CN108759985A - A kind of level monitoring system of the high-pressure sealed foamite container of ship's fire fighting - Google Patents
A kind of level monitoring system of the high-pressure sealed foamite container of ship's fire fighting Download PDFInfo
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- CN108759985A CN108759985A CN201810522582.8A CN201810522582A CN108759985A CN 108759985 A CN108759985 A CN 108759985A CN 201810522582 A CN201810522582 A CN 201810522582A CN 108759985 A CN108759985 A CN 108759985A
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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
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- Acoustics & Sound (AREA)
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- Thermal Sciences (AREA)
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Abstract
The present invention relates to a kind of level monitoring systems of the high-pressure sealed foamite container of ship's fire fighting, specifically, it is that a kind of liquid level by periodically monitoring foamite container detects whether it has normal extinguishing ability, while having a detection device of Real-time Liquid Level Measurement and data upload function.The present invention is by power supply monitoring module, control module, drive module, signal processing module, ultrasonic sensor and wireless module composition.The present invention can periodically monitor the liquid level of the high-pressure sealed foamite container of ship, and liquid level data is uploaded to extinguishment control system in real time by wireless module.Meanwhile the system also has the function of measuring extinguishing chemical liquid level in real time by bluetooth communication module.The advantage of the invention is that extending the function of extinguishment control system, its controlled level and reliability are improved, while having the function of to measure in real time so that crewman can irregularly spot-check detection liquid level, further ensure ship's fire fighting safety.
Description
Technical field
The present invention relates to ship's fire fighting control system fields, and in particular to a kind of high-pressure sealed foamite container of ship's fire fighting
Level monitoring system.
Background technology
To ensure the navigation safety at sea of ship, ship's fire fighting is always people's problem of concern, and modern ships are most
Equipped with automation fire extinguishing system, which includes mainly：Automatic control system and fire-extinguishing bottle.Wherein automatic control system
Implement the functions such as detection, alarm evacuation, extinguishing chemical release, fire-extinguishing bottle is for storing high pressure gas extinguishing chemical.Due to
Extinguishing chemical applicating frequency is very low, and the holding time is also very long, therefore usually has minor leakage, and this leakage is accumulated over a long period
Tank interior pressure can be caused to decline, extinguishing chemical is greatly decreased, and when may cause ship that fire occurs, can not normally put out a fire, prestige
Coerce ship and the safety of crewman.Therefore, a kind of level monitoring system of the high-pressure sealed foamite container of ship's fire fighting is designed, to expanding
The function of opening up fire extinguishing system, improves the controlled level of fire extinguishing system, further ensures that ship's fire fighting is of great significance safely.
China Patent Publication No. CN102974061A, publication date 2013.03.20, patent name are a kind of " modularization ship
The patent readme of oceangoing ship fire control system " is：" the present invention relates to a kind of ship's fire fighting control system based on modularized design,
Specifically, being a kind of function control system that signal monitoring processing function is packaged into submodule composition respectively.Packet of the present invention
Include power module, control module, input module, power module, wind oil module and display module, control module, input module, work(
Rate module, wind oil module and display module are connect with the power bus that power module controls, and all modules connect shape with CAN bus
At network, input module is connected with fire signal detection device, and power module is discharged with fire-suppressant gas applicator, training gas
Device, evacuation warning device, fire extinguishing discharge alarm and are connected, and wind oil module is connected with wind turbine, oil pump, display module and color liquid crystal
Screen, button, buzzer are connected ".The system can realize fire detection by input module and fire signal detection device, pass through
Power module discharges alarm and realizes fire extinguishing with fire-suppressant gas applicator, training gas applicator, evacuation warning device, fire extinguishing
Agent discharges and alarm evacuation function.Meanwhile all modules are connect to form network by the system with CAN bus, can be acquired in real time
With analysis current information, entire fire-fighting system reliability service is ensured.Its shortcoming is：The system lacks in foamite container
The detection function of fire-fighting dose.Therefore, crewman needs to regularly replace extinguishing chemical to ensure the normal use of fire extinguishing system, but this
Mode will certainly cause a large amount of wastes of extinguishing chemical, and being changed without extinguishing chemical can cause crewman that can not understand whether extinguishing chemical is deposited
It is revealing, can not judge whether extinguishing chemical is sufficient in container, extinguishing chemical is not when may cause ship that fire occurs, in container
Foot, can not normally implement to put out a fire.It can be seen that designing a kind of level monitoring system of the high-pressure sealed foamite container of ship's fire fighting
System, can effectively avoid the waste of extinguishing chemical and ensure the normal use of fire extinguishing system, and there is highly important reality to anticipate
Justice.The present invention detects whether it has normal extinguishing ability by periodically monitoring the liquid level of foamite container, has simultaneously
The detection device of Real-time Liquid Level Measurement and measurement data upload function.
Invention content
It can be combined with ship's fire fighting system the purpose of the present invention is to provide a kind of, periodically monitor foamite container liquid
Position, is provided simultaneously with the detecting system of Real-time Liquid Level Measurement and measurement data upload function；Also have for improving ship's fire fighting control
The function of system processed further increases its controlled level, ensures the reliability application of its fire-extinguishing function concurrently.
The present invention is achieved by the following technical solutions：
A kind of level monitoring system of the high-pressure sealed foamite container of ship's fire fighting, specifically includes power supply monitoring module, control
Molding block, drive module, signal processing module, ultrasonic sensor, wireless module, bluetooth communication module；Power supply monitoring module
Including power supply conversion and detection module and accumulator, power supply monitoring module and control module, drive module, signal processing mould
Block, ultrasonic sensor are connected and provide 24V and 5V DC voltages, and power supply conversion and detection module have electric quantity detection function,
Alarm signal is sent in low battery；Drive module includes signal conditioning circuit, power amplification circuit；Signal processing module packet
Include A/D conversion modules, signal conditioning circuit, signal amplification circuit；Ultrasonic sensor includes electroacoustic transducer and acoustic-electric transducing
Device；Bluetooth communication module sends initial parameter to wireless module and controls signal, is exported to control module after wireless module receives
Carry out level gauging work.
The control module specifically includes：
The signal of control module divides two-way to export, and is exported all the way to drive module, another way is exported to wireless module；Its
In, it exports to the signal of drive module and enters power amplification circuit after signal conditioning circuit is handled, finally enter ultrasonic sensing
Device module electroacoustic transducer；It is measurement data signals to export to the signal of wireless module, which is sent to by wireless module
Extinguishment control system or bluetooth communication module.
The wireless module specifically includes：
Wireless module is connected with control module；And wireless module, there are two types of pattern, one mode is that have to normally receive control
The operating mode of signal and emission measurement data-signal processed, another pattern are the controls sent by bluetooth communication module with reception
The suspend mode that the periodicity of signal processed automatically wakes up；The data are divided two-way to export by wireless module, all the way output to fire extinguishing control
System processed, another way are exported to bluetooth communication module.
The ultrasonic sensor specifically includes：
Input signal of the output signal of power amplification circuit as electroacoustic transducer, into electroacoustic transducer, electroacoustic turns
Parallel operation emits ultrasonic wave；Echo-signal is received by acoustic-electrical transducer and is converted to electric signal again, and the electric signal is by acoustic-electric transducing
Device is exported to signal processing module.
The signal processing module specifically includes：
Input signal of the electric signal of acoustic-electrical transducer output as signal amplification circuit, the output of signal amplification circuit are made
For the input of signal conditioning circuit, the input of the output of signal conditioning circuit as A/D conversion modules is defeated by A/D conversion modules
The signal gone out enters control module as the input signal of control module；The measurement data signals of signal processing module output are controlled
Molding block receives, and control module is to calculating actual measurement level value after measurement data signals processing and exporting to wireless module.
The beneficial effects of the present invention are：
The present invention can be sent control instruction by wireless transmission method and receive measurement data signals, and survey crew passes through
Hand-hold Bluetooth communication module can be completed the setting to measurement initial parameter and to the liquid level of the high-pressure sealed foamite container of ship
It measures, it is easy to use.Meanwhile it by the setting measurement period, can periodically be passed to fire extinguishing system in the state of lower power consumption
Defeated foamite container level value completes the permanently effective monitoring to foamite container liquid level.The system extends fire extinguishing system
Function improves its controlled level, is conducive to the normal use of extinguishing chemical, has further ensured ship's fire fighting safety.
Description of the drawings
Fig. 1 is the system construction drawing of the present invention.
Specific implementation mode
The present invention includes power supply monitoring module, control module, drive module, signal processing module, ultrasonic sensor, nothing
Wire module.Power supply monitoring module is used for control module, drive module, signal processing module, ultrasonic sensor provide 24V and
5V DC voltages.Control module sends control signal to drive module, which is converted to energy after the processing of drive module
The electric signal for enough driving ultrasonic sensor, drives sensor emission ultrasonic wave, carries out level gauging.Echo-signal is through ultrasonic wave
After sensor processing, electric signal is converted to again, which, which is exported by ultrasonic sensor to signal processing module, is known
Not and handle.The measurement data signals of signal processing module output are received by control module, and control module believes the measurement data
Actual measurement level value is calculated after number processing and is exported to wireless module.The data can be divided two-way to export by wireless module, defeated all the way
Go out to extinguishment control system, another way is exported to bluetooth communication module, for survey crew's real time inspection level value.In addition, bluetooth
Control signal also can be transmitted in communication module, is exported after wireless module receives to control module, and initial parameter is measured for being arranged
With progress level gauging work.The signal of control module divides two-way to export, and is exported all the way to drive module, another way is exported to nothing
Wire module.Wherein, the signal of output to drive module is used to control after processing sensor and carries out level gauging work, and output is extremely
The signal of wireless module is measurement data signals.Drive module includes mainly：Signal conditioning circuit and power amplification circuit.Control
Input of the output as signal conditioning circuit all the way of module, the output of signal conditioning circuit is as the defeated of power amplification circuit
Enter.The module can be modulated the control signal that control module is sent and power amplification, to drive ultrasonic sensor to send
Ultrasonic signal.Ultrasonic sensor includes mainly：Electroacoustic transducer and acoustic-electrical transducer.Wherein, power amplification circuit is defeated
Go out input signal of the signal as electroacoustic transducer, ultrasonic wave is emitted by electroacoustic transducer, carries out level gauging work.Echo is believed
Number by acoustic-electrical transducer receive and be converted to electric signal again, which is exported by acoustic-electrical transducer to signal processing module.
Signal processing module includes mainly：A/D conversion modules, signal conditioning circuit, signal amplification circuit.Wherein, acoustic-electrical transducer
Input signal of the output signal as signal amplification circuit, the input of signal amplification circuit exported as signal conditioning circuit,
Input of the output of signal conditioning circuit as A/D conversion modules, the signal exported by A/D conversion modules is as control module
Input signal.The module is converted to for being amplified, shaping pulse and being filtered the output signal of acoustic-electrical transducer
Digital signal is sent to control module and is handled and analyzed.Wireless module is connected with control module, the survey of control module output
Input signal of the data-signal as wireless module is measured, the control signal of wireless module output is believed as the input of control module
Number.Meanwhile the data-signal that wireless module is sent out can divide two-way to transmit, and be transmitted to extinguishment control system, another way all the way
It exports to wireless communication module.Power supply monitoring module includes mainly：Accumulator and power supply conversion and detection module.Accumulator is defeated
Go out direct current to power supply conversion and detection module, the direct current is converted into 24V and 5V direct currents by power supply conversion and detection module
Voltage, module, drive module, signal processing module and ultrasonic sensor provide direct current in order to control.
It is for a more detailed description to the present invention below in conjunction with the accompanying drawings：The present invention includes power supply monitoring module, and control module is driven
Dynamic model block, signal processing module, ultrasonic sensor, wireless module.Wherein, power supply monitoring module mainly include power supply conversion and
Detection module, accumulator；Drive module includes mainly signal conditioning circuit and power amplification circuit；Ultrasonic sensor includes electricity
Sonic transducer and acoustic-electrical transducer；Signal processing module includes mainly A/D conversion modules, signal condition electricity and signal amplification electricity
Road.The liquid level measuring system is mounted on the outside of foamite container, and bluetooth communication module is hand-held, and survey crew can profit
Real-time Liquid Level Measurement is carried out with the module.
Power supply monitoring module includes mainly：Accumulator, power supply conversion and detection module.Wherein, accumulator is straight for providing
Galvanic electricity pressure.The DC conversion that power supply is converted and detection module can export accumulator is turned into 5V and 24V DC voltages by power supply
It changes that module and ultrasonic sensor provide 24V voltages in order to control with detection module, is provided for drive module and signal processing module
5V voltages.Meanwhile power supply conversion and detection module have electric quantity detection function, and alarm signal is sent in low battery, remind
Crewman replaces accumulator in time.
Control module detailed functions are as follows：(1) control module sends control according to the measurement period of setting, periodic wakeup
Signal processed and reception measurement data signals, while measurement data is uploaded to extinguishment control system in real time, so that crewman checks；
(2) it is sent out the electric signal of certain frequency when control module is in wake-up working condition, is passed to ultrasonic wave by drive module
Sensor sends signal, and the electroacoustic transducer controlled in ultrasonic sensor emits ultrasonic beam, carries out level gauging；(3) it controls
Module receives the electric signal sent by sensor by signal processing module, according to the size of electric signal, with reference to liquid level and telecommunications
Number reduced value calculate actual measurement level value, the measurement data is uploaded by wireless module；(4) control module suspend mode
When, only timer internal is in wake-up states, and specific dormancy time can be set by bluetooth communication module.
Drive module, including signal conditioning circuit and power amplification circuit.Its function is mainly to export control module
Electric signal is handled, and enables to drive electroacoustic transducer.Particularly, signal conditioning circuit refers mainly to impulse modulation electricity
The pulse signal that control module is sent is handled by it, is allowed to meet the requirement of electroacoustic transducer by road.Power amplification circuit
Modulated signal is subjected to power amplification, enable to drive electroacoustic transducer and sends ultrasonic signal.
Signal processing module includes mainly A/D conversion modules, signal conditioning circuit, signal amplification circuit.At entire signal
Reason module can be handled the electric signal that acoustic-electrical transducer transmits, and make it possible to directly be read and analyzed by control module, tool
Body is described as follows：(1) A/D conversion modules, the voltage detected or current signal analog can be converted into control module can
The digital equivalent amount of identification, the digital quantity have corresponding correspondence with level value, can be obtained through control module calculation processing
Survey level value.(2) signal conditioning circuit includes mainly pulse shaper and bandwidth-limited circuit, and pulse shaper can
The unstable waveform signal transmitted by acoustic-electrical transducer is converted into satisfactory regular waveform signal, so as to subsequent signal
Analysis and processing.Since ultrasonic signal can be influenced by environment in practical measurement process, is received by acoustic-electrical transducer and passed
The waveform signal sent may include different frequency ranges, can be believed other frequency ranges unrelated with level gauging by bandwidth-limited circuit
Number removal, so that control module is identified and handles.(3) signal amplification circuit, the waveform for transmitting acoustic-electrical transducer
The amplitude of signal is amplified processing, and the small-signal that this process can be such that sensor receives is changed into the symbol that can be identified and handle
Desired signal is closed, and the process does not influence the measured value of foamite container liquid level.
Ultrasonic sensor, the part are mainly made of electroacoustic transducer and acoustic-electrical transducer.Wherein, electroacoustic transducer is used
In converting electrical signals to ultrasonic wave and emitting outward, level gauging is carried out；Acoustic-electrical transducer is used for receives echo-signal, and will
It is converted to electric signal, and being sent to control module by signal processing module carries out calculation processing, obtains level value.Ultrasonic wave passes
Sensor is using transmitting-receiving integrated, i.e., electroacoustic transducer and acoustic-electrical transducer are integrated on a ultrasonic probe.The sensor
The actual installation for the high-pressure sealed foamite container that coincidence measurement requires and sensor mounting location is in tank base requires.
Wireless module is for receiving control signal and sending measurement data signals.Detailed description are as follows：(1) wireless module
Consistent with control module wake-up period, when control module wakes up work, wireless module is received by synchronized wake-up by control module
The measurement data signals of transmission, and the data are uploaded to extinguishment control system.(2) in the rest period of control module, wireless mould
Block is in low power consumpting state, and the low power consumpting state refers to periodically automatically waking up, and has detected whether control signal, the letter
It number is sent by bluetooth communication module.If there is control signal, wake up at once, into normal operating conditions, carry out data receiver and
Work is sent, if without control signal, dormant state is immediately entered and next wake-up period is waited for be waken up again.(3) bluetooth is logical
News module is the control terminal that survey crew holds, and sends control signal to control module by wireless module, carries out liquid level survey
Work is measured, and is transferred data on the display screen of bluetooth communication module, is checked for survey crew.The bluetooth communication module
Concrete function is as follows；A. bluetooth communication module controls signal by transmission, can actively wake up control module, carries out periodical liquid
An independent level gauging except position measures works, and is convenient for crewman's foamite container liquid level check at any time；B. bluetooth communication mould
Block has display module, can show the level value of measurement, and remind survey crew when liquid level is less than warning liquid level；C. bluetooth
Communication module includes a control panel, for actively waking up control module and being configured to measuring initial parameter.
The course of work and operation principle of the present invention is as follows：
(1) power supply monitoring module provides direct current using accumulator for whole system, and survey crew is logical by hand-hold Bluetooth
Module is interrogated, control signal is sent to control module, the measurement period of the system and the initial parameter of measurement is set, and opening should
System is allowed in running order.(2) when system works, control module is in periodic wakeup state.For example, if setting measures
Period is one day, then control module can automatically wake up in specific time of the day, send a control signal to drive module.Drive mould
The signal that block sends control module carries out processing amplification, enables to drive electroacoustic transducer.Electroacoustic transducer is by electric signal
Mechanical wave, i.e. ultrasonic wave are converted to, and to external emission, ultrasonic wave is after liquid-gas interface reflects, and echo is by acoustic-electric transducing
Device receives.Acoustic signals are converted to electric signal by acoustic-electrical transducer, and send it to signal processing module.Signal processing module
Signal is amplified, shaping and filtering, digital signal is converted to after A/D module processings and is read by control module
It takes.For control module according to the electric signal size of reading, the reduced value of contrast signal size and liquid level can calculate actual measurement liquid level
Value, the measurement data are uploaded to extinguishment control system in time by wireless module.So far, a working cycles knot of the system
Beam, and enter dormant state, wait for next wake-up period to be waken up again.Operator can look on the display module of fire extinguishing system
See daily level measurement.(3) when the system in a dormant state when, i.e., be not waken up, wireless module can periodically
It automatically wakes up, which is much smaller than the wake-up period of level monitoring system, has detected whether to be sent by bluetooth communication module
Control signal.If so, then waking up control module at once, normal operating conditions is fed them into, carries out level gauging work, if
Nothing, then dormant state waits for next wake-up period to be waken up again at once.The function can make survey crew in system rest period
It can measure and check at any time foamite container level value, further ensure ship's fire fighting safety.
Claims (5)
1. a kind of level monitoring system of the high-pressure sealed foamite container of ship's fire fighting, specifically includes power supply monitoring module, control
Module, drive module, signal processing module, ultrasonic sensor, wireless module, bluetooth communication module；Power supply monitoring module packet
Include power supply conversion and detection module and accumulator, power supply monitoring module and control module, drive module, signal processing module,
Ultrasonic sensor is connected and provides 24V and 5V DC voltages, and power supply conversion and detection module have electric quantity detection function, in electricity
Alarm signal is sent when measuring too low；Drive module includes signal conditioning circuit, power amplification circuit；Signal processing module includes A/
D conversion modules, signal conditioning circuit, signal amplification circuit；Ultrasonic sensor includes electroacoustic transducer and acoustic-electrical transducer；It is blue
Tooth communication module sends initial parameter to wireless module and controls signal, and output to control module carries out liquid after wireless module receives
Position measures work.
2. a kind of level monitoring system of the high-pressure sealed foamite container of ship's fire fighting according to claim 1, feature
It is, the control module specifically includes：
The signal of control module divides two-way to export, and is exported all the way to drive module, another way is exported to wireless module；Wherein, defeated
Go out and enter power amplification circuit after signal conditioning circuit is handled to the signal of drive module, finally enters sonac module
Electroacoustic transducer；It is measurement data signals to export to the signal of wireless module, which is sent to fire extinguishing control by wireless module
System processed or bluetooth communication module.
3. a kind of level monitoring system of the high-pressure sealed foamite container of ship's fire fighting according to claim 1, feature
It is, the wireless module specifically includes：
Wireless module is connected with control module；And wireless module, there are two types of pattern, one mode is that have to normally receive control letter
Number and emission measurement data-signal operating mode, another pattern is with receiving the control letter sent by bluetooth communication module
Number the suspend mode that automatically wakes up of periodicity；The data are divided two-way to export by wireless module, all the way output to fire extinguishing control system
System, another way are exported to bluetooth communication module.
4. a kind of level monitoring system of the high-pressure sealed foamite container of ship's fire fighting according to claim 1, feature
It is, the ultrasonic sensor specifically includes：
Input signal of the output signal of power amplification circuit as electroacoustic transducer, into electroacoustic transducer, electroacoustic transducer
Emit ultrasonic wave；Echo-signal is received by acoustic-electrical transducer and is converted to electric signal again, and the electric signal is defeated by acoustic-electrical transducer
Go out to signal processing module.
5. a kind of level monitoring system of the high-pressure sealed foamite container of ship's fire fighting according to claim 1, feature
It is, the signal processing module specifically includes：
Input signal of the electric signal of acoustic-electrical transducer output as signal amplification circuit, the output of signal amplification circuit is as letter
The input of number modulate circuit, the input of the output of signal conditioning circuit as A/D conversion modules, is exported by A/D conversion modules
Signal enters control module as the input signal of control module；The measurement data signals of signal processing module output are controlled molding
Block receives, and control module is to calculating actual measurement level value after measurement data signals processing and exporting to wireless module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810340336 | 2018-04-17 | ||
| CN2018103403360 | 2018-04-17 |
Publications (1)
| Publication Number | Publication Date |
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| CN108759985A true CN108759985A (en) | 2018-11-06 |
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ID=64002809
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| CN201810522582.8A Pending CN108759985A (en) | 2018-04-17 | 2018-05-28 | A kind of level monitoring system of the high-pressure sealed foamite container of ship's fire fighting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113324616A (en) * | 2021-05-11 | 2021-08-31 | 哈尔滨工程大学 | Water level monitoring system and method based on image forming processing |
| CN113406196A (en) * | 2021-07-13 | 2021-09-17 | 广东飞达交通工程有限公司 | Wireless transmission system for ultrasonic detection of aqueous film-forming foam liquid tank |
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| CN106932055A (en) * | 2017-04-24 | 2017-07-07 | 深圳市电应普科技有限公司 | A kind of High Precision Automatic sampling calibration ultrasonic solution level monitoring system |
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| US7819003B2 (en) * | 2002-06-11 | 2010-10-26 | Intelligent Technologies International, Inc. | Remote monitoring of fluid storage tanks |
| CN102297713A (en) * | 2011-05-19 | 2011-12-28 | 江苏红光仪表厂有限公司 | Tank wall externally attached type wireless communication level meter |
| CN105043506A (en) * | 2015-06-02 | 2015-11-11 | 林聪� | Ultrasonic oil conservator oil level detector for power transformer |
| CN106932055A (en) * | 2017-04-24 | 2017-07-07 | 深圳市电应普科技有限公司 | A kind of High Precision Automatic sampling calibration ultrasonic solution level monitoring system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113324616A (en) * | 2021-05-11 | 2021-08-31 | 哈尔滨工程大学 | Water level monitoring system and method based on image forming processing |
| CN113406196A (en) * | 2021-07-13 | 2021-09-17 | 广东飞达交通工程有限公司 | Wireless transmission system for ultrasonic detection of aqueous film-forming foam liquid tank |
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Application publication date: 20181106 |
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