CN103472127B - Unsaturated soil soil water characteristic Quantitative detection sensor and application thereof - Google Patents
Unsaturated soil soil water characteristic Quantitative detection sensor and application thereof Download PDFInfo
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Abstract
Unsaturated soil soil water characteristic Quantitative detection sensor of the present invention, be arrange pickup coil in one end of the shell of complete water-tight, the other end arranges the terminal box comprising power input and detection signal output terminal; AC/DC change-over circuit and subsequent CV are set in shell, add by ACVG model calling that IA forms and add by acv/dcv the module that VA forms; Acv/dcv connects detection signal output terminal; The alternating current that 100MHz connected by this sensor in pickup coil produces the AC magnetic field of a high stability, micro-superfine, then activates native water-band charged particle in unsaturated soil and makes it polarization, thus form microelectronics electric current, and detected by testing circuit.Can be used for indoor and field condition real-time monitored.There is the advantages such as quick, sensitive, error is little, volume is little.
Description
Technical field
The present invention relates to the detection technique of unsaturated soil soil water characteristic, be specially a kind of unsaturated soil soil water characteristic Quantitative detection sensor and application thereof.
Technical background
The soil great majority run in large-scale construction project process are in unsaturated state, and unsaturated soil is solid-liquid-gas three-phase composite medium, and its engineering properties is very complicated.In recent years, unsaturated soils theory theory is widely applied in Slope Stability Evaluation and rain-induced landslide prediction etc., and soil―structure interaction plays an important role in unsaturated soils theory, (1) soil―structure interaction is combined with horizontal soil column permeability test data, the infiltration coefficient of unsaturated soil can be calculated; (2) mathematical model of soil―structure interaction is one of constitutive relation of unsaturated soil; (3) unearthed intensity, distortion and infiltration coefficient can be estimated with soil―structure interaction.Therefore, soil―structure interaction (SWCC) causes the concern of numerous scholar as the basic test content of unsaturated soil theoretical research.There is scholar's development and application can measure the suction sensor of high suction value.Although these Fundamentals of Sensors are similar, when sensor itself is different, the method for testing adopted is also different, needs to design according to actual test condition.The method of present analysis unsaturation soil suction mainly contains direct method and indirect method two kinds, and conventional direct method has been summed up hygrometer, tensiometer, pressure plate apparatus etc., and indirect method has thermal conductivity sensors, filter paper method etc.For water cut observation, conventional method comprises in-situ test-namely directly measured by in-situ sampling, volumetric water content probe measures and other indirect measurement methods, as neutron moisture teller, gamma-rays mensuration etc.
, on engineering uses, all there is place not fully up to expectations in said method.As the hygrometer method in direct measuring, shortcoming is: the equipment of calibration, measurement is all more complicated, high to environmental requirement, cannot be used for field measurement; The suction value lower than 100kPa cannot be surveyed; Thermopair is perishable in sour environment, each calibration or use after, must by producer explanation measure cleaning; The result measured with unclean or underproof hygrometer is difficult to analyze.Same tensiometer method also has shortcoming, such as: (1) request for utilization is high: once occur that air will make the measuring pore water pressure of closed system make mistakes in measurement system, so guarantee in tensiometer pipe most important without air all the time.Before using, must guarantee that ceramic head is without blocking, free from flaw, then remove the air in tensiometer as much as possible, and by the ceramic head of tensiometer and the plastic tube water saturation of removing air.Surface seismic records to pressure gauge reading must carry out potential head correction according to the water colunm height in tensiometer pipe.(2) use limitation: the ceramic head of a. tensiometer must contact well with soil, to guarantee soil water and tensiometer Guan Zhongshui continuously, but this point (time especially in the wild) is not easily determined.B. ceramic head is more fragile, easy to crack, once cracking just can not be used again.C. measurement range can by the restriction of " cavitation erosion " phenomenon: when pore water pressure is close to when bearing an atmospheric pressure, water can gasify, and makes air inlet in measurement system and cannot correct reading.Visible, the absolute value of the negative pore water pressure measured with tensiometer can not more than a standard atmospheric pressure.D. measuring range also can be subject to the restriction of the air-entry value of ceramic head: ensure that the air-entry value of ceramic head must be greater than matric suction to be measured, otherwise air will through ceramic wafer inlet examining system.And pressure plate apparatus, shortcoming is: when a. adopts axial translation technology to carry out test of long duration, is difficult to ensure do not have bubble all the time in water pressure measurement system: because the coefficient of permeability of soil sample and high air-entry value ceramic wafer is all lower, equilibration time is often longer.Interstitial air may be spread by the water in high air-entry value ceramic wafer during this period, and under appearing at ceramic wafer with bubble regime, makes surveyed matric suction on the low side.B. the air-entry value of ceramic wafer and the maximum diameter of hole of plate are inversely proportional to, and infiltration coefficient is large and become large with the change of panel aperture.This those weak contradictions strong are had between the air-entry value of ceramic wafer and infiltration coefficient.
For the thermal conductivity sensors method in indirect measuring technology, its shortcoming is: a. thermal conductivity sensors ceramic head makes and uses all has particular/special requirement.B. thermal diffusion makes probe radially have thermograde and produces temperature stress, and Long-Time Service easily produces crack; Infiltration coefficient because of soil reduces with water cut and reduces, and the equilibration time surveying sensor during high suction is longer; Can not measure continuously, in real time: once measure data complete, just can measure operation after the temperature rise at probe middle part need be waited to recover back to zero, otherwise the basic condition of each thermal diffusion be different next time.And filter paper method, its shortcoming is: must be noted that the difference distinguishing noncontact filter paper method and contact last time when a. uses, and the former is suitable for the high suction value surveying >100kPa, and the latter comparatively should be used for measuring bargain-hunting power.That measures in addition is likely total suction, instead of matric suction.Also have filter paper must be dustless quantitative test II type filter paper (meeting ASTME832 standard), require very high.B. need precision to be the instrument such as the high-precision balance of 0.0001 gram and baking oven when measuring equilibrium moisture content, thus must experiment indoor take from field original state or disturbed sample carry out.C. use limitation obvious, being difficult to robotization, is all manual operation at present, especially requires very high in data acquisition phase to artificial technology, and result is very large by the impact of operating personnel and laboratory condition, and order of accuarcy is difficult to ensure; Equilibration time is longer, and equilibration time generally needs 7 ~ 10 days; If be initially wet filter paper, then generally need 21 ~ 25 days.D. the Water storage characteristics of filter paper material may affect high suction force range.For contact last time, be difficult to the good contact ensureing filter paper and soil sample.
Except above method, also scholar is had to adopt time domain reflection technology (TDR), in this technical method, the specific inductive capacity of soil is not only with the change of moisture content of the soil body, also by the impact of soil body density, temperature, salt content, mineralogical composition etc., wherein the having the greatest impact to rating curve with the particle size of soil and bulk density.In addition, condenser type suction instrument is applicable to measuring below 200kPa suction, but needs to consider the impact of electrolyte soluble in water on sensor output value.
Along with the capital construction and slope and land slide Prevention technology etc. of heavy construction need more and more to be subject to people's attention, wish to study a kind of easy, easy pick-up unit as early as possible, this device should be able to grasp the native water characteristic of unsaturated soil quickly and accurately, uses with satisfied indoor and field engineering.
Summary of the invention
An object of the present invention is to provide a kind of unsaturated soil soil water characteristic Quantitative detection sensor.
Unsaturated soil soil water characteristic Quantitative detection sensor of the present invention, comprises the pickup coil for detecting soil sample water cut, ACVG, IA, acv/dcv, VA, AC/DC, CV;
Often organizing pickup coil is two coil L1 of formation mutual coupling effect and combining of coil L2 nested together, and its coil L1 is the magnetizing coil producing main field, and coil L2 is the tickler extracting the change of microelectronics stream;
ACVG adds the IA connecting coil L1 in the module of IA composition, forms the AC magnetic field circuit that the frequency making determinand be excited to produce microelectronics stream is 100MHz, intensity is 1 ~ 10 micro-tesla, degree of stability is ± 0.5 micro-tesla;
Acv/dcv adds the VA connecting coil L2 in the module of VA composition, forms the testing circuit detecting the microelectronics stream change that determinand is excited to produce;
One end of the shell of complete water-tight arranges pickup coil, and the other end arranges the terminal box comprising power input and detection signal output terminal; AC/DC change-over circuit and subsequent CV are set in shell, add by ACVG model calling that IA forms and add by acv/dcv the module that VA forms; Acv/dcv connects detection signal output terminal;
Wherein, AC/DC: ~ 220V-50Hz AC/DC power circuit;
CV: constant voltage 12V circuit;
ACVG: high-frequency voltage signal generator circuit;
IA: high-frequency current constant-current circuit;
VA: microelectronics stream voltage amplifier circuit;
Acv/dcv: high-frequency signal voltage turns direct-flow signal voltage circuit.
Be square or circular at the indoor type sensor of indoor use, pickup coil is hollow, and the outdoor type sensor used in the wild is circle, and pickup coil is totally enclosed.
In order to carry out the contrast of dry ground wet soil, at indoor type sensor setting two duplicate pickup coils of indoor use.One carries intrinsic moisture residual for the dry ground sample detecting censorship, another moisture variable quantity of soil sample for detecting censorship.
In order to electricity consumption is convenient, probe power input end setting ~ 220V-50Hz interface and+12V interface; AC/DC change-over circuit in ~ 220V-50Hz interface connected with outer casing and subsequent constant voltage 12V circuit CV.
Sensor of the present invention, its coil is around the toroidal winding on hollow skeleton, its rear external diameter 12mm that is shaped, internal diameter 5mm, length 10mm, inductance value are 0.5nH ~ 100 μ H, the material of hollow skeleton is nonconducting nonmetallic pipe, is selected from quartz glass tube, ceramic pipe and polytetrafluoroethylplastic plastic pipe.
Another object of the present invention is to provide the application process of unsaturated soil soil water characteristic Quantitative detection sensor.
The method is divided into indoor detection and field to detect,
Indoor detection key step comprises:
1) tested sample is prepared;
2) the indoor type sensor used, the working power voltage of experimental provision is 12VDC, makes the charge dipole muon polarization excitation field initial frequency in tested sample be set as 100MHz;
3) two same are respectively charged in two coils by test agent;
4) injected pure water to one of them pickup coil by test agent, the sample in another pickup coil does not add pure water;
5) change of moisture content value is recorded, until reached balance, till the magnitude of voltage namely recorded is constant by the water cut of test agent is saturated;
6) according to the magnitude of voltage that the type of soil measures, this soil's water content is obtained from the calibration normative reference of pre-rendered magnitude of voltage ~ water percentage relation;
Field is detected key step and is comprised:
1) hole at slight slope;
2) outdoor type sensor is imbedded in hole, pickup coil faces down, and is close to soil layer, then with soil, compacting is filled up in hole;
3) simulate rainmaking, water to the slight slope burying sensor underground;
4) change of moisture content value is recorded, until reached balance, till the magnitude of voltage namely recorded is constant by the water cut of test agent is saturated;
5) according to the magnitude of voltage that the type of soil measures, this soil's water content is obtained from the calibration normative reference of pre-rendered magnitude of voltage ~ water percentage relation.
Indoor detecting step 1) be first that the silt crossing 2mm sieve is loaded in pickup coil, then hit real compact formed.Its physical dimension is the right cylinder of diameter 5mm, high 10mm.In specific implementation process, also step 1) and step 3) can be merged, directly will be loaded in pickup coil with powdery by test agent, hit reality, and ensure certain earth pillar height, more can save trouble like this, and prefabricated tested sample can be avoided due to change in size to put to enter situation in pickup coil.
At indoor detecting step 5) each a minute record change of moisture content value.
Detecting step 1 in the wild), bore size is that diameter at least equals outdoor type sensor external diameter, the degree of depth at least equals outdoor type sensor length.
Detecting step 4 in the wild) each a minute record change of moisture content value.
Under alternating electromagnetic field action, produce the principle of microelectronics stream effect according to different minerals matter in unsaturated soil, unsaturated soil is placed in ac magnetic field, detect the variable quantity of microelectronics stream, obtain the attribute of native liquid water content and soil in unsaturated soil thus.
The unsaturated soil soil water characteristic fast quantitative measurement method for detecting of invention design is that unsaturated soil is sieved to be loaded in this pickup coil, forms right cylinder in fact through hitting; The alternating current connecting 100MHz in pickup coil produces the AC magnetic field of a high stability, micro-superfine, then activates native water-band charged particle in unsaturated soil and makes it polarization, thus form microelectronics electric current.Find that microelectronics strength of current size is relevant with water cut with unsaturated soil character through experiment, by high-sensitivity detection sensor, microelectronics current conversion is become d. c. voltage signal.Finally draw native liquid water content in sample according to the voltage variety exported.
ACVG adds the IA connecting coil L1 in the module of IA composition, the AC magnetic field circuit formed, for generation of the AC magnetic field of the high-frequency that frequency is 100MHz, intensity is 1 ~ 10 micro-tesla, degree of stability is ± 0.5 micro-tesla, high stability, micro-superfine, activate native water-band charged particle in unsaturated soil and make it polarization and form microelectronics electric current.
Acv/dcv adds the VA connecting coil L2 in the module of VA composition, forms the testing circuit detecting the microelectronics stream change that determinand is excited to produce, for microelectronics current conversion is become d. c. voltage signal, and detects.
The silt detected by emphasis, clay make right cylinder successively as sample, the analog voltage that the unsaturated soil obtaining certain water percentage exports at this AC magnetic field effect lower sensor, i.e. the calibration normative reference of certain unsaturated soil;
By the magnitude of voltage of testing sample and standard model voltage compare, the analog voltage increment according to correspondence obtains its content;
The native liquid water content of various unsaturated soil and the impact of sensor output voltage increment are proportion relation, obtain a kind of voltage increment of native liquid water content of unsaturated soil, can pick out the native liquid water content of this unsaturated soil corresponding to this voltage increment.
Unsaturated soil soil water characteristic Quantitative detection sensor of the present invention, there is the physical quantity that the electronic switch that the materials such as Tu Shui carry can be become microelectronics electric current, then according to the physical quantity intensity size of electricity, unsaturated soil testing sample soil water characteristic variations rule and rapid verification soil liquid water content is reflected.Can be used for indoor and field condition real-time monitored.
Advantage of the present invention is: 1), not need sample pre-treatments, and direct injected detects, and detects consuming time short; 2), the output of sensor is d. c. voltage signal, highly sensitive, error is little, the linearity and reproducible, and experiment proves to detect reappearance: ± 1.5%, relative error: ± 1.5%.3), can be directly online with watch-dog, be easy to realize high speed on-line real time monitoring and control; 4), antijamming capability strong, can normally work in the presence of a harsh environment; 5), this sensor bulk is little, Installation and Debugging convenient, simple to operate, cost performance is high.
Accompanying drawing explanation
Fig. 1 is unsaturated soil of the present invention soil water characteristic Quantitative detection sensor construction schematic diagram; Wherein a is the contour structures of indoor type sensor; B is a inner structure; C is the contour structures of outdoor type sensor; D is c inner structure; Mark is expressed as: 1-indoor type pickup coil, 2-outdoor version pickup coil, the input of 3-power supply and detection signal output wiring box, 4-shell; 5-adds by ACVG the module that IA forms, and 6-adds by acv/dcv the module that VA forms;
Fig. 2 is that sensor electrical principle of the present invention is always schemed;
Fig. 3 the Yellow River silt (0.6g) 4
#, 5
#the time dependent relation of water percentage in sample;
Fig. 4 the Yellow River silt (0.3g) A
#, B
#the time dependent relation of water percentage in sample;
Fig. 5 is that sensor detects the linearity and the repetition rate of reflection to different unsaturated soil Tu Shui;
Fig. 6 is North Sea silty clay field trial result.
Embodiment
Embodiment 1
Indoor type sensor
See Fig. 1 a and Fig. 1 b.Arrange two duplicate pickup coils 1 in one end of the shell 4 of complete water-tight, the other end arranges the terminal box 3 comprising power input and detection signal output terminal; AC/DC change-over circuit is set in shell and subsequent CV(is shown in Fig. 2), add by ACVG module 5 that IA forms and connect and add by acv/dcv the module 6 that VA forms; Acv/dcv connects detection signal output terminal.ACVG adds the IA connecting coil L1 in the module of IA composition, and acv/dcv adds the VA connecting coil L2 in the module of VA composition.Pickup coil 1 is two the coil L1 of formation mutual coupling effect and combining of coil L2 that nest together, and its coil L1 is the magnetizing coil producing main field, and coil L2 is the tickler extracting the change of microelectronics stream.
See Fig. 2.
AC/DC: ~ 220V-50Hz AC/DC power circuit;
CV: high stability, low temperature wave system number, constant voltage 12v circuit;
ACVG: high-frequency voltage signal generator circuit;
IA: high-frequency current constant-current circuit;
VA: voltage amplifier circuit;
Acv/dcv: high-frequency signal voltage turns direct-flow signal voltage circuit.
Sensor is square, and pickup coil 1 is hollow.
Probe power input end setting ~ 220V-50Hz interface and+12V interface; AC/DC change-over circuit in ~ 220V-50Hz interface connected with outer casing 4 and subsequent constant voltage 12v circuit CV.
Coil L1 and coil L2 nests together, and for around the toroidal winding on hollow skeleton, its external diameter 12mm, internal diameter 5mm, length 10mm, inductance value are 0.5nH ~ 100 μ H, and the material of hollow skeleton is polytetrafluoroethylplastic plastic pipe.
Embodiment 2
Outdoor version sensor
See Fig. 1 c and Fig. 1 d.Sensor is circular, and arrange pickup coil 2 in one end of the shell 4 of complete water-tight, pickup coil is totally enclosed.The material of the hollow skeleton of coiling is ceramic pipe.
All the other are identical with embodiment 1.
Application Example 1
Indoor detection
This example is the detection for the Yellow River silt and Guilin red soil soil water characteristic, and key step is as follows:
1 experiment material
Test soil is for taking from the silt of the Huanghe delta and taking from wild goose mountain, Guilin City red clay, and get remoulded sample and cross 2mm sieve, the proportion recording the silt of the Huanghe delta is 2.71; Liquid limit is 22.6, and plastic limit is 14.6.The proportion of wild goose mountain, Guilin City red clay is 2.72; Liquid limit is 47.4, and plastic limit is 26.7.
2 tested sample preparations
Tested sample preparation steps: load in pickup coil by the silt crossing 2mm sieve, hits real compact formed with metal bar.Its physical dimension is diameter 5mm, high 20mm; And diameter 5mm, high 12m two kinds.
3 experimental techniques
3.1 experiment condition
In order to examine or check the feasibility of this method, weight and the water suction total amount of tested sample are known.Its specification has two kinds, as previously mentioned.The working power voltage of experimental provision is 12VDC, makes the charge dipole muon polarization excitation field initial frequency in tested sample be set as 100MHz.
3.2 experimental procedure
1) 0.30g the Yellow River silt sample (right cylinder of diameter 5mm, high 12m) is injected 0.15ml pure water, each a minute record change of moisture content value, until reached balance by the water cut of test agent is saturated.
2) 0.30g the Yellow River silt sample (right cylinder of diameter 5mm, high 12m) is injected 0.10ml pure water, each a minute record change of moisture content value, until reached balance by the water cut of test agent.And then add 0.02ml pure water, continue observation change of moisture content value, each minute record one secondary data, until reached balance by the water cut of test agent.
3) 0.30g Guilin red soil sample (diameter 5mm, high 12m) is injected 0.15ml pure water, each a minute record change of moisture content value, until reached balance by the water cut of test agent is saturated.
4) 0.30g Guilin red soil sample (diameter 5mm, high 12m) is injected 0.10ml pure water, each a minute record change of moisture content value, until reached balance by the water cut of test agent.And then add 0.10ml pure water, continue observation change of moisture content value, each minute record one secondary data, until reached balance by the water cut of test agent.
5) the 0.60g the Yellow River silt sample (diameter 5mm, high 22mm) of densification is injected 0.30ml pure water, each a minute record change of moisture content value, until reached balance by the water cut of test agent is saturated.
6) the 0.60g the Yellow River silt sample (diameter 5mm, high 22mm) of non-densification is injected 0.30ml pure water, each a minute record change of moisture content value, until reached balance by the water cut of test agent is saturated.
4, experimental result
4.1 the Yellow River silt sample water demand ratios comparatively
The Yellow River silt (0.6g) 4
#, 5
#, through pressurize closely knit after, inject 0.30ml pure water, then within every 5 minutes, gather the soil―structure interaction of a secondary data, as shown in Figure 3.Sample 4
#, 5
#at t
0after moment injection 0.30ml pure water, sensor reflects that soil water divides up to be increased, fast to t
15moment enters state of saturation.Because there is residue water to occur above sample, remained unchanged after several minutes, this illustrates that soil water content is saturated.
The Yellow River silt (0.3g) A
#, after closely knit a little, inject the soil―structure interaction of 0.15ml pure water, as shown in Figure 4.As can be seen from Figure 4, when at t
0moment injects 0.15ml pure water, and sensor reflects that soil water divides up to be increased, fast to t
4moment enters state of saturation.Because there is residue water above sample, remained unchanged after several minutes, this illustrates that in soil, water cut is saturated.
The Yellow River silt (0.3g) B
#, after closely knit a little, divide two stages to inject the soil―structure interaction of 0.10ml and 0.02ml pure water respectively, as shown in Figure 4.At t
0after moment injection 0.10ml pure water, sensor reflects that soil water divides up to be increased, fast to t
4moment seems to be tending towards saturated.For confirming correctness, at t
25moment reinjects 0.02ml pure water.During sensor reflection is unearthed, water cut is also continuing toward rising, but at t
34moment starts to decline a little until balance, and has residue water above sample, and this illustrates that in soil, water cut is saturated.
From Fig. 3 and Fig. 4, after water cut reaches capacity in soil, then give sample water filling, sensor sensing value no longer changes with the increase of water.
4.2 sensor performances compare
In sum, curve A in Fig. 4
#be tested sample weight be 0.3g, volume is
the Yellow River silt impose 0.15ml pure water after, As time goes on, the result of each minute record water absorbing capacity change.Curve B # is tested sample weight is 0.3g, volume is
the Yellow River silt, after the pure water not imposing different milliliter number in the same time, As time goes on, the result of each minute record water absorbing capacity change.Wherein, moment t
0to moment t
25impose the change curve of 0.1ml pure water, from t
25-to t
35it is the change curve after executing 0.02ml pure water again.
By A
#the t of curve
3to t
25moment water cut has and obviously fluctuates up and down, B
#the t of curve
3to t
15moment water cut also has and obviously fluctuates up and down.This illustrates, be unstable before water content of soil reaches capacity, this also reflects the difference of suction.From another viewpoint, these two curves also reflect after water cut in the soil body is saturated, and they overlap.This shows that the water cut repeatability that sensor sensing arrives is fine.Also can find out from their linearity curve (Fig. 5), its linearity is fine, and error is very little.
Application Example 2
Field is detected
This example is for North Sea silty clay soil water Characteristics Detection, and key step is as follows:
1, bury underground point selection vertical height be 2 meters, the artificial slight slope of the gradient about 35 degree, be silty clay;
2, hole, 0.050 meter, aperture, the degree of depth 0.30 meter, aperture is vertical with domatic, and liftoff plane orthogonal height 0.5 meter;
3, bury sensor underground, band pickup coil one end down, will be tamped in the earthen backfill of taking-up to hole, and below aperture, wide 0.1 meter a, groove of dark 0.05 meter is opened at 0.1 meter of afterwards;
4, power on to sensor, preheating 2 minutes;
5, simulate rainmaking, water to slight slope, observe change of moisture content in soil;
6, record data, every the output voltage values of 1 minute record primary transducer, until the output voltage values of sensor is constant, stop watering, experiment terminates.
As seen from Figure 6, the output voltage values of sensor becomes good linearity relationship with water cut in soil, and fine at water cut 10 ~ 60% scope internal linear degree, error is very little.
Claims (8)
1. unsaturated soil soil water characteristic Quantitative detection sensor, is characterized in that: comprise the pickup coil for detecting soil sample water cut, ACVG, IA, acv/dcv, VA, AC/DC, CV;
Often organize pickup coil to be combined by two coil L1 forming mutual coupling effect nested together and coil L2, and its coil L1 is the magnetizing coil producing main field, coil L2 is the tickler extracting the change of microelectronics stream;
ACVG adds the IA connecting coil L1 in the module of IA composition, forms the AC magnetic field circuit making determinand excited target produce microelectronics stream; Its frequency is 100MHz, intensity is 1 ~ 10 micro-tesla;
Acv/dcv adds the VA connecting coil L2 in the module of VA composition, forms the testing circuit detecting the microelectronics stream change that determinand excited target produces;
One end of the shell of complete water-tight arranges described pickup coil, and the other end arranges the terminal box comprising power input and detection signal output terminal; AC/DC change-over circuit and subsequent CV are set in shell, are added module that IA forms and acv/dcv by ACVG and add the module that VA forms; Add by ACVG model calling that IA forms and add by acv/dcv the module that VA forms; Acv/dcv connects detection signal output terminal; Power input setting ~ 220V-50Hz interface and+12V interface; AC/DC change-over circuit in ~ 220V-50Hz interface connected with outer casing and subsequent CV;
Wherein, AC/DC: ~ 220V-50Hz AC/DC power circuit;
CV: constant voltage 12v circuit;
ACVG: high-frequency voltage signal generator circuit;
IA: high-frequency current constant-current circuit;
VA: microelectronics stream voltage amplifier circuit;
Acv/dcv: high-frequency signal voltage turns direct-flow signal voltage circuit.
2. sensor according to claim 1, is characterized in that: be square or circular at the indoor type sensor of indoor use, and pickup coil is hollow, and the outdoor type sensor used in the wild is circle, and pickup coil is totally enclosed.
3. sensor according to claim 2, is characterized in that: at indoor type sensor setting two duplicate pickup coils of indoor use.
4. the application process of sensor in unsaturated soil soil water characteristic Quantitative detection of claim 2, is characterized in that: be divided into indoor detection and field to detect,
Indoor detection key step comprises:
1) tested sample is prepared;
2) the indoor type sensor used, the working power voltage of experimental provision is 12VDC, makes the charge dipole muon polarization excitation field initial frequency in tested sample be set as 100MHz;
3) two same are respectively charged in two pickup coils by test agent;
4) injected pure water to one of them pickup coil by test agent, the sample in another pickup coil does not add pure water;
5) change of moisture content value is recorded, until reached balance, till the magnitude of voltage namely recorded is constant by the water cut of test agent is saturated;
6) measure magnitude of voltage according to the type of soil, obtain this soil's water content from the calibration normative reference of pre-rendered magnitude of voltage ~ water percentage relation;
Field is detected key step and is comprised:
1) hole at slight slope;
2) outdoor type sensor is imbedded in hole, soil layer, is close to down in pickup coil one end, then with soil, compacting is filled up in hole;
3) simulate rainmaking, water to the slight slope burying sensor underground;
4) change of moisture content value is recorded, until reached balance, till the magnitude of voltage namely recorded is constant by the water cut of test agent is saturated;
5) measure magnitude of voltage according to the type of soil, obtain this soil's water content from the calibration normative reference of pre-rendered magnitude of voltage ~ water percentage relation.
5. method according to claim 4, is characterized in that: indoor detecting step 1) be that the silt crossing 2mm sieve loads in container, hit real compact formed for physical dimension be the right cylinder of diameter 5mm, high 10mm ~ 22mm; Or step 1) and step 3) are merged, directly will be loaded in pickup coil with powdery by test agent, and hit reality.
6. method according to claim 5, is characterized in that: at indoor detecting step 5) each a minute record change of moisture content value.
7. method according to claim 5, is characterized in that: detecting step 1 in the wild), bore size is that diameter at least equals outdoor type sensor external diameter, the degree of depth at least equals outdoor type sensor length.
8. method according to claim 5, is characterized in that: detecting step 4 in the wild) each a minute record change of moisture content value.
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| JP3500004B2 (en) * | 1996-04-23 | 2004-02-23 | 太平洋セメント株式会社 | Metal detector |
| CN2390203Y (en) * | 1999-09-22 | 2000-08-02 | 黑龙江八一农垦大学 | Electromagnetic wave soil moisture content quick analyser |
| CN103163210B (en) * | 2013-03-06 | 2015-06-24 | 中南大学 | Determinator of water content of concrete |
| CN203465238U (en) * | 2013-08-13 | 2014-03-05 | 欧传景 | Fast quantitative detection sensor for soil-water characteristics of unsaturated soil |
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2013
- 2013-08-13 CN CN201310350132.2A patent/CN103472127B/en active Active
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