CN107543952A - The method for measuring Weak current in the loop of electrical body and solution composition in solution - Google Patents
The method for measuring Weak current in the loop of electrical body and solution composition in solution Download PDFInfo
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- CN107543952A CN107543952A CN201610486960.2A CN201610486960A CN107543952A CN 107543952 A CN107543952 A CN 107543952A CN 201610486960 A CN201610486960 A CN 201610486960A CN 107543952 A CN107543952 A CN 107543952A
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Abstract
The invention discloses a kind of method for measuring Weak current in the loop of electrical body and solution composition in solution, comprise the following steps：The wire connected in tested loop into a variable resistance or as variable resistor, one voltmeter of parallel connection on variable resistance or wire as variable resistor, the magnitude of voltage at acquisition variable resistor silk both ends；Micro-current value on electrical body is obtained according to calculation formula, calculation formula is as follows：I1=VR/R2；Wherein, I1It is the micro-current value on electrical body, VRIt is variable resistance or the magnitude of voltage at the wire both ends as variable resistor, R2It is the resistance value of variable resistance or the wire as variable resistor.This method can measure the Weak current that the small electrical potential difference of electrical body in water is formed.
Description
Technical field
It is more particularly to a kind of to measure electrical body and solution composition in solution the present invention relates to micro current technical field
The method of Weak current in loop.
Background technology
In technical research and development, it is often necessary to some very small electric signals are measured, for example, in certain physics
Under electrochemical conditions, the electric current of very small (microampere) that one extremely low resistive conductor of measurement passes through, or even simply discriminated whether electricity
Signal produces.On the other hand, in actual production, it is also desirable to measure some small electrical signals using sensor.
But in the prior art, due to being related in circuit using water or solution as a part for conductor in loop and
When the resistance of non-water section is very small, the measurement of electric current is extremely difficult.Such as bipolar electrochemical (Bipolar
Electrochemistry in), it is that electric field is placed in water or solution, elemental metals is then put into electric field in water or solution
It is interior, so as to form electrical potential difference on elemental metals surface；This electrical potential difference in metal surface formation is very small, it is difficult to measures.
For another example inventor is in differentiation simultaneously in the electrical potential difference phenomenon on the monometallic surface for the ultraviolet induction for applying for patent of invention
Not no when having electrical potential difference, in general measuring method can not measure differentiation.
The content of the invention
The technical problem to be solved in the present invention is to provide micro- in the loop of electrical body and solution composition in a kind of measurement solution
The method of low current, the Weak current that the small electrical potential difference of electrical body in water is formed can be measured.
In order to solve the above-mentioned technical problem, technical scheme is as follows：
In a kind of measurement solution in the loop of electrical body and solution composition Weak current method, comprise the following steps：
S1, connected in tested loop into a variable resistor, form measuring loop；
S2, a voltmeter in parallel on variable resistor, obtain the magnitude of voltage at variable resistor both ends；
S3, the micro-current value on electrical body obtained according to calculation formula, calculation formula is as follows：
I1=VR/R2
Wherein, I1It is the micro-current value on electrical body, VRIt is the magnitude of voltage at variable resistor both ends, R2It is the electricity of variable resistor
Resistance.
Further, in step S1, the variable resistor can be the variable resistance or difference of electronic device
The wire of length.
Further, in step S2, after the wire as variable resistor is connected with electrical body, can partly or entirely submerge
In the solution.
Further, in step S3, change the resistance of variable resistance or change the length of wire, obtain multigroup difference
Resistance value R2And corresponding magnitude of voltage VR；According to multigroup different resistance value R2And corresponding magnitude of voltage VR, establish
Magnitude of voltage VRWith resistance value R2Linear Regression Model in One Unknown, obtain electrical body from the regression coefficient of Linear Regression Model in One Unknown
On micro-current value I1。
Using above-mentioned technical proposal, due to using the powered of variable resistance or the wire as variable resistor and solution
Body is connected in series because variable resistance or as variable resistor wire resistance value well below solution resistance value,
Again and the solution series a part of as loop, because the resistance value of solution is very big simultaneously, electric current in loop by solution electricity
Resistance determines that is, current value is constant.Then, the magnitude of voltage at variable resistance (or wire as variable resistor) both ends by
The resistance value of variable resistance determines according to Ohm's law, it is therefore possible for the detected that voltage divided by resistance value be exactly the electric current to be surveyed
Value.In order to improve measurement accuracy, (or it can change by changing the resistance value of variable resistance and be used as the wire of variable resistor
Length), obtain multigroup different data, the measurement accuracy improved using Linear Regression Model in One Unknown, measurement range low can be arrived
About 0.01 μ A.
Brief description of the drawings
Fig. 1 is the equivalent circuit diagram of circuit-under-test in the present invention；
Fig. 2 is the equivalent circuit diagram of the measuring circuit in the present invention；
Fig. 3 is the measuring method experimental rig structure chart in the present invention；
Fig. 4 is the one-variable linear regression figure of measurement result；
In figure, 100- is tested loop, 1- reaction vessels, 2- water, 3- installation support plates, 4- uviol lamps, the light barriers of 5- first, 6-
Second light barrier, the upper copper wire circles of 7-, copper wire circle under 8-, 9- nickel wires, 10- voltmeters.
Embodiment
The embodiment of the present invention is described further below in conjunction with the accompanying drawings.Herein it should be noted that for
The explanation of these embodiments is used to help understand the present invention, but does not form limitation of the invention.It is in addition, disclosed below
As long as each embodiment of the invention in involved technical characteristic do not form conflict can each other and be mutually combined.
In a kind of measurement solution in electrical body Weak current method, comprise the following steps：
S1, a variable resistor of being connected in tested loop, form measuring loop；
S2, a voltmeter in parallel on variable resistor, obtain the magnitude of voltage at variable resistor both ends；
S3, the micro-current value on electrical body obtained according to calculation formula, calculation formula is as follows：
I1=VR/R2
Wherein, I1It is the micro-current value on electrical body, VRIt is the magnitude of voltage at variable resistor both ends, R2It is the electricity of variable resistor
Resistance.
Wherein, in step S1, variable resistor can be the variable resistance of electronic device or the gold of different length
Belong to silk.
Wherein, in step S1 as variable resistor wire can be unit length the constant wire of resistance value；
The wire is metal nickel wire, but is not limited to nickel wire.
Wherein, in step S2 as can power transformation wire be connected with electrical body after, can partly or entirely be immersed in solution
In；Variable resistance is such as used, it is not submerged in water.
Wherein, in step S3, change resistor or change wire length, obtain multigroup different resistance value R2With
And corresponding magnitude of voltage VR；According to multigroup different resistance value R2And corresponding magnitude of voltage VR, establish magnitude of voltage VRWith electricity
Resistance R2Linear Regression Model in One Unknown, the micro-current value on electrical body is obtained from the regression coefficient of Linear Regression Model in One Unknown
I1。
Wherein, I1It is the micro-current value on electrical body, VRIt is the magnitude of voltage at variable resistor both ends, R2It is variable resistance.
As shown in figure 1, being full of water 2 or other solution in reaction vessel 1, tested loop 100 is equivalent to a closed circuit,
Resistance R including being tested solution in loop1, it is tested non-water resistance R in the solution in loop0, the small electrical potential difference V on electrical body.
As shown in Fig. 2 disconnecting tested loop, connect a variable resistor R2, voltmeter measurement variable resistor R2The voltage at both ends
Value VR, the equivalent resistance of voltmeter is R3, the micro-current being tested in loop is I1, pass through variable resistor R2Electric current be I2, pass through
The electric current of voltmeter is I3, it is clear that R1>>R0, R1>>R2, R3>>R2, and I2>>I3, therefore：
VR=I2×R2≈(I2+I3)×R2=I1×R2 (2)
So as to the micro-current I in tested loop1=VR/R2。
As shown in figure 3, the device of the measuring method for verifying the present invention is as follows：Including uviol lamp 4, copper coil, water 2 with
And volt instrument 10, uviol lamp 4 are arranged on installation support plate 3, install and a reaction vessel 1 is set below support plate 3, in reaction vessel 1
Full of water 2, installation support plate 3 surface relative with reaction vessel 1 is provided with light hole, and the ultraviolet wavelength of uviol lamp 4 is
245nm, uviol lamp 4 are radiated at the upper copper wire circle 7 in water by light hole, are provided with the first light barrier 5 on light hole, are used for
The upper copper wire circle 7 of open and close ultraviolet irradiation；Upper copper wire circle 7 is arranged on the upper surface of the second light barrier 6, the following table of the second light barrier 6
Face is provided with lower copper wire circle 8, and upper copper wire circle 7 and the lower disk of copper wire circle 8 reticulate, and the end of upper copper wire circle 7 and lower copper wire circle 8 is with one
Nickel wire 9 is connected, and voltmeter is arranged in parallel near two ends of nickel wire 9.
During experiment, 254nm uviol lamp is always on, removes the first light barrier 5, ultraviolet light in upper copper wire circle 7,
Electrical potential difference can be produced between upper copper wire circle 7 and lower copper wire circle 8, tested loop is formed by water and other non-aqueous conductors；Experiment
In nickel wire 9 is connected between upper copper wire circle 7 and lower copper wire circle 8, composition is equivalent to other non-aqueous conductors in tested loop.Nickel wire 9
Variable resistor R2The size of resistance value determined by its length, it is assumed that the resistance value of the nickel wire of unit length is Rm, then R2
=L × Rm, wherein L is the length of nickel wire.
Change the length L of nickel wire, read voltmeter VRNumerical value corresponding to upper, (L, VR) include (0,0), (385,0.13),
(780,0.20), (1165,0.40), Linear Regression Model in One Unknown is established based on above-mentioned four groups of data, as shown in figure 4,
VR=0.0003L-0.0075,
Pass through R2=L × RmObtain R2Value, pass through I1=VR/R2Obtain the micro-current value in tested loop.
Linear regression curves can help to study, situation when detecting non-water resistance very small (close to 0)；According to recurrence
Coefficient determines whether that linear relation analysis judges the electric signal principle of complex situations, or determines whether electric signal.
Embodiments of the present invention are explained in detail above in association with accompanying drawing, but the invention is not restricted to described implementation
Mode.For a person skilled in the art, in the case where not departing from the principle of the invention and spirit, to these embodiments
A variety of change, modification, replacement and modification are carried out, are still fallen within protection scope of the present invention.
Claims (6)
- A kind of 1. method for measuring Weak current in the loop of electrical body and solution composition in solution, it is characterised in that including with Lower step：S1, connected in tested loop into a variable resistor, form measuring loop；S2, a voltmeter in parallel on the variable resistor, obtain the magnitude of voltage at the variable resistor both ends；S3, the micro-current value on electrical body obtained according to calculation formula, calculation formula is as follows：I1=VR/R2Wherein, I1It is the micro-current value on electrical body, VRIt is the magnitude of voltage at variable resistor both ends, R2It is the resistance value of variable resistor.
- A kind of 2. side for measuring Weak current in the loop of electrical body and solution composition in solution according to claim 1 Method, it is characterised in that in the step S1, the variable resistor is the wire of variable resistance or different length.
- A kind of 3. side for measuring Weak current in the loop of electrical body and solution composition in solution according to claim 2 Method, it is characterised in that in the step S2, after the wire is connected with electrical body, the part or all of leaching of the wire Not in the solution.
- 4. small electric in the loop of electrical body and solution composition in a kind of measurement solution according to claim any one of 2-3 The method of stream, it is characterised in that in the step S3, change the resistance of the variable resistance or change the length of the wire Degree, obtain multigroup different resistance value R2And corresponding magnitude of voltage VR；According to multigroup different resistance value R2It is and corresponding Magnitude of voltage VR, establish magnitude of voltage VRWith resistance value R2Linear Regression Model in One Unknown, from the recurrence system of Linear Regression Model in One Unknown The micro-current value I on electrical body is obtained in number1。
- A kind of 5. side for measuring Weak current in the loop of electrical body and solution composition in solution according to claim 2 Method, it is characterised in that the wire is the constant wire of the resistance value of unit length.
- A kind of 6. side for measuring Weak current in the loop of electrical body and solution composition in solution according to claim 5 Method, it is characterised in that the wire is metal nickel wire.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613430A (en) * | 2019-02-18 | 2019-04-12 | 内蒙古伊泰准东铁路有限责任公司 | Electric current determines method and device |
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| CN102116757A (en) * | 2009-12-30 | 2011-07-06 | 上海城投原水有限公司 | Electrical conductivity measurement system and method for liquid |
| CN103424629A (en) * | 2013-07-25 | 2013-12-04 | 同济大学 | Simple method for testing impedance of graphene oxide solution |
| CN104316776A (en) * | 2014-10-11 | 2015-01-28 | 深圳市开天源自动化工程有限公司 | Electromagnetic wave measuring method |
| CN104330153A (en) * | 2014-10-11 | 2015-02-04 | 深圳市开天源自动化工程有限公司 | Method for measuring intensity of ultraviolet light |
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2016
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101587150A (en) * | 2006-08-30 | 2009-11-25 | 梅特勒-托利多仪器（上海）有限公司 | Solution conductivity measuring method |
| CN102116757A (en) * | 2009-12-30 | 2011-07-06 | 上海城投原水有限公司 | Electrical conductivity measurement system and method for liquid |
| CN103424629A (en) * | 2013-07-25 | 2013-12-04 | 同济大学 | Simple method for testing impedance of graphene oxide solution |
| CN104316776A (en) * | 2014-10-11 | 2015-01-28 | 深圳市开天源自动化工程有限公司 | Electromagnetic wave measuring method |
| CN104330153A (en) * | 2014-10-11 | 2015-02-04 | 深圳市开天源自动化工程有限公司 | Method for measuring intensity of ultraviolet light |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613430A (en) * | 2019-02-18 | 2019-04-12 | 内蒙古伊泰准东铁路有限责任公司 | Electric current determines method and device |
| CN109613430B (en) * | 2019-02-18 | 2021-06-01 | 内蒙古伊泰准东铁路有限责任公司 | Current determination method and device |
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Application publication date: 20180105 |