CN201226003Y - Apparatus for detecting liquid electrical parameter - Google Patents
Apparatus for detecting liquid electrical parameter Download PDFInfo
- Publication number
- CN201226003Y CN201226003Y CNU2008200570503U CN200820057050U CN201226003Y CN 201226003 Y CN201226003 Y CN 201226003Y CN U2008200570503 U CNU2008200570503 U CN U2008200570503U CN 200820057050 U CN200820057050 U CN 200820057050U CN 201226003 Y CN201226003 Y CN 201226003Y
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- CN
- China
- Prior art keywords
- electrical quantity
- liquid electrical
- tracer liquid
- probe
- mcu unit
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Abstract
The utility model relates to a device for detecting the electric parameters of a liquid which includes a main board, a shell at the outside of the main board, a clock circuit module fixed on the main board and a probe connected with the main board through a lead; the main board is provided with a MCU unit, a memory unit, a voltage regulation module, a power interface, a temperature detecting module, a waveform generator and an isolating transformer module; the memory unit is connected with the MCU unit; the temperature detecting module is connected with the MCU unit; the power interface is connected with the MCU unit through the voltage regulation module; the MCU unit is connected with the probe through the waveform generator and theisolating transformer module in turn; an analog/digital conversion module, a wave filter and an amplifier are arranged on the main board; the MCU unit is connected with the wave filter through the analog/digital conversion module; the wave filter is connected with the probe through the amplifier. The device for detecting the electric parameters of a liquid has the advantage of high measuring precision which can measure the liquid parameters at any time; and the device for detecting the electric parameters of a liquid is suitable for the on-line detection on the concentration of viable bacteria during a fermenting process in particular.
Description
Technical field
The utility model relates to a kind of device of tracer liquid electrical quantity.
Background technology
The measurement of liquid electrical quantity has critical role in modern scientific research and productive life, be widely used in medical field such as blood analysis, blood flow measurement, human body impedance imaging and etch state monitoring, sweat control, battery status monitoring, the monitoring of crude oil timber tobacco moisture percentage etc. and relate in the commercial production field of liquid condition assessment.
Usually use two electrodes during the solid electric parameter measurement, import electric current and potential measurement and be in same position, use with a pair of electrode.The measurement of liquid electrical quantity usually needs four electrodes, because the electric current place of entering can form interfacial polarization, produce polarization impedance, introduce the position measurement current potential of electric current this moment again in the outside, interface, the truth that obviously can not reflect sample interior, this moment just need be from sample interior, the location point measurement current potential at the interface of avoiding polarizing.
The electric current current potential divergence type resistance apparatus that is used for the liquid conduction specificity analysis in the prior art can only be used for measuring resistance, and can not accurately measure impedance.Industrial, the manual inspection method is used in the tracer liquid impedance mostly, and the manual inspection method exist can not continuous monitoring, non real-time detects, causes easily problems such as error.
Summary of the invention
The purpose of this utility model provides a kind of device of tracer liquid electrical quantity, and can effectively solve existing liquid electrical parameters detection technology can not continuous monitoring, non real-time detects, causes easily problems such as error.The utility model relates to a kind of device of tracer liquid electrical quantity, the device that comprises a kind of tracer liquid electrical quantity, comprise mainboard, the shell of mainboard outside, be fixed on the clock circuit module on the mainboard, the probe that is connected with mainboard by lead, it is characterized in that: mainboard is provided with the MCU unit, storage unit, Voltage stabilizing module, power interface, temperature measurement module, waveform generator, the isolating transformer module, storage unit is connected with the MCU unit, temperature measurement module is connected with the MCU unit, power interface is connected with the MCU unit by Voltage stabilizing module, the MCU unit passes through waveform generator successively, the isolating transformer module is connected with probe, mainboard is provided with the A/D analog-to-digital conversion module, wave filter, amplifier, the MCU unit is connected with wave filter by the A/D analog-to-digital conversion module, and wave filter is connected with probe by amplifier.Described mainboard is provided with push-button interface and display screen interface, and push-button interface is connected with the MCU unit respectively with display screen interface.Described shell is provided with button, and button is connected with push-button interface.Described shell is provided with display screen, and display screen is connected with display screen interface.Described display screen is a LCD display.Described waveform generator is Direct Digital Frequency Synthesizers (DDS).Described MCU unit can be dsp chip (digital signal processor).Described mainboard is provided with RS232 chip and RS232 interface, and described RS232 chip is connected with the MCU unit, and described RS232 interface is connected with the RS232 chip.Described storage unit is RAM and FLASH.Described probe is provided with four electrodes.Described electrode is a platinum electrode.The front end of described probe is provided with a right cylinder, and described four electrodes are located at cylindrical outside surface respectively.The front end of described probe is provided with four right cylinders, and described four electrodes are located at four cylindrical front ends respectively.Described four electrodes are located on the same plane of probe front end.Described electrode is rectangle, ellipse, oblong or annular.
Advantage of the present utility model is: the measuring accuracy height, can carry out the measurement of liquid parameter at any time, and be particularly useful for the online detection of viable bacteria concentration in the sweat.
Description of drawings
Accompanying drawing 1 is the structural representation of the utility model main board,
Accompanying drawing 2 is a measuring principle circuit diagram of the present utility model,
Accompanying drawing 3 is the structural representation of tack annular four electrode probes of the present utility model,
Accompanying drawing 4 is the structural representation of oval four electrode probes of tack of the present utility model,
Accompanying drawing 5 is the structural representation of tack oblong four electrode probes of the present utility model,
Accompanying drawing 6 is the structural representation of tack rectangle four electrode probes of the present utility model,
Accompanying drawing 7 is the structural representation of cylinder convex body annulus four electrode probes of the present utility model,
Accompanying drawing 8 is the structural representation of needle-like four electrode probes of the present utility model.
Embodiment
The utility model relates to a kind of device of tracer liquid electrical quantity, comprise mainboard 1, the shell 2 of mainboard 1 outside, be fixed on the clock circuit module 3 on the mainboard 1, the probe 4 that is connected with mainboard 1 by lead, it is characterized in that: mainboard 1 is provided with MCU unit 5, and (the MCU full name is Micro Controller Unit, Chinese is a micro-control unit, claim one chip microcomputer again), storage unit 6, Voltage stabilizing module 7, power interface 8, temperature measurement module 9, waveform generator 10, isolating transformer module 11, storage unit 6 is connected with MCU unit 5, temperature measurement module 9 is connected with MCU unit 5, power interface 8 is connected with MCU unit 5 by Voltage stabilizing module 7, MCU unit 5 is successively by waveform generator 10, isolating transformer module 11 is connected with probe 4, mainboard 1 is provided with A/D analog-to-digital conversion module 12, wave filter 13, amplifier 14, MCU unit 5 is connected with wave filter 13 by A/D analog-to-digital conversion module 12, and wave filter 13 is connected with probe 4 by amplifier 14.Described MCU unit 5 can be dsp chip (digital signal processor), and dsp chip can adopt the TMS32C2812 chip with fairly perfect external interface.Described waveform generator 10 is Direct Digital Frequency Synthesizers (DDS), and Direct Digital Frequency Synthesizers can adopt the AD9834 chip, and adds the high speed amplifier and cushion.
Current potential and current signal that probe 4 obtains, in succession by amplifier 14, wave filter 13 and A/D analog-to-digital conversion module 12 enter MCU unit 5, MCU unit 5 passes through according to prior preset program, the output frequency byte is to waveform generator (OSC) 10, produce the sine wave of characteristic frequency and amplitude, deliver to probe 4 parts by an isolating transformer module 11, current return ground connection forms probe---ground system, with main frame---the ground system isolates (part beyond the utility model probe 4 is a main frame), has reduced the disturbing factor that influences measurement result in 4 environment of living in of popping one's head in effectively.
Described mainboard 1 is provided with push-button interface 15 and display screen interface 16, and push-button interface 15 is connected with MCU unit 5 respectively with display screen interface 16.Described shell 2 is provided with button 17, and button 17 is connected with push-button interface 15.Described shell 2 is provided with display screen 18, and display screen 18 is connected with display screen interface 16.Described display screen 18 is LCD display (LCDs).User of the present utility model uses button 17 input instructions, can obtain the data of needs, also can save the data in the storage unit 6.Described storage unit 6 is RAM (random access memory) 19 and FLASH (flash memory) 20.
Because therefore the permittivity of liquid and the function that conductivity is temperature must measure temperature to correct data, the effect of temperature measurement module just is being this.The major function of MCU unit 5 is computing and control, with the data measured with in the data that computing obtains are kept at storage unit 6 or be presented on the external display screen 18.These data can be temperature,
Voltage vector Vx and reference voltage vector Vr can be electric capacity, resistance, specific inductive capacity and conductivity, also can be through the users' expectation after the more complicated specific program computing such as water percentage, viable bacteria concentration, ion concentration etc.Design concept of the present utility model is as follows: when electric current passed through external electrode inflow and outflow liquid, electrode surface can form electrode polarization, produced polarization impedance Zp1 and Zp2.Frequency is low more, and polarization impedance is big more, and common polarization impedance will be obviously greater than fluid impedance when 1MHz is following.Therefore, can not think that the current potential on the external electrode is exactly the current potential on the liquid this moment, and electrode in needing to use a pair, avoid polarization impedance and directly obtain current potential on the liquid.Only under some special situation, in purity very high water or organic solvent, just can in electrode and only use pair of electrodes to measure.When using four electrodes, interior electrode can obtain the liquid voltage characteristic, according to Ohm law Z=V/I, also needs the current characteristics of liquid, and this can connect with liquid by a reference resistance Rr and obtain.Voltage vector is Vx on the sample if interior electrode records, and by current phasor I, the voltage vector on the reference impedance is Vr in the sample.Because therefore polarization impedance, sample, reference resistance series connection have:
Then the sample impedance can be expressed as:
By
:
Then:
Therefore, only need can be in real time accurately measuring voltage vector V x and reference voltage vector Vr, can obtain sample impedance Z x to be measured in conjunction with demarcating reference impedance Rr well in advance.
Described mainboard 1 is provided with RS232 chip 21 and RS232 interface 22, and described RS232 chip 21 is connected with MCU unit 22, and described RS232 interface 22 is connected with RS232 chip 21.RS232 chip 21 and RS232 interface 22 make things convenient for the utility model to exchange with the data in the external world, are convenient to make the application of the utility model in automatic control system.
Described probe 4 is provided with four electrodes 23.The position relation of four electrodes 23 on the described probe 4 mainly contains following four kinds.
Described probe 4 is a right cylinder, and described four electrodes 23 can be located at cylindrical outside surface respectively.
The front end of described probe 4 is provided with four right cylinders, and described four electrodes 23 are located at four cylindrical front ends respectively.
The front end of described probe 4 is a plane, and described four electrodes 23 are located on the same plane of probe front end, and described electrode 23 can be rectangle, ellipse, oblong or annular.
Claims (18)
1. the device of a tracer liquid electrical quantity, comprise mainboard, the shell of mainboard outside, be fixed on the clock circuit module on the mainboard, the probe that is connected with mainboard by lead, it is characterized in that: mainboard is provided with the MCU unit, storage unit, Voltage stabilizing module, power interface, temperature measurement module, waveform generator, the isolating transformer module, storage unit is connected with the MCU unit, temperature measurement module is connected with the MCU unit, power interface is connected with the MCU unit by Voltage stabilizing module, the MCU unit passes through waveform generator successively, the isolating transformer module is connected with probe, mainboard is provided with the A/D analog-to-digital conversion module, wave filter, amplifier, the MCU unit is connected with wave filter by the A/D analog-to-digital conversion module, and wave filter is connected with probe by amplifier.
2. the device of a kind of tracer liquid electrical quantity as claimed in claim 1 is characterized in that: described mainboard is provided with push-button interface and display screen interface, and push-button interface is connected with the MCU unit respectively with display screen interface.
3. the device of a kind of tracer liquid electrical quantity as claimed in claim 2 is characterized in that: described shell is provided with button, and button is connected with push-button interface.
4. the device of a kind of tracer liquid electrical quantity as claimed in claim 2 is characterized in that: described shell is provided with display screen, and display screen is connected with display screen interface.
5. the device of a kind of tracer liquid electrical quantity as claimed in claim 4 is characterized in that: described display screen is a LCD display.
6. the device of a kind of tracer liquid electrical quantity as claimed in claim 1 is characterized in that: described waveform generator (OSC) is a Direct Digital Frequency Synthesizers (DDS).
7. the device of a kind of tracer liquid electrical quantity as claimed in claim 1 is characterized in that: described MCU unit can be dsp chip.
8. the device of a kind of tracer liquid electrical quantity as claimed in claim 1 is characterized in that: described mainboard is provided with RS232 chip and RS232 interface, and described RS232 chip is connected with the MCU unit, and described RS232 interface is connected with the RS232 chip.
9. the device of a kind of tracer liquid electrical quantity as claimed in claim 1 is characterized in that: described storage unit is RAM and FLASH.
10. the device of a kind of tracer liquid electrical quantity as claimed in claim 1 is characterized in that: described probe is provided with four electrodes.
11. the device of a kind of tracer liquid electrical quantity as claimed in claim 10 is characterized in that: the front end of described probe is provided with a right cylinder, and described four electrodes are located at cylindrical outside surface respectively.
12. the device of a kind of tracer liquid electrical quantity as claimed in claim 10 is characterized in that: the front end of described probe is provided with four right cylinders, and described four electrodes are located at four cylindrical front ends respectively.
13. the device of a kind of tracer liquid electrical quantity as claimed in claim 10 is characterized in that: described four electrodes are located on the same plane of probe front end.
14. the device of a kind of tracer liquid electrical quantity as claimed in claim 13 is characterized in that: described electrode is rectangle, ellipse, oblong or annular.
15. the device as each described a kind of tracer liquid electrical quantity among the claim 10-14 is characterized in that: the junction of described electrode and probe is provided with stationary installation.
16. the device of a kind of tracer liquid electrical quantity as claimed in claim 15 is characterized in that: described stationary installation is an insulator.
17. the device of a kind of tracer liquid electrical quantity as claimed in claim 15 is characterized in that: described stationary installation is pottery.
18. the device as each described a kind of tracer liquid electrical quantity among the claim 10-14 is characterized in that: described electrode is gold electrode, platinum electrode or gold-plated electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200570503U CN201226003Y (en) | 2008-04-08 | 2008-04-08 | Apparatus for detecting liquid electrical parameter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200570503U CN201226003Y (en) | 2008-04-08 | 2008-04-08 | Apparatus for detecting liquid electrical parameter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201226003Y true CN201226003Y (en) | 2009-04-22 |
Family
ID=40598898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200570503U Expired - Fee Related CN201226003Y (en) | 2008-04-08 | 2008-04-08 | Apparatus for detecting liquid electrical parameter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201226003Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106371150A (en) * | 2016-08-31 | 2017-02-01 | 上海太弘威视安防设备有限公司 | Hazardous liquid detecting instrument based on DDS |
| CN112014298A (en) * | 2020-10-22 | 2020-12-01 | 广州大学 | Mold monitoring device, method and system based on weak electric signals |
-
2008
- 2008-04-08 CN CNU2008200570503U patent/CN201226003Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106371150A (en) * | 2016-08-31 | 2017-02-01 | 上海太弘威视安防设备有限公司 | Hazardous liquid detecting instrument based on DDS |
| CN112014298A (en) * | 2020-10-22 | 2020-12-01 | 广州大学 | Mold monitoring device, method and system based on weak electric signals |
| CN112014298B (en) * | 2020-10-22 | 2021-03-16 | 广州大学 | Mold monitoring device, method and system based on weak electric signals |
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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: 20090422 Termination date: 20100408 |