequency mixer 17 is delivered on a road, and a road is sent into signal and amplified
The circuit that device group 13-1～13-3 and programmable attenuator group 21-1～21-2 connect.Signal amplifier group 13-1～13-3 and program control
The circuit output signal that attenuator group 21-1～21-2 connect is connected to directional coupler 15, and directional coupler is by input signal
Give measurement connectivity port, and receive reflected signal from measuring connectivity port, the reflection letter measuring connectivity port that will receive
Number giving reflected signal and process circuit 16, reflected signal processes the output signal of circuit and is connected to frequency mixer 17；Frequency mixer
Output signal is sent into mixed frequency signal and is processed circuit 18, and mixed frequency signal processes circuit output and sends into analog to digital conversion circuit 19, modulus
Microprocessor is given in the output of change-over circuit.
Microprocessor uses the ZC706 development board that XILINX company of the U.S. produces.Communication interface uses the serial of ZC706
Interface.Controlling server is common desk computer or notebook computer
The circuit diagram of signal source sees accompanying drawing 10.
Wherein US1 is ADF4350, and ANALOG DEVICES company of the U.S. produces.US2 is 26MHZ active crystal agitator,
US3 is ADF4153, and ANALOG DEVICES company of the U.S. produces.
CLKA, DATAA, LEA, CLKB, DATAB, LEB, MUXS, MUXO, LD are connected to the I/O pin of ZC706.RFOUTA is connected to
The input of power splitter.
Signal amplifier circuit figure sees accompanying drawing 11.Wherein UA1 integrated circuit is model NBB-40, by U.S. RF Micro
Devices, Inc. company produces.
Power splitter use Shenzhen hundred receive (Shenzhen) company limited produce, model is ZN2PD2-63-S+MINI 0.35-6.0.
Power splitter input is connected to signal source RFOUTA, and output is connected respectively to the of the RF_INA of frequency mixer and signal amplifier group
The input of one-level.
Programmable attenuator sees Figure 12.
In figure, UA2 integrated circuit model is PE43704, raw by U.S. Peregrine Semiconductor Corp company
Produce.A0, A1, A2, D0, D1, D2, D3, D4, D5, D6, SI, CLK, LE, P/S are connected to the I/O pin of ZC706.
Reverse signal processes circuit and sees accompanying drawing 13.
Wherein, ULP1 is ADL5523, and ANALOG DEVICES company of the U.S. produces.RX_IN: be connected to directional couple
The reflected signal of device；RX_OUT is connected to frequency mixer VOUTA.
It is identical with reflected signal process circuit that mixer signal processes circuit.Wherein, RX_IN: be connected to frequency mixer S_OUT,
RX_OUT is connected to analog to digital conversion circuit input.
Directional coupler have employed and produced by ShangHai HuaXiang Computer Communication Engineering Co., Ltd, and model is SHX310-003060.
The circuit of frequency mixer sees accompanying drawing 14.
Wherein.UH1 is that ADL5350 is produced by ANALOG DEVICES company of the U.S..
S_OUT is connected to mixed frequency signal and processes the input of circuit.
Analog to digital conversion circuit sees accompanying drawing 15.
Wherein, U5 is AD9643, ANALOG DEVICES company of the U.S. produce.
VINA+ is connected to mixed frequency signal and processes circuit RX_OUT,
SCLK, SDO, CLK+, CLK-, D0+, D1+ ..., D13+, D0-, D1-..., D13-, it is all connected to ZC706's
I/O interface.
During measurement, the inner and outer conductor measuring end of tested coaxial one-dimensional reinforced concrete member be connected that cable 6 is inside and outside leads
Body is connected, and the outer conductor of tested coaxial one-dimensional reinforced concrete member connects with being connected cable outer conductor, tested coaxial one-dimensional steel
The inner wire of reinforced concrete component connects with being connected cable inner conductor；The measurement connectivity port of concrete dielectric constant measurement equipment
14 connect with being connected cable 6.
The present invention is on the basis of varying without concrete material and method for designing so that concrete material self becomes a kind of biography
Sense material.Rebar design in these concrete becomes coaxial cable form, is i.e. designed to the form of outer conductor and inner wire.Outward
Conductor combines by some stirrups, vertical muscle with inner wire.Vertical muscle along coaxial one-dimensional reinforced concrete member axial distribution,
Stirrup is distributed along cross-sectional direction, and the center that inner wire is positioned within reinforced concrete member is consistent with outer conductor shape
But dimension of hoop reinforcement is less than outer conductor, and outer conductor is positioned at the outside of concrete component, and meets setting of one-dimensional concrete design specification
Meter requirement.
Coaxial one-dimensional reinforced concrete member can be that cross section is the most circular, oval, square, rectangular coaxially
One-dimensional reinforced concrete member.According to its cross section by same to its one-dimensional reinforced concrete member of named circular coaxial, ellipse
The one-dimensional reinforced concrete member of axle, square coaxial one-dimensional reinforced concrete member, the coaxial one-dimensional armored concrete structure of rectangle
Part.No matter Code for design of concrete structures requirement is followed in the outer conductor design of which kind of coaxial one-dimensional reinforced concrete member, can
During to ensure outer conductor minimum 6 vertical muscle, design according to normal the Concrete Structure Design standard.If by normal coagulation
Soil structure design standard Design Treatment is indulged muscle and is less than 6, then 6 vertical muscle of design.Inner conductor structure is similar with outer conductor, but
Cross section is less than outer conductor cross section.Inner wire indulges the bar diameter of muscle employing can indulge, than outer conductor, the bar diameter that muscle uses
Little or identical, inner wire longitudinal bar spacing can be identical with outer conductor, or less than outer conductor spacing, but the minimum guarantor of inner wire
Demonstrate,prove 6 vertical muscle.Inner wire design also needs to meet to require as follows:
If concrete dielectric constant is ε, make k=0.36, or 0.54, make x=k ε0.5, k is internal diameter design factor, x
For internal diameter gauge index
I.e. x is multiplied by 0.5 power of concrete dielectric constant equal to 0,36, or it is normal to be multiplied by concrete dielectric equal to 0,54
0.5 power of number
Embodiment 1.See accompanying drawing 1,3.
The outer conductor of the one-dimensional reinforced concrete member of circular coaxial is combined by circular stirrups 2-1～2-n, vertical muscle 3-1～3-m.
The circular, hoop flaccidity of tendon and muscle muscle that inner wire 1 is similar to outer conductor structure combines, but circular stirrups diameter is than outer conductor circular, hoop
Muscle is little, and inner wire is positioned at the shaft core position within reinforced concrete member.
Reinforced concrete member one-dimensional for circular coaxial, the external diameter r of inner wire equal to outer conductor interior through R divided by 10
X power, it may be assumed that r=R/10x
Oval coaxial one-dimensional reinforced concrete member reinforced concrete member one-dimensional with circular coaxial is similar, and simply stirrup is ellipse
Circular.One-dimensional armored concrete coaxial for ellipse, if the major axis of outer conductor is A, short axle is B, and inner wire major axis is
A, short axle is b.Then a is equal to the x power that A is divided by 10, and b is equal to the x power that B is divided by 10.
That is: a=A/10x；B=B/10x。
As k=0.36, the connection electricity that the inner and outer conductor of tested circle or oval coaxial one-dimensional reinforced concrete member connects
Cable uses 50 ohm coaxial cable.
As k=0.54, the connection electricity that the inner and outer conductor of tested circle or oval coaxial one-dimensional reinforced concrete member connects
Cable uses 75 ohm coaxial cable.
Embodiment 2.See accompanying drawing 2,3.
One-dimensional reinforced concrete member coaxial for square, if the length of side of outer conductor is LN, the inner wire length of side is l；Then l
Equal to LN divided by 10 x power,
That is: l=LN/ (10x)。
Same, as k=0.36,；The company that the inner and outer conductor of the coaxial one-dimensional reinforced concrete member of tested square connects
Connect cable and use 50 ohm coaxial cable；
As k=0.54,；The connection cable that the inner and outer conductor of the coaxial one-dimensional reinforced concrete member of tested square connects is adopted
Use 75 ohm coaxial cable.
One-dimensional reinforced concrete member coaxial for rectangle, if a length of Y of outer conductor, a width of W, a length of y of inner wire,
A width of w.Then y is equal to the x power that Y is divided by 10, and w is equal to the x power that W is divided by 10
That is: y=Y/ (10x)；W=W/ (10x)。
No matter measuring which kind of coaxial one-dimensional reinforced concrete member, it is identical with flow process that it measures process.
Control server in concrete dielectric constant measurement equipment 5 is by the communication with microprocessor, to tested the most one-dimensional
The measurement of reinforced concrete member is controlled, and controls server and microprocessor is assigned control command, arrange measurement parameter,
Measurement result is sent to control server by microprocessor simultaneously.
The measurement procedure of tested coaxial one-dimensional reinforced concrete member is included controlling server by concrete dielectric constant measurement equipment
Program circuit and microprocessor program flow process；Microprocessor program flow process includes that microprocessor mastery routine, intervalometer A interrupt
Program, intervalometer B interrupt routine, parameter computation program.
See accompanying drawing 5.
Control server program flow process:
The first step: sending to microprocessor and arrange systematic parameter order, the systematic parameter sent includes: analog digital conversion
Sample frequency Fadc, signal source low-limit frequency Flow, signal source highest frequency Fhigh, signal source stepping number of times Cstep,
Signal source stepping time interval Tstep, detected concrete component length L, programmable attenuator attenuation parameter, enter the
Two steps；
Second step: receive microprocessor measurement data, returns the first step；
See accompanying drawing 6.
Microprocessor mastery routine:
The first step, receives and controls the control parameter command that server sends, and performs to control the parameter that server sends
Order, makes Dmax be equal to Fadc and is multiplied by Cstep and is multiplied by Tstep；Definition analog to digital conversion circuit datum number storage group,
Representing with DATAadc, array length is Dmax, enters second step；
Second step, arranging the timing of intervalometer A is 1 divided by Fadc；The timing arranging intervalometer B is
Tstep, enters the 3rd step；
3rd step, arranges the value of following variable, and CntStep is equal to 0；Fsignal is equal to Flow；Fcnt is equal to 0；
Idata is equal to 0；Fcal is equal to 0, arranges Fstep and deducts Flow equal to Fhigh, and its difference, divided by Cstep, is entered
Enter the 4th step；
4th step, arranging signal source frequency is Fsignal, enters the 5th step；
5th step, arranges intervalometer A and produces interruption when arriving timing, arrange when intervalometer A interrupts and call
Intervalometer A interrupt routine；Intervalometer B is set and produces interruption when arriving timing, intervalometer B is set and interrupts
Time call intervalometer B interrupt routine, enter the 6th step；
6th step, it is judged that whether Fcal is equal to 1？If equal to 1, then entering the 7th step, if being not equal to 1, returning
Return the 6th step；
7th step, arranges Fcal equal to 0, and parameter result of calculation is given control clothes by call parameters counting subroutine
Business device, returns the 6th step.
See accompanying drawing 7.
Intervalometer A interrupt routine in microprocessor program flow process:
The first step: gather analog-digital converter data, analog-digital converter data are stored DATAadc [Idata], order
Idata is equal to Idata+1, enters second step；
Second step: judge that whether CntStep is equal to 0？If CntStep is equal to 0, then enter the 3rd step, if
CntStep is not equal to 0, then make Fcnt be equal to 1, and the interrupt routine that stop timing device A produces；
3rd step, it is judged that whether Fcnt is equal to 1？If equal to 1, then enter the 4th step, if being not equal to 1, then
The interrupt routine that stop timing device A produces；
4th step, makes Fcnt be equal to 0；Idata is made to be equal to 0；Make Fcal be equal to 1, and stop timing device A produces
Raw interrupt routine；
See accompanying drawing 8.
Intervalometer B interrupt routine in microprocessor program flow process:
The first step arranges Fsignal and adds Fstep equal to Fsignal；CntStep is set and adds 1 equal to CntStep,
Enter second step；
Second step, arranging signal source frequency is Fsignal, enters the 3rd step；
3rd step, it is judged that whether CntStep is equal to Cstep？If equal, enter the 4th step, if unequal,
Interrupt routine terminates；
4th step, arranges CntStep and is equal to 0, arranges Fsignal and is equal to Flow, and interrupt routine terminates.
See accompanying drawing 9.
Parameter computation program:
The first step: array DATAadc is carried out fast Fourier transform, if fast Fourier transform result is number
Group FFTadc, enters second step；
Second step: search FFTadc maximum, if being designated as Index under at array FFTadc maximum.Enter the
Three steps；
3rd step: measured electromagnetic signal transmission speed V represents, if A is equal to Dmax-1 equal to Index-1, B,
C deducts Flow, D equal to Fhigh and deducts E, V divided by C, F equal to D equal to Cstep divided by C, E equal to 1
It is multiplied by L divided by A equal to B, then divided by F, can be formulated as: V=BL/ (AF)；Dielectric constant is equal to
Permittivity of vacuum be multiplied by light spread speed in a vacuum square divided by V square, be formulated as:
ε0(light spread speed/V in a vacuum)2；Return mastery routine.
ε0Represent permittivity of vacuum, ε0=8.854187817 × 10-12(F/m)。
Owing to concrete material presents differing dielectric constant under different larval instar, different health status, measure concrete dielectric
The change of constant, such that it is able to the health status in monitoring concrete each stage.
Claims (7)
1. a coaxial one-dimensional reinforced concrete member concrete dielectric constant measurement equipment, it is characterised in that: concrete dielectric
Constant measurement equipment (5) completes to measure with the inner and outer conductor of tested coaxial one-dimensional reinforced concrete member (7) jointly；With
Reinforcing bar in the one-dimensional reinforced concrete member of axle is coaxial cable structure, has outer conductor and inner wire, and outer conductor is equal with inner wire
Being combined by some stirrups, vertical muscle, vertical muscle is along coaxial one-dimensional reinforced concrete member axial distribution, and stirrup is along cross section side
To distribution, inner wire is positioned at that the center within reinforced concrete member is consistent with outer conductor shape but dimension of hoop reinforcement is less than
Outer conductor, outer conductor is positioned at the outside of concrete component, and meets the requirement of one-dimensional concrete component design specification；
Concrete dielectric constant measurement equipment (5) by control server (20), microprocessor (10), signal source (11),
Power splitter (12), signal amplifier (13-1～13-3), measurement connectivity port (14) and directional coupler (15), reflection
Signal processing circuit (16), frequency mixer (17), mixed frequency signal process circuit (18), analog to digital conversion circuit (19), program control
Attenuator (21-1～21-2) forms, and microprocessor (10) connects control server (20) by communication interface (9)；
Concrete dielectric constant measurement equipment (5) is connected to connect on cable (6), tested coaxial one-dimensional reinforced concrete member
The inner and outer conductor measuring end is connected with the inner and outer conductor being connected cable (6), tested coaxial one-dimensional reinforced concrete member
Outer conductor be connected cable outer conductor connect, the inner wire of tested coaxial one-dimensional reinforced concrete member be connected cable inner conductor
Connect；
Microprocessor connecting signal source (11), programmable attenuator (21-1,21-2) and analog to digital conversion circuit (19), signal source
Signal input power splitter (12), signal source signal is divided into two-way by power splitter, and frequency mixer (17) is delivered on a road,
The circuit that one tunnel feeding signal amplifier group (13-1～13-3) and programmable attenuator group (21-1～21-2) connect；Letter
Number amplifier group (13-1～13-3) and programmable attenuator group (21-1～21-2) connect the output signal of circuit and are connected to orientation
Bonder (15), directional coupler input signal is given measurement connectivity port, and from measure connectivity port receive reflected signal,
Giving reflected signal by the reflected signal measuring connectivity port received and process circuit (16), reflected signal processes the defeated of circuit
Go out to be signally attached to frequency mixer (17)；The output signal of frequency mixer is sent into mixed frequency signal and is processed circuit (18), at mixed frequency signal
Analog to digital conversion circuit (19) is sent in reason circuit output, and microprocessor is given in the output of analog to digital conversion circuit.
2. concrete dielectric constant measurement equipment as claimed in claim 1, it is characterised in that: tested coaxial one-dimensional reinforcing bar mixes
The inner and outer conductor of solidifying soil component (7) indulges muscle quantity all not less than 6.
The measurement equipment of coaxial one-dimensional reinforced concrete member the most as claimed in claim 1, it is characterised in that: the most one-dimensional
Reinforced concrete member cross section is circular or oval or square or rectangular.
4. the concrete dielectric constant measurement method of a coaxial one-dimensional reinforced concrete member, it is characterised in that: use such as power
Profit requires that tested coaxial one-dimensional reinforced concrete member is measured by concrete dielectric constant measurement equipment (5) described in 1；
Before measuring, the inner and outer conductor that tested coaxial one-dimensional reinforced concrete member is measured end is inside and outside be connected cable (6)
Conductor is connected, and connecting cable (6) is coaxial cable；The measurement end outer conductor of tested coaxial one-dimensional reinforced concrete member and company
Connect cable (6) outer conductor connect, tested coaxial one-dimensional reinforced concrete member measure end inner wire be connected cable (6)
Inner wire connects；The measurement connectivity port (14) of concrete dielectric constant measurement equipment connects (6) with being connected cable；
Concrete dielectric constant measurement equipment (5) controls server by the communication with microprocessor, to tested coaxially
The measurement of one-dimensional reinforced concrete member is controlled, and controls server and microprocessor is assigned control command, arranges measurement ginseng
Number, measurement result is sent to control server by microprocessor simultaneously；
The measurement procedure of tested coaxial one-dimensional reinforced concrete member is included controlling server by concrete dielectric constant measurement equipment
Program circuit and microprocessor program flow process；Microprocessor program flow process includes that microprocessor mastery routine, intervalometer A interrupt
Program, intervalometer B interrupt routine, parameter computation program；
Control server program flow process:
The first step: sending to microprocessor and arrange systematic parameter order, the systematic parameter sent includes: analog digital conversion is sampled
Frequency Fadc, signal source low-limit frequency Flow, signal source highest frequency Fhigh, signal source stepping number of times Cstep, signal
Stepping time interval, source Tstep, detected concrete component length L, programmable attenuator attenuation parameter, enter second step；
Second step: receive microprocessor measurement data, returns the first step；
Microprocessor mastery routine:
The first step, receives and controls the control parameter command that server sends, and performs to control the parameter command that server sends,
Make Dmax be equal to Fadc be multiplied by Cstep and be multiplied by Tstep:Dmax=Fadc × Cstep × Tstep；Definition analog digital conversion electricity
Circuit-switched data storage array, represents with DATAadc, array length is Dmax, enters second step；
Second step, arranging the timing of intervalometer A is 1 divided by analog digital conversion sample frequency Fadc；Arrange intervalometer B's
Timing is that signal source stepping time is spaced Tstep, enters the 3rd step；
3rd step, arranges the value of following variable, enters to count CntStep equal to 0；Signal frequency Fsignal is equal to Flow；
Frequency counting Fcnt is equal to 0；Data subscript Idata is equal to 0；Calculation flag Fcal is equal to 0, arranges step frequency Fstep
Equal to signal source highest frequency Fhigh subtraction signal source low-limit frequency Flow, its difference is divided by signal source stepping number of times Cstep:
Fstep=(Fhigh-Flow)/Cstep, enters the 4th step；
4th step, arranging signal source frequency is Fsignal, enters the 5th step；
5th step, arranges intervalometer A and produces interruption when arriving timing, arrange when intervalometer A interrupts and call intervalometer
A interrupt routine；Intervalometer B is set and produces interruption when arriving timing, arrange when intervalometer B interrupts and call intervalometer B
Interrupt routine, enters the 6th step；
6th step, it is judged that whether Fcal is equal to 1？If equal to 1, then entering the 7th step, if being not equal to 1, returning the 6th
Step；
7th step, arranges Fcal equal to 0, and parameter result of calculation is given control server by call parameters counting subroutine,
Return the 6th step.
The concrete dielectric constant measurement method of coaxial one-dimensional reinforced concrete member the most as claimed in claim 4, its feature exists
In: the intervalometer A interrupt routine in described microprocessor program flow process:
The first step: gather analog-digital converter data, analog-digital converter data are stored DATAadc [Idata], makes Idata etc.
In Idata+1, enter second step；
Second step: judge that whether CntStep is equal to 0？If CntStep is equal to 0, then enter the 3rd step, if CntStep
It is not equal to 0, then makes Fcnt be equal to 1, and the interrupt routine that stop timing device A produces；
3rd step, it is judged that whether Fcnt is equal to 1？If equal to 1, then enter the 4th step, if being not equal to 1, then it is fixed to terminate
Time device A produce interrupt routine；
4th step, makes Fcnt be equal to 0；Idata is made to be equal to 0；Fcal is made to be equal to 1, and the interruption that stop timing device A produces
Program；
Intervalometer B interrupt routine in described microprocessor program flow process:
The first step arranges Fsignal and adds Fstep:Fsignal=Fsignal+Fstep equal to Fsignal；CntStep is set
Add 1:CntStep=CntStep+1 equal to CntStep, enter second step；
Second step, arranging signal source frequency is Fsignal, enters the 3rd step；
3rd step, it is judged that whether CntStep is equal to Cstep？If equal, enter the 4th step, if unequal, interrupt journey
Sequence terminates；
4th step, arranges CntStep and is equal to 0, arranges Fsignal and is equal to Flow, and interrupt routine terminates；
Described parameter computation program:
The first step: array DATAadc is carried out fast Fourier transform, if fast Fourier transform result is array FFTadc,
Enter second step；
Second step: search FFTadc maximum, if being designated as Index under at array FFTadc maximum.Enter the 3rd step；
3rd step: measured electromagnetic signal transmission speed V represents, if A is equal to Dmax-1, C equal to Index-1, B
Deduct Flow, D equal to Fhigh and deduct E, V equal to B divided by C, F equal to D equal to Cstep divided by C, E equal to 1
It is multiplied by L divided by A, then divided by F, can be formulated as: V=BL/ (AF)；Dielectric constant is equal to permittivity of vacuum
Be multiplied by light spread speed in a vacuum square divided by V square, be formulated as:
ε0(light spread speed/V in a vacuum)2
Return mastery routine；In formula, ε0Represent permittivity of vacuum, ε0=8.854187817 × 10-12(F/m)。
6. the measuring method of the coaxial one-dimensional reinforced concrete member reflected based on frequency domain as claimed in claim 4, its feature
It is: the vertical muscle quantity of the inner and outer conductor of tested coaxial one-dimensional reinforced concrete member 7 is not less than 6；
Tested coaxial one-dimensional reinforced concrete member inner wire need to meet following requirement:
If concrete dielectric constant is ε, make k=0.36, or 0.54, make x=k ε0.5, k is internal diameter design factor, and x is
Internal diameter gauge index；
Coaxial one-dimensional reinforced concrete member is respectively circular, oval, square, rectangle according to cross section, orders respectively
The one-dimensional reinforced concrete member of entitled circular coaxial, oval coaxial one-dimensional reinforced concrete member, the coaxial one-dimensional steel of square
The coaxial one-dimensional reinforced concrete member of reinforced concrete component, rectangle；
Reinforced concrete member one-dimensional for circular coaxial, the external diameter r of inner wire equal to outer conductor internal diameter R divided by 10 x
Power, it may be assumed that r=R/10x,
One-dimensional reinforced concrete member coaxial for ellipse, if the major axis of outer conductor is A, short axle is B, inner wire major axis
For a, short axle is b, then a is equal to the x power that A is divided by 10, and b is equal to the x power that B is divided by 10,
That is: a=A/10x；B=B/10x
One-dimensional reinforced concrete member coaxial for square, if the length of side of outer conductor is LN, the inner wire length of side is l；Then l
Equal to LN divided by 10 x power,
That is: l=LN/10x
One-dimensional reinforced concrete member coaxial for rectangle, if a length of Y of outer conductor, a width of W, a length of y of inner wire,
A width of w, then y is equal to the x power that Y is divided by 10, and w is equal to the x power that W is divided by 10
That is: y=Y/10x；W=W/10x。
7. the measuring method of the coaxial one-dimensional reinforced concrete member reflected based on frequency domain as claimed in claim 6, its feature
Be: described in set concrete dielectric constant as ε, make k=0.36, or 0.54, make x=k ε0.5,
As k=0.36, the connection cable being connected with the inner and outer conductor of tested coaxial one-dimensional reinforced concrete member measurement end is adopted
Use 50 ohm coaxial cable；
As k=0.54, tested coaxial one-dimensional reinforced concrete member measures the connection cable employing that the inner and outer conductor of end connects
75 ohm coaxial cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610587573.8A CN105974205B (en) | 2016-07-22 | 2016-07-22 | Coaxial one-dimensional reinforced concrete member concrete dielectric constant measurement device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610587573.8A CN105974205B (en) | 2016-07-22 | 2016-07-22 | Coaxial one-dimensional reinforced concrete member concrete dielectric constant measurement device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105974205A true CN105974205A (en) | 2016-09-28 |
| CN105974205B CN105974205B (en) | 2018-08-14 |
Family
ID=56952767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610587573.8A Expired - Fee Related CN105974205B (en) | 2016-07-22 | 2016-07-22 | Coaxial one-dimensional reinforced concrete member concrete dielectric constant measurement device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105974205B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014987A (en) * | 2017-06-06 | 2017-08-04 | 四川大学 | The intelligent Multiinputoutput concrete component health monitor method of square-section self-induction |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4482659B2 (en) * | 2004-04-07 | 2010-06-16 | 独立行政法人産業技術総合研究所 | Dielectric property measurement evaluation method |
| CN102692431A (en) * | 2012-06-18 | 2012-09-26 | 四川大学 | Concrete crack detector with reinforcing bar as electrode |
| JP5499379B2 (en) * | 2009-08-28 | 2014-05-21 | 独立行政法人国立高等専門学校機構 | Liquid dielectric constant measuring apparatus and measuring method |
| CN104965004A (en) * | 2015-06-11 | 2015-10-07 | 四川大学 | Steel bar coaxial cable structure one-dimensional concrete health monitoring method and step tester |
| CN204694666U (en) * | 2015-06-11 | 2015-10-07 | 四川大学 | The step test instrument of reinforcing bar coaxial cable structure one dimension concrete health monitoring |
| CN206020539U (en) * | 2016-07-22 | 2017-03-15 | 四川大学 | Coaxial one-dimensional reinforced concrete member concrete dielectric constant measurement equipment |
-
2016
- 2016-07-22 CN CN201610587573.8A patent/CN105974205B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4482659B2 (en) * | 2004-04-07 | 2010-06-16 | 独立行政法人産業技術総合研究所 | Dielectric property measurement evaluation method |
| JP5499379B2 (en) * | 2009-08-28 | 2014-05-21 | 独立行政法人国立高等専門学校機構 | Liquid dielectric constant measuring apparatus and measuring method |
| CN102692431A (en) * | 2012-06-18 | 2012-09-26 | 四川大学 | Concrete crack detector with reinforcing bar as electrode |
| CN104965004A (en) * | 2015-06-11 | 2015-10-07 | 四川大学 | Steel bar coaxial cable structure one-dimensional concrete health monitoring method and step tester |
| CN204694666U (en) * | 2015-06-11 | 2015-10-07 | 四川大学 | The step test instrument of reinforcing bar coaxial cable structure one dimension concrete health monitoring |
| CN206020539U (en) * | 2016-07-22 | 2017-03-15 | 四川大学 | Coaxial one-dimensional reinforced concrete member concrete dielectric constant measurement equipment |
Non-Patent Citations (1)
| Title |
|---|
| 李秋实: "浇注式沥青混凝土介电特性研究", 《公路工程》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014987A (en) * | 2017-06-06 | 2017-08-04 | 四川大学 | The intelligent Multiinputoutput concrete component health monitor method of square-section self-induction |
| CN107014987B (en) * | 2017-06-06 | 2023-04-25 | 四川大学 | Rectangular section self-induction intelligent multi-input-output concrete member health monitoring method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105974205B (en) | 2018-08-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105429714B (en) | A kind of T/R component test devices and equipment safety method of calibration | |
| CN104807594A (en) | Automatic measuring system based on matrix switch | |
| CN104535955B (en) | The calibrating installation and its calibration method of transformer method of frequency response method winding deformation tester | |
| EP3444622B1 (en) | Vector network analyzer with digital interface | |
| CN102016614A (en) | Methods and apparatus that selectively use or bypass a remote pin electronics block to test at least one device under test | |
| CN106506099A (en) | A kind of device and method for digital T/R component environments experimental test | |
| CN105807132B (en) | A kind of method and device of detection accelerator radio-frequency cavity off-resonance frequency | |
| CN105136859B (en) | Two-dimentional concrete health monitor method based on reinforcing bar electrode | |
| CN109359414A (en) | Strain method of real-time under component of machine key position measuring point optimization layout | |
| CN104849290A (en) | Three-dimensional concrete health detection method based on reinforcing steel bar antenna and detection circuit thereof | |
| CN106154054A (en) | The dielectric constant measurement equipment of the coaxial one-dimensional reinforced concrete member of intelligence and method | |
| CN105974205A (en) | Coaxial one-dimensional reinforced concrete member concrete dielectric constant measuring device and method | |
| CN205879837U (en) | Coaxial reinforced concrete member measuring equipment of one -dimensional based on equivalent circuit | |
| CN102353867A (en) | Interconnection test equipment and method | |
| CN105973944B (en) | One-dimensional coaxial reinforced concrete member measuring apparatus and method based on equivalent circuit | |
| CN206020539U (en) | Coaxial one-dimensional reinforced concrete member concrete dielectric constant measurement equipment | |
| CN105606984B (en) | A kind of the multi-parameter parallel test system and method for test semiconductor wafer | |
| CN205844240U (en) | The coaxial one-dimensional reinforced concrete member of intelligence based on frequency domain reflection measures equipment | |
| CN205898904U (en) | Coaxial one -dimensional reinforced concrete member's of intelligence dielectric constant measuring equipment | |
| CN106018486B (en) | One-dimensional coaxial reinforced concrete member measuring apparatus and method based on frequency domain reflection | |
| CN204694667U (en) | Based on the two-dimentional concrete parameters tester of reinforcing bar electrode | |
| CN206038784U (en) | Live line measurement zinc oxide arrester's wireless tester | |
| CN102855167B (en) | Double-channel computer advanced intelligent network (AIN) functional circuit capable of implementing 100 percent BIT (built in test) coverage | |
| CN207051290U (en) | The self-induction intelligence Multiinputoutput health monitoring equipment of rectangular reinforced concrete component | |
| CN207301066U (en) | The self-induction intelligence Multiinputoutput health monitoring equipment of circular cross-section reinforcing bar concrete component |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180814 Termination date: 20190722 |