CN108613751A - A kind of high-precision and high-stability temperature polling instrument and preparation method thereof, method for inspecting - Google Patents
A kind of high-precision and high-stability temperature polling instrument and preparation method thereof, method for inspecting Download PDFInfo
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- CN108613751A CN108613751A CN201810707700.2A CN201810707700A CN108613751A CN 108613751 A CN108613751 A CN 108613751A CN 201810707700 A CN201810707700 A CN 201810707700A CN 108613751 A CN108613751 A CN 108613751A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title claims description 6
- 238000005259 measurement Methods 0.000 claims abstract description 27
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 111
- 229910052697 platinum Inorganic materials 0.000 claims description 56
- 230000001681 protective effect Effects 0.000 claims description 29
- 239000000843 powder Substances 0.000 claims description 19
- 239000010453 quartz Substances 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 13
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical group [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 7
- 238000007711 solidification Methods 0.000 claims description 7
- 230000008023 solidification Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 4
- 239000000395 magnesium oxide Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 239000011812 mixed powder Substances 0.000 claims description 2
- 230000008030 elimination Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 9
- 230000007613 environmental effect Effects 0.000 description 5
- 238000007689 inspection Methods 0.000 description 5
- 229910052738 indium Inorganic materials 0.000 description 4
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- 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
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
- G01K7/20—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/005—Calibration
Abstract
The invention discloses a kind of high-precision and high-stability temperature polling instruments, including multiple temperature collecting modules, microcontroller, clock-reset circuit, communicating circuit and power circuit, the temperature collecting module is electrically connected with the multiple input end of the microcontroller respectively, the clock-reset circuit and the monolithic mechatronics, the communicating circuit and the monolithic mechatronics, the power circuit are electrically connected with temperature collecting module, microcontroller and clock with reset circuit respectively.The invention also discloses a kind of method for inspecting of high-precision and high-stability temperature polling instrument.Logging and method for inspecting using the present invention have the advantages that high certainty of measurement, uncertainty are low.
Description
Technical field
The present invention relates to thermometric instrument technical field more particularly to a kind of high-precision and high-stability temperature polling instrument and its systems
Preparation Method, method for inspecting.
Background technology
With the development of science and technology, in the high-precision environment temperature monitoring of the industries such as temperature measurement, instrument and meter, environmental monitoring
For instrument using more and more, some Instrument measuring precisions even can reach ± 0.1 DEG C, be used for what environment monitor was calibrated therewith
The precision of the environmental test equipments such as high-precision temperature test chamber is higher and higher, some temperature fluctuations are less than ± 0.03 DEG C/30min,
Temperature uniformity is less than 0.05 DEG C.
Metering industry is mainly temperature polling instrument for the instrument of Climate Chamber detection calibration at present, and temperature is patrolled
Inspection instrument is made of multiplexer channel Acquisition Instrument and industrial platinum resistance, multiplexer channel Acquisition Instrument generally by relay switching channel, after
Hot parasitic potential can be brought in electric appliance handoff procedure, influence measurement error, and measuring signal stabilization also needs after relay switching
Certain time is wanted, if number of channels is more, measurement error can be introduced in uniformity test.
Industrial platinum resistance generally selects Pt100 thermal resistances, even if the measurement accuracy of the highest AA grades of Pt100 thermal resistance of precision
Also at 0.1 DEG C or more, in addition the error of measuring instrumentss, logging device uncertainty of measurement, can only generally at 0.2 DEG C (k=2)
For the calibration of common ambient testing equipment, precision and instability index cannot be satisfied high-precision environmental temperature experiment and set
The requirement of standby calibration.
Invention content
Technical problem to be solved by the present invention lies in provide a kind of high-precision and high-stability temperature polling instrument, can avoid
Parasitic EMF during Measuring and the inconsistent homogeneity error brought of each interchannel reading duration, improve the measurement accuracy of platinum resistance, to
The measurement accuracy for improving temperature polling instrument, reduces the uncertainty of measurement of temperature polling instrument.
To solve the above-mentioned problems, the present invention provides a kind of high-precision and high-stability temperature polling instruments, including multiple temperature
Spend acquisition module, microcontroller, clock-reset circuit, communicating circuit and power circuit, the temperature collecting module respectively with it is described
The multiple input end of microcontroller is electrically connected, the clock-reset circuit and the monolithic mechatronics, the communicating circuit and institute
Monolithic mechatronics are stated, the power circuit is electrically connected with temperature collecting module, microcontroller and clock with reset circuit respectively,
The temperature collecting module includes thermal resistance, bridge resistor measuring circuit and A/D conversion circuits, the bridge resistor measuring circuit
It is electrically connected with the thermal resistance, the input terminal of the A/D conversion circuits is electrically connected with the bridge resistor measuring circuit, the A/
The output end of D conversion circuits is electrically connected with the input terminal of the microcontroller.
Further, the high-precision and high-stability temperature polling instrument further includes reference voltage circuit, the reference voltage
Circuit is electrically connected with the bridge resistor measuring circuit and the A/D conversion circuits respectively.
Further, the thermal resistance is PT25 platinum resistance.
Further, the thermal resistance includes outside protective pipe, quartzy skeleton, temperature-sensing element, platinum lead and lug plate, described
Outside protective pipe seals and is filled with oxygenous helium, and the quartz skeleton is set in the outside protective pipe, the quartz skeleton
Fill insulating powder in gap between the outside protective pipe, the quartz skeleton sets that there are two through-hole, the temperature-sensitives in an axial direction
Element bends to U-shaped and is set in the through-hole, and the temperature-sensing element both ends are separately connected two platinum leads, and the platinum draws
The line other end connects the lug plate.
Further, the insulating powder is the mixed-powder of magnesia and quartz.
Further, the outer diameter of the outside protective pipe is 5-8mm, and the length of the temperature-sensing element is 50-70mm, the platinum
The length of lead is 1500-2500mm.
Further, the temperature-sensing element is made of temperature-sensitive platinum filament, a diameter of 0.06-0.08mm of the temperature-sensitive platinum filament,
The temperature-sensitive platinum filament coiling is spiral.
Further, the lug plate is red copper lug plate.
Second aspect of the present invention provides a kind of preparation method of thermal resistance in high-precision and high-stability temperature polling instrument, packet
Include following steps：
1) it is respectively washed, outside protective pipe described in high-temperature roasting, quartzy skeleton, temperature-sensitive platinum filament, insulating powder, platinum lead and connects
Line piece；
2) the temperature-sensitive platinum filament described in coiling in dustless incubator is annealed hundreds of hours around the temperature-sensitive platinum filament made at 680 DEG C；
3) outside protective pipe, quartzy skeleton, temperature-sensitive platinum filament, insulating powder, platinum lead are assembled in dustless incubator and are connect
Line piece；
4) it after assembling the thermal resistance, anneals hundreds of hours in tin solidification point again.
Third aspect present invention provides a kind of method for inspecting of high-precision and high-stability temperature polling instrument, including following step
Suddenly：
1) logging is demarcated using portable fixing point device, and multiple temperature collecting modules is carried out
It corrects, eliminates measurement error between multiple temperature collecting modules；
2) multiple thermal resistances are separately fixed at according to cloth point diagram on the corresponding position of equipment to be inspected；
3) the calibration temperature spot of equipment to be inspected is set, and equipment thermal field to be inspected starts collecting temperature data after stablizing；
4) temperature data acquired is uploaded to host, Framework computing temperature fluctuation, uniformity by the communicating circuit
And uncertainty；
5) logging is demarcated again by portable fixing point device, verifies the monolithic stability of the logging
Property.
Using logging of the present invention, have the advantages that：
The measurement accuracy of thermal resistance of the present invention reaches 5mK, and industrial platinum resistance thermometer measure precision is generally at 0.1 DEG C,
Substantially increase the measurement accuracy of thermal resistance；
Multiple parallel temperature collecting modules are used, the use of relay are avoided, so as to avoid Parasitic EMF during Measuring
Generation, reduce measurement error；
Each temperature collecting module independent acquisition temperature data avoids each channel that multiple channel switchings are brought and reads not
Unanimously, the homogeneity error of measurement is reduced；
Every time measure before and after all logging is demarcated and is verified using fixed point device, then to each channel of logging into
Row is corrected, and eliminates interchannel measurement error in this way, and can guarantee that logging measurement data is accurate, reliable；
The temperature field measurement for realizing chamber automatically by temperature field measurement software can ensure that data acquisition, record are more real-time, accurate
Really, it avoids artificial sensing tape and carrys out error；Software calculates the numerical value such as error, uniformity and fluctuation degree by algorithm automatically, avoids
Artificial calculating brings the error, result of calculation more acurrate, reliable；
In conjunction with above-mentioned logging and method for inspecting, the measurement accuracy of logging has reached 0.001%, and uncertainty reaches
0.01 DEG C (k=2) substantially increases the precision and stability of logging measurement.
Description of the drawings
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology and advantage, below will be to implementing
Example or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, the accompanying drawings in the following description is only
Only it is some embodiments of the present invention, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of circuit diagram of high-precision and high-stability temperature polling instrument of the present invention；
Fig. 2 is the structural schematic diagram of thermal resistance in a kind of high-precision and high-stability temperature polling instrument of the present invention；
Fig. 3 is a kind of cloth point diagram of the thermal resistance of the method for inspecting of high-precision and high-stability temperature polling instrument of the present invention.
Wherein, attached drawing correspondence markings are in figure：
1- outside protective pipe 2- quartz skeleton 3- temperature-sensing elements
4- insulating powder 5- platinum leads
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
Step ground detailed description.Obviously, described embodiment is only one embodiment of the invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained all under the premise of not making creative work
Other embodiment shall fall within the protection scope of the present invention.
" one embodiment " or " embodiment " referred to herein refers to that may be included at least one realization method of the present invention
A particular feature, structure, or characteristic.In the description of the present invention, it is to be understood that, term "upper", "lower", "left", "right",
The orientation or positional relationship of the instructions such as "top", "bottom" is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of retouching
It states the present invention and simplifies description, do not indicate or imply the indicated device or element must have a particular orientation, with specific
Azimuth configuration and operation, therefore be not considered as limiting the invention.In addition, term " first ", " second " are only used for retouching
Purpose is stated, relative importance is not understood to indicate or imply or implicitly indicates the quantity of indicated technical characteristic.By
This defines " first ", the feature of " second " can be expressed or what is implied includes one or more this feature.Moreover,
Term " first ", " second " etc. are for distinguishing similar object, without being used to describe specific sequence or precedence.It answers
The data that the understanding uses in this way can be interchanged in the appropriate case, so that the embodiment of the present invention described herein can be to remove
Sequence other than those of illustrating or describe herein is implemented.
As shown in Fig. 1, it is a kind of high-precision and high-stability temperature polling instrument of the present invention, including multiple temperature acquisition moulds
Block, reference voltage circuit, microcontroller, clock-reset circuit, communicating circuit and power circuit, the temperature collecting module respectively with
The multiple input end of the microcontroller is electrically connected, the clock-reset circuit and the monolithic mechatronics, the communicating circuit
With the monolithic mechatronics, the power circuit respectively with temperature collecting module, microcontroller and clock and reset circuit electricity
Connection.
The temperature collecting module includes thermal resistance, bridge resistor measuring circuit and A/D conversion circuits, the bridge resistor
Measuring circuit is electrically connected with the thermal resistance, and the input terminal of the A/D conversion circuits is electrically connected with the bridge resistor measuring circuit
Connect, the output end of the A/D conversion circuits is electrically connected with the input terminal of the microcontroller, the reference voltage circuit respectively with institute
State bridge resistor measuring circuit and A/D conversion circuits electrical connection.
The thermal resistance is PT25 platinum resistance, as shown in Fig. 2, the thermal resistance include outside protective pipe 1, quartzy skeleton 2,
The outer diameter of temperature-sensing element 3, insulating powder 4, platinum lead 5 and lug plate, the outside protective pipe 1 is 6mm, and the outside protective pipe 1 is
Quartz protecting tube, the outside protective pipe 1 seal and are filled with oxygenous inert gas, such as oxygenous helium, the stone
English skeleton 2 is set in the outside protective pipe 1, filled with insulation in the gap between the quartz skeleton 2 and the outside protective pipe 1
Powder 4, the insulating powder are the quartz powder of the magnesium oxide powder and 10-20% of 80-90%, wherein the magnesia powder
The granularity at end is 1000-2000 mesh, and the granularity of the quartz powder is 100-150 mesh, and the quartz skeleton 2 is set in an axial direction
There are two through-hole, the temperature-sensing element 3 is U-shaped, and the two-arm of the U-shaped temperature-sensing element is respectively arranged in two through-holes, institute
The length for stating temperature-sensing element 3 is 60mm, and the temperature-sensing element 3 is made of temperature-sensitive platinum filament, the temperature-sensitive platinum filament it is a diameter of
0.07mm, the temperature-sensitive platinum filament coiling is spiral, and 3 both ends of the temperature-sensing element are separately connected two platinum leads 5, described
The length of platinum lead 5 is 2000mm, and 5 other end of platinum lead connects the lug plate, and the lug plate is red copper lug plate.
The bridge resistor measuring circuit is as core measuring circuit, the bridge arm electricity using the thermal resistance as electric bridge
Resistance, circuit reduce the interference of other ground devices by the resistance eutral grounding of zero ohms, so that circuit work is more stablized.
It is a suitable high-acruracy survey application that the A/D conversion circuits, which use AD7793 type A/D chips, the chip,
Low-power consumption, low noise, full simulation front end, built-in low noise 16/24 ADC, be internally integrated low noise instrument in piece
Amplifier, therefore small signal can be directly inputted.
To eliminate the big problem of A/D built-in chip type reference voltage source noises, improving measurement accuracy, AD743REF196 bases are selected
Quasi- voltage chips provide 3.3V reference voltages.
Core of the microcontroller as control temperature collecting module, the model STM32F103RBT6 of use, high score
Resolution timer coordinates 16/24 A/D chip and realizes high-precision resistance measurement.
The communicating circuit is 485 communicating circuits, for the measurement data obtained from microcontroller to be uploaded to inspection in real time
Instrument host shows, stores.
Logging function is used and enriched for convenience, using the Industrial touch screen of embedded WinCE systems as logging host
Human-computer interaction, control core, touch screen control software is write using C#, control software is set with to be inspected respectively by 232 modes
The communication of standby and temperature polling instrument；Various control parameters and channel correction value, inspection can be arranged in user in touch screen control software
Instrument acquires the temperature value in each channel, charge value in real time, draws temperature curve, thermal field uniformity and fluctuation degree is calculated, by various realities
When parameter, data be intuitively shown to client.
Second aspect of the present invention discloses a kind of preparation method of thermal resistance in high-precision and high-stability temperature polling instrument, packet
Include following steps：
1) stringent cleaning and outside protective pipe 1 described in high-temperature roasting, quartzy skeleton 2, temperature-sensitive platinum filament, insulating powder 4, platinum lead
5 and lug plate；
2) the temperature-sensitive platinum filament described in coiling in a helical pattern in dustless incubator, the complete temperature-sensitive platinum filament of coiling is U-shaped, to disappear
Except generated stress is quickly cooled down under coiling deformation, vibrations or high temperature, around the first number of annealing at 680 DEG C of the temperature-sensitive platinum filament made
Hundred hours；
3) outside protective pipe 1, quartzy skeleton 2, temperature-sensitive platinum filament, insulating powder 4, platinum lead 5 are assembled in dustless incubator
And the two-arm of the temperature-sensitive platinum filament is placed in the through-hole of the quartzy skeleton 2, then in the temperature-sensitive platinum by lug plate first
Two platinum leads 5 are respectively welded in the two-arm end of silk, then the quartzy skeleton 2, temperature-sensitive platinum filament and platinum lead 5 are placed in institute
Outside protective pipe 1 is stated, then insulating powder 4 is filled at the gap position between quartzy skeleton 2 and outside protective pipe 1, is filled with protective gas,
It draws again, the other end of the platinum lead 5 is located at outside the outside protective pipe 1, and the lug plate is welded on the platinum lead 5
One end outside the outside protective pipe 1；
4) it after preparing the thermal resistance, anneals hundreds of hours in tin solidification point again, the resistance value of thermal resistance is made to keep
Stablize.
In room temperature and indium solidification point, the insulation between the platinum lead 5 and outside protective pipe 1 of thermal resistance is measured with 10V megameters
Resistance, value are more than 200M Ω, can prevent elements Shunt from bringing error.
Third aspect present invention discloses a kind of method for inspecting of high-precision and high-stability temperature polling instrument, including following step
Suddenly：
1) portable fixing point device is used to be demarcated to the logging in mercury three phase point to indium solidification point range, and
Multiple temperature collecting modules are modified, measurement error between multiple temperature collecting modules is eliminated, improves and measures essence
Degree；
2) the branched thermal resistance is separately fixed at according to cloth point diagram on the corresponding position of equipment to be inspected；
3) setting needs the temperature spot calibrated, software to automatically control experiment according to setting calibration point in touch screen control software
Box temperature degree judges thermal field fluctuation degree per minute in case, reaches and thinks in case that thermal field is stablized after arrange parameter requires, beginning according to
The collection period and acquisition time acquisition and recording data of setting, software acquires chamber indicating value simultaneously and logging acquisition is multiple logical
The temperature data in road, and by these data real-time displays and temperature curve is drawn, and be automatically saved in Access databases；
4) touch screen control software analyzes temperature curve, calculates thermal field fluctuation degree, uniformity and uncertainty；
5) after the completion of testing, the logging is demarcated again by portable fixing point device, verifies the inspection
The overall stability of instrument.
According to above-mentioned logging and method for inspecting, selects the temperature test chamber of volume 600L as the equipment to be inspected, be
Measurement accuracy is improved, logging is put into fixed point device before measuring, in mercury three phase point, water triple point, indium solidification point to the whole series
Device is demarcated, and is modified to each channel temperature acquisition module, it is ensured that logging measured value is accurate, eliminates interchannel and measures
Error.
With reference to《JJF1101-2003 environmental test equipment humiture calibrating standards》, as shown in Fig. 3, using 9 temperature spots
It layouts, being respectively placed in 9 temperature spots using 9 thermal resistances layouts；Setting needs the temperature calibrated in touch screen control software
Point is spent, software automatically controls chamber temperature according to setting calibration point, to be tested for the accurate thermal field index embodied in chamber
After case is substantially stabilized, start same according to the collection period (20s) and acquisition time (30min) acquisition and recording data, software of setting
When acquisition chamber indicating value and logging acquire 9 channels temperature data, and by these data real-time displays and draw temperature
Curve, and be automatically saved in database；Touch screen control software analyzes temperature curve, calculates thermal field fluctuation degree, uniform
Property and uncertainty.
After being measured, then logging is put into fixed point device, carried out in mercury three phase point, water triple point, indium solidification point
Calibration, verifies the stability of device, through actual verification, measures front and back each channel measurement variable quantity and is no more than 2mK.
With reference to《JJF1101-2003 environmental test equipment humiture calibrating standards》, inspection is carried out using following mathematical model
Instrument uncertainty research,
Δtd=td–to-Δto
In formula：ΔtdTemperature deviation, DEG C
tdDut temperature chamber indicating value, DEG C
toTemperature polling instrument indicating value, DEG C
ΔtoLogging correction value, DEG C
By analysis, logging uncertainty of measurement mostlys come from reading repeatability, the temperature of dut temperature chamber
The reading repeatability of logging, the directional error of temperature polling instrument obtain the uncertainty of measurement of logging by actual test
For 0.01 DEG C (k=2).
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (10)
1. a kind of high-precision and high-stability temperature polling instrument, including multiple temperature collecting modules, microcontroller, clock-reset circuit,
Communicating circuit and power circuit, the temperature collecting module is electrically connected with the multiple input end of the microcontroller respectively, when described
Clock reset circuit and the monolithic mechatronics, the communicating circuit and the monolithic mechatronics, the power circuit difference
It is electrically connected with reset circuit with temperature collecting module, microcontroller and clock, which is characterized in that the temperature collecting module includes
Thermal resistance, bridge resistor measuring circuit and A/D conversion circuits, the bridge resistor measuring circuit are electrically connected with the thermal resistance,
The input terminal of the A/D conversion circuits is electrically connected with the bridge resistor measuring circuit, the output end of the A/D conversion circuits with
The input terminal of the microcontroller is electrically connected.
2. a kind of high-precision and high-stability temperature polling instrument according to claim 1, which is characterized in that further include benchmark electricity
Volt circuit, the reference voltage circuit are electrically connected with the bridge resistor measuring circuit and the A/D conversion circuits respectively.
3. a kind of high-precision and high-stability temperature polling instrument according to claim 1, which is characterized in that the thermal resistance is
PT25 platinum resistance.
4. a kind of high-precision and high-stability temperature polling instrument according to claim 3, which is characterized in that the thermal resistance packet
Outside protective pipe (1), quartzy skeleton (2), temperature-sensing element (3), platinum lead (5) and lug plate are included, outside protective pipe (1) sealing is simultaneously
Be filled with oxygenous helium, the quartz skeleton (2) is set in the outside protective pipe (1), the quartz skeleton (2) with it is described
Insulating powder (4) is filled in gap between outside protective pipe (1), the quartz skeleton (2) is set in an axial direction there are two through-hole, the sense
Warm element (3) bends to U-shaped and is set in the through-hole, and temperature-sensing element (3) both ends are separately connected two platinum leads
(5), platinum lead (5) other end connects the lug plate.
5. a kind of high-precision and high-stability temperature polling instrument according to claim 4, which is characterized in that the insulating powder
(4) it is magnesia and quartzy mixed-powder.
6. a kind of high-precision and high-stability temperature polling instrument according to claim 4, which is characterized in that the outside protective pipe
(1) outer diameter is 5-8mm, and the length of the temperature-sensing element (3) is 50-70mm, and the length of the platinum lead (5) is 1500-
2500mm。
7. a kind of high-precision and high-stability temperature polling instrument according to claim 4, which is characterized in that the temperature-sensing element
(3) it is made of temperature-sensitive platinum filament, a diameter of 0.06-0.08mm of the temperature-sensitive platinum filament, the temperature-sensitive platinum filament coiling is spiral.
8. a kind of high-precision and high-stability temperature polling instrument according to claim 4, which is characterized in that the lug plate is
Red copper lug plate.
9. the preparation method of thermal resistance in a kind of high-precision and high-stability temperature polling instrument, which is characterized in that include the following steps：
1) it is respectively washed, outside protective pipe described in high-temperature roasting (1), quartz skeleton (2), temperature-sensitive platinum filament, insulating powder (4), platinum draw
Line (5) and lug plate；
2) the temperature-sensitive platinum filament described in coiling in dustless incubator is annealed hundreds of hours around the temperature-sensitive platinum filament made at 680 DEG C；
3) outside protective pipe (1), quartzy skeleton (2), temperature-sensitive platinum filament, insulating powder (4), platinum lead are assembled in dustless incubator
(5) and lug plate；
4) it after assembling the thermal resistance, anneals hundreds of hours in tin solidification point again.
10. a kind of method for inspecting of high-precision and high-stability temperature polling instrument, which is characterized in that include the following steps：
1) logging is demarcated using portable fixing point device, and multiple temperature collecting modules is repaiied
Just, measurement error between the multiple temperature collecting modules of elimination；
2) multiple thermal resistances are separately fixed at according to cloth point diagram on the corresponding position of equipment to be inspected；
3) the calibration temperature spot of equipment to be inspected is set, and equipment thermal field to be inspected starts collecting temperature data after stablizing；
4) temperature data acquired is uploaded to host by the communicating circuit, Framework computing temperature fluctuation, uniformity and not
Degree of certainty；
5) logging is demarcated again by portable fixing point device, verifies the overall stability of the logging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810707700.2A CN108613751A (en) | 2018-07-02 | 2018-07-02 | A kind of high-precision and high-stability temperature polling instrument and preparation method thereof, method for inspecting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540316A (en) * | 2019-01-22 | 2019-03-29 | 中国计量科学研究院 | A kind of self-calibration double-thermocouple thermometer and temp measuring method based on standard platinum resistance thermometer |
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| CN2047013U (en) * | 1989-05-29 | 1989-11-01 | 北京市海淀区东升测温元件厂 | Ceramic platinum resistance temp. surveying element |
| CN204314748U (en) * | 2015-01-06 | 2015-05-06 | 常州汇邦电子有限公司 | A kind of multipath temperature patrol inspection temp controlled meter |
| CN105784175A (en) * | 2016-04-26 | 2016-07-20 | 哈尔滨工程大学 | High-precision multipoint temperature measurement system based on WIFI communication |
| CN107192468A (en) * | 2017-06-12 | 2017-09-22 | 中国航发哈尔滨东安发动机有限公司 | A kind of high acquisition rate temp measuring system of multichannel |
| CN208350230U (en) * | 2018-07-02 | 2019-01-08 | 苏州市计量测试院 | A kind of high-precision and high-stability temperature polling instrument |
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| CN2047013U (en) * | 1989-05-29 | 1989-11-01 | 北京市海淀区东升测温元件厂 | Ceramic platinum resistance temp. surveying element |
| CN204314748U (en) * | 2015-01-06 | 2015-05-06 | 常州汇邦电子有限公司 | A kind of multipath temperature patrol inspection temp controlled meter |
| CN105784175A (en) * | 2016-04-26 | 2016-07-20 | 哈尔滨工程大学 | High-precision multipoint temperature measurement system based on WIFI communication |
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| CN109540316A (en) * | 2019-01-22 | 2019-03-29 | 中国计量科学研究院 | A kind of self-calibration double-thermocouple thermometer and temp measuring method based on standard platinum resistance thermometer |
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