CN103885078A - Method and device for obtaining soil potentiality radon concentration by measuring surface soil radon precipitation rate in sampling mode - Google Patents
Method and device for obtaining soil potentiality radon concentration by measuring surface soil radon precipitation rate in sampling mode Download PDFInfo
- Publication number
- CN103885078A CN103885078A CN201410129592.7A CN201410129592A CN103885078A CN 103885078 A CN103885078 A CN 103885078A CN 201410129592 A CN201410129592 A CN 201410129592A CN 103885078 A CN103885078 A CN 103885078A
- Authority
- CN
- China
- Prior art keywords
- soil
- radon
- cutting ring
- cutting
- concentration
- 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.)
- Granted
Links
Images
Landscapes
- Measurement Of Radiation (AREA)
Abstract
Provided are a method and device for obtaining soil potentiality radon concentration by measuring surface soil radon precipitation rate in a sampling mode. First, soil in a natural state is cut with a soil cutting device, then the soil cutting device is taken out from the soil in the natural state, a ring knife connector on the soil cutting device is detached, surplus soil is removed by cutting, and soil at the two ends of an inner ring of a ring knife are trimmed and flattening by cutting. After trimming, a filtering film covers one end, connected with the ring knife connector, of the sampled ring knife, the ring knife and the ring knife connector are connected together through threads, then the soil cutting device, an air pump and an emanometer are connected through pipelines to form a measuring device, the measuring device is used for measuring the production rate of radon in the soil, and then soil potentiality radon concentration is obtained by computing.
Description
Technical field
The present invention relates to a kind of nuclear radiation detection technology, particularly a kind of sampled measurements topsoil precipitation rate of radon obtains method and the device of soil potentiality radon concentration.
Background technology
In soil, potential maximum radon concentration is exactly soil potentiality radon concentration, Soil Radon concentration and low-rise building Indoor Niton level and hypogee radon level are closely bound up, in the addressing of construction work and the anti-radon design process of building, all need Soil Radon concentration to measure, the soil of matter type substantially all will even more just can reach potentiality radon concentration level in depths at 2m variously.But, at present fathoming generally between 0.5-0.8m of Soil Radon concentration, the Soil Radon concentration of this degree of depth is far below soil potentiality radon concentration, and directly soil potentiality radon concentration measured, and the 2-3m that need to burrow could directly measure, and difficulty is larger.Therefore, need a kind of method that obtains soil potentiality radon concentration that top layer soil sampling is measured.
Summary of the invention
The object of the invention is to overcome the above-mentioned deficiency of prior art and provide a kind of sampled measurements topsoil precipitation rate of radon to obtain method and the device of soil potentiality radon concentration, the potentiality of the soil more accurately radon concentration that adopts the method to obtain by simple computing method fast.
Technical scheme of the present invention is: a kind of sampled measurements topsoil precipitation rate of radon obtains the method for soil potentiality radon concentration, and it comprises sampled measurements process and computation process;
One, sampled measurements process:
Cutting ring on soil cutting device and cutting ring connector are together by a threaded connection, then cutting ring is all pressed into the soil that cuts state of nature in soil, make the interior ring of cutting ring be full of soil, and keep soil natural structure not to be destroyed, again cutting ring is taken out from the soil of state of nature, unload cutting ring connector, unnecessary soil on excision cutting ring, scabbles the soil finishing that encircles two ends in cutting ring.
After having repaired, the one end being connected with cutting ring connector of getting excellent cutting ring is covered to filter membrane, cutting ring and cutting ring connector are together by a threaded connection, and then cutting ring connector is connected and is combined into measurement mechanism with air pump and emanometer by pipeline.
When measurement, open air pump, air enters from the soil encircling in cutting ring, enters emanometer discharge by pipeline, by emanometer, the generation rate of encircling radon in soil in cutting ring is measured.
Two, measure computation process:
Under one dimension steady state (SS), only consider the diffusion of radon in uniform soil medium, and set up radon and in soil, migrate and the differential equation distributing:
In formula, the effective diffusion cofficient that De is radon, unit is m
2s
-1; C (x) is that in soil, the degree of depth is the radon concentration at x place, and unit is Bqm
-3; X is depth of soil, and unit is m; λ is the disintegration constant of radon, and its value is 2.1 × 10
-6s
-1; η is soil porosity, dimensionless, and the factor of porosity η that different soil types is corresponding different, according to the type of soil approximate the obtaining of tabling look-up, or takes back laboratory Measurement accuracy by the soil in cutting ring and obtains; A is the generation rate of radon in soil, and unit is Bqm
-3s
-1.
Because soil surface radon in air concentration is very low, can be similar to and think to be 0, boundary condition:
; The infinite depths of soil, Soil Radon concentration can not be still infinitely great, boundary condition:
bounded.
Formula (1) is solved and bring into boundary condition to be obtained:
（2）
Soil Radon potentiality can be thought the radon concentration in the infinite depths of soil, that is:
Utilize measurement mechanism to measure the generation rate of radon in soil, the reading C of stable rear emanometer is:
F is the flow rate of pump; V is the volume of sampling soil, and unit is m
3;
Correlation parameter substitution formula (4) just can be obtained to the value of A.
Again the value substitution formula (3) of A, η just can be obtained to the potentiality radon concentration of soil.
After being connected by pipeline by soil cutting device, air pump and emanometer, the measurement mechanism that above-mentioned measuring method adopts forms, straight tube handle vent port on soil cutting device is connected with one end of air pump by pipeline, and the other end of air pump is connected with emanometer by pipeline.
Described soil cutting device is made up of cutting ring connector and cutting ring.One end of described cutting ring connector is provided with annular opening chamber, the port in annular opening chamber is provided with stepped hole, the port of stepped hole is provided with the internal thread being connected with cutting ring, the bottom centre in annular opening chamber is provided with center pit, the other end of cutting ring connector is welded with a straight pipe communicating with center pit, the other end of straight pipe is welded with an one end and seals the straight tube handle of an end opening, and the vent port on straight tube handle communicates with the endoporus of straight pipe.One end of described cutting ring is provided with the edge of a knife, and the other end of cutting ring is provided with the external thread being connected with cutting ring handle.
The effect that annular opening chamber is set on cutting ring connector is to make air flow energy evenly by soil, by the radon in soil by air-flow homogeneous band out, improves the accuracy of measuring.
The present invention compared with prior art has following features:
Adopt method provided by the invention can utilize topsoil precipitation rate of radon to obtain soil potentiality radon concentration, its sampled measurements process and computing method are simple, and can obtain soil potentiality radon concentration more accurately.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Brief description of the drawings
Accompanying drawing 1 is measuring system schematic diagram provided by the invention, and in figure, P1 is airintake direction, and P2 is outgassing direction;
The structural representation that accompanying drawing 2 is measurement mechanism;
Accompanying drawing 3 is the A-A cut-open view in accompanying drawing 2;
Accompanying drawing 4 is the structural representation of cutting ring connector;
Accompanying drawing 5 is the B-B cut-open view in accompanying drawing 4;
The structural representation that accompanying drawing 6 is cutting ring;
Accompanying drawing 7 is the C-C cut-open view in accompanying drawing 6.
Embodiment
Sampled measurements topsoil precipitation rate of radon obtains a method for soil potentiality radon concentration, and it comprises sampled measurements process and computation process;
One, sampled measurements process:
Cutting ring 1-2 on soil cutting device 1 and cutting ring connector 1-1 are together by a threaded connection, then cutting ring 1-2 is all pressed into the soil that cuts state of nature in soil, make the interior ring of cutting ring 1-2 be full of soil 4, and keep soil 4 natural structures not to be destroyed, again cutting ring 1-2 is taken out from the soil of state of nature, unload cutting ring connector, the upper unnecessary soil of excision cutting ring 1-2, scabbles soil 4 finishings that encircle two ends in cutting ring 1-2.
After having repaired, the one end being connected with cutting ring connector of getting excellent cutting ring 1-2 is covered to filter membrane 5, cutting ring 1-2 and cutting ring connector 1-1 are together by a threaded connection, and then soil cutting device 1 is connected and is combined into measurement mechanism with air pump 2 and emanometer 3 by pipeline.
When measurement, open air pump 2, air enters from the soil 4 encircling in cutting ring 1-2, enters emanometer 3 discharge by pipeline, by emanometer 3, the generation rate of encircling radon in soil 4 in cutting ring 1-2 is measured
Two, measure computation process:
Under one dimension steady state (SS), only consider the diffusion of radon in uniform soil medium, and set up radon and in soil, migrate and the differential equation distributing:
In formula, the effective diffusion cofficient that De is radon, unit is m
2s
-1; C (x) is that in soil, the degree of depth is the radon concentration at x place, and unit is Bqm
-3; X is depth of soil, and unit is m; λ is the disintegration constant of radon, and its value is 2.1 × 10
-6s
-1; η is soil porosity, dimensionless, and the factor of porosity η that different soil types is corresponding different, according to the type of soil approximate the obtaining of tabling look-up, or takes back laboratory Measurement accuracy by the soil in cutting ring 1-2 4 and obtains; A is the generation rate of radon in soil, and unit is Bqm
-3s
-1.
Because soil surface radon in air concentration is very low, can be similar to and think to be 0, boundary condition:
; The infinite depths of soil, Soil Radon concentration can not be still infinitely great, boundary condition:
bounded.
Formula (1) is solved and bring into boundary condition to be obtained:
Soil Radon potentiality can be thought the radon concentration in the infinite depths of soil, that is:
（3）
Utilize measurement mechanism to measure the generation rate of radon in soil 4, the reading C of stable rear emanometer 3 is:
(4)
F is the flow rate of pump; V is the volume of sampling soil, and unit is m
3;
Correlation parameter substitution formula (4) just can be obtained to the value of A.
Again the value substitution formula (3) of A, η just can be obtained to the potentiality radon concentration of soil.
After being connected by pipeline by soil cutting device 1, air pump 2 and emanometer 3, the measurement mechanism that above-mentioned measuring method adopts forms, straight tube handle 1-1-6 vent port on soil cutting device 1 is connected with one end of air pump 2 by pipeline, and the other end of air pump 2 is connected with emanometer 3 by pipeline.
Described soil cutting device 1 is made up of cutting ring connector 1-1 and cutting ring 1-2.One end of described cutting ring connector 1-1 is provided with annular opening chamber 1-1-1, the port of annular opening chamber 1-1-1 is provided with stepped hole 1-1-2, the port of stepped hole 1-1-2 is provided with the internal thread 1-1-3 being connected with cutting ring 1-2, the bottom centre of annular opening chamber 1-1-1 is provided with center pit 1-1-4, the other end of cutting ring connector 1-1 is welded with a straight pipe 1-1-5 who communicates with center pit 1-1-4, the other end of straight pipe 1-1-5 is welded with an one end and seals the straight tube handle 1-1-6 of an end opening, and the vent port on straight tube handle 1-1-6 communicates with the endoporus of straight pipe 1-1-5.One end of described cutting ring 1-2 is provided with edge of a knife 1-2-1, and the other end of cutting ring 1-2 is provided with the external thread 1-2-2 being connected with cutting ring handle 1-1.
The effect that annular opening chamber 1-1-1 is set on cutting ring connector 1-1 is to make air flow energy evenly by soil 4, by the radon in soil 4 by air-flow homogeneous band out, improves the accuracy of measuring.
Claims (2)
1. sampled measurements topsoil precipitation rate of radon obtains a method for soil potentiality radon concentration, it is characterized in that: it comprises sampled measurements process and computation process;
One, sampled measurements process:
Cutting ring on soil cutting device and cutting ring connector are together by a threaded connection, then cutting ring is all pressed into the soil that cuts state of nature in soil, make the interior ring of cutting ring be full of soil, and keep soil natural structure not to be destroyed, again cutting ring is taken out from the soil of state of nature, unload cutting ring connector, unnecessary soil on excision cutting ring, scabbles the soil finishing that encircles two ends in cutting ring;
After having repaired, the one end being connected with cutting ring connector of getting excellent cutting ring is covered to filter membrane, cutting ring and cutting ring connector are together by a threaded connection, and then soil cutting device is connected and is combined into measurement mechanism with air pump and emanometer by pipeline;
When measurement, open air pump, air enters from the soil encircling in cutting ring, enters emanometer discharge by pipeline, by emanometer, the generation rate of encircling radon in soil in cutting ring is measured;
Two, measure computation process:
Under one dimension steady state (SS), only consider the diffusion of radon in uniform soil medium, and set up radon and in soil, migrate and the differential equation distributing:
In formula, the effective diffusion cofficient that De is radon, unit is m
2s
-1; C (x) is that in soil, the degree of depth is the radon concentration at x place, and unit is Bqm
-3; X is depth of soil, and unit is m; λ is the disintegration constant of radon, and its value is 2.1 × 10
-6s
-1; η is soil porosity, dimensionless, and the factor of porosity η that different soil types is corresponding different, according to the type of soil approximate the obtaining of tabling look-up, or takes back laboratory Measurement accuracy by the soil in cutting ring 1-3 and obtains; A is the generation rate of radon in soil, and unit is Bqm
-3s
-1;
Because soil surface radon in air concentration is very low, can be similar to and think to be 0, boundary condition:
; The infinite depths of soil, Soil Radon concentration can not be still infinitely great, boundary condition:
bounded;
Formula (1) is solved and bring into boundary condition to be obtained:
（2）
Soil Radon potentiality can be thought the radon concentration in the infinite depths of soil, that is:
Utilize measurement mechanism to measure the generation rate of radon in soil, the reading C of stable rear emanometer is:
F is the flow rate of pump; V is the volume of sampling soil, and unit is m
3;
Correlation parameter substitution formula (4) just can be obtained to the value of A;
Again the value substitution formula (3) of A, η just can be obtained to the potentiality radon concentration of soil.
2. a kind of sampled measurements topsoil precipitation rate of radon according to claim 1 obtains the method for soil potentiality radon concentration, it is characterized in that: described measurement mechanism forms after being connected by pipeline by soil cutting device, air pump and emanometer, straight tube handle vent port on soil cutting device is connected with one end of air pump by pipeline, and the other end of air pump is connected with emanometer by pipeline;
Described soil cutting device is made up of cutting ring connector and cutting ring; One end of described cutting ring connector is provided with annular opening chamber, the port in annular opening chamber is provided with stepped hole, the port of stepped hole is provided with the internal thread being connected with cutting ring, the bottom centre in annular opening chamber is provided with center pit, the other end of cutting ring connector is welded with a straight pipe communicating with center pit, the other end of straight pipe is welded with an one end and seals the straight tube handle of an end opening, and the vent port on straight tube handle communicates with the endoporus of straight pipe; One end of described cutting ring is provided with the edge of a knife, and the other end of cutting ring is provided with the external thread being connected with cutting ring handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410129592.7A CN103885078B (en) | 2014-04-02 | 2014-04-02 | Sampled measurements topsoil precipitation rate of radon obtains the method and device of soil potentiality radon consistence |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410129592.7A CN103885078B (en) | 2014-04-02 | 2014-04-02 | Sampled measurements topsoil precipitation rate of radon obtains the method and device of soil potentiality radon consistence |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103885078A true CN103885078A (en) | 2014-06-25 |
| CN103885078B CN103885078B (en) | 2016-09-14 |
Family
ID=50954072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410129592.7A Expired - Fee Related CN103885078B (en) | 2014-04-02 | 2014-04-02 | Sampled measurements topsoil precipitation rate of radon obtains the method and device of soil potentiality radon consistence |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103885078B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678767A (en) * | 2015-02-02 | 2015-06-03 | 衡阳师范学院 | Method for randomly adjusting carbon dioxide flux and leakage and back-diffusion coefficients and standard device |
| CN108680467A (en) * | 2018-05-21 | 2018-10-19 | 南华大学 | The method of underground engineering in-site detecting radon diffusion coefficient and the radon production rate that can migrate |
| CN108872544A (en) * | 2018-09-14 | 2018-11-23 | 衡阳师范学院 | A kind of method and device using topsoil static measurement soil potentiality radon consistence |
| CN108896467A (en) * | 2018-08-28 | 2018-11-27 | 衡阳师范学院 | A kind of method and device of dynamic measurement porosity of soil |
| CN108918395A (en) * | 2018-09-07 | 2018-11-30 | 衡阳师范学院 | A kind of method and device using electrostatic collection emanometer measurement porosity of soil |
| CN109030785A (en) * | 2018-08-28 | 2018-12-18 | 衡阳师范学院 | A kind of method and device measuring soil potentiality radon consistence using topsoil dynamic |
| CN109060633A (en) * | 2018-09-14 | 2018-12-21 | 衡阳师范学院 | A kind of method and device of static measurement porosity of soil |
| CN109085632A (en) * | 2018-09-07 | 2018-12-25 | 衡阳师范学院 | A kind of method and device of static collection measurement soil potentiality radon consistence |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101644700A (en) * | 2008-12-10 | 2010-02-10 | 南华大学 | Method and device for measuring radon exhalation rate on medium surface |
| CN102091472A (en) * | 2009-12-10 | 2011-06-15 | 冉伊虹 | Method for controlling double-control tap of water purifier |
| CN102520434A (en) * | 2011-12-19 | 2012-06-27 | 衡阳师范学院 | Open-loop type quick measurement method of radon exhalation rate |
| CN203383816U (en) * | 2013-08-09 | 2014-01-08 | 新疆农业科学院园艺作物研究所 | Buckle type cutting ring soil sampler |
-
2014
- 2014-04-02 CN CN201410129592.7A patent/CN103885078B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101644700A (en) * | 2008-12-10 | 2010-02-10 | 南华大学 | Method and device for measuring radon exhalation rate on medium surface |
| CN102091472A (en) * | 2009-12-10 | 2011-06-15 | 冉伊虹 | Method for controlling double-control tap of water purifier |
| CN102520434A (en) * | 2011-12-19 | 2012-06-27 | 衡阳师范学院 | Open-loop type quick measurement method of radon exhalation rate |
| CN203383816U (en) * | 2013-08-09 | 2014-01-08 | 新疆农业科学院园艺作物研究所 | Buckle type cutting ring soil sampler |
Non-Patent Citations (8)
| Title |
|---|
| YANLIANG TAN ET AL: "Measuring radon exhalation rate by tracing the radon concentration of ventilation-type accumulation chamber", 《RADIATION MEASUREMENTS》, vol. 58, 30 November 2013 (2013-11-30) * |
| YANLIANG TAN ET AL: "Revision for Measuring the Radon Exhalation Rate From the Medium Surface", 《IEEE TRANSACTIONS ON NUCLEAR SCIENCE》, vol. 58, no. 1, 28 February 2011 (2011-02-28), XP011334589, DOI: doi:10.1109/TNS.2010.2090897 * |
| 中国人民共和国农业部: "《中华人民共和国农业行业标准NY/T1121.4-2006》", 30 October 2006, article "土壤检测 第4部分：土壤容重的测定", pages: 4 * |
| 彭俊哲: "土壤潜势氡浓度快速测量方法的研究", 《中国优秀硕士学位论文全文数据库•农业科技辑》 * |
| 彭俊哲: "土壤潜势氡浓度快速测量方法的研究", 《中国优秀硕士学位论文全文数据库•农业科技辑》, no. 1, 15 January 2014 (2014-01-15), pages 13 - 17 * |
| 彭俊哲等: "土壤潜势氡浓度快速测量方法理论模型的建立与验证", 《原子能科学技术》, vol. 47, no. 5, 30 May 2013 (2013-05-30) * |
| 欧阳琦等: "双源法测量土壤潜势氡浓度的计算方法", 《核电子学与探测技术》, vol. 34, no. 1, 1 January 2014 (2014-01-01) * |
| 谭延亮等: "累积法测量氡析出率数据拟合方法探讨", 《核电子学与探测技术》, vol. 29, no. 5, 30 September 2009 (2009-09-30) * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678767A (en) * | 2015-02-02 | 2015-06-03 | 衡阳师范学院 | Method for randomly adjusting carbon dioxide flux and leakage and back-diffusion coefficients and standard device |
| CN108680467A (en) * | 2018-05-21 | 2018-10-19 | 南华大学 | The method of underground engineering in-site detecting radon diffusion coefficient and the radon production rate that can migrate |
| CN108680467B (en) * | 2018-05-21 | 2020-07-10 | 南华大学 | Method for in-situ determination of radon diffusion coefficient and transportable radon generation rate in underground engineering |
| CN108896467A (en) * | 2018-08-28 | 2018-11-27 | 衡阳师范学院 | A kind of method and device of dynamic measurement porosity of soil |
| CN109030785A (en) * | 2018-08-28 | 2018-12-18 | 衡阳师范学院 | A kind of method and device measuring soil potentiality radon consistence using topsoil dynamic |
| CN108918395A (en) * | 2018-09-07 | 2018-11-30 | 衡阳师范学院 | A kind of method and device using electrostatic collection emanometer measurement porosity of soil |
| CN109085632A (en) * | 2018-09-07 | 2018-12-25 | 衡阳师范学院 | A kind of method and device of static collection measurement soil potentiality radon consistence |
| CN109085632B (en) * | 2018-09-07 | 2019-10-08 | 衡阳师范学院 | A kind of method and device of static collection measurement soil potentiality radon consistence |
| CN108872544A (en) * | 2018-09-14 | 2018-11-23 | 衡阳师范学院 | A kind of method and device using topsoil static measurement soil potentiality radon consistence |
| CN109060633A (en) * | 2018-09-14 | 2018-12-21 | 衡阳师范学院 | A kind of method and device of static measurement porosity of soil |
| CN109060633B (en) * | 2018-09-14 | 2019-06-28 | 衡阳师范学院 | A kind of method and device of static measurement porosity of soil |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103885078B (en) | 2016-09-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103885078A (en) | Method and device for obtaining soil potentiality radon concentration by measuring surface soil radon precipitation rate in sampling mode | |
| CN103777222B (en) | Utilize the method for Effective Decay Constant open loop type continuous coverage precipitation rate of radon | |
| CN103293094B (en) | A kind of electro-chemical measuring apparatus and using method thereof that quantitatively can change thickness of liquid film | |
| LU101541B1 (en) | Gas-liquid two-phase saturated coal rock sample experimental device and saturation test method | |
| RU2012136121A (en) | MEASUREMENT OF PARAMETERS RELATED TO THE PASSAGE OF FLUIDS IN A POROUS MATERIAL | |
| EP3088862A3 (en) | Apparatus and method for determining an amount of non-condensable gas | |
| CN203310734U (en) | Electrochemical measurement device capable of quantitatively changing thickness of liquid membrane | |
| NO321567B1 (en) | Method and apparatus for fast grinding of the resistivity index of solid samples, such as stone | |
| CN103869055A (en) | Method for measuring concentration of radon of shallow soil layer to obtain soil potentiality radon concentration | |
| CN108896467B (en) | Method and device for dynamically measuring soil porosity | |
| CN204027889U (en) | On-line gas analysis sample gas pre-service integrating device | |
| CN203965111U (en) | A kind of water inspection machine | |
| CN204112301U (en) | A kind of hole pressure touching methods probe vacuum degassing device | |
| CN207600824U (en) | A kind of soil sample humidifying device for surveying body change | |
| CN108918395B (en) | Method and device for measuring soil porosity by using electrostatic collection emanometer | |
| CN105115928A (en) | Composite sensor | |
| CN203688416U (en) | Double-ring soil infiltration runoff measuring instrument | |
| CN201748941U (en) | Venturi automation water measuring device | |
| CN107179393B (en) | A kind of pore water pressure force test method of low water content densification rock soil medium | |
| CN105300846B (en) | A kind of monitoring method for meter level dimensional area liquid medium measuring surface pressure | |
| CN109060633B (en) | A kind of method and device of static measurement porosity of soil | |
| CN205091261U (en) | Composite sensor | |
| CN109030785B (en) | Method and device for dynamically measuring soil potential radon concentration by utilizing surface soil | |
| CN103335919B (en) | Detector of channel water infiltration coefficient | |
| CN207882162U (en) | A kind of laser dijection sensor for evaluating hollow-fibre membrane backwash effect |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20160914 Termination date: 20200402 |