CN106546557B - A kind of soil body unfrozen water content measurement apparatus and measuring method - Google Patents
A kind of soil body unfrozen water content measurement apparatus and measuring method Download PDFInfo
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- CN106546557B CN106546557B CN201610966116.XA CN201610966116A CN106546557B CN 106546557 B CN106546557 B CN 106546557B CN 201610966116 A CN201610966116 A CN 201610966116A CN 106546557 B CN106546557 B CN 106546557B
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- 239000002689 soil Substances 0.000 title claims abstract description 78
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 238000005259 measurement Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 238000007710 freezing Methods 0.000 claims description 68
- 230000008014 freezing Effects 0.000 claims description 68
- 239000007788 liquid Substances 0.000 claims description 52
- 238000001931 thermography Methods 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 7
- 238000002474 experimental method Methods 0.000 claims description 3
- 230000003020 moisturizing effect Effects 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 229920000742 Cotton Polymers 0.000 description 13
- 238000004321 preservation Methods 0.000 description 13
- 238000005538 encapsulation Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 8
- 239000004793 Polystyrene Substances 0.000 description 7
- 229920002223 polystyrene Polymers 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000001328 terahertz time-domain spectroscopy Methods 0.000 description 6
- 230000010287 polarization Effects 0.000 description 5
- 238000011160 research Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000007707 calorimetry Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 208000019155 Radiation injury Diseases 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
- G01N21/3586—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3554—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for determining moisture content
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3563—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing solids; Preparation of samples therefor
Abstract
The invention discloses a kind of soil body unfrozen water content measurement apparatus and measuring method.The soil body unfrozen water content measurement apparatus includes THz TDS systems, the sample molds system for loading soil sample, the temperature control system for adjusting soil sample temperature and the data collecting system for gathering soil sample measurement data；The THz TDS systems include beam splitter, THz transmitters, THz receivers and multiple speculums；Laser is divided into two beams by the beam splitter, and beam of laser is used to be radiated on THz transmitters to produce THz pulse, and another beam of laser is as detection light with passing through THz receivers jointly by the THz pulse of soil sample.The present invention measurement apparatus have high accuracy, real-time and it is simple to operate the characteristics of.
Description
Technical field
The present invention relates to a kind of soil body unfrozen water content measurement apparatus and measuring method, belongs to the measurement of soil body unfrozen water content
Field.
Background technology
Unfrozen water content test is an emphasis and difficulties in frozen soil scientific research.Under the conditions of subzero temperature, the soil body
In only part water undergo phase transition icing, so as to form the four phase soil bodys of water, ice, air, soil particle.Under the conditions of subzero temperature, water
There is important influence to the calorifics and mechanics physical property of frozen soil body with the content of ice.It is the required of progress frozen soil thermodynamic metering
Index, be frozen soil mechanics property change leading factor, therefore in frozen soil unfrozen water content test and research for frozen soil base
This calorifics and mechanical property have important researching value and meaning.However, how accurately quickly to test out unfrozen water content is
One problem.
Method of testing common at present has the calorimetry based on conservation of energy principle, the dielectric constant based on soil and volume
The time-domain reflectomer method of moisture content functional relation, based on soil to the linear of the absorption intensity of ray and its severe and moisture
The Computerized chromatographic identification technology method of relation, the proton based on different physics and chemical state produce different in the interference of radiofrequency field
Henan speed the NMR method of time.
The document of water method is not frozen by analyzing test both at home and abroad, calorimetry is that a principle is simple, precision is high, steady
Qualitative good traditional classical method, but this method operates and calculated comparatively laborious complexity.Computerized chromatographic identification technology method
Taken time and effort with NMR method, and most researchs can not effectively be implemented also in the exploratory stage, human body also can
Produce radiation injury.Time-domain reflectomer method determines unfrozen water content by determining the dielectric constant of soil layer, and this method possesses
The features such as speed is fast, cheap, portable, but the dielectric constant of soil is easily by physical factors such as soil property, temperature, severes
Influence.
The content of the invention
The present invention is intended to provide a kind of soil body unfrozen water content measurement apparatus and measuring method, the measurement apparatus have high-precision
Degree, real-time and it is simple to operate the characteristics of.
To achieve these goals, the technical solution adopted in the present invention is：
A kind of soil body unfrozen water content measurement apparatus, it is structurally characterized in that, including THz-TDS systems, for loading soil sample
Sample molds system, the temperature control system for adjusting soil sample temperature and the data acquisition for gathering soil sample measurement data
System；The THz-TDS systems include beam splitter, THz transmitters, THz receivers and multiple speculums；The beam splitter will swash
Light is divided into two beams, and beam of laser is used to be radiated on THz transmitters to produce THz pulse, and another beam of laser is as detection light with leading to
The THz pulse for crossing soil sample passes through THz receivers jointly；The temperature control signals of the measurement data including temperature control system and
The THz pulse crest value amplitude of THz pulse.
Thus laser is divided into two beams, a branch of to be used to be radiated on THz transmitters to produce THz pulse；Another Shu Zuowei detections
Light passes through THz receivers jointly with terahertz pulse, and terahertz pulse changes electric light crystalline substance in receiver by linear electro-optic effect
The index ellipsoid of body, so that the polarization state of detection light changes, therefore by polarization state detection means and prolong
When device can obtain the terahertz time-domain spectroscopy of sample.
According to an embodiment of the invention, further optimization can also be made to the present invention, below the skill to be formed after optimization
Art scheme：
Preferably, the THz-TDS systems also include delay system, and the delay system includes multiple speculums, the plurality of
Speculum is used to make as the laser delay of detection light to pass through THz receivers.
According to an embodiment of the invention, the beam of laser in two beams is radiated at THz transmittings after the reflection of the first speculum
On device, THz pulse caused by the THz transmitters passes through soil sample, Ran Houyi after the second speculum and the 3rd speculum successively
It is secondary by the 4th speculum and the 5th speculum reflection after by THz receivers；Another beam of laser in two beams is successively by the
Nine speculums, the 8th speculum, the 7th speculum and the 6th speculum pass through THz receivers.
In order to form polarization state to laser, it is provided with the light path between the THz receivers and the 6th speculum
Mirror.
The sample molds system includes mounting groove and cover plate；Die cavity is formed between the mounting groove and cover plate, the die cavity
It is interior provided with the pressing plate being inlaid in cover plate and the backing plate that is inlaid in mounting groove；It is provided between the pressing plate and backing plate and is fitted in mould
The test soil sample of intracavitary；It is preferred that it is provided with hole on the backing plate.
Preferably, the pressing plate and backing plate are the convex XPS in edge.
Preferably, the temperature control system include freezing control cabinet, upper cold Winchester disk and under cold Winchester disk, on this cold Winchester disk and
Under cold Winchester disk wrap the sample molds system；The upper cold Winchester disk has upper freezing liquid entrance and the outlet of upper freezing liquid, described
Under cold Winchester disk have lower freezing liquid entrance and lower freezing liquid outlet.
Preferably, the data collecting system includes computer terminal, data acquisition unit and thermal infrared imager；The number
Be connected according to the signal output part of collector with computer terminal, the signal input part of the data acquisition unit respectively with thermal infrared imager and
Temperature control system connects；The data acquisition unit is used for the temperature control signals and THz pulse of collecting temperature control system
THz pulse crest value amplitude；It is preferred that the thermal infrared imager has two；It is preferred that the thermal infrared imager is non-contact infrared heat
As instrument.Two thermal infrared imagers are respectively used to the hole for the backing plate being aligned in sample molds system.
Based on same inventive concept, above-mentioned soil body unfrozen water content measurement apparatus is utilized present invention also offers a kind of
The method measured to soil body unfrozen water content, it comprises the following steps：
S1, soil sample is loaded into sample molds system,
S2, start THz-TDS systems, laser is divided into by two beams by beam splitter, beam of laser is used to be radiated at THz-TDS
THz pulse is produced on the THz transmitters of system, another beam of laser is passed through jointly as detection light with the THz pulse by soil sample
The THz receivers of THz-TDS systems；
The multistage adjustment soil temperature of S3, temperature control system, THz-TDS systems at a temperature of data collecting system is gathered per one-level
The THz wave peak amplitude and peak delay that system detects, the unfrozen water content at a temperature of analyzing per one-level.
According to a preferred embodiment of the invention, before measurement, soil is put into after being dried in baking oven the compactness according to needed for experiment
Soil sample is prepared with moisture content, soil sample, which is put into, to stand in moisturizing vessel is uniformly distributed soil sample moisture, then soil sample is compacted in flakes
And be nested in temperature control system upper cold Winchester disk and under between cold Winchester disk, thermal infrared imager is aligned to the sample of sample molds system
Product backing plate, the freezing control cabinet of thermal infrared imager, temperature control system is adopted by the data of signal wire and data collecting system
The signal input part connection of storage, the signal output part of the data acquisition unit and the computer terminal of data collecting system connect；
During measurement, start THz-TDS systems, start computer；Will freezing control cabinet temperature setting be 0 DEG C, -0.5 DEG C, -1
℃、-1.5℃、-2℃、-2.5℃、-3℃、-4℃、-4.5℃、-5℃、-5.5℃、-6℃、-6.5℃、-7℃、-7.5℃、-8
℃、-8.5℃、-9℃、-9.5℃、-10℃；At a temperature of each control of final data collector collection freezing control cabinet
The THz wave peak amplitude and peak delay that THz-TDS system detectios arrive, at a temperature of the analysis freezing each control of control cabinet
Unfrozen water content.
The terahertz emission of the present invention typically refers to frequency in 0.1-10THz（Wavelength is 30 μm of -3mm）Between electromagnetism
Ripple, wave band are between microwave and infrared ray, belong to Far infrared electric magnetic radiation category.Terahertz time-domain spectroscopy（terahertz
Time-domain spectroscopy, THz-TDs）Analytical technology is a kind of non-contact survey technology.Ultrafast laser technique it is fast
The generation that speed develops into THz pulse provides stabilization, reliable LASER Light Source, THz spectrums is had higher signal to noise ratio.Terahertz
Time-domain spectroscopy system（THz-TDs）It is used widely in many research fields, the big thing molecular recognition of such as biology, material is ground
Study carefully, explosive detection, have application in drugs of abuse.Compared with other method, terahertz time-domain spectroscopic technology of the invention is
A kind of nondestructive, unionized, and the efficient detection technique of high sensitivity, have good penetrability, safe, low energy,
Innocuousness and it is high-precision the features such as, and terahertz time-domain spectroscopy provides very high noise for the transmitted spectrum of sample
Than.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention has high accuracy, real-time and simple to operate etc.
Advantage.Compare and experimental rig is placed in temperature-controlled cabinet, temperature is applied directly to accounting for for experimental rig is saved on sample
With space, while temperature control efficiency is also improved, reduce power consumption.
Brief description of the drawings
Fig. 1 is the structure principle chart of an embodiment of the present invention；
Fig. 2 is the sample structure schematic diagram and temperature control system schematic diagram of the present invention；
Fig. 3 is the cold Winchester disk structure top view of the present invention, and dotted line is freezing liquid torus；
Fig. 4 is the sample cover plate top view of the present invention；
Fig. 5 is the sample aluminum mounting groove backing plate top view of the present invention.
In figure
1. femtosecond laser；2. beam splitter；3. detect light；4. the first speculum；5.THz transmitters；6. the second speculum；7.
3rd speculum；8. soil sample；9. the 4th speculum；10. the 5th speculum；11.THz receivers；12. lens；13. delay system
System；14. the 6th speculum；15. the 7th speculum；16. the 8th speculum；17. the 9th speculum；The upper cold Winchester disks of 8-1.；8-2.
Under cold Winchester disk；The upper freezing liquid entrances of 8-3.；Freezing liquid entrance under 8-4.；8-5. hexagonal (hexagon)nut；8-6. hex screw；8-7. pressure
Plate；8-8. cover plate；8-9. tests soil sample；8-10. backing plate；8-11. mounting groove；8-12. hexagonal (hexagon)nut；8-13. hex screw；8-
14. freezing liquid exports on；Freezing liquid exports under 8-15.；The upper freezing liquid outlet conduits of 8-16.；Freezing liquid outlet under 8-17.
Road；8-18. freezing liquid outlet conduit；The upper freezing liquid inlet ducts of 8-19.；Freezing liquid inlet duct under 8-20.；8-21. freezing
Liquid inlet duct；8-22. freeze control cabinet；8-23. wire；8-24. data acquisition unit；8-25. outer thermal imaging system；It is 8-26. infrared
Thermal imaging system；8-27. wire；8-28. computer terminal.
Embodiment
Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that in the feelings not conflicted
Under condition, the feature in embodiment and embodiment in the present invention can be mutually combined.For sake of convenience, hereinafter as occurred
" on ", " under ", "left", "right" printed words, only represent that the upper and lower, left and right direction with accompanying drawing in itself is consistent, do not act limiting to structure
It is set for using.
A kind of soil body unfrozen water content measurement apparatus based on THz-TDS systems, including THz-TDS systems, sample molds
System, temperature control system and data collecting system.Wherein THz-TDS systems have good penetrability, safe, low energy and
The features such as high-precision, THz pulse（That is THz wave）Peak amplitude reduces with aqueous volume index after through soil sample, peak delay with
Water content is linearly increasing；Sample molds system is made up of the excellent aluminium base disk of heat conductivility and polystyrene disk, detachable weight
It is multiple to use；Temperature control system is circulated using freezing liquid, reduces sample temperature, and sample temperature uses high-precision non-contact infrared
Thermal imaging system measures；The data such as the real-time collecting temperature of data collecting system, THz wave peak amplitude and peak delay.
As shown in figure 1, the THz-TDS systems include femtosecond laser 1, beam splitter 2, detection light 3, the first speculum 4,
THz transmitters 5, the second speculum 6, the 3rd speculum 7, soil sample 8, the 4th speculum 9, the 5th speculum 10, THz receivers
11st, lens 12, delay system 13, the 6th speculum 14, the 7th speculum 15, the 8th speculum 16, the 9th speculum 17.
As shown in Fig. 2 sample molds system, temperature control system and the data collecting system include：
Upper cold Winchester disk 8-1 as shown in Figure 3, internal diameter 3cm, external diameter 13cm, thick 4cm, heat-preservation cotton parcel；
Under cold Winchester disk 8-2, internal diameter 3cm, external diameter 13cm, thick 4cm, heat-preservation cotton parcel；
Upper freezing liquid entrance 8-3, heat-preservation cotton parcel；
Lower freezing liquid entrance 8-4, heat-preservation cotton parcel；
Hexagonal (hexagon)nut 8-5, M3 type；
Hex screw 8-6, M3 type；
Polystyrene pressing plate 8-7, diameter 3cm, thick 3mm, the convex 15mm of platen edge are arranged to clamp styles；
Aluminum cover 8-8 as shown in Figure 3, annulus, internal diameter 3cm, external diameter 103cm, thick 3mm, convex 15mm is set under side edge thereof
It is set to clamp styles；
Soil sample 8-9, diameter 10cm, thick 2mm；
Polystyrene backing plate 8-10 as shown in Figure 4, diameter 3cm, thick 3mm, the convex 15mm of side edge thereof are arranged to fastener
Form, the circular hole away from symmetrical a diameter of 5mm at edge 5mm；
Aluminum mounting groove 8-11, internal diameter, 3cm, external diameter 10cm, cell wall thickness 03cm, the convex 15mm of side edge thereof are arranged to detain
Part form；
Hexagonal (hexagon)nut 8-12, M3 type；
Hex screw 8-13, M3 type；
Upper freezing liquid exports 8-14, heat-preservation cotton sealing；
Lower freezing liquid exports 8-15, heat-preservation cotton sealing；
Upper freezing liquid outlet conduit 8-16, heat-preservation cotton parcel；
Lower freezing liquid outlet conduit 8-17, heat-preservation cotton parcel；
Freezing liquid outlet conduit 8-18, heat-preservation cotton parcel；
Upper freezing liquid inlet duct 8-19, heat-preservation cotton parcel；
Lower freezing liquid inlet duct 8-20, heat-preservation cotton parcel；
Freezing liquid inlet duct 8-21, heat-preservation cotton parcel；
Freeze control cabinet 8-22, -100 DEG C of scope -30 DEG C, 005 DEG C of precision；
Wire 8-23；
Data acquisition unit 8-24；
Non-contact infrared thermal imaging system 8-25, -100 DEG C of scope -30 DEG C, 0.05 DEG C of precision；
Non-contact infrared thermal imaging system 8-26, -100 DEG C of scope -30 DEG C, 0.05 DEG C of precision；
Wire 8-27；
Computer terminal 8-28.
During measurement, femtosecond laser is divided into two beams using beam splitter, it is a branch of to be used to be radiated on THz transmitters 5 to produce THz
Pulse；Another Shu Zuowei detection light passes through THz receivers 11 jointly with terahertz pulse, and terahertz pulse is imitated by linear electrooptic
The index ellipsoid of electro-optic crystal in receiver should be changed, so that the polarization state of detection light changes, therefore passed through
Polarization state detection means and time-delay mechanism can obtain the terahertz time-domain spectroscopy of sample.In order to prevent water vapor in air pair
The absorption of THz ripples, whole experimental system are placed in dry laboratory, and constant temperature is room temperature.
The encapsulation process for testing soil sample is as follows：
1）Soil is put into baking oven and dries 24h, takes out after drying and is sieved with 2mm, the compactness according to needed for experiment
And moisture content, soil sample is prepared, being put into standing 24h in moisturizing glass dish is uniformly distributed soil sample moisture；
2）Polystyrene backing plate mouth is entered in aluminum mounting groove, soil sample is then put into aluminum mounting groove, uses tablet press machine
Compacting is in blocks, final sample diameter 10cm, thickness of sample 2mm；
3）Aluminum cover is covered on sample, polystyrene cover plate mouth is entered in Aluminum cover；
4）By the soil sample handled well be nested in upper cold Winchester disk, under between cold Winchester disk, with M3 types screw by upper cold Winchester disk, under it is cold
Winchester disk closely connects；
5）Upper freezing liquid inlet duct is closely connected with upper freezing liquid entrance, encapsulation process；
6）Lower freezing liquid inlet duct is closely connected with lower freezing liquid entrance, encapsulation process；
7）Upper freezing liquid outlet conduit is closely connected with the outlet of upper freezing liquid, encapsulation process；
8）Lower freezing liquid outlet conduit is closely connected with the outlet of lower freezing liquid, encapsulation process；
9）T-shaped PVC joints is close upper freezing liquid inlet duct, lower freezing liquid inlet duct and freezing liquid inlet duct
Connection, encapsulation process；
10）T-shaped PVC joints is tight upper freezing liquid outlet conduit, lower freezing liquid outlet conduit and freezing liquid outlet conduit
Close connection, encapsulation process；
11）Freezing liquid inlet duct is closely connected with freezing control cabinet, encapsulation process；
12）Freezing liquid outlet conduit is closely connected with freezing control cabinet, encapsulation process；
13）By heat-preservation cotton upper cold Winchester disk, under cold Winchester disk, upper freezing liquid inlet duct, lower freezing liquid inlet duct, freezing
Liquid inlet duct, upper freezing liquid outlet conduit, lower freezing liquid outlet conduit and freezing liquid outlet conduit tight, reduce energy
Consumption；
14）Non-contact infrared thermal imaging system is directed at polystyrene backing plate left side circular hole；
15）By circular hole on the right side of non-contact infrared thermal imaging system alignment polystyrene backing plate；
16）By wire freezing control cabinet, left side non-contact infrared thermal imaging system and right side non-contact infrared thermal imaging system
It is connected with data acquisition unit；
17）Wire is connected data acquisition unit with computer terminal；
18）Start THz-TDS systems, start computer；
19）Will freezing control cabinet temperature setting be 0 DEG C, -0.5 DEG C, -1 DEG C, -1.5 DEG C, -2 DEG C, -2.5 DEG C, -3 DEG C, -4
℃、-4.5℃、-5℃、-5.5℃、-6℃、-6.5℃、-7℃、-7.5℃、-8℃、-8.5℃、-9℃、-9.5℃、-10℃；
20）By the THz wave peak amplitude that arrives of THz-TDS system detectios at a temperature of each freezing control cabinet control and
Peak delay, analyze the unfrozen water content at a temperature of each freezing control cabinet control.
The content that above-described embodiment illustrates should be understood to that these embodiments are only used for being illustrated more clearly that the present invention, without
For limiting the scope of the present invention, after the present invention has been read, the various equivalent form of values of the those skilled in the art to the present invention
Modification each fall within the application appended claims limited range.
Claims (9)
- A kind of 1. soil body unfrozen water content measurement apparatus, it is characterised in that the sample including THz-TDS systems, for loading soil sample Product mold system, the temperature control system for adjusting soil sample temperature and the data acquisition system for gathering soil sample measurement data System；The THz-TDS systems include beam splitter（2）, THz transmitters（5）, THz receivers（11）With multiple speculums；Described point Shu Jing（2）Laser is divided into two beams, beam of laser is used to be radiated at THz transmitters（5）Upper generation THz pulse, another beam of laser As detection light and pass through soil sample（8）THz pulse pass through THz receivers jointly（11）；The measurement data includes temperature control The temperature control signals of system processed and the THz pulse crest value amplitude of THz pulse；The sample molds system includes mounting groove（8-11）And cover plate（8-8）；The mounting groove（8-11）And cover plate（8-8）It Between form die cavity, be provided with the die cavity and be inlaid in cover plate（8-8）Interior pressing plate（8-7）Be inlaid in mounting groove（8-11）Interior pad Plate（8-10）；The pressing plate（8-7）And backing plate（8-10）Between be provided with and be fitted in test soil sample in die cavity（8-9）；The data collecting system includes computer terminal（8-28）, data acquisition unit（8-24）And thermal infrared imager；The number According to collector（8-24）Signal output part and computer terminal（8-28）Connection, the data acquisition unit（8-24）Signal input part It is connected respectively with thermal infrared imager and temperature control system；The data acquisition unit（8-24）For collecting temperature control system The THz pulse crest value amplitude of temperature control signals and THz pulse；The temperature control system includes freezing control cabinet（8-22）, upper cold Winchester disk（8-1）The cold Winchester disk with（8-2）, it is cold on this Winchester disk（8-1）The cold Winchester disk with（8-2）Wrap the sample molds system；The upper cold Winchester disk（8-1）Enter with upper freezing liquid Mouthful（8-3）Exported with upper freezing liquid（8-14）, cold Winchester disk under described（8-2）With lower freezing liquid entrance（8-4）With lower freezing liquid Outlet（8-15）.
- 2. soil body unfrozen water content measurement apparatus according to claim 1, it is characterised in that the THz-TDS systems are also Including delay system（13）, the delay system（13）Including multiple speculums, the plurality of speculum is used to make as detection light THz receivers are passed through in laser delay（11）.
- 3. soil body unfrozen water content measurement apparatus according to claim 1, it is characterised in that the beam of laser warp in two beams Cross the first speculum（4）THz transmitters are radiated at after reflection（5）On, the THz transmitters（5）Caused THz pulse passes through successively Second speculum（6）With the 3rd speculum（7）Soil sample is passed through afterwards（8）, then in turn through the 4th speculum（9）With the 5th reflection Mirror（10）By THz receivers after reflection（11）；Another beam of laser in two beams passes through the 9th speculum successively（17）, it is the 8th anti- Penetrate mirror（16）, the 7th speculum（15）With the 6th speculum（14）By THz receivers（11）.
- 4. soil body unfrozen water content measurement apparatus according to claim 3, it is characterised in that the THz receivers（11） With the 6th speculum（14）Between light path on be provided with lens（12）.
- 5. soil body unfrozen water content measurement apparatus according to claim 1, it is characterised in that the backing plate（8-10）On open There is hole.
- 6. soil body unfrozen water content measurement apparatus according to claim 5, it is characterised in that the pressing plate（8-7）And pad Plate（8-10）It is the convex XPS in edge.
- 7. the soil body unfrozen water content measurement apparatus according to claim 1 or 6, it is characterised in that the thermal infrared imager There are two；The thermal infrared imager is non-contact infrared thermal imaging system.
- 8. a kind of soil body unfrozen water content measurement apparatus using described in one of claim 1-7 is carried out to soil body unfrozen water content The method of measurement, it is characterised in that comprise the following steps：S1, soil sample is loaded into sample molds system,S2, start THz-TDS systems, pass through beam splitter（2）Laser is divided into two beams, beam of laser is used to be radiated at THz-TDS The THz transmitters of system（5）Upper generation THz pulse, another beam of laser is as detection light and passes through soil sample（8）THz pulse be total to With the THz receivers Jing Guo THz-TDS systems（11）；The multistage adjustment soil temperature of S3, temperature control system, THz-TDS systems are examined at a temperature of data collecting system is gathered per one-level The THz wave peak amplitude and peak delay measured, the unfrozen water content at a temperature of analyzing per one-level.
- 9. the method according to claim 8 measured to soil body unfrozen water content, it is characterised in that, will before measurement Soil is put into baking oven after drying compactness and moisture content preparation soil sample according to needed for experiment, and soil sample is put into moisturizing vessel and stood Soil sample moisture is uniformly distributed, then soil sample is compacted in flakes and is nested in the upper cold Winchester disk of temperature control system（8-1）It is cold with Winchester disk（8-2）Between, by thermal infrared imager be aligned sample molds system sample backing plate, by thermal infrared imager, temperature control system The freezing control cabinet of system is connected by the signal input part of signal wire and the data acquisition unit of data collecting system, the data acquisition The signal output part of device and the computer terminal of data collecting system connect；During measurement, start THz-TDS systems, start computer；Will freezing control cabinet temperature setting be 0 DEG C, -0.5 DEG C, -1 DEG C, - 1.5℃、-2℃、-2.5℃、-3℃、-4℃、-4.5℃、-5℃、-5.5℃、-6℃、-6.5℃、-7℃、-7.5℃、-8℃、- 8.5℃、-9℃、-9.5℃、-10℃；THz-TDS at a temperature of each control of final data collector collection freezing control cabinet The THz wave peak amplitude and peak delay that system detectio arrives, the water that do not freeze at a temperature of the analysis freezing each control of control cabinet contain Amount.
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| CN108267420A (en) * | 2017-12-22 | 2018-07-10 | 深圳市太赫兹系统设备有限公司 | Seed aqueous amount detection systems and method |
| CN108680483B (en) * | 2018-05-23 | 2020-05-08 | 中南大学 | Soil body in-situ permeability coefficient measuring device and testing method |
| CN109490243A (en) * | 2018-12-29 | 2019-03-19 | 深圳职业技术学院 | The system and monitoring method of material appearance during on-line monitoring microwave freeze-drying |
| CN109682853B (en) * | 2019-01-09 | 2024-02-13 | 南京大学 | FBG-based frozen soil ice content distributed in-situ measurement method and device |
| CN110274922A (en) * | 2019-06-04 | 2019-09-24 | 东南大学 | A kind of method of continuous monitoring soil body moisture migration |
| CN113189611B (en) * | 2021-04-30 | 2023-03-31 | 北京理工大学 | Terahertz backscattering signal-based soil temperature and humidity detection method |
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