CN203231994U - Device for determining water content of concrete - Google Patents
Device for determining water content of concrete Download PDFInfo
- Publication number
- CN203231994U CN203231994U CN 201320281189 CN201320281189U CN203231994U CN 203231994 U CN203231994 U CN 203231994U CN 201320281189 CN201320281189 CN 201320281189 CN 201320281189 U CN201320281189 U CN 201320281189U CN 203231994 U CN203231994 U CN 203231994U
- Authority
- CN
- China
- Prior art keywords
- signal generator
- platinum wire
- probe
- amplifier
- wire probe
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The utility model discloses a device for determining the water content of concrete, and the device comprises a phase-locked amplifier, a signal generator, a standard resistance box and a platinum wire probe, wherein the platinum wire probe is connected with the signal generator, the signal generator is connected with the phase-locked amplifier, the phase-locked amplifier is connected with the standard resistance box, and the standard resistance box is connected with the platinum wire probe again so as to form a loop; the platinum wire probe is also connected with the phase-locked amplifier. The device for determining the water content of concrete disclosed by the utility model is implemented by using a harmonic detection technology based a 3omega method; the device is sensitive to weak signal detection, relatively sensitive to water content, and high in measurement precision. The platinum wire probe of the device is long in service life, can be used repeatedly, uneasy to damage and good in insulation, simultaneously can realize the nondestructive testing on samples and has no requirement on the smoothness of the surfaces of the samples, so that the platinum wire probe also can be applied to samples with a porous structure.
Description
Technical field
The utility model relates to concrete determination of moisture technology, specifically, relates to a kind of for the device of measuring the concrete water cut.
Background technology
At present, the common method of concrete determination of moisture mainly comprises contact measurement method such as infrared heating, halogen heating, capacitance method, electric-resistivity method, and the contactless measurement that uses frequency electromagnetic waves, microwave, near infrared ray etc.These measuring methods are at homogeneous heating degree, measuring accuracy, measuring speed, there is advantage separately aspects such as economy, but also have corresponding deficiency, as in the infrared heating heating process focal point being arranged, measure the sample that comes and have the color change, instrument size is relatively large, and is not convenient etc.; Non-contact measurement method need be to material variety, stacks density, quantizes etc. with the multiple factors such as distance of measuring probe.
3 ω measuring technologies based on the harmonic wave Detection Techniques are a kind of thermal conductivity measuring techniques that are closely related with heat-pole method and tropical method.Be widely used in the measurement to the thermal physical property parameters such as thermal conductivity from the nanometer scale material to the body material.1910, Corbino once proposed, and utilized the voltage of two kinds of different frequencies that alternating current produces in material to measure some physical quantitys of material.Slope-3 ω the method for system's proposition first such as Cahill in 1993 test body material thermal conductivity.So far, Institute of Engineering Thernophysics, Academia Sinica furthers investigate 3 ω technology and device thereof.
3 ω methods utilize an elongated tinsel as heater strip simultaneously as temperature sensor, sample be coated on the METAL HEATING PROCESS silk around.When tinsel being applied angular frequency and be the sine-wave current of ω, because tinsel has certain resistance, to tinsel and liquid heating, produce frequency is the temperature wave of 2 ω to the heat that produces because of Joule effect with the frequency of 2 ω.For simple metal, the rising of temperature increases resistance, and the changes in resistance frequency of increase also is 2 ω, and the resistance of increase and frequency are that the alternating current acting in conjunction generation frequency of ω is the voltage of 3 ω.This 3 ω voltage signal is relevant with the heat wave transmittability of sample, the sample that water cut is different, and the ability difference of transmission heat wave, the 3 ω voltage signals that produce are also different.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of for the device of measuring the concrete water cut.This device is based on harmonic wave Detection Techniques 3 ω methods, and to the liquid water content sensitivity, the measuring accuracy height can be realized the sample Non-Destructive Testing.
For achieving the above object, the utility model adopts following technical scheme:
A kind of for the device of measuring the concrete water cut, comprise lock-in amplifier, signal generator, standard resistance box and platinum filament probe; Described platinum filament probe connects signal generator, and signal generator connects lock-in amplifier, and lock-in amplifier connects standard resistance box, and standard resistance box connects the platinum filament probe again and forms loop; The platinum filament probe also connects lock-in amplifier simultaneously.
For the device of measuring the concrete water cut, the effect of lock-in amplifier is to isolate first-harmonic and harmonic signal above-mentioned; The effect of signal generator is the current signal that can produce at least two fixed frequencies; The effect of standard resistance box is the resistance of leveling probe.
For the device of measuring the concrete water cut, described platinum filament probe comprises two copper foils, metal platinum heater strip and dielectric polyimide film above-mentioned.Two parallel placements of copper foil, metal platinum heater strip are located between two copper foils and are connected two copper foils; Two copper foils and metal platinum heater strip are encapsulated between the two-layer dielectric polyimide film.
The utility model adopts the principle of 3 ω methods to be: the sample that water cut is different, the ability difference of transmission heat wave.Along with the change of input current angular frequency, the response of 3 ω voltage signals is also different, so the 3 ω response signals of demarcating different in moisture content sample, measures 3 ω voltage signals of testing sample then, and reference standard signal collection of illustrative plates can be learnt the moisture of sample.
Compared with prior art, the utlity model has following beneficial effect:
1. the device of mensuration concrete water cut of the present utility model is based on 3 ω methods of harmonic wave Detection Techniques, and this device is to the Detection of Weak Signals sensitivity, and is relatively more responsive to liquid water content, the measuring accuracy height.
The platinum filament probe long service life of this device, can reuse, not fragile, insulate, no longer sample surfaces is had smooth requirement when can realize the sample Non-Destructive Testing, also can use the sample with porous structure.
Description of drawings
Fig. 1 is for being used for measuring the apparatus structure synoptic diagram of concrete water cut.
Embodiment
As shown in Figure 1, a kind of for the device of measuring the concrete water cut, comprise lock-in amplifier 1, signal generator 2, standard resistance box 3 and platinum filament probe 4; Platinum filament probe 4 comprises two copper foils 41, metal platinum heater strip 42 and dielectric polyimide film 43.Two copper foil 41 parallel placements, metal platinum heater strip 42 are located between two copper foils 41 and are connected two copper foils 41; Two copper foils 41 and metal platinum heater strip 42 are encapsulated between the two-layer dielectric polyimide film 43.Metal platinum heater strip 42 1 ends of platinum filament probe 4 connect signal generator 2, and signal generator 2 connects lock-in amplifier 1, and lock-in amplifier 1 connects standard resistance box 3, and the other end that standard resistance box 3 connects platinum filament probe 4 metal platinum heater strips again forms loop; Two copper foils 41 of platinum filament probe 4 connect lock-in amplifier 1 again.
During work: the first step prepares platinum filament probe 4.The thick Kapton of a slice 25 μ m is through tiling behind the ultrasonic cleansing and be fixed on the microslide.Platinum heating/the detector of the about 200nm of one bed thickness is deposited on two Copper Foil pads by uv-exposure and photoetching process.Two leads are fixed on two pads by welding technology.The Kapton that another sheet one side scribbles hot melt adhesive covers by heat pressing process and makes its sealing on the platinum detector.
Second step was fixed to platinum filament probe 4 in the sample, connected instrument.Prepare following three samples: 1. former state: 100g cement+14g water; 2. add 5% water: 100g cement+14.7g water; 3. add 10% water: 100g cement+15.4g water.Before beginning test, between two identical samples, the test structure that the three constitutes is positioned on the sample fixed station with Probe clip.
The instrument initialization of the 3rd step.Experiment beginning allows the voltage of a 10mV of conditioning signal generator output, converts small alternating current to through current conversion module and comes the platinum filament that encapsulates in the heated probe.In detail using method is with reference to people's such as Tang of Institute of Engineering Thernophysics, Academia Sinica David utility model: the harmonic wave Detection Techniques are measured the device of liquid thermal conductivity factor and thermal diffusivity.
The resistance of the 4th step ordinary telegram.Regulate the reading of resistance in series case, make the resistance of resistance box be approximately equal to the initial resistance of probe, then the output voltage of signal generator is adjusted to 5V.
The 5th pacing amount harmonic signal.To the electric current of heater strip input 0.1 ~ 1000Hz frequency range, third harmonic voltage and the fundamental voltage at record probe two ends.Nonlinear fitting gets third harmonic (3 ω signal), and with the change curve of input current angular frequency (ω signal), the slope of asking for III section harmonic wave gets signal intensity.Test findings is as follows: former state gets signal intensity and is followed successively by 4.39/3.95/6.82/3.00; Adding 5% water sample gets signal intensity and is followed successively by 6.88/6.94/4.73; Adding 10% water sample gets signal intensity and is followed successively by 7.84/7.34.Here the signal strength values quantity of three samples does not wait and chooses difference by probe location and cause, to not influence of interpretation of result.
Draw the change in signal strength block scheme of three samples of gained, the visible different mortar response signal intensity difference of liquid water content proves that technical solutions of the utility model are feasible.
Claims (2)
1. device of be used for measuring the concrete water cut, its feature is being to comprise lock-in amplifier (1), signal generator (2), standard resistance box (3) and platinum filament probe (4); Described platinum filament probe (4) connects signal generator (2), and signal generator (2) connects lock-in amplifier (1), and lock-in amplifier (1) connects standard resistance box (3), and standard resistance box (3) connects platinum filament probe (4) again and forms loop; Platinum filament probe (4) also connects lock-in amplifier (1) simultaneously.
2. according to claim 1 for the device of measuring the concrete water cut, it is characterized in that described platinum filament probe (4) comprises two copper foils (41), metal platinum heater strip (42) and dielectric polyimide film (43); The parallel placement of two copper foils (41), metal platinum heater strip (42) are located between two copper foils (41) and are connected two copper foils (41); Two copper foils (41) and metal platinum heater strip (42) are encapsulated between the two-layer dielectric polyimide film (43).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320281189 CN203231994U (en) | 2013-05-22 | 2013-05-22 | Device for determining water content of concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320281189 CN203231994U (en) | 2013-05-22 | 2013-05-22 | Device for determining water content of concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203231994U true CN203231994U (en) | 2013-10-09 |
Family
ID=49288114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320281189 Expired - Fee Related CN203231994U (en) | 2013-05-22 | 2013-05-22 | Device for determining water content of concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203231994U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267776A (en) * | 2013-05-22 | 2013-08-28 | 中山大学 | Method and device for measuring concrete moisture content |
| CN108956684A (en) * | 2018-07-28 | 2018-12-07 | 哈尔滨工业大学 | A kind of embedded type concrete early freezc icing lossless detection method |
-
2013
- 2013-05-22 CN CN 201320281189 patent/CN203231994U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267776A (en) * | 2013-05-22 | 2013-08-28 | 中山大学 | Method and device for measuring concrete moisture content |
| CN108956684A (en) * | 2018-07-28 | 2018-12-07 | 哈尔滨工业大学 | A kind of embedded type concrete early freezc icing lossless detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104677927B (en) | Distribution transformer winding wood properly test system and method | |
| CN101907589B (en) | Harmonic micrometer/nanometre film thermal property test method | |
| CN103499404B (en) | Ferromagnetic component alterante stress measurement mechanism and measuring method thereof | |
| CN101782541B (en) | Method and device for testing thermal physical property of solid material with independent probe by using harmonic method | |
| CN107655940B (en) | Transformer winding material detection equipment and system | |
| CN102313758B (en) | Device and method for measuring heat storage coefficient of material by harmonic method based on independent sensor | |
| CN101825592B (en) | Method and device for testing thermal physical property of single conductive filamentary material by using harmonic method | |
| CN102279204A (en) | Detection method for thermal conductivity and thermal diffusivity of anisotropic material | |
| CN104198537A (en) | Method and device for detecting moisture content and electric conductivity of soil | |
| CN103344790B (en) | A kind of device based on scanning calorifics microscope in-situ characterization nanometer thermoelectric Seebeck coefficient | |
| CN107687909A (en) | A kind of cable temperature monitoring system based on Intelligent internet of things | |
| CN203231994U (en) | Device for determining water content of concrete | |
| CN107843618A (en) | Consider the distribution transformer winding material discrimination device and method that conducting rod material influences | |
| CN201535761U (en) | Harmonic method solid material thermal physical property test device with independent probe | |
| CN103499604A (en) | Device and method for testing heat conductivity coefficient of composite honeycomb plate | |
| CN101871900A (en) | Sensor for measuring heat conduction coefficient | |
| CN204514832U (en) | Substation transformer winding wood properly test system | |
| CN201041558Y (en) | Device for detecting liquid heat conduction coefficient and thermal diffusion rate based on harmonic wave detection technology | |
| CN106706700A (en) | Online monitoring system and method for phase change-resistance relation of conductive polymer composite material | |
| CN105784758A (en) | Fiber heat conductivity determination method | |
| CN203587535U (en) | Device for measuring soil thermophysical parameters by adopting double-probe method | |
| CN108956686A (en) | A kind of measurement method of the real-time heat output of irregular solid wall surface | |
| CN103267776A (en) | Method and device for measuring concrete moisture content | |
| CN107621477A (en) | A kind of Harmonic Method hydrogel testing device for measuring thermal conductivity and method | |
| CN104374494A (en) | Packaging structure for thermistor temperature coefficient calibration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20131009 Termination date: 20160522 |