CN109870487A - A kind of calibrating conductor resistance compensation method of conductivity sensor and device and system - Google Patents
A kind of calibrating conductor resistance compensation method of conductivity sensor and device and system Download PDFInfo
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Abstract
The invention discloses a kind of calibrating conductor resistance compensation method of conductivity sensor and device and system, it is related to sensor calibrating field, wherein, a kind of conductivity sensor calibrating conductor resistance compensation method, comprising: determine or input the resistance delta caused by conducting wire that is connected with alternating current-direct current resistance box and conductivity sensor；Detect the corresponding current value of adjusting resistance value of the alternating current-direct current resistance box of the conductivity sensor output；The resistance delta, the adjusting resistance value and the current value are sent to computing unit；The resistance delta is added by the computing unit with the adjusting resistance value, to obtain practical access resistance, and utilizes the practical practical access resistance conversion current value of access resistance calculations.To solve conducting wire itself there is resistance value, and it is corresponding calibrating is influenced when resistance box accesses resistance value very little big, and due to conductor resistance very little, the calibrating of conductivity sensor can only be examined and determine manually, it is difficult to the problem of realizing automatic Verification.
Description
Technical field
The present invention relates to sensors to examine and determine field, and specifically a kind of conductivity sensor examines and determine conductor resistance compensation method
And device and system.
Background technique
Conductivity sensor is the habit call on well logging, should actually be referred to as conductivity transmitter, for measuring drilling well mud
Starching conductivity is mainly to measure the salinity of mud, and the sensor of use is inductive conductivity.Its measuring principle is using original
Grade and secondary two magnet ring windings are installed on the same axis side by side, and simple winding is transmitting coil, and secondary windings is to receive line
Circle.When sensor heads hole incudes and having the drilling fluid of certain conductive capability, 20Hz is connected in original grade coil in this way
Alternating current when, the alternating flux in original grade coil magnet ring can make by sensor heads hole to make that closed state is presented
Drilling fluid generates alternating current.The alternating current also generates alternating magnetic field simultaneously, this alternating magnetic field induces secondary coil again
Alternating potential.The alternating potential signal that secondary induction goes out sends out the detection signal of conductivity parameters after processing of circuit.Sensor
Inside has integrated temperature sensor (thermistor), for monitoring the temperature of drilling fluid, to drilling fluid under dut temperature
Conductivity carries out temperature correction, and conductivity value at 25 DEG C of the drilling fluid is arrived in compensation.Conductivity transmitter to sensor signal into
Row shaping, enhanced processing, output 4~20mA corresponding with conductivity standard DC current signal.Such as SK-8D08 conductivity
The models such as sensor.
Conductivity sensor needs to carry out periodic verification according to measurement Law, metering codes and standards.According to conductivity sensors
Device working principle is it is found that apply different load resistances to sensor, and sensor exports different current signals, therefore load resistance
Using standard resistance box (0.01 Ω~10k Ω), current output sensor is measured with precision ammeter.
The resistance of access and the electromotive force relationship of conductivity sensor output are recorded according to reason, directly by computer disposal
Data are run a curve, and evaluation result can be provided.
And critical issue is to need to solve the conducting wire of access resistance box itself there is resistance value, and corresponding in resistance box
Calibrating is influenced when accessing resistance value very little very big.
Due to conductor resistance very little, the calibrating of conductivity sensor can only be examined and determine manually, it is difficult to realize automatic Verification
Etc. reasons, domestic existing calibrating installation processing is not modified to conductor resistance value now.
Summary of the invention
In view of this, the present invention provides a kind of calibrating conductor resistance compensation method of conductivity sensor and device and system,
To solve conducting wire itself, there is resistance values, and correspond to, Yi Jiyou big on calibrating influence when resistance box accesses resistance value very little
It can only manually be examined and determine in the calibrating of conductor resistance very little, conductivity sensor, it is difficult to the problem of realizing automatic Verification.
In a first aspect, the present invention provides a kind of conductivity sensor calibrating conductor resistance compensation method, comprising:
Determine or input the resistance delta caused by conducting wire that is connected with alternating current-direct current resistance box and conductivity sensor；
Detect the corresponding current value of adjusting resistance value of the alternating current-direct current resistance box of the conductivity sensor output；
The resistance delta, the adjusting resistance value and the current value are sent to computing unit；The computing unit
The resistance delta is added with the adjusting resistance value, to obtain practical access resistance, and utilizes the practical access electricity
Resistance calculates practical access resistance conversion current value.
Preferably, before sending the resistance delta, the adjusting resistance value and the current value to computing unit,
The gear resistance value for determining the adjusting resistance of the alternating current-direct current resistance box, according to the gear resistance value of the adjusting resistance value and its
The relationship of corresponding current value, to several interval divisions of carry out of adjusting resistance value；
The resistance delta, the gear resistance value and the current value are sent to the computing unit.
Preferably, a kind of conductivity sensor examines and determine conductor resistance compensation method, and the computing unit is by the electricity
Resistance increment is added with the adjusting resistance value, the method to obtain practical access resistance, comprising:
The interval endpoint in several sections is judged, if the interval endpoint is greater than section setting value, the adjusting electricity
Resistance value is the practical access resistance, and the practical access resistance is sent to the computing unit.
Preferably, a kind of conductivity sensor examines and determine conductor resistance compensation method, further includes:
Obtain precision as defined in the conductivity sensor；
Calculate the relative error of practical access resistance the conversion current value and the current value；
If the relative error is less than or equal to the defined precision, judge that the conductivity sensor is qualified；
Otherwise, judge that the conductivity sensor is unqualified.
Second aspect, the present invention provide a kind of conductivity sensor calibrating conductor resistance compensation device, comprising:
Determination unit is connected caused by conducting wire for determining or inputting with alternating current-direct current resistance box and conductivity sensor
Resistance delta；
Detection unit, it is corresponding for detecting the adjusting resistance value of alternating current-direct current resistance box of the conductivity sensor output
Current value；
Transmission unit, the transmission unit is connect with the determination unit and the detection unit respectively, for sending
Resistance delta, the adjusting resistance value and the current value are stated to computing unit；
The computing unit, for the resistance delta to be added with the adjusting resistance value, to obtain practical access electricity
Resistance, and utilize the practical practical access resistance conversion current value of access resistance calculations.
Preferably, a kind of conductivity sensor examines and determine conductor resistance compensation device, further includes:
Gear resistance value determination unit is sending the resistance delta, the adjusting resistance value and the current value extremely
Before computing unit, the gear resistance value of the adjusting resistance of the alternating current-direct current resistance box is determined；
Interval division unit, the pass of the current value corresponding for the gear resistance value according to the adjusting resistance value
System, to several interval divisions of carry out of adjusting resistance value；
It is single to the calculating that the transmission unit sends the resistance delta, the gear resistance value and the current value
Member.
Preferably, the interval division unit, comprising:
Judging unit, for judging the interval endpoint in several sections, if the interval endpoint is greater than section setting value,
Then the adjusting resistance value is the practical access resistance.
Preferably, a kind of conductivity sensor examines and determine conductor resistance compensation device, further includes:
Acquiring unit and relative error computing unit；
The acquiring unit, for obtaining precision as defined in the conductivity sensor；
It is described that error calculation unit is connect with the acquiring unit, for calculating the practical access resistance conversion electric current
The relative error of value and the current value；
Described further includes precision judging unit to error calculation unit, if the relative error is less than or equal to described
Defined precision, then the precision judging unit judges that the conductivity sensor is qualified；Otherwise, the precision judging unit is sentenced
The conductivity sensor that breaks is unqualified.
Preferably, a kind of conductivity sensor examines and determine conductor resistance compensation device, further includes:
Slave computer and host computer；
The slave computer, comprising: the determination unit, the detection unit and the transmission unit；
The host computer, comprising: the computing unit.
The slave computer, for determining the resistance caused by conducting wire that is connected with alternating current-direct current resistance box and conductivity sensor
The corresponding current value of adjusting resistance value for the alternating current-direct current resistance box that increment, the detection conductivity sensor export and transmission institute
Resistance delta, the adjusting resistance value and the current value are stated to the host computer；
The resistance delta is added by the host computer with the adjusting resistance value, to obtain practical access resistance, and
Utilize the practical practical access resistance conversion current value of access resistance calculations.
The third aspect, the present invention provide a kind of conductivity sensor calibrating conductor resistance compensation system, comprising:
Such as a kind of above-mentioned conductivity sensor calibrating conductor resistance compensation method；Or
Such as a kind of above-mentioned conductivity sensor calibrating conductor resistance compensation device.
The present invention at least has the following beneficial effects:
The present invention provides a kind of calibrating conductor resistance compensation method of conductivity sensor and device and system, to solve conducting wire
Itself there is resistance value, and it is corresponding calibrating is influenced when resistance box accesses resistance value very little it is big, and due to conductor resistance
The calibrating of very little, conductivity sensor can only be examined and determine manually, it is difficult to the problem of realizing automatic Verification.
Detailed description of the invention
By the description below with reference to attached drawing to the embodiment of the present invention, the above and other purposes of the present invention, feature and
Advantage is apparent, in the accompanying drawings:
Fig. 1 is a kind of flow diagram of conductivity sensor calibrating conductor resistance compensation method of the embodiment of the present invention；
Fig. 2 is a kind of schematic diagram of conductivity sensor calibrating conductor resistance compensation device of the embodiment of the present invention；
Fig. 3 is the transmission list of a kind of conductivity sensor calibrating conductor resistance compensation method of the embodiment of the present invention or device
First schematic diagram；
Fig. 4 is conductivity sensor calibrating resistance value-current curve of the embodiment of the present invention.
Specific embodiment
Below based on embodiment, present invention is described, but it is worth noting that, the present invention is not limited to these realities
Apply example.It is detailed to describe some specific detail sections below in datail description of the invention.However, for not detailed
The present invention can also be understood completely in the part described to the greatest extent, those skilled in the art.
In addition, it should be understood by one skilled in the art that provided attached drawing simply to illustrate that the purpose of the present invention,
Feature and advantage, attached drawing are not to be actually drawn to scale.
Meanwhile unless the context clearly requires otherwise, "include", "comprise" etc. otherwise throughout the specification and claims
Similar word should be construed as the meaning for including rather than exclusive or exhaustive meaning；That is, being " including but not limited to "
Meaning.
Fig. 1 is a kind of flow diagram of conductivity sensor calibrating conductor resistance compensation method of the embodiment of the present invention.Such as
Shown in Fig. 1, a kind of conductivity sensor calibrating conductor resistance compensation method, comprising: step S101 determination or input and alternating current-direct current
Resistance box is connected resistance delta caused by conducting wire with conductivity sensor；Step S102 detects conductivity sensor output
The corresponding current value of the adjusting resistance value of alternating current-direct current resistance box；Step S103 sends resistance delta, adjusting resistance value and electric current
It is worth to computing unit；Resistance delta is added by step S104 computing unit with adjusting resistance value, to obtain practical access resistance, with
And utilize the practical access resistance conversion current value of practical access resistance calculations.To solve conducting wire itself, there is resistance values, and
It is corresponding that calibrating is influenced greatly, and due to conductor resistance very little, the inspection of conductivity sensor when resistance box accesses resistance value very little
Surely it can only manually examine and determine, it is difficult to the problem of realizing automatic Verification.In a kind of calibrating conductor resistance compensation of conductivity sensor
In method, those skilled in the art can better understand the present invention in conjunction with the explanation of Fig. 2 and Fig. 3.
In Fig. 1, before sending resistance delta, adjusting resistance value and current value to computing unit, alternating current-direct current is determined
The gear resistance value of the adjusting resistance of resistance box, according to the pass of the corresponding current value of the gear resistance value of adjusting resistance value
System, to several interval divisions of carry out of adjusting resistance value；Resistance delta, gear resistance value and current value are sent to calculating list
Member.Resistance delta is added by computing unit with adjusting resistance value, to obtain practical access resistance, and utilizes practical access resistance
Calculate practical access resistance conversion current value.
In Fig. 1, resistance delta is added by computing unit with adjusting resistance value, the method to obtain practical access resistance
Are as follows: judge the interval endpoint in several sections, if interval endpoint is greater than section setting value, adjusting resistance value is practical access electricity
Practical access resistance is sent to computing unit by resistance.Such as: section setting value is 9000, and interval endpoint is greater than 9000, then adjusts electricity
Resistance value is the practical access resistance, therefore adds 0.
In Fig. 1, a kind of conductivity sensor calibrating conductor resistance compensation method, further includes: obtain conductivity sensor
Defined precision；Calculate the relative error of practical access resistance conversion current value and current value；If relative error is less than or waits
In defined precision, then conductivity sensor qualification is judged；Otherwise, judge that conductivity sensor is unqualified.That is, opposite
Error is less than or equal to precision as defined in conductivity sensor 16, then it is assumed that and 16 precision of conductivity sensor is qualified, otherwise it is assumed that
16 precision of conductivity sensor is unqualified.Such as: the precision of conductivity sensor 16 is 0.5%, and relative error is less than or equal to
The precision 0.5% of conductivity sensor 16, then it is assumed that 16 precision of conductivity sensor is qualified, otherwise it is assumed that conductivity sensor 16
Precision 0.5% it is unqualified.
In Fig. 1, the adjusting resistance value of alternating current-direct current resistance box can be set by setting resistance value, adjusting resistance value
Should be equal with setting resistance value, if adjusting resistance value is equal with setting resistance value, just send adjusting resistance value and setting electricity
Resistance value；If needing progress adjustment setting resistance value when adjusting resistance value and unequal setting resistance value, until adjusting resistance value and
Adjusting resistance value and setting resistance value are just sent when setting resistance value is equal.In the present invention, because of adjusting resistance value and setting
Resistance value is equal, therefore send unit, and transmission unit is connect with determination unit and detection unit respectively, for send resistance delta,
Adjusting resistance value and current value are to computing unit；Computing unit, for resistance delta to be added with adjusting resistance value, to obtain
Reality access resistance, and utilize the practical access resistance conversion current value of practical access resistance calculations.
Fig. 2 is a kind of schematic diagram of conductivity sensor calibrating conductor resistance compensation device of the embodiment of the present invention.
Fig. 3 is the transmission list of a kind of conductivity sensor calibrating conductor resistance compensation method of the embodiment of the present invention or device
First schematic diagram.As shown in Figures 2 and 3, a kind of conductivity sensor examines and determine conductor resistance compensation device, comprising: determination unit is used
In determination or input the resistance delta caused by conducting wire that is connected with alternating current-direct current resistance box and conductivity sensor；Detection unit,
For detecting the corresponding current value of adjusting resistance value of the alternating current-direct current resistance box of conductivity sensor output；Transmission unit is sent
Unit is connect with determination unit and detection unit respectively, for sending resistance delta, adjusting resistance value and current value to calculating
Unit；Computing unit to obtain practical access resistance, and utilizes reality for being added resistance delta with adjusting resistance value
Access the practical access resistance conversion current value of resistance calculations.
In figure 2 and figure 3, a kind of conductivity sensor examines and determine conductor resistance compensation device, further includes: gear resistance value is true
Order member determines the tune of alternating current-direct current resistance box before sending resistance delta, adjusting resistance value and current value to computing unit
The gear resistance value of economize on electricity resistance；Interval division unit, the electric current corresponding for the gear resistance value according to adjusting resistance value
The relationship of value, to several interval divisions of carry out of adjusting resistance value；Transmission unit sends resistance delta, gear resistance value and electricity
Flow valuve is to computing unit.
In figure 2 and figure 3, interval division unit, comprising: judging unit, for judging the interval endpoint in several sections, if
Interval endpoint is greater than section setting value, then adjusting resistance value is practical access resistance.
In figure 2 and figure 3, a kind of conductivity sensor examines and determine conductor resistance compensation device, further includes: acquiring unit and
Relative error computing unit；Acquiring unit, for obtaining precision as defined in conductivity sensor；To error calculation unit and obtain
Unit connection, for calculating the relative error of the practical conversion of access resistance current value and current value；To error calculation unit, also wrap
Precision judging unit is included, if relative error is less than or equal to defined precision, precision judging unit judges conductivity sensors
Device is qualified；Otherwise, precision judging unit judges that conductivity sensor is unqualified.That is, relative error is less than or equal to electricity
Precision as defined in conductivity sensor 16, then it is assumed that 16 precision of conductivity sensor is qualified, otherwise it is assumed that 16 essence of conductivity sensor
It spends unqualified.Such as: the precision of conductivity sensor 16 is 0.5%, and relative error is less than or equal to conductivity sensor 16
Precision 0.5%, then it is assumed that 16 precision of conductivity sensor is qualified, otherwise it is assumed that the precision of conductivity sensor 16 0.5% does not conform to
Lattice.
In figure 2 and figure 3, a kind of conductivity sensor examines and determine conductor resistance compensation device, further includes: slave computer and upper
Machine；Slave computer, comprising: determination unit, detection unit and transmission unit；Host computer, comprising: computing unit.Slave computer is used for
Determine that the resistance delta caused by conducting wire that is connected with alternating current-direct current resistance box and conductivity sensor, detection conductivity sensor are defeated
The corresponding current value of adjusting resistance value and transmission resistance delta, adjusting resistance value and current value of alternating current-direct current resistance box out
To host computer；Resistance delta is added by host computer with adjusting resistance value, to obtain practical access resistance, and utilizes practical access
The practical access resistance conversion current value of resistance calculations.
In figure 2 and figure 3, as highly preferred embodiment of the present invention, and a kind of calibrating of conductivity sensor is led
Line resistance compensation method and apparatus are further described: due to selecting the alternating current-direct current resistance box 1 of mechanical standard to be used as standard
Source element causes conductivity sensor to it is also difficult to achieve automatic Verification to adapt to the data calibration of conductivity specified point.For
This, we devise calibrating installation, include: host computer, upper computer software and device hardware.And device hardware includes resistance value record
Enter display table 12, electric current display table 14, hub 17, central control unit 18, confirmation send button 10, WIFI serial ports transparent transmission mould
Block 8 etc..
In figure 2 and figure 3, standard alternating current-direct current resistance box 1 examines and determine measuring standard component as conductivity sensor 16,
It examines and determine resistance box and uses standard alternating current-direct current resistance box (0.01 Ω~10k Ω), point six knobs respectively correspond × 0.001, ×
0.01, × 0.1, × 1, × 10, × 100, × 1000 grades.It is passed through by a terminal-connecting lead 2 of alternating current-direct current resistance box 1
The inductance loop 3 of conductivity sensor 16 is connected to another binding post of alternating current-direct current resistance box 1, forms closed circuit, and standard is handed over straight
The difference that leakage resistance case 1 accesses resistance value just corresponds to conductivity sensor 16 and exports different current values.
In figure 2 and figure 3, protection metal pipe 4 plays a part of protecting its inner lead, the conductance of conductivity sensor 16
Rate signal conversion circuit 5 is responsible for the conversion of signal, and the resistance signal of DC resistance box 1 is converted to the current signal of 4-20mA,
Power supply power supply and converted output signal are connected on the signal terminal 7 of calibrating case 11 (that is, detection unit) by electric wire 6.Starting electricity
Source switch 8, power supply indicator 9 are lighted, and voltmeter 15 indicates the supply voltage of conductivity sensor.
In figure 2 and figure 3, resistance value typing display table 12 is the instrument shown with six Digital sum pipes, is needed artificial defeated
Enter the indicating value of six driver plates on corresponding alternating current-direct current resistance box 1, that is to say, that resistance value typing shows the setting resistance that table 12 is shown
It is worth identical as the adjusting resistance value of alternating current-direct current resistance box 1.Control calibrating point (that is, the gear resistance value for adjusting resistance), adjustment is handed over
The corresponding resistance value of six each driver plates of standard alternating current-direct current resistance box 1 is input to resistance value typing by the resistance value of DC resistance box 1 one by one
It shows on table 12.Electric current shows that table 14 is connect with signal terminal 7, and electric current shows and obtains after table 14 shows 16 pick-up of conductivity sensor
The current value of the adjusting resistance value arrived, transmission antenna 13 are connected to the WIFI transparent transmission module 8 inside calibrating case 11 (that is, sending single
Member) realize that resistance value typing shows that the setting resistance value of table 12, electric current show that the adjusting resistance value of table 14 is synchronous and send, host computer
(that is, computing unit) receives the setting resistance value for the resistance value typing display table 12 that WIFI transparent transmission module 8 is sent by router
The adjusting resistance value of table 14 is shown with electric current.That is, the adjusting resistance value of alternating current-direct current resistance box is shown by resistance value typing
The setting resistance value of table 12 is set, and adjusting resistance value such as at this time is 1.8 Ω, then resistance value typing shows the setting electricity of table 12
Resistance value is also 1.8 Ω.The adjusting resistance value and setting resistance value of 1.8 Ω is sent to by WIFI transparent transmission module 8 and antenna 13
Position machine.
In figure 2 and figure 3, conductivity sensor 16 is passed through by a terminal-connecting lead 2 of alternating current-direct current resistance box 1
Inductance loop 3 be connected to another binding post of alternating current-direct current resistance box 1, form closed circuit, conductivity sensor 16 exports two wires
The standard DC current signal for making 4~20mA shows table 14 to electric current, while artificially six driver plates on alternating current-direct current resistance box 1
Indicating value typing resistance value typing show that table 12, electric current show that table 14 and resistance value typing show table 12 respectively by respective
The port RS485 is connected on the corresponding terminal of RS485 hub 17, and central control unit 18 uses MSP430F169 core chips
It is connect by RS232 interface with hub 17, hub 17 is controlled by central control unit 18.10 transmissions are sent pressing confirmation
When button, central control unit 18 reads the current value for being connected to and setting resistance value and adjusting resistance value on hub 17, is collecting
Under the coordinated management of middle control unit 18, ready data are sent to WIFI by RS485 interface by central control unit 18
Transparent transmission module 8 is sent by transmission antenna 13.After host computer receives the data information that calibrating case 11 is sent, data are carried out
Resistance delta, i.e., be added by processing with adjusting resistance value, to obtain practical access resistance, and utilizes practical access resistance calculations
Practical access resistance conversion current value.
In figure 2 and figure 3, adjusting resistance value and setting resistance value are sent to by WIFI transparent transmission module 8 and antenna 13
It needs to compare confirmation before the machine of position, if adjusting resistance value is equal with setting resistance value, just confirms that sending 10 sends by pressing
Adjusting resistance value and setting resistance value；If when adjusting resistance value and unequal setting resistance value, needing progress adjustment setting resistance
Value just passes through when adjusting resistance value is equal with setting resistance value and presses 10 transmission adjusting resistance values of confirmation transmission and setting electricity
Resistance value.In the present invention, because adjusting resistance value is equal with setting resistance value, send unit, transmission unit respectively with determination
Unit is connected with detection unit, for sending resistance delta, adjusting resistance value and current value to computing unit；Computing unit,
For resistance delta to be added with adjusting resistance value, to obtain practical access resistance, and it is real using practical access resistance calculations
Resistance conversion current value is accessed on border.
In figure 2 and figure 3, the host computer as receiving end can be industrial personal computer, and industrial personal computer is equipped with wireless router, wirelessly
The data information that router reception device hardware is sent, software finally provide conductivity according to the corresponding data of rule process
The measurement error of sensor determines its accuracy class.
In figure 2 and figure 3, practical calibrating, accesses the difference of the resistance value in inductance loop 3, corresponds to conductivity sensor
The current value of 16 outputs is different.Table 1 gives resistance-current relationship of conductivity sensor standard, and biography is examined and determine according to this table
Sensor.The conductivity sensor model of different manufacturers production may be not quite similar, and data of the parameter also with table 1 have differences,
But corresponding relationship is similar.
Resistance-current data of 1 conductivity sensor standard of table corresponds to table
Fig. 4 is depicted according to the data of table 1.Fig. 4 is conductivity sensor calibrating resistance value-electric current of the embodiment of the present invention
Curve.Fig. 4 is that resistance-current data of 1 conductivity sensor standard of table corresponds to the curve graph of table.Fig. 4 depicts the serial number of table 1
The data of 1-7.According to the relationship of adjusting resistance value and the current value of adjusting resistance value, the carry out section of adjusting resistance value is drawn
Point, from fig. 4, it can be seen that the corresponding adjusting resistance value of serial number 1~7 is 7 gear resistance values in corresponding table 1, that is, correspond to
Six sections, first section are 1.8-2.4, and second section is 2.4-3.6 ... .., and the 6th section is 2.88-9000,.
At corresponding 1.8 Ω of abscissa, after the introducing due to conductor resistance generates resistance delta Δ R, corresponding ordinate current value I
Bigger variable quantity can be generated.For this purpose, can take according to resistance delta Δ R value, positive amendment is carried out at serial number point.
After resistance value is more than 28.8 Ω, the variation of resistance value has influenced not conductivity sensor output current value
Greatly, because conductor resistance value is very little, therefore it can correct or be limited between specific resistance value according to preceding method and be repaired
Just, the section the Ω of 28.8 Ω~100 such as is in 28.8 Ω points to be modified, be inserted into the adjusting point of corresponding 100 Ω of resistance value；Work as electricity
After resistance value is more than 9000 Ω, the resistance of conducting wire has influenced little, can be ignored, does not just have to have modified.
The amendment of conductor resistance value is carried out, using 6 corresponding formula.Corresponding 9000 access resistance, the resistance of conducting wire is
It influences little, can be ignored.
It examines and determine resistance box and uses standard alternating current-direct current resistance box (0.01 Ω~10k Ω), point 6 knobs, respectively correspond ×
0.001, × 0.01, × 0.1, × 1, × 10, × 100, × 1000.Current output sensor is measured with precision ammeter,
The ammeter that usually can choose 4 half has selected the electricity with communication functions such as RS232 or RS485 due to needing data communication
Flow table.
Before calibrating, the resistance value of conducting wire used is measured using universal bridge, is denoted as Δ R.It is arranged on software interface and leads
" access resistance " value input item of line, corresponds to resistance delta Δ R (Ω), generally 1 Ω or less caused by conducting wire.
Planning survey data are as shown in table 2, and corresponding 7 test points are the calibrating data pair given with conductivity sensor
It answers.
Caused by 2 conducting wire of table when resistance delta Δ R=0.12 Ω, calibrating measurement data table
Wherein, section setting value is 9000, and interval endpoint is greater than 9000, then adjusting resistance value is the practical access electricity
Resistance, therefore add 0.
Relative error is less than or equal to precision as defined in conductivity sensor 16, then it is assumed that 16 precision of conductivity sensor is closed
Lattice, otherwise it is assumed that 16 precision of conductivity sensor is unqualified.Such as: the precision of conductivity sensor 16 is 0.5%, relative error
Less than or equal to the precision 0.5% of conductivity sensor 16, then it is assumed that 16 precision of conductivity sensor is qualified, otherwise it is assumed that conductance
The precision 0.5% of rate sensor 16 is unqualified.
The amendment of " conductive line resistance values ", takes intervals linear modification method, derives general formula below.It is total according to 3 points
Line is determined the slope of line segment by known two o'clock coordinate, acquires corresponding practical access resistance conversion further according to (R+ Δ R) resistance value
Current value I, in this, as standard value.
In formula (1): I1--- the corresponding current value of the adjusting resistance value of serial number 1；
R1--- the adjusting resistance value of serial number 1；
I2--- the corresponding current value of the adjusting resistance value of serial number 2；
R2--- the adjusting resistance value of serial number 2；
Δ R --- the resistance value of conducting wire access (that is, resistance delta caused by conducting wire)；
Then
Such as resistance value (that is, resistance delta caused by conducting wire) Δ R=0.12 Ω that conducting wire accesses, corresponding 1.8 Ω of resistance
When, the practical resistance for accessing conductivity sensor inductance loop should be+0.12 Ω of 1.8 Ω, need to calculate corresponding electric current at this time
Value.The point of point (R+ Δ R, I+ Δ I) is thought on (1.8,20) and (2.4,16) line segment, i.e., according to linear amendment, below from sequence
Number 7 points of derivation correction formulas.
According to three point on a straight line, the slope of line segment is determined by known two o'clock coordinate, is acquired pair further according to (R+ Δ R) resistance value
The practical access resistance conversion current value I answered, in this, as standard value.
The current value of I in formula --- corresponding points (1.8 Ω+Δ R).
- 4 Δ R=0.6 (I-20)；
Then
Such as, resistance value (that is, resistance delta caused by conducting wire) Δ R=0.12 Ω of corresponding conducting wire access, then correspond to
Current value I=19.2mA.
The derivation of 6 correction formulas of serial number is determined the slope of line segment by known two o'clock coordinate according to three point on a straight line, then
Corresponding practical access resistance conversion current value I is acquired according to (R+ Δ R) resistance value, in this, as standard value.
The current value of I in formula --- corresponding points (2.4 Ω+Δ R)
- 4 Δ R=1.2 (I-16)；
Then
Such as, resistance value (that is, resistance delta caused by conducting wire) Δ R=0.12 Ω of corresponding conducting wire access, then correspond to
Practical access resistance convert current value I=15.6mA.
Successively, serial number 5, serial number 4, the correction formula of serial number 3 can be similarly obtained to be respectively as follows:
The practical access of resistance value (that is, resistance delta caused by conducting wire) the Δ R=0.12 Ω of corresponding conducting wire access
Resistance conversion current value I=11.87mA.
The practical access of resistance value (that is, resistance delta caused by conducting wire) the Δ R=0.12 Ω of corresponding conducting wire access
Resistance conversion current value I=7.996mA.
The practical access of resistance value (that is, resistance delta caused by conducting wire) the Δ R=0.12 Ω of corresponding conducting wire access
Resistance conversion current value I=5.992mA.
Table 3 gives the current value reduction formula of corresponding calibrating serial number point resistance box resistance value.
The corresponding reduction formula of 3 resistance box resistance value of table
The correction formula for designing corresponding conductivity sensor, is in software modified data.The processing of data by
Upper computer software is completed.This method substantially increases the precision of calibrating conductivity sensor, reduces error source.
If the modification method for taking conic section to approach will access more accurate verification result, so that conducting wire introduces
Error be reduced to it is most lower.It is in the feelings for considering conductivity sensor precision present invention employs 3 points of linear modified methods
The feasible method carried out under condition is fully able to meet requirement of engineering.
In addition, the present invention provides a kind of conductivity sensor calibrating conductor resistance compensation system, comprising: a kind of conductance as above
Rate sensor examines and determine conductor resistance compensation method；Or as above a kind of conductivity sensor examines and determine conductor resistance compensation device.
Embodiment described above is only to express embodiments of the present invention, and the description thereof is more specific and detailed, but can not
Therefore limitations on the scope of the patent of the present invention are interpreted as.It should be pointed out that those skilled in the art,
Under the premise of not departing from present inventive concept, several deformations, same replacement can also be made, improved etc., these belong to the present invention
Protection scope.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of conductivity sensor examines and determine conductor resistance compensation method characterized by comprising
Determine or input the resistance delta caused by conducting wire that is connected with alternating current-direct current resistance box and conductivity sensor；
Detect the corresponding current value of adjusting resistance value of the alternating current-direct current resistance box of the conductivity sensor output；
The resistance delta, the adjusting resistance value and the current value are sent to computing unit；The computing unit is by institute
It states resistance delta to be added with the adjusting resistance value, to obtain practical access resistance, and utilizes the practical access ohmer
Calculate practical access resistance conversion current value.
2. a kind of conductivity sensor examines and determine conductor resistance compensation method according to claim 1, it is characterised in that:
Before sending the resistance delta, the adjusting resistance value and the current value to computing unit, the friendship is determined
The gear resistance value of the adjusting resistance of DC resistance box, according to the corresponding electric current of the gear resistance value of the adjusting resistance value
The relationship of value, to several interval divisions of carry out of adjusting resistance value；
The resistance delta, the gear resistance value and the current value are sent to the computing unit.
3. a kind of conductivity sensor examines and determine conductor resistance compensation method according to claim 2, the computing unit is by institute
It states resistance delta to be added with the adjusting resistance value, the method to obtain practical access resistance, it is characterised in that:
The interval endpoint in several sections is judged, if the interval endpoint is greater than section setting value, the adjusting resistance value
For the practical access resistance, the practical access resistance is sent to the computing unit.
4. a kind of any one of -3 conductivity sensor calibrating conductor resistance compensation method, feature exist according to claim 1
In, further includes:
Obtain precision as defined in the conductivity sensor；
Calculate the relative error of practical access resistance the conversion current value and the current value；
If the relative error is less than or equal to the defined precision, judge that the conductivity sensor is qualified；Otherwise,
Judge that the conductivity sensor is unqualified.
5. a kind of conductivity sensor examines and determine conductor resistance compensation device characterized by comprising
Determination unit, for determining or inputting the resistance caused by conducting wire that is connected with alternating current-direct current resistance box and conductivity sensor
Increment；
Detection unit, the corresponding electric current of adjusting resistance value of the alternating current-direct current resistance box for detecting the conductivity sensor output
Value；
Transmission unit, the transmission unit are connect with the determination unit and the detection unit respectively, for sending the electricity
Increment, the adjusting resistance value and the current value are hindered to computing unit；
The computing unit, for the resistance delta to be added with the adjusting resistance value, to obtain practical access resistance, with
And utilize the practical practical access resistance conversion current value of access resistance calculations.
6. a kind of conductivity sensor examines and determine conductor resistance compensation device according to claim 5, which is characterized in that also wrap
It includes:
Gear resistance value determination unit is sending the resistance delta, the adjusting resistance value and the current value to calculating
Before unit, the gear resistance value of the adjusting resistance of the alternating current-direct current resistance box is determined；
Interval division unit, the relationship of the current value corresponding for the gear resistance value according to the adjusting resistance value are right
Several interval divisions of carry out of adjusting resistance value；
The transmission unit sends the resistance delta, the gear resistance value and the current value to the computing unit.
7. a kind of conductivity sensor calibrating conductor resistance compensation device according to claim 6, the interval division unit,
It is characterised by comprising:
Judging unit, for judging the interval endpoint in several sections, if the interval endpoint is greater than section setting value, institute
Stating adjusting resistance value is the practical access resistance.
8. according to a kind of any one of claim 5-7 conductivity sensor calibrating conductor resistance compensation device, feature exists
In, further includes:
Acquiring unit and relative error computing unit；
The acquiring unit, for obtaining precision as defined in the conductivity sensor；
It is described that error calculation unit is connect with the acquiring unit, for calculate the practical access resistance conversion current value with
The relative error of the current value；
Described further includes precision judging unit to error calculation unit, if the relative error is less than or equal to the regulation
Precision, then the precision judging unit judges that the conductivity sensor is qualified；Otherwise, the precision judging unit judges institute
It is unqualified to state conductivity sensor.
9. according to a kind of any one of claim 5-7 conductivity sensor calibrating conductor resistance compensation device, feature exists
In, further includes:
Slave computer and host computer；
The slave computer, comprising: the determination unit, the detection unit and the transmission unit；
The host computer, comprising: the computing unit；
The slave computer, for determining that the resistance caused by conducting wire that is connected with alternating current-direct current resistance box and conductivity sensor increases
It measures, detect described in the corresponding current value of adjusting resistance value and the transmission of the alternating current-direct current resistance box of the conductivity sensor output
Resistance delta, the adjusting resistance value and the current value are to the host computer；
The resistance delta is added by the host computer with the adjusting resistance value, to obtain practical access resistance, and is utilized
The practical access resistance conversion current value of practical access resistance calculations.
10. a kind of conductivity sensor examines and determine conductor resistance compensation system characterized by comprising
A kind of conductivity sensor calibrating conductor resistance compensation method as described in claim any one of 1-4；Or
A kind of any one of claim 5-8 conductivity sensor calibrating conductor resistance compensation device.
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2215112Y (en) * | 1995-02-24 | 1995-12-13 | 唐山钢铁股份有限公司 | Automatic compensation system of resistance sensor lead wire |
| JP4478879B2 (en) * | 2004-11-01 | 2010-06-09 | 株式会社村田製作所 | Measuring error correction method and electronic component characteristic measuring apparatus |
| CN103278264A (en) * | 2013-05-16 | 2013-09-04 | 中国电子科技集团公司第四十一研究所 | Calibration method and calibration system for surface source blackbody temperature accuracy |
| CN103412009A (en) * | 2013-08-21 | 2013-11-27 | 中国海洋石油总公司 | Fluid conductivity sensor, and device and method for measuring fluid conductivity |
| CN103941206A (en) * | 2013-01-21 | 2014-07-23 | 上海共联通信信息发展有限公司 | Instrument testing device capable of eliminating connecting line resistance errors |
| CN104655327A (en) * | 2015-02-15 | 2015-05-27 | 中国测试技术研究院声学研究所 | Resistance type temperature sensor verification system and method |
| CN105093160A (en) * | 2015-07-28 | 2015-11-25 | 宁波三星电气股份有限公司 | Segmented compensation method for errors of electric energy meter |
| CN102269805B (en) * | 2010-06-07 | 2016-03-30 | 恩德莱斯和豪瑟尔测量及调节技术分析仪表两合公司 | For determining the method for the residual coupling of inductive type conductivity sensor |
| CN105891757A (en) * | 2016-03-31 | 2016-08-24 | 中国电力科学研究院 | Open-loop Hall sensor measurement accuracy verification device and verification method thereof |
| CN106199483A (en) * | 2016-06-13 | 2016-12-07 | 电子科技大学 | A kind of nonlinear error compensation method of digital multimeter |
| CN106989847A (en) * | 2017-03-22 | 2017-07-28 | 中国计量大学 | Error correcting method in system of Pt-resistance |
| CN108445298A (en) * | 2018-03-28 | 2018-08-24 | 南京林业大学 | A kind of field coupling type induction conductivity sensor and its characteristic compensation device |
-
2019
- 2019-02-18 CN CN201910119011.4A patent/CN109870487B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2215112Y (en) * | 1995-02-24 | 1995-12-13 | 唐山钢铁股份有限公司 | Automatic compensation system of resistance sensor lead wire |
| JP4478879B2 (en) * | 2004-11-01 | 2010-06-09 | 株式会社村田製作所 | Measuring error correction method and electronic component characteristic measuring apparatus |
| CN102269805B (en) * | 2010-06-07 | 2016-03-30 | 恩德莱斯和豪瑟尔测量及调节技术分析仪表两合公司 | For determining the method for the residual coupling of inductive type conductivity sensor |
| CN103941206A (en) * | 2013-01-21 | 2014-07-23 | 上海共联通信信息发展有限公司 | Instrument testing device capable of eliminating connecting line resistance errors |
| CN103278264A (en) * | 2013-05-16 | 2013-09-04 | 中国电子科技集团公司第四十一研究所 | Calibration method and calibration system for surface source blackbody temperature accuracy |
| CN103412009A (en) * | 2013-08-21 | 2013-11-27 | 中国海洋石油总公司 | Fluid conductivity sensor, and device and method for measuring fluid conductivity |
| CN104655327A (en) * | 2015-02-15 | 2015-05-27 | 中国测试技术研究院声学研究所 | Resistance type temperature sensor verification system and method |
| CN105093160A (en) * | 2015-07-28 | 2015-11-25 | 宁波三星电气股份有限公司 | Segmented compensation method for errors of electric energy meter |
| CN105891757A (en) * | 2016-03-31 | 2016-08-24 | 中国电力科学研究院 | Open-loop Hall sensor measurement accuracy verification device and verification method thereof |
| CN106199483A (en) * | 2016-06-13 | 2016-12-07 | 电子科技大学 | A kind of nonlinear error compensation method of digital multimeter |
| CN106989847A (en) * | 2017-03-22 | 2017-07-28 | 中国计量大学 | Error correcting method in system of Pt-resistance |
| CN108445298A (en) * | 2018-03-28 | 2018-08-24 | 南京林业大学 | A kind of field coupling type induction conductivity sensor and its characteristic compensation device |
Non-Patent Citations (1)
| Title |
|---|
| 张俊: "《匠人手记-一个单片机工作者的实践与思考》", 31 January 2014, 北京航空航天大学出版社 * |
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