CN103604840A - Device for measuring water content of soil and concentration of ion pollutants in centrifuge - Google Patents
Device for measuring water content of soil and concentration of ion pollutants in centrifuge Download PDFInfo
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- CN103604840A CN103604840A CN201310497415.XA CN201310497415A CN103604840A CN 103604840 A CN103604840 A CN 103604840A CN 201310497415 A CN201310497415 A CN 201310497415A CN 103604840 A CN103604840 A CN 103604840A
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Abstract
The invention discloses a device for measuring water content of soil and concentration of ion pollutants in a centrifuge. The device is a hexahedral model casing, a sensor for the same rows and columns are arranged in the two side and behind the model box plate, all sensor POM segment at the bottom of all and the steel wall flush, model the landfill measured soil; each sensor are respectively by the BNC joint by their respective coaxial cable and electromagnetic wave transceiver connected, connected with the electromagnetic wave transceiver and the PC machine, the front model box for organic glass plate. The device into the centrifuge, centrifuge test operation, the soil dielectric constant to determine the water content of the soil, through the test to determine the concentration of pollutants in soil electrical conductivity of soil ion. The invention can realize the scale of soil water content and ion concentration of pollutants in centrifuge test model, is not affected by the soil with high conductivity and centrifuge test scale effect, safety, convenient, fast, accurate, and can be real-time automatic test.
Description
Technical field
The present invention relates to utilize the proving installation of reflection of electromagnetic wave, especially a kind of device of measuring soil body water cut and ionic soil substrate concentration in hydro-extractor.
Background technology
U.S. ASTM standard D-6780 utilizes TDR(electromagnetic wave time domain reflectometry) propose to calculate by test soil body dielectric coefficient the method for soil body water cut; Archie formula proposes soil body conductivity and native pore water conductivity relation, can obtain native pore water conductivity, thereby realize ionic contamination concentration determination by test soil body conductivity.Under hypergravity simulated environment, moulded dimension is little, pollutant gradient is large, and traditional TDR size sensor is larger, in test process, can produce larger disturbance to model in model casing, is not suitable for applying in hydro-extractor.For Polluted Soil, conductivity is generally very high, and frequency electromagnetic waves dissipates fast, causes waveguide end reflection point identification difficulty, and traditional TDR Test method cannot obtain specific inductive capacity.
Summary of the invention
The water cut of the soil body and ionic soil substrate concentration are two very important physical parameters, the object of the present invention is to provide a kind of device of measuring soil body water cut and ionic soil substrate concentration in hydro-extractor, realize soil body water cut and the ionic contamination concentration determination of hypergravity centrifugal model experiment.
The technical solution used in the present invention is as follows:
This device is hexahedral model casing, is furnished with the identical sensor of many rows and multiple row on the two sides of model casing and steel plate below, and the polyoxymethylene section bottom of all the sensors all flushes with steel plate inwall, the tested soil body of landfill in model casing; Each sensor is connected with electromagnetic wave receiving-transmitting device through concentric cable separately by BNC connector separately respectively, and electromagnetic wave receiving-transmitting device is connected with PC, is poly (methyl methacrylate) plate before model casing.
Described identical sensor, includes stainless coaxial gauge head, polyoxymethylene section and three same diameter stainless steel probes; Center, coaxial gauge head lower end has large through-hole, and center, upper end has small through hole, and small through hole is communicated with large through-hole, and BNC connector is equipped with in small through hole inside, and coaxial gauge head lower end has the screw parallel and symmetrical with central axis; The projection of polyoxymethylene section embeds in the large through-hole of coaxial gauge head lower end, polyoxymethylene section is identical with coaxial gauge head external diameter, polyoxymethylene section center has through hole, polyoxymethylene section both sides all have the through hole corresponding with coaxial gauge head screw, first stainless steel probe penetrates polyoxymethylene section central through hole and fixes, with wire, be connected with BNC connector, after second stainless steel probe and the 3rd stainless steel probe penetrate respectively polyoxymethylene section two side through hole, be fixed in the screw of coaxial gauge head lower end, identical length of polyoxymethylene section etc. is exposed in three stainless steel probe lower ends.
The beneficial effect that the present invention has is:
The present invention can realize the joint test of reduced scale soil model water cut and ionic soil substrate concentration in hydro-extractor, not affected by soil body high conductivity and hydro-extractor scale effect, test safety, easily and fast, accurately, and can automatically test in real time.
Accompanying drawing explanation
Fig. 1 is front view of the present invention.
Fig. 2 is the A-A cut-open view of Fig. 1.
Fig. 3 is the right view of Fig. 1.
Fig. 4 is the structural front view of sensor of the present invention.
Fig. 5 is the B-B cut-open view of Fig. 4.
Fig. 6 is specific inductive capacity test waveform figure.
Fig. 7 is conductivity test waveform figure.
In figure: 1, model casing, 2, steel plate, 3, poly (methyl methacrylate) plate, 4, PC, 5, electromagnetic wave receiving-transmitting device, 6, concentric cable, 7, BNC connector, 8, sensor, 9, coaxial gauge head, 10, polyoxymethylene section, 11, stainless steel probe.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in Figure 1, Figure 2, Figure 3 shows, device of the present invention is hexahedral model casing 1, on the two sides of model casing 1 and steel plate below 2, be furnished with the identical sensor 8 of many rows and multiple row, polyoxymethylene section 10 bottoms of all the sensors 8 all flush with steel plate inwall, the tested soil body of the interior landfill of model casing 1; Each sensor 8 is connected with electromagnetic wave receiving-transmitting device 5 through concentric cable 6 separately by BNC connector 7 separately respectively, and electromagnetic wave receiving-transmitting device 5 is connected with PC 4, is poly (methyl methacrylate) plate 3 before model casing 1.
As shown in Figure 4, Figure 5, described identical sensor 8, includes stainless coaxial gauge head 9, polyoxymethylene section 10 and three same diameter stainless steel probes 11, coaxial gauge head 9 centers, lower end have large through-hole, and center, upper end has small through hole, and small through hole is communicated with large through-hole, and BNC connector 7 is equipped with in small through hole inside, and coaxial gauge head 9 lower ends have the screw parallel and symmetrical with central axis, the projection of polyoxymethylene section 10 embeds in coaxial gauge head 9 lower end large through-holes, polyoxymethylene section 10 is identical with coaxial gauge head 9 external diameters, polyoxymethylene Duan10 center has through hole, polyoxymethylene section 10 both sides all have the through hole corresponding with coaxial gauge head 9 screws, first stainless steel probe 11.1 pin penetrates polyoxymethylene section 10 central through hole screw threads and fixes, with wire, be connected with BNC connector 7, after penetrating respectively 10 liang of side through hole of polyoxymethylene section, second stainless steel probe 11.2 and the 3rd stainless steel probe 11.3 be fixed in the screw of coaxial gauge head 9 lower ends, identical length of polyoxymethylene section 10 etc. is exposed in three stainless steel probe 11 lower ends.
Described coaxial gauge head 9 Outside Dimensions are 36mm * 15mm * 25mm, large hole dimension 12mm * 10mm * 20mm, and two ends screw is arranged in apart from central axis 10mm spacing place.
Described polyoxymethylene section 10 is exposed at coaxial gauge head 9 lower ends and is of a size of 36mm * 15mm * 80mm, and middle projection is of a size of 12mm * 10mm * 20mm, mates with coaxial gauge head 9 macropores.
Described stainless steel probe 11 diameter 2mm, first stainless steel probe 11.1 overall length 115mm, second stainless steel probe 11.2 and the 3rd stainless steel probe 11.3 overall length 105mm, three stainless steel probe 11 lower ends are exposed polyoxymethylene section 10 partial-lengths and are 20mm.
Described electromagnetic wave receiving-transmitting device 5 is the product TDR100 of U.S. Campbell Scientific company.
Described concentric cable 6 is the concentric cable of model RG58A/U.
Data acquisition adopts the PCTDR software of Campbell Scientific company.
The course of work of the present invention is as follows:
Installation of sensors, on centrifuge modelling test case, is guaranteed during installation to sensor polyoxymethylene section bottom is mutually concordant with model casing steel plate inwall, connect concentric cable, electromagnetic wave receiving-transmitting device and PC.Pack this device into hydro-extractor, running hydro-extractor, open PC, operation PCTDR software, test starting point and testing length are set, gather waveform, typical test waveform as shown in Figure 6, A point is the initial reflection spot of surface reflection in TDR waveform, and B point is the termination reflection spot of surface reflection in TDR waveform.
Utilize A in oscillogram, B point reflection coefficient ρ
tII, ρ
tIII, can calculate dielectric constant of soil body:
Adjust test starting point and testing length, typical test waveform as shown in Figure 7.Utilize the relative voltage value V at the stable place of test waveform in oscillogram
fwith test waveform section start magnitude of voltage V
s, can try to achieve soil body conductivity
wherein C is the parameter relevant with sensor, by calibration experiment, obtains: utilize the solution of known conductivity, according to methods described herein test TDR waveform, obtain V
f, V
s, utilize function y=kx couple
linear fit, obtains slope k, is calibrating parameters C.Then, can utilize Archie formula to obtain pore water conductivity, determine soil body ionic soil substrate concentration.
Claims (3)
1. a device of measuring soil body water cut and ionic soil substrate concentration in hydro-extractor, it is characterized in that: this device is hexahedral model casing (1), on the two sides of model casing (1) and steel plate below (2), be furnished with the identical sensor (8) of many rows and multiple row, polyoxymethylene section (10) bottom of all the sensors (8) all flushes with steel plate inwall, the tested soil body of the interior landfill of model casing (1); Each sensor (8) is connected with electromagnetic wave receiving-transmitting device (5) through concentric cable (6) separately by BNC connector (7) separately respectively, and electromagnetic wave receiving-transmitting device (5) is connected with PC (4), is poly (methyl methacrylate) plate (3) before model casing (1).
2. a kind of device of measuring soil body water cut and ionic soil substrate concentration in hydro-extractor according to claim 1, it is characterized in that: described identical sensor (8), includes stainless coaxial gauge head (9), polyoxymethylene section (10) and three same diameter stainless steel probes (11), coaxial gauge head (9) center, lower end has large through-hole, and center, upper end has small through hole, and small through hole is communicated with large through-hole, and BNC connector (7) is equipped with in small through hole inside, and coaxial gauge head (9) lower end has the screw parallel and symmetrical with central axis, the projection of polyoxymethylene section (10) embeds in the large through-hole of coaxial gauge head (9) lower end, polyoxymethylene section (10) is identical with coaxial gauge head (9) external diameter, polyoxymethylene section (10) center has through hole, polyoxymethylene section (10) both sides all have the through hole corresponding with coaxial gauge head (9) screw, first stainless steel probe (11.1) penetrates polyoxymethylene section (10) central through hole and fixes, with wire, be connected with BNC connector (7), second draw point (11.2) and the 3rd stainless steel probe (11.3) are fixed in the screw of coaxial gauge head (9) lower end after penetrating respectively polyoxymethylene section (10) two side through hole, the identical length of polyoxymethylene section (10) etc. is exposed in three stainless steel probes (11) lower end.
3. a kind of device of measuring soil body water cut and ionic soil substrate concentration in hydro-extractor according to claim 1, is characterized in that: described electromagnetic wave receiving-transmitting device (5) is the product TDR100 of U.S. Campbell Scientific company.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310497415.XA CN103604840A (en) | 2013-10-21 | 2013-10-21 | Device for measuring water content of soil and concentration of ion pollutants in centrifuge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310497415.XA CN103604840A (en) | 2013-10-21 | 2013-10-21 | Device for measuring water content of soil and concentration of ion pollutants in centrifuge |
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| CN103604840A true CN103604840A (en) | 2014-02-26 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09127032A (en) * | 1995-10-27 | 1997-05-16 | Touyoko Erumesu:Kk | Measuring device for concrete water content |
| EP1775044A1 (en) * | 2004-07-07 | 2007-04-18 | Sintokogio, Ltd. | Electrode mechanism for measuring moisture value of foundry sand, device for measuring moisture value of foundry sand, and method and device for filling water into foundry sand mixer |
| CN201732124U (en) * | 2010-07-20 | 2011-02-02 | 浙江大学 | Test device for testing soil body specific inductive capacity by electromagnetic waves |
| CN103033540A (en) * | 2013-01-15 | 2013-04-10 | 中国海洋大学 | Real-time automatic monitoring method and real-time automatic monitoring system for underground light non-aqueous phase liquid pollutant dispersion |
-
2013
- 2013-10-21 CN CN201310497415.XA patent/CN103604840A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09127032A (en) * | 1995-10-27 | 1997-05-16 | Touyoko Erumesu:Kk | Measuring device for concrete water content |
| EP1775044A1 (en) * | 2004-07-07 | 2007-04-18 | Sintokogio, Ltd. | Electrode mechanism for measuring moisture value of foundry sand, device for measuring moisture value of foundry sand, and method and device for filling water into foundry sand mixer |
| CN201732124U (en) * | 2010-07-20 | 2011-02-02 | 浙江大学 | Test device for testing soil body specific inductive capacity by electromagnetic waves |
| CN103033540A (en) * | 2013-01-15 | 2013-04-10 | 中国海洋大学 | Real-time automatic monitoring method and real-time automatic monitoring system for underground light non-aqueous phase liquid pollutant dispersion |
Non-Patent Citations (1)
| Title |
|---|
| 陈伟: "TDR探头设计及含水量和干密度的联合监测技术", 《中国优秀硕士学文论文全文数据库 工程科技II辑》, no. 7, 15 July 2011 (2011-07-15) * |
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Application publication date: 20140226 |