CN107462342A - Method for acquiring temperature, electronic equipment and the computer-readable recording medium of thermocouple - Google Patents
Method for acquiring temperature, electronic equipment and the computer-readable recording medium of thermocouple Download PDFInfo
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- CN107462342A CN107462342A CN201710640975.4A CN201710640975A CN107462342A CN 107462342 A CN107462342 A CN 107462342A CN 201710640975 A CN201710640975 A CN 201710640975A CN 107462342 A CN107462342 A CN 107462342A
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- thermocouple
- temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
- G01K7/10—Arrangements for compensating for auxiliary variables, e.g. length of lead
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Abstract
The present embodiments relate to field of temperature measurement, discloses a kind of method for acquiring temperature of thermocouple, electronic equipment and computer-readable recording medium.The method for acquiring temperature of thermocouple in the present invention, including：Previously according to the phasing meter of thermocouple, the voltage of thermocouple and the matched curve of temperature are obtained；When receiving the first voltage from thermocouple, the temperature of corresponding first voltage is obtained according to matched curve.Method for acquiring temperature, electronic equipment and the computer-readable recording medium of thermocouple in the embodiment of the present invention so that the occupancy to controller resource, the high performance use of lifting controller can be reduced under the premise of the temperature value for ensureing to obtain is as far as possible accurate.
Description
Technical field
The present embodiments relate to field of temperature measurement, more particularly to utilizes the technology of thermocouple temperature measurement.
Background technology
Thermocouple is because its measurement temperature scope is wide, and cost is low to be had been widely used among industrial temperature measurement, indexing
Table is the form arranged by the relation between electric thermo-couple temperature and voltage.Due to temperature value corresponding to each magnitude of voltage in phasing meter
It is nonlinear, in existing implementation, typically by among phasing meter deposit system, is looked into according to the magnitude of voltage of reading
Table, obtain corresponding temperature value.Although this method is realized simply, need loading form can be to control when real system is run
Device brings very big operating pressure.Existing solution below：
A solution is the compensation method that error is provided for measurement result, but it was found by the inventors of the present invention that the party
Method is also to need to determine actual temperature value by referring to the phasing meter magnitude of voltage of thermocouple.In industrial applications, industry
Controller receives after the voltage analog signal of thermocouple compared with being stored in the phasing meter among internal memory, thus greatly
Big occupies controller resource, is unfavorable for the high performance use of controller；But handed over again after if directly voltage signal is handled well
Being handled by controller then needs to increase hardware device, can but increase the application cost of product, lose more than gain.
The conversion method between potential value and temperature is proposed in another solution, but the present inventor sends out
Existing, the temperature value that this method calculates is only between 0-300 degrees Celsius.This method after actual heating-up temperature is more than 300 degrees Celsius
Error nonlinear increase will occur, the inaccuracy that the conversion between potential and temperature will become, lose algorithm research
Meaning.
The content of the invention
The purpose of embodiment of the present invention is to provide a kind of method for acquiring temperature of thermocouple, electronic equipment and computer
Readable storage medium storing program for executing so that can reduce and accounted for controller resource under the premise of the temperature value for ensureing to obtain is as far as possible accurate
With the high performance use of lifting controller.
In order to solve the above technical problems, embodiments of the present invention provide a kind of method for acquiring temperature of thermocouple, bag
Include：Previously according to the phasing meter of thermocouple, the voltage of the thermocouple and the matched curve of temperature are obtained；Institute is come from receiving
When stating the first voltage of thermocouple, the temperature of the corresponding first voltage is obtained according to the matched curve.
Embodiments of the present invention additionally provide a kind of electronic equipment, including：At least one processor；And with it is described
The memory of at least one processor communication connection；Wherein, the memory storage, which has, to be held by least one processor
Capable instruction, the instruction is by least one computing device, so that at least one processor is able to carry out as above
The method for acquiring temperature for the thermocouple stated.
Embodiments of the present invention additionally provide a kind of computer-readable recording medium, are stored with computer program, described
The method for acquiring temperature of above-mentioned thermocouple is realized when computer program is executed by processor.
In terms of existing technologies, the main distinction and its effect are embodiment of the present invention：Previously according to thermocouple
Phasing meter obtain thermocouple voltage and temperature matched curve, only need afterwards according to the matched curve, it is possible to according to
The voltage of thermocouple output obtains temperature.Because for controller, the calculating of multi-term expression is compared with the loading of form, is accounted for
It is less with controller resource, so controller does not have shadow substantially when performing the calculating of multi-term expression, to high performance use
Ring.On the other hand, because the multi-term expression of curve forms according to the fitting of the data of phasing meter, so its temperature value still exists
In tolerance interval.It can be seen that the method for acquiring temperature of thermocouple in embodiment of the present invention, electronic equipment and computer-readable
Storage medium can reduce the occupancy to controller resource, lifting control under the premise of the temperature value for ensureing to obtain is as far as possible accurate
The high performance use of device processed.
As a further improvement, the phasing meter previously according to thermocouple, the voltage and temperature of the thermocouple are obtained
Matched curve, specifically include：Carried out curve fitting using least square method.Further limit and utilize least square method march
Line is fitted so that the curve fitted is more accurate.
As a further improvement, the matched curve is the curve of six orders, nine orders or ten orders.Further limit bent
The order of line so that curve is more higher close to the numerical value in phasing meter, the degree of accuracy.
As a further improvement, the expression formula of the matched curve is：φ (x)=a0+a1x+a2x2+…amxm；Wherein, institute
It is magnitude of voltage to state x, and the φ (x) is temperature value, and the m is 5,8 or 9.Further limit order of a curve so that curve is more
It is higher close to the numerical value in phasing meter, the degree of accuracy.
Brief description of the drawings
One or more embodiments are illustrative by the picture in corresponding accompanying drawing, these exemplary theorys
The bright restriction not formed to embodiment, the element for having same reference numbers label in accompanying drawing are expressed as similar element, removed
Non- have a special statement, and composition does not limit the figure in accompanying drawing.
Fig. 1 is the method for acquiring temperature flow chart of the thermocouple in first embodiment of the invention；
Fig. 2 is the electronic equipment schematic diagram in second embodiment of the invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with accompanying drawing to the present invention
Each embodiment be explained in detail.However, it will be understood by those skilled in the art that in each embodiment party of the present invention
In formula, in order that reader more fully understands the application and proposes many ins and outs.But even if without these ins and outs
With many variations based on following embodiment and modification, the application technical scheme claimed can also be realized.
The first embodiment of the present invention is related to a kind of method for acquiring temperature of thermocouple.Thermocouple in present embodiment
Temperature obtain flow chart as shown in figure 1, specific as follows：
Step 101, the voltage of thermocouple and the matched curve of temperature are obtained.
Specifically, this method can apply to a kind of electronic equipment.The electronic equipment can be previously according to thermocouple
Phasing meter, respectively the voltage to thermocouple in phasing meter and corresponding temperature carry out curve fitting, so as to obtain matched curve.Electricity
Sub- equipment can obtain the expression formula of the matched curve, the i.e. matched curve, be pre-stored in local.
In particular, the method for curve matching can be fitted using least square method in present embodiment.It is minimum
Square law (also known as least squares method) is a kind of mathematical optimization techniques.It finds data most by minimizing the quadratic sum of error
Nice function matches.Unknown data can be easily tried to achieve using least square method, and cause these data and reality for trying to achieve
The quadratic sum of error is minimum between data.
In the present embodiment, magnitude of voltage in phasing meter is defined as x, its corresponding temperature value is f (x), establishes curve
Fitting function φ (x), φ (x) do not require strict each data point of coincidence, and fitting function is in data point xiDeviation I=0,1 ... m.It can be drawn according to above formula, be gone to be fitted the good of y=f (x) with φ (x)
Bad problem has reformed into εiSize issue.It is the fitting for allowing the quadratic sum minimum of deviation to carry out curve using least square method,
If εiQuadratic sum it is minimum, that is, meet：
φ (x)=a among above formula (1)0+a1x+a2x2+…amxm, undetermined coefficient a is sought so may finally be transformed into0,
a1,…,am.M therein is related to order of a curve time.Wherein, when least square error minimum, to coefficient a0,a0,…amSeek local derviation
Number, it is zero to make partial derivative；By (xi,yi) bring partial derivative equation into, seek solution of equations；Obtaining coefficient a0,a1,…am, will after value
Coefficient is brought into equationReturn, pass through each regression point (x among regression process0,y0,x1,y1…xm,ym)；To be terrible
To preferable criterion formula, can be judged by coefficient R, statistic F and remaining standard deviation S, its criterion
It is 1 better more to be leveled off to for, R, and F obtains absolute value and is the bigger the better, and it is 0 better that S more levels off to.
Wherein：
In order to obtain the curve of more preferably fitting effect, order can use five orders, nine orders, ten orders or higher order time
Curve.Further say, it was found by the inventors of the present invention that when thermocouple is K-type thermocouple, m is taken as 8, and (i.e. nine orders are bent
Line) higher degree of fitting can be obtained, so present embodiment it is determined that m be 8 after, from thermocouple indexing table obtain each group electricity
Press temperature value to substitute into, equation group can be solved, finally respectively obtain undetermined coefficient a0,a1,…,am.Specifically, this embodiment party
A in formula0=0.226584602；a1=24152.109；a2=67233.4248；a3=2210340.682；a4=-
860963914.9；a5=4.83506*1010；a6=-1.18452*1012；a7=1.3869*1013；a8=-6.33708*1013。
Step 102, the first voltage from thermocouple is received.
Specifically, when thermocouple is to device thermometric, interior metal is because outside heat produces electrical potential difference (the i.e. first electricity
Pressure), and the first voltage is output to electronic equipment.
Step 103, the temperature of corresponding first voltage is obtained according to matched curve.
Specifically, both can be with according to the matched curve obtained in step 101, and the first voltage obtained in step 102
Obtain temperature value corresponding with first voltage.In particular, matched curve is stored in the form of expression formula, expresses certain thermocouple
Voltage and temperature relation.Voltage such as thermocouple is x, and corresponding temperature can be φ (x).
In present embodiment, the present inventor fully analyze using phasing meter obtain temperature value method lack
After falling into, known and usual look-up table in row has been abandoned creatively, employs matched curve and the method calculated, this side
Method is the innovation first of device field of temperature measurement.
In addition, it is noted that carried out curve fitting in present embodiment using least square method, but it is actual should
In, it can also be carried out curve fitting using other method, such as " method that discrete data is approached with analytical expression ", herein not
Repeat again.
In terms of existing technologies, the main distinction and its effect are present embodiment：Previously according to point of thermocouple
Spend table and obtain the voltage of thermocouple and the matched curve of temperature, only need afterwards according to the matched curve, it is possible to according to thermoelectricity
The voltage occasionally exported obtains temperature.Because for controller, the calculating of multi-term expression is compared with the loading of form, control is taken
Device resource processed is less, so controller when performing the calculating of multi-term expression, does not influence substantially on high performance use.Separately
On the one hand, because the multi-term expression of curve forms according to the fitting of the data of phasing meter, so its temperature value still can connect
By in the range of.It can be seen that the method for acquiring temperature of the thermocouple in present embodiment can be as far as possible accurate in the temperature value for ensureing to obtain
On the premise of really, the occupancy to controller resource, the high performance use of lifting controller are reduced.
Second embodiment of the present invention is related to a kind of method for acquiring temperature of thermocouple.Second embodiment is real with first
It is roughly the same to apply mode, is in place of the main distinction：In the first embodiment, thermocouple is K-type thermocouple.And in the present invention
In second embodiment, thermocouple is S type thermocouples.
Specifically, according to the derivation method similar with first embodiment, invention of the invention show that thermocouple is S
During type thermocouple, the matched curve of ten orders can be more accurate.
It is noted that thermocouple be except can be the K-type thermocouple in first embodiment, or the second embodiment party
S type thermocouples in formula, E type thermocouples are can also be, the order of corresponding matched curve is ten orders；It can also be J-type heat
Galvanic couple, the order of corresponding matched curve is six orders.
It is noted that the numerical value of each type thermoelectric idol and parameter is as shown in the table in present embodiment：
| Thermocouple | K-type | S types | E types | J-type |
| A0 | 0.226584602 | 0.927763167 | 0.104967248 | -0.048868252 |
| A1 | 24152.109 | 169526.515 | 17189.45282 | 19873.14503 |
| A2 | 67233.4248 | -31568363.94 | -282639.085 | -218614.5353 |
| A3 | 2210340.682 | 8990730663 | 12695339.5 | 11569199.78 |
| A4 | -860963914.9 | -1.63565*1012 | -44870384.6 | -264917531.4 |
| A5 | 4.83506*1010 | 1.88027*1014 | 1.1086*1010 | 2018441314 |
| A6 | -1.18452*1012 | -1.37241*1016 | -1.76807*1011 | |
| A7 | 1.3869*1013 | 6.17501*1017 | 1.71842*1012 | |
| A8 | -6.33708*1013 | -1.56105*1019 | -9.19278*1012 | |
| A9 | 1.69535*1020 | 2.06132*1013 |
The step of various methods divide above, be intended merely to describe it is clear, can be merged into when realizing a step or
Some steps are split, are decomposed into multiple steps, as long as including identical logical relation, all protection domain in this patent
It is interior；To either adding inessential modification in algorithm in flow or introducing inessential design, but its algorithm is not changed
Core design with flow is all in the protection domain of the patent.
Third embodiment of the invention is related to a kind of electronic equipment, as shown in Fig. 2 including：
At least one processor 202；And
With the memory 201 of at least one processor 202 communication connection；Wherein,
Memory 201 is stored with the instruction that can be performed by least one processor 202, instructs by least one processor
202 perform, so that at least one processor 202 is able to carry out the thermoelectricity as mentioned in first embodiment or second embodiment
Even method for acquiring temperature.
Wherein, memory 201 is connected with processor 202 using bus mode, and bus can include any number of interconnection
Bus and bridge, bus one or more processors 202 and the various of memory 201 are electrically connected to together.Bus may be used also
So that the various other of such as ancillary equipment 203, voltage-stablizer 204 and management circuit or the like to be electrically connected to together, this
A little is all it is known in the art, therefore, no longer it is described further herein.EBI bus and transceiver it
Between interface is provided.Transceiver can be an element or multiple element, such as multiple receivers and transmitter, there is provided
For the unit to be communicated over a transmission medium with various other devices.The data handled through processor 202 are by antenna wireless
It is transmitted on medium, further, antenna also receives data and transfers data to processor 202.
Processor 202 is responsible for bus and common processing, can also provide various functions, including timing, periphery connects
Mouthful, voltage-regulation, power management and other control functions.And memory 201 can be used for storage processor 202 and perform
Used data during operation.
Sixth embodiment of the invention is related to a kind of computer-readable recording medium, is stored with computer program.Computer
Above method embodiment is realized when program is executed by processor.
That is, it will be understood by those skilled in the art that realize that all or part of step in above-described embodiment method is can be with
The hardware of correlation is instructed to complete by program, the program storage is in the storage medium, including some instructions are making
Obtain an equipment (can be single-chip microcomputer, chip etc.) or processor (processor) performs each embodiment method of the application
All or part of step.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.
It will be understood by those skilled in the art that the respective embodiments described above are to realize the specific embodiment of the present invention,
And in actual applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (9)
- A kind of 1. method for acquiring temperature of thermocouple, it is characterised in that including：Previously according to the phasing meter of thermocouple, the voltage of the thermocouple and the matched curve of temperature are obtained；When receiving the first voltage from the thermocouple, the corresponding first voltage is obtained according to the matched curve Temperature.
- 2. the method for acquiring temperature of thermocouple according to claim 1, it is characterised in that described previously according to thermocouple Phasing meter, the voltage of the thermocouple and the matched curve of temperature are obtained, is specifically included：Carried out curve fitting using least square method.
- 3. the method for acquiring temperature of thermocouple according to claim 1, it is characterised in that the expression formula of the matched curve For：φ (x)=a0+a1x+a2x2+…amxm；Wherein, the x is magnitude of voltage, and the φ (x) is temperature value, and the m is 5,8 or 9.
- 4. the method for acquiring temperature of thermocouple according to claim 3, it is characterised in that the thermocouple is K-type thermoelectricity Even, the m is 8, a0For the 0.226584602, a1For the 24152.109, a2For the 67233.4248, a3For 2210340.682, a4For -860963914.9, a5For 4.83506*1010, a6For -1.18452*1012, institute State a7For 1.3869*1013, a8For -6.33708*1013。
- 5. the method for acquiring temperature of thermocouple according to claim 3, it is characterised in that the thermocouple is S type thermoelectricity Even, the m is 9, a0For the 0.927763167, a1For the 169526.515, a2For -31568363.94, a3 For the 8990730663, a4For -1.63565*1012, a5For 1.88027*1014, a6For -1.37241*1016, institute State a7For 6.17501*1017, a8For -1.56105*1019, a9For 1.69535*1020。
- 6. the method for acquiring temperature of thermocouple according to claim 3, it is characterised in that the thermocouple is E type thermoelectricity Even, the m is 9, a0For the 0.104967248, a1For the 17189.45282, a2For -282639.085, a3 For the 12695339.5, a4For -44870384.6, a5For 1.1086*1010, a6For -1.76807*1011, it is described a7For 1.71842*1012, a8For -9.19278*1012, a9For 2.06132*1013。
- 7. the method for acquiring temperature of thermocouple according to claim 3, it is characterised in that the thermocouple is J-type thermoelectricity Even, the m is 5, a0For -0.048868252, a1For the 19873.14503, a2For -218614.5353, it is described a3For the 11569199.78, a4For -264917531.4, a5For 2018441314.
- 8. a kind of electronic equipment, it is characterised in that including：At least one processor；AndThe memory being connected with least one processor communication；Wherein,The memory storage has can be by the instruction of at least one computing device, and the instruction is by least one place Manage device to perform, so that at least one processor is able to carry out the temperature of the thermocouple as described in any in claim 1 to 7 Acquisition methods.
- 9. a kind of computer-readable recording medium, is stored with computer program, it is characterised in that the computer program is processed Device realizes the method for acquiring temperature of the thermocouple any one of claim 1 to 7 when performing.
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