CN208188025U - A kind of device using infrared thermal imaging method measurement unsaturated soil thermal coefficient - Google Patents
A kind of device using infrared thermal imaging method measurement unsaturated soil thermal coefficient Download PDFInfo
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- CN208188025U CN208188025U CN201820745616.5U CN201820745616U CN208188025U CN 208188025 U CN208188025 U CN 208188025U CN 201820745616 U CN201820745616 U CN 201820745616U CN 208188025 U CN208188025 U CN 208188025U
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- drying box
- soil body
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Abstract
The utility model relates to a kind of devices using infrared thermal imaging method measurement unsaturated soil thermal coefficient, including infrared thermal imager, drying box, constant temperature heating plate, electronic scale, porous ceramic plate, hygrometer and vacuum pump；The drying box is divided into upper and lower two layers by porous ceramic plate, and saturated salt solution is placed in the lower layer of drying box, window is offered on the one side on the upper layer of drying box, and closed set has glass for infrared rays in window；It is placed with electronic scale in the upper layer of drying box, is placed with constant temperature heating plate on electronic scale；Hygrometer is arranged in drying box；Infrared thermal imager is arranged outside drying box, and opposite with the unsaturation soil body sample being placed on constant temperature heating plate through glass for infrared rays.The utility model can both guarantee not contacting unsaturation soil body sample, avoid generating interference, and the whole audience temperature of available unsaturation soil body specimen surface to the heat transmitting of unsaturation soil body sample.
Description
Technical field
The utility model relates to be related to the measuring device of unsaturated soil thermal coefficient, and in particular to it is a kind of using it is infrared heat at
The device of image space method measurement unsaturated soil thermal coefficient.
Background technique
Soil body thermal coefficient be research refuse landfill soil barrier, earth source heat pump, height put Surrounding Nuclear Waste Repositories seal up for safekeeping, direct-buried cable
Important thermal physical property parameter in the geotechnical engineerings multi- scenarios method problems such as heat dissipation.The soil body in above-mentioned engineering is usually unsaturation shape
State, and moisture content is generally in during constantly developing, the thermal coefficient for measuring the soil body under different saturation is one ten
Divide important project.
The thermal conductivity measurement of the soil body can use two methods of Transient Method and steady state method, and the key problem of test is temperature
Measurement, conventional method is measured using thermoprobe method, such as common crosspointer thermal pulse method (DPHP).The hot arteries and veins of crosspointer
Punching method is that temperature is measured under contact condition, and the Temperature Distribution of the soil body can be influenced because of thermal probe contact measured target, and
And thermoprobe method can only measure the temperature of several measuring points, influence measurement accuracy.
Utility model content
Unsaturated soil is measured using infrared thermal imaging method the technical problem to be solved by the utility model is to provide a kind of
The device of thermal coefficient may be implemented the whole audience Temperature Distribution for measuring the soil body under contactless state, improve measurement accuracy.
The technical solution that the utility model solves above-mentioned technical problem is as follows: a kind of non-using the measurement of infrared thermal imaging method
The device of saturated soil thermal coefficient, including it is infrared thermal imager, drying box, constant temperature heating plate, electronic scale, porous ceramic plate, wet
Degree meter and vacuum pump；The drying box is divided into upper and lower two layers by the porous ceramic plate, is placed in the lower layer of the drying box
Saturated salt solution offers window on the one side on the upper layer of the drying box, and in the window closed set have it is infrared
Glass；It is placed with the electronic scale in the upper layer of the drying box, the constant temperature heating plate is placed on the electronic scale；It is described
Hygrometer is arranged in the drying box；The vacuum pump is arranged outside the drying box, and passes through pipeline and the drying box
Connection；The infrared thermal imager is arranged outside the drying box, and through the glass for infrared rays and is placed on the constant temperature
Unsaturation soil body sample in heating plate is opposite.
It is led the beneficial effects of the utility model are: the utility model is a kind of using infrared thermal imaging method measurement unsaturated soil
While the device of hot coefficient controls the saturation degree of unsaturation soil body sample using the saturated salt solution in drying box, satisfied using non-
It is heated with the constant temperature heating plate of soil body sample bottom, it is thermally conductive under different saturation that unsaturation soil body sample is measured with Transient Method
Coefficient；Meanwhile infrared thermal imager measures unsaturation soil body specimen temperature, can both guarantee not contacting unsaturation soil body sample,
It avoids generating interference, and the whole audience temperature of available unsaturation soil body specimen surface to the heat transmitting of unsaturation soil body sample；
In addition, the air in drying box is extracted out by vacuum pump mostly, unsaturation soil body sample in temperature taking process is considerably reduced
The convective heat transfer on surface and air ensure that the precision of thermal conductivity measurement.
Based on the above technical solution, the utility model can also do following improvement.
Further, the insulation box of one side opening, and the one side face of the insulation box opening are additionally provided on the electronic scale
The glass for infrared rays, the constant temperature heating plate and the unsaturation soil body sample on the constant temperature heating plate are put
It sets in the insulation box, and is wrapped up by the insulation box.
Beneficial effect using above-mentioned further scheme is: being insulated the setting of box, can avoid unsaturation to the greatest extent
Soil body sample temperature is influenced by other external conditions other than constant temperature heating plate, improves measurement accuracy.
Further, the unsaturation soil body sample is cuboid-type structure.
Further, the solute of the saturated salt solution is lithium chloride, potassium acetate, sodium bromide, copper chloride, sodium chloride, sulfuric acid
Any one of ammonium and potassium sulfate.
Beneficial effect using above-mentioned further scheme is: solute selective chlorination lithium, the potassium acetate, bromination of saturated salt solution
The relative humidity of the controls such as sodium, copper chloride, sodium chloride, ammonium sulfate, potassium sulfate varies with temperature little salting liquid.
Further, valve is additionally provided on the pipeline.
Detailed description of the invention
Fig. 1 is a kind of entirety for the device that unsaturated soil thermal coefficient is measured using infrared thermal imaging method of the utility model
Structural schematic diagram.
In attached drawing, parts list represented by the reference numerals are as follows:
1, infrared thermal imager, 2, glass for infrared rays, 3, drying box, 4, insulation box, 5, unsaturation soil body sample, 6, constant temperature
Heating plate, 7, electronic scale, 8, porous ceramic plate, 9, saturated salt solution, 10, hygrometer, 11, valve, 12, pipeline, 13, vacuum
Pump.
Specific embodiment
The principles of the present invention and feature are described below in conjunction with attached drawing, example is served only for explaining that this is practical
It is novel, it is not intended to limit the scope of the utility model.
As shown in Figure 1, a kind of device using infrared thermal imaging method measurement unsaturated soil thermal coefficient, including infrared heat
Imager 1, drying box 3, constant temperature heating plate 6, electronic scale 7, porous ceramic plate 8, hygrometer 10 and vacuum pump 13；The porous pottery
The drying box 3 is divided into upper and lower two layers by porcelain plate 8, and saturated salt solution 9, the drying are placed in the lower layer of the drying box 3
Window is offered on the one side on the upper layer of case 3, and closed set has glass for infrared rays 2 in the window；The drying box 3
It is placed with the electronic scale 7 in upper layer, the constant temperature heating plate 6 is placed on the electronic scale 7；The setting of hygrometer 10 exists
In the drying box 3；The vacuum pump 13 is arranged outside the drying box 3, and is connected to by pipeline 12 with the drying box 3,
Valve 11 is additionally provided on the pipeline 12；The infrared thermal imager 1 is arranged outside the drying box 3, and through described red
Outer glass 2 is opposite with the unsaturation soil body sample 5 being placed on the constant temperature heating plate 6.
In this embodiment, the insulation box 4 of one side opening is additionally provided on the electronic scale 7, and the insulation box 4 is opened
Mouthful one side face described in glass for infrared rays 2, the constant temperature heating plate 6 and described on the constant temperature heating plate 6
Unsaturation soil body sample 5 is placed in the insulation box 4, and is wrapped up by the insulation box 4.The unsaturation soil body sample 5 is
Cuboid-type structure.The solute of the saturated salt solution 9 is lithium chloride, potassium acetate, sodium bromide, copper chloride, sodium chloride, ammonium sulfate
Any one of with potassium sulfate.
Visual image can be converted for the infrared emanation on 5 surface of unsaturation soil body sample using infrared thermal imager 1,
Temperature is measured under contactless state, its Temperature Distribution will not be influenced because traditional thermal probe contacts measured target, and adopt
5 surface of unsaturation soil body sample that can be surveyed with infrared thermal imager 1 whole audience Temperature Distribution everywhere.In addition, saturated salt solution method
It is the suction control technique that unsaturated soil is commonly controlled in soil test, the saturated salt solution of different solutes corresponds to different
Steam pressure, therefore can be used to control the relative humidity of air, and it is linear between the suction of unsaturated soil and relative humidity
Relationship, so can control the matric suction of unsaturated soil using saturated salt solution.The basic skills of saturated salt solution method is benefit
With the relative humidity of the salting liquid control air of different solutes, allows water in soil sample to complete to migrate in vapour form, reach certain a pair
The saturation degree answered.
In the present invention, using infrared thermal imager 1 to the infrared ray of 5 surface emissivity of unsaturation soil body sample at
Picture to measure the whole audience temperature on 5 surface of unsaturation soil body sample, and acquires unsaturation soil body sample 5 by the distribution of temperature
Thermal coefficient.In the present embodiment, it is heated, is guaranteed non-in the bottom of unsaturation soil body sample 5 using constant temperature heating plate 6
It is saturated the boundary condition of 5 bottom constant temperature of soil body sample, the thermal coefficient of unsaturation soil body sample 5 is measured by Transient Method.Specifically
, heated at constant temperature is carried out to 5 bottom of unsaturation soil body sample by heated constant temperature heating plate 6, obtains 5 table of unsaturation soil body sample
The temperature change two dimensional image in face reads the Temperature Evolution in unsaturation soil body sample 5 with the point away from heat source different distance, passes through
It is fitted Temperature Distribution and curve, the thermal coefficient of unsaturation soil body sample 5 is obtained by the way of Transient Method.
In the present invention, tested unsaturation soil body sample 5 is placed in drying box 3, and 3 bottom of drying box is placed
Saturated salt solution, and vacuumized using vacuum pump 13, to control humidity in drying box 3, and then control unsaturation soil body sample 5
Saturation degree, while also reducing the convective heat transfer between unsaturation soil body sample 5 and air.
In the present invention, it opens a window on drying box 3 to the side of infrared thermal imager 1, installation glass for infrared rays 2 is simultaneously close
Envelope, so as to carry out thermal imaging to sample unsaturation soil body sample 5 in the case where guaranteeing that drying box 3 is completely closed.
In the present invention, unsaturation soil body sample 5 is placed on electronic scale 7, the saturation in replacement drying box 3
After salting liquid 9,5 mass of unsaturation soil body sample of different time, available unsaturation soil body sample are read by electronic scale 7
5 mistake (suction) water quality-time changing curve, by measuring the unsaturation soil body sample 5 under the different controls of saturated salt solutions 9
Mass change, the soil―structure interaction of available sample.
In the present invention, 8 lower layer of porous ceramic plate is placed with saturated salt solution 9, to control the humidity of air.It is dry
It is reserved with stomata at the top of dry case 3, connecting valve 11 and vacuum is connected to by pipeline 12 (specially pressure-resistant hose) on stomata
On pump 13, the air in drying box 3 is extracted out by vacuum pump 13.
In the present invention, glass for infrared rays 2 is installed and is sealed, has not only guaranteed that drying box 3 is completely closed, but also guaranteeing will not
Obstruct the propagation of infrared ray.
In the present invention, crystal and pure water preparation of the saturated salt solution 9 by solid salt, in order to ensure solution is in full
And state, it should ensure that the crystal (accounting for about half of solute or so) of part salt is undissolved in water in solution, and the crystal of salt
Liquid level or less should be immersed in.Solute selective chlorination lithium, potassium acetate, sodium bromide, copper chloride, the sodium chloride, sulphur of saturated salt solution
The relative humidity of the controls such as sour ammonium, potassium sulfate varies with temperature little salting liquid, avoids selecting other relative humidity to temperature
More sensitive salting liquid.The temperature of heating plate when migrating, therefore testing since the acute variation of temperature can be such that the intracorporal moisture of soil generates
Degree should control within the scope of 15~40 DEG C.
Utilize the as follows of utility model device measurement unsaturated soil thermal coefficient:
Step 1: the soil body of test being sized as the unsaturation soil body sample 5 of cuboid-type, and weighs and obtains it
Quality m.The sample that the same soil body is taken with cutting ring measures natural density ρ, the dry density ρ of sampledWith the relative density G of soil particles。
Step 2: constant temperature heating plate 6 is placed below unsaturation soil body sample 5, then by unsaturation soil body sample 5 together with perseverance
Warm heating plate 6 wraps up heat insulation box 4 in each boundary face together, reserves in face of the side of infrared thermal imager 1 without package.
Step 3: being put into saturated salt solution 9 in 3 bottom of drying box, and place porous ceramic plate 8, porous ceramics above it
High-precision electronic scale 7 is placed on plate 8, the unsaturation soil body sample 5 wrapped is placed on the pallet of electronic scale 7；Exist simultaneously
Hygrometer 10 is disposed in the upper layer of drying box 3.
Step 4: by drying box 3 it is closed after, open valve 11, vacuumize about 0.5h with vacuum pump 13, close valve 11, make
Unsaturation soil body sample 5 carries out water translocation under constant temperature conditions.
Step 5: every 12h reads qualitative data and record on primary electron scale 7, the quality to unsaturation soil body sample 5
Variation in for 24 hours is no more than 10 milligram hours, is considered as water translocation and has reached equilibrium state, records unsaturation soil body sample at this time
5 quality m'.It is according to the saturation degree for obtaining unsaturation soil body sample 5 at this timeWherein, ρwFor water
Density.
Step 6: constant temperature heating plate 6 being heated rapidly to a certain steady temperature, when reading different by infrared thermal imager 1
Between sample unsaturation soil body sample 5 surface temperature distribution.
Step 7: it is molten in this kind of saturated salt that unsaturation soil body sample 5 being obtained by the temperature profile data back analysis read
Thermal coefficient under the saturation degree that liquid is controlled.
Step 8: closing heat source, replace the saturated salt solution 9 in drying box 3, repeat step 3~7, measure different saturation
Under unsaturation soil body sample 5 thermal coefficient.The placement order of saturated salt solution 9 preferably according to control humidity from greatly to small, then
Sequence replacement from small to large.If crack occurs in unsaturation soil body sample 5 during test, should stop testing.
Step 9: the relationship between suction and saturation degree being obtained by statistics, also the available unsaturation soil body sample 5
Soil―structure interaction.
The advantages of the utility model and beneficial effect are:
1, while using the saturation degree of the saturated salt solution control unsaturated soil sample in drying box, sample bottom is utilized
Constant temperature heating plate heating, thermal coefficient of the unsaturated soil sample under different saturation is measured with Transient Method.
2, infrared thermal imaging technique measures style temperature, can both guarantee not contact sample in sensor, avoids passing heat
Pass generation interference, and the whole audience temperature of available specimen surface；
3, the air in drying box is extracted out by vacuum pump mostly, considerably reduce in temperature taking process specimen surface with
The convective heat transfer of air ensure that the precision of thermal conductivity measurement；
4, soil-water characteristic curve can be measured.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (5)
1. a kind of device using infrared thermal imaging method measurement unsaturated soil thermal coefficient, it is characterised in that: including infrared heat
Imager (1), drying box (3), constant temperature heating plate (6), electronic scale (7), porous ceramic plate (8), hygrometer (10) and vacuum pump
(13)；The drying box (3) is divided into upper and lower two layers by the porous ceramic plate (8), places in the lower layer of the drying box (3)
Have saturated salt solution (9), offers window, and closed set in the window on the one side on the upper layer of the drying box (3)
There are glass for infrared rays (2)；It is placed with the electronic scale (7) in the upper layer of the drying box (3), is placed on the electronic scale (7)
There are the constant temperature heating plate (6)；Hygrometer (10) setting is in the drying box (3)；Vacuum pump (13) setting exists
The drying box (3) outside, and is connected to by pipeline (12) with the drying box (3)；The infrared thermal imager (1) is arranged in institute
State drying box (3) outside, and through the glass for infrared rays (2) and the unsaturation soil body being placed on the constant temperature heating plate (6)
Sample (5) is opposite.
2. a kind of device using infrared thermal imaging method measurement unsaturated soil thermal coefficient according to claim 1,
It is characterized in that: being additionally provided with the insulation box (4) of one side opening on the electronic scale (7), and the one side of insulation box (4) opening is just
To the glass for infrared rays (2), the constant temperature heating plate (6) and the unsaturated soil being located on the constant temperature heating plate (6)
Body sample (5) is placed in the insulation box (4), and is wrapped up by the insulation box (4).
3. a kind of device using infrared thermal imaging method measurement unsaturated soil thermal coefficient according to claim 1 or 2,
It is characterized by: the unsaturation soil body sample (5) is cuboid-type structure.
4. a kind of device using infrared thermal imaging method measurement unsaturated soil thermal coefficient according to claim 1 or 2,
It is characterized by: the solute of the saturated salt solution (9) is lithium chloride, potassium acetate, sodium bromide, copper chloride, sodium chloride, ammonium sulfate
Any one of with potassium sulfate.
5. a kind of device using infrared thermal imaging method measurement unsaturated soil thermal coefficient according to claim 1 or 2,
It is characterized by: the pipeline (12) is equipped with valve (11).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820745616.5U CN208188025U (en) | 2018-05-18 | 2018-05-18 | A kind of device using infrared thermal imaging method measurement unsaturated soil thermal coefficient |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820745616.5U CN208188025U (en) | 2018-05-18 | 2018-05-18 | A kind of device using infrared thermal imaging method measurement unsaturated soil thermal coefficient |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916953A (en) * | 2019-05-06 | 2019-06-21 | 山东众途复合材料有限公司 | The measuring method of the thermal coefficient of gap shape heat-barrier material under superhigh temperature vacuum or inert atmosphere |
| CN110095374A (en) * | 2019-04-08 | 2019-08-06 | 三峡大学 | The device and method of soil-water characteristic curve is surveyed with salt solustion mehtod |
-
2018
- 2018-05-18 CN CN201820745616.5U patent/CN208188025U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110095374A (en) * | 2019-04-08 | 2019-08-06 | 三峡大学 | The device and method of soil-water characteristic curve is surveyed with salt solustion mehtod |
| CN109916953A (en) * | 2019-05-06 | 2019-06-21 | 山东众途复合材料有限公司 | The measuring method of the thermal coefficient of gap shape heat-barrier material under superhigh temperature vacuum or inert atmosphere |
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