CN106595809A - Non-contact type infrared thermal imaging liquid level online detection method for railway tanker - Google Patents
Non-contact type infrared thermal imaging liquid level online detection method for railway tanker Download PDFInfo
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- CN106595809A CN106595809A CN201611223269.1A CN201611223269A CN106595809A CN 106595809 A CN106595809 A CN 106595809A CN 201611223269 A CN201611223269 A CN 201611223269A CN 106595809 A CN106595809 A CN 106595809A
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- 239000007788 liquid Substances 0.000 title claims abstract description 51
- 238000001931 thermography Methods 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 title claims abstract description 24
- 238000010998 test method Methods 0.000 claims description 10
- 238000003331 infrared imaging Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 6
- 238000012545 processing Methods 0.000 description 11
- 238000005259 measurement Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000035807 sensation Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003708 edge detection Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
- G01F23/292—Light, e.g. infrared or ultraviolet
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10016—Video; Image sequence
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10024—Color image
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10048—Infrared image
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30236—Traffic on road, railway or crossing
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Quality & Reliability (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Theoretical Computer Science (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
The invention relates to the technical field of liquid level detection and particularly relates to a non-contact type infrared thermal imaging liquid level online detection method for a railway tanker. The method is characterized by at least comprising the following steps: judging a driving vehicle on the railway, judging if the driving vehicle is a tanker, namely, performing in-place detection for the tanker; if the driving vehicle on the railway is the tanker, collecting the infrared thermal imaging pictures of the tanker body of the tanker; recognizing the upper and lower boundary and the liquid level boundary of the tanker according to the infrared thermal imaging pictures; calculating the height ratio of the upper and lower boundary to the liquid level boundary of the tanker; and on the basis of the model of the tanker, converting and acquiring a practical liquid level height value in the tanker body of the tanker. The method has the advantages that the performance is stable, the operation is simple and convenient, the method can be applied at night and under other severe weathers, the problem of the liquid level detection of the tanker freight at present can be solved and the transportation safety can be guaranteed.
Description
Technical field
The present invention relates to Technology of Level Detection field, especially a kind of contactless tank car infrared thermal imaging liquid level exist
Line detecting method.
Background technology
Tank car transport accounts for more than 90 percent in Railway Dangerous Goods Transport, how to operating tank car liquid
Always one difficult point is detected in position, and it is very tight in current rail cargo security to design a set of effective measurement apparatus
One of urgent work.
According to《Railway Dangerous Goods Transport management rule》In the 99th article of regulation, " filling weight cannot be greater than tank car
Marked loading capacity of wagon；Expansion space is left simultaneously, and the filling weight upper limit cannot be greater than the 95% of tank body mark volume, and lower limit must not be little
The 83% of volume is marked in tank body.Referring in particular to《Fill table》Middle requirement." this specifies to specify that tank car transport in order to ensure peace
Entirely, its filling weight must in allowed band,《Fill table》According to filled class of liquids and tank car type, by volume and weight
Requirement has been converted into quasi- dress requirement for height, and upper and lower bound height value is listed in detail, therefore this device is directed to liquid level
Measure.
At present tank car filling weight is only measured when filling by the side of delivery, and railway does not have as transporter in transportation
There is any mode to carry out safety monitoring, difficult point is essentially consisted in：First, current metering system is the static survey after uncapping
Amount, and most of contained liquid due to it is inflammable, explosive or poisonous the characteristics of, be not suitable for being surveyed using this kind of mode in transportation
Amount；2nd, because tank car is bulky, heterogeneous, comparative maturity, accurate non-contact measurement apparatus are there is no at present.
The content of the invention
The purpose of the present invention is according to above-mentioned the deficiencies in the prior art, there is provided a kind of infrared heat of contactless tank car
Imaging liquid level online test method, by detecting in place to tank car, then using infrared thermal imaging to tank car tank body
Liquid level is identified analysis, realizes contactless on-line checking.
The object of the invention is realized being completed by technical scheme below：
A kind of contactless tank car infrared thermal imaging liquid level online test method, in the tank car to traveling on railway
Liquid level detected, it is characterised in that：The detection method is at least comprised the following steps：
Driving vehicle on the railway is judged, judges whether it is tank car, that is, carry out the detection in place of tank car；If sentencing
When the driving vehicle broken on the railway is tank car, the collection of infrared thermal imaging image is carried out to the tank body of the tank car；Root
According to the up-and-down boundary of tank car and liquid level line of demarcation described in the infrared thermal imaging image recognition；Calculate the upper following of the tank car
Boundary and the marginal height ratio value of liquid level, with reference to the model of the tank car, conversion obtains the reality in the tank body of the tank car
Border liquid level height value.
The detection in place of the tank car realized by arranging two distance measuring sensors, two distance measuring sensors court respectively
To the differing heights position of the tank body, the relative distance between its installation site and the tank body is detected respectively, according to relative
Distance carries out the detection in place of tank car.
Determine whether that vehicle passes through according to the output voltage size of the distance measuring sensor；Pass with reference to two range findings
The duration of difference and the difference between the output voltage of sensor judges whether the driving vehicle is tank car.
The infrared thermal imaging image recognition by be respectively adopted Sobel operators, Robert operators, Prewitt operators this
Three kinds of algorithms detect a plurality of line of demarcation in the tank body, then in conjunction with the testing result of three kinds of algorithms, are met simultaneously
The line of demarcation of these three algorithms, finally by color mode image procossing the up-and-down boundary and liquid level boundary of the tank car is obtained
Line.
The model of the tank car in the railway side by arranging infrared imaging device realization, the infrared imaging
Device shoots the tank body, and the startup of the infrared imaging device is satisfied with the detection in place of Jing tank cars, judges the railway
On driving vehicle for tank car requirement.
The model of the tank car in the railway side by arranging the realization of tank car information camera device, the tank car information
Camera device shoots the model of the tank car, and the detection in place of Jing tank cars is satisfied with the startup of the tank car information camera device,
Judge requirement of the driving vehicle on the railway for tank car.
It is an advantage of the invention that：Using non-contact measurement, measurement data is accurately given in real time；Whole device is arranged on
The outer distance of trackside 3m, and any annex need not be installed additional on tank car, operate safer；Each several part device power consumption is low, structure
Simply, the measurement particularly to oil truck is safer；It is stable performance, simple to operation, can be in night and other bad weathers just
Often use, can solve the problem that a level sensing difficult problem in current tank car shipping, ensure transportation safety.
Description of the drawings
Fig. 1 is the system construction drawing of the present invention；
Fig. 2 is the arrangement schematic diagram of signal supervisory instrument in place in the present invention.
Specific embodiment
Below in conjunction with accompanying drawing feature of present invention and other correlated characteristics are described in further detail by embodiment, so as to
In the understanding of technical staff of the same trade：
As shown in Figure 1-2,1-7 is marked to be expressed as in figure：Tank car 1, tank body 2, wheel 3, upper photosensor 4, bottom
Photoelectric sensor 5, data processing module 6, column 7.
Embodiment：Contactless tank car infrared thermal imaging liquid level online test method in the present embodiment can be depended on
A set of detecting system realizes, the detecting system mainly include being made up of upper and lower part photoelectric sensor and data processing module to
Position signal detection module, the host computer as processor and infrared thermal imaging module（Device）, tank car information shoot with video-corder module（Dress
Put）.In place signal detection module is provided between the two 482/232 protocol converter with upper structure into data cube computation, will
485 signals of data processing module output are converted to 232 signals for being available for host computer identifying processing.Host computer is according to detecting in place
The detection information control infrared thermal imaging module of module and tank car information shoot with video-corder module startup optimization.
On-line detecting system in the present embodiment is directed to the level sensing of tank car, as shown in Fig. 2 tank car 1 includes
Tank body 2 and wheel 3, wheel 3 is arranged on the bottom of frame for carrying tank body 2, and the storage inside of tank body 2 has the liquid of transport, for example
Oils or chemical liquid raw material class.Tank car 1 is travelled by wheel 3 on railway track, to convey liquid.
As shown in Fig. 2 in place signal detection module is included at upper photosensor 4, lower photosensor 5, data
Reason module 6, three is fixedly mounted on and arranges on the column 7 of side along the railway.Lower photosensor 5 is towards tank body 2
Waist location, upper photosensor 4 be located at lower photosensor 5 top, towards the waist above position of tank body 2,
Upper photosensor 4 and lower photosensor 5 are used to detect the distance between its installation site and tank body 2.With reference to Fig. 1
It is shown, the data cube computation upper photosensor 4 of data processing module 6 and lower photosensor 5, to receive top photoelectric sensing
The output signal of device 4 and lower photosensor 5, and judged according to data-signal.
Data processing module 6 is with ultimate range L, range difference S and these three parameters of signal output time T judging whether
There is vehicle to pass through, whether the vehicle of process is tank car.And these three parameters are adjusted by three potentiometers：
（1）Ultimate range L, is adjusted by potentiometer VR1, when upper photosensor 4 and lower photosensor 5 are not having
In the case of being blocked, two photoelectric sensors export maximum.Data processing module 6 is by the center of this value and VR1
Tap voltage is compared, if the output valve of photoelectric sensor is big, then it is assumed that pass through without vehicle.
（2）Range difference S, S are the distance between upper photosensor 4 and tank body 2 shown in Fig. 2 Lm and bottom photoelectricity
Difference between the distance between sensor 5 and tank body 2 L, is adjusted by potentiometer VR2.When the output of upper sensor 4
Voltage deducts the output voltage of lower sensor 5 more than the centre tapped voltages of VR2, judges that passed through vehicle is probably tank
Car.Explanation is additionally required herein, and this is the judgement realized using the circular cross-section structure of tank body 2, specifically, due to
The section of tank body 2 is circular, therefore the difference between Lm and L is larger, and Ruo Laiche is not tank car, then two photoelectric sensors is defeated
Go out signal to be more or less the same, then now judge that it is not tank car to carry out car.
（3）Signal output time T, is adjusted by potentiometer VR3.If in the range of T time, photoelectric sensor test
To object distance be both less than L, and 80% requirement for all meeting range difference S, i.e. difference between Lm and L continues set
Time, then in T, data processing module 6 judges that it is tank car to carry out car.Data processing module 6 exports " ON " word by RS484 interfaces
Symbol, is then converted into RS232 agreements and exports to host computer through 482/232 protocol converter.
Host computer is receiving the detection information of signal supervisory instrument in place, that is, judge what is currently travelled on rail track
After tank car, control infrared thermal imaging module and tank car information are shot with video-corder module and are operated.
Infrared thermal imaging module arrangement side along the railway, for carrying out video data to the tank car tank body in traveling
Collection.Because the temperature of liquid has differences with the temperature of air in tank car, different temperatures object is launched to external world different red
External wave, therefore at a certain distance from being installed in orbit using infrared ray thermal inductance instrument, you can the infrared thermal imaging image of collection tank car.
The most appropriate shooting time in every section compartment is gone out according to the reception Time Calculation of signal in place, to photograph the complete graph of every section tank car
Picture.
Tank car information shoots with video-corder module arrangement side along the railway, for shooting to the tank car in traveling, accurate
To information such as vehicle, license number, the species of contained liquid for being marked at tank car tank body surface, it is possible to graphic form, with the time
Name form is preserved, and is reviewed to carry out inquiry when liquid level data is abnormal.
Image with reference to captured by infrared thermal imaging module and tank car information shoot with video-corder module calculates the liquid level in tank body, specifically
For, comprise the following steps：
（1）The collection of thermal sensation image：This step completes collection by the infrared ray thermal inductance instrument being arranged in by rail, works as infrared ray thermal inductance
Instrument is received after the signal that signaling module in place sends, that is, start the collection that video data is carried out to tank body.
（2）Image semantic classification：The video data that infrared ray thermal inductance instrument is collected is needed to change into view data.Often save tank
Car can be set as needed by the amount of images of video extraction, according to multiple field experiment, it is found that four images can
Photographed most of tank body, so as to be conducive to next step to measure accurate liquid level data, therefore can default setting often save tank car extraction
Four images.
（3）Digital Image Processing：Using edge detection operator include：Sobel operators, Robert operators, Prewitt are calculated
Sub these three single order operators.The a plurality of liquid level line in a section tank body is detected by these three algorithms, single ballot is then carried out,
The measurement result of an optimum is drawn with statistical concept.Specifically, if detected by these three algorithms in a certain position
To there is border, just the position is added to possible liquid level line the inside.The method can integrate the pluses and minuses of algorithms of different, obtain
To optimal result.Finally by decision-makings such as color modes, which bar is liquid level line, and the device have chosen RGB/CMY color model
Different passages carry out image procossing, one line of demarcation closest to actual conditions of final choice come identify tank body up-and-down boundary and
Liquid level line of demarcation.
（4）What the tank car model in tank car image and front end recognition with reference to taken by tank car information shoots with video-corder module went out
Liquid level line of demarcation and the height ratio value of tank car up-and-down boundary, convert and obtain accurate actual liquid level height value, non-so as to realize
Contact tank car infra-red thermal imaging liquid level on-line checking.Specifically, because every kind of tank car geomery is fixed, height
Value is also fixed, therefore rail tanker data pre-input is entered into data processing module.Because infrared thermal sensation instrument installation site is fixed, because
This can be according to tank car height value itself and distance proportion, the height of the liquid level line of demarcation gone out with reference to front end recognition and tank car up-and-down boundary
Degree ratio value, conversion obtains actual liquid level height value.
The present embodiment is in the specific implementation：It is online to carry out that warning device, tape deck or other servicing units can be coordinated
Detection.Such as host computer the tank car actual liquid level height value that obtain of conversion and railway freight-car transporting can be specified in defined standard
Dress requirement for height upper lower limit value is compared, if exceeding prescribed limit, warning device then sends alarm, facilitates administrative staff to carry out
Next step is instructed, and reduces the generation of accident, while tape deck then records the license number of the tank car, for looking into for final-period management personnel
See.
Claims (6)
1. a kind of contactless tank car infrared thermal imaging liquid level online test method, for the tank car to traveling on railway
Interior liquid level is detected, it is characterised in that：The detection method is at least comprised the following steps：
Driving vehicle on the railway is judged, judges whether it is tank car, that is, carry out the detection in place of tank car；If sentencing
When the driving vehicle broken on the railway is tank car, the collection of infrared thermal imaging image is carried out to the tank body of the tank car；Root
According to the up-and-down boundary of tank car and liquid level line of demarcation described in the infrared thermal imaging image recognition；Calculate the upper following of the tank car
Boundary and the marginal height ratio value of liquid level, with reference to the model of the tank car, conversion obtains the reality in the tank body of the tank car
Border liquid level height value.
2. a kind of contactless tank car infrared thermal imaging liquid level online test method according to claim 1, it is special
Levy and be：The detection in place of the tank car realized by arranging two distance measuring sensors, two distance measuring sensors court respectively
To the differing heights position of the tank body, the relative distance between its installation site and the tank body is detected respectively, according to relative
Distance carries out the detection in place of tank car.
3. a kind of contactless tank car infrared thermal imaging liquid level online test method according to claim 2, it is special
Levy and be：Determine whether that vehicle passes through according to the output voltage size of the distance measuring sensor；Pass with reference to two range findings
The duration of difference and the difference between the output voltage of sensor judges whether the driving vehicle is tank car.
4. a kind of contactless tank car infrared thermal imaging liquid level online test method according to claim 1, it is special
Levy and be：The infrared thermal imaging image recognition by be respectively adopted Sobel operators, Robert operators, Prewitt operators this three
The a plurality of line of demarcation that algorithm is detected in the tank body is planted, then in conjunction with the testing result of three kinds of algorithms, this is met simultaneously
The line of demarcation of three kinds of algorithms, finally by color mode image procossing the up-and-down boundary and liquid level boundary of the tank car is obtained
Line.
5. a kind of contactless tank car infrared thermal imaging liquid level online test method according to claim 1, it is special
Levy and be：The model of the tank car in the railway side by arranging infrared imaging device realization, the infrared imaging
Device shoots the tank body, and the startup of the infrared imaging device is satisfied with the detection in place of Jing tank cars, judges the railway
On driving vehicle for tank car requirement.
6. a kind of contactless tank car infrared thermal imaging liquid level online test method according to claim 1, it is special
Levy and be：The model of the tank car in the railway side by arranging the realization of tank car information camera device, the tank car information
Camera device shoots the model of the tank car, and the detection in place of Jing tank cars is satisfied with the startup of the tank car information camera device,
Judge requirement of the driving vehicle on the railway for tank car.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611223269.1A CN106595809A (en) | 2016-12-27 | 2016-12-27 | Non-contact type infrared thermal imaging liquid level online detection method for railway tanker |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611223269.1A CN106595809A (en) | 2016-12-27 | 2016-12-27 | Non-contact type infrared thermal imaging liquid level online detection method for railway tanker |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109272480A (en) * | 2017-07-18 | 2019-01-25 | 杭州领克信息科技有限公司 | A kind of detection method in immiscible solution line of demarcation |
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Address after: No. 251 Tianmu East Road, Jingan District, Shanghai Applicant after: Institute of science and technology of China Railway Shanghai Bureau Group Co., Ltd. Address before: No. 251 Tianmu East Road, Zhabei District, Shanghai Applicant before: Science & Technology Inst., Shanghai Railway Bureau |
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| CB02 | Change of applicant information | ||
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Application publication date: 20170426 |
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| RJ01 | Rejection of invention patent application after publication |