CN102798440A - Continuous kernel level monitoring method and device for realizing same - Google Patents
Continuous kernel level monitoring method and device for realizing same Download PDFInfo
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- CN102798440A CN102798440A CN2012102883819A CN201210288381A CN102798440A CN 102798440 A CN102798440 A CN 102798440A CN 2012102883819 A CN2012102883819 A CN 2012102883819A CN 201210288381 A CN201210288381 A CN 201210288381A CN 102798440 A CN102798440 A CN 102798440A
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Abstract
A continuous kernel level monitoring method and a device for realizing the same belong to the technical field of radioactive continuous level detection techniques. The continuous kernel level monitoring method and the device solve the problems of low measuring efficiency, high cost and poor measuring accuracy in the prior art and overcome the technology biases in the conventional similar technologies. According to the invention, a radiation source is arranged on one side of a detected tank body and is used for transmitting rays; two detectors for receiving the rays are arranged on the other side of the detected tank body; the two detectors are arranged in the vertical direction, wherein the upper detector is arranged in the upper position, and the lower detector is arranged in the lower position; the radiation source and the detectors synchronously do a one-dimensional rectilinear motion in the vertical direction; in addition, the heights of the radiation source and the detectors are adjusted according to three combined states of signals that are acquired by the two detectors, so that the level in the detected tank body is monitored. The continuous kernel level monitoring method and the device are especially suitable for continuous level detection in harsh environment, and are particularly suitable for continuous level measurement in toxic, inflammable, explosive, high-temperature and high-pressure harsh environment.
Description
Technical field
The invention belongs to radioactivity continuous material level detection technique field.
Background technology
Thing position detection technique has important effect in the industrial processes of reality, through to the accurately measuring of thing position, can guarantee the optimization control of production run.Thing position product category in producing family's practice is more at present, can be divided into contact type measurement and non-contact measurement by the measurement form.Nuclear thing position monitoring device need not to change the intrinsic shape of the tank body of installing 20 because nondestructive measurement is carried out in its noncontact, is adapted to the thing position monitoring under the rugged surroundings especially; Has reliable operation; Measure accurately, advantage easy to maintenance has in real work very widely and uses.
Utilizing at present the continuous kernel thing position measuring instrument of radiation absorption principle both at home and abroad, generally is to adopt three kinds of forms: the structure of line source and line detector; The structure of line source and point probe; The structure of point source and line detector.1., price comparison is expensive but three fatal shortcomings are arranged in application:; 2., poor anti jamming capability, reliability is low; 3., because the nuclear instrument needs manufacturer's Installation and Debugging, give install, debugging and maintenance in the future make troubles, and also increased expense.
This project succeed in developing alternative external product, and reduce the price of instrument significantly, make things convenient for demestic user's operation and maintenance.
Summary of the invention
The efficiency of measurement that exists in the measuring instrument measuring process of existing continuous kernel thing position is low, cost is high, the problem of measurement poor accuracy in order to solve in the present invention; And overcome the technological prejudice of existing similar technology, designed a kind of continuous kernel thing position monitoring method and realized the device of this method.
Continuous kernel thing position monitoring method of the present invention is:
Side at tank body to be detected is provided with two detectors, and said two detectors are vertically arranged, and is positioned at the top last detector that is, is positioned at the following following detector that is; Opposite side at tank body to be detected is provided with a radiation source, is used for divergent-ray; Said two detectors are used for the ray of received radiation source emission;
Said radiation source and detector are vertically done the one dimension rectilinear motion synchronously;
The signal of said two detector collections has three kinds of assembled state, and said three kinds of assembled state are respectively:
State one: the signal intensity that last detector receives radiation source is greater than threshold value; And the signal intensity that following detector receives radiation source is less than threshold value; Said thing bit position judges that then the thing position is two detector position intermediate between last detector and following detector;
State two: the signal intensity that goes up detector and the received radiation source of following detector judges then that all greater than threshold value radiation source is above the thing position;
State three: the signal intensity that goes up detector and the received radiation source of following detector judges then that all less than threshold value radiation source is below the thing position;
According to the height of said three kinds of assembled state adjustment radiation source and detector, and then realize the monitoring of the thing position in the tank body to be detected.
Above-mentioned height according to said three kinds of assembled state adjustment radiation source and detector, and then realize that the method for the monitoring of the thing position in the tank body to be detected is:
At state two, control radiation source and detector move downward, and are state one up to the signal of said two detector collections;
At state three, control radiation source and detector move upward, and are state one up to the signal of said two detector collections;
At state one, keep radiation source and detector position constant, with the centre position of two detectors as the thing position.
The emission signal that above-mentioned radiation source sends is a gamma-rays.
Continuous kernel thing of the present invention position monitoring device comprises radiation source, two detectors, elevating mechanism, elevating mechanism driver element and signal processing units; Said elevating mechanism is used to drive radiation source and two detectors rise or decline synchronously; Said two detectors are vertically arranged; Upgrading mechanism driver element is used for the driver upgrade mechanism kinematic; Signal processing unit receives the signal that two-tube detector sends, and the drive signal of upgrading mechanism driver element is handled and then generated to said signal, and said signal processing unit sends to upgrading mechanism driver element with this drive signal.
Two ray receiving tubes of above-mentioned two-tube detector are vertically arranged.
When practical application; Radiation source and two-tube detector are symmetricly set on the both sides of tested tank body, and to make the line of the two be horizontal line, the radiation signal of radiation source emission is incident to tested tank body; Two-tube detector receives this radiation signal at the opposite side of tested tank body; Referring to shown in Figure 1, the signal that the signal processing unit basis receives is judged the relation of radiation source and two-tube detector line and tank interior thing position, and according to the said output drive signal that concerns; Control upgrading mechanism drives radiation source and two-tube detector rises or decline, knows that said line and tested tank interior thing position coincide.Said line is meant the lines of two pipe position intermediate of position that radiation source transmits and two-tube detector.
Principle of work of the present invention is: radiation source sends ray, pass tested tank body and interior media after, the two-tube detector that is placed on the tank body opposite side receives; After in ray is injected tank body; When running into the medium in the jar, said ray is absorbed by medium, and two-tube detector does not receive ray; This shows that the pipe position that does not receive ray signal in the two-tube detector is lower than thing position height; And after ray is injected tank interior, do not run into a jar interior medium, and said ray is received by the two-tube detector of opposite side, and this shows that the pipe position that receives ray signal in the two-tube detector is higher than thing position height; Pipe above being positioned in two pipes of said two-tube one-sided device receive ray signal and below being positioned at do not receive ray signal the time, show that the thing position is just in the centre position of two pipes.
According to above-mentioned principle, the distance between two pipes in the two-tube detector can rationally be set, and then set accuracy of detection.
The logic determines principle of continuous kernel thing of the present invention position monitoring device is:
Gamma-rays passes tested container and medium behind collimation, after medium absorbs, received by two-tube scintillation detector.The counting rate of the received signal of detector is relevant with the position of medium in the tested container.After the media location in the detector changes, can obtain the two-tube measured data that obtain in the detector, its logical relation has three kinds of possibilities:
1, two detectors 17 all receive ray, or the transmitted intensity that receives is greater than threshold value;
2, go up detector and receive ray, or the transmitted intensity that receives is greater than threshold value; Following detector does not receive ray, or the transmitted intensity that receives is less than threshold value;
3, detector does not all receive ray up and down, or the transmitted intensity that receives is less than threshold value.
In real work, need to measure simultaneously the same a branch of gamma-ray perhaps size that has or not of passing container; The transmitted intensity received as if a detector in two detectors is little; When the transmitted intensity that another detector received was big, then the charge level height was between two detectors.If the transmitted intensity that receives of two detectors is identical, then explanation this place is not the material level interface, then controls radioactive source and two detectors move, and until finding charge level, and tracking has reached the purpose of continuous coverage material level.
Advantage of the present invention by:
1. adopt two detectors to carry out the design of acquired signal; Judge through processor logic, control two detectors also radioactive source move, with the metering system realization thing position continuous coverage of fixed point; The size of error depends on the structure of detector in measuring process; Relative error makes zero, and large range measuring is had higher precision, has improved the stability and the measuring accuracy of system.
2. thing position detection part is outside at tank body, has overcome to have the conventional techniques thought that thing position detection part is placed on tank interior now, and the level gauging parts are placed on the tested tank body outside.Level gauging parts of the present invention do not contact with the tank interior part, and need not the structure at tank interior design and installation level gauging parts yet, that is: do not destroy the tank interior structure, do not take the tank interior volume.Article position measuring method of the present invention and device do not produce any change to the equipment under test structure, and original function is not produced any influence yet.Device of the present invention is convenient to install, debugs and is safeguarded.
3. this project is to utilize gamma-rays noncontact (penetrating) metering system, thereby is specially adapted to the level gauging in the container under toxicity, inflammable and explosive, high temperature, the high pressure rugged surroundings.
4. utilize the nuclear physics measuring principle to design, adopt ray collimation mode to measure, reduce the scattering error influence; Adopt the contactless continuous measuring mode, under measuring accuracy did not receive situation that changes in environmental conditions influences, reliable and stable, maintenance was little.
5, with point source as emitter, the form that two-tube detector receives, motor is with the measuring method of motion tracking, the reaction time of improving system and material level change the speed of tracking.
The present invention is for adapting to nuclear thing position measuring instrument development trend, and being applicable to of design has the top level gauging in flow velocity liquid place greatly.This device utilizes the nuclear physics measuring principle to be the basis; Adopt the signals collecting mode of point source as emissive source, double detector; Signal according to two-tube scintillation detector obtains thing position information; And the measurement form of control motor servo-actuated real-time follow-up, realize the requirement of continuous coverage large range measuring being had higher precision with the measurement form of fixed point thing position.
The present invention is particularly useful for detecting as the continuous material level under the rugged surroundings, and the continuous material level that is specially adapted under toxicity, inflammable and explosive, high temperature, the high pressure rugged surroundings is measured.
Description of drawings
Fig. 1 is the principle schematic of continuous kernel thing position monitoring method of the present invention.
Fig. 2 is the vertical view of continuous kernel thing of the present invention position monitoring device.
Fig. 3 is the side view of continuous kernel thing of the present invention position monitoring device.
Embodiment
Embodiment one, the described continuous kernel thing of this embodiment position monitoring method are:
Side at tank body 20 to be detected is provided with two detectors, and said two detectors are vertically arranged, and is positioned at the top last detector that is, is positioned at the following following detector that is; Opposite side at tank body 20 to be detected is provided with a radiation source, is used for divergent-ray; Said two detectors are used for the ray of received radiation source emission;
Said radiation source and detector are vertically done the one dimension rectilinear motion synchronously;
The signal of said two detector collections has three kinds of assembled state, and said three kinds of assembled state are respectively:
State one: the signal intensity that last detector receives radiation source is greater than threshold value; And the signal intensity that following detector receives radiation source is less than threshold value; Said thing bit position judges that then the thing position is two detector position intermediate between last detector and following detector;
State two: the signal intensity that goes up detector and the received radiation source of following detector judges then that all greater than threshold value radiation source is above the thing position;
State three: the signal intensity that goes up detector and the received radiation source of following detector judges then that all less than threshold value radiation source is below the thing position;
According to the height of said three kinds of assembled state adjustment radiation source and detector, and then realize the monitoring of the thing position in the tank body to be detected.
The principle of the described continuous kernel thing of this embodiment position monitoring method is to develop according to the principle of absorption of medium in the jar to ray; Its absorbing rule meets Beer law; Be after beam,gamma-ray passes absorbing material; Its transmitted intensity will be decayed by index law, can be expressed as like minor function:
I=I
0e
-μdρ （1）
I
0Be respectively gamma-rays by the intensity before and after the material absorbing with I; μ is a mass absorption coefficient, and unit is cm
2/ g;
D is a thickness, and unit is cm; ρ is a density, and unit is g/cm
3
To intrinsic medium in the container, formula 1 can be reduced to:
I=I
0e
-μt （2）
T is a mass thickness, and unit is g/cm
2
To fixed point level gauging situation, when the thing position of container inner medium reaches the level meter setting height(from bottom), the transmitted intensity that sniffer receives will change, with I
1(transmitted intensity when material is full), I
2(transmitted intensity when material is empty) expression can get according to formula 2:
I
1=I
0e
-μt1，
I
2=I
0e
-μt2，
When in the container absorbing medium being arranged, i.e. t=t
1Had in＞0 o'clock: I
1/ I
0=exp (μ t
1)＜1,
When in the container during no absorbing medium, i.e. t=t
2Had in=0 o'clock: I
2/ I
0=exp (μ t
2)=1,
Therefore, receive corresponding threshold value of intensity different set of ray according to detector, transmitted intensity that measures and threshold are judged, confirm the situation of change of thing position, to realize the fixed point level gauging.
Embodiment two, this embodiment are the further qualifications to embodiment one described continuous kernel thing position monitoring method; In this embodiment; According to the height of said three kinds of assembled state adjustment radiation source and detector, and then realize that the method for the monitoring of the thing position in the tank body to be detected is:
At state two, control radiation source and detector move downward, and are state one up to the signal of said two detector collections;
At state three, control radiation source and detector move upward, and are state one up to the signal of said two detector collections;
At state one, keep radiation source and detector position constant, with the centre position of two detectors as the thing position.
Embodiment three, this embodiment are the further qualifications to embodiment one described continuous kernel thing position monitoring method, and in this embodiment, the emission signal that said radiation source sends is a gamma-rays.
Embodiment four, this embodiment are the further qualifications to embodiment one described continuous kernel thing position monitoring method, and in this embodiment, what said radiation source sent is
137Cs γ point ray.
Embodiment five, this embodiment are the further qualifications to embodiment four described continuous kernel thing position monitoring methods, in this embodiment, and the ray energy 661Kev that said radiation source sends, intensity 2 * 10
9Bq.
Above-mentioned radiation source can adopt sealing
137The Cs gamma ray dot source, physical dimension ф 8mm * 9mm, ray energy 661Kev, intensity 2 * 10
9Bq, 31 years half life period; Radiation source container is to penetrate slit with the plumbous lockable ray of processing that has, through this slit, but ray directive probe.This kind structure not only can be exported ray, can also effectively play protective action, and is convenient to the radiation source installation.
Embodiment six, this embodiment are the further qualifications to embodiment one described continuous kernel thing position monitoring method, and described two detectors 17 of this embodiment adopt scintillation detector to realize.
The two-tube scintillation detector that this embodiment adopts receives only pipe by two to be formed, the crystal by adopting plastic crystal, and crystalline size ф 28mm * 25mm, the photomultiplier model is CR110, spectral response range: 300～650nm; Peak response wavelength: 420nm.
Embodiment seven, the described continuous kernel thing of this embodiment position monitoring device comprise radiation source 18, two detectors 17, elevating mechanism, elevating mechanism driver element and signal processing units; Said elevating mechanism is used to drive radiation source 18 and two detectors 17 rise or decline synchronously; Said two detectors 17 are vertically arranged; Upgrading mechanism driver element is used for the driver upgrade mechanism kinematic; Signal processing unit receives the signal that two-tube detector 17 sends, and the drive signal of upgrading mechanism driver element is handled and then generated to said signal, and said signal processing unit sends to upgrading mechanism driver element with this drive signal.
The described signal processing unit of this embodiment adopts chip microcontroller.
Embodiment eight, this embodiment are the further qualifications to embodiment one described continuous kernel thing position monitoring device; The described continuous kernel thing of this embodiment position monitoring device also comprises position-limit mechanism; Said position-limit mechanism is used for the extreme higher position and the extreme lower position in limits radiated source, and said position-limit mechanism output limit signal is given signal processing unit.
Embodiment nine, referring to shown in Fig. 2 and 3 explanation this embodiment.This embodiment is the further qualification to embodiment one described continuous kernel thing position monitoring device; Elevating mechanism described in this embodiment adopts a pair of steel wire to realize around wheel 2, transmission shaft 10, speed reduction unit 14 and gear train; Said upgrading mechanism driver element adopts drive motor 15 to realize; The output shaft of said drive motor 15 drives transmission shaft 10 through speed reduction unit 14, gear train and rotates; A pair of steel wire is around the two ends that wheel 2 is separately fixed at transmission shaft 10, and the end of the steel wire 1 that steel wire twines on wheel 2 is radiation source 18 fixedly, and the end of the steel wire 1 that another steel wire twines on wheel 2 is fixed by two detectors 17.
The described technical scheme of this embodiment is when practical application, if the weight of detector 17 is too little, and when causing making steel wire to stretch, sash weight 17 of following increase of detector 17.Perhaps the end with steel wire is fixed on the peak of tank body thing position, between the terminal and fixing detector 17 on the steel wire, articulates a sash weight 17 then, and referring to shown in Figure 3, said sash weight 17 steel wire 1 that is used to stretch makes its linearly shape.
Embodiment ten, referring to shown in Fig. 2 and 3 explanation this embodiment.This embodiment is the further qualification to embodiment three described continuous kernel thing position monitoring devices; The centre of the transmission shaft described in this embodiment is provided with thread segment 9; Said thread segment 9 is provided with nut 8; Laterally arranging with said thread segment 9 is fixed with polished rod 4, is respectively arranged with upper limit sensor 3 and lower limit sensor 5 at the two ends of this polished rod 4, is fixedly connected with spacing drivings excellent 7 on the said nut 8; This spacing end and polished rod 4 that drives rod 7 is slidingly connected; When the spacing end that drives rod 7 contacted with lower limit sensor 5, said radiation source 18 was positioned at extreme lower position, when the spacing end that drives rod 7 contacts with upper limit sensor 3; Said radiation source 18 is positioned at the extreme higher position, and the switching signal output terminal of upper limit sensor 3 is connected with two limit signal input ends of signal processing unit respectively with the switching signal output terminal of lower limit sensor 5.
Embodiment 11, this embodiment are that the described radiation source 18 of this embodiment is gamma-ray radiation sources to the further qualification of embodiment one, two, three or four described continuous kernel thing position monitoring devices.
Embodiment 12, this embodiment are the further qualifications to embodiment one, two, three or four described continuous kernel thing position monitoring devices, and the described radiation source 18 of this embodiment is sealings
137The Cs gamma ray dot source.
Embodiment 13, this embodiment are the further qualifications to embodiment one, two, three or four described continuous kernel thing position monitoring devices, the ray energy 661Kev of the described radiation source 18 of this embodiment, intensity 2 * 10
9Bq.
Embodiment 14, this embodiment are the further qualifications to embodiment one, two, three or four described continuous kernel thing position monitoring devices, and the described detector 17 of this embodiment is a photomultiplier.
Embodiment 15, this embodiment are the further qualifications to embodiment one, two, three or four described continuous kernel thing position monitoring devices, and described two detectors 17 of this embodiment adopt two-tube photomultiplier to realize.
Claims (10)
1. continuous kernel thing position monitoring method is characterized in that, said monitoring method is:
Side at tank body to be detected is provided with two detectors, and said two detectors are vertically arranged, and is positioned at the top last detector that is, is positioned at the following following detector that is; Opposite side at tank body to be detected is provided with a radiation source, is used for divergent-ray; Said two detectors are used for the ray of received radiation source emission;
Said radiation source and detector are vertically done the one dimension rectilinear motion synchronously;
The signal of said two detector collections has three kinds of assembled state, and said three kinds of assembled state are respectively:
State one: the signal intensity that last detector receives radiation source is greater than threshold value; And the signal intensity that following detector receives radiation source is less than threshold value; Said thing bit position judges that then the thing position is two detector position intermediate between last detector and following detector;
State two: the signal intensity that goes up detector and the received radiation source of following detector judges then that all greater than threshold value radiation source is above the thing position;
State three: the signal intensity that goes up detector and the received radiation source of following detector judges then that all less than threshold value radiation source is below the thing position;
According to the height of said three kinds of assembled state adjustment radiation source and detector, and then realize the monitoring of the thing position in the tank body to be detected.
2. continuous kernel thing position monitoring method according to claim 1 is characterized in that, according to the height of said three kinds of assembled state adjustment radiation source and detector, and then realizes that the method for the monitoring of the thing position in the tank body to be detected is:
At state two, control radiation source and detector move downward, and are state one up to the signal of said two detector collections;
At state three, control radiation source and detector move upward, and are state one up to the signal of said two detector collections;
At state one, keep radiation source and detector position constant, with the centre position of two detectors as the thing position.
3. continuous kernel thing position monitoring method according to claim 1 is characterized in that the emission signal that said radiation source sends is a gamma-rays.
4. continuous kernel thing according to claim 1 position monitoring device is characterized in that what said radiation source sent is
137Cs γ point ray.
5. continuous kernel thing according to claim 4 position monitoring device is characterized in that the ray energy 661Kev that said radiation source sends, intensity 2 * 10
9Bq.
6. continuous kernel thing position monitoring device; It is characterized in that; Said monitoring device comprises radiation source (18), two detectors (17), elevating mechanism, elevating mechanism driver element and signal processing unit; Said elevating mechanism is used to drive radiation source (18) and two detectors (17) rise or decline synchronously; Said two detectors (17) are vertically arranged, and upgrading mechanism driver element is used for the driver upgrade mechanism kinematic, and signal processing unit receives the signal that two-tube detector (17) sends; And said signal handled and then generates the drive signal of upgrading mechanism driver element, said signal processing unit sends to upgrading mechanism driver element with this drive signal.
7. continuous kernel thing according to claim 6 position monitoring device; It is characterized in that; Also comprise position-limit mechanism in the said monitoring device, said position-limit mechanism is used for the extreme higher position and the extreme lower position in limits radiated source, and said position-limit mechanism output limit signal is given signal processing unit.
8. continuous kernel thing according to claim 6 position monitoring device; It is characterized in that; Said elevating mechanism adopts a pair of steel wire to realize around wheel (2), transmission shaft (10), speed reduction unit (14) and gear train; Said upgrading mechanism's driver element employing drive motor (15) is realized; The output shaft of said drive motor (15) drives transmission shaft (10) and rotates through speed reduction unit (14), gear train; A pair of steel wire is separately fixed at the two ends of transmission shaft (10) around wheel (2), and the end that steel wire is gone up the steel wire (1) that twines around wheel (2) is radiation source (18) fixedly, and the end that another steel wire is gone up the steel wire (1) that twines around wheel (2) is fixed by two detectors (17).
9. continuous kernel thing according to claim 8 position monitoring device; It is characterized in that; The centre of institute's transmission shaft is provided with thread segment (9), and said thread segment (9) is provided with nut (8), and laterally arranging with said thread segment (9) is fixed with polished rod (4); Be respectively arranged with upper limit sensor (3) and lower limit sensor (5) at the two ends of this polished rod (4); Be fixedly connected with spacing driving rod (7) on the said nut (8), this spacing end and polished rod (4) that drives rod (7) is slidingly connected, when the spacing end that drives excellent (7) and lower limit sensor (5) when contacting; Said radiation source (18) is positioned at extreme lower position; When the spacing end that drives rod (7) and upper limit sensor (3) when contacting, said radiation source (18) is positioned at the extreme higher position, and the switching signal output terminal of the switching signal output terminal of upper limit sensor (3) and lower limit sensor (5) is connected with two limit signal input ends of signal processing unit respectively.
10. continuous kernel thing according to claim 6 position monitoring device is characterized in that said radiation source (18) is a gamma-ray radiation source.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760150A (en) * | 2014-01-21 | 2014-04-30 | 曹际娟 | Photon counter and chemiluminescence detection equipment comprising photon counter |
| CN105241523A (en) * | 2015-11-04 | 2016-01-13 | 成都南方电子仪表有限公司 | Radioactive waste resin interface measurement device and measurement method thereof |
| CN108692794A (en) * | 2018-03-30 | 2018-10-23 | 哈尔滨共阳科技咨询有限公司 | A kind of detection adjusting apparatus of level-sensing device |
| CN109959426A (en) * | 2017-12-22 | 2019-07-02 | 佛山市顺德区美的电热电器制造有限公司 | Cooking apparatus, reserves detection method and computer readable storage medium |
| CN113474032A (en) * | 2019-02-25 | 2021-10-01 | 英特外科股份公司 | Improvements relating to humidifiers for respiratory gases |
| CN113739670A (en) * | 2021-08-26 | 2021-12-03 | 云南国钛金属股份有限公司 | CTT storage tank slurry thickness measuring device and measuring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760150A (en) * | 2014-01-21 | 2014-04-30 | 曹际娟 | Photon counter and chemiluminescence detection equipment comprising photon counter |
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| CN113474032B (en) * | 2019-02-25 | 2024-04-30 | 英特外科股份公司 | Improvements relating to humidifiers for breathing gases |
| CN113739670A (en) * | 2021-08-26 | 2021-12-03 | 云南国钛金属股份有限公司 | CTT storage tank slurry thickness measuring device and measuring method |
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Application publication date: 20121128 |