CN205826070U - A kind of remote districts reservoir liquid level remote supervision system - Google Patents
A kind of remote districts reservoir liquid level remote supervision system Download PDFInfo
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- CN205826070U CN205826070U CN201620791114.7U CN201620791114U CN205826070U CN 205826070 U CN205826070 U CN 205826070U CN 201620791114 U CN201620791114 U CN 201620791114U CN 205826070 U CN205826070 U CN 205826070U
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- supervision system
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Abstract
A kind of remote districts reservoir liquid level remote supervision system, including single chip control module, drive module, amplification circuit module, ultrasound probe, current conversion module, wireless communication module, host computer, the outfan of described single chip control module is connected with ultrasound probe by driving module, ultrasound probe is connected with the input of single chip control module by amplification circuit module again, and then single chip control module is connected with current conversion module sets up the communication between host computer through wireless communication module；Also include that temperature detecting module, temperature detecting module are connected with the input of single chip control module.This utility model can solve remote reservoir and detect, because of the most unmanned, the problem that the reservoir liquid level superelevation brought causes reservoir to put forward absolutely.Coefficient of automation is high, and with strong points, and equipment safety is reliable, easy for installation.
Description
Technical field
This utility model relates to electronic technology field, particularly a kind of remote districts reservoir liquid level remote supervision system.
Background technology
Reservoir, as flood retention water-retention and the water conservancy structure of regulation current, can be used to irrigate, generate electricity, control flood and support
Fish.Especially in rural area, the effect of reservoir is very big to agricultural development benefit, is mainly reflected in the irrigation to agricultural.But according to mesh
Front understanding, the reservoir from far-off regions of a lot of precipitations often occurs that sudden and violent overflowing puies forward absolutely situation, and tracing it to its cause is due to reservoir zone position
In remote districts, often water level is measured by nobody, and the rainfall of big intensity ultimately results in dykes and dams collapse, causes and carries absolutely.For
This type of phenomenon, the commonly used method of current people is exactly periodically or non-periodically to check reservoir, but most people can
Can often forget or irresponsibility, may finally ultimately result in send out because of forgetting that sensed water level causes reservoir liquid level to rise
Raw matters of aggravation.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of remote districts reservoir liquid level remote supervision system, profit
Solve remote districts powerup issue by solar powered mode, measure liquid level height by using ultrasound probe to send ultrasound wave
Degree, is measured ambient temperature by temperature sensor simultaneously, carries out calculating ultrasonic measuring by internal system program
Liquid level calibrate, when system detect reservoir liquid level beyond the danger threshold of default, system will send sound
Sound is reported to the police, and detection data can pass to the host computer of Central Control Room by 4G communication and determine whether to determine simultaneously, remind and are correlated with
Staff's reservoir liquid level exceeds dangerous values, just reduction water level of taking measures on customs clearance, to guarantee reservoir safety.This utility model
Remote reservoir can be solved and detect, because of the most unmanned, the problem that the reservoir liquid level superelevation brought causes reservoir to put forward absolutely.Coefficient of automation
Height, and with strong points, and equipment safety is reliable, easy for installation.
For solving above-mentioned technical problem, this utility model be the technical scheme is that a kind of remote districts reservoir liquid level
Remote supervision system, it is characterised in that: include single chip control module, drive module, amplification circuit module, ultrasound probe,
Current conversion module, wireless communication module, host computer, the outfan of described single chip control module is by driving module with ultrasonic
Ripple probe connects, and ultrasound probe is connected with the input of single chip control module by amplification circuit module again, single-chip microcomputer control
Then molding block is connected with current conversion module sets up the communication between host computer through wireless communication module；Also include that temperature is examined
Surveying module, temperature detecting module is connected with the input of single chip control module.
Preferably, described driving module includes on-off circuit module, power amplifier module, high-frequency pulse transformer voltage liter
Die block, on-off circuit module is connected with power amplifier module, power amplification mould and high-frequency pulse transformer boost in voltage module
Connecting, high-frequency pulse transformer boost in voltage module is connected with ultrasound probe.
Preferably, described amplification circuit module includes one-level amplifying circuit, second amplifying circuit, three-stage amplifier, super
Sonic probe is connected with one-level amplifying circuit, and one-level amplifying circuit is connected with second amplifying circuit, second amplifying circuit and three grades
Amplifying circuit connects, and three-stage amplifier is connected with single chip control module.
Preferably, also include that solar powered module, described solar powered module include solar panel and plumbic acid
Accumulator.
Preferably, described solar powered module is connected with solar control module, and solar control module is filtered with voltage
Mode block connects, and voltage filter module is connected with voltage step-down module, and voltage step-down module is connected with single chip control module.
Preferably, described single chip control module is also connected with power down memory module.
Preferably, the input of described single chip control module is also connected with key-press module, described single chip control module
Outfan be also connected with alarm module and LCD MODULE.
Preferably, described host computer is PC, and described wireless communication module uses 4G communication module.
Preferably, described ultrasound probe launches downwards ultrasound wave with vertical direction.
Preferably, described solar panel employing two pieces is installed in parallel.
Using said structure, this utility model provides a kind of remote districts reservoir liquid level remote supervision system profit, uses the sun
Power supply mode can solve remote districts powerup issue, measure liquid level by using ultrasound probe to send ultrasound wave, with
Time by temperature sensor, ambient temperature is measured, carry out calculating the liquid level to ultrasonic measuring by internal system program
Highly calibrate, when system detects the reservoir liquid level danger threshold beyond default, and system will send audible alarm,
Detection data can pass to the host computer of Central Control Room by 4G communication and determine whether to determine simultaneously, prompting relevant staff
Reservoir liquid level exceeds dangerous values, just reduction water level of taking measures on customs clearance, to guarantee reservoir safety.This utility model can solve
The problem that the reservoir liquid level superelevation that remote reservoir brings because of the most unmanned detection causes reservoir to carry absolutely.Coefficient of automation is high, and
With strong points, equipment safety is reliable, easy for installation.
Accompanying drawing explanation
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings:
Fig. 1 is structural representation of the present utility model；
Fig. 2 is this utility model voltage filter modular circuit schematic diagram；
Fig. 3 is this utility model voltage step-down module circuit theory diagrams；
Fig. 4 is this utility model solar control modular circuit schematic diagram；
Fig. 5 is this utility model high-frequency pulse transformer boost in voltage modular circuit schematic diagram；
Fig. 6 is this utility model one-level amplification circuit diagram；
Fig. 7 is this utility model second amplifying circuit figure；
Fig. 8 is this utility model three-stage amplifier figure；
Fig. 9 is this utility model alarm module circuitry schematic diagram；
Figure 10 is this utility model temperature detecting module circuit theory diagrams.
Detailed description of the invention
As it is shown in figure 1, a kind of remote districts reservoir liquid level remote supervision system, it is characterised in that: include Single-chip Controlling
Module, driving module, amplification circuit module, ultrasound probe, current conversion module, wireless communication module, host computer, described list
The outfan of sheet machine control module is by driving module to be connected with ultrasound probe, and ultrasound probe passes through amplification circuit module again
Being connected with the input of single chip control module, single chip control module is connected then through radio communication mold with current conversion module
Block sets up the communication between host computer；Described current conversion module is mainly used to the liquid level height value detected by single-chip microcomputer
It is converted into current value to be sent to host computer and carry out level monitoring.Also include temperature detecting module, temperature detecting module and single-chip microcomputer
The input of control module connects.Described temperature detecting module uses the Temperature Humidity Sensor of DS18B20 model to gather environment temperature
Degree, the transmission speed temperature influence of sound wave, use temperature sensor to gather ambient temperature, ultrasound wave location system is carried out school
Accurate.Described single chip control module uses the single-chip microcomputer of MSP430F149 model as control core, and described single-chip microcomputer has super
Low-power consumption, steady operation and other merits.
Preferably, described driving module includes on-off circuit module, power amplifier module, high-frequency pulse transformer voltage liter
Die block, on-off circuit module is connected with power amplifier module, power amplification mould and high-frequency pulse transformer boost in voltage module
Connecting, high-frequency pulse transformer boost in voltage module is connected with ultrasound probe.Described on-off circuit module major function is logical
Crossing break-make is the alternating current that system forms about 15V, and described high-frequency pulse transformer boost in voltage module mainly comprises LC resonance
Circuit and 4:200 step-up transformer circuit, be mainly used to 15V voltage increase to 1500V for encouraging ultrasound probe to occur
Impulse wave.
Preferably, described amplification circuit module includes one-level amplifying circuit, second amplifying circuit, three-stage amplifier, super
Sonic probe is connected with one-level amplifying circuit, and one-level amplifying circuit is connected with second amplifying circuit, second amplifying circuit and three grades
Amplifying circuit connects, and three-stage amplifier is connected with single chip control module.Described one-level amplifying circuit major function is by institute
The small-signal received simply amplifies reduction, to facilitate the detection filter of next stage amplifying circuit；Put for described two grades
Big circuit major function is amplification further to signal and filtering, further facilitates single-chip microcomputer detection；Described three grades are amplified electricity
Road major function is the amplification that automatically adjusts signal, obtains a stable voltage signal, facilitates single-chip microcomputer to receive.
Preferably, also include that solar powered module, described solar powered module include solar panel and plumbic acid
Accumulator.
Preferably, described solar powered module is connected with solar control module, and solar control module is filtered with voltage
Mode block connects, and voltage filter module is connected with voltage step-down module, and voltage step-down module is connected with single chip control module.Institute
Stating solar control module uses driving chip CN3717 to be core, and described chip carries voltage detection module.
Preferably, described single chip control module is also connected with power down memory module.When system power failure, data preserve,
Described power down memory module uses FM24CL04 acp chip.
Preferably, the input of described single chip control module is also connected with key-press module, is used for inputting setting, described list
The outfan of sheet machine control module is also connected with alarm module and LCD MODULE.Described alarm module includes audible alarm
Device.Described LCD MODULE uses the liquid crystal display screen of LCD045 model, and data and systematic parameter thereof to collecting show.
Preferably, described host computer is PC, and described wireless communication module uses 4G communication module.Facilitate Single-chip Controlling
Carry out data transmission between core and host computer.
Preferably, described ultrasound probe launches downwards ultrasound wave with vertical direction.
Preferably, described solar panel employing two pieces is installed in parallel.
As in figure 2 it is shown, be this utility model solar powered module voltage filter circuit figure, it is ultrasonic for being mainly used to blood pressure lowering
Ripple detection module provides required voltage.Selecting output voltage in the present invention is the accumulator of 24V, so the power supply of power module
Voltage chooses 24V, and ultrasound examination module needs 5V altogether, the voltage of several form of 3.3V, 1.65V, so needing 24V voltage
Required voltage is down in blood pressure lowering filtering.Voltage first passes around the protective tube of a 500mA and intercepts the voltage signal more than 24V,
If voltage signal is the highest or far above 24V, protective tube directly blows, intercept passing through of voltage.Prevent from burning the core of rear class
Sheet, the purpose using IN4007 forward conduction diode and P6KE30CA schottky clamp diode is to prevent supply voltage
Reversal connection, if supply voltage both positive and negative polarity connects instead, voltage directly by the two diode flow back to power supply protects rear class electricity
Road.High and low frequency target signal filter in 24V voltage directly is fallen to obtain one and stablizes by the inductance of 470uH and the electric capacity of 470uF
24V unidirectional current.
As it is shown on figure 3, be this utility model solar powered module voltage reduction voltage circuit figure；The first step needs voltage drop
Voltage 15V needed for rear class pulse transformer, uses a 78M15 chip blood pressure lowering direct to 24V voltage, is down to required
15V.The electric capacity adding a 10uF is only needed to filter.Needed for second step needs 15V voltage is down to central die
3.3V voltage.Needing to add the clamp diode of an about 10V between two-stage, effect is that 15V voltage directly pours into chip
LM1117MPX-3.3 directly burning chip, so needing to get off the voltage drop of 15V, therefore choosing clamper two pole of 10V
15V voltage is down to about 5V by pipe.5V voltage flows through chip LM1117 is down to about 3.3V.3rd step is to be depressurized to by 3.3V
1.65V, but there is no direct blood pressure lowering chip, choose a comparator MAX4331 3.3V voltage differential is divided into half and be exactly
Required 1.65V voltage, is powered late-class circuit.
As shown in Figure 4, for this utility model solar powered module control circuit figure.Solar powered module is by solar energy
Cell panel, accumulator, CN3717 control circuit forms.Workflow: solar panel as the input stage of energy, for
CN3717 control circuit provides the input of electric energy, and control circuit is filled high efficiency for the electric energy collected to lead-acid accumulator again.
The effect of solar control circuit is the electricity gathering solar panel efficiently, then enters according to the state of accumulator electric-quantity
Row intelligent charge, solar control circuit makes the core control portions of solar powered module.Solar control circuit is to drive
Chip CN3717 is core, chip automatic voltage detection module, according to the electric quantity of lead-acid storage battery detected at trickle, and standard,
Under overcharge and four kinds of patterns of floating charging, choose corresponding pattern and accumulator is charged.This mode is to a certain extent
Extend flying power and the service life of accumulator.
As it is shown in figure 5, be this utility model high-frequency pulse transformer boost in voltage module circuit diagram；Excitation ultrasound examination
The voltage signal of module probe transmitting ultrasound wave downwards is about the high pressure of about 1500V, booster circuit to be designed.Circuit
Operation principle: P1 mouth constantly receives the PMW impulse wave of single-chip microcomputer transmitting makes NPN type triode Q1 constantly switch Guan Bi, when
Audion Q1 base input signal is 0, the when that i.e. audion being off.The colelctor electrode 15V voltage of audion Q1 flows into NPN
Type audion Q3 and the base stage of NPN type triode Q4, voltage signal makes NPN type triode Q3 be in open mode so that positive-negative-positive
Audion Q4 is off state, so now the 15V voltage of NPN type triode Q3 upper end flows directly into field effect transistor IRFZ34
Base stage in Q5, makes field effect transistor be closed now shaking to resistance R7 and electric capacity C4 of pulse booster transformer and produces
30V voltage.When the base input signal of audion Q1 is 1, now audion Q1 is in open mode, now audion Q1
The 15V voltage of colelctor electrode is flowed into digitally by the emitter stage of audion.Now NPN type triode Q3 and the audion of positive-negative-positive
The base signal of Q4 is 0, so audion Q3 and audion Q4 is in the state opened, the now letter of the base stage of field effect transistor Q5
Number it is 0, so now field effect transistor is in the state opened, resistance R7 and electric capacity C4 shakes the 30V voltage produced and directly flow
Entering ground, so the voltage now flowed in pulse transformer is about 0V, it is by Q3 that audion Q4 is in the reason of the state opened
The faint signal that emitter stage produces prevents the base stage on field effect transistor from producing impact with flowing into.The constantly switch of field effect transistor with
Guan Bi makes pulse booster two ends produce about 30V continually varying alternating voltage, the alternating voltage pulse boosting by 4:200
After device, referred about the 1500V of voltage, it is used for encouraging ultrasound probe to launch downwards impulse wave.
As shown in Figure 6, for this utility model one-level amplification circuit diagram, the echo-signal that probe receives is the faintest, now
Single-chip Controlling core is cannot to detect this signal, it is therefore desirable to is amplified the faint signal of telecommunication, is put by signal
It is filtered into greatly the receptible signal of telecommunication of single-chip microcomputer.One-level amplifying circuit is that received small-signal is done the amplification that a letter is answered
Reduction, to facilitate the detection filter of next stage amplifying circuit.
As it is shown in fig. 7, be this utility model second amplifying circuit figure, small voltage signal, after one-level is amplified, is exaggerated
Become be easy to detection voltage signal, but signal still suffers from a lot of noise signal and the peak value of voltage signal and signal intensity still
The faintest, so needing signal is further amplified and Filtering Processing, further facilitate the inspection of Single-chip Controlling core
Survey.
As shown in Figure 8, for this utility model three-stage amplifier figure, the electricity obtained after money two-stage circuit amplifies filtering
Pressure signal some peak-to-peak value possible is higher, and some peak-to-peak value is relatively low, puts so these voltage signals to be automatically adjusted by this level
Greatly, a stable voltage signal is obtained.By using array scalable potentiometer, by device control, constantly correcting
Magnification ratio relation, finally amplifies and a system required voltage signal value.
As it is shown in figure 9, warn the circuit theory diagrams of module for this utility model；When ultrasonic distance measuring module shows reservoir liquid level
When arranging danger threshold beyond system, system can send audible alarm automatically, reminds staff to take the measure of precipitation position with pre-
Accident prevention occurs.This module core is WT588D speech chip, uses three line SPI mode, passes through between single-chip microcomputer and WT588D
Article three, order wire connects, and is chip selection signal CS, data signal MISO and clock signal SCLK respectively, and it is logical that sequential follows standard SPI
Letter mode.Sent information by single-chip microcomputer WT588D is controlled, it is achieved speech chip order control, speech play.
As shown in Figure 10, for this utility model temperature sensor testing circuit figure；This utility model uses DS18B20 sensing
Device collecting temperature, this sensor has that volume is little, precision is high, measurement scope is wide, it is wider to be suitable for voltage, use one-wire bus, logical
The advantages such as letter mode is simple.As shown being the pinouts of DS18B20 sensor, its function is as follows: 1, DQ is numeral letter
Number input/output terminal；2, GND is power supply ground；3, VDD is that external power supply input (connects when the parasite power mode of connection
Ground)；DS18B20 sensor uses external power source power supply mode, is a kind of optimal mode, stable and reliable in work, anti-interference energy
Power is strong, and the advantage that can give full play to DS18B20 wide power voltage scope, even if supply voltage VCC drops to 3V, still can
Enough ensure temperature measurement accuracy.DS18B20 working power is accessed by VDD pin, and I/O line need not strong pull-up, there is not power supply
The problem that electric current is not enough.Now, the GND pin of DS18B20 can not be unsettled, otherwise can not inversion temperature, the temperature of reading is always
85℃。
Utility model works flow process: first provided 24V power supply by solar powered module for whole device, through power supply
Module carries out voltage filter, then by 24V voltage 15V voltage needed for reduction voltage circuit is down to pulse transformer, monolithic movement
Sheet 3.3V voltage, module reference voltage 1.65V is that each device of system is powered, and is then produced 50% dutycycle by MSP430F149
PWM ripple controls the alternating current of break-make formation about the 15V of on-off circuit module, is boosted by high-frequency pulse transformer module
Excitation ultrasound probe launches impulse wave, is amplified and filtering clutter for three times by amplification circuit module in the process, now single
Sheet machine starts timing, starts reflection after impulse wave runs into liquid level, and the waveform reflected is exaggerated circuit and amplifies back former ratio
Sending into single-chip microcomputer, now timing terminates.In simultaneity factor device, temperature compensation module gathers ambient temperature by temperature sensor,
By single-chip microcomputer inside programming, systematic parameter being made temperature correction, system calculates the height of liquid level according to internal processes, obtains
The liquid level height value that one progress is of a relatively high, and shown by the liquid crystal display screen data to collecting and systematic parameter thereof
Show, when exceeding the danger threshold that system pre-sets, audible alarm can be sent, remind relevant staff to take prevention to arrange
Execute.By current conversion module, height number is converted to current value be sent to host computer by 4G communication and enter simultaneously
Row is analyzed the most in real time.
The above embodiments are only optimal technical scheme of the present utility model, and are not construed as limit of the present utility model
System, the technical scheme that protection domain of the present utility model should be recorded with claim, the technical scheme recorded including claim
The equivalents of middle technical characteristic is protection domain.Equivalent the most in this range is improved, also at this utility model
Protection domain within.
Claims (10)
1. a reservoir liquid level remote supervision system from far-off regions, it is characterised in that: include single chip control module, drive mould
Block, amplification circuit module, ultrasound probe, current conversion module, wireless communication module, host computer, described Single-chip Controlling mould
The outfan of block is by driving module to be connected with ultrasound probe, and ultrasound probe is again by amplification circuit module and single-chip microcomputer control
The input of molding block connects, and then single chip control module is connected with current conversion module sets up with upper through wireless communication module
Communication between the machine of position；Also include that temperature detecting module, temperature detecting module are connected with the input of single chip control module.
A kind of remote districts reservoir liquid level remote supervision system, it is characterised in that: described driving mould
Block includes on-off circuit module, power amplifier module, high-frequency pulse transformer boost in voltage module, on-off circuit module and power
Amplification module connects, and power amplification mould is connected with high-frequency pulse transformer boost in voltage module, high-frequency pulse transformer voltage liter
Die block is connected with ultrasound probe.
A kind of remote districts reservoir liquid level remote supervision system, it is characterised in that: described amplification electricity
Road module includes one-level amplifying circuit, second amplifying circuit, three-stage amplifier, and ultrasound probe is with one-level amplifying circuit even
Connecing, one-level amplifying circuit is connected with second amplifying circuit, and second amplifying circuit is connected with three-stage amplifier, three-stage amplifier
It is connected with single chip control module.
A kind of remote districts reservoir liquid level remote supervision system, it is characterised in that: also include the sun
Energy supply module, described solar powered module includes solar panel and lead-acid accumulator.
A kind of remote districts reservoir liquid level remote supervision system, it is characterised in that: described solar energy
Supply module is connected with solar control module, and solar control module is connected with voltage filter module, voltage filter module with
Voltage step-down module connects, and voltage step-down module is connected with single chip control module.
A kind of remote districts reservoir liquid level remote supervision system, it is characterised in that: described single-chip microcomputer
Control module is also connected with power down memory module.
A kind of remote districts reservoir liquid level remote supervision system, it is characterised in that: described single-chip microcomputer
The input of control module is also connected with key-press module, the outfan of described single chip control module also with alarm module and liquid crystal
Display module connects.
A kind of remote districts reservoir liquid level remote supervision system, it is characterised in that: described host computer
For PC, described wireless communication module uses 4G communication module.
A kind of remote districts reservoir liquid level remote supervision system, it is characterised in that: described ultrasound wave
Probe launches downwards ultrasound wave with vertical direction.
A kind of remote districts reservoir liquid level remote supervision system, it is characterised in that: the described sun
Can cell panel employing two pieces be installed in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620791114.7U CN205826070U (en) | 2016-07-26 | 2016-07-26 | A kind of remote districts reservoir liquid level remote supervision system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620791114.7U CN205826070U (en) | 2016-07-26 | 2016-07-26 | A kind of remote districts reservoir liquid level remote supervision system |
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| Publication Number | Publication Date |
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| CN205826070U true CN205826070U (en) | 2016-12-21 |
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| CN201620791114.7U Expired - Fee Related CN205826070U (en) | 2016-07-26 | 2016-07-26 | A kind of remote districts reservoir liquid level remote supervision system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109297562A (en) * | 2018-11-12 | 2019-02-01 | 淮南矿业(集团)有限责任公司 | A kind of acousto-optic floodometer and measurement method |
| CN110006505A (en) * | 2019-02-21 | 2019-07-12 | 杭州美仪自动化有限公司 | A kind of ultrasonic level gage and its liquid-level detecting method |
| CN110849440A (en) * | 2019-12-03 | 2020-02-28 | 佛山金田申电子有限公司 | Liquid level detecting device for clamping pipe |
| CN111366212A (en) * | 2020-05-09 | 2020-07-03 | 河北省地质环境监测院 | Unattended underground water level detector |
-
2016
- 2016-07-26 CN CN201620791114.7U patent/CN205826070U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109297562A (en) * | 2018-11-12 | 2019-02-01 | 淮南矿业(集团)有限责任公司 | A kind of acousto-optic floodometer and measurement method |
| CN109297562B (en) * | 2018-11-12 | 2024-03-12 | 淮南矿业(集团)有限责任公司 | Acousto-optic water level measuring instrument and measuring method |
| CN110006505A (en) * | 2019-02-21 | 2019-07-12 | 杭州美仪自动化有限公司 | A kind of ultrasonic level gage and its liquid-level detecting method |
| CN110849440A (en) * | 2019-12-03 | 2020-02-28 | 佛山金田申电子有限公司 | Liquid level detecting device for clamping pipe |
| CN111366212A (en) * | 2020-05-09 | 2020-07-03 | 河北省地质环境监测院 | Unattended underground water level detector |
| CN111366212B (en) * | 2020-05-09 | 2021-09-07 | 河北省地质环境监测院 | Unattended underground water level detector |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161221 Termination date: 20170726 |
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| CF01 | Termination of patent right due to non-payment of annual fee |