CN103674978A - Micro time-domain reflecting soil moisture sensor - Google Patents
Micro time-domain reflecting soil moisture sensor Download PDFInfo
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- CN103674978A CN103674978A CN201310665400.XA CN201310665400A CN103674978A CN 103674978 A CN103674978 A CN 103674978A CN 201310665400 A CN201310665400 A CN 201310665400A CN 103674978 A CN103674978 A CN 103674978A
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- soil moisture
- electronic impulse
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
- G01N22/04—Investigating moisture content
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
- G01N33/246—Earth materials for water content
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Abstract
The invention discloses a micro time-domain reflecting soil moisture sensor. The sensor comprises an insulation core column, two electronic pulse protection rods and a fixed bracket, wherein the insulation core column and the two electronic pulse protection rods are uniformly fixed to one end surface of the fixed bracket, and the insulation core column is arranged between the two electronic pulse protection rods; an electronic pulse strip-shaped double-helix transmission wire is wound on the insulation core column; the free end of the electronic pulse strip-shaped double-helix transmission wire extends into the fixed bracket and is connected with one end of an electronic pulse inlet-outlet wire variation indication point arranged in the fixed bracket; the other end of the electronic pulse inlet-outlet wire variation indication point is connected with a sensor connecting wire. The soil moisture sensor disclosed by the invention is not only suitable for homogeneous soil, but also has high adaptability to the soil with high gravel content; compared with the conventional soil moisture sensor based on a time-domain reflecting principle, the measurement precision can be improved, the adaptability can be enhanced, and the research equipment level in the soil moisture migration field in China is improved.
Description
Technical field
The present invention relates to a kind of miniature time domain reflecting soil moisture sensor, belong to soil environment field.
Background technology
Soil moisture content is often used to study soil water movement process, rule and mechanism.At present, the mensuration research of soil moisture content has become basis and the research frontier of the related disciplines such as pedology, ecology, science of water resources and resource and environmental science, is more and more paid attention to.Soil moisture sensor based on time domain principle design, for measuring the data acquisition equipment of soil moisture content, is the widely used sensor type in current soil moisture measurement field.Such soil moisture sensor is owing to being subject to the current restriction that electronic impulse is changed to duration resolving accuracy, propagate the minimum 15cm of the column waveguide post length left and right of electronic impulse, under special soil ambient condition, as the higher soil of mountain area chad content, long soil moisture sensor is difficult to insert completely soil, and the probability that sensor contacts with chad is larger, seriously limited the application of time domain soil moisture sensor in this class soil, completely sensor is being inserted under the condition of soil, measuring accuracy is also difficult to guarantee.Therefore need to design the soil moisture sensor based on time domain principle of length and small volume.
Summary of the invention
The object of this invention is to provide a kind of miniature time domain reflecting soil moisture sensor.
A kind of miniature time domain reflecting soil moisture sensor provided by the present invention, comprises an insulation stem stem, 2 electronic impulses protection rod and a fixed support;
Described insulation stem stem and 2 described electronic impulse protection rods are all fixed on a described support bracket fastened end face, and described insulation stem stem is located between 2 described electronic impulse protection rods;
On described insulation stem stem, be wound with electronic impulse strip double helix and propagate wire; The free-end that described electronic impulse strip double helix is propagated wire extends in described fixed support, and be connected with the one end of electronic impulse turnover wire variation indication point in being located at described fixed support, the other end of described electronic impulse turnover wire variation indication point is connected with sensor connecting line.
Electronic impulse turnover wire variation indication point in soil moisture sensor of the present invention, refer to the resistance of place in circuit or the electric elements of electric capacity, electronic impulse is through out-of-date, and its signal can marked change occur suddenly, is used for entry time point and the return time point of detected electrons pulse.
In above-mentioned soil moisture sensor, described insulation stem stem and 2 described electronic impulse protection rods are located on straight line.
In above-mentioned soil moisture sensor, described insulation stem stem and described electronic impulse protection rod are all in the form of sheets.
In above-mentioned soil moisture sensor, described hold-down support in the form of sheets.
In soil moisture sensor of the present invention, owing to having adopted strip double helix to propagate wire, significantly reduce electronic impulse conductor volume, increased electronic impulse conduction distance, the object that expand sensor usable range to reach, improves measuring accuracy.
Soil moisture sensor of the present invention is not only suitable for homogeneous soil, and higher to the higher soil suitability of chad content, compare with the soil moisture sensor based on Time Domain Reflectometry principle in the past, can improve the precision of measurement and strengthen adaptability, promoting the research equipment in China's Soil Moisture Movement field.The application that the present invention has overcome the soil moisture sensor based on Time Domain Reflectometry principle can not be applied to measure the problem of Heterogeneous soil water cut, and has improved the measuring accuracy under conventional service condition, and the application of this device has very high science using value.
Accompanying drawing explanation
Fig. 1 is the structural representation of the miniature time domain reflecting soil moisture sensor of the present invention.
In figure, each mark is as follows:
1 high-strength insulating stem stem, 2,3 electronic impulse protection rods, 4 electronic impulse strip double helixs are propagated wire, 5 fixed supports, 6 electronic impulse turnover wire variation indication points, 7 sensor connecting lines.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described, but the present invention is not limited to following examples.
As shown in Figure 1, the miniature time domain reflecting soil moisture sensor of the present invention comprises 1,2 electronic impulse protection rod 2 and 3 and one fixed supports 5 of a high-strength insulating stem stem.This high-strength insulating stem stem 1, electronic impulse protection rod 2 and 3 equal slabbings, and be all fixed on an end face of fixed support 5, high-strength insulating stem stem 1 is located between electronic impulse protection rod 2 and 3, and three is a line spread.On high-strength insulating stem stem 1, be wound with electronic impulse strip double helix and propagate wire 4, the free-end that this electronic impulse strip double helix is propagated wire extends in fixed support 5, and pass in and out with the electronic impulse of being located in this fixed support 5 resistance that wire variation indication point 6(is place in circuit, electronic impulse is through out-of-date, can there is suddenly marked change in its signal, be used for the entry time point and return time point of detected electrons pulse) one end be connected, the other end of this electronic impulse turnover wire variation indication point 6 is connected with sensor connecting line 7.Electronic impulse turnover wire variation indication point 6 is metal material, and resistance per unit length value is that electronic impulse strip double helix is propagated the more than 20 times of wire 4 resistance values.
In soil moisture sensor of the present invention, owing to having adopted strip double helix to propagate wire, significantly reduce electronic impulse conductor volume, increased electronic impulse conduction distance, the object that expand sensor usable range to reach, improves measuring accuracy.
While using the miniature time domain reflecting soil moisture sensor of the present invention to measure, by high-strength insulating stem stem 1, electronic impulse protection rod 2 and 3 is inserted in soil, electronic impulse is entered in electronic impulse turnover wire variation indication point 6 by sensor connecting line 7, this time point (is connected with sensor connecting line 7 by supporting electronic pulse signal recognizer, not shown in the figures) be labeled as the moment t1 that electronic impulse enters soil, electronics arteries and veins is propagated wire 4 along electronic impulse strip double helix and is propagated, arriving electronics arteries and veins propagates the end of wire 4 and along electronics arteries and veins along electronic impulse strip double helix, propagates wire 4 and return through electronic impulse turnover wire variation indication point 6 along electronic impulse strip double helix, this time point is labeled as by supporting electronic pulse signal recognizer the moment t2 that electronic impulse spreads out of soil, the transmission duration of electronic impulse in soil is t2-t1, the correlationship of the transmission duration t2-t1 in soil according to soil moisture content and electronic impulse, can judge the size of sensor present position soil moisture content.
Claims (4)
1. a miniature time domain reflecting soil moisture sensor, is characterized in that: described sensor comprises an insulation stem stem, 2 electronic impulses protection rods and a fixed support;
Described insulation stem stem and 2 described electronic impulse protection rods are all fixed on a described support bracket fastened end face, and described insulation stem stem is located between 2 described electronic impulse protection rods;
On described insulation stem stem, be wound with electronic impulse strip double helix and propagate wire; The free-end that described electronic impulse strip double helix is propagated wire extends in described fixed support, and be connected with the one end of electronic impulse turnover wire variation indication point in being located at described fixed support, the other end of described electronic impulse turnover wire variation indication point is connected with sensor connecting line.
2. soil moisture sensor according to claim 1, is characterized in that: described insulation stem stem and 2 described electronic impulse protection rods are located on straight line.
3. soil moisture sensor according to claim 1 and 2, is characterized in that: described insulation stem stem and described electronic impulse protection rod are all in the form of sheets.
4. according to the soil moisture sensor described in any one in claim 1-3, it is characterized in that: described hold-down support in the form of sheets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310665400.XA CN103674978B (en) | 2013-12-10 | 2013-12-10 | A kind of miniature time domain reflecting soil moisture sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310665400.XA CN103674978B (en) | 2013-12-10 | 2013-12-10 | A kind of miniature time domain reflecting soil moisture sensor |
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| CN103674978A true CN103674978A (en) | 2014-03-26 |
| CN103674978B CN103674978B (en) | 2016-01-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104965063A (en) * | 2015-06-05 | 2015-10-07 | 河海大学 | Time domain reflection-based detection method for maintenance quality of early-stage concrete |
| CN111060570A (en) * | 2016-03-30 | 2020-04-24 | 株式会社尼康 | Sensor device and soil environment monitoring method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5136249A (en) * | 1988-06-20 | 1992-08-04 | Commonwealth Scientific & Industrial Research Organization | Probes for measurement of moisture content, solids contents, and electrical conductivity |
| CN1578908A (en) * | 2001-10-29 | 2005-02-09 | 罗斯蒙德公司 | Measurement of concentration of material in a process fluid |
| CN101782535A (en) * | 2010-03-17 | 2010-07-21 | 中国农业大学 | Sensor for TDR soil moisture measuring instrument based on phase detection principle |
-
2013
- 2013-12-10 CN CN201310665400.XA patent/CN103674978B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5136249A (en) * | 1988-06-20 | 1992-08-04 | Commonwealth Scientific & Industrial Research Organization | Probes for measurement of moisture content, solids contents, and electrical conductivity |
| CN1578908A (en) * | 2001-10-29 | 2005-02-09 | 罗斯蒙德公司 | Measurement of concentration of material in a process fluid |
| CN101782535A (en) * | 2010-03-17 | 2010-07-21 | 中国农业大学 | Sensor for TDR soil moisture measuring instrument based on phase detection principle |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104965063A (en) * | 2015-06-05 | 2015-10-07 | 河海大学 | Time domain reflection-based detection method for maintenance quality of early-stage concrete |
| CN111060570A (en) * | 2016-03-30 | 2020-04-24 | 株式会社尼康 | Sensor device and soil environment monitoring method |
| CN111060570B (en) * | 2016-03-30 | 2022-06-07 | 株式会社尼康 | Sensor device and soil environment monitoring method |
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| CN103674978B (en) | 2016-01-20 |
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