CN104965004B - The one-dimensional concrete health monitor method of reinforcing bar coaxial cable structure and step test instrument - Google Patents
The one-dimensional concrete health monitor method of reinforcing bar coaxial cable structure and step test instrument Download PDFInfo
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Abstract
The invention discloses a kind of one-dimensional concrete health monitor method of reinforcing bar coaxial cable structure and step test instrument.Method of testing is connected on the port of detecting instrument using inner and outer conductor and tested based on the one-dimensional concrete of reinforcing bar cCoax construction for having inside and outside two conductor.During using step test instrument, the inner wire and outer conductor of concrete one end are connected in parallel in a port of step test instrument, are tested with the method for step signal time delay.When using vector network analyzer, on the outer conductor and inner wire that a port of vector network analyzer is connected to detected concrete one end, tested with time domain S parameter method；Two ports of vector network analyzer are connected respectively on the inner wire and outer conductor at detected concrete two ends, tested according to a variety of S parameters.Step test instrument is made up of step generator, signal amplification circuit, analog to digital conversion circuit, microprocessor.The present invention can be monitored in real time, early warning concrete quality, simple and convenient reliable.
Description
(1) technical field
The invention belongs to construction material detection, it is related to concrete quality test, the particularly coagulation of reinforcing bar cCoax construction
The one-dimensional health monitoring of soil.
(2) background technology
Concrete is widely used in a kind of important engineering material of building construction, science of bridge building, hydraulic engineering etc., coagulation
Native health detection and monitoring instrument are to ensure the technological means that concrete is run safely for a long time.Concrete health prediction, forecast,
Diagnosis is one of current main bugbear for being badly in need of capturing in the world.Highway, bridge, dam and other work civil buildings, all
It need to carry out regularly or health detection and monitoring in real time.But existing RC axial loading column means can't be adapted to completely
The need for development.The Chinese patents of Patent No. ZL 2,006 100200932.8《Concrete damage inspection based on impedance imaging
Survey method and apparatus》, for the purpose of detecting concrete damage, the technology of impedance imaging is employed, better effects are achieved.But
In actual use, because detecting electrode can not be compatible well with concrete, there is certain application limitation.
Patent No. ZL 2,012 1 0199249.0 Chinese patent《Detected using reinforcing bar as the distress in concrete of electrode
Instrument》, using the relation between emission electrode pumping signal and the response signal of receiving electrode, judge distress in concrete.The invention
Crack is predominantly detected, other abnormal behaviours are not detected.
Patent No. ZL 2,013 1 0029782.7 Chinese patent《Concrete monitor by electrode of reinforcing bar and
Monitor and detection method》, the electrical parameter between electrode, two reinforcing bar electrodes of detection is done using reinforcing bar, distress in concrete is judged.The hair
It is bright to propose a kind of monitoring method, but provide different method of testings not according to the different structure of armored concrete.
(3) content of the invention
The purpose of the present invention is to provide one-dimensional concrete health monitoring tester, the particularly basis of step test instrument
On provide the one-dimensional concrete health monitor method based on reinforcing bar cCoax construction.The healthy shape of one-dimensional concrete is monitored in real time
Condition, finds concrete lesion and forecasting and warning in time.
What the purpose of the present invention was achieved in that：One-dimensional concrete of the method for testing based on reinforcing bar cCoax construction, one
Dimension concrete has inside and outside two conductor, and axle center is inner wire, and outer conductor is formed by the stirrup around inner wire and vertical muscle construction, outside
The construction of conductor is identical with existing one-dimensional concrete construction, by the inner wire of the one-dimensional concrete based on reinforcing bar cCoax construction
Tested with one end in the two ends of outer conductor or two ends are connected on the test interface of detecting instrument simultaneously；Detecting instrument
Respectively step test instrument and vector network analyzer.
When being tested using step test instrument, the step generator that one-dimensional concrete one end is connected to step test instrument is surveyed
Try and tested according to the method for reflected signal delay on mouth.
Be divided into two kinds using the method for testing of vector network analyzer, by the port one of vector network analyzer be connected to by
On the outer conductor and inner wire for surveying concrete one end, tested according to time domain S parameter method；By the end of vector network analyzer
Mouth one is connected on the inner wire and outer conductor of detected concrete one end, and the port two of vector analysis instrument is connected into tested coagulation
On the inner wire and outer conductor of the native other end, tested according to a variety of S parameter methods.
According to the method for testing of reflected signal delay when being tested using step test instrument：Under micro-processor control, step
Signal generator sends periodic step signal, and signal frequency is less than 1 megahertz, signal amplification circuit amplification test interface
Signal, the signal after amplification gives microprocessor, microprocessor after analog signal is switched to data signal by analog to digital conversion circuit
Device is handled data, draws test result.
Tested using vector network analyzer according to time domain S parameter method：With vector analysis instrument time domain S11Parameter is entered
Row measurement, analyzes number and the reflection interval of pip, draws test result.
Tested using vector network analyzer according to a variety of S parameter methods：First test with detected concrete structure and
Multiple frequency domain parameters of specification identical health concrete, the corresponding frequency domain ginseng of re-test detected concrete correspondence measurement port
Number, the corresponding frequency domain parameter of healthy concrete and detected concrete is contrasted, test result is drawn.
Using method of testing of the step test instrument according to reflected signal delay, detailed process is：Under microprocessor control, step
Signal generator sends periodic step signal, and signal frequency is less than 1 megahertz, signal amplification circuit amplification test interface
Signal, the signal after amplification is sent after analog signal is switched to data signal by analog to digital conversion circuit under the fixed sampling period
Data are handled to microprocessor, process is as follows：
1) absolute value of adjacent data difference, is calculated；
2) the absolute value sum of multiple adjacent data differences, is calculated, when the absolute value sum is more than one beforehand through experiment
The threshold value of determination, and when being the maximum of absolute value sum of periphery adjacent data difference, there is the sampling instant of the value in record,
And be transition point by the moment definition；
3), judge that step signal sends the time, it is step signal starting point to determine some transition point：Originated with step signal
The different transition point of point is signal reflex point, when signal reflex point number is more than or equal to 2, judges that one-dimensional concrete has damage；
4), when signal reflex point number is more than or equal to 2, the mould between signal reflex point and step signal starting point is calculated
Number conversion sampling numbers, the sampling number be multiplied by the sampling period and divided by two be exactly signal reflex point and step signal starting point it
Between light velocity propagation time t.The light velocity is multiplied by with time t, signal reflex point is obtained to the distance between step signal starting point, this
Distance is exactly that impaired loci or the detected concrete other end arrive the distance between connectivity port.
It is to use vector analysis instrument time domain S when being tested according to time domain S parameter method using vector network analyzer11
Parameter is tested, and analyzes number and the reflection interval of pip；If pip number is more than or equal to 2, illustrate detected concrete
There is exception；If pip number be more than or equal to 2, be multiplied by respectively with the reflection interval of each pip the light velocity and divided by 2, obtain letter
Number pip is to the distance between vector network analyzer port, and this distance is exactly impaired loci or the detected concrete other end to quilt
Survey concrete and the distance of vector network analyzer connection end.
Using vector network analyzer, the process tested according to a variety of S parameters is：
1), it is defined as contrasting concrete with detected concrete structure and the healthy concrete of specification identical, by vector network
The port one of analyzer is connected on the inner wire and outer conductor of contrast concrete one end, and the port two of vector analysis instrument is connected
Onto the inner wire and outer conductor of the contrast concrete other end, frequency domain S11, S12, S21, the S22 parameter of test comparison concrete,
These parameters are calculated as SA11, SA12, SA21, SA22；
2), the port one of vector network analyzer is connected on the inner wire and outer conductor of detected concrete one end, will
The port two of vector analysis instrument is connected on the inner wire and outer conductor of the detected concrete other end, tests the frequency of detected concrete
These parameters are calculated as SB11, SB12, SB21, SB22 by domain S11, S12, S21, S22 parameter；
3), respectively reduced parameter SA11 and parameter SB11, parameter SA12 and parameter SB12, parameter SA21 and parameter SB21,
Difference between parameter SA22 and parameter SB22, if parameter is different, judges that detected concrete has damage.
One-dimensional concrete has inside and outside two conductor, and axle center is inner wire, and its inner wire is according to the side using a reinforcing bar
Method, or made by the way of the stirrup similar with outer conductor structure, vertical muscle are combined, for circular stirrups section, inner wire
Stirrup diameter of section is necessarily less than the stirrup diameter of section of outer conductor, for square stirrup section, the stirrup section of inner wire
The length and the width in stirrup section in the long and wide stirrup section for being necessarily less than outer conductor；Outer conductor uses reinforcing bar, by stirrup, vertical muscle group
The outer ring of synthesizing one-dimensional concrete, is used as outer conductor.The reinforcement constitution phase of the construction and existing one-dimensional armored concrete of outer conductor
Together.
Step test instrument is made up of step generator, signal amplification circuit, analog to digital conversion circuit, microprocessor, rank
The output of jump signal generator is connected with signal amplification circuit input, and the simulation input of analog to digital conversion circuit is connected to signal amplification
In the output of circuit, the data signal that analog-digital converter is converted to is conveyed to microprocessor, and microprocessor is sent out with step signal
Raw device connection, controls the generation of step signal.Microprocessor is on-site programmable gate array FPGA, or Digital Signal Processing electricity
Road DSP.
The positive effect of the present invention is：
1st, one-dimensional concrete health status is detected, and makes quality evaluation, particularly building construction, bridge in time to building
The count for much building concrete security situation of the people's livelihood such as beam engineering, hydraulic engineering makes accurate judgment.
2nd, one-dimensional concrete health status can be monitored in real time, and concrete lesion and forecasting and warning are found in time, will safety
Accident is eliminated before generation, it is to avoid major accident occurs.
3rd, tester is provided for one-dimensional concrete health monitoring, step test instrument is simple in construction, easy to use and reliable, sweared
Measure Network Analyzer and use existing instrument, it is convenient to realize.
(4) illustrate
Fig. 1 is the one-dimensional concrete schematic diagram of circular reinforcing bar cCoax construction.
Fig. 2 is the one-dimensional concrete schematic diagram that section is square reinforcing bar cCoax construction.
Fig. 3 is step test instrument structural representation.
Fig. 4 is annexation schematic diagram of the step test instrument with being tested one-dimensional concrete.
Fig. 5 is that vector network analyzer is one-dimensional mixed with being tested when carrying out the test of time domain S parameter using vector network analyzer
Solidifying soil connection diagram.
Fig. 6 is that vector network analyzer is one-dimensional mixed with being tested when carrying out a variety of S parameter tests using vector network analyzer
Solidifying soil connection diagram.
Fig. 7 is the step generator circuit diagram in step test instrument.
Fig. 8 is the signal amplification circuit figure in step test instrument.
Fig. 9~11 are D/A converting circuits in step test instrument, wherein, Fig. 9 is analog-to-digital conversion clock driver circuit figure,
Figure 10 is analog signal input difference drive circuit, Figure 11 D/A converter module circuit diagrams.
Figure 12~Figure 17 is the circuit diagram that microprocessor uses on-site programmable gate array FPGA in step test instrument.
In figure, 1 axle center, 2-1~2-n circular stirrups, 3-1~3-m indulge muscle, 4-1~4-n square stirrups, 5 step signals hair
Raw device, 6 signal amplification circuits, 7 analog to digital conversion circuits, 8 microprocessors, 9-1,9-2 test interface, 10 step test instrument, 11 quilts
Survey one-dimensional concrete, 12 outer conductors, 13 inner wires, 14 vector network analyzers.
(5) embodiment
Embodiment 1.
Referring to accompanying drawing 1.The tested one-dimensional concrete section of this example is circle.Axle center is inner wire, is a reinforcing bar.Lead outside
Body is combined by some circular stirrups 2-1~2-n, vertical muscle 3-1~3-m.
Inner wire can also be combined by some circular stirrups similar to outer conductor structure, vertical muscle, but circular stirrups are cut
Face diameter is smaller than outer conductor stirrup diameter of section.
Embodiment 2.
Referring to accompanying drawing 2.The tested one-dimensional concrete section of this example is square.Axle center is inner wire, is a reinforcing bar.Lead outside
Body is combined by square stirrup 4-1~4-n and vertical muscle 3-1~3-m.
Inner wire is also combined by some square stirrups similar to outer conductor structure, but square stirrup section length and cut
Face is wide longer than outer conductor stirrup section and section is wide small.
Embodiment 3.
Referring to accompanying drawing 4,5,6.
No matter which kind of shape tested one-dimensional concrete section is, there is inside and outside two conductor in one-dimensional concrete, axle center is
Inner wire.The present invention is connected on the test interface of detecting instrument using the inner wire and outer conductor of the one-dimensional concrete of coaxial cable
Tested.Detecting instrument is respectively step test instrument and vector network analyzer, the test interface bag of vector network analyzer
Include port one and port two.
When being tested using step test instrument, the inner wire and outer conductor of one-dimensional concrete one end are connected to step test instrument
Step generator test interface on, tested according to the method for reflected signal delay.Under microprocessor control, rank
Jump signal generator sends periodic step signal, and signal frequency is less than 1 megahertz.
Signal amplification circuit amplifies the signal of test interface, and the signal after amplification passes through analog to digital conversion circuit by analog signal
Switch to give microprocessor after data signal.Microprocessor can be digital signal processing circuit DSP, can also be that scene can be compiled
Journey gate array FPGA.This example employs on-site programmable gate array FPGA.Microprocessor is as follows to data handling procedure：
1) absolute value of adjacent data difference, is calculated；
2) the absolute value sum of multiple adjacent datas difference, is calculated, when the absolute value sum more than one first passes through experiment in advance
When the threshold value of determination and the maximum for the absolute value sum value of periphery adjacent data difference, when there is the sampling of the value in record
Carve, and be transition point by the moment definition；
3), judge that step signal sends the time, it is step signal starting point to determine some transition point：Originated with step signal
The different transition point of point is signal reflex point, when signal reflex point number is more than or equal to 2, judges that one-dimensional concrete has damage；
4), when signal reflex point number is more than or equal to 2, the mould between signal reflex point and step signal starting point is calculated
Number conversion sampling numbers, the sampling number be multiplied by the sampling period and divided by 2 be exactly signal reflex point and step signal starting point it
Between light velocity propagation time t, be multiplied by the light velocity with time t, obtain signal reflex point to the distance between step signal starting point, this
The distance between distance is exactly impaired loci or the detected concrete other end to test interface.Number is damaged by the output of microprocessor
According to just can in good time, effectively testing out detected concrete quality.
Have when being tested referring to Fig. 5 using vector network analyzer and be divided into two kinds, the port one of vector network analyzer is connected
On the outer conductor and inner wire for being connected to detected concrete one end, tested according to time domain S parameter method.
Referring to Fig. 6.The port one of vector network analyzer is connected to the inner wire and outer conductor of detected concrete one end
On, the port two of vector network analyzer is connected on the inner wire and outer conductor of the detected concrete other end, according to a variety of S
Parametric technique is tested.
The present embodiment employs Agilent 8719ES vector network analyzers.
When using vector network analyzer, when being tested according to time domain S parameter method, using vector analysis instrument time domain S11
Parameter is tested, and analyzes number and the reflection interval of pip.If pip number is more than or equal to 2, illustrate detected concrete
There is exception；Be multiplied by with reflection interval the light velocity and divided by 2, obtain signal reflex point to the distance between vector network analyzer port,
This distance is exactly the distance of impaired loci or the detected concrete other end to vector network analyzer port one.
, it is necessary to first test and detected concrete when being tested using vector network analyzer according to a variety of S parameter methods
Multiple frequency domain parameters of structure and the healthy concrete of specification identical, then it is corresponding with the corresponding measurement port of detected concrete
Frequency domain parameter is contrasted, and draws test result.The process of test is：
1), it is defined as contrasting concrete with detected concrete structure and the healthy concrete of specification identical, by vector network
The port one of analyzer is connected on the inner wire and outer conductor of contrast concrete one end, and the port two of vector analysis instrument is connected
Onto the inner wire and outer conductor of the contrast concrete other end, frequency domain S11, S12, S21, the S22 parameter of test comparison concrete,
These parameters are calculated as SA11, SA12, SA21, SA22；
2), the port one of vector network analyzer is connected on the inner wire and outer conductor of detected concrete one end, will
The port two of vector analysis instrument is connected on the inner wire and outer conductor of the detected concrete other end, tests the frequency of detected concrete
These parameters are calculated as SB11, SB12, SB21, SB22 by domain S11, S12, S21, S22 parameter；
3), respectively reduced parameter SA11 and parameter SB11, parameter SA12 and parameter SB12, parameter SA21 and parameter SB21,
Difference between parameter SA22 and parameter SB22, if parameter is different, judges that detected concrete has damage.
Embodiment 4.
Referring to Fig. 3.Step test instrument is by step generator 5, signal amplification circuit 6, analog to digital conversion circuit 7, Wei Chu
Reason device 8 is constituted.The output end of step generator 5 connects the input of signal amplification circuit 6, the mould of analog to digital conversion circuit 7
Plan input is connected to the amplification output end of signal amplification circuit 6, the numeral output of analog to digital conversion circuit 7 and is connected to microprocessor
On 8 data-interface, microprocessor is connected with step generator, and the step signal of control step generator is produced.
Microprocessor can use on-site programmable gate array FPGA, or digital signal processing circuit DSP.The present embodiment
Using on-site programmable gate array FPGA.
Referring to Fig. 7~17.
In step generator circuit diagram in Fig. 7 step test instrument, U7:TS5A4596；U8:TS5A4597 is by the U.S.
TEXAS INSTRUMENTS companies produce.
In signal amplification circuit figure in Fig. 8 step test instrument, U4：AD8045, it is public by U.S. ANALOG DEVICES
Department's production.
Fig. 9~11 are D/A converting circuits in step test instrument, wherein, in Fig. 9 analog-to-digital conversion clock driver circuit figures,
U3:Crystal oscillator.
In Figure 10 analog signal input difference drive circuits, U6：ADA493, is given birth to by ANALOG DEVICES companies of the U.S.
Production.
Figure 11 D/A converter modules U5：AD9643, is produced by ANALOG DEVICES companies of the U.S..
In this example, the microprocessor in step test instrument uses on-site programmable gate array FPGA.Figure 12~Figure 17 is provided
Using the circuit diagram of on-site programmable gate array FPGA.In figure, U1：XC3S1200, U2：XCF04, the life of Xilinx companies of the U.S.
Production.
Claims (7)
1. a kind of one-dimensional concrete health monitor method of reinforcing bar coaxial cable structure, it is characterised in that：Method of testing is based on reinforcing bar
The one-dimensional concrete of cCoax construction, one-dimensional concrete has inside and outside two conductor, and axle center is inner wire, and outer conductor is by around interior
The stirrup of conductor and vertical muscle construction are formed, and the construction of outer conductor is identical with existing one-dimensional concrete construction, will be coaxial based on reinforcing bar
Two ends are connected to detecting instrument by the inner wire of one-dimensional concrete of cable construction and one end in the two ends of outer conductor simultaneously
Test interface on tested；Detecting instrument is respectively step test instrument and vector network analyzer；
When being tested using step test instrument, the inner wire and outer conductor of one-dimensional concrete one end are connected to the test of step test instrument
On interface, tested according to the method for reflected signal delay；
It is divided into two kinds using the method for testing of vector network analyzer, the port one of vector network analyzer is connected to tested mixed
On the outer conductor and inner wire of solidifying soil one end, tested according to time domain S parameter method；By the port one of vector network analyzer
On the inner wire and outer conductor for being connected to detected concrete one end, the port two of vector analysis instrument is connected to detected concrete another
On the inner wire and outer conductor of one end, tested according to a variety of S parameter methods；
According to the method for testing of reflected signal delay when being tested using step test instrument：Under micro-processor control, step signal
Generator sends periodic step signal, and signal frequency is less than 1 megahertz, and signal amplification circuit amplifies the letter of test interface
Number, the signal after amplification gives microprocessor, microprocessor after analog signal is switched to data signal by analog to digital conversion circuit
Data are handled, test result is drawn；
Tested using vector network analyzer according to time domain S parameter method：With vector analysis instrument time domain S11Parameter is surveyed
Amount, analyzes number and the reflection interval of pip, draws test result；
Tested using vector network analyzer according to a variety of S parameter methods：First test and detected concrete structure and specification
Multiple frequency domain parameters of identical health concrete, the corresponding frequency domain parameter of the corresponding measurement port of re-test detected concrete,
The corresponding test parameter of detected concrete and the corresponding measurement port of healthy concrete is contrasted, test result is drawn.
2. the one-dimensional concrete health monitor method of reinforcing bar coaxial cable structure as claimed in claim 1, it is characterised in that：Use
Step test instrument is according to the method for testing of reflected signal delay, and detailed process is：Under microprocessor control, step generator hair
Go out periodic step signal, signal frequency is less than 1 megahertz, and signal amplification circuit amplifies the signal of test interface, after amplification
Signal give microprocessor after analog signal is switched to data signal by analog to digital conversion circuit under the fixed sampling period
Data are handled, process is as follows：
1) absolute value of adjacent data difference, is calculated；
2) the absolute value sum of multiple adjacent data differences, is calculated, is determined when the absolute value sum is more than one beforehand through experiment
Threshold value and during the maximum for the absolute value sum value of periphery adjacent data difference, there is the sampling instant of the value in record, and
It is transition point by the moment definition；
3), judge that step signal sends the time, it is step signal starting point to determine some transition point：With step signal starting point not
Same transition point is signal reflex point, when signal reflex point number is more than or equal to 2, judges that one-dimensional concrete has damage；
4), when signal reflex point number is more than or equal to 2, the modulus calculated between signal reflex point and step signal starting point turns
Sampling number is changed, the sampling number is multiplied by the sampling period simultaneously divided by 2 be exactly light between signal reflex point and step signal starting point
The time t that speed is propagated, is multiplied by the light velocity with time t, obtains signal reflex point to the distance between step signal starting point, this distance
The distance between be exactly impaired loci or the detected concrete other end to test interface.
3. the one-dimensional concrete health monitor method of reinforcing bar coaxial cable structure as claimed in claim 1, it is characterised in that：Use
Vector network analyzer, is to use vector analysis instrument time domain S when being tested according to time domain S parameter method11Parameter is surveyed
Examination, analyzes number and the reflection interval of pip；If pip number is more than or equal to 2, illustrate that detected concrete has exception；If anti-
Exit point number be more than or equal to 2, be multiplied by respectively with the reflection interval of each pip the light velocity and divided by 2, obtain the pip to swear
The distance between Network Analyzer port is measured, this distance is exactly impaired loci corresponding with pip or the detected concrete other end to swearing
Measure the distance of Network Analyzer port one.
4. the one-dimensional concrete health monitor method of reinforcing bar coaxial cable structure as claimed in claim 1, it is characterised in that：Use
Vector network analyzer, be according to the process of a variety of S parameters test：
1), it is defined as contrasting concrete with detected concrete structure and the healthy concrete of specification identical, by vector network analysis
The port one of instrument is connected on the inner wire and outer conductor of contrast concrete one end, and the port two of vector analysis instrument is connected to pair
Than on the inner wire and outer conductor of the concrete other end, frequency domain S11, S12, S21, the S22 parameter of test comparison concrete, by this
A little parameters are calculated as SA11, SA12, SA21, SA22；
2), the port one of vector network analyzer is connected on the inner wire and outer conductor of detected concrete one end, by vector
The port two of analyzer is connected on the inner wire and outer conductor of the detected concrete other end, tests the frequency domain of detected concrete
These parameters are calculated as SB11, SB12, SB21, SB22 by S11, S12, S21, S22 parameter；
3), difference reduced parameter SA11 and parameter SB11, parameter SA12 and parameter SB12, parameter SA21 and parameter SB21, parameter
Difference between SA22 and parameter SB22, if parameter is different, judges that detected concrete has damage.
5. the one-dimensional concrete health monitor method of reinforcing bar coaxial cable structure as claimed in claim 1, it is characterised in that：It is described
One-dimensional concrete has inside and outside two conductor, and axle center is inner wire, and its inner wire is according to the method using a reinforcing bar, or use
The mode that the stirrup similar with outer conductor structure, vertical muscle are combined is made, and for circular stirrups section, the stirrup section of inner wire is straight
Footpath is necessarily less than the stirrup diameter of section of outer conductor, and for square stirrup section, the length and width in the stirrup section of inner wire are necessary
Less than the length and the width in stirrup section in the stirrup section of outer conductor；Outer conductor uses reinforcing bar, is combined into by stirrup, vertical muscle one-dimensional mixed
The outer ring of soil is coagulated, as outer conductor, the construction of outer conductor is identical with the reinforcement constitution of existing one-dimensional armored concrete.
6. the step that a kind of one-dimensional concrete health monitor method of reinforcing bar coaxial cable structure as claimed in claim 1 is used is surveyed
Try instrument, it is characterised in that：Step test instrument is by step generator (5), signal amplification circuit (6), analog to digital conversion circuit
(7), microprocessor (8) is constituted, and the output (9-1,9-2) of step generator (5) is connected to the defeated of signal amplification circuit (6)
Enter end, the simulation input of analog to digital conversion circuit (7) is connected in the output of signal amplification circuit (6), and analog-digital converter is changed
To data signal be conveyed to microprocessor, microprocessor is connected with step generator, control step signal generation.
7. step test instrument as claimed in claim 6, it is characterised in that：The microprocessor (8) is field-programmable gate array
Arrange FPGA, or digital signal processing circuit DSP.
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| CN105974205B (en) * | 2016-07-22 | 2018-08-14 | 四川大学 | Coaxial one-dimensional reinforced concrete member concrete dielectric constant measurement device and method |
| CN106154054B (en) * | 2016-07-22 | 2023-04-18 | 四川大学 | Dielectric constant measuring equipment and method for intelligent coaxial one-dimensional reinforced concrete member |
| CN106018486B (en) * | 2016-07-22 | 2018-09-21 | 四川大学 | One-dimensional coaxial reinforced concrete member measuring apparatus and method based on frequency domain reflection |
| CN105973944B (en) * | 2016-07-22 | 2018-07-10 | 四川大学 | One-dimensional coaxial reinforced concrete member measuring apparatus and method based on equivalent circuit |
| 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 |
| CN109145257B (en) * | 2018-09-07 | 2022-07-05 | 国网湖南省电力有限公司 | Dam safety monitoring analysis method based on multi-measuring-point public abnormal time |
| CN109709420B (en) * | 2018-12-27 | 2020-12-01 | 中电科仪器仪表有限公司 | Integrated cable testing method based on vector network analyzer |
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