CN202599971U - Liquid flow rate measuring device based on resistance strain gage - Google Patents
Liquid flow rate measuring device based on resistance strain gage Download PDFInfo
- Publication number
- CN202599971U CN202599971U CN 201220174927 CN201220174927U CN202599971U CN 202599971 U CN202599971 U CN 202599971U CN 201220174927 CN201220174927 CN 201220174927 CN 201220174927 U CN201220174927 U CN 201220174927U CN 202599971 U CN202599971 U CN 202599971U
- Authority
- CN
- China
- Prior art keywords
- signal
- module
- flow rate
- strain
- keyswitch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Measuring Volume Flow (AREA)
Abstract
The utility model discloses a liquid flow rate measuring device based on a resistance strain gage, which belongs to the measuring technical field. The liquid flow rate measuring device is structured in the following manners: a signal measuring module, a signal amplifying module, a signal processing module and a signal display module are sequentially connected in series; and the signal measuring module, the signal amplifying module, the signal processing module and the signal display module are all arranged in a sealed box. The liquid flow rate measuring device of the utility model is advantageous in that the liquid flow rate measuring device realizes the functions of measurement, storage and display of a flow rate simultaneously. Compared with the prior art, the problem that a liquid flow rate measuring device based on a resistance strain gage in the prior art can be only installed in a fixed manner, and can not be applied to underwater mobile devices can be overcome. The liquid flow rate measuring device based on the resistance strain gage provided by the utility model can satisfy the needs of underwater mobile devices such as an underwater robot and an underwater weapon and flow rate measurement in hydrological work.
Description
Technical field
The utility model belongs to field of measuring techniques, particularly a kind of flow rate of liquid measurement mechanism based on strain ga(u)ge.
Background technology
Flow rate of liquid is the important parameter of industrial processes.In order to satisfy the needs of measuring flow rate of liquid under the various operating modes; People have researched and developed the instrument that tests the speed based on different principle, for example Pitot tube knotmeter, LDV, particle imaging knotmeter, time difference method ultrasonic velocity meter, supersonic Doppler knotmeter, electric wave knotmeter, strain knotmeter etc.
The strain knotmeter is a kind of non-electricity measure instrument.Its measuring principle is to let fluid promote the flexible member distortion produce strain; Thereby drive the foil gauge deformation together that is pasted on flexible member; Convert fluid mechanical energy to electric weight through making up Wheatstone bridge then; Faint electric weight after will changing again carries out analyzing and processing through amplifying the electric signal relevant with flow velocity with the filtering extraction, thereby realizes the fluid velocity measurement.The strain knotmeter has the convection cell flow field and disturbs the transparency little, stream field to require low, advantages of small volume, easy to carry, cost performance advantages of higher.At document " research of paper pulp streaming process medium velocity distribution determination method " (Liu Huanbin; Zhou Qingle; Lan Futang, Lu Qianhe. the research [J] of paper pulp streaming process medium velocity distribution determination method, Guangdong paper technology communication; The Z1 phase in 1980) in, a kind of flow rate measuring device based on strain ga(u)ge to the paper pulp course of conveying has been proposed.The paper pulp course of conveying is in fixing pipeline, to accomplish, and this device can't be applied to needs and measure the measurement of the low flow velocity of open water in the occasion such as mobile device and hydrlolgic work in the water such as robot or underawater ordnance in the water of flow velocity.
The utility model content
The utility model discloses a kind of flow rate of liquid measurement mechanism based on strain ga(u)ge to above-mentioned defective; Realize measurement, storage and the Presentation Function of flow velocity simultaneously, can solve in the water the low fluid-velocity survey problem in mobile device in the water such as robot, underawater ordnance and the hydrlolgic work.
A kind of structure of the flow rate of liquid measurement mechanism based on strain ga(u)ge is following: signal measurement module, signal amplification module, signal processing module and signal display module are connected in series successively, and signal measurement module, signal amplification module, signal processing module and signal display module are installed in the seal box.
The structure of said signal measurement module is following: the positive pole of direct supply connects strain resistor; Negative pole connects first resistance; One end of output voltage connects the common node of strain resistor and thermo-compensator; The other end connects the common node of first resistance and second resistance, and the GND earth potential connects the common node of the thermo-compensator and second resistance.
The voltage of said direct supply is 5V.
Said signal amplification module is made up of variable gain amplifier and peripheral interface circuit thereof;
Said signal processing module is made up of single-chip microcomputer, A/D converter and peripheral interface circuit;
Said signal display module is made up of display screen and peripheral interface circuit thereof.
Said seal box is rectangular shape; The upper surface of seal box is transparent, and the dead ahead of seal box vertically is inserted with flexible member, and it is laminar that flexible member is; Strain resistor is fixed on the flexible member; Thermo-compensator is installed in the front of seal box; Power control switch, the first signal keyswitch, secondary signal keyswitch and the 3rd signal keyswitch are installed in the upper surface of seal box, and the LCD1602 LCD MODULE is affixed on the inside surface of seal box upper surface; The upper surface of strain resistor, thermo-compensator covers one deck plastic protective film for plastics; And around plastic protective film for plastics, be coated with last layer waterproof silicon rubber; In addition, place, the slit of LCD1602 LCD MODULE, power control switch, the first signal keyswitch, secondary signal keyswitch and the 3rd signal keyswitch and seal box also all coats waterproof silicon rubber.
The beneficial effect of the utility model is:
The utility model has been realized measurement, storage and the Presentation Function of flow velocity simultaneously.Compared with prior art, overcome the existing problem that can only fixedly mount, can't in water, use in the mobile device based on the flow rate of liquid measurement mechanism of strain ga(u)ge.Adopt the utility model, can satisfy in the water needs of the fluid-velocity survey in mobile device in the water such as robot, underawater ordnance and the hydrlolgic work.
Description of drawings
Fig. 1 is the structural representation based on the flow rate of liquid measurement mechanism of strain ga(u)ge;
Fig. 2 is the signal measurement module schematic diagram of the utility model;
Fig. 3 a is the first circuit structure schematic diagram of an embodiment of the utility model;
Fig. 3 b is the first circuit structure schematic diagram of an embodiment of the utility model;
Fig. 4 is the stereographic map of the measurement mechanism of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
The utility model provides a kind of flow rate of liquid measurement mechanism based on strain ga(u)ge, below in conjunction with accompanying drawing and embodiment the utility model is further specified.
As shown in Figure 1; A kind of structure of the flow rate of liquid measurement mechanism based on strain ga(u)ge is following: signal measurement module, signal amplification module, signal processing module and signal display module are connected in series successively, and signal measurement module, signal amplification module, signal processing module and signal display module are installed in the seal box 1.
As shown in Figure 2, the structure of signal measurement module is following: the positive pole of direct supply U connects strain resistor R11, and negative pole connects first resistance R 13, output voltage U
0An end connect the common node of strain resistor R11 and thermo-compensator R12, the other end connects the common node of first resistance R 13 and second resistance R 14, the common node of the GND earth potential connection thermo-compensator R12 and second resistance R 14.Signal measurement module utilizes the resistance strain measurement technology to convert the rate signal of fluid the change in resistance of strain resistor R11 into, and adopt the Hui Dengsi electric bridge that the increased resistance value of strain resistor R11 is converted into can the measured voltage changing value.The voltage of direct supply U is 5V.
Signal measurement module utilizes the resistance strain measurement technology working fluid to be converted into the strain of strain resistor R11 to the impulsive force of strain resistor R11; This strain shows through the change in resistance of strain resistor R11; Through making up the measuring accuracy that absolute change value that Wheatstone bridge is converted into resistance with small resistance relative changing value improves signal; Then, just can resistance absolute change value be converted into through the applying direct current potential source can the measured voltage changing value.Because strain resistor R11 is very responsive to temperature variation; Actual measured strain will comprise influence of temperature variation; Therefore the actual strain that can not reflect member increases by one and is used for thermo-compensator R12 to eliminate the influence of temperature variation to measurement result in bridge circuit.In the present embodiment, strain resistor R11 and thermo-compensator R12 constitute the half-bridge of measuring bridge, and first resistance R 13 and second resistance R 14 constitute the other half-bridge of electric bridge; First resistance R 13 and second resistance R 14 are fixing noninductive measuring resistance, and two half-bridges are formed Wheatstone bridge, can guarantee that like this output of electric bridge voltage is 0 when bridge balance, and metering circuit also no longer receives Influence of Temperature simultaneously.
The signal amplification module is made up of variable gain amplifier and peripheral interface circuit thereof; The signal amplification module can amplify the small magnitude of voltage changing value of signal measurement module output and filtering, and then extracts the electric signal relevant with flow rate of liquid.Through selecting high-precision variable grain amplifier for use, can adjust accordingly the enlargement factor of signal as required.
Signal processing module is made up of single-chip microcomputer, A/D converter and peripheral interface circuit; Analog voltage signal after signal processing module will amplify through A/D converter converts the digital signal that single-chip microcomputer can be discerned into; And this digital signal inputed in the memory RAM of single-chip microcomputer and store; Single-chip microcomputer can be stored digital signal and send; When the quantity of stored numbers signal has reached predetermined fault value, single-chip microcomputer can be removed the signal in the storer and begin to store new data.
Digital signal after single-chip microcomputer will be handled exports signal display module to the form of ASCII character.Signal display module is made up of display screen and peripheral interface circuit thereof.Display screen is preferably the character mode lcd display, and it is directly driven by single-chip microcomputer, and shows the flow velocity signal that has stored in real-time flow rate signal or the display-memory of current liquid according to the control button.
As shown in Figure 4, seal box 1 is rectangular shape; The upper surface of seal box 1 is transparent, and the dead ahead of seal box 1 vertically is inserted with flexible member 4,
Thermo-compensator R12 is installed in the front (being close on the seal box 1) of seal box 1, is mainly used in to offset the influence of fluid temperature to strain resistor R11, guarantees the accuracy of measurement result.
When opening the first signal keyswitch T1; 5 of LCD1602 LCD MODULEs show current flow velocity signal; When the first signal keyswitch T1 closes; Then can come the flow velocity signal stored in the display-memory through secondary signal keyswitch T2 and the 3rd signal keyswitch T3, defining secondary signal keyswitch T2 here is to show left, and the 3rd signal keyswitch T3 is demonstration to the right.Guaranteeing that said apparatus does not have under the prerequisite of leaking that seeps water, and can place flowing liquid or water mobile devices such as water robot, underawater ordnance to carry out the measurement of flow velocity in this device.
The upper surface of strain resistor R11, thermo-compensator R12 covers the very thin plastic protective film for plastics of one deck; And around plastic protective film for plastics, be coated with last layer waterproof silicon rubber; In addition; Place, the slit of LCD1602 LCD MODULE 5, power control switch 6, the first signal keyswitch T1, secondary signal keyswitch T2 and the 3rd signal keyswitch T3 and seal box also all coats waterproof silicon rubber, prevents that liquid from infiltrating and have influence on circuit.
LCD1602 LCD MODULE 5 is used to show measured value, and it is affixed on the inside surface on seal box top, and the top cover of seal box need be transparent, thereby guarantees that the data in the LCD1602 LCD MODULE 5 are visible.
Be an embodiment of the utility model below:
Shown in Fig. 3 a and Fig. 3 b; The positive pole of battery connects the common node of No. 1 pin of first capacitor C 1 and circuit of three-terminal voltage-stabilizing integrated LM7805, and No. 3 pins of circuit of three-terminal voltage-stabilizing integrated LM7805 (current potential of No. 3 pins of LM7805 is 5V) connect the common node of No. 8 pins of direct supply VCC, second capacitor C 2, strain resistor R11, first resistance R the 13, the 12 capacitor C the 12, the 11 capacitor C 11 and instrument amplifier AD8221 respectively;
No. 4 pins of instrument amplifier AD8221 connect the common node of strain resistor R11 and thermo-compensator R12; No. 1 pin of instrument amplifier AD8221 connects the common node of first resistance R 13 and second resistance R 14; No. 2 pins of instrument amplifier AD8221 connect No. 2 pins of BOURNS 3296 potentiometers; No. 3 pins of instrument amplifier AD8221 connect No. 1 pin of BOURNS 3296 potentiometers; The common node of the 23 capacitor C 23 that No. 6 pins of instrument amplifier AD8221 connect and No. 6 pins (current potential of No. 6 pins of reference voltage source ADR421 is 2.5V) of reference voltage source ADR421, No. 7 pins of instrument amplifier AD8221 connect the 3rd resistance R
PWith the common node of No. 61 pins of ATmega128 single-chip microcomputer, No. 2 pins of reference voltage source ADR421 connect the common node of the 21 capacitor C the 21, the 22 capacitor C 22 and direct supply VCC;
No. 51 pins of ATmega128 single-chip microcomputer, LED light D1, the tenth resistance R 10 and GND earth potential are connected in series successively; The DB0 pin that No. 35 pin to 42 pins of ATmega128 single-chip microcomputer connect LCD1602 LCD MODULE 5 respectively is to the DB7 pin; No. 54 pins of ATmega128 single-chip microcomputer connect No. 4 pins of jtag interface; No. 55 pins of ATmega128 single-chip microcomputer connect No. 3 pins of jtag interface; No. 56 pins of ATmega128 single-chip microcomputer connect No. 2 pins of jtag interface; No. 57 pins of ATmega128 single-chip microcomputer connect No. 1 pin of jtag interface; No. 52 pins of ATmega128 single-chip microcomputer connect No. 6 pins of jtag interfaces and the common node of direct supply VCC, and No. 64 pins of ATmega128 single-chip microcomputer connect the common node of No. 62 pins of the 4th capacitor C 4, the first inductance H1 and ATmega128 single-chip microcomputer, No. 5 pins of No. 53 pins connection jtag interfaces of ATmega128 single-chip microcomputer;
No. 10 pins of ATmega128 single-chip microcomputer connect the first signal keyswitch T1; No. 11 pins of ATmega128 single-chip microcomputer connect the first signal keyswitch T2; No. 12 pins of ATmega128 single-chip microcomputer connect the first signal keyswitch T3; No. 32 pins of ATmega128 single-chip microcomputer connect the RS pin of LCD1602 LCD MODULE 5; No. 33 pins of ATmega128 single-chip microcomputer connect the R/W pin of LCD1602 LCD MODULE 5, and No. 32 pins of ATmega128 single-chip microcomputer connect the E pin of LCD1602 LCD MODULE 5, and No. 23 pins of ATmega128 single-chip microcomputer connect No. 3 pins of OSC crystal oscillator;
The 3rd resistance R
PConnect the 3rd capacitor C
P, insert row the common node of No. 3 pins, the VO pin of LCD1602 LCD MODULE 5 connects right-hand member and the intermediate node of slide rheostat RES;
The numeral ground potential GND connects No. 2 pins, first capacitor C 1, second capacitor C 2, the negative pole of battery, No. 2 pins of insert row, No. 22 pins of ATmega128 single-chip microcomputer, No. 63 pins of ATmega128 single-chip microcomputer, No. 2 pins of OSC crystal oscillator, the left end of slide rheostat RES, the GND pin of LCD1602 LCD MODULE 5 and the LED-pin of LCD1602 LCD MODULE 5 of circuit of three-terminal voltage-stabilizing integrated LM7805 respectively;
Simulation earth potential AGND connects No. 5 pins, the 21 capacitor C the 21, the 22 capacitor C the 22, the 23 capacitor C 23, No. 4 pins of reference voltage source ADR421, the 3rd capacitor C of thermo-compensator R12, second resistance R the 14, the 12 capacitor C the 12, the 11 capacitor C 11, instrument amplifier AD8221 respectively
PWith the 4th capacitor C 4;
The numeral ground potential GND is connected with simulation earth potential AGND through magnetic bead RES2, can avoid noise like this.
Direct supply VCC connects No. 1 pin, the first inductance H1, No. 21 pins of ATmega128 single-chip microcomputer, No. 4 pins of OSC crystal oscillator, the VCC pin of LCD1602 LCD MODULE 5 and the LED+ pin of LCD1602 LCD MODULE 5 of insert row respectively.
Signal measurement module mainly is made up of strain resistor R11, thermo-compensator R12, first resistance R 13 and second resistance R 14; The signal amplification module mainly is made up of instrument amplifier AD8221, BOURNS 3296 potentiometers, reference voltage source ADR421, the 21 capacitor C the 21, the 22 capacitor C 22 and the 23 capacitor C 23; Signal processing module is mainly by insert row, jtag interface, ATmega128 single-chip microcomputer, OSC crystal oscillator, the first inductance H1, the 3rd capacitor C
P, the 4th capacitor C 4, the 3rd resistance R
P, LED light D1, the tenth resistance R 10, the first signal keyswitch T1, secondary signal keyswitch T2 and the 3rd signal keyswitch T3 constitute; Signal display module mainly is made up of with slide rheostat RES LCD 1602 LCD MODULEs 5;
The voltage of direct supply VCC is 5V, and the electric capacity of first capacitor C 1 is 0.33 μ F, and the electric capacity of second capacitor C 2 is 0.10 μ F; The electric capacity of the 12 capacitor C 12 is 10 μ F, and the electric capacity of the 11 capacitor C 11 is 0.1 μ F, and the electric capacity of the 22 capacitor C 22 is 10 μ F; The electric capacity of the 21 capacitor C 21 is 0.1 μ F; The electric capacity of the 23 capacitor C 23 is 0.1 μ F, and the voltage of anode is 7.5V, the 3rd capacitor C
PElectric capacity be 100pF, the electric capacity of the 4th capacitor C 4 is 10nF, the inductance of the first inductance H1 is 10 μ H, the 3rd resistance R
PResistance be 4.7k Ω, the resistance of the tenth resistance R 10 is 1k Ω, total resistance of slide rheostat RES is 10k Ω.
The course of work of the utility model is following:
When impacting; Working fluid converts the strain of strain resistor R11 into to the impulsive force of flexible member 4; This strain shows through its change in resistance; Again through making up the absolute change value that the Wheatstone bridge resistance relative changing value that this is small is converted into resistance with thermo-compensator R12, first resistance R 13 and second resistance R 14; Through the applying direct current potential source absolute change value of the resistance form with voltage is input among the instrument amplifier AD8221 at last, its enlargement factor can be through adjusting external BOURNS 3296 potentiometers of instrument amplifier AD8221, any variation that enlargement factor can be in 1～1000 scope.Its computing formula is following:
R is the resistance of BOURNS 3296 potentiometers, and n is an enlargement factor.
Insert reference voltage source ADR421 at the reference input of instrument amplifier AD8221, it can convert the supply voltage of 5V into 2.5V output, can guarantee that output voltage values after amplifying is for just.Wherein, the 21 capacitor C 21 and the 22 capacitor C 22 are input capacitance, can improve the circuit transient response and reduce power supply noise, and the 23 capacitor C 23 be an output capacitance, are used for any low-level noise voltage of filtering, the operate as normal of assurance circuit.Output voltage values after amplifying connects the ADC0 port (No. 61 pins) in the ATmega128 single-chip microcomputer; Because carry A/D converter in the ATmega128 single-chip microcomputer; Therefore can be directly with the digital signal of input analog voltage conversion of signals for himself discerning; Ten comparison A/D conversions are one by one adopted in A/D conversion, convert the aanalogvoltage of input to one 10 digital quantity, and transformation result are inputed in the memory RAM of single-chip microcomputer and store; When the quantity of stored numbers signal has reached predetermined fault value, single-chip microcomputer can be removed the signal in the storer and begin to store new data.Wherein, The reference voltage source of ADC (VREF) has reflected the conversion range of ADC; VREF can be AVCC (No. 64 pins), inner 2.56V benchmark or the voltage (selecting AVCC here) that is external in AREF pin (No. 62 pins); AVCC links to each other with ADC through a passive switch, and reference voltage carries out decoupling zero through on the AREF pin, adding an electric capacity, with squelch better.The OSC crystal oscillator is the external crystal-controlled oscillation of single-chip microcomputer, and the crystal oscillator frequency of being selected for use in the present embodiment is 11.0592MHZ, and it combines the inner circuit of single-chip microcomputer, produces the necessary clock frequency of single-chip microcomputer.Jtag interface is that single-chip microcomputer is downloaded emulator interface, can program be write in the single-chip microcomputer through it.At last; To pass through signal that single-chip microcomputer handles inputs in the LCD1602 LCD MODULE 5 with the form of ASCII character and shows that its display mode can be controlled by the first signal keyswitch T1, secondary signal keyswitch T2 and the 3rd signal keyswitch T3.
Because the supply voltage of these all components and parts of device is 5V, therefore in diagram, can the direct supply of 7.4V be changed through the electric capacity that is respectively 0.10 μ F and 0.33 μ F at two capacitances of the outside adding of circuit of three-terminal voltage-stabilizing integrated LM7805.In addition, Led pilot lamp D1 links to each other with the IO port of single-chip microcomputer, is used for judging whether operate as normal of single-chip microcomputer.
Though the foregoing description has been done more detailed text description to the utility model; But these text descriptions; It is text description to the utility model mentality of designing; Rather than the restriction of the utility model mentality of designing, any combination, increase or omission that is no more than the utility model mentality of designing all falls in the protection domain of the utility model.
Claims (5)
1. flow rate of liquid measurement mechanism based on strain ga(u)ge; It is characterized in that; Its structure is following: signal measurement module, signal amplification module, signal processing module and signal display module are connected in series successively, and signal measurement module, signal amplification module, signal processing module and signal display module are installed in the seal box (1).
2. a kind of flow rate of liquid measurement mechanism according to claim 1 based on strain ga(u)ge; It is characterized in that; The structure of said signal measurement module is following: the positive pole of direct supply (U) connects strain resistor (R11); Negative pole connects first resistance (R13); One end of output voltage (U0) connects the common node of strain resistor (R11) and thermo-compensator (R12), and the other end connects the common node of first resistance (R13) and second resistance (R14), and the GND earth potential connects the common node of thermo-compensator (R12) and second resistance (R14).
3. a kind of flow rate of liquid measurement mechanism based on strain ga(u)ge according to claim 2 is characterized in that the voltage of said direct supply (U) is 5V.
4. a kind of flow rate of liquid measurement mechanism based on strain ga(u)ge according to claim 1 is characterized in that said signal amplification module is made up of variable gain amplifier and peripheral interface circuit thereof;
Said signal processing module is made up of single-chip microcomputer, A/D converter and peripheral interface circuit;
Said signal display module is made up of display screen and peripheral interface circuit thereof.
5. a kind of flow rate of liquid measurement mechanism based on strain ga(u)ge according to claim 1 is characterized in that said seal box (1) is rectangular shape; The upper surface of seal box (1) is transparent, and the dead ahead of seal box (1) vertically is inserted with flexible member (4), and flexible member (4) is laminar; Strain resistor (R11) is fixed on the flexible member (4); Thermo-compensator (R12) is installed in the front of seal box (1); Power control switch (6), the first signal keyswitch (T1), secondary signal keyswitch (T2) and the 3rd signal keyswitch (T3) are installed in the upper surface of seal box (1), and LCD1602 LCD MODULE (5) is affixed on the inside surface of seal box (1) upper surface; The upper surface of strain resistor (R11), thermo-compensator (R12) covers one deck plastic protective film for plastics; And around plastic protective film for plastics, be coated with last layer waterproof silicon rubber; In addition, LCD1602 LCD MODULE (5), power control switch (6), the first signal keyswitch (T1), secondary signal keyswitch (T2) and the 3rd signal keyswitch (T3) are also all coated waterproof silicon rubber with the place, slit of seal box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220174927 CN202599971U (en) | 2012-04-23 | 2012-04-23 | Liquid flow rate measuring device based on resistance strain gage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220174927 CN202599971U (en) | 2012-04-23 | 2012-04-23 | Liquid flow rate measuring device based on resistance strain gage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202599971U true CN202599971U (en) | 2012-12-12 |
Family
ID=47317501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220174927 Expired - Fee Related CN202599971U (en) | 2012-04-23 | 2012-04-23 | Liquid flow rate measuring device based on resistance strain gage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202599971U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018873A (en) * | 2016-05-12 | 2016-10-12 | 三峡大学 | Device and method for comprehensively measuring water flow parameters |
| CN106093462A (en) * | 2016-07-30 | 2016-11-09 | 无锡乐华自动化科技有限公司 | A kind of pipe flow speed sensor |
| CN106841663A (en) * | 2015-12-04 | 2017-06-13 | 无锡乐华自动化科技有限公司 | The strain-type pipe flow speed sensor and application method of a kind of vibration plate structure |
| CN106841668A (en) * | 2015-12-04 | 2017-06-13 | 无锡乐华自动化科技有限公司 | The pipe flow speed sensor and application method of a kind of fixed blade wheel structure |
| CN109798943A (en) * | 2019-03-01 | 2019-05-24 | 孙良荣 | A kind of water meter or flowmeter structure based on resistance strain type sensor |
| CN110945364A (en) * | 2017-08-05 | 2020-03-31 | 株式会社村田制作所 | Wind speed measuring device and wind speed measuring device |
| CN118174731A (en) * | 2024-03-11 | 2024-06-11 | 南京航空航天大学 | Analog signal processing circuit based on output end of double-channel circular induction synchronizer |
-
2012
- 2012-04-23 CN CN 201220174927 patent/CN202599971U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841663A (en) * | 2015-12-04 | 2017-06-13 | 无锡乐华自动化科技有限公司 | The strain-type pipe flow speed sensor and application method of a kind of vibration plate structure |
| CN106841668A (en) * | 2015-12-04 | 2017-06-13 | 无锡乐华自动化科技有限公司 | The pipe flow speed sensor and application method of a kind of fixed blade wheel structure |
| CN106018873A (en) * | 2016-05-12 | 2016-10-12 | 三峡大学 | Device and method for comprehensively measuring water flow parameters |
| CN106093462A (en) * | 2016-07-30 | 2016-11-09 | 无锡乐华自动化科技有限公司 | A kind of pipe flow speed sensor |
| CN110945364A (en) * | 2017-08-05 | 2020-03-31 | 株式会社村田制作所 | Wind speed measuring device and wind speed measuring device |
| CN109798943A (en) * | 2019-03-01 | 2019-05-24 | 孙良荣 | A kind of water meter or flowmeter structure based on resistance strain type sensor |
| CN118174731A (en) * | 2024-03-11 | 2024-06-11 | 南京航空航天大学 | Analog signal processing circuit based on output end of double-channel circular induction synchronizer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202599971U (en) | Liquid flow rate measuring device based on resistance strain gage | |
| CN101936791B (en) | Digital pressure gauge | |
| CN101592677A (en) | A kind of digital closed loop servo circuit that is used for quartz flexible accelerometer | |
| CN101893472A (en) | Method and device for measuring tonnage of automobile | |
| CN102360027B (en) | Differential pressure type airspeed sensor testing system | |
| CN203069616U (en) | Portable wind speed and wind direction measuring instrument | |
| CN1995941A (en) | Omnibearing sand grain creeping and wind speed and wind direction dynamic collecting instrument | |
| CN201754114U (en) | Absolute pressure sensor with low bandwidth voltage output range | |
| CN204705423U (en) | A kind of flapping-wing aircraft lift test macro | |
| CN202256099U (en) | Intelligent slurry density and liquid level comprehensive analyzer | |
| CN201402145Y (en) | Analog sensor circuit | |
| CN204832237U (en) | Portable phone aerovane | |
| CN203719620U (en) | Portable low-power static state resistance strain gauge | |
| CN103852002A (en) | Portable low-power-consumption static resistance strain indicator | |
| CN201937685U (en) | Mobile phone with air pressure and altitude measuring function | |
| CN103940969A (en) | System and method for measuring compressibility coefficient of organic liquid based on standard monocrystal silicon sphere | |
| CN202522583U (en) | Resistance strain transducer type device for detecting current speed in pipeline | |
| CN203259542U (en) | Flexible pendulous accelerometer digital control circuit | |
| CN105157906A (en) | Aircraft high-speed flight process micro-pressure measuring device and measuring method | |
| CN204008003U (en) | A kind of pin-point accuracy pressure controller | |
| CN217359949U (en) | Ocean current velocity of flow monitoring devices | |
| CN203053529U (en) | Weighting device | |
| CN202710761U (en) | Portable weather induction instrument | |
| CN105092139B (en) | Pneumatic equipment bladess surface pressure measurement cover and its measuring system | |
| CN205352461U (en) | Dark monitoring devices of sea water temperature |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121212 Termination date: 20140423 |