CN105372502B - A kind of thermoelectric material resistivity measurement system and measuring method based on LabVIEW - Google Patents
A kind of thermoelectric material resistivity measurement system and measuring method based on LabVIEW Download PDFInfo
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- CN105372502B CN105372502B CN201510831393.5A CN201510831393A CN105372502B CN 105372502 B CN105372502 B CN 105372502B CN 201510831393 A CN201510831393 A CN 201510831393A CN 105372502 B CN105372502 B CN 105372502B
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Abstract
The invention discloses a kind of thermoelectric material resistivity measurement system and measuring method based on LabVIEW, system includes parameter setting module, communication module, data processing module and display module.Wherein, parameter setting module is used for user's input parameter, instruction and adjustment factor；Communication module is used to carry out serial communication with slave computer, sends instruction or receives data；Data processing module is used to carry out electric current translation operation to data, and calculates specific resistivity；Display module is used for display of the display of result of calculation with receiving data.The present invention has built the user interface of close friend using LabVIEW as software platform, easy to operate, and the construction cycle is greatly reduced and has saved development cost, and can in real time gather, handle and display；Thermoelectric material resistivity can be efficiently solved and vary with temperature caused nonlinearity erron, the resistivity of material can be accurately measured, Peltier and influence of the Seebeck effect to thermoelectric material resistivity measurement are reduced, so as to improve the measurement accuracy of resistivity.
Description
Technical field
The present invention relates to e measurement technology, virtual instrument technique, pyroelectric material performance testing field, more particularly to one kind is based on
LabVIEW thermoelectric material resistivity measurement system and measuring method.
Background technology
Energy crisis and the two large problems that environmental pollution is that social development at this stage faces.The research of green regenerative energy sources
Become most important.The heat to electricity conversion of semi-conductor thermoelectric material has expressed thickness as one of green regenerative energy sources by people
Hope.Semi-conductor thermoelectric material is a kind of new function for realizing that heat energy and electric energy mutually change using solid interior carrier moving
Material.How to improve thermoelectric material conversion efficiency is the key point studied at this stage.Thermoelectric material conversion efficiency is to pass through heat
Seebeck coefficient, thermal conductivity and the resistivity of electric material combine to obtain, thus Seebeck coefficient, thermal conductivity and resistivity it is accurate
Measure particularly significant.On the one hand it is because resistance the problem of generally existing precision deficiency for the measurement of thermoelectric material resistivity
Rate variation with temperature produces nonlinearity erron, and changes very big；On the other hand it is because thermoelectric material internal resistance is present, when electric current stream
It is out-of-date to produce extra Joule heat, and be superimposed with heating source or Peltier heat, produce shadow so as to measure pyroelectric material performance
Ring, the especially measurement of resistivity.Meanwhile system possesses good user interface, and manual measurement and automatic measurement can be realized
Switching.
The content of the invention
In order to solve thermoelectric material resistivity measurement precision deficiency, the problem of by joule heat affecting, the present invention provides a kind of
Thermoelectric material resistivity measurement system and measuring method based on LabVIEW, can realize high-precision measurement, the electricity of controllable frequency
Commutation function is flowed, and possesses automatic measurement and friendly user interface.
To achieve these goals, the present invention uses following technical scheme：
Thermoelectric material resistivity measurement system of the invention based on LabVIEW, including parameter setting module, data processing mould
Block, display module, communication module and slave computer capture card；The parameter setting module is used for user's input parameter, instruction and tune
Save coefficient；The communication module includes instruction and parameter sending module and data receiving module；The instruction sends mould with parameter
Block is used for LabVIEW and sends operational order and operating parameter to slave computer；The data receiving module is used to receive slave computer hair
The specific data sent；The data for being used to slave computer being sent to LabVIEW of the data processing module carry out electric current conversion fortune
Calculate, and calculate specific resistivity, and draw accordingly result；The display module is used for the display of result of calculation with receiving number
According to display.
As preferable, the input quantity of the parameter setting module includes manual measurement, automatic measurement, the length of thermoelectric material
Degree, width, height, surface area, commutating period and the coefficient of algorithm regulation.
As preferable, the input quantity of parameter setting module is extracted and decomposed with parameter sending module by the instruction goes out for drill
Instruct and operating parameter, and corresponding instruction is bundled with parameter, transmitted in the form of serial ports to slave computer.
As preferable, the magnitude of voltage that the data receiving module detects slave computer is transmitted to LabVIEW, for electricity
Translation operation is flowed, and calculates specific resistivity；The voltage value data include tested thermoelectric material both ends magnitude of voltage and
The output valve of reference voltage；The output valve of the reference voltage is the reality using the output valve that parameter setting module is set as target
Output valve.
As preferable, the data processing module includes manual handle module and automatically process module；
The manual handle module passes through parameter setting module sets target value based on discrete increment formula pid algorithm
With the value of adjustment factor, the specific reference voltage output valve measured from data reception module reception slave computer, with discrete increment
Formula PID formula calculate real output value and the error of target stoichiometric value, and are added with the reference voltage output value of last time,
This reference voltage output valve is obtained, while the gear selecting of manual handle needs to be manually entered numerical value；
The automatically process module needs the numeral with reference to reference voltage output valve and slave computer sampling resistor and completed, and is
After system initialization, reference voltage output valve is maximum, and the selection of slave computer sampling resistor is minimum, when receiving data reception
After the specific voltage data of block, judge for restraining, if meeting the requirements, maintain the original state；If not meeting, reference voltage is reduced
Output or increase the resistance of sampling resistor, while the regulation of reference voltage first keeps adopting prior to the regulation of sampling resistor
Sample resistance is constant, reduces reference voltage value, if reference voltage is reduced to limiting value, increases sampling resistor value, and reset benchmark
The output of magnitude of voltage..
As preferable, data that the display module includes data reception module are shown, whether measurement result is qualified
The result that display and resistivity are calculated is shown.
The present invention also provides a kind of measuring method of the thermoelectric material resistivity measurement system based on LabVIEW, this method
Comprise the steps：
A, operation button is pressed in the user interface, and system enters initialization, and enters endless loop until exit button quilt
Press；
B, the desired value in user interface input reference voltage output value, the adjustment parameter of incremental PID algorithm, electric current commutation
The commutating period of circuit and the numerical value of manual gear selecting；
C, the processing of electric current commutating period is carried out, if the time meets, carries out commutation instruction output；If not meeting, protect
The output valve of last time is held, and with Serial Port Transmission to slave computer, while the numerical value of gear selecting circuit also transmit to bottom together by binding
Machine；
D, judge manual measurement or automatic measurement, discrete increment formula pid algorithm is run if manual measurement is selected；If selection
Automatic measurement then runs the algorithm of Automatic-searching reference voltage output valve and sampling resistor；
E, no matter D steps select automatic measurement, or manual measurement, are required for being divided the output valve of reference voltage
Solution, signless octal system numerical value is decomposed into, and numerical value is transmitted to slave computer in the form of serial ports with together with instruction；
F, after reference voltage value output, slave computer is sent instructions to, carries out the collection of specific magnitude of voltage；
G, the data that data reception module is sent are received, and numerical value conversion, the calculating for resistivity are carried out to data；
H, with reference to the specific sampling resistor value being stored in LabVIEW, can be counted using the reference voltage output valve of collection
Calculation obtains the actual value of electric current in circuit, and obtains the pressure at thermoelectric material both ends using the magnitude of voltage at the thermoelectric material both ends of collection
Difference, the resistance value of thermoelectric material is finally obtained with R=U/I, with reference to the length of thermoelectric material, width, highly obtained with surface area
The resistivity of thermoelectric material；
I, the data obtained in data reception module and the specific resistivity being calculated are included in the form of numerical value
In user interface, in combination with the display of qualified lamp, it is possible to determine that whether the resistivity of systematic survey is qualified；
If J, not pressing exit button, C, D, E, F, G, H and I step are repeated；If pressing exit button, move back
Go out system.
As preferable, in step D, the specific method of manual measurement is：
The manual measurement is connect by parameter setting module sets target value and the value of adjustment factor from data reception module
The specific reference voltage output valve that slave computer measures is received, real output value and target are calculated with discrete increment formula PID formula
The error of ideal value, and error is added with the reference voltage output value of last time, this reference voltage output valve is obtained,
The gear selecting of manual handle needs to be manually entered numerical value simultaneously.
As preferable, the method for the automatic measurement is：
The automatic measurement needs the numeral with reference to reference voltage output valve and slave computer sampling resistor and completed, at the beginning of system
After beginningization, reference voltage output valve is maximum, and the selection of slave computer sampling resistor is minimum, when receiving data reception module
After specific voltage data, judge for restraining, if meeting the requirements, maintain the original state；If not meeting, the defeated of reference voltage is reduced
Go out or increase the resistance of sampling resistor, while the regulation of reference voltage first keeps sampling electricity prior to the regulation of sampling resistor
Constant, reduction reference voltage value is hindered, if reference voltage is reduced to limiting value, increase sampling resistor value, and resets reference voltage
The output of value.
The present invention compared with prior art, has the following advantages that and beneficial effect：
Thermoelectric material resistivity measurement system of the invention based on LabVIEW, using LabVIEW as software platform, builds
Friendly user interface, it is easy to operate, the construction cycle is greatly reduced and has saved development cost, and can in real time gather, handle
With display data；Large-scale resistivity measurement can be realized, scope is ohm level-mega-ohms, can solve thermoelectric material
Resistivity varies with temperature nonlinear problem, can accurately measure actual resistivity；Timing circuit commutating circuit can be determined simultaneously
When change electric current flow through direction, reduce Peltier and influence of the Seebeck effect to thermoelectric material resistivity measurement, improve electricity
The precision of resistance rate.Meanwhile the thermoelectric material resistivity measurement system based on LabVIEW can also utilize the measurement in conventional, electric-resistance
On.
Brief description of the drawings
The measuring system that Fig. 1 is the present invention forms structured flowchart.
Fig. 2 is the measuring method and program journey figure of the present invention.
Fig. 3 (a), Fig. 3 (b) are respectively the manual measurement of the present invention and the program flow diagram of automatic measurement.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are unlimited
In this.
Embodiment
As shown in figure 1, a kind of thermoelectric material resistivity measurement system based on LabVIEW includes parameter setting module, led to
Interrogate module, data processing module and display module；The parameter setting module is used for user's input parameter, instruction and regulation system
Number；The communication module includes instruction and parameter sending module and data receiving module；The instruction is used with parameter sending module
In LabVIEW operational order and operating parameter are sent to slave computer；The data receiving module is used to receive slave computer transmission
Specific data；The effect of the data processing module is that the data that slave computer is sent to LabVIEW carry out algorithm process, and is obtained
Go out accordingly result；The display module is used for display of the display of result of calculation with receiving data；
The parameter setting module input quantity include manual measurement, automatic measurement, the length of thermoelectric material, width, height,
The coefficient of surface area, commutating period and algorithm regulation.
It is described instruction with parameter sending module the input quantity of parameter setting module can extract and decomposite operational order and
Operating parameter, and corresponding instruction is bundled with parameter, transmitted in the form of serial ports to slave computer.
The magnitude of voltage that the data receiving module detects slave computer is transmitted to LabVIEW, for electric current translation operation,
And calculate specific resistivity；The voltage value data include tested thermoelectric material both ends magnitude of voltage and reference voltage it is defeated
Go out value；The output valve of the reference voltage is the real output value using the output valve that parameter setting module is set as target.
The data processing module includes manual handle module and automatically process module；The manual handle module is with discrete
Based on increment type PID algorithm, by parameter setting module sets target value and the value of adjustment factor, connect from data reception module
The specific reference voltage output valve that slave computer measures is received, real output value and target are calculated with discrete increment formula PID formula
The error of ideal value, and be added with the reference voltage output value of last time, obtain this reference voltage output valve, while hand
The gear selecting of dynamic algorithm needs to be manually entered numerical value；The automatically process module needs to adopt with slave computer with reference to reference voltage output valve
Sample resistance numeral and completes, after system initialization, reference voltage output valve for maximum, and slave computer sampling resistor selection be most
It is small, after the specific voltage data of data reception module is received, judge for algorithm, if meeting the requirements, maintain the original state；If
Do not meet, then reduce the output of reference voltage or increase the resistance of sampling resistor, while the regulation of reference voltage is prior to sampling
The regulation of resistance, i.e., first keep sampling resistor constant, reduce reference voltage value, if reference voltage is reduced to limiting value, increase
Sampling resistor value, and reset the output of reference voltage value.
The data of the display module including data reception module are shown, the display whether measurement result is qualified and resistivity
The result being calculated is shown.
As shown in Fig. 2 a kind of measuring method of thermoelectric material resistivity measurement system based on LabVIEW, including
Following step：
A, operation button is pressed in the user interface, and system enters initialization, and enters endless loop until exit button quilt
Press；
B, the desired value in user interface input reference voltage output value, the adjustment parameter of discrete increment formula pid algorithm, electricity
Flow the commutating period of commutating circuit and the numerical value of manual gear selecting；
C, the processing of electric current commutating period is carried out, if the time meets, carries out commutation instruction output；If not meeting, protect
The output valve of last time is held, and with Serial Port Transmission to slave computer, while the numerical value of gear selecting circuit also transmit to bottom together by binding
Machine；
D, judge manual measurement or automatic measurement, discrete increment formula pid algorithm is run if manual measurement is selected；If selection
Automatic measurement then runs the algorithm of Automatic-searching reference voltage output valve and sampling resistor；
The manual measurement and the flow chart of automatic measurement are as described in Figure 3；
E, no matter D steps select automatic measurement, or manual measurement, are required for being divided the output valve of reference voltage
Solution, signless octal system numerical value is decomposed into, and numerical value is transmitted to slave computer in the form of serial ports with together with instruction；
F, after reference voltage value output, slave computer is sent instructions to, carries out the collection of specific magnitude of voltage；
G, the data that data reception module is sent are received, and numerical value conversion, the calculating for resistivity are carried out to data；
H, with reference to the specific sampling resistor value being stored in LabVIEW, can be counted using the reference voltage output valve of collection
Calculation obtains the actual value of electric current in circuit, and obtains the pressure at thermoelectric material both ends using the magnitude of voltage at the thermoelectric material both ends of collection
Difference, the resistance value of thermoelectric material is finally obtained with R=U/I, with reference to the length of thermoelectric material, width, highly obtained with surface area
The resistivity of thermoelectric material；
I, the data obtained in data reception module and the specific resistivity being calculated are included in the form of numerical value
In user interface, in combination with the display of qualified lamp, it is possible to determine that whether the resistivity of systematic survey is qualified；
If j, not pressing exit button, c, d, e, f, g, h and i step are repeated；If pressing exit button, move back
Go out system.
Manual measurement illustrates：
Reference voltage is limited to 1V, and the output valve of fixed reference voltage is constant, manually changes the specific of sampling resistor
Resistance, the resistivity data of measurement is read in the case where qualified lamp is green light；The method of manual measurement and automatic measurement such as Fig. 3
(a) and shown in Fig. 3 (b).
Table 1 is the specific data of manual measurement
Table 1
Automatic measurement illustrates：
The output of reference voltage and the resistance of sampling resistor are Automatic-searchings, much plant combination；Similar, wait conjunction
Lattice lamp switchs to the measured value that resistivity could be read after green, and qualified lamp switchs to the number that the data after green are only accurate measurement
According to；
Table 2 is the specific data of automatic measurement
Table 2
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (8)
1. a kind of thermoelectric material resistivity measurement system based on LabVIEW, it is characterised in that including parameter setting module, number
According to processing module, display module, communication module and slave computer capture card；The parameter setting module be used for user's input parameter,
Instruction and adjustment factor；The communication module includes instruction and parameter sending module and data reception module；The instruction and ginseng
Number sending module is used for LabVIEW and sends operational order and operating parameter to slave computer；The data reception module is used to receive
The specific data that slave computer is sent；The data for being used to slave computer being sent to LabVIEW of the data processing module carry out electricity
Translation operation is flowed, and calculates specific resistivity, and draws accordingly result；The display module is used for the display of result of calculation
Display with receiving data；
The data processing module includes manual handle module and automatically process module；
The manual handle module is based on discrete increment formula pid algorithm, by parameter setting module sets target value with adjusting
The value of coefficient is saved, the specific reference voltage output valve measured from data reception module reception slave computer, with discrete increment formula PID
Formula calculates real output value and the error of target stoichiometric value, and is added with the reference voltage output value of last time, obtains
This reference voltage output valve, while the gear selecting of manual handle needs to be manually entered numerical value；
The automatically process module needs to combine the numerical value of reference voltage output valve and slave computer sampling resistor to complete, at the beginning of system
After beginningization, reference voltage output valve is maximum, and the selection of slave computer sampling resistor is minimum, when receiving data reception module
After specific voltage data, judge for restraining, if meeting the requirements, maintain the original state；If not meeting, the defeated of reference voltage is reduced
Go out or increase the resistance of sampling resistor, while the regulation of reference voltage first keeps sampling electricity prior to the regulation of sampling resistor
Constant, reduction reference voltage value is hindered, if reference voltage is reduced to limiting value, increase sampling resistor value, and resets reference voltage
The output of value.
2. the thermoelectric material resistivity measurement system according to claim 1 based on LabVIEW, it is characterised in that described
The input quantity of parameter setting module includes manual measurement, automatic measurement, the length of thermoelectric material, width, height, surface area, changed
To time and the coefficient of algorithm regulation.
3. the thermoelectric material resistivity measurement system according to claim 1 based on LabVIEW, it is characterised in that described
The input quantity of parameter setting module is extracted and decomposites operational order and operating parameter with parameter sending module by instruction, and by phase
Corresponding instruction bundles with parameter, is transmitted in the form of serial ports to slave computer.
4. the thermoelectric material resistivity measurement system according to claim 1 based on LabVIEW, it is characterised in that described
The magnitude of voltage that data reception module detects slave computer is transmitted to LabVIEW, for electric current translation operation, and is calculated specific
Resistivity；The voltage value data includes the magnitude of voltage at tested thermoelectric material both ends and the output valve of reference voltage；The base
The output valve of quasi- voltage is the real output value using the output valve that parameter setting module is set as target.
5. the thermoelectric material resistivity measurement system according to claim 1 based on LabVIEW, it is characterised in that described
The data of display module including data reception module are shown, the display whether measurement result is qualified and the knot that resistivity is calculated
Fruit shows.
6. a kind of measuring method of the thermoelectric material resistivity measurement system based on LabVIEW, it is characterised in that including following steps
Suddenly：
A, operation button is pressed in the user interface, and system enters initialization, and enters endless loop until exit button is pressed；
B, the desired value in user interface input reference voltage output value, the adjustment parameter of discrete increment formula pid algorithm, electric current change
The numerical value of commutating period and manual gear selecting to circuit；
C, the processing of electric current commutating period is carried out, if the time meets, carries out commutation instruction output；If not meeting, in holding
Output valve once, and with Serial Port Transmission to slave computer, while the numerical value of gear selecting circuit also transmit to slave computer together by binding；
D, judge manual measurement or automatic measurement, discrete increment formula pid algorithm is run if manual measurement is selected；If selection is automatic
Measurement then runs the step of Automatic-searching reference voltage output valve and sampling resistor；
E, no matter D steps select automatic measurement, or manual measurement, are required for being decomposed the output valve of reference voltage, point
Solve as signless octal system numerical value, and numerical value is transmitted to slave computer in the form of serial ports with together with instruction；
F, after reference voltage value output, slave computer is sent instructions to, carries out the collection of specific magnitude of voltage；
G, the data that data reception module is sent are received, and numerical value conversion, the calculating for resistivity are carried out to data；
H, with reference to the specific sampling resistor value being stored in LabVIEW, can be calculated using the reference voltage output valve of collection
The actual value of electric current into circuit, and the pressure difference at thermoelectric material both ends is obtained using the magnitude of voltage at the thermoelectric material both ends of collection,
The resistance value of thermoelectric material is finally obtained with R=U/I, with reference to the length of thermoelectric material, width, highly obtains thermoelectricity with surface area
The resistivity of material；
I, the data obtained in data reception module and the specific resistivity being calculated are included in user in the form of numerical value
In interface, in combination with the display of qualified lamp, it is possible to determine that whether the resistivity of systematic survey is qualified；
If J, not pressing exit button, C, D, E, F, G, H and I step are repeated；If pressing exit button, exit and be
System.
7. the measuring method of the thermoelectric material resistivity measurement system according to claim 6 based on LabVIEW, its feature
It is, in step D, the specific method of manual measurement is：
The manual measurement is by parameter setting module sets target value and the value of adjustment factor, under data reception module reception
The specific reference voltage output valve that position machine measures, it is preferable with target that real output value is calculated with discrete increment formula PID formula
The error of value, and be added with the reference voltage output value of last time, obtain this reference voltage output valve, while place manually
The gear selecting of reason needs to be manually entered numerical value.
8. the measuring method of the thermoelectric material resistivity measurement system according to claim 6 based on LabVIEW, its feature
It is, in step D, the method for the automatic measurement is：
The automatic measurement needs the numeral with reference to reference voltage output valve and slave computer sampling resistor and completed, system initialization
Afterwards, reference voltage output valve is maximum, and the selection of slave computer sampling resistor is minimum, when receiving the specific of data reception module
After voltage data, judge for algorithm, if meeting the requirements, maintain the original state；If not meeting, reduce reference voltage output or
Increase the resistance of sampling resistor, while the regulation of reference voltage first keeps sampling resistor not prior to the regulation of sampling resistor
Become, reduce reference voltage value, if reference voltage is reduced to limiting value, increase sampling resistor value, and reset reference voltage value
Output.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253287A (en) * | 2011-05-27 | 2011-11-23 | 青岛大学 | LABview-based method for measuring temperature-resistivity |
| CN102539927A (en) * | 2011-12-14 | 2012-07-04 | 东华大学 | Method for measuring temperature-controllable four-probe square resistance and resistivity |
| CN202362386U (en) * | 2011-11-07 | 2012-08-01 | 甘肃机电职业技术学院 | High power carbon electrode resistivity measuring device |
| CN104422711A (en) * | 2013-08-30 | 2015-03-18 | 国家纳米科学中心 | Variable temperature sample platform and thermoelectric property measuring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003232822A (en) * | 2002-02-07 | 2003-08-22 | Deicy Corp | Resistivity measuring method by four probe method and its device |
| US8688390B2 (en) * | 2009-05-18 | 2014-04-01 | Jon Murray Schroeder | Thermoelectric evaluation and manufacturing methods |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253287A (en) * | 2011-05-27 | 2011-11-23 | 青岛大学 | LABview-based method for measuring temperature-resistivity |
| CN202362386U (en) * | 2011-11-07 | 2012-08-01 | 甘肃机电职业技术学院 | High power carbon electrode resistivity measuring device |
| CN102539927A (en) * | 2011-12-14 | 2012-07-04 | 东华大学 | Method for measuring temperature-controllable four-probe square resistance and resistivity |
| CN104422711A (en) * | 2013-08-30 | 2015-03-18 | 国家纳米科学中心 | Variable temperature sample platform and thermoelectric property measuring method |
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