CN102590016A - Soil moisture characteristic curve measurement device and measurement method thereof - Google Patents
Soil moisture characteristic curve measurement device and measurement method thereof Download PDFInfo
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- CN102590016A CN102590016A CN2012100349719A CN201210034971A CN102590016A CN 102590016 A CN102590016 A CN 102590016A CN 2012100349719 A CN2012100349719 A CN 2012100349719A CN 201210034971 A CN201210034971 A CN 201210034971A CN 102590016 A CN102590016 A CN 102590016A
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Abstract
The invention relates to a soil moisture characteristic curve measurement device and a measurement method thereof. The soil moisture characteristic curve measurement device is characterized by comprising a pressure container, an electronic balance, a ceramic plate part, a drainage system, an air inlet system and a controller; the pressure container comprises a pressure cooker body and a pressure container cover arranged on the pressure cooker body; the electronic balance is arranged in the pressure cooker body; the electronic balance is electrically connected with the controller; the ceramic plate part is arranged on the electronic balance and comprises a ceramic plate and ceramic plate sealing rubber which are arranged on upper and lower layers respectively; the ceramic plate is provided with a water outlet and is provided with a plurality of soil samples; the drainage system comprises a water outlet pipe which is connected with the water outlet on the ceramic plate; the end of the water outlet pipe, which penetrates through the pressure cooker body is provided with a solenoid valve which is electrically connected with the controller; the air inlet system comprises a high-pressure air source which is connected with the inner side of the pressure cooker body through an air inlet pipe; the air inlet pipe is sequentially provided with an electronic control pressure reducing valve and a pressure sensor; and the electronic control pressure reducing valve and the pressure sensor are both electrically connected with the controller which is arranged outside the pressure cooker body.
Description
Technical field
The present invention relates to the soil physics field, particularly about a kind of characteristic curve of soil moisture measurement mechanism and measuring method thereof.
Background technology
Characteristic curve of soil moisture also is called soil characteristic curve or soil pF curve, and it has explained the relation between soil water potential and the soil water content.The pressure membrane appearance is present widely used characteristic curve of soil moisture surveying instrument equipment, accepts extensively this equipment in the world and measures the data that obtain, and all there is application in a lot of at home and abroad fields.Its principle is in the container of a sealing, to inflate pressurization with gases at high pressure (like high pressure nitrogen), and pressure limit is adjustable, is generally 0～15bar (crust, pressure unit).Pedotheque places pressure vessel, is lined with special ceramic wafer under the pedotheque, is used for through its draining.Because gas can not pass through ceramic wafer, therefore, can keep the pressure stability in the pressure vessel.Under steady pressure, carry out draining, the moisture of discharging in the soil under the steady pressure is transferred to the pressure vessel outside through ceramic wafer, treat that the draining of pedotheque is accomplished; Moisture keeps constant back to take out pedotheque; Weigh, oven dry is weighed again; Measure the water cut of pedotheque, thereby obtain soil moisture content corresponding under the above-mentioned set pressure.Under other set pressures, repeat above-mentioned steps, measure the pairing soil moisture content of different pressures, then obtain characteristic curve of soil moisture.
The standard step that characteristic curve of soil moisture is measured is following.The saturated soil sample is placed on the fully saturated ceramic wafer, and it is continuous to require pedotheque and ceramic wafer to set up reliable waterpower, puts it in the pressure vessel then and pressurizes, and generally on ceramic wafer, places a plurality of pedotheques.After being issued to hydraulic equilibrium in a certain set pressure, with (being generally 3-6) pedotheque taking-up of some, to weigh, oven dry is weighed again, calculates soil moisture content under this set pressure.Pedotheque after oven dry is no longer reused.Continue to be forced into next set pressure with remaining pedotheque again, and then the pedotheque of some is taken out, weigh, oven dry is weighed again, calculates the soil moisture content under this set pressure.So repeat said process, need all spot pressures and the corresponding soil moisture content thereof measured until completion.This standard method need prepare a large amount of pedotheques, and needs repeatedly opening and closing pressure vessel, pressurization equilibration again under new set pressure.Above-mentioned steps will consume great amount of time, according to the quantity of soil types and spot pressure to be determined, generally accomplishes the time that a complete characteristic curve of soil moisture measurement needs 1～3 month, and the concrete time is relevant with the character of measured soil.
Characteristic curve of soil moisture is measured the testing procedure that can also adopt a kind of simplification.Wherein, steps such as the preparation of pedotheque are the same, and measuring process has certain difference.When pedotheque to be measured reaches hydraulic equilibrium in the pressure chamber after, take out pedotheque, the weighing weight in wet base; Then the pedotheque that takes out (saturated again back) is put into pressure vessel and utilize again, and add water, make it keep reliable waterpower continuous at pedotheque and ceramic wafer surface of contact.Repeat said process, until accomplishing the measurement that all measure spot pressure.Take out pedotheque the last time, after the weighing weight in wet base, oven dry, weighing dry weight again, and calculate the corresponding soil moisture content of all gaging pressure points.This method has farthest reduced the quantity of required pedotheque.But because the pedotheque of recycling need to rebulid waterpower continuous with ceramic wafer, operation being difficult to be guaranteed; Simultaneously, because this mode also need set at each and open test pressure point under and the seal-off pressure container, the taking-up pedotheque, and the pedotheque that reuses and ceramic wafer are obtained waterpower again and are also wanted elapsed time continuously.Therefore, the time that the testing procedure of this simplification consumes is longer than standard step, and it is relatively poor that the pedotheque of recycling and ceramic wafer are obtained the waterpower continued reliability again, and owing to the influence of soil hysteresis quality, the repeatability of measurement or precision also are difficult to guarantee simultaneously.
Summary of the invention
To the problems referred to above; The purpose of this invention is to provide and a kind ofly need not prepare a large amount of pedotheques; Can guarantee that reliable waterpower is continuous, efficiency of measurement and precision are high, and in the certain pressure scope, can accomplish device and the measuring method thereof that characteristic curve of soil moisture is measured continuously automatically.
For realizing above-mentioned purpose; The present invention takes following technical scheme: a kind of characteristic curve of soil moisture measurement mechanism is characterized in that: it comprises a pressure vessel, an electronic balance, ceramic wafer parts, a cover unwatering system, a cover air inlet system and a controller; Said pressure vessel comprises pressure cooker body and the pressure container cover that is arranged on its top; Said electronic balance is arranged in the said pressure cooker body, and said electronic balance is electrically connected said controller; Said ceramic wafer parts are arranged on the said electronic balance, and said ceramic wafer parts comprise ceramic wafer and the ceramic wafer caulking gum that lower leaf is provided with, and said ceramic wafer is provided with a water delivering orifice; Said ceramic wafer is provided with some pedotheques; Said unwatering system comprises the rising pipe that connects said the above water delivering orifice of ceramic wafer, and the end that said rising pipe passes said pressure cooker body is provided with a solenoid valve, and said solenoid valve is electrically connected said controller; Said gas handling system comprises high-pressure air source, and said high-pressure air source connects in the said pressure cooker body through draft tube, is disposed with electronic control pressure reducing valve and pressure transducer on the said draft tube; Said electronic control pressure reducing valve and pressure transducer all are electrically connected said controller; Said controller is arranged on the outside of said pressure cooker body.
Said ceramic wafer parts are arranged on the said electronic balance through some back-up blocks.
Said pedotheque comprises soil and cutting ring, and said soil is arranged in the said cutting ring.
Said rising pipe in the said unwatering system comprises the flexible steel in flat section tubing that always connects the said water delivering orifice of said ceramic wafer in succession; Said flexible steel in flat section tubing connects one pot of body rising pipe; Said pot body rising pipe passes said pressure cooker body, and said solenoid valve is arranged on the said pot body rising pipe.
The measuring method of above-mentioned a kind of characteristic curve of soil moisture measurement mechanism; It may further comprise the steps: the characteristic curve of soil moisture in the pressure limit of 1) measuring as required; Choose the ceramic wafer parts of some pressure ratings; The pressure limit that the ceramic wafer parts of each pressure rating are corresponding certain is measured the pedotheque on each ceramic wafer parts according to pressure rating order from small to large; 2) the ceramic wafer parts that will obtain continuous some pedotheques of waterpower and certain pressure grade are placed on the electronic balance in the pressure cooker body; It is external that water delivering orifice on the ceramic wafer is connected pressure cooker through rising pipe; Pressure cooker body and pressure container cover is airtight; High-pressure air source is connected in the pressure cooker body through its draft tube that is provided with electronic control pressure reducing valve and pressure transducer; 3) open through the solenoid valve on the controller control rising pipe; 4) in the pressure cooker body, feed gases at high pressure through draft tube through controller control high-pressure air source; Control electronic control pressure reducing valve and pressure transducer simultaneously; Regulate the gases at high pressure that feed in the pressure cooker body, make a set pressure in the pressure limit that reaches corresponding in the pressure cooker body with the ceramic wafer parts of this pressure rating; 5) moisture in the pedotheque gets into the space that forms between ceramic wafer and the ceramic wafer caulking gum through the ceramic wafer internal void, and it is external that the water delivering orifice on ceramic wafer, and rising pipe then flows to pressure cooker; 6) under this set pressure, after soil suction and the vessel internal pressure dynamic balance, do not open the pressure cooker body, directly the weight of all experimental provisions on pressure cooker in-vivo measurement pedotheque and electronic balance; Pressure boost is weighed after the balance to next set pressure; Weight difference after twice balance is the displaced weight of pedotheque under corresponding set pressure and the pressure differential; Pressure boost repeats said process to next set pressure once more, and the measurement in the corresponding pressure limit of the ceramic wafer parts of this grade finishes; After the last balance, open pressure vessel, the weight in wet base of measured soil sample, the oven dry pedotheque, measured soil sample dry weight is calculated the corresponding soil moisture content of last set pressure; Reach the corresponding water discharge of each set pressure before by the corresponding soil moisture content of last set pressure; Calculate the soil moisture content under each set pressure successively, accomplish the corresponding interior characteristic curve of soil moisture of pressure limit of ceramic wafer parts of this grade and measure; 7) the ceramic wafer parts of the next pressure rating of replacing, repeating step 2) to 6), the characteristic curve of soil moisture in the corresponding pressure limit of the ceramic wafer parts of accomplishing this pressure rating after changing is measured; 8) with the arrangement of the characteristic curve of soil moisture in each pressure limit, combination, the whole piece characteristic curve of soil moisture in the pressure limit that completion needs to measure.
The present invention is owing to take above technical scheme; It has the following advantages: 1, the present invention puts into pressure vessel inflation pressurization with the pedotheque for preparing; Setting under the test pressure; After soil suction and the pressure equilibrium, do not open pressure vessel, directly the weight of all experimental provisions on measured soil sample and the electronic balance in pressure vessel; Pressure boost is weighed behind the ready to balance to next set pressure again; Weight difference after twice balance is the displaced weight of pedotheque under corresponding set pressure and the pressure differential; Repeating said process finishes until measuring; After the last balance, open pressure vessel, the weight in wet base of measured soil sample, the oven dry pedotheque, measured soil sample dry weight is calculated the corresponding soil moisture content of last set pressure; Reach the corresponding water discharge of each set pressure before by the corresponding soil moisture content of last set pressure, calculate the soil moisture content under each set pressure successively, the characteristic curve of soil moisture of accomplishing in this pressure limit is measured; The present invention is not owing to need open under each set pressure and the seal-off pressure container; Equilibrium process after not needing release and pressurizeing once more; Therefore; Shortened Measuring Time, the hysteresis quality influence of having avoided pedotheque and ceramic wafer to obtain the continuous process of waterpower again and bring thus, thus farthest improved efficiency of measurement and precision.2, the present invention is owing to be provided with electronic balance in pressure vessel; The direct water discharge of measured soil sample in pressure vessel; Pedotheque can be reused, and therefore, has solved the pedotheque that all needs some at each set pressure point; Need a large amount of soil testing sample of preparation, and this process problem such as more consuming time.3, therefore the present invention, has solved the successional problem of the reliable waterpower of soil and ceramic wafer owing to reuse identical pedotheque at each gaging pressure point, and the lag-effect brought of moistening again pedotheque etc. is to the influence of measuring accuracy.4, measurement mechanism of the present invention is under the control of controller, and each execution unit cooperation is accomplished by device in the measurement in each equilibrium pressure force automatically, has avoided the repeatedly error of weighing, has improved the measuring accuracy of system.5, apparatus of the present invention can in the certain pressure scope, be accomplished the measurement of characteristic curve of soil moisture according to the measuring process of setting automatically under the control of controller, have farthest reduced human cost.Measuring process of the present invention is automatically accomplished under the control of controller fully, and automaticity is high, does not need release and pressurization equilibration process once more, has shortened Measuring Time; Need not prepare a large amount of pedotheques, can guarantee that the reliable waterpower of pedotheque and ceramic wafer is continuous, measurement mechanism is simple in structure, and is convenient and practical, and reliable operation can be widely used in the measuring process of characteristic curve of soil moisture.
Description of drawings
Fig. 1 is a structural representation of the present invention
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is carried out detailed description.
As shown in Figure 1, the present invention includes a pressure vessel 1, an electronic balance 2, ceramic wafer parts 3, a cover unwatering system 4, a cover air inlet system 5 and a controller 6.
Pressure vessel 1 of the present invention comprises pressure cooker body 11, and pressure cooker body 11 tops are provided with pressure container cover 12.
Ceramic wafer parts 3 of the present invention are arranged on the electronic balance 2, support through some back-up blocks 7 between electronic balance 2 and the ceramic wafer parts 3.Ceramic wafer parts 3 comprise the ceramic wafer caulking gum 31 and ceramic wafer 32 of higher slice setting down; Be that ceramic wafer caulking gum 31 is positioned at lower floor; Ceramic wafer 32 is positioned at the upper strata, forms the space between ceramic wafer 32 and the ceramic wafer caulking gum 32, and ceramic wafer 32 is provided with a water delivering orifice 33.Ceramic wafer 32 is provided with some pedotheques 8, and pedotheque 8 comprises soil 81 and cutting ring 82, and soil 81 is arranged in the cutting ring 82.
Unwatering system 4 of the present invention comprises the flexible steel in flat section tubing 41 of the ceramic wafer 32 upper water-out mouths 33 that connect ceramic wafer parts 3; The corresponding connection one of the output terminal of flexible steel in flat section tubing 41 is arranged on the pot body rising pipe 42 on the pressure cooker body 11; The end that pot body rising pipe 42 passes pressure cooker body 11 is provided with a miniature electromagnetic valve 43 (the water delivering orifice diameter is below 5mm), and miniature electromagnetic valve 43 is connected with controller 6 through a control line of electromagnetic valve 44.
Gas handling system 5 of the present invention comprises high-pressure air source 51, and high-pressure air source 51 is connected in the pressure cooker body 11 through draft tube 52, is disposed with electronic control pressure reducing valve 53 and pressure transducer 54 on the draft tube 52; Electronic control pressure reducing valve 53 is connected in controller 6 through valve control line 55, and pressure transducer 54 is connected in controller 6 through pressure signal line 56.
The measuring method of apparatus of the present invention may further comprise the steps.
1) characteristic curve of soil moisture in the pressure limit of measuring as required; Choose the ceramic wafer parts 3 of some pressure ratings; The certain pressure limit of ceramic wafer parts 3 correspondences of each pressure rating is measured the pedotheque 8 on each ceramic wafer parts 3 according to pressure rating order from small to large;
2) the ceramic wafer parts 3 that will obtain continuous some pedotheques of reliable waterpower 8 and certain pressure grade are placed on the electronic balance 2 in the pressure cooker body 11 through some back-up blocks 7; Water delivering orifice on the ceramic wafer 32 33 is connected with pot body rising pipe 42 through flexible steel in flat section tubing 41; Pressure cooker body 11 and pressure container cover 12 is airtight; High-pressure air source 51 is connected in the pressure cooker body 11 through the draft tube 52 that it is provided with electronic control pressure reducing valve 53 and pressure transducer 54;
3) open through the miniature electromagnetic valve 43 on the controller 6 control pot body rising pipes 42, promptly open the water delivering orifice 33 on the ceramic wafer 32 on the ceramic wafer parts 3, this water delivering orifice 33 is communicated with pot body rising pipe 42;
4) in pressure cooker body 11, feed gases at high pressure through controller 6 control high-pressure air source 51 through draft tube 52; Through controller 6 control electronic control pressure reducing valves 53 and pressure transducer 54; Regulate the gases at high pressure that in pressure cooker body 11, feed through draft tube 52, make a set pressure in the pressure limit that reaches corresponding in the pressure cooker body 11 with the ceramic wafer parts of this pressure rating 3;
5) moisture in the pedotheque 8 gets into the space that forms between ceramic wafer 32 and the ceramic wafer caulking gum 31 through ceramic wafer 32 internal voids, and the water delivering orifice on ceramic wafer 32 33, flexible steel in flat section tubing 41, pot body rising pipe 42 and miniature electromagnetic valve 43 flow out then;
6) weight of pedotheque 8 under each set pressure and all experimental provisions on the electronic balance 2 is by placing the electronic balance 2 in the pressure cooker body 11 to measure; Set under the test pressure point at this, after soil suction and the pressure vessel 1 internal pressure balance, do not open pressure cooker body 11, directly the weight of all experimental provisions on measured soil sample 8 and the electronic balance 2 in pressure cooker body 11; Pressure boost is weighed after the balance to next set pressure; Weight difference after twice balance is the displaced weight of pedotheque under corresponding set pressure and the pressure differential; Pressure boost repeats said process to next set pressure once more, and the measurement in the corresponding pressure limit of the ceramic wafer parts of this grade finishes; After the last balance, open pressure vessel 1, the weight in wet base of measured soil sample 8, oven dry pedotheque 8, measured soil sample 8 dry weights are calculated the corresponding soil moisture content of last set pressure; Reach the corresponding water discharge of each set pressure before by the corresponding soil moisture content of last set pressure, calculate the soil moisture content under each set pressure successively, the characteristic curve of soil moisture of accomplishing in this pressure limit is measured;
7) the ceramic wafer parts 3 of the next pressure rating of replacing, repeating step 2) to 6), the characteristic curve of soil moisture in the pressure limit of the ceramic wafer parts of accomplishing this grade after changing 3 correspondences is measured;
8) with characteristic curve of soil moisture arrangement, the combination of each pressure limit, completion needs the interior whole piece characteristic curve of soil moisture of pressure limit of measurement.
In the foregoing description, the ceramic wafer parts 3 of some different pressures grades can be set, measure with the characteristic curve of soil moisture that satisfies in the particular pressure range.For example: need to measure the characteristic curve of soil moisture of 0 to 5bar pressure limit, can adopt the ceramic wafer parts 3 of two kinds of pressure ratings, i.e. the ceramic wafer of the ceramic wafer of 1bar and 5bar.Though only also can accomplish the characteristic curve of soil moisture of 0 to 5bar pressure limit with the ceramic wafer of 5bar; But balance time is just oversize; This is that draining is fast because the ceramic wafer hole of low pressure is big, and it is just fast to reach balance time; Save time, so the ceramic wafer with some different pressure ratings is exactly in order to save time to greatest extent in different pressure limits; The ceramic wafer of 1bar is when pressure during greater than 1bar, and gas also can pass through, and does not have an effect of not exhaust of draining, so the ceramic wafer of 1bar only is applicable to the situation of pressure limit less than 1bar.Therefore, this embodiment measures the characteristic curve of soil moisture of 0 to 5bar pressure limit with the ceramic wafer of 1bar and the ceramic wafer of 5bar, and its concrete measuring process is following.
1) with above-mentioned pedotheque 8 fully saturated after, be placed on the electronic balance 2 that places in the pressure cooker body 11 through some back-up blocks 7 with the ceramic wafer 32 of 1bar; And each ceramic wafer 32 upper water-out mouths 33 usefulness flexible steel in flat section tubing 41 is connected with a pot body rising pipe 42, pressure container cover 12 and pressure cooker body 11 are sealed.
2) open through the miniature electromagnetic valve 43 on the controller 6 control pot body rising pipes 42, promptly open ceramic wafer parts 3 and the pressure cooker body 11 outside pot body rising pipes 42 that are connected.
3) through controller 6 control electronic control pressure reducing valves 53 set pressure in the ceramic wafer 32 corresponding pressure limits that reach in the pressure cooker body 11 with 1bar is set; Moisture outflow pressure pot body 11 in the pedotheque 8; The weight of all appts parts on every separated time interval weighing pedotheque of setting 8 and the electronic balance 2; When double weighing result is identical; Think that the suction and the set pressure of pedotheque 8 obtained balance under this set pressure, write down the counterweight under this set pressure;
Controller repeats above-mentioned weighing process, the counterweight under this set pressure of record through next set pressure in this pressure limit in the control electronic control pressure reducing valve 53 set pressure pot bodies 11; The difference of counterweight is on the ceramic wafer all pedotheques 8 at the pressure of correspondence and the displaced weight under the pressure increment under two set pressures; Repeat said process, until accomplishing the measurement of 1bar with each set pressure point in the internal pressure scope; After the last balance, open pressure vessel, the weight in wet base of measured soil sample 8, oven dry pedotheque 8, measured soil sample 8 dry weights are calculated the corresponding soil moisture content of last set pressure; Reach the corresponding water discharge of each set pressure before by the corresponding soil moisture content of last set pressure, calculate the soil moisture content under each set pressure successively, the characteristic curve of soil moisture of accomplishing in 0 to the 1bar scope is measured;
4) the ceramic wafer part replacement with 1bar is the ceramic wafer parts of 5bar, repeating step 1) to 3), accomplish the characteristic curve of soil moisture in 1～5bar pressure limit;
5) with characteristic curve of soil moisture arrangement, the combination of 0～1bar and 1～5bar, accomplish the characteristic curve of soil moisture in 0 to the 5bar pressure limit.
Above-mentioned each embodiment only is used to explain the present invention, and wherein the structure of each parts, connected mode etc. all can change to some extent, and every equivalents of on the basis of technical scheme of the present invention, carrying out and improvement all should not got rid of outside protection scope of the present invention.
Claims (6)
1. characteristic curve of soil moisture measurement mechanism is characterized in that: it comprises a pressure vessel, an electronic balance, ceramic wafer parts, a cover unwatering system, a cover air inlet system and a controller;
Said pressure vessel comprises pressure cooker body and the pressure container cover that is arranged on its top;
Said electronic balance is arranged in the said pressure cooker body, and said electronic balance is electrically connected said controller;
Said ceramic wafer parts are arranged on the said electronic balance, and said ceramic wafer parts comprise ceramic wafer and the ceramic wafer caulking gum that lower leaf is provided with, and said ceramic wafer is provided with a water delivering orifice; Said ceramic wafer is provided with some pedotheques;
Said unwatering system comprises the rising pipe that connects said the above water delivering orifice of ceramic wafer, and the end that said rising pipe passes said pressure cooker body is provided with a solenoid valve, and said solenoid valve is electrically connected said controller;
Said gas handling system comprises high-pressure air source, and said high-pressure air source connects in the said pressure cooker body through draft tube, is disposed with electronic control pressure reducing valve and pressure transducer on the said draft tube; Said electronic control pressure reducing valve and pressure transducer all are electrically connected said controller;
Said controller is arranged on the outside of said pressure cooker body.
2. a kind of characteristic curve of soil moisture measurement mechanism as claimed in claim 1 is characterized in that: said ceramic wafer parts are arranged on the said electronic balance through some back-up blocks.
3. a kind of characteristic curve of soil moisture measurement mechanism as claimed in claim 1, it is characterized in that: said pedotheque comprises soil and cutting ring, said soil is arranged in the said cutting ring.
4. a kind of characteristic curve of soil moisture measurement mechanism as claimed in claim 2, it is characterized in that: said pedotheque comprises soil and cutting ring, said soil is arranged in the said cutting ring.
5. like claim 1 or 2 or 3 or 4 described a kind of characteristic curve of soil moisture measurement mechanisms; It is characterized in that: the said rising pipe in the said unwatering system comprises the flexible steel in flat section tubing that always connects the said water delivering orifice of said ceramic wafer in succession; Said flexible steel in flat section tubing connects one pot of body rising pipe; Said pot body rising pipe passes said pressure cooker body, and said solenoid valve is arranged on the said pot body rising pipe.
6. measuring method like each said characteristic curve of soil moisture measurement mechanism of claim 1～5, it may further comprise the steps:
1) characteristic curve of soil moisture in the pressure limit of measuring as required; Choose the ceramic wafer parts of some pressure ratings; The pressure limit that the ceramic wafer parts of each pressure rating are corresponding certain is measured the pedotheque on each ceramic wafer parts according to pressure rating order from small to large;
2) the ceramic wafer parts that will obtain continuous some pedotheques of waterpower and certain pressure grade are placed on the electronic balance in the pressure cooker body; It is external that water delivering orifice on the ceramic wafer is connected pressure cooker through rising pipe; Pressure cooker body and pressure container cover is airtight; High-pressure air source is connected in the pressure cooker body through its draft tube that is provided with electronic control pressure reducing valve and pressure transducer;
3) open through the solenoid valve on the controller control rising pipe;
4) in the pressure cooker body, feed gases at high pressure through draft tube through controller control high-pressure air source; Control electronic control pressure reducing valve and pressure transducer simultaneously; Regulate the gases at high pressure that feed in the pressure cooker body, make a set pressure in the pressure limit that reaches corresponding in the pressure cooker body with the ceramic wafer parts of this pressure rating;
5) moisture in the pedotheque gets into the space that forms between ceramic wafer and the ceramic wafer caulking gum through the ceramic wafer internal void, and it is external that the water delivering orifice on ceramic wafer, and rising pipe then flows to pressure cooker;
6) under this set pressure, after soil suction and the vessel internal pressure dynamic balance, do not open the pressure cooker body, directly the weight of all experimental provisions on pressure cooker in-vivo measurement pedotheque and electronic balance; Pressure boost is weighed after the balance to next set pressure; Weight difference after twice balance is the displaced weight of pedotheque under corresponding set pressure and the pressure differential; Pressure boost repeats said process to next set pressure once more, and the measurement in the corresponding pressure limit of the ceramic wafer parts of this grade finishes; After the last balance, open pressure vessel, the weight in wet base of measured soil sample, the oven dry pedotheque, measured soil sample dry weight is calculated the corresponding soil moisture content of last set pressure; Reach the corresponding water discharge of each set pressure before by the corresponding soil moisture content of last set pressure; Calculate the soil moisture content under each set pressure successively, accomplish the corresponding interior characteristic curve of soil moisture of pressure limit of ceramic wafer parts of this grade and measure;
7) the ceramic wafer parts of the next pressure rating of replacing, repeating step 2) to 6), the characteristic curve of soil moisture in the corresponding pressure limit of the ceramic wafer parts of accomplishing this pressure rating after changing is measured;
8) with the arrangement of the characteristic curve of soil moisture in each pressure limit, combination, the whole piece characteristic curve of soil moisture in the pressure limit that completion needs to measure.
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| CN106033043B (en) * | 2015-03-13 | 2018-07-27 | 西北农林科技大学 | A kind of system and measurement method measuring characteristic curve of soil moisture using centrifuge method |
| CN105527190A (en) * | 2016-01-18 | 2016-04-27 | 江苏圣泰环境科技股份有限公司 | Device and method for determining soil water characteristic curve under constant pressure |
| CN105651968A (en) * | 2016-03-04 | 2016-06-08 | 江苏大学 | Method using water potential instrument to online detect soil water content |
| CN107328685A (en) * | 2017-06-26 | 2017-11-07 | 武汉大学 | Go out the method that stream method determines unsaturated soil Hydrodynamic Parameters with pressure plare/pressure membrane |
| CN108287121A (en) * | 2017-12-12 | 2018-07-17 | 中国水利水电科学研究院 | Measure the device and method of the water characteristic curve of soil dehumidification and moisture absorption process |
| CN108287121B (en) * | 2017-12-12 | 2020-02-21 | 中国水利水电科学研究院 | Device and method for measuring moisture characteristic curve of soil in dehumidification and moisture absorption processes |
| CN108243921A (en) * | 2018-01-28 | 2018-07-06 | 周芳 | A kind of method for instructing cotton irrigation volume early warning |
| CN111650082A (en) * | 2020-07-22 | 2020-09-11 | 深圳大学 | Unsaturated soil-water characteristic curve measuring device and measuring method |
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