CN111272834B - Nested capacitance tomography sensor and image data acquisition method - Google Patents
Nested capacitance tomography sensor and image data acquisition method Download PDFInfo
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- CN111272834B CN111272834B CN202010136656.1A CN202010136656A CN111272834B CN 111272834 B CN111272834 B CN 111272834B CN 202010136656 A CN202010136656 A CN 202010136656A CN 111272834 B CN111272834 B CN 111272834B
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Abstract
The invention relates to a nested capacitance tomography sensor and an image data acquisition method based on the nested capacitance tomography sensor, wherein the sensor comprises a shielding cover, a radial shielding electrode, an outer tube wall, an outer electrode group tightly attached to the outer side of the outer tube wall, an inner electrode group tightly attached to the outer side of the inner tube wall and an electrode probe; and an inner electrode group and an electrode probe are adopted to move to the inside of the outer tube wall along the axis by taking the center of the tube as the axis, and capacitance values between the electrode pairs are respectively collected from the edge of the field area to be measured and the inside of the field area to be measured. The inner electrode group and the outer electrode group are distributed in a multi-layer mode at equal intervals from top to bottom, and capacitance values of multiple heights can be measured simultaneously. Compared with the prior art, the invention has the advantages that: the capacitance value can be acquired from the inside of the measured field, the data volume of the capacitance value of image reconstruction is increased, and the quality and the resolution of the image reconstruction are improved.
Description
Technical Field
The invention relates to the technical field of process imaging, in particular to a nested capacitance tomography sensor and an image data acquisition method based on the nested capacitance tomography sensor.
Background
An Electrical Capacitance Tomography (ECT) system acquires a series of Capacitance measurement values by relying on array electrodes arranged at the boundary of a measured field, and performs image reconstruction by using the relationship between the Capacitance measurement values and the medium distribution in the measured field to obtain a medium distribution image in the measured field. The capacitance tomography system can reflect the change of the dielectric constant of the substance in the detected area. Based on this principle, ECT systems are often used to measure multiphase material distributions having two or more dielectric constants.
The sensor is the source of ECT system information, and the traditional ECT sensor only has one group of fixed electrodes which are tightly attached to the measured pipeline, the position is not movable, and the measured space is fixed. During image reconstruction, only N (N-1)/2 capacitance values measured by N electrodes tightly attached to a measured pipeline are used for image reconstruction. The capacitance value quantity acquired by the traditional ECT sensor is limited, the resolution of the obtained reconstructed image is low, and the phase distribution condition of the measured medium cannot be accurately reflected.
Existing non-conventional capacitance tomography sensors are each emphasized. The existing double-layer ECT sensor can only collect capacitance values from the section of a measured object along the edge of a pipeline, the number of the capacitance values for image reconstruction is small, the error of the reconstructed image is large, and more capacitance values cannot be obtained from the inside of the section of the measured object. Therefore, designing a sensor capable of acquiring more effective capacitance value data, especially acquiring more effective capacitance value data from the inside of the cross section of the measured substance, is a technical problem to be solved in the future regarding the further development, popularization and application of the ECT technology.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a nested capacitance tomography sensor and an image data acquisition method based on the nested capacitance tomography sensor, aiming at the above-mentioned defects of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a nested capacitance tomography sensor comprising: the device comprises a shielding cover, a radial shielding electrode, an outer pipe wall, an outer electrode group tightly attached to the outer side of the outer pipe wall, an inner electrode group tightly attached to the outer side of the inner pipe wall and an electrode probe; the shielding cover is connected with the outer pipe wall through a plurality of radial shielding electrodes arranged at equal intervals, the outer electrode group is attached to the outer side of the outer pipe wall at equal intervals, and the inner electrode group is attached to the outer side of the inner pipe wall at equal intervals; the electrode probe is arranged at the central position of the inner side of the inner tube wall.
The electrode probe is a metal cylinder with adjustable diameter, and the shielding cover, the radial shielding electrode, the inner electrode group, the outer electrode group and the electrode probe are all made of metal materials with good conductivity.
Wherein, the inner pipe wall and the outer pipe wall are made of organic glass or non-conductive materials.
The technical problem to be solved by the present invention is to provide an image data acquisition method based on a capacitance tomography sensor, aiming at the above defects in the prior art, and performing more accurate image inversion on different medium distribution conditions inside the sensor by using the nested capacitance tomography sensor according to the above technical solution, including the steps of:
two-phase or multi-phase substances are distributed in the outer tube wall, and the shielding cover and the radial shielding electrode are fixed on the outer side of the outer tube wall to form a whole
Adjusting the relative positions of the inner tube wall, the electrode probes and the outer tube wall to enable the inner electrode group and the electrode probes to be positioned above the top of the outer electrode group, and measuring the capacitance value between each inner electrode pair of each layer of the outer electrode group;
moving the inner tube wall, moving the inner electrode group to the inner side of the outer tube wall along the axial direction of the inner tube wall, wherein the inner electrode group and the outer electrode group are coaxial and aligned along the top end, and measuring the capacitance value between each inner electrode pair of each layer of the inner electrode group;
collecting capacitance values between each inner electrode in the inner electrode group and the appointed outer electrode at the same level in the outer electrode group; the appointed outer electrodes at the same level in the outer electrode group comprise outer electrodes opposite to the inner electrodes and a left outer electrode and a right outer electrode which are adjacent to the opposite outer electrodes;
and the electrode probe moves to the inside of the inner tube wall, and capacitance values between each inner layer electrode in the inner layer electrode group and the electrode probe are acquired.
When the capacitance value between the two electrodes is measured, one electrode is used as an exciting electrode, the other electrode is used as a measuring electrode, and the rest electrodes are grounded.
When the capacitance value between the electrodes is collected, a capacitance measuring device is adopted for collecting; the capacitance measuring device comprises an excitation signal end, a capacitance measuring end, a grounding end and a gating circuit; each electrode in the inner electrode group and the outer electrode group is connected with a gating circuit, and each gating circuit is connected with an excitation signal end, a capacitance value measuring end and a grounding end of the capacitance measuring device; when the capacitance value between the electrodes is measured, the gating circuit connected with the electrodes as the exciting electrodes is conducted with the lead of the exciting signal end of the capacitance measuring device, and is cut off with the lead of the capacitance measuring end of the capacitance measuring device, and the gating circuit connected with the electrodes as the measuring electrodes is cut off with the lead of the exciting signal end of the capacitance measuring device, and is conducted with the lead of the capacitance measuring end of the capacitance measuring device.
Different from the prior art, the nested capacitive tomography sensor comprises a shielding cover, a radial shielding electrode, an outer tube wall, an outer electrode group tightly attached to the outer side of the outer tube wall, an inner electrode group tightly attached to the outer side of the inner tube wall and an electrode probe; and an inner electrode group and an electrode probe are adopted to move to the inside of the outer tube wall along the axis by taking the center of the tube as the axis, and capacitance values between the electrode pairs are respectively collected from the edge of the field area to be measured and the inside of the field area to be measured. The inner electrode group and the outer electrode group are distributed in a multi-layer mode at equal intervals from top to bottom, and capacitance values of multiple heights can be measured simultaneously. Compared with the prior art, the invention has the advantages that: the capacitance value can be acquired from the interior of the measured field, the data volume of the capacitance value of image reconstruction is increased, and the quality and the resolution of the image reconstruction are improved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of a nested capacitance tomography sensor provided by the invention.
Fig. 2 is a schematic flowchart of an image data acquisition method based on a capacitance tomography sensor according to the present invention.
Fig. 3 is a schematic structural diagram of an axial expansion device in an image data acquisition method based on a capacitance tomography sensor provided by the invention.
Fig. 4 is a schematic structural diagram of a capacitance measuring device in an image data acquisition method based on a capacitance tomography sensor according to the present invention.
Fig. 5 is an expanded schematic diagram of an inner electrode set and an outer electrode set in an image data acquisition method based on a capacitance tomography sensor according to the present invention.
FIG. 6 is a schematic diagram of measuring the selection of electrodes in the inner electrode set and the outer electrode set by the image data acquisition method based on the electrical capacitance tomography sensor.
Fig. 7 is a schematic diagram illustrating measurement of inter-electrode capacitance values of an inner electrode group and an electrode probe in an image data acquisition method based on a capacitance tomography sensor according to the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, a nested capacitance tomography sensor of the present invention includes: the device comprises a shielding cover 1, a radial shielding electrode 2, an outer tube wall 3, an outer electrode group 4 closely attached to the outer side of the outer tube wall 3, an inner tube wall 5, an inner electrode group 6 closely attached to the outer side of the inner tube wall and an electrode probe 7; the shielding cover 1 is connected with the outer tube wall 3 through a plurality of radial shielding electrodes 2 arranged at equal intervals, the outer electrode group 4 is attached to the outer side of the outer tube wall 3 at equal intervals, and the inner electrode group 6 is attached to the outer side of the inner tube wall 5 at equal intervals; the electrode probe 7 is arranged at the central position of the inner side of the inner tube wall 5.
The electrode probe 7 is a metal cylinder with adjustable diameter, and the shielding cover 1, the radial shielding electrode 2, the inner electrode group 4, the outer electrode group 6 and the electrode probe 7 are all made of metal materials with good conductivity.
Wherein, the inner pipe wall 3 and the outer pipe wall 5 are made of organic glass or non-conductive materials.
The technical scheme adopted by the invention is to provide the axially telescopic nested type capacitance tomography sensor, and the number of capacitance values required by capacitance tomography is increased from the inside of the cross section of a measured substance, so that the resolution of image reconstruction is improved. By means of the arrangement, the outer pipe wall 3, the inner pipe wall 5 and the electrode probe 7 are concentrically arranged, and the inner pipe wall 5 and the electrode probe 7 are axially moved simultaneously or respectively by using the central axis of the outer pipe wall 3 as an axis under the control of a motor (not shown). The shield 1 is arranged to avoid external electromagnetic interference and the radial shield electrode 2 is arranged to avoid electromagnetic interference between adjacent electrodes.
In addition, as shown in fig. 2, the present invention provides an image data acquisition method based on a capacitance tomography sensor, which uses the nested capacitance tomography sensor according to the foregoing technical solution to perform image inversion on different medium distribution conditions inside a container, and includes the steps of:
s110: two-phase or multi-phase substances are distributed in the outer tube wall, and the shielding cover and the radial shielding electrode are fixed on the outer side of the outer tube wall to form a whole.
The shield cover 1, the radial shield electrode 2 and the outer tube wall 3 are fixed and placed by arranging a support as a whole, for a tubular container, the tube body of the tubular container can be used as the outer tube wall 3 of the sensor, the shield cover 1 and the radial shield electrode 2 for connection are arranged on the outer side of the tube body of the tubular container as the outer tube wall 3 and the inner side of the shield cover 1. The shielding case 1 is used for shielding electromagnetic interference outside the sensor, and the radial shielding electrode 2 is used for shielding electromagnetic interference between adjacent electrodes.
S120: and adjusting the relative positions of the inner tube wall, the electrode probes and the outer tube wall to enable the inner electrode group and the electrode probes to be positioned above the top of the outer electrode group, and measuring the capacitance value between each inner electrode pair of each layer of the outer electrode group.
The inner tube wall and the electrode probe can be moved relative to the outer tube wall by controlling the movement of the inner tube wall and the electrode probe respectively by a stepping motor (not shown). In the invention, taking the inversion of the medium distribution image in the barrel as an example, an axial expansion device shown in fig. 3 is arranged to control the movement of the inner pipe wall and the electrode probe relative to the outer pipe wall. In fig. 3, the telescopic device comprises a screw rod 8, a connecting slide block 9, a connecting rod 10, a bracket 11 and a base 12. The whole body formed by the shielding cover 1, the radial shielding electrode 2 and the outer tube wall 3 is arranged on the base 12, the support 11 is vertical to the base 12 and comprises a beam 18, and the beam 18 is arranged in parallel with the plane of the base 12. The cross beam 18 is provided with three threaded holes, and the extending direction of the threaded holes faces the base direction and penetrates through the cross beam 18. Correspond in the three screw hole and set up three hob 8, 8 surfaces of hob set up the screw thread, carry out screw-thread fit with the screw thread of screw hole inner wall. The three threaded holes are arranged in a row on the beam 18, the lower ends of the screw rods 8 inserted into the middle threaded hole are connected with the motor probe 7, the lower ends of the screw rods 8 inserted into the threaded holes on the two sides are connected with the two ends of the connecting slide block 9, the connecting slide block 9 is connected with the inner pipe wall 5 at the same time, and the connecting slide block 9 is arranged to prevent the threaded rods 8 from driving the inner pipe wall 5 and the electrode probe 7 to rotate along with the rotation when the threaded rods 8 rotate in the threaded holes. Three threaded rods 8 in the beam are controlled by a motor to move up and down along with the threads, so that the inner pipe wall 5 and the electrode probe 7 are controlled to move along the axial direction.
In this step, the inner tube wall 5 and the electrode probes 7 are moved under the control of the motor, so that the inner electrode group 6 and the electrode probes 7 are located above the top of the outer electrode group 4, and the capacitance between each inner electrode pair of the outer electrode group 4 is measured.
Wherein, when collecting the capacitance value between the electrodes, the capacitance measuring device 13 is adopted for collection; the capacitance measuring device 13 includes an excitation signal terminal 14, a capacitance measuring terminal 15, a ground terminal 16, and a gating circuit 17, as shown in fig. 4. Each electrode in the inner electrode group 6 and the outer electrode group 4 is connected with a gating circuit 17, and each gating circuit 17 is connected with an excitation signal end 14, a capacitance value measuring end 15 and a grounding end 16 of the capacitance measuring device 13; when the capacitance value between the electrodes is measured, one of the electrodes is used as an exciting electrode and the other electrode is used as a measuring electrode. The gate circuit 17 connected to the electrode as the excitation electrode is connected to the lead of the excitation signal terminal 14 of the capacitance measuring device 13, the lead of the capacitance measuring terminal 15 of the capacitance measuring device 13 is cut off, the gate circuit 14 connected to the electrode as the measuring electrode is cut off from the lead of the excitation signal terminal 14 of the capacitance measuring device 13, and the lead of the capacitance measuring terminal 15 of the capacitance measuring device 13 is connected.
Specifically, the number of electrodes distributed at equal intervals in each layer of the outer electrode group 4 and the inner electrode group 6 is set as N, the electrodes are labeled, the outer electrode group is represented by W, the inner electrode group is represented by N, and the upper, middle and lower layers of the electrode groups are represented by A, B and C respectively, and the specific measurement process is as follows:
the inner set of electrodes 6 and the electrode probes 7 are both located above the top of the outer tube wall 3. The capacitance values between the electrode pairs of the outer electrode group 4 are measured in a certain sequence. The method specifically comprises the following steps: the outer electrode group 4 comprises an upper layer electrode, a middle layer electrode and a lower layer electrode, wherein the same layer electrode is positioned at the same horizontal height, measurement is sequentially carried out layer by layer from top to bottom, and each layer can obtain N (N-1)/2 effective capacitance values. When a certain layer works, except the exciting electrode and the measuring electrode, the other electrodes are grounded, and the other two layers are kept in a grounded state. For example, when N =12, first, the capacitance value between the upper layer (WA) electrodes is measured. When WA1 electrode is an exciting electrode, WA2-WA12 electrodes are sequentially arranged as measuring electrodes to obtain capacitance values between WA1-WA2, WA1-WA3, 8230, WA1-WA11 and WA1-WA12 electrode pairs. And then, the WA2 electrode is taken as an excitation electrode, WA3-WA12 electrodes are sequentially arranged as measurement electrodes, and the capacitance values between the WA2-WA3, 8230, the WA2-WA11, the WA2-WA12 electrode pairs and the like are obtained. When the capacitance value between the upper electrodes is measured, the middle electrode group and the lower electrode group are all grounded, and when the capacitance value between the upper WA1-WA2 electrode pairs is measured, the electrodes WA3, WA4, \ 8230 \ 8230;, WA12 are all grounded. Similarly, two groups of capacitance values of the middle layer and the lower layer of the outer electrode group can be obtained, and a reconstructed image of the distribution of the medium in the region of the outer tube wall 3 can be obtained through image reconstruction.
S130: and moving the inner pipe wall, moving the inner electrode group to the inner side of the outer pipe wall along the axial direction of the inner pipe wall, aligning the inner electrode group and the outer electrode group coaxially along the top end, and measuring the capacitance value between each inner electrode pair of each layer of the inner electrode group.
The motor of the telescopic device works to enable the spiral rod 8 to drive the inner pipe wall 5 and the electrode probe 7 to move, the inner pipe wall 5 and the electrode probe 7 move to the inner part of the outer pipe wall 3, and capacitance values between electrode pairs between the inner electrode groups are collected according to the sequence of the previous step. The specific acquisition method is the same as that of the outer electrode group, three groups of capacitance values of the upper layer, the middle layer and the lower layer are obtained, the value data of each layer is N (N-1)/2, and the reconstructed image of the medium distribution in the area in the inner tube wall 6 is obtained through image reconstruction.
S140: collecting capacitance values between each inner electrode in the inner electrode group and the appointed outer electrode in the same layer in the outer electrode group; the appointed outer electrodes in the same layer in the outer electrode group comprise outer electrodes opposite to the inner electrodes, and a left outer electrode and a right outer electrode which are adjacent to the opposite outer electrodes.
And collecting capacitance values between each inner layer electrode and the corresponding outer layer electrode, wherein the corresponding outer layer electrode comprises an electrode right opposite to the inner layer electrode, and a left electrode and a right electrode adjacent to the right electrode.
For example, when the inner electrode NA2 is used as an excitation electrode, the outer electrodes WA1, WA2, and WA3 are used as measurement electrodes in sequence, and three capacitance values NA2 to WA1, NA2 to WA2, and NA2 to WA3 are obtained. By analogy, each layer can get 3N capacitance values. When N =12, the inner electrode group 6 and the outer electrode group 4 are developed as shown in fig. 5. The manner of selecting electrode pairs for electrode measurement between the inner and outer layers is shown in FIG. 6.
S150: and moving the electrode probe to the inner part of the inner pipe wall, and acquiring the capacitance value between each inner layer electrode in the inner layer electrode group and the electrode probe.
The electrode probe 7 is moved to a central position coaxial with the inner electrode group 6, the electrode probe 7 is used as an excitation electrode, each electrode of the inner electrode group 6 is a measuring electrode in turn, and a group of capacitance values are acquired. Each layer will yield N capacitance values. The electrode pair was selected as shown in FIG. 7.
It should be noted that all electrodes, when not acting as measurement and excitation electrodes, are grounded, and the shielding system is always grounded.
After the measurement is finished, the sensor comprises an upper layer, a middle layer and a lower layer, and image reconstruction data obtained by each layer are as follows: the first step of measurement obtains N (N-1)/2 capacitance values, the second step of measurement obtains N (N-1)/2 capacitance values, the third step of measurement obtains 3N capacitance values, the fourth step of measurement obtains N capacitance values, effective capacitance values N (N + 3) are obtained in each layer in total, and the effective capacitance values are far larger than the N (N-1)/2 capacitance values obtained by a traditional ECT sensor. When N =12, the conventional ECT sensor obtains 66 capacitance values, whereas the present invention obtains 180 capacitance values, which are 2.72 times that of the conventional ECT sensor, greatly increasing the number of effective capacitances.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. An image data acquisition method based on a capacitance tomography sensor, which uses a nested capacitance tomography sensor to perform image inversion on different medium distribution conditions inside the sensor, and is characterized in that the nested capacitance tomography sensor comprises: the device comprises a shielding cover, a radial shielding electrode, an outer pipe wall, an outer electrode group tightly attached to the outer side of the outer pipe wall, an inner electrode group tightly attached to the outer side of the inner pipe wall and an electrode probe; the shielding cover is connected with the outer pipe wall through a plurality of radial shielding electrodes arranged at equal intervals, the outer electrode groups are attached to the outer side of the outer pipe wall at equal intervals, and the inner electrode groups are attached to the outer side of the inner pipe wall at equal intervals; the electrode probe is arranged at the central position of the inner side of the inner tube wall; the image data acquisition method based on the capacitance tomography sensor comprises the following steps:
multi-phase substances are distributed in the outer pipe wall, and the shielding cover and the radial shielding electrode are fixed on the outer side of the outer pipe wall to form a whole;
adjusting the relative positions of the inner tube wall, the electrode probes and the outer tube wall to enable the inner electrode group and the electrode probes to be positioned above the top of the outer electrode group, and measuring the capacitance value between each inner electrode pair of each layer of the outer electrode group;
moving the inner pipe wall, moving the inner electrode group to the inner side of the outer pipe wall along the axial direction of the inner pipe wall, wherein the inner electrode group and the outer electrode group are coaxial and aligned along the top end, and measuring the capacitance value between each inner electrode pair of each layer of the inner electrode group;
collecting capacitance values between each inner electrode in the inner electrode group and the appointed outer electrode at the same level in the outer electrode group; the appointed outer layer electrodes in the same layer in the outer layer electrode group comprise outer layer electrodes opposite to the inner layer electrodes and a left outer layer electrode and a right outer layer electrode which are adjacent to the opposite outer layer electrodes;
and moving the electrode probe to the inner part of the inner pipe wall, and acquiring the capacitance value between each inner layer electrode in the inner layer electrode group and the electrode probe.
2. The method as claimed in claim 1, wherein the electrode probe is a metal cylinder with adjustable diameter, and the shielding case, the radial shielding electrode, the inner electrode set, the outer electrode set, and the electrode probe are made of metal material with good electrical conductivity.
3. The method of claim 1, wherein the inner and outer tubular walls are made of a non-conductive material.
4. The method of claim 1, wherein the capacitance between two electrodes is measured, one of the electrodes is used as an excitation electrode, the other electrode is used as a measurement electrode, and the other electrodes are grounded.
5. The method for collecting image data based on an electrical capacitance tomography sensor as claimed in claim 4, characterized in that, when collecting the capacitance value between the electrodes, a capacitance measuring device is used for collection; the capacitance measuring device comprises an excitation signal end, a capacitance measuring end, a grounding end and a gating circuit; each electrode in the inner electrode group and the outer electrode group is connected with a gating circuit, and each gating circuit is connected with an excitation signal end, a capacitance value measuring end and a grounding end of the capacitance measuring device; when the capacitance value between the electrodes is measured, the gating circuit connected with the electrodes as the exciting electrodes is conducted with the lead of the exciting signal end of the capacitance measuring device, and is cut off with the lead of the capacitance measuring end of the capacitance measuring device, and the gating circuit connected with the electrodes as the measuring electrodes is cut off with the lead of the exciting signal end of the capacitance measuring device, and is conducted with the lead of the capacitance measuring end of the capacitance measuring device.
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| CN1395093A (en) * | 2001-07-06 | 2003-02-05 | 中国科学院工程热物理研究所 | Square capacitance chromatographic imaging sensor |
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| CN105501856A (en) * | 2015-12-11 | 2016-04-20 | 江苏大学 | Powder filling rate detecting device and method of separation device of spiral quantitative charger |
| CN105973775A (en) * | 2016-04-29 | 2016-09-28 | 江苏大学 | Apparatus for detecting concentration of powder in spiral conveying tube of bilayer electrode array |
| CN106932446A (en) * | 2015-12-31 | 2017-07-07 | 中国科学院工程热物理研究所 | A kind of capacitance tomography sensor |
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| US11598739B2 (en) * | 2018-03-13 | 2023-03-07 | Penny Precision Llc | Methods and systems for high fidelity electrical tomographic processes |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1395093A (en) * | 2001-07-06 | 2003-02-05 | 中国科学院工程热物理研究所 | Square capacitance chromatographic imaging sensor |
| CN1793879A (en) * | 2005-12-22 | 2006-06-28 | 天津大学 | Compound array sensor of ERT/ECT bimodel state imaging system |
| CN105501856A (en) * | 2015-12-11 | 2016-04-20 | 江苏大学 | Powder filling rate detecting device and method of separation device of spiral quantitative charger |
| CN106932446A (en) * | 2015-12-31 | 2017-07-07 | 中国科学院工程热物理研究所 | A kind of capacitance tomography sensor |
| CN105973775A (en) * | 2016-04-29 | 2016-09-28 | 江苏大学 | Apparatus for detecting concentration of powder in spiral conveying tube of bilayer electrode array |
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