CN111442990A - Piston cylinder device and real-time pressure measuring method thereof - Google Patents
Piston cylinder device and real-time pressure measuring method thereof Download PDFInfo
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- 238000009931 pascalization Methods 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/002—Component parts of these vessels not mentioned in B01J3/004, B01J3/006, B01J3/02 - B01J3/08; Measures taken in conjunction with the process to be carried out, e.g. safety measures
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/06—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2203/0226—High temperature; Heating means
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/0232—High pressure
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention provides a piston cylinder device, which comprises a base assembly, a piston and a cylinder assembly, wherein a camera device is fixedly arranged on the base assembly, the camera device is connected with a processor, the piston is arranged in the cylinder assembly and moves relative to the cylinder assembly in the axial direction, speckle marks are sprayed on the outer surface of the piston and/or the cylinder assembly, the camera device collects images of the speckle marks in real time and sends the images to the processor, the real-time pressure measurement method of the piston cylinder device comprises the steps that the speckle marks are sprayed on the outer surface of the piston and/or the cylinder assembly to carry out a high-temperature high-pressure experiment, the camera device is used for collecting the images of the speckle marks in real time in the experiment process, the processor calculates the strain of the piston and the cylinder assembly according to the images, the hydrostatic pressure borne by a sample is calculated through the strain, and the real-time high-precision detection of the experimental pressure of the piston cylinder high-temperature, thereby promoting the experimental precision of the existing device.
Description
Technical Field
The invention relates to the field of high-temperature and high-pressure experimental devices, in particular to a piston cylinder device and a real-time pressure measuring method thereof.
Background
Piston-cylinder devices are a common experimental device in the fields of physics, chemistry, geoscience, and the like. The device comprises cylindric cavity and piston, acts on the piston with hundreds of tons of pressure through the press, and then acts on the sample, realizes the inside super high hydrostatic pressure of sample, and the highest can reach 5 ~ 6GPa, and the simulation high temperature environment in the drum cavity simultaneously for the sample is in high temperature high pressure state simultaneously.
In the existing experimental apparatus, the measurement of the hydrostatic pressure applied to the sample is generally performed by a theoretical calculation method. That is, the pressure output by the press is considered to be totally applied to the experimental sample, and the hydrostatic pressure P is equal to the press output force F/piston cross-sectional area S. Under the measurement method, the pressure error in the experimental process is 0.03 GPa. The main sources of error are friction between the moving parts of the press, and friction between the test specimen and the piston and cylinder. The method has the advantages that the measurement is convenient, and the pressure borne by the sample can be calculated by outputting the oil pressure through the hydraulic machine; the defect is that the experimental error is slightly large, and especially when the material proportion of the sample bin is changed, uncertain pressure loss is generated due to slight change of the friction condition, and the experimental error is increased.
Therefore, it is necessary to invent a piston cylinder device with a simple structure, which can realize high-precision monitoring of the real-time pressure of the sample in the piston cylinder.
Disclosure of Invention
In view of this, the present invention is directed to a piston cylinder device and a real-time pressure measuring method thereof, so as to achieve real-time high-precision detection of the experimental pressure of the piston cylinder device.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the utility model provides a piston drum device, includes base subassembly, piston and drum subassembly, the last fixed camera device that is provided with of base subassembly, camera device is connected with the treater, the piston sets up in the drum subassembly, and with drum subassembly axial relative motion, piston and/or drum subassembly surface spraying have the speckle mark, camera device gathers in real time the image of speckle mark is sent to on the treater.
Further, the base assembly comprises an upper base, a lower base and a supporting rod, the supporting rod is connected with the upper base and the lower base, and the camera device is fixedly arranged on the upper base, and/or on the lower base, and/or on the supporting rod. The position of the camera device is set according to the requirement of collection, and speckle marks can be conveniently collected.
Further, the cylinder component comprises an inner cylinder and an outer cylinder, the outer cylinder is coated outside the inner cylinder, a piston capable of moving along the axial direction is arranged inside the inner cylinder, and the speckle marks are sprayed on the upper surface of the inner cylinder. Because the inner barrel generates radial deformation under the action of pressure, the speckle marks sprayed on the upper surface can reflect the radial deformation.
Further, the speckle mark is sprayed on the outer surface of the piston, which can be in axial movable contact with the inner cylinder. The piston can be deformed in the axial direction by spraying the speckle marks on the outer surface.
Further, the speckle marks are formed by black or white spray painting.
Furthermore, more than one image pickup device is arranged. Set up a camera device and can satisfy the collection needs, set up a plurality ofly and can guarantee to gather the precision and improve the speed of gathering.
A real-time pressure measuring method of a piston cylinder device adopts the piston cylinder device and comprises the following steps:
step 1: arranging a sample in a cavity of which the inner cylinder is internally provided with a piston;
step 2: spraying the speckle marks on the outer surface of the piston and the upper surface of the outer cylinder;
and step 3: starting a high-temperature and high-pressure experiment, and starting the camera device to collect the speckle mark images before and after pressure loading in real time in the experiment process;
and 4, step 4: inputting the collected speckle mark image into a processor;
and 5: a processor calculates the hydrostatic pressure to which the sample is subjected from the transformation of the speckle marker image.
Further, the specific method for calculating the hydrostatic pressure to which the sample is subjected by the processor according to the transformation of the speckle mark image in the step 5 is as follows:
step 51: calculating the axial strain quantity of the piston and the radial strain quantity of the inner cylinder by a computer according to the change of the speckle images;
step 52: calculating the hydrostatic pressure of the sample by combining the axial strain of the piston with the shape and material properties of the piston, and recording the value as sigma1；
Step 53: calculating the hydrostatic pressure of the sample by combining the radial strain of the inner cylinder with the shape and material properties of the inner cylinder, and recording the value as sigma2；
Step 54: calculating sigma1And σ2When deviation of (a)1And σ2When the deviation is not more than 2%, the mean value sigma of the two is taken as (sigma)1+σ2) Step 55 is entered,/2; when sigma is1And σ2If the deviation exceeds 2%, the step 56 is carried out;
step 55: calculating the deviation of sigma from the theoretical hydrostatic pressure P, wherein the deviation of sigma from P is not more than 5 percent, and sigma is equal to (sigma)1+σ2) The final result is/2, the deviation between σ and P exceeds 5%, go to step 56;
step 56: the source of error of the piston cylinder arrangement is investigated.
Further, the method for rejecting the error source in step 56 is as follows:
checking whether the camera device and the line connection thereof have faults, whether the inner cylinder has defects, whether the outer cylinder has defects, and whether the piston cylinder device generates vibration;
the technical scheme of the invention has the following advantages:
(1) the piston cylinder device is provided with the camera device and is connected with the processor, so that a redundant and complex pressure sensing system is eliminated, the structure is simple, and the operation is convenient;
(2) the piston cylinder device can accurately measure the ultrahigh hydrostatic pressure in the containing cavity for placing the sample in real time, can be applied to the conditions of high temperature and high pressure, and has important significance for improving the experimental precision of the piston cylinder device; the device can be applied to other experimental devices which need to measure ultrahigh experimental pressure.
(3) According to the real-time pressure measuring method of the piston cylinder device, the pressure in the containing cavity for placing the sample is measured by adopting the digital image correlation technology, only the speckle images are collected by the camera device and the pressure is calculated and checked by the processor, the processing speed is high, the error is small, and high-precision measurement is realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a piston cylinder apparatus according to one embodiment of the present invention;
FIG. 2 is an enlarged view of the invention at B in FIG. 1;
FIG. 3 is a schematic bottom view of section A-A of FIG. 1 in accordance with the present invention;
FIG. 4 is a schematic view of a second embodiment of the cross-sectional bottom view of the invention.
Description of reference numerals:
1. an upper base; 2. a base plate; 3. a support block; 4. a piston; 5. a sample; 6. a support plug; 7. a lower base; 8. a camera device; 9. a strut; 10. a speckle dispersing area; 11. an outer cylinder; 12. an inner barrel; 120. an accommodating chamber; 13. a fixing plate; 14. a pressure support plate; 15. a pressure distribution plate; 16. a master cylinder; 17. a slider; 18. an unloading hydraulic cylinder; 19. a support frame.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The descriptions of "left", "right", "upper", "lower", etc. in this disclosure are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit indication of the number of technical features indicated and have been identified in the drawings. Thus, a feature defined as "left", "right", "upper", "lower" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it is necessary that a person skilled in the art can realize the combination, and the technical solutions in the embodiments are within the protection scope of the present invention.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
First embodiment, as shown in fig. 1 and 2, a piston cylinder device includes: the device comprises a base assembly, a piston 4 and a cylinder assembly, wherein the base assembly is used for supporting the piston 4 and the cylinder assembly, the base assembly comprises an upper base 1, a lower base 7 and support rods 9, more than two support rods 9 are arranged and used for fixedly connecting the upper base 1 and the lower base 7, a camera device 8 is fixedly arranged on the base assembly, the camera device 8 is fixedly arranged on the upper base 1 and/or the lower base 7 and/or the support rods 9, the camera device 8 is connected with a processor, in the embodiment, one camera device 8 is arranged and fixedly arranged on one side of the upper base 1 opposite to the lower base 7, a backing plate 2 is fixedly arranged on one side of the upper base 1 opposite to the lower base 7 through bolts, a supporting block 3 is fixedly connected on the backing plate 2 through bolts and can be contacted with the upper part of the piston 4, and has the functions of buffering and supporting protection for the piston 4, the piston 4 is arranged in the cylinder component and moves axially relative to the cylinder component; the cylinder component comprises an inner cylinder 12 and an outer cylinder 11, the lower parts of the inner cylinder 12 and the outer cylinder 11 are fixed together through a fixing plate 13 by bolts, the outer cylinder 11 is sleeved outside the inner cylinder 12 to play a role of protecting the inner cylinder 12 and playing a role of heat insulation, heat preservation and pressure maintaining, a containing cavity 120 is arranged inside the inner cylinder 12, a piston 4 which does reciprocating motion is arranged at the upper part in the containing cavity 120, the middle part of the containing cavity 120 is used for placing a sample 5, a supporting plug 6 is arranged at the lower part of the containing cavity 120, the upper end of the supporting plug 6 is plugged into the containing cavity 120, the lower end is connected with the left end of a sliding block 17 through a pressure supporting plate 14, the right end of the sliding block 17 is sleeved on a supporting frame 19 and slides up and down along the supporting frame 19, the pressure supporting plate 14 is connected with a main hydraulic cylinder 16 through a pressure distributing, the main hydraulic cylinder 16 continues to apply pressure, the supporting plug 6 provides upward pressure for the sample 5, the piston 4 deforms under the abutting action of the supporting block 3 to provide downward pressure for the sample 5, so that the sample 5 is subjected to a high-pressure experiment under the action of the piston 4, the supporting frame 19 is connected to the supporting rod 9, the unloading hydraulic cylinder 18 is arranged on the lower portion of the supporting frame 19, and the sample 5 can be smoothly taken out of the inner cylinder 12 under the action of the unloading hydraulic cylinder 18.
Further, the speckle mark is sprayed on the upper surface of the outer cylinder 11, the speckle mark is sprayed on the outer surface of the piston 4 which can be in sliding contact with the inner cylinder 12, the speckle mark is a pattern formed by black or white paint spraying, and the image of the speckle mark is collected by the camera device 8 in real time and is sent to the processor.
Further, camera device 8 can 360 degrees rotations to by the angle of processor regulation camera device 8, so that gather speckle mark image, camera device 8 is inside to be provided with image acquisition card, can save the image of gathering and transmit for the processor with the digital signal mode, camera device 8 is connected to the processor through wired or wireless mode with transmission speckle mark image, and camera device 8 is fixed on upper base 1 through bolt fastening or bonding.
In this embodiment, the blackened portions of the surfaces of the piston 4 and the inner cylinder 12 are speckle dispersing areas 10, the speckle dispersing areas 10 are arranged on the left side opposite to the support frame 19, the arrangement direction of the camera device 8 is consistent with that of the speckle dispersing areas 10, the arrangement avoids interference with the support frame 19, and the image acquisition is prevented from being affected, as shown in fig. 3, three support rods 9 are provided, because the upper base 1 and the lower base 7 are cylindrical, the support rods 9 are uniformly arranged along the upper base 1, the center of the support rod 9 fixed with the support frame 19 is a point C, and the center of the upper base 1 is a point D, preferably, one camera device 8 is provided, and is arranged on an extension line on the left side of the connection line of the point C and the point D, the arrangement avoids interference with the support frame 19, and can ensure that the surface areas of the piston 4 and the inner cylinder 12, which can be acquired by the camera device 8, are as large, the fixed position of the camera device 8 can be changed according to the position of the speckle region 10 so as to mainly collect, and in other embodiments, the camera device 8 can also be arranged on the lower base 7 or the support rod 9.
In the second embodiment, as shown in fig. 4, three supporting rods 9 are provided, because the upper base 1 and the lower base 7 are cylindrical, the supporting rods 9 are uniformly distributed along the upper base 1, the center of the supporting rod 9 fixed with the supporting frame 19 is a point C, and the center of the upper base 1 is a point D, preferably, two camera devices 8 are provided, and are arranged on two sides of an extension line on the left side of the connection line of the point C and the point D, the arrangement avoids interference with the supporting frame 19, and can ensure that the surface areas of the piston 4 and the inner cylinder 12 which can be collected by the camera device 8 are as large as possible, so that speckle marks can be collected, it is worth explaining that the fixing position of the camera device 8 can be changed according to the position of the speckle region 10 so as to collect the main speckle marks, in other embodiments, the camera device 8 can also be arranged on the lower base 7 or the supporting rod 9, and the arrangement, and the acquisition precision is improved, and other settings are the same as those of the first embodiment.
A real-time pressure measuring method of a piston 4-cylinder device adopts the piston 4-cylinder device and comprises the following steps:
step 1: arranging a sample 5 in a cavity of the inner cylinder 12, wherein the piston 4 is arranged in the cavity;
step 2: spraying the speckle marks on the outer surface of the piston 4 and the upper surface of the outer cylinder 11;
and step 3: starting a high-temperature and high-pressure experiment, and starting the camera device 8 to collect the speckle mark images before and after pressure loading in real time in the experiment process;
and 4, step 4: inputting the collected speckle mark image into a processor;
and 5: a processor calculates the hydrostatic pressure to which the sample 5 is subjected from the transformation of the speckle marker image. Further, the specific method for calculating the hydrostatic pressure to which the sample 5 is subjected by the processor according to the transformation of the speckle mark image in the step 5 is as follows:
step 51: calculating the axial strain of the piston 4 and the radial strain of the inner barrel 12 by a processor according to the change of the speckle mark point image;
step 52: the axial strain of the piston 4 is combined with the shape and material properties of the piston 4 to calculate the hydrostatic pressure applied to the sample 5, and the value is recorded as sigma1；
Step 53: the radial strain of the inner tube 12 is combined with the shape and material properties of the inner tube 12 to calculate the hydrostatic pressure to which the sample 5 is subjected, and the value is recorded as sigma2；
Step 54: calculating sigma1And σ2When deviation of (a)1And σ2When the deviation is not more than 2%, the mean value sigma of the two is taken as (sigma)1+σ2) Step 55 is entered,/2; when sigma is1And σ2If the deviation exceeds 2%, the step 56 is carried out;
the deviation calculation method is to calculate sigma1And σ2The absolute value of the difference is calculated1Or σ2Percentage of the ratio, where σ is taken1And σ2Absolute value of difference and sigma2The percentage of the ratio is σ1And σ2The deviation of (2).
Step 55: calculating the deviation of sigma from the theoretical hydrostatic pressure P, wherein the deviation of sigma from P is not more than 5 percent, and sigma is equal to (sigma)1+σ2) The final result is/2, the deviation between σ and P exceeds 5%, go to step 56;
the deviation calculation method of sigma and theoretical hydrostatic pressure P is to calculate the absolute value of the difference between sigma and P and then calculate the percentage of the absolute value to the ratio of P.
Step 56: the source of error of the piston cylinder arrangement is investigated.
Further, the method for checking the error source in step 56 is as follows:
checking whether the camera device 8 and the line connection thereof have faults, whether the inner cylinder 12 has defects, whether the outer cylinder 11 has defects, and whether the piston cylinder device generates vibration;
in the third embodiment, the piston 4 and cylinder device has the following structural dimensions: the diameter of the piston 4 contacting the receiving cavity 120 of the inner cylinder 12 is 20mm, and the output pressure of the hydraulic cylinder 16 is 100 tons at most.
When the hydraulic cylinder 16 outputs 32 tons of pressure, theoretical hydrostatic pressure value calculation is carried out, namely, the pressure output by the hydraulic cylinder 16 is considered to be all acted on the sample 5, and P is calculated according to a formula, wherein F/S is 32 tons/(pi 10 mm) mm2999MPa, where P is the hydrostatic pressure, F is the output force of the hydraulic cylinder 16, and S is the cross-sectional area of the portion of the piston 4 inserted into the inner cylinder 12, with an error of 30MPa, measured by Depthsof the Earth company, which is 30/999 x 100% to 3%.
The strain of the piston 4 is measured by using a digital image technology, and the measurement precision can reach 10 mu. When hydraulic cylinder 16 outputs 32 tons of pressure, it is measured that compressive strain is generated in the axial direction of piston 410.00167, according to the stress calculation formula σ1＝E*1Where σ is1According to compressive strain for sample 51The applied compressive stress, i.e. hydrostatic pressure, E is the elastic modulus of the piston 4, the piston 4 is made of tungsten carbide, and the elastic modulus E is 600 GPa. Calculated to sigma1600GPa 0.00167 1002 MPa. The calculation error is 600GPa 10 μ 6MPa, and the ratio is 6/1002 100% 0.6%.
Similarly, the compressive strain radially generated in the inner barrel 12 is measured2＝0.00167。σ2＝E*2Where σ is2According to compressive strain for sample 52The applied compressive stress, i.e. hydrostatic pressure, E is the elastic modulus of the piston 4, the piston 4 is made of tungsten carbide, and the elastic modulus E is 600 GPa. Calculated to sigma2＝600GPa*0.00167＝1002MPa。
In this embodiment σ1＝σ2Then σ ═ σ1＝σ2Calculating the deviation of sigma from the theoretical hydrostatic pressure P, wherein 100 percent of the deviation value is less than 5 percent, and the deviation value is less than 0.3 percent, so the sample 5 is obtainedThe final result of the hydrostatic pressure is 1002 MPa.
The stress value measured by the strain of the inner cylinder 12 is theoretically the same as that calculated by the strain of the piston 4, but in actual operation, the difference between the two values caused by measurement deviation is inevitable. When the deviation of the pressure value calculated by the piston 4 and the inner cylinder 12 is not more than 2%, taking the average value of the two as a final result, and performing deviation calculation with a theoretical result calculated by the formula of P ═ F/S, wherein the deviation is not more than 5%, and more than 5% of error sources are searched, and when the deviation of the pressure value calculated by the piston 4 and the inner cylinder 12 is more than 2%, the error sources are searched.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (9)
1. The utility model provides a piston drum device, includes base subassembly, piston and drum subassembly, its characterized in that, the last fixed camera device that is provided with of base subassembly, camera device is connected with the treater, the piston sets up in the drum subassembly, and with drum subassembly axial relative motion, piston and/or drum subassembly surface spraying have the speckle mark, camera device gathers in real time the image of speckle mark is sent to on the treater.
2. The piston cylinder device according to claim 1, characterized in that said base assembly comprises an upper base, a lower base and a support rod, said support rod connecting the upper base and the lower base, said camera means being fixedly arranged on the upper base, and/or on the lower base, and/or on the support rod.
3. The piston cylinder device as claimed in claim 2, wherein the cylinder assembly comprises an inner cylinder and an outer cylinder, the outer cylinder is sleeved outside the inner cylinder, a piston capable of moving along the axial direction is arranged inside the inner cylinder, and the speckle mark is sprayed on the upper surface of the inner cylinder.
4. The piston cylinder assembly as described in claim 3 wherein said speckle indicia is sprayed on an outer surface of said piston in relatively movable contact with said inner cylinder.
5. The piston cylinder apparatus as claimed in claim 4, wherein said speckle markings are patterns formed by black or white paint spray.
6. The piston cylinder apparatus as claimed in claim 5, wherein said camera means is provided in more than one.
7. A real-time pressure measuring method of a piston cylinder device, which adopts the piston cylinder device as claimed in any one of claims 1 to 6, and comprises the following steps:
step 1: arranging a sample in a cavity of which the inner cylinder is internally provided with a piston;
step 2: spraying the speckle marks on the outer surface of the piston and the upper surface of the inner barrel;
and step 3: starting a high-temperature and high-pressure experiment, and starting the camera device to collect the speckle mark images before and after pressure loading in real time in the experiment process;
and 4, step 4: inputting the collected speckle mark image into a processor;
and 5: a processor calculates the hydrostatic pressure to which the sample is subjected from the transformation of the speckle marker image.
8. The method for measuring the pressure of the piston cylinder device in real time according to claim 7, wherein the specific method for calculating the hydrostatic pressure to which the sample is subjected by the processor according to the speckle mark image in the step 5 is as follows:
step 51: calculating the axial strain quantity of the piston and the radial strain quantity of the inner cylinder by a computer according to the change of the speckle images;
step 52: calculating the hydrostatic pressure of the sample by combining the axial strain of the piston with the shape and material properties of the piston, and recording the value as sigma1；
Step 53: calculating the hydrostatic pressure of the sample by combining the radial strain of the inner cylinder with the shape and material properties of the inner cylinder, and recording the value as sigma2；
Step 54: calculating sigma1And σ2When deviation of (a)1And σ2When the deviation is not more than 2%, the mean value sigma of the two is taken as (sigma)1+σ2) Step 55 is entered,/2; when sigma is1And σ2If the deviation exceeds 2%, the step 56 is carried out;
step 55: calculating the deviation of sigma from the theoretical hydrostatic pressure P, wherein the deviation of sigma from P is not more than 5 percent, and sigma is equal to (sigma)1+σ2) The final result is/2, the deviation between σ and P exceeds 5%, go to step 56;
step 56: the source of error of the piston cylinder arrangement is investigated.
9. The method for real-time pressure measurement of a piston-cylinder unit according to claim 8, wherein the error sources in step 56 are checked by:
and checking whether the camera device and the line connection thereof have faults, whether the inner cylinder has defects, whether the outer cylinder has defects and whether the piston cylinder device generates vibration.
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