CN109813396A - High-precision magnetostriction electric water gauge - Google Patents
High-precision magnetostriction electric water gauge Download PDFInfo
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- CN109813396A CN109813396A CN201910224029.0A CN201910224029A CN109813396A CN 109813396 A CN109813396 A CN 109813396A CN 201910224029 A CN201910224029 A CN 201910224029A CN 109813396 A CN109813396 A CN 109813396A
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Abstract
High-precision magnetostriction electric water gauge of the present invention belongs to magnetostriction electric water gauge technical field；Technical problem to be solved are as follows: a kind of high-precision magnetostriction electric water gauge is provided；Solve the technical solution of technical problem use are as follows: including control device, the bottom of the control device extends downward with measuring staff, and floating ball is arranged on the body of rod of measuring staff, and floating ball can slide on the body of rod of measuring staff；Control device is internally provided with control circuit board and transmitter, and central controller is integrated in control circuit board, and data acquisition module is integrated on transmitter, is additionally provided with signal output port at the top of control device；Central controller is bi-directionally connected with data acquisition module, communication module respectively by conducting wire, and the communication module is connected by RS485 communication bus with monitoring server；Central controller is also connected with data memory module, and the power input of central controller is connected with power module；The present invention is applied to level gauging place.
Description
Technical field
High-precision magnetostriction electric water gauge of the present invention belongs to magnetostriction electric water gauge technical field.
Background technique
Electric water gauge used at present is mainly used in the water level monitoring of rivers and lakes, city small towns street, and principle is base
In the feedback of water gauge floating ball and the measurement data of respective sensor, it can achieve 2 millimeters of measurement accuracy；But in actual use,
To the measurement accuracy of electric water gauge, more stringent requirements are proposed, is only limitted to electric water gauge functionally no longer to extraneous water surface number
According to measuring, also require to carry out high-acruracy survey to the liquid level of liquid in industrial control device, sink, tank body；Industry at present
The liquid level sensor being arranged inside control device is easy by the factors interference effect measurement accuracy such as temperature, hydraulic, and uses magnetic
It causes electric water gauge that can overcome the defect, improves measurement accuracy.
Summary of the invention
The present invention is in order to overcome the deficiencies in the prior art, technical problem to be solved are as follows: provides a kind of high-precision
Spend magnetostriction electric water gauge；In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows: high-precision magnetostriction
Electric water gauge, including control device, the bottom of the control device extend downward with measuring staff, cover on the body of rod of the measuring staff
Equipped with floating ball, the floating ball can slide on the body of rod of measuring staff；
The control device is internally provided with control circuit board and transmitter, and central control is integrated in the control circuit board
Device is integrated with data acquisition module on the transmitter, is additionally provided with signal output port at the top of the control device；
The central controller is bi-directionally connected with data acquisition module, communication module respectively by conducting wire, and the communication module is logical
RS485 communication bus is crossed to be connected with monitoring server；
The central controller is also connected with data memory module, power input and the power module phase of the central controller
Even.
The chip that the central controller uses is control chip U1, the circuit structure of the central controller are as follows:
12 feet, 13 feet, 14 feet, 15 feet of the control chip U1 are connected with data acquisition module respectively；
7 feet for controlling chip U1 are simultaneously connected behind one end of connecting resistance R5, one end of crystal oscillator JZ1 with one end of capacitor C6,
One end phase after 8 feet and the other end of connecting resistance R5, the other end of crystal oscillator JZ1 of the control chip U1 with capacitor C10
Even, it is grounded after the other end of the other end shunt-wound capacitance C10 of the capacitor C6；
30 feet, 31 feet, 32 feet of the control chip U1 are connected with communication module respectively；
Control 1 foot of chip U1,2 feet, 9 feet, 10 feet, 11 feet, 23 feet, 24 feet, 25 feet, 26 feet respectively with data acquisition module
Block is connected；
29 feet of the control chip U1 are connected with chip reset end；
28 feet of the control chip U1 are connected with power module；
27 feet of the control chip U1 are connected with the signal output end of temperature sensor；
It is grounded after the 20 foot serial capacitance C5 of the control chip U1；
18 feet of the control chip U1 are connected with AVCC power supply.
The chip that the data acquisition module uses is control chip U2, the circuit structure of the data acquisition module are as follows:
24 feet, 11 feet, 9 feet, 10 feet of the control chip U2 are connected with the electromagnetic sensing output end of floating ball respectively；
1 foot of the control chip U2 is connected with the output end of crystal oscillator module Y1；
40 feet of the control chip U2 are connected with 1 foot of control chip U1；
41 feet of the control chip U2 are connected with 14 feet of control chip U1；
42 feet of the control chip U2 are connected with 15 feet of control chip U1；
2 feet of the control chip U2 are connected with 12 feet of control chip U1；
3 feet of the control chip U2 are connected with 13 feet of control chip U1；
4 feet, 17 feet, 25 feet of the control chip U2 are grounded after being connected with each other；
5 feet of the control chip U2 are connected with 23 feet of control chip U1；
6 feet of the control chip U2 are connected with 24 feet of control chip U1；
7 feet of the control chip U2 are connected with 25 feet of control chip U1；
8 feet of the control chip U2 are connected with 26 feet of control chip U1；
12 feet of the control chip U2 are connected with 2 feet of control chip U1；
13 feet of the control chip U2 are connected with 9 feet of control chip U1；
14 feet of the control chip U2 are connected with 10 feet of control chip U1；
16 feet of the control chip U2 are connected with 11 feet of control chip U1.
The chip that the communication module uses is communication chip U3, the circuit structure of the communication module are as follows:
1 foot of the communication chip U3 is connected with 30 feet of control chip U1；
2 feet of the communication chip U3 simultaneously connect 32 feet behind one end of 3 feet of communication chip U3, resistance R14 with control chip U1
It is connected, the other end ground connection of the resistance R14；
4 feet of the communication chip U3 are connected with 31 feet of control chip U1；
5 feet of the communication chip U3 are grounded；
6 feet, 7 feet of the communication chip U3 are connected with signal output port；
8 feet of the communication chip U3 connect VCC input power.
The chip that the power module uses is power chip U4, U5, the circuit structure of the power module are as follows:
1 foot of the power chip U4 and the one end for connecing 2 feet of power chip U4,5 feet, 6 feet, capacitor C15, there is electrode capacitance C7's
It is connected after anode with power control terminal；
It is connected behind 3 feet of the power chip U4 and one end of connecting resistance R4 with the collector of triode Q1, the triode Q1
Emitter ground connection, be connected after the base stage series resistor R6 of the triode Q1 with central controller；
It is connected after 4 feet of the power chip U4 and the other end of connecting resistance R4 with 3V power output end；
, there are electrode capacitance C17 in 1 foot of the power chip U5 and the one end for connecing 2 feet of power chip U4,5 feet, 6 feet, capacitor C16
Anode after be connected with power control terminal；
It is connected behind 3 feet of the power chip U5 and one end of connecting resistance R9 with the collector of triode Q2, the triode Q2
Emitter ground connection, be connected after the base stage series resistor R10 of the triode Q2 with central controller；
It is connected after 4 feet of the power chip U5 and the other end of connecting resistance R9 with 3.3V power output end.
The model ATMEGA168PA of the control chip U1；
The model XC9572XL of the control chip U2；
The model SP3485EN of the communication chip U3；
The model NTGS4111P of described power chip U4, U5.
What the present invention had compared with the existing technology has the beneficial effect that magnetostriction electric water gauge provided by the invention is base
In the high-precision liquid level measuring device of magnetostriction principle manufacture, structure is carried out on the basis of existing electric water gauge structure and is changed
Into, the steel wire being arranged in floating ball is thinner, while to inside control device data acquisition and processing module carry out upgrading,
It can be made higher in industrial control device internal measurement level accuracy, faster, anti-interference ability is stronger for response speed, after transformation
Electric water gauge measurement accuracy can achieve 0.2 millimeter；With conductive rubber displacement sensor, magnetic grid displacement sensor, resistance-type
The liquid level emasuring devices such as displacement sensor are compared, the configuration of the present invention is simple, and installation and debugging are convenient, exempt from periodic maintenance and calibration, are fitted
With the accurate measurement to various liquid levels, it can not only install outdoors for monitoring water level, apply also for Dam Safety Detection, bridge
Beam modification, meteorological evaporation capacity monitoring, petrochemical system, thermal power plant, medicine bioengineering preparation, brewing industry, sewage disposal system, water
The level gauging in the fields such as Wenshui resource.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawing:
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is electrical block diagram of the invention；
Fig. 3 is the circuit diagram of central controller of the present invention；
Fig. 4 is the circuit diagram of data acquisition module of the present invention；
Fig. 5 is the circuit diagram of communication module of the present invention；
Fig. 6 is the circuit diagram of power module of the present invention；
In figure: 1 being control device, 2 be measuring staff, 3 be floating ball, 4 be central controller, 5 be data acquisition module, 6 be that signal is defeated
Exit port, 7 be communication module, 8 be monitoring server, 9 be data memory module, 10 be power module.
Specific embodiment
As shown in Figures 1 to 6, high-precision magnetostriction electric water gauge of the present invention, including control device 1, the control dress
The bottom for setting 1 extends downward with measuring staff 2, floating ball 3 is arranged on the body of rod of the measuring staff 2, the floating ball 3 can be in measuring staff
It is slided on 2 body of rod；
The control device 1 is internally provided with control circuit board and transmitter, and central control is integrated in the control circuit board
Device 4 processed is integrated with data acquisition module 5 on the transmitter, and the top of the control device 1 is additionally provided with signal output port
6；
The central controller 4 is bi-directionally connected with data acquisition module 5, communication module 7 respectively by conducting wire, the communication module
7 are connected by RS485 communication bus with monitoring server 8；
The central controller 4 is also connected with data memory module 9, the power input and power supply mould of the central controller 4
Block 10 is connected.
The chip that the central controller 4 uses is control chip U1, the circuit structure of the central controller 4 are as follows:
12 feet, 13 feet, 14 feet, 15 feet of the control chip U1 are connected with data acquisition module 5 respectively；
7 feet for controlling chip U1 are simultaneously connected behind one end of connecting resistance R5, one end of crystal oscillator JZ1 with one end of capacitor C6,
One end phase after 8 feet and the other end of connecting resistance R5, the other end of crystal oscillator JZ1 of the control chip U1 with capacitor C10
Even, it is grounded after the other end of the other end shunt-wound capacitance C10 of the capacitor C6；
30 feet, 31 feet, 32 feet of the control chip U1 are connected with communication module 7 respectively；
Control 1 foot of chip U1,2 feet, 9 feet, 10 feet, 11 feet, 23 feet, 24 feet, 25 feet, 26 feet respectively with data acquisition module
Block 5 is connected；
29 feet of the control chip U1 are connected with chip reset end；
28 feet of the control chip U1 are connected with power module 10；
27 feet of the control chip U1 are connected with the signal output end of temperature sensor；
It is grounded after the 20 foot serial capacitance C5 of the control chip U1；
18 feet of the control chip U1 are connected with AVCC power supply.
The chip that the data acquisition module 5 uses is control chip U2, the circuit structure of the data acquisition module 5
Are as follows:
24 feet, 11 feet, 9 feet, 10 feet of the control chip U2 are connected with the electromagnetic sensing output end of floating ball 3 respectively；
1 foot of the control chip U2 is connected with the output end of crystal oscillator module Y1；
40 feet of the control chip U2 are connected with 1 foot of control chip U1；
41 feet of the control chip U2 are connected with 14 feet of control chip U1；
42 feet of the control chip U2 are connected with 15 feet of control chip U1；
2 feet of the control chip U2 are connected with 12 feet of control chip U1；
3 feet of the control chip U2 are connected with 13 feet of control chip U1；
4 feet, 17 feet, 25 feet of the control chip U2 are grounded after being connected with each other；
5 feet of the control chip U2 are connected with 23 feet of control chip U1；
6 feet of the control chip U2 are connected with 24 feet of control chip U1；
7 feet of the control chip U2 are connected with 25 feet of control chip U1；
8 feet of the control chip U2 are connected with 26 feet of control chip U1；
12 feet of the control chip U2 are connected with 2 feet of control chip U1；
13 feet of the control chip U2 are connected with 9 feet of control chip U1；
14 feet of the control chip U2 are connected with 10 feet of control chip U1；
16 feet of the control chip U2 are connected with 11 feet of control chip U1.
The chip that the communication module 7 uses is communication chip U3, the circuit structure of the communication module 7 are as follows:
1 foot of the communication chip U3 is connected with 30 feet of control chip U1；
2 feet of the communication chip U3 simultaneously connect 32 feet behind one end of 3 feet of communication chip U3, resistance R14 with control chip U1
It is connected, the other end ground connection of the resistance R14；
4 feet of the communication chip U3 are connected with 31 feet of control chip U1；
5 feet of the communication chip U3 are grounded；
6 feet, 7 feet of the communication chip U3 are connected with signal output port 6；
8 feet of the communication chip U3 connect VCC input power.
The chip that the power module 10 uses is power chip U4, U5, the circuit structure of the power module 10 are as follows:
1 foot of the power chip U4 and the one end for connecing 2 feet of power chip U4,5 feet, 6 feet, capacitor C15, there is electrode capacitance C7's
It is connected after anode with power control terminal；
It is connected behind 3 feet of the power chip U4 and one end of connecting resistance R4 with the collector of triode Q1, the triode Q1
Emitter ground connection, be connected after the base stage series resistor R6 of the triode Q1 with central controller 4；
It is connected after 4 feet of the power chip U4 and the other end of connecting resistance R4 with 3V power output end；
, there are electrode capacitance C17 in 1 foot of the power chip U5 and the one end for connecing 2 feet of power chip U4,5 feet, 6 feet, capacitor C16
Anode after be connected with power control terminal；
It is connected behind 3 feet of the power chip U5 and one end of connecting resistance R9 with the collector of triode Q2, the triode Q2
Emitter ground connection, be connected after the base stage series resistor R10 of the triode Q2 with central controller 4；
It is connected after 4 feet of the power chip U5 and the other end of connecting resistance R9 with 3.3V power output end.
The model ATMEGA168PA of the control chip U1；
The model XC9572XL of the control chip U2；
The model SP3485EN of the communication chip U3；
The model NTGS4111P of described power chip U4, U5.
The present invention is mainly made of control device shell, the non-contacting magnet ring, that is, floating ball of measuring staff and set on the measuring rod, institute
It states and is provided with magnetostriction line in measuring staff；Basic principle are as follows: an initial pulse signal is sent out by central controller, this
When initial pulse signal transmits in magnetostriction line, while the rotating excitation field advanced along line stretcher direction is produced, when this
When permanent-magnetic field in a magnetic field and floating ball magnet ring meets, magnetostrictive effect is generated, line stretcher is twisted, generates twisting
Pulse signal, this twisting pulse signal are perceived the Shi Neng mechanism i.e. data acquisition module being installed in control device,
And convert thereof into corresponding current impulse, by central controller be calculated two pulse signals starting return between when
Between it is poor, can accurately measure current page altitude information and height displacement situation.
The present invention is to improve measurement accuracy, CPLD partial circuit has been installed additional on the circuit of existing electric water gauge, as number
It according to acquisition module, can make to be increased to 100MHz by original 8MHz to the sampling rate of pulse signal, be surveyed than existing electric water gauge
Accuracy of measurement improves 10 times or so, and precision can reach 0.1 millimeter；
The operation principle of the present invention is that: inquiry current impulse is sent out by control chip U1 first, the current impulse is along survey
Magnetostrictive waveguide silk in bar sensing probe transmits downwards, and the current impulse of sending will generate a belt magnetic field, sense
It is provided with corresponding floating ball outside probe, is suspended on the liquid level of variation and waves up and down with fluid change；One group is provided in floating ball forever
Magnet, and generate a magnetic field, when the inquiry current impulse magnetic field of sending along waveguide filament transmit and with floating ball magnetic field interaction
When, " distortion " pulse or " return " pulse are generated on waveguide filament, which are received by control chip U2, and will
It feeds back to control chip U1, and central controller calculates floating according to the interval time of " return " pulse and inquiry current impulse
The physical location of ball, to accurately measure liquid level numerical value.
When specifically used, the present invention is powered by power chip U4 and U5 to analog circuit by control chip U1, then
Commencing signal is sent by control chip U1 and gives control chip U2, analog circuit is sent stimulus signals to by control chip U2, by mould
Intend circuit and issue driving pulse to measuring staff, then measuring staff returns to " returning to pulse " to analog circuit, and analog circuit is to return pulse
Signal carries out signal processing, then will treated that signal is sent to that control chip U2 is further processed, then will processing knot
Fruit data return to control chip U1, while controlling chip U1 acquisition ambient temperature value, in the central controller do data into one
After the filtering of step, processing, calculating, temperature-compensating, the height value that precision reaches 0.1mm is finally obtained, and pass through communication chip U3
It is sent to monitoring server.
The present invention is circumscribed with communication port simultaneously, and connection can be established with extraneous monitoring server, and Real-time Feedback monitors number
According to, external server can also according to actual needs, built-in corresponding control software, so that it is had data analysis shows that, danger early warning
Etc. functions, the communication chip U3 communication port be specially RS485 protocol port, have transmission speed it is fast, the corresponding time is short, hold
The advantages such as error rate is low.
High-precision electronic water gauge performance indicator provided by the invention is as follows: water level measurement accuracy is ± 0.1mm, and resolution ratio is
0.03mm uses communication protocol for RS485 cable port, communications protocol Modbus-RTU, and the range that measures the temperature of a liquid is -10 DEG C
To 60 DEG C (not under icing condition), level gauging range is 0-1000mm, and internal module power supply specification is 6-12V direct current
Electricity, power consumption parameter: being less than 80mA when sampling, is less than 5mA when communication, and when sleep is less than 3mA；The present invention has high-precision, Gao Wen
The measurement of qualitative, high reliability, non-contact measurement, long service life, low in energy consumption, polling rate is fast, and response sensitivity is high, lightning protection
It hits, anti-radio frequency interference.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (6)
1. high-precision magnetostriction electric water gauge, it is characterised in that: including control device (1), the bottom of the control device (1)
It extends downward with measuring staff (2), is arranged with floating ball (3) on the body of rod of the measuring staff (2), the floating ball (3) can be in measuring staff
(2) it is slided on the body of rod；
The control device (1) is internally provided with control circuit board and transmitter, is integrated with center in the control circuit board
Controller (4) is integrated with data acquisition module (5) on the transmitter, is additionally provided with signal at the top of the control device (1)
Output port (6)；
The central controller (4) is bi-directionally connected with data acquisition module (5), communication module (7) respectively by conducting wire, described logical
Letter module (7) is connected by RS485 communication bus with monitoring server (8)；
The central controller (4) is also connected with data memory module (9), the power input of the central controller (4) with
Power module (10) is connected.
2. high-precision magnetostriction electric water gauge according to claim 1, it is characterised in that: the central controller (4)
The chip used is control chip U1, the circuit structure of the central controller (4) are as follows:
12 feet, 13 feet, 14 feet, 15 feet of the control chip U1 are connected with data acquisition module (5) respectively；
7 feet for controlling chip U1 are simultaneously connected behind one end of connecting resistance R5, one end of crystal oscillator JZ1 with one end of capacitor C6,
One end phase after 8 feet and the other end of connecting resistance R5, the other end of crystal oscillator JZ1 of the control chip U1 with capacitor C10
Even, it is grounded after the other end of the other end shunt-wound capacitance C10 of the capacitor C6；
30 feet, 31 feet, 32 feet of the control chip U1 are connected with communication module (7) respectively；
Control 1 foot of chip U1,2 feet, 9 feet, 10 feet, 11 feet, 23 feet, 24 feet, 25 feet, 26 feet respectively with data acquisition module
Block (5) is connected；
29 feet of the control chip U1 are connected with chip reset end；
28 feet of the control chip U1 are connected with power module (10)；
27 feet of the control chip U1 are connected with the signal output end of temperature sensor；
It is grounded after the 20 foot serial capacitance C5 of the control chip U1；
18 feet of the control chip U1 are connected with AVCC power supply.
3. high-precision magnetostriction electric water gauge according to claim 2, it is characterised in that: the data acquisition module
(5) chip used is control chip U2, the circuit structure of the data acquisition module (5) are as follows:
24 feet, 11 feet, 9 feet, 10 feet of the control chip U2 are connected with the electromagnetic sensing output end of floating ball (3) respectively；
1 foot of the control chip U2 is connected with the output end of crystal oscillator module Y1；
40 feet of the control chip U2 are connected with 1 foot of control chip U1；
41 feet of the control chip U2 are connected with 14 feet of control chip U1；
42 feet of the control chip U2 are connected with 15 feet of control chip U1；
2 feet of the control chip U2 are connected with 12 feet of control chip U1；
3 feet of the control chip U2 are connected with 13 feet of control chip U1；
4 feet, 17 feet, 25 feet of the control chip U2 are grounded after being connected with each other；
5 feet of the control chip U2 are connected with 23 feet of control chip U1；
6 feet of the control chip U2 are connected with 24 feet of control chip U1；
7 feet of the control chip U2 are connected with 25 feet of control chip U1；
8 feet of the control chip U2 are connected with 26 feet of control chip U1；
12 feet of the control chip U2 are connected with 2 feet of control chip U1；
13 feet of the control chip U2 are connected with 9 feet of control chip U1；
14 feet of the control chip U2 are connected with 10 feet of control chip U1；
16 feet of the control chip U2 are connected with 11 feet of control chip U1.
4. high-precision magnetostriction electric water gauge according to claim 3, it is characterised in that: the communication module (7) makes
Chip is communication chip U3, the circuit structure of the communication module (7) are as follows:
1 foot of the communication chip U3 is connected with 30 feet of control chip U1；
2 feet of the communication chip U3 simultaneously connect 32 feet behind one end of 3 feet of communication chip U3, resistance R14 with control chip U1
It is connected, the other end ground connection of the resistance R14；
4 feet of the communication chip U3 are connected with 31 feet of control chip U1；
5 feet of the communication chip U3 are grounded；
6 feet, 7 feet of the communication chip U3 are connected with signal output port (6)；
8 feet of the communication chip U3 connect VCC input power.
5. high-precision magnetostriction electric water gauge according to claim 4, it is characterised in that: the power module (10) makes
Chip is power chip U4, U5, the circuit structure of the power module (10) are as follows:
1 foot of the power chip U4 and the one end for connecing 2 feet of power chip U4,5 feet, 6 feet, capacitor C15, there is electrode capacitance C7's
It is connected after anode with power control terminal；
It is connected behind 3 feet of the power chip U4 and one end of connecting resistance R4 with the collector of triode Q1, the triode Q1
Emitter ground connection, be connected after the base stage series resistor R6 of the triode Q1 with central controller (4)；
It is connected after 4 feet of the power chip U4 and the other end of connecting resistance R4 with 3V power output end；
, there are electrode capacitance C17 in 1 foot of the power chip U5 and the one end for connecing 2 feet of power chip U4,5 feet, 6 feet, capacitor C16
Anode after be connected with power control terminal；
It is connected behind 3 feet of the power chip U5 and one end of connecting resistance R9 with the collector of triode Q2, the triode Q2
Emitter ground connection, be connected after the base stage series resistor R10 of the triode Q2 with central controller (4)；
It is connected after 4 feet of the power chip U5 and the other end of connecting resistance R9 with 3.3V power output end.
6. high-precision magnetostriction electric water gauge according to claim 5, it is characterised in that: the type of the control chip U1
Number be ATMEGA168PA；
The model XC9572XL of the control chip U2；
The model SP3485EN of the communication chip U3；
The model NTGS4111P of described power chip U4, U5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910224029.0A CN109813396A (en) | 2019-03-22 | 2019-03-22 | High-precision magnetostriction electric water gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910224029.0A CN109813396A (en) | 2019-03-22 | 2019-03-22 | High-precision magnetostriction electric water gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109813396A true CN109813396A (en) | 2019-05-28 |
Family
ID=66610062
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910224029.0A Pending CN109813396A (en) | 2019-03-22 | 2019-03-22 | High-precision magnetostriction electric water gauge |
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| CN (1) | CN109813396A (en) |
Cited By (2)
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