CN110260949A - A kind of intelligent ship ullage wireless supervisory control system and its method - Google Patents
A kind of intelligent ship ullage wireless supervisory control system and its method Download PDFInfo
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- CN110260949A CN110260949A CN201910677222.XA CN201910677222A CN110260949A CN 110260949 A CN110260949 A CN 110260949A CN 201910677222 A CN201910677222 A CN 201910677222A CN 110260949 A CN110260949 A CN 110260949A
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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
- G01F23/296—Acoustic waves
- G01F23/2962—Measuring transit time of reflected waves
-
- 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
- G01F23/80—Arrangements for signal processing
- G01F23/802—Particular electronic circuits for digital processing equipment
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Acoustics & Sound (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a kind of intelligent ship oil mass wireless supervisory control system and its methods, which includes: the ultrasonic level gage positioned at marine hydraulic hold top, for reducing the waveguide pipe of interference echo, wireless relay module, central computer and data center on the bank；When work, ultrasonic level gage emits ultrasonic wave to liquid level, ultrasonic wave is back to ultrasonic level gage after reaching liquid level, it is according to the transmitting and received time interval of self record, the conversion for carrying out liquid level information, then reaches central computer by wireless relay module in a manner of serial signal for the liquid level information of conversion, the liquid level information is handled, recorded by central computer, ullage information is obtained, then ullage information is sent into ashore data center and is stored.Its advantage is that: ultrasonic level gage, waveguide pipe etc. are combined, a kind of intelligent ship oil mass wireless supervisory control system is constructed, has pushed the development of intelligent cabin, also intelligently navigation provides a more convenient and fast mode for ship.
Description
Technical field
The present invention relates to electronics and field of communication technology, and in particular to a kind of intelligent ship ullage wireless supervisory control system
And its method.
Background technique
Ship intelligence has become the inexorable trend of shipbuilding and shipping field development, and China Classification Society (CCS) is based on
Domestic and international intelligent ship application experience and the developing direction of the following ship formulated " intelligent ship specification " in 2015, proposed intelligence
Energy ship function can be divided into intelligent navigation, intelligent hull, intelligent cabin, intelligent energy efficiency management, intelligent material handling and intelligent collection
At platform, wherein intelligent cabin occupies important one seat in the design of ship overall intelligenceization always.With scientific skill
The rapid development of art, new equipment and ship intelligence system mentality of designing emerge one after another, and cabin intelligence almost has become
" standard configuration " of modern ships.
But in actual work, the liquid level operating condition inside marine hydraulic hold such as fuel oil storage tank is sufficiently complex, fuel
Physical characteristic not only changes with the place of production, but also also has great relationship with weather；Meanwhile the pressure change in tank, the water diffused
Steam, various oil base class volatilization gas also have a huge impact the accuracy of level gauging, in addition, ship produces under steam
Raw jolting also can generate some adverse effects to the level gauging inside fuel oil storage tank.
It is usually all the liquid level of liquid tank to be tested using ultrasonic echo range measurement principle, but because ultrasonic wave is scattering
Wave, ultrasonic probe have certain field angle, and when compared with low liquid level, liquid level area becomes smaller, and exposes coil pipe and the lacing wire of pasta
There is very strong echo reflection to ultrasonic wave, so that ultrasonic level gage reading be made to generate biggish error.
Under normal conditions, the mobility under normal temperature state of the liquid in fuel oil storage tank is poor, is not easy to extract, pumping unit exists
When oil pumping, crude oil need to be heated to reduce its viscosity, to obtain good mobility, reduce oil-pumping resistance.Therefore oil
Become the interference source that should not be overlooked to vapor in tank, when vapor is gathered in below ultrasonic probe, liquidometer it is defeated
The generation of " virtual height " phenomenon, while the lower volatilization substance of boiling point in tank, the flue gas formed due to heating are often had out
Also apparent interference can be generated to level sensing.
Summary of the invention
The purpose of the present invention is to provide a kind of intelligent ship ullage wireless supervisory control system and its method, present invention benefits
With ultrasonic echo range measurement principle, by ultrasonic level gage, waveguide pipe, wireless relay module, central computer and data on the bank
Center combines, and the liquid level information that ultrasonic level gage measures is sent to ship central computer by wireless relay module,
To be further transmitted to data center on the bank；Wherein, ultrasonic level gage mainly passes through processing ultrasonic pulse and issues, and encounters
Time difference after liquid level returns is high to measure liquid, and the liquid level information that wireless relay module is responsible for measure is sent to scheming in ship
Management software in calculation machine, ship central computer management software be responsible for the data being collected into are handled, record and into
One step sends land-based data center for processed information and records, intelligent ship ullage wireless monitor of the invention
System has pushed the development of intelligent cabin, and also for ship, intelligently navigation provides a more convenient and fast mode.
In order to achieve the above object, the invention is realized by the following technical scheme: a kind of intelligent ship ullage is wireless
Monitoring system includes:
Ultrasonic level gage emits ultrasonic wave to liquid level, ultrasonic wave returns after reaching liquid level positioned at the ullage of liquid tank
It is back to the ultrasonic level gage, the ultrasonic level gage is carried out according to the transmitting and received time interval of self record
The conversion of liquid level information is simultaneously issued in a manner of serial signal；
For reducing the waveguide pipe of interference echo, it is set in the ultrasonic level gage lower end；
Wireless relay module receives the serial signal that the ultrasonic level gage issues；
Central computer is located at outside liquid tank, receives the serial signal that the wireless relay module issues and is handled, remembered
Record, obtains ullage information；
Data center on the bank receives the ullage information that the central computer issues, by the ullage information
Record storage；
The waveguide pipe is a rigidity, inner wall smooth cylinder, and internal diameter is greater than the ultrasonic transducer diameter,
Close to the height of liquid tank, upper end is welded on the flange to match with liquid tank riser length, and minimum liquid level or less is submerged in lower end；
The waveguide pipe is double waveguide structures, and double waveguide structures are that spindle guide together is packed into an outside waveguide pipe
Wave duct, the outside waveguide pipe is concordant with the coaxial waveguide pipe upper end, and coaxial guided wave length of tube is less than outside waveguide pipe.
Preferably, the ultrasonic level gage includes:
The ultrasonic transducer for converting electrical signals into acoustical signal emits ultrasonic wave to liquid level, after ultrasonic wave reaches liquid level
It is back to the ultrasonic transducer；
Controller is connect with the ultrasonic transducer, is recorded the ultrasonic transducer transmitting and is received ultrasonic wave
Time interval, the controller carry out the conversion of liquid level information and by it according to time interval information and cabin temperature information with string
The mode of row signal issues.
Preferably, the ultrasonic transducer includes:
It converts electrical signals to the piezoelectric transducer of acoustical signal and receives the transceiver of the acoustical signal；
The transceiver includes:
Ultrasonic wave transmitted pulse width control circuit receives the acoustical signal that the piezoelectric transducer transmits, by the acoustical signal
Emitted in the form of ultrasonic wave to liquid level, ultrasonic wave reaches an echo-signal detection electricity of the transceiver after liquid level returns
Road；
Echo-signal detecting circuit receives the ultrasonic wave returned through liquid level；
Signal processing circuit is connect with the echo-signal detecting circuit, and the echo-signal detecting circuit is received
Ultrasonic wave amplifies, compares, differential, forms sharp pulse signal in the d type flip flop of the controller, which triggers through D
Device shaping obtains the burst pulse jumped under one, and the burst pulse passes to the single chip microcomputer of the controller；
The single chip microcomputer is recorded super by the ultrasonic wave transmitted pulse width control circuit and echo-signal detecting circuit
Sound wave transmitting and received time interval carry out the conversion of liquid level information, and by the liquid level information of conversion in a manner of serial signal
It issues.
Preferably, the ultrasonic transducer also includes the temperature-compensation circuit for reducing temperature influence；
The electronic component of the temperature-compensation circuit includes a thermistor.
Preferably, the wireless relay module includes:
Slave part is located at close to cargo tank position, receives the serial signal that the ultrasonic level gage transmits, will be described
Serial signal transfer gives the host machine part；
Host machine part is located at close to the central computer position, receives the serial signal that the slave part is transmitted,
The serial signal is sent to the central computer.
Preferably, the ultrasonic level gage is placed in the geometric center position of liquid tank plane.
Preferably, a method of it is monitored using the intelligent ship ullage wireless supervisory control system, it is specific to wrap
Containing following steps:
S1, the ultrasonic transducer convert the electrical signal to acoustical signal, by the acoustical signal in the form of ultrasonic wave to
Liquid level is sent, and ultrasonic wave is back to the ultrasonic transducer by liquid level, and the controller record emits and receive ultrasonic wave
Time interval carries out the conversion of liquid level information in conjunction with the temperature-compensation circuit；
The liquid level information is transmitted to wireless relay module by S2, the ultrasonic level gage in a manner of serial signal, by
The wireless relay module is transmitted to the central computer；
Received serial signal is handled, is recorded by S3, the central computer, obtains ullage information；
S4, the processing center on the bank carry out record storage to the information that the central computer transmits.
Preferably, the method for the liquid level information conversion are as follows:
Liquid level distance is calculated by formula L=C × T/2, wherein L is ultrasonic level gage away from liquid level distance, and C is ambient sound
Speed, T are ultrasonic transmission time T；
Wherein, by the temperature-compensating formula of the velocity of sound: the environment velocity of sound=331.5+0.6 × environment temperature obtains current ring
Border velocity of sound C.
Compared with the prior art, the present invention has the following advantages:
(1) intelligent ship ullage wireless supervisory control system of the invention, by ultrasonic level gage, waveguide pipe, it is wireless in
After module, central computer and on the bank data center combines, and realizes cabin intelligence, has pushed the development of intelligent cabin,
Also for ship, intelligently navigation provides a more convenient and fast mode；
(2) intelligent ship ullage wireless supervisory control system of the invention, uses waveguide structure, so that ultrasonic wave can only
It propagates and reflects in pipe, greatly reduce the interference of unwanted echo, simultaneously because waveguide pipe relative closure, also to a certain degree
On prevented steam and interfered to " virtual height " caused by ultrasonic level gage, further increase the accuracy of liquid level information measurement；
(3) intelligent ship ullage wireless supervisory control system of the invention can pass through the intensity or reduction of raising ultrasonic wave
The power of ultrasonic transducer enhances the accuracy of ultrasonic echo ranging, increases the accuracy of liquid level information measurement.
Detailed description of the invention
Fig. 1 is the entire block diagram of intelligent ship oil mass wireless supervisory control system of the invention；
Fig. 2 is ultrasonic level gage working principle diagram of the invention；
Fig. 3 is waveguide pipe schematic diagram of the invention；
Fig. 4 is the surface chart of central computer management software of the invention.
Specific embodiment
The present invention is further elaborated by the way that a preferable specific embodiment is described in detail below in conjunction with attached drawing.
As shown in Figure 1, being a kind of entire block diagram of intelligent ship oil mass wireless supervisory control system of the invention, the device packet
Contain: the ultrasonic level gage positioned at marine hydraulic hold top is set in the ultrasonic level gage lower end for reducing interference echo
Waveguide pipe, wireless relay module, central computer outside cargo tank and on the bank data center.
When work, the ultrasonic level gage emits high-frequency impulse sound wave, that is, ultrasonic wave to liquid level, and ultrasonic wave reaches liquid level
After be back to the ultrasonic level gage, the ultrasonic level gage according to the transmitting and received time interval of self record,
The conversion for carrying out liquid level information, is then reached the liquid level information of conversion in a manner of serial signal by the wireless relay module
The liquid level information is handled, is recorded by the central computer, the central computer, obtains ullage information, with
The ullage information is sent into ashore data center afterwards and carries out record storage.
In the present embodiment, the ultrasonic level gage length is about 10 centimeters, it includes: the ultrasonic waves of transceiver
It can device (i.e. ultrasonic probe) and controller.
As shown in Fig. 2, being ultrasonic level gage working principle diagram.During the work time, the ultrasonic transducer will be electric
Signal is converted to acoustical signal, emits ultrasonic wave to liquid level, ultrasonic wave is back to the ultrasonic transducer after reaching liquid level, with institute
State ultrasonic transducer connection the controller record transmitting and receive ultrasonic wave time interval, the controller according to when
Between interval information and cabin temperature information carry out the conversion of liquid level information.
Wherein, the ultrasonic transducer includes: piezoelectric transducer, transceiver and the temperature for reducing temperature influence
Compensation circuit.The controller includes: the single chip microcomputer of d type flip flop and the chip containing 80C552.The single chip microcomputer is mainly responsible for
The transmitting of ultrasonic wave, the calculating for receiving ultrasonic echo time interval and conversion of liquid level etc..
The transceiver includes: ultrasonic wave transmitted pulse width control circuit, echo-signal detecting circuit and signal processing electricity
Road.Because temperature also has an impact to sound propagation velocity, therefore temperature-compensation circuit is provided with to reduce the influence of temperature, the temperature
The electronic component for spending compensation circuit includes a thermistor.
The piezoelectric transducer converts electrical signals to acoustical signal, by the ultrasonic wave transmitted pulse width control circuit of transceiver
The acoustical signal of conversion is emitted in the form of ultrasonic wave to liquid level, ultrasonic wave reaches the echo of the transceiver after liquid level returns
Signal demodulator circuit, the echo-signal detecting circuit are inputted ultrasonic wave by the end In (input terminal), pass through signal processing circuit
Ultrasonic wave is amplified, is compared, differential, forms sharp pulse signal at the end R of the d type flip flop, the sharp pulse signal is through d type flip flop
Shaping obtains the burst pulse jumped under one, and the burst pulse passes to the end INT (input terminal) of the single chip microcomputer.
The interruption system of the single chip microcomputer records the ultrasonic wave transmitted pulse width control circuit and echo letter of the transceiver
The time interval of the interruption adjacent twice of number detecting circuit is to get to transmitting to the time interval for receiving ultrasonic wave, by described
Time interval and the information of temperature-compensation circuit carry out the conversion of liquid level information, and by the liquid level information of conversion with serial signal
Mode issues.Wherein, by the relationship of sonic transmissions distance L (i.e. away from liquid level distance) and environment velocity of sound C and ultrasonic transmission time T
Formula L=C × T/2 calculates liquid level distance.What be should be noted is that temperature in liquid tank is higher, by the temperature-compensating formula of the velocity of sound:
The environment velocity of sound=331.5+0.6 × environment temperature obtains current environment velocity of sound C.
As shown in figure 3, being the waveguide pipe schematic diagram of the present embodiment.Waveguide pipe is a rigidity, the very smooth circle of inner wall
Cylinder, internal diameter are greater than ultrasonic transducer diameter.The length of waveguide pipe close to oil tank diameter, upper end be welded with oil tank riser
On the flange of matching, minimum liquid level (ship fuel tank parameter) following 5-10cm is submerged in lower end.The utilization of waveguide pipe, so that ultrasonic wave
It can only propagate and reflect in pipe, greatly reduce the interference of unwanted echo, simultaneously because waveguide pipe relative closure, also certain
Prevent steam in degree to interfere to " virtual height " caused by ultrasonic level gage.
In order to solve the problems, such as wall built-up of the crude oil in waveguide pipe in actual measurement, double waveguide structures, knot can also be used
Structure is that a relatively thin, shorter coaxial waveguide pipe is packed into big waveguide pipe, and the upper end of two pipes is concordant, and the length of small waveguide pipe is very
Short, the other end does not submerge crude oil liquid level, and the fixed some asbestos of filling in two-tube interlayer, for absorbing clutter.
In the present embodiment, RS485 of the 80C522 chip controls output containing liquid level information of ultrasonic level gage serially believes
Number.Due to cargo tank apart from ship central computer farther out, ultrasonic level gage and the communication of ship central computer use wireless
The mode of transmission, carrier frequency 433MHz, the frequency point is without application, and the wireless relay inside modules of the application are using professional radio frequency core
Piece, and PHASE-LOCKED LOOP PLL TECHNIQUE has been incorporated, sensitivity is high, and open field theoretical transmission distance is up to 1.2km, and agreement is using mark
Quasi- communication protocol is not necessarily to quadratic programming, only need to simply be arranged and can put into operation.
Specifically, the wireless relay module of the application includes slave part and host machine part.The slave part is located at oil
Cabin neighbouring position, receives the serial signal that ultrasonic level gage transmits, and gives the serial signal transfer to the host machine part；Institute
It states host machine part and is located at the central computer neighbouring position, the serial signal that the slave part is transmitted is received, by the string
Row signal is sent to the central computer.
The slave part includes: using S3C44BOX as the control of the slave of core and processing center and using nRF401 as core
Wireless serial data transfer module, slave control and processing center mainly complete control and the brief data of entire slave system
Processing, by from the RS485 serial signal that ultrasonic level gage 80C552 is obtained after coded treatment appropriate, by inside it
SIO module be sent to nRF401 module (wireless serial data transfer module).NRF401 module is mainly completed to host machine part
The transmitting of serial signal, nRF401 module have the dedicated core of data serial transmission that is highly integrated and being applied to 433MHz frequency range
Piece is widely used in serial transmission field, which only needs minimal amount of peripheral chip that can complete data
Transmitting.In addition to this, nRF401 module also passes the data information received back S3C44BOX module (in slave control and processing
The heart) it is handled.
Host machine part mainly includes the RF receiving and transmission module almost the same with slave part (with the receipts of nRF401 serial signal
Hair module is core) and receive signal processing module (using S3C44BOX as core).It receives signal processing module and receives slave portion
Divide the serial signal transmitted, passes to central computer through RF receiving and transmission module.RF receiving and transmission module needs to connect by UART simultaneously
Mouth is connected with central computer computer room, and RS-485 translation interface mainly provides level conversion function, turns by RS-485 interface
Data after changing pass central computer back again, and central computer is analyzed and handled to serial signal again, and setting is corresponding
Control command.
Entire wireless relay module uses modularized design scheme, sends and receives part in host machine part and slave part
It is transmitted using synchronous serial.When host machine part and central computer computer room carry out data transmission using standardized serial communication bus
For RS-485 as data transmission standard, entire wireless relay module all uses standard communication protocol, consequently facilitating and other systems
Carry out interconnected communication.
Ship central computer receives the serial signal that wireless relay module transmits, and internal management software is responsible for receipts
The serial signal collected is handled, is recorded, and the plus-minus of oil mass is controlled with obtained liquid level information, as shown in figure 4, for this
The surface chart of the central computer management software of application can be seen by this interface and record the letter of the liquid level in real-time cargo tank
Breath, and can control the plus-minus of cargo tank oil mass.Meanwhile ship central computer also further sends bank for processed information
Upper data center carries out record storage.
In order to realize the real time monitoring of oil mass, the top for needing to measure under sail, and being generated during ship running
Winnowing with a dustpan, it is unstable to will lead to cargo tank liquid level.In order to reduce measurement error as far as possible, i.e., reduce the floating of cargo tank liquid level as far as possible, preferably
Ultrasonic level gage can be placed in the geometric center position of cargo tank plane by ground.
In general, ultrasonic wave is propagated in the medium, and energy will reduce with the increase of distance, and this phenomenon is known as
The decaying of ultrasonic wave.There are mainly two types of situations for the decaying of ultrasonic wave, and one is acoustic beams itself to spread, and makes the energy on unit area
Decline is ultrasonic reflections or scattering as a result, preventing energy from surpassing in this case further along original direction propagation
The gross energy of sound wave is not reduced.Another situation is that, due to the absorption of medium, sound can be converted into ultrasonic wave propagation
For thermal energy, thus sound is enable to reduce, the mechanism of such situation is more complicated, mainly have it is viscous absorb, relaxation absorbs, relative motion
It absorbs and cavitation bubble absorbs.
For the ultrasonic wave of given frequency, intensity and pressure amplitude all with the increase of distance and exponentially under
Drop, may be expressed as:
Intensity function I (x)=I0e-2αx
Pressure amplitude P (P0)=P0e-2αx
Wherein, α is attenuation constant, and α is the function of frequency: α=β * f0, f0For frequency, β is the medium coefficient of viscosity.
Liquid level in cargo tank is not very tranquil, and sometimes also with flue gas, ultrasonic attenuation at this time is bigger, therefore certain
The sound intensity be liquid level accurately measures in cargo tank premise, not so the ultrasonic wave sound intensity is too weak, and the ultrasonic echo of return may be because
Overdamping and ultrasonic level gage can not be reached.Because attenuation constant is largely dependent upon frequency, therefore, we can be adopted
It is tested with the method for increasing ultrasonic frequency.
But if the power of ultrasonic transducer is greatly lowered, together on the basis of guaranteeing low liquid level gauging sensitivity
When reduce receiving sensitivity, can also accurately measure liquid level information.In this case, the intensity of interference echo is made to compare ultrasonic waves
The energy identifiable threshold value of device is much lower, and the echo identified in this way by ultrasonic level gage can only be just useful echo, i.e., liquid level returns
Wave, at this point, the accuracy rate of applying ultrasonic lever meter to measure also will increase.
In conclusion a kind of intelligent ship oil mass wireless supervisory control system of the invention, by ultrasonic level gage, waveguide pipe,
Wireless relay module, central computer and data center combines on the bank, realize cabin intelligence, and the application of waveguide pipe into
One step increases the accuracy of liquid level information measurement, and the appearance of intelligent ship oil mass wireless supervisory control system has pushed intelligent cabin
Development, also for ship intelligently navigation provide a more convenient and fast mode.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (8)
1. a kind of intelligent ship ullage wireless supervisory control system, characterized by comprising:
Ultrasonic level gage emits ultrasonic wave to liquid level, ultrasonic wave is back to after reaching liquid level positioned at the ullage of liquid tank
The ultrasonic level gage, the ultrasonic level gage carry out liquid level according to the transmitting and received time interval of self record
The conversion of information is simultaneously issued in a manner of serial signal；
For reducing the waveguide pipe of interference echo, it is set in the ultrasonic level gage lower end；
Wireless relay module receives the serial signal that the ultrasonic level gage issues；
Central computer is located at outside liquid tank, receives the serial signal that the wireless relay module issues and is handled, recorded,
Obtain ullage information；
Data center on the bank receives the ullage information that the central computer issues, the ullage information is recorded
Storage；
The waveguide pipe is a rigidity, inner wall smooth cylinder, and internal diameter is greater than the ultrasonic transducer diameter, length
Close to the height of liquid tank, upper end is welded on the flange to match with liquid tank riser, and minimum liquid level or less is submerged in lower end；
The waveguide pipe is double waveguide structures, and double waveguide structures are that spindle guide wave together is packed into an outside waveguide pipe
Pipe, the outside waveguide pipe is concordant with the coaxial waveguide pipe upper end, and coaxial guided wave length of tube is less than outside waveguide pipe.
2. intelligent ship ullage wireless supervisory control system as described in claim 1, which is characterized in that the supersonic liquid level
Meter includes:
The ultrasonic transducer for converting electrical signals into acoustical signal emits ultrasonic wave to liquid level, and ultrasonic wave returns after reaching liquid level
To the ultrasonic transducer；
Controller is connect with the ultrasonic transducer, is recorded the ultrasonic transducer transmitting and is received the time of ultrasonic wave
Interval, the controller carry out the conversion of liquid level information and by it according to time interval information and cabin temperature information serially to believe
Number mode issue.
3. intelligent ship ullage wireless supervisory control system as claimed in claim 2, which is characterized in that the ultrasonic wave transducer
Device includes:
It converts electrical signals to the piezoelectric transducer of acoustical signal and receives the transceiver of the acoustical signal；
The transceiver includes:
Ultrasonic wave transmitted pulse width control circuit receives the acoustical signal that the piezoelectric transducer transmits, by the acoustical signal with super
The form of sound wave emits to liquid level, and ultrasonic wave reaches an echo-signal detecting circuit of the transceiver after liquid level returns；
Echo-signal detecting circuit receives the ultrasonic wave returned through liquid level；
Signal processing circuit is connect with the echo-signal detecting circuit, by the received ultrasound of echo-signal detecting circuit
Wave amplifies, compares, differential, forms sharp pulse signal in the d type flip flop of the controller, the sharp pulse signal is whole through d type flip flop
Shape obtains the burst pulse jumped under one, and the burst pulse passes to the single chip microcomputer of the controller；
The ultrasonic wave that the single chip microcomputer is recorded by the ultrasonic wave transmitted pulse width control circuit and echo-signal detecting circuit
Transmitting and received time interval carry out the conversion of liquid level information, and the liquid level information of conversion is sent out in a manner of serial signal
Out.
4. intelligent ship ullage wireless supervisory control system as claimed in claim 2 or claim 3, which is characterized in that
The ultrasonic transducer also includes the temperature-compensation circuit for reducing temperature influence；
The electronic component of the temperature-compensation circuit includes a thermistor.
5. intelligent ship ullage wireless supervisory control system as described in claim 1, which is characterized in that the wireless relay mould
Block includes:
Slave part is located at close to cargo tank position, receives the serial signal that the ultrasonic level gage transmits, will be described serial
Signal is transferred to the host machine part；
Host machine part is located at close to the central computer position, the serial signal that the slave part is transmitted is received, by institute
It states serial signal and is sent to the central computer.
6. intelligent ship ullage wireless supervisory control system as described in claim 1, which is characterized in that
The ultrasonic level gage is placed in the geometric center position of liquid tank plane.
7. a kind of method that the intelligent ship ullage wireless supervisory control system using as described in claim 1~6 is monitored,
It is characterized in that, specifically including the following steps:
S1, the ultrasonic transducer convert the electrical signal to acoustical signal, by the acoustical signal to liquid level in the form of ultrasonic wave
It sends, ultrasonic wave is back to the ultrasonic transducer, the controller record transmitting and the time for receiving ultrasonic wave by liquid level
Interval carries out the conversion of liquid level information in conjunction with the temperature-compensation circuit；
The liquid level information is transmitted to wireless relay module by S2, the ultrasonic level gage in a manner of serial signal, by described
Wireless relay module is transmitted to the central computer；
Received serial signal is handled, is recorded by S3, the central computer, obtains ullage information；
S4, the processing center on the bank carry out record storage to the information that the central computer transmits.
8. the method that intelligent ship ullage wireless supervisory control system as claimed in claim 7 is monitored, which is characterized in that
The method of the liquid level information conversion are as follows:
Liquid level distance is calculated by formula L=C × T/2, wherein L is ultrasonic level gage away from liquid level distance, and C is the environment velocity of sound, T
For ultrasonic transmission time T；
Wherein, by the temperature-compensating formula of the velocity of sound: the environment velocity of sound=331.5+0.6 × environment temperature obtains current ambient sound
Fast C.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112284481A (en) * | 2020-10-29 | 2021-01-29 | 重庆运点点物流科技有限公司 | Fuel quantity monitoring system and method for ship oil tank |
| CN112556613A (en) * | 2020-11-30 | 2021-03-26 | 中国科学院武汉岩土力学研究所 | Tunnel structure convergence deformation monitoring system and method based on ultrasonic radar |
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| CN112284481B (en) * | 2020-10-29 | 2024-06-11 | 重庆运点点物流科技有限公司 | Fuel oil quantity monitoring system and method for ship oil tank |
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