CN111595905A - Hydraulic pipeline bubble monitoring device and method - Google Patents
Hydraulic pipeline bubble monitoring device and method Download PDFInfo
- Publication number
- CN111595905A CN111595905A CN202010451866.XA CN202010451866A CN111595905A CN 111595905 A CN111595905 A CN 111595905A CN 202010451866 A CN202010451866 A CN 202010451866A CN 111595905 A CN111595905 A CN 111595905A
- Authority
- CN
- China
- Prior art keywords
- hydraulic
- output
- hydraulic pipeline
- sensing electrode
- pipeline
- 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.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/028—Circuits therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/857—Monitoring of fluid pressure systems
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Fluid Mechanics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Pipeline Systems (AREA)
Abstract
The application discloses a hydraulic pipeline bubble monitoring device and method, and belongs to the technical field of hydraulic system monitoring. The method comprises the steps of respectively obtaining the internal resistances R0 and R1 of the hydraulic pipeline when the hydraulic pipeline is not filled with oil and when the hydraulic pipeline is filled with oil; after the hydraulic system starts to work, oil is filled into the hydraulic pipeline, and the internal resistance R2 of the hydraulic pipeline is calculated; from R0, R1, and R2, an air condition within a hydraulic circuit in the hydraulic system is determined. This application is through non-contact hydraulic line's mode, with the attached hydraulic line of input sensing electrode and output sensing electrode on, calculate the internal impedance of hydraulic line according to the voltage of output sensing electrode output to judge whether there is the bubble to exist in the hydraulic line, realized the real-time effective monitoring to the bubble condition in the hydraulic line.
Description
Technical Field
The invention belongs to the technical field of hydraulic system monitoring, and relates to a device and a method for monitoring bubbles in a hydraulic pipeline.
Background
The exoskeleton hydraulic system is easy to inject air and form bubbles in a hydraulic pipeline in the processes of hydraulic oil injection and maintenance, which causes serious interference to hydraulic control, so that the condition of the bubbles in the hydraulic pipeline needs to be monitored.
At present, when monitoring whether bubbles exist in a hydraulic pipeline, an effective and convenient method is not available, and the aim of automatically discharging air is usually achieved by repeatedly operating a hydraulic system.
Disclosure of Invention
In order to solve the problem that whether bubbles exist in a hydraulic pipeline or not can not be judged in the related technology, the application provides a device and a method for monitoring the bubbles in the hydraulic pipeline, and whether bubbles exist in the hydraulic pipeline or not can be automatically monitored. The specific technical scheme is as follows:
in a first aspect, the present application provides a hydraulic line bubble monitoring device, and this hydraulic line bubble monitoring device includes signal generator, input sensing electrode, output sensing electrode, collection system and control display system, wherein: the output end of the signal generator is connected with the input end of the input sensing electrode, the output end of the input sensing electrode is connected with the surface of a hydraulic pipeline to be monitored, the other end of the surface of the hydraulic pipeline is connected with the input end of the output sensing electrode, the output end of the output sensing electrode is connected with the input end of the acquisition system, and the acquisition system is connected with the monitoring display system.
Optionally, the signal generator outputs a square wave cyclically varying from a first predetermined frequency to a second predetermined frequency, and a peak-to-peak value of the square wave is a predetermined peak value.
Optionally, the first predetermined frequency is 1Hz, the second predetermined frequency is 1kHz, and the peak-to-peak value is 3.3V.
Optionally, the input sensing electrode and the output sensing electrode are flexible and bondable copper electrodes, and are connected to the outer surface of the hydraulic pipeline in a bonding manner.
Optionally, the collection system is provided with a voltage division circuit, the voltage division circuit includes: equivalent resistance Rg, first divider resistance Rs and second divider resistance R of hydraulic pipelineLWherein: the input end of the hydraulic pipeline equivalent impedance Rg is connected with the voltage output end of the output sensing electrode, the output end of the hydraulic pipeline equivalent impedance Rg is connected with the first end of the first divider resistor Rs, and the second end of the first divider resistor Rs is connected with the second divider resistor RLThe second end of the second voltage-dividing resistor RL is grounded GND, and the voltage of the second end of the first voltage-dividing resistor Rs is divided by the second voltage-dividing resistor RL and then is output as the voltage of the acquisition system.
Optionally, the hydraulic pipeline bubble monitoring device further comprises a communication module, the output end of the acquisition system is connected with the input end of the communication module, and the output end of the communication module is connected with the monitoring display system.
Optionally, the communication mode of the communication module is wireless communication or wired communication.
In a second aspect, the present application further provides a hydraulic line bubble monitoring method, where the hydraulic line bubble monitoring method employs the hydraulic line bubble monitoring apparatus provided in the first aspect and various optional manners of the first aspect, and the hydraulic line bubble monitoring method includes: when oil is not injected into the hydraulic pipeline, controlling the output frequency of the signal generator to change from a first preset frequency to a second preset frequency in a circulating way, wherein the peak-to-peak value is a square wave with a preset peak value, collecting the voltage output by the output sensing electrode by using the collecting system, and calculating the internal impedance R0 of the hydraulic pipeline; when the hydraulic pipeline is filled with oil, controlling the output frequency of the signal generator to circularly change from the first preset frequency to the second preset frequency and to obtain a square wave with a peak value being a preset peak value, acquiring the voltage output by the output sensing electrode by using the acquisition system, and calculating the internal impedance R1 of the hydraulic pipeline; after a hydraulic system starts to work, injecting oil into the hydraulic pipeline, controlling the signal generator to output square waves with the frequency changing from the first preset frequency to the second preset frequency in a circulating mode and the peak-to-peak value being a preset peak value, collecting the voltage output by the output sensing electrode by using the collecting system, and calculating the internal impedance R2 of the hydraulic pipeline; air conditions within hydraulic lines in the hydraulic system are determined from R0, R1, and R2.
Optionally, the determining the air condition in the hydraulic line of the hydraulic system according to R0, R1 and R2 includes: calculating a K value by the formula (R2-R0)/(R1-R0); when the K value is 1, judging that no air exists in a hydraulic pipeline in the hydraulic system; and when the K value is less than 1, determining that air exists in a hydraulic pipeline in the hydraulic system, wherein the K value is also used for indicating the air ratio in the hydraulic pipeline.
Optionally, the first predetermined frequency is 1Hz, the second predetermined frequency is 1kHz, and the peak-to-peak value is 3.3V.
According to the technical scheme, the application can at least realize the following beneficial effects:
the input sensing electrode and the output sensing electrode are attached to the hydraulic pipeline in a non-contact hydraulic pipeline mode, and the internal impedance of the hydraulic pipeline is calculated according to the voltage output by the output sensing electrode, so that whether bubbles exist in the hydraulic pipeline is judged, and the real-time effective monitoring of the bubble condition in the hydraulic pipeline is realized.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of a hydraulic line bubble monitoring device provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of a hydraulic line bubble monitoring device provided in another embodiment of the present application;
FIG. 3 is a schematic circuit diagram of an acquisition system provided in one embodiment of the present application;
FIG. 4 is a flow chart of a method of monitoring a hydraulic line bubble provided in an embodiment of the present application.
Wherein the reference numbers are as follows:
10. a signal generator; 20. inputting a sensing electrode; 30. an output sensing electrode; 40. an acquisition system; 50. monitoring a display system; 60. a communication module; 70. a hydraulic circuit.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Fig. 1 is a schematic structural diagram of a hydraulic line bubble monitoring device provided in an embodiment of the present application, where the hydraulic line bubble monitoring device provided in the present application may include: signal generator 10, input sensing electrode 20, output sensing electrode 30, acquisition system 40 and monitor display system 50.
The output end of the signal generator 10 is connected with the input end of the input sensing electrode 20, the output end of the input sensing electrode 20 is connected with the surface of the hydraulic pipeline 70 to be monitored, the other end of the surface of the hydraulic pipeline 70 is connected with the input end of the output sensing electrode 30, the output end of the output sensing electrode 30 is connected with the input end of the acquisition system 40, and the acquisition system 40 is connected with the monitoring display system 50.
In a possible implementation manner, in order to implement communication between the collection system 40 and the display system, the hydraulic pipeline 70 bubble monitoring device provided in the present application may further include a communication module 60, please refer to fig. 2, which is a schematic structural diagram of the hydraulic pipeline 70 bubble monitoring device provided in another embodiment of the present application, wherein an output end of the collection system 40 is connected to an input end of the communication module 60, and an output end of the communication module 60 is connected to the monitoring display system 50.
The communication mode of the communication module 60 is wireless communication or wired communication. The wireless communication may include bluetooth communication, WLAN communication, NFC communication, and the like.
The signal generator 10 can output a square wave, and in practical applications, the signal generator 10 can continuously output a square wave with a frequency cyclically changing from a first predetermined frequency to a second predetermined frequency, and the peak value of the square wave is a predetermined peak value.
For example, the first predetermined frequency is 1Hz, the second predetermined frequency is 1kHz, and the peak-to-peak value is 3.3V.
The input sensing electrode 20 and the output sensing electrode 30 can be flexible and can be pasted with copper electrodes, and are connected with the outer surface of the hydraulic pipeline 70 in a pasting mode, the flexible and capable pasting copper electrodes can be attached to the outer surface of the hydraulic pipeline 70, and monitoring precision is improved.
In order to determine whether there is a bubble in the hydraulic line 70, a voltage divider circuit may be disposed in the acquisition system 40 in the present application, please refer to fig. 3, which is a schematic circuit diagram of the acquisition system 40 provided in an embodiment of the present application. The voltage dividing circuit includes: the equivalent resistance Rg, the first divider resistance Rs and the second divider resistance R of the hydraulic circuit 70L。
The input end of the equivalent impedance Rg of the hydraulic pipeline 70 is connected to the voltage output end of the output sensing electrode 30, the output end of the equivalent impedance Rg of the hydraulic pipeline 70 is connected to the first end of the first voltage dividing resistor Rs, the second end of the first voltage dividing resistor Rs is connected to the first end of the second voltage dividing resistor RL, the second end of the second voltage dividing resistor RL is grounded GND, and the voltage of the second end of the first voltage dividing resistor Rs is divided by the second voltage dividing resistor RL and then output as the voltage of the acquisition system 40.
The voltage divider circuit can know that: the acquisition system 40 can acquire the square wave signal transmitted from the output sensing electrode 30 in real time, and then calculate the peak-to-peak value Vin of the square wave signal in real time, and calculate the equivalent impedance Rg-R of the hydraulic pipeline 70 through the voltage dividing circuitL*Vin/Vout-RL-Rs。
In practical implementation, the monitoring display system 50 may be a device with a display function, such as a common desktop computer, a tablet computer, a mobile phone, an e-reader, and the like. Obviously, the monitoring display system 50 may further include a processing module and an alarm indication module, the processing module obtains the voltage output by the acquisition system 40, calculates a bubble indication parameter in the hydraulic pipeline 70, and controls the alarm indication module to perform alarm indication when the bubble indication parameter is used to indicate that bubbles exist in the hydraulic pipeline 70 or the existing bubbles exceed a predetermined threshold. The processing module can be a CPU or a chip with processing capability, and the alarm indicating module can be an indicator light or a sound prompting system.
To sum up, the hydraulic pressure pipeline bubble monitoring devices that this application provided, through non-contact hydraulic pressure pipeline's mode, with the attached on hydraulic pressure pipeline of input sensing electrode and output sensing electrode, calculate the internal impedance of hydraulic pressure pipeline according to the voltage of output sensing electrode output to whether there is the bubble in the judgement hydraulic pressure pipeline to exist, realized the real-time effective monitoring to the bubble condition in the hydraulic pressure pipeline.
In addition, the application also provides a hydraulic pipeline bubble monitoring method, and the method adopts the hydraulic pipeline bubble monitoring device shown in fig. 1 or fig. 2. The hydraulic pipeline bubble monitoring method can be realized through software, hardware or a combination of the software and the hardware. Referring to fig. 4, which is a flowchart illustrating a method for monitoring bubbles in a hydraulic line according to an embodiment of the present application, the method for monitoring bubbles in a hydraulic line may include the following steps:
when the method for monitoring the bubbles in the hydraulic pipeline is realized, the defined first preset frequency is 1Hz, the defined second preset frequency is 1kHz, and the peak-to-peak value is 3.3V.
As can be seen from the voltage divider circuit of fig. 3: the acquisition system 40 can acquire the square wave signal transmitted from the output sensing electrode 30 in real time, and then calculate the peak value Vin of the square wave signal in real time, and calculate the equivalent impedance Rg R of the hydraulic pipeline through the voltage dividing circuitL*Vin/Vout-RL-Rs。
The hydraulic line internal resistance R0 can be calculated by the above formula of the equivalent resistance Rg of the hydraulic line.
similarly, the hydraulic line internal resistance R1 can be calculated by the above formula of the equivalent resistance Rg of the hydraulic line.
similarly, the hydraulic line internal resistance R2 can be calculated by the above formula of the equivalent resistance Rg of the hydraulic line.
In step 404, air conditions in hydraulic lines in the hydraulic system are determined based on R0, R1, and R2.
When determining the air condition in the hydraulic lines in the hydraulic system from R0, R1, and R2, the K value may be calculated first by the formula (R2-R0)/(R1-R0).
When the K value is 1, judging that no air exists in a hydraulic pipeline in the hydraulic system;
and when the K value is less than 1, judging that air exists in a hydraulic pipeline in the hydraulic system.
In addition, the K value may also be used to indicate the air fraction in the hydraulic line, such as a smaller K value indicating more air bubbles in the hydraulic line.
In summary, the hydraulic pipeline bubble monitoring method provided by the application attaches the input sensing electrode and the output sensing electrode to the hydraulic pipeline in a non-contact hydraulic pipeline mode, and calculates the internal impedance of the hydraulic pipeline according to the voltage output by the output sensing electrode, so as to judge whether bubbles exist in the hydraulic pipeline, and realize the real-time effective monitoring of the bubble condition in the hydraulic pipeline.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. The utility model provides a hydraulic line bubble monitoring devices, a serial communication port, hydraulic line bubble monitoring devices includes signal generator, input sensing electrode, output sensing electrode, collection system and control display system, wherein:
the output end of the signal generator is connected with the input end of the input sensing electrode, the output end of the input sensing electrode is connected with the surface of a hydraulic pipeline to be monitored, the other end of the surface of the hydraulic pipeline is connected with the input end of the output sensing electrode, the output end of the output sensing electrode is connected with the input end of the acquisition system, and the acquisition system is connected with the monitoring display system.
2. The hydraulic line bubble monitoring device according to claim 1, wherein the signal generator outputs a square wave that cycles from a first predetermined frequency to a second predetermined frequency, the square wave having a peak-to-peak value that is a predetermined peak value.
3. The hydraulic line bubble monitoring device according to claim 2, wherein said first predetermined frequency is 1Hz, said second predetermined frequency is 1kHz, and said peak-to-peak value is 3.3V.
4. The hydraulic pipeline bubble monitoring device according to claim 1, wherein the input sensing electrode and the output sensing electrode are flexible and attachable copper electrodes, and are connected with the outer surface of the hydraulic pipeline in an attaching manner.
5. The hydraulic line bubble monitoring device of claim 1, wherein the acquisition system is provided with a voltage divider circuit comprising: equivalent resistance Rg, first divider resistance Rs and second divider resistance R of hydraulic pipelineLWherein:
the input end of the hydraulic pipeline equivalent impedance Rg is connected with the voltage output end of the output sensing electrode, the output end of the hydraulic pipeline equivalent impedance Rg is connected with the first end of the first divider resistor Rs, the second end of the first divider resistor Rs is connected with the first end of the second divider resistor RL, the second end of the second divider resistor RL is grounded GND, and the voltage of the second end of the first divider resistor Rs is divided by the second divider resistor RL and then is used as the voltage output of the acquisition system.
6. The hydraulic pipeline bubble monitoring device according to claim 1, further comprising a communication module, wherein an output end of the acquisition system is connected with an input end of the communication module, and an output end of the communication module is connected with the monitoring display system.
7. The hydraulic pipeline bubble monitoring device according to claim 1, wherein the communication mode of the communication module is wireless communication or wired communication.
8. A hydraulic line bubble monitoring method, wherein the hydraulic line bubble monitoring method employs a hydraulic line bubble monitoring apparatus according to any one of claims 1 to 7, and the hydraulic line bubble monitoring method includes:
when oil is not injected into the hydraulic pipeline, controlling the output frequency of the signal generator to change from a first preset frequency to a second preset frequency in a circulating way, wherein the peak-to-peak value is a square wave with a preset peak value, collecting the voltage output by the output sensing electrode by using the collecting system, and calculating the internal impedance R0 of the hydraulic pipeline;
when the hydraulic pipeline is filled with oil, controlling the output frequency of the signal generator to circularly change from the first preset frequency to the second preset frequency and to obtain a square wave with a peak value being a preset peak value, acquiring the voltage output by the output sensing electrode by using the acquisition system, and calculating the internal impedance R1 of the hydraulic pipeline;
after a hydraulic system starts to work, injecting oil into the hydraulic pipeline, controlling the signal generator to output square waves with the frequency changing from the first preset frequency to the second preset frequency in a circulating mode and the peak-to-peak value being a preset peak value, collecting the voltage output by the output sensing electrode by using the collecting system, and calculating the internal impedance R2 of the hydraulic pipeline;
air conditions within hydraulic lines in the hydraulic system are determined from R0, R1, and R2.
9. The hydraulic line bubble monitoring method of claim 8, wherein said determining an air condition within a hydraulic line in the hydraulic system from R0, R1, and R2 comprises:
calculating a K value by the formula (R2-R0)/(R1-R0);
when the K value is 1, judging that no air exists in a hydraulic pipeline in the hydraulic system;
and when the K value is less than 1, determining that air exists in a hydraulic pipeline in the hydraulic system, wherein the K value is also used for indicating the air ratio in the hydraulic pipeline.
10. The hydraulic line bubble monitoring method of claim 8, wherein said first predetermined frequency is 1Hz, said second predetermined frequency is 1kHz, and said peak-to-peak value is 3.3V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010451866.XA CN111595905A (en) | 2020-05-25 | 2020-05-25 | Hydraulic pipeline bubble monitoring device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010451866.XA CN111595905A (en) | 2020-05-25 | 2020-05-25 | Hydraulic pipeline bubble monitoring device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111595905A true CN111595905A (en) | 2020-08-28 |
Family
ID=72188697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010451866.XA Pending CN111595905A (en) | 2020-05-25 | 2020-05-25 | Hydraulic pipeline bubble monitoring device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111595905A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1414382A (en) * | 2002-08-30 | 2003-04-30 | 天津大学 | Detector of gas liquid two phase flow split-phase content based on resistance chromatographic imaging and method |
| CN1686048A (en) * | 2005-06-06 | 2005-10-26 | 清华大学 | Skin moisture measuring method |
| CN101093207A (en) * | 2007-06-21 | 2007-12-26 | 天津大学 | Impedance sensor of split phase ratio of two phase flows, and method for optimizing structural parameter |
| CN101441186A (en) * | 2007-11-21 | 2009-05-27 | 山东师范大学 | Surface acoustic wave type non-contact electric conductivity detector and detection method thereof |
| CN106154048A (en) * | 2016-08-12 | 2016-11-23 | 浙江大学 | The anti-measurement apparatus of contactless fluid resistance based on digital phase-sensitive solution mediation virtual inductor technology and method |
| CN207654176U (en) * | 2017-05-23 | 2018-07-27 | 北京康智乐思网络科技有限公司 | A kind of ac square wave signal generator for measuring saliva impedance |
-
2020
- 2020-05-25 CN CN202010451866.XA patent/CN111595905A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1414382A (en) * | 2002-08-30 | 2003-04-30 | 天津大学 | Detector of gas liquid two phase flow split-phase content based on resistance chromatographic imaging and method |
| CN1686048A (en) * | 2005-06-06 | 2005-10-26 | 清华大学 | Skin moisture measuring method |
| CN101093207A (en) * | 2007-06-21 | 2007-12-26 | 天津大学 | Impedance sensor of split phase ratio of two phase flows, and method for optimizing structural parameter |
| CN101441186A (en) * | 2007-11-21 | 2009-05-27 | 山东师范大学 | Surface acoustic wave type non-contact electric conductivity detector and detection method thereof |
| CN106154048A (en) * | 2016-08-12 | 2016-11-23 | 浙江大学 | The anti-measurement apparatus of contactless fluid resistance based on digital phase-sensitive solution mediation virtual inductor technology and method |
| CN207654176U (en) * | 2017-05-23 | 2018-07-27 | 北京康智乐思网络科技有限公司 | A kind of ac square wave signal generator for measuring saliva impedance |
Non-Patent Citations (2)
| Title |
|---|
| 孙宝江 等: "垂直气液两相管流中的空隙率波测量", 《北京大学学报(自然科学版)》 * |
| 林等: "气液两相流相含率测量新方法研究", 《工程热物理学报》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102116647B (en) | Flow meter | |
| CN105258836A (en) | System and method for monitoring state of bolt | |
| US11156496B2 (en) | Method for detecting bandwidth of linear vibration motor | |
| CN105678987B (en) | Unstable state vibration equipment wireless monitoring device | |
| JP2006060762A5 (en) | ||
| CN103677234A (en) | Information processing method and electronic equipment | |
| CN106034351A (en) | Transmission power adjusting method and electronic equipment | |
| CN116771655B (en) | Intelligent control system and intelligent control method for water pump | |
| CN104717595B (en) | A kind of detection method, the detection means of loudspeaker module function | |
| CN111595905A (en) | Hydraulic pipeline bubble monitoring device and method | |
| CN103134697B (en) | Fault diagnosis method and system for vibration reduction system of concrete pump truck and concrete pump truck | |
| CN103115785B (en) | Fault diagnosis method and system for vibration reduction system of concrete pump truck and concrete pump truck | |
| CN107973230A (en) | A kind of crane full working scope oil consumption monitors system and method | |
| CN115371777A (en) | Monitoring and early warning method, device, system, equipment and medium of Coriolis flowmeter | |
| CN201273842Y (en) | Bridge monitoring apparatus based on sensor array | |
| CN104122557A (en) | Method for carrying out ultrasonic detection by using mobile phone and electronic equipment | |
| CN204016259U (en) | A kind of patient temperature wireless monitoring device for ward | |
| CN203100774U (en) | Bluetooth hygrothermograph | |
| CN104879294B (en) | A kind of water pump transient signal analytical equipment and method | |
| CN205729896U (en) | Visualization vein transfusion monitoring system based on WIFI | |
| CN117269946A (en) | Distance determining method and device between Bluetooth devices, electronic device and medium | |
| CN204989502U (en) | Metal detector | |
| CN205903251U (en) | Blood pressure measurement system based on network | |
| CN205449413U (en) | Hydrostatic test platform | |
| CN105641900A (en) | Respiration state reminding method, electronic equipment and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |