CN101216444A - Soil pore water conductivity multi-point automatic monitoring apparatus - Google Patents
Soil pore water conductivity multi-point automatic monitoring apparatus Download PDFInfo
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- CN101216444A CN101216444A CNA2008100591824A CN200810059182A CN101216444A CN 101216444 A CN101216444 A CN 101216444A CN A2008100591824 A CNA2008100591824 A CN A2008100591824A CN 200810059182 A CN200810059182 A CN 200810059182A CN 101216444 A CN101216444 A CN 101216444A
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- test probe
- pore water
- soil
- coaxial
- monitoring apparatus
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- 239000002689 soil Substances 0.000 title claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000012544 monitoring process Methods 0.000 title claims abstract description 20
- 239000011148 porous material Substances 0.000 title claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 72
- 239000000523 sample Substances 0.000 claims abstract description 58
- 239000004020 conductor Substances 0.000 claims abstract description 18
- 239000003822 epoxy resin Substances 0.000 claims abstract description 9
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 abstract 1
- 238000011156 evaluation Methods 0.000 abstract 1
- 238000012806 monitoring device Methods 0.000 abstract 1
- 230000001939 inductive effect Effects 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The invention discloses a multipoint automatic conductivity monitoring device of pore water in soil. N sensors with identical structure are respectively connected with coaxial multiplexers at BNC joints via coaxial cable, the coaxial multiplexers are excited by electromagnetic wave and a receiver is connected with a PC computer. Each sensor includes external conductors of coaxial cables, internal conductors of coaxial cables, an epoxy resin box, a first test probe, a second test probe and a third test probe, wherein the second test probe is connected with the internal conductors of the coaxial cables; the first test probe and the third test probe are distributed on both sides of the second test probe at equal distance and are connected with the external conductors of the coaxial cables; and the connection joints are disposed in the epoxy resin box. The conductivity EC omega of pore water in soil can be monitored by PC software to evaluation the pollution degree of the soil. The method is specifically suitable for long-time remote-control multipoint monitoring in sanitary landfill under high corrosion condition, and has the advantages of rapid monitor, convenient operation and high automation degree.
Description
Technical field
The present invention relates to utilize the pick-up unit of reflection of electromagnetic wave, especially relate to a kind of soil pore water conductivity multi-point automatic monitoring apparatus.
Background technology
At present, aspect the contaminated soil prophylactico-therapeutic measures, people more pay close attention to technical measures such as engineering reparation, biological restoration, physical chemistry reparation, the reparation of moving electricity, monitoring to soil pollution does not attach great importance to, pollution method of testing for soil on the engineering mostly is indoor test, the testing tool (Hewlett-Packard's network analyzer, Hewlett-Packard's electric impedance analyzer) of the complexity that the shop experiment that is confined to the instrument that monitoring is polluted adopts, shortcoming is 1: sample is prepared difficulty, is needed long laboratory experiment, and 2, can't carry out scene and monitor in real time.
In addition, for the soil body pollution tester of present stage, can measure the content of heavy metal ion in the soil body at the scene, but it can't realize the multi-point sampler and long-time monitoring of test site.
Summary of the invention
The object of the present invention is to provide a kind of soil pore water conductivity multi-point automatic monitoring apparatus, by monitoring soil body inner pore water conductivity EC
ωWeigh the pollution level of the soil body.
The technical solution used in the present invention is as follows:
The sensor that a n of the present invention structure is identical is connected with coaxial Port Multiplier by BNC connector through concentric cable respectively, and coaxial Port Multiplier is connected with PC through electromagnetic wave excites, receptacle; Described each sensor comprises coaxial cable outer conductor, inner conductor, epoxy resin box, first test probe, second test probe and the 3rd test probe; Second test probe links to each other with inner conductor; First test probe, the 3rd test probe is equally distributed on the both sides of second test probe, and first test probe, the 3rd test probe all link to each other with coaxial cable outer conductor, and tie point all places the epoxy resin box.
The beneficial effect that the present invention has is:
By monitoring soil body inner pore water conductivity EC
ωWeigh the pollution level of the soil body.Can realize on-the-spot soil body inner pore water conductivity EC
ωQuick test and monitoring of the multi-point remote control of soil body pore water conductivity and long-time monitoring, especially can in sanitary filling field, realize long-time monitoring under the high etching condition.
Description of drawings
Fig. 1 is the on-site testing device schematic diagram.
Fig. 2 is self-control three pin sonde configuration synoptic diagram.
Fig. 3 is TDR method testing conductivity and specific inductive capacity figure.
Fig. 4 is soil body parameter calibration figure.
Among the figure: the 1PC machine, 2, electromagnetic wave excites receptacle, 3, coaxial Port Multiplier, 4, concentric cable, 5, sensor, 5.1, coaxial cable outer conductor, 5.2, inner conductor, 5.3, the epoxy resin box, second reflection spot of sensor in first reflection spot B of sensor, the TDR waveform in 5.4 test probe A, the TDR waveform
Embodiment
As shown in Figure 1 and Figure 2, soil pore water conductivity multi-point automatic monitoring apparatus of the present invention, n the identical sensor 5 of structure is connected with coaxial Port Multiplier 3 by BNC connector through concentric cable 4 respectively, and coaxial Port Multiplier 3 is connected with PC 1 through electromagnetic wave excites, receptacle 2; Described each sensor 5 comprises coaxial cable outer conductor 5.1, inner conductor 5.2, epoxy resin box 5.3, first test probe, 5.4, the second test probes 5.5 and the 3rd test probe 5.6; Second test probe 5.5 links to each other with inner conductor 5.2; First test probe, 5.4, the three test probes 5.6 are equally distributed on the both sides of second test probe 5.5, and first test probe 5.4, the 3rd test probe 5.6 all link to each other with coaxial cable outer conductor 5.2, and tie point all places epoxy resin box 5.3.
Described first test probe 5.4, the 3rd test probe 5.6 and second test probe, 5.5 standoff distances are 25-30mm.
Described first test probe, 5.4, the second test probes 5.5 should be identical with the 3rd test probe 5.6 diameters, is 8-10mm, and test probe lower end 10mm section is coniform.
The sensor 5 that described n structure is identical is n≤512.
Described electromagnetic wave excites, receptacle 2, coaxial Port Multiplier 3 are the product TDR100 of U.S. Campbell Scientific company.
Described concentric cable 3 is the concentric cable of model RG58A/U.
The course of work of the present invention is as follows:
On PC, move the testing software of TDR100 during on-the-spot test, test starting point and frequency acquisition are set, beginning collecting test waveform.Can be for each test waveform in the hope of the apparent conductivity EC of the soil body
a=1/M (2V
s/ V
f-1), V wherein
sBe test waveform section start magnitude of voltage, V
fBe the relative voltage value at the stable place of test waveform, as shown in Figure 3.M is obtained by demarcation by the laboratory for the probe constant.Scaling method is: under 25 degree room temperatures, the TDR waveform with the solution of this probe test known conductivity obtains V
s, V
fValue, then by the following formula inverse constant M value that goes out to pop one's head in.
Simultaneously also can be in the hope of the specific inductive capacity of the soil body between probe: K
a=(v * t/2L
p)
2, wherein t is obtained by test waveform in the travel-time, is the distance (as shown in Figure 3) between first reflection spot of sensor in the TDR waveform and second reflection spot.V is the speed that light is propagated in a vacuum, L
pFor probe test section length, obtain by indoor standardization.Scaling method is: under 25 degree room temperatures, the TDR waveform with the deionized water of this probe test known dielectric constant obtains the t value from test waveform, then by the following formula inverse constant K that goes out to pop one's head in
aValue.
The pore water conductivity EC of the soil body so
ωFor:
In the formula, K
aBe the specific inductive capacity of the soil body, EC
aBe the conductivity of the soil body, have above-mentioned TDR Test waveform to calculate.ω is the water cut of the soil body, ρ
wBe the density of water, ρ
dBe the dry density of the soil body, d
sBe the particle proportion of the soil body, then the character according to on-the-spot soil is obtained by laboratory experiment.
A, b are curve
The slope and the intercept of linear fit, shown in Fig. 4 (a), c, d be curve
The slope and the intercept of linear fit, shown in Fig. 4 (b), f and g are curve
The slope and the intercept of linear fit, shown in Fig. 4 (c).They are relevant with the electrical properties of the on-the-spot soil body, are obtained by indoor standardization, and scaling method is as follows:
It is some to get the undisturbed soil that need will test, get an amount of soil sample and add a certain amount of deionized water, be prepared into the even sample of certain packing, write down the volume and the quality of this sample then, test its specific inductive capacity and conductivity with the TDR Test instrument, test its water cut with oven drying method.Test findings is plotted
,
With
Figure, as shown in Figure 4.Data among the figure are carried out linear fit, and it is soil body parameter a, b, c, d, f, g that the slope of linear fit and intercept distribute.
Claims (6)
1. soil pore water conductivity multi-point automatic monitoring apparatus, it is characterized in that: n the identical sensor (5) of structure is connected with coaxial Port Multiplier (3) by BNC connector through concentric cable (4) respectively, and coaxial Port Multiplier (3) is connected with PC (1) through electromagnetic wave excites, receptacle (2); Described each sensor (5) comprises coaxial cable outer conductor (5.1), inner conductor (5.2), epoxy resin box (5.3), first test probe (5.4), second test probe (5.5) and the 3rd test probe (5.6); Second test probe (5.5) links to each other with inner conductor (5.2); First test probe (5.4), the 3rd test probe (5.6) is equally distributed on the both sides of second test probe (5.5), first test probe (5.4), the 3rd test probe (5.6) all link to each other with coaxial cable outer conductor (5.2), and tie point all places epoxy resin box (5.3).
2. a kind of soil pore water conductivity multi-point automatic monitoring apparatus according to claim 1 is characterized in that: described first test probe (5.4), the 3rd test probe (5.6) are 25～30mm with second test probe (5.5) standoff distance.
3. a kind of soil pore water conductivity multi-point automatic monitoring apparatus according to claim 1, it is characterized in that: described first test probe (5.4), second test probe (5.5) should be identical with the 3rd test probe (5.6) diameter, be 8-10mm, test probe lower end 10mm section is coniform.
4. a kind of soil pore water conductivity multi-point automatic monitoring apparatus according to claim 1 is characterized in that: the identical sensor (5) of described n structure is n≤512.
5. a kind of soil pore water conductivity multi-point automatic monitoring apparatus according to claim 1 is characterized in that: described electromagnetic wave excites, receptacle (2), coaxial Port Multiplier (3) are the product TDR100 of U.S. CampbellScientific company.
6. a kind of soil pore water conductivity multi-point automatic monitoring apparatus according to claim 1 is characterized in that: described concentric cable (3) is the concentric cable of model RG58A/U.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100591824A CN101216444A (en) | 2008-01-16 | 2008-01-16 | Soil pore water conductivity multi-point automatic monitoring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100591824A CN101216444A (en) | 2008-01-16 | 2008-01-16 | Soil pore water conductivity multi-point automatic monitoring apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN101216444A true CN101216444A (en) | 2008-07-09 |
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| CNA2008100591824A Pending CN101216444A (en) | 2008-01-16 | 2008-01-16 | Soil pore water conductivity multi-point automatic monitoring apparatus |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278437A (en) * | 2013-05-29 | 2013-09-04 | 浙江大学 | Simulation test device for muddy water shield mud membrane formation process |
| CN106841317A (en) * | 2017-01-25 | 2017-06-13 | 浙江大学 | Polluted Soil conductivity measurement and electric osmose process electrical parameter change real-time monitoring device |
| CN112729992A (en) * | 2021-01-19 | 2021-04-30 | 浙江大学 | Thermophysical property testing device for organic contaminated soil |
| CN117420177A (en) * | 2023-12-14 | 2024-01-19 | 山东黄河顺成水利水电工程有限公司 | Method, equipment and medium for monitoring water erosion state of earth and rockfill embankment structure |
| CN117890394A (en) * | 2024-03-14 | 2024-04-16 | 中铁七局集团第三工程有限公司 | Device and method for detecting mud cake of shield cutter head |
-
2008
- 2008-01-16 CN CNA2008100591824A patent/CN101216444A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278437A (en) * | 2013-05-29 | 2013-09-04 | 浙江大学 | Simulation test device for muddy water shield mud membrane formation process |
| CN103278437B (en) * | 2013-05-29 | 2015-09-30 | 浙江大学 | The simulation test device of slurry shield mud film forming process |
| CN106841317A (en) * | 2017-01-25 | 2017-06-13 | 浙江大学 | Polluted Soil conductivity measurement and electric osmose process electrical parameter change real-time monitoring device |
| CN106841317B (en) * | 2017-01-25 | 2023-03-17 | 浙江大学 | Device for measuring conductivity of polluted soil and monitoring change of electrical parameters in electroosmosis process in real time |
| CN112729992A (en) * | 2021-01-19 | 2021-04-30 | 浙江大学 | Thermophysical property testing device for organic contaminated soil |
| CN117420177A (en) * | 2023-12-14 | 2024-01-19 | 山东黄河顺成水利水电工程有限公司 | Method, equipment and medium for monitoring water erosion state of earth and rockfill embankment structure |
| CN117420177B (en) * | 2023-12-14 | 2024-03-05 | 山东黄河顺成水利水电工程有限公司 | Method, equipment and medium for monitoring water erosion state of earth and rockfill embankment structure |
| CN117890394A (en) * | 2024-03-14 | 2024-04-16 | 中铁七局集团第三工程有限公司 | Device and method for detecting mud cake of shield cutter head |
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Open date: 20080709 |