CN110285895A - A kind of acquisition of temperature measurement utensil data and detection device and detection method - Google Patents

A kind of acquisition of temperature measurement utensil data and detection device and detection method Download PDF

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Publication number
CN110285895A
CN110285895A CN201910429503.3A CN201910429503A CN110285895A CN 110285895 A CN110285895 A CN 110285895A CN 201910429503 A CN201910429503 A CN 201910429503A CN 110285895 A CN110285895 A CN 110285895A
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China
Prior art keywords
value
temperature
resistance
platinum resistance
tested
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栾海峰
王建雷
刘晓辉
伊露璐
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Jiangsu Institute Of Econometrics (jiangsu Energy Measurement Data Center)
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Jiangsu Institute Of Econometrics (jiangsu Energy Measurement Data Center)
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Priority to CN201910429503.3A priority Critical patent/CN110285895A/en
Publication of CN110285895A publication Critical patent/CN110285895A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00Testing or calibrating of thermometers
    • G01K15/007Testing
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16Measuring 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
    • G01K7/18Measuring 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
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00Programme-control systems
    • G05B19/02Programme-control systems electric
    • G05B19/04Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423Input/output

Abstract

The invention discloses a kind of acquisitions of temperature measurement utensil data and detection device and detection method, and device includes thermostat, digital multimeter, data collecting plate card, standard platinum resistance thermometer, processing system;The thermostat is to provide stationary temperature;The standard platinum resistance thermometer and tested platinum resistance are arranged in thermostat;The standard platinum resistance thermometer is connected with digital multimeter;Resistance value of the digital multimeter to acquire standard platinum resistance thermometer;The tested platinum resistance is connected with data collecting card;The data collecting card is used to acquire the resistance value of tested platinum resistance;The thermostat, digital multimeter are used and data collecting card is connected with processing system;The processing system is used to for the resistance value of standard platinum resistance thermometer being converted into temperature value when thermostat corresponding temperature point, and determines tested platinum resistance;The measurement quality of temperature measurement can be improved in the present invention.

Description

A kind of acquisition of temperature measurement utensil data and detection device and detection method
Technical field
The invention belongs to temperature measurement detection technique field, especially a kind of temperature measurement utensil data acquisition is filled with detection It sets and detection method.
Background technique
Temperature is that a very important parameter, related data are shown in industrial production and scientific research: temperature detection is about The 50% of industrial detection sum is accounted for, the work of many systems is carried out within the scope of certain temperature, needs to measure temperature It is extremely extensive with the occasion of control temperature, so designing a kind of acquisition of temperature measurement utensil data not only has ten with detection system Divide important meaning, and the value that has a wide range of applications.Temperature acquisition traditional at present is typically all to pass through with detection device Hardware circuit and hardware device are realized, need additionally to configure dedicated scan switch also when carrying out multiplexed signal sampling to realize multichannel Signals collecting function.
Traditional temperature measurement utensil data acquisition and detection device at present, there are the problem of have: 1, apparatus function it is single, Bulky, not easily shifted and change, poor expandability can not carry out more applications.2, it is easy by external interference, performance is not Stablize, accuracy of data acquisition is lower.3, multiple signals asynchronous collecting need to be carried out by scanning switch, it can not synchronous acquisition multichannel letter Number, response speed is slow, low efficiency.4, intelligence degree is low, and operability is poor with flexibility.5, data storage and data at Reason, data analysis capabilities are poor.6, multichannel measurement reduces measurement quality using that can additionally introduce uncertainty when scanning switch.By In above-mentioned defect, many traditional temperature measurement utensil data acquisitions are unsatisfactory with the using effect of detection device, The practicability is poor.
Summary of the invention
The purpose of the present invention is to provide a kind of acquisitions of temperature measurement utensil data and detection device and detection method, to mention For the measurement quality of temperature measurement.
The technical solution for realizing the aim of the invention is as follows:
A kind of acquisition of temperature measurement utensil data and detection device, including thermostat, digital multimeter, data acquisition board Card, standard platinum resistance thermometer, processing system;
The thermostat is to provide stationary temperature;The standard platinum resistance thermometer and tested platinum resistance are arranged at In thermostat;The standard platinum resistance thermometer is connected with digital multimeter;The digital multimeter is to acquire standard platinum electricity Hinder the resistance value of thermometer;The tested platinum resistance is connected with data collecting card;The data collecting card is for acquiring tested platinum The resistance value of resistance;The thermostat, digital multimeter are used and data collecting card is connected with processing system;The processing system Temperature value for being converted into the resistance value of standard platinum resistance thermometer when thermostat corresponding temperature point t obtains setting time Temperature fluctuation value in section M;And by temperature fluctuation value and given threshold tlimCompare;If being less than given threshold tlim, continue falling It counts in period N, by temperature fluctuation value and given threshold tlimCompare, if being less than given threshold, acquires standard platinum resistance thermometer Resistance value and tested platinum resistance resistance value;According to the normal temperature value of set temperature point t, standard electric resistance value, tested resistance Value corrects the resistance value of tested platinum resistance;And tested platinum resistance is determined.
A kind of temperature measurement utensil data detection method, comprising the following steps:
Step 1, given threshold tlim, period M, section N between countdown;
Step 2 carries out data acquisition, the resistance value of standard platinum resistance thermometer is converted to temperature value, and calculate setting Temperature fluctuation value in period M;
Step 3 determines, the standard platinum resistance temperature in temperature collection stage whether stable in the temperature value of set temperature point t The resistance value of the resistance value of meter and tested platinum resistance;
Step 4 calculates revised tested resistance value: according to 0 DEG C, 100 DEG C of normal temperature value, standard electric resistance value, quilt Resistance value is examined, 0 DEG C, 100 DEG C of revised tested resistance values are calculated separately;
Step 5, to tested platinum resistance, whether qualification determines.
Compared with prior art, the present invention its remarkable advantage is:
(1) temperature measurement utensil data of the invention acquisition and detection device and detection method, acquire standard platinum resistance temperature The resistance value of meter and the resistance value of tested platinum resistance are spent, according to the normal temperature value of set temperature point, standard electric resistance value, tested electricity Resistance value is corrected the resistance value of tested platinum resistance, can be determined tested platinum resistance.
(2) temperature measurement utensil data of the invention acquisition and detection device and detection method, by obtaining setting time Temperature fluctuation value in section;And by temperature fluctuation value compared with given threshold;The comparison of section between countdown is carried out again, and acquisition is stablized The resistance value of the resistance value of the standard platinum resistance thermometer in stage and tested platinum resistance, test result are more accurate.
(3) temperature measurement utensil data of the invention acquisition and detection device and detection method, can also be to tested platinum resistance Grade determined, the essential information of standard platinum resistance thermometer and tested platinum resistance can be stored, each set temperature point is deposited The information such as the standard electric resistance value of storage, tested resistance value, testing result are stored, and the detection note of tested platinum resistance is automatically generated Record.
(4) temperature measurement utensil data of the invention acquisition and detection device and detection method, are equipped with multiple data and acquire The slot of board, extension are convenient;Multiple standard platinum resistance temperature can be acquired simultaneously by digital multimeter and data collecting plate card The relevant parameter of meter and tested platinum resistance.
Detailed description of the invention
Fig. 1 is the structure diagram of data acquisition and detection device.
Specific embodiment
With reference to the accompanying drawing and specific embodiment is described further the present invention.
In conjunction with Fig. 1, a kind of temperature measurement utensil data acquisition of the invention and detection device, including thermostat, number are more With table, data collecting plate card, standard platinum resistance thermometer, tested platinum resistance, processing system;
The thermostat is to provide stationary temperature;The standard platinum resistance thermometer and tested platinum resistance are arranged at In thermostat;The standard platinum resistance thermometer is connected with digital multimeter;The digital multimeter is to acquire standard platinum electricity Hinder the resistance value (standard electric resistance value) of thermometer;The tested platinum resistance is connected with data collecting card;The data collecting card is used In the resistance value (tested resistance value) for acquiring tested platinum resistance;The thermostat, digital multimeter and data collecting card pass through I/O interface is connected with processing system;The processing system is used to the resistance value of standard platinum resistance thermometer being converted into thermostat Temperature value (normal temperature value) when corresponding temperature point t obtains the temperature fluctuation value in set period of time M;And by temperature fluctuation Value and given threshold tlimCompare;If being less than given threshold tlim, continue between countdown in section N, by temperature fluctuation value and setting Threshold value tlimCompare, if being less than given threshold, acquires the resistance value of standard platinum resistance thermometer and the resistance value of tested platinum resistance; According to the normal temperature value of set temperature point t, standard electric resistance value, tested resistance value, the resistance value of tested platinum resistance is corrected;And it is right Tested platinum resistance is determined.
Further, the thermostat is controlled by temperature controller carries out heating and cooling and by the temperature of liquid medium in thermostat Stablize near set temperature point T, to provide stationary temperature.
The processing system uses computer, including initialization module, parameter configuration module, data processing module, data Detection module;
The initialization module connects for initialization process system and the I/O of thermostat, digital multimeter, data collecting card The communication state of mouth, it is ensured that communication state is normal, so that it is guaranteed that detection device performance is stable, reliable.
The initialization module sends initialization directive, if feedback information can be received, each interface communication to each I/O interface State is normal, if not receiving feedback information, communication state is abnormal, need to check retransmit after debugging initialization directive into Row communication state confirmation, until confirming that the communication state of all I/O interfaces is normal.
The parameter configuration module is used to configure the address of thermostat, digital multimeter, data collecting card, configures quilt Standard platinum resistance thermometer, the essential information (factory number, model specification, manufacturer etc.) for examining platinum resistance, threshold value tlimSet The setting of section N between the fixed, setting of period M, countdown.
The data processing module is used to being converted to the resistance value of standard platinum resistance thermometer into temperature value, when calculating setting Between temperature fluctuation value in section M;And by temperature fluctuation value and given threshold tlimCompare, determines whether temperature value is stable;It acquires small In given threshold tlimStandard platinum resistance thermometer resistance value and tested platinum resistance resistance value.
Further, the data processing module includes Data Computation Unit, judging unit, acquisition unit;
The Data Computation Unit calculates setting the resistance value of standard platinum resistance thermometer is converted to temperature value Temperature fluctuation value in period M.
Detailed process is as follows: the Data Computation Unit is according to formula (1), (2), (3) by standard platinum resistance thermometer Resistance value) be converted to corresponding temperature value;
Wherein, Wr(t)=W (t)-a [W (t) -1]-b [W (t) -1]2-c[W(t)-1]3 (2)
W (t)=R (t)/R (0.01 DEG C) (3)
Wherein tsFor the mark temperature value that standard platinum resistance thermometer measures, D0、DiFor the conversion coefficient of standard platinum resistance, A, b, c are the characteristic coefficient (can be checked in by the calibration certificate of standard platinum resistance thermometer) of standard platinum resistance thermometer, Wr(t) it is The reference function of standard platinum resistance thermometer, W (t) are resistance value R (t) and water of the standard platinum resistance thermometer in set temperature t The ratio of the resistance value R (0.01 DEG C) of triple point (0.01 DEG C).
Calculate the temperature fluctuation value t in set period of time Mwav:
twav=tmax-tmin (4)
Wherein tmaxFor the maximum value in collected multiple temperature values in nearest period M, tminFor in nearest period M Minimum value in collected multiple temperature values.
The judging unit is for judging whether the temperature value of set temperature point t is stable, and detailed process is as follows:
By temperature fluctuation value twavWith given threshold tlimCompare, if more than given threshold tlimThen continue to judge, be set if being less than Determine threshold value tlim, then start the countdown of N period and continue to judge:
If temperature fluctuation value twavIt is greater than given threshold t during countdown period Nlim, then countdown is exited, again Start aforesaid intervals M stablizes judgement;If being less than given threshold tlim, after countdown, acquisition unit acquires standard platinum electricity Hinder the resistance value of thermometer and the resistance value of tested platinum resistance.
The judging unit judge countdown using duration threshold, can abundant lifting device anti-interference, improve and acquire Uncertainty of measurement is effectively reduced in precision, improves measurement quality.
The data detection module is used to correct the resistance value of inspection platinum resistance, and whether qualification is sentenced to tested platinum resistance It is fixed.
Further, the data detection module includes temperature adjustmemt unit, judging unit:
The temperature adjustmemt unit is used for according to the normal temperature value of set temperature point t, standard electric resistance value, tested resistance Value, the resistance value of amendment inspection platinum resistance.The temperature adjustmemt unit calculates revised tested resistance value according to formula (5):
R=Ri-(ts-tn)*(dR/dt) (5)
Wherein R is the resistance value of revised tested platinum resistance, RiFor the resistance value of the tested platinum resistance measured, tnIt runs after fame Adopted temperature value, dR/dt are the corresponding temperature-coefficient of electrical resistance of nominal temperature value.
The judging unit is determined for being detected platinum resistance and exports judgement result: according to formula (6), (7) to quilt Inspection platinum resistance is determined:
Rmin≤R≤Rmax (6)
Δαmin≤Δα≤Δαmax (7)
Wherein Δ α is temperature-coefficient of electrical resistance deviation;Rmax、RminThe resistance value R's of respectively revised tested platinum resistance Upper limit threshold and lower threshold;Δαmax、ΔαminThe respectively upper limit threshold and lower threshold of temperature-coefficient of electrical resistance deviation delta alpha.
If meeting formula (6), (7), it is detected resistance qualification, if not satisfied, then unqualified.
Further, the judging unit can also grade to tested platinum resistance, and detailed process is as follows:
If measurement result meets formula (8), (9), (10) simultaneously, it is determined as A grades:
99.941Ω≤R0≤100.059Ω (8)
138.373Ω≤R100≤138.639Ω (9)
(-7-23Δt0)×10-6≤Δα≤(7-23Δt0)×10-6 (10)
If measurement result meets formula (11), (12), (13) simultaneously, it is determined as B grades:
99.883Ω≤R0≤100.117Ω (11)
138.203Ω≤R100≤138.809Ω (12)
(-14-21Δt0)×10-6≤Δα≤(14-21Δt0)×10-6 (13)
In formula, Δ t0For the temperature deviation value that standard platinum resistance thermometer is measured at 0 DEG C (i.e. t=0), R100It is 100 DEG C The resistance value of (i.e. t=100) revised tested platinum resistance, R0For the resistance value of 0 DEG C of revised tested platinum resistance.
Wherein Δ α=(R100-R0)/(R0*100)-0.003851 (14)
Further, the processing system further includes data memory module, and the data memory module is to match parameter Set the essential information of the standard platinum resistance thermometer configured in module and tested platinum resistance, the standard of each set temperature point t storage The information such as resistance value, tested resistance value, testing result are stored, and the detection record of tested platinum resistance is automatically generated.
A kind of temperature data acquisition and detection method of the realization based on above-mentioned temperature data acquisition and detection device, including Following steps:
Step 1, connect data collecting card, the power supply of digital multimeter is preheated, and the function of digital multimeter is set It is set to four-wire system electrical resistance collection (FRES), power frequency period number (NPLC) is set as 1, and range (RANGE) is set as 100 Ω, data Position (DIGIT) is set as 8.
Power frequency period number (NPLC) is set as 1 and sets the sampling period of digital multimeter to 0.02 second, i.e., in 1 second Digital multimeter can acquire 50 standard electric resistance values, and each collected effective resistance value uses the calculation of 50 resistance values in 1 second Art average value filters out the stray data generated by external disturbance, it can be achieved that mean filter, improves accuracy of data acquisition.
Step 2, starting initialization module, send initialization directive to each I/O interface, if feedback information can be received, respectively Interface communication state is normal, if not receiving feedback information, communication state is abnormal, retransmits initially after needing to check debugging Change instruction and carry out communication state confirmation, until confirming that the communication state of all I/O interfaces is normal.
Step 3, configuration thermostat, digital multimeter, data collecting card address, configuration standard platinum resistance temperature later The essential information (factory number, model specification, manufacturer etc.) of degree meter, tested platinum resistance.Given threshold tlim, setting time Section M=10 minutes;Section N=2 minutes between setting countdown.
Step 4 carries out data acquisition, the resistance value of standard platinum resistance thermometer is converted to temperature value, and calculate setting Temperature fluctuation value in period M:
4.1,0 DEG C is set by thermostat target temperature, starting digital multimeter acquires standard platinum electric thermometer resistance value While, log-on data capture card acquires the resistance value of tested platinum resistance.
4.2, the resistance value of standard platinum resistance thermometer is converted into corresponding temperature value according to formula (1), (2), (3);
Wherein, Wr(t)=W (t)-a [W (t) -1]-b [W (t) -1]2-c[W(t)-1]3 (2)
W (t)=R (t)/R (0.01 DEG C) (3)
4.3, the temperature fluctuation value t in set period of time M is calculatedwav:
twav=tmax-tmin (4)
T at this timewavFor the temperature fluctuation value in M=10 minutes nearest, tmaxIt is collected multiple in M=10 minutes nearest Maximum value in temperature value, tminFor the minimum value in collected multiple temperature values in M=10 minutes nearest.
Step 5 determines, the standard platinum resistance temperature in temperature collection stage whether stable in the temperature value of set temperature point t The resistance value of the resistance value of meter and tested platinum resistance:
5.1, judge whether 0 DEG C of temperature value is stable: thermostat temperature set temperature point t is arranged at 0 DEG C;Judge temperature Undulating value twavWhether given threshold t is less thanlim, if more than given threshold tlimThen continue to judge, if being less than given threshold tlim, then Start countdown in N=2 minutes and continue to judge:
If temperature fluctuation value twavIt is greater than given threshold t during countdown period Nlim, then countdown is exited, again Start aforesaid intervals M stablizes judgement;If being less than given threshold tlim, after countdown in 2 minutes, acquire standard platinum resistance The resistance value of the resistance value of thermometer and tested platinum resistance.
5.2, determine whether 100 DEG C of temperature value is stable: specific direction is same as above, and details are not described herein again.
Step 6 calculates revised tested resistance value: according to 0 DEG C, 100 DEG C of normal temperature value, standard electric resistance value, quilt Resistance value is examined, calculates separately 0 DEG C, 100 DEG C of revised tested resistance values according to formula (5):
R=Ri-(ts-tn)*(dR/dt) (5)
Step 7, to tested platinum resistance, whether qualification determines: according to 0 DEG C, 100 DEG C of revised tested resistance values;If The corresponding revised resistance value of two temperature spots is all satisfied formula (6), (7), then is determined as qualification:
Rmin≤R≤Rmax (6)
Δαmin≤Δα≤Δαmax (7)
If not satisfied, then unqualified.
Step 8 grades to tested platinum resistance:
If measurement result meets formula (8), (9), (10) simultaneously, it is determined as A grades:
99.941Ω≤R0≤100.059Ω (8)
138.373Ω≤R100≤138.639Ω (9)
(-7-23Δt0)×10-6≤Δα≤(7-23Δt0)×10-6 (10)
If measurement result meets formula (11), (12), (13) simultaneously, it is determined as B grades:
99.883Ω≤R0≤100.117Ω (11)
138.203Ω≤R100≤138.809Ω (12)
(-14-21Δt0)×10-6≤Δα≤(14-21Δt0)×10-6 (13)
In formula, Δ t0For the temperature deviation value that standard platinum resistance thermometer is measured at 0 DEG C (i.e. t=0), R100It is 100 DEG C The resistance value of (i.e. t=100) revised tested platinum resistance, R0For the resistance value of 0 DEG C of revised tested platinum resistance.
Wherein Δ α=(R100-R0)/(R0*100)-0.003851 (14)。
Since A grades of upper limit thresholds and lower threshold range are less than B grades, then determine A grades due to B grades.
Step 9, by the essential information of the standard platinum resistance thermometer configured in parameter configuration module and tested platinum resistance, each N group standard electric resistance value, the N group of the corresponding storage of set temperature point are detected the information such as resistance value, testing result and are stored, and generate quilt Examine the detection record of platinum resistance.
The acquisition of temperature measurement utensil data and detection device and detection method of the invention, acquires standard platinum resistance thermometer Resistance value and tested platinum resistance resistance value, according to the normal temperature value of set temperature point, standard electric resistance value, tested resistance Value is corrected the resistance value of tested platinum resistance, can be determined tested platinum resistance.By obtaining the temperature in set period of time Undulating value;And by temperature fluctuation value compared with given threshold;The comparison for carrying out section between countdown again, acquires the standard of stabilization sub stage The resistance value of the resistance value of platinum resistance thermometer and tested platinum resistance, test result are more accurate.It can also be to tested platinum resistance Grade is determined, essential information, the storage of each set temperature point of standard platinum resistance thermometer and tested platinum resistance can be stored Standard electric resistance value, the information such as tested resistance value, testing result stored, automatically generate the detection record of tested platinum resistance. Slot equipped with multiple data collecting plate cards, extension are convenient;It can be acquired simultaneously by digital multimeter and data collecting plate card more The relevant parameter of a standard platinum resistance thermometer and tested platinum resistance.

Claims (9)

1. a kind of temperature measurement utensil data acquisition and detection device, which is characterized in that including thermostat, digital multimeter, number According to analog input card, standard platinum resistance thermometer, processing system;
The thermostat is to provide stationary temperature;The standard platinum resistance thermometer and tested platinum resistance are arranged at constant temperature In slot;The standard platinum resistance thermometer is connected with digital multimeter;The digital multimeter is to acquire standard platinum resistance temperature Spend the resistance value of meter;The tested platinum resistance is connected with data collecting card;The data collecting card is for acquiring tested platinum resistance Resistance value;The thermostat, digital multimeter are used and data collecting card is connected with processing system;The processing system is used for The resistance value of standard platinum resistance thermometer is converted into temperature value when thermostat corresponding temperature point t, is obtained in set period of time M Temperature fluctuation value;And by temperature fluctuation value and given threshold tlimCompare;If being less than given threshold tlim, continue between countdown In section N, by temperature fluctuation value and given threshold tlimCompare, if being less than given threshold, acquires the resistance of standard platinum resistance thermometer The resistance value of value and tested platinum resistance;According to the normal temperature value of set temperature point t, standard electric resistance value, tested resistance value, amendment The resistance value of tested platinum resistance;And tested platinum resistance is determined.
2. temperature measurement utensil data acquisition according to claim 1 and detection device, which is characterized in that the processing system System includes initialization module, parameter configuration module, data processing module, data detection module;
The initialization module for initialization process system and thermostat, digital multimeter, data collecting card communication state;
The parameter configuration module is used for threshold value tlimSetting, the setting of period M, between countdown section N setting;
The data processing module is used to being converted to the resistance value of standard platinum resistance thermometer into temperature value, calculates set period of time Temperature fluctuation value in M;And by temperature fluctuation value and given threshold tlimCompare, determines whether temperature value is stable;Acquisition, which is less than, to be set Determine threshold value tlimStandard platinum resistance thermometer resistance value and tested platinum resistance resistance value.
The data detection module is used to correct the resistance value of inspection platinum resistance, and whether qualification determines to tested platinum resistance.
3. the acquisition of temperature measurement utensil data and detection device according to claim 2, which is characterized in that the data processing Module includes Data Computation Unit, judging unit, acquisition unit;
The Data Computation Unit calculates setting time the resistance value of standard platinum resistance thermometer is converted to temperature value Temperature fluctuation value in section M:
Wherein tsFor the mark temperature value that standard platinum resistance thermometer measures, D0、DiFor the conversion coefficient of standard platinum resistance, Wr(t) For the reference function of standard platinum resistance thermometer;
Calculate the temperature fluctuation value t in set period of time Mwav:
twav=tmax-tmin (4)
Wherein tmaxFor the maximum value in collected multiple temperature values in nearest period M, tminTo be acquired in nearest period M To multiple temperature values in minimum value;
The judging unit is for judging whether the temperature value of set temperature point t is stable:
By temperature fluctuation value twavWith given threshold tlimCompare, if more than given threshold tlimThen continue to judge, if being less than setting threshold Value tlim, then start the countdown of N period and continue to judge:
If temperature fluctuation value twavIt is greater than given threshold t during countdown period Nlim, then countdown is exited, is restarted Aforesaid intervals M's stablizes judgement;If being less than given threshold tlim, after countdown, acquisition unit acquires standard platinum resistance temperature Spend the resistance value of meter and the resistance value of tested platinum resistance;
The judging unit judge countdown using duration threshold, can abundant lifting device anti-interference, raising acquisition precision, Uncertainty of measurement is effectively reduced, improves measurement quality.
4. the acquisition of temperature measurement utensil data and detection device according to claim 2, which is characterized in that the Data Detection Module includes temperature adjustmemt unit, judging unit;
The temperature adjustmemt unit is used to be repaired according to the normal temperature value of set temperature point t, standard electric resistance value, tested resistance value The resistance value R of positive inspection platinum resistance:
R=Ri-(ts-tn)*(dR/dt) (5)
Wherein RiFor the resistance value of the tested platinum resistance measured, tnFor nominal temperature value, dR/dt is the corresponding electricity of nominal temperature value Hinder temperature coefficient;
The judging unit is determined for being detected platinum resistance and exports judgement result: according to formula (6), (7) to tested platinum Resistance is determined:
Rmin≤R≤Rmax (6)
Δαmin≤Δα≤Δαmax (7)
If meeting formula (6), (7), it is detected resistance qualification, if not satisfied, then unqualified;
Wherein Δ α is temperature-coefficient of electrical resistance deviation;Rmax、RminThe upper limit of the resistance value R of respectively revised tested platinum resistance Threshold value and lower threshold;Δαmax、ΔαminThe respectively upper limit threshold and lower threshold of temperature-coefficient of electrical resistance deviation delta alpha.
5. the acquisition of temperature measurement utensil data and detection device according to claim 4, which is characterized in that the judging unit It can also grade to tested platinum resistance, detailed process is as follows:
If measurement result meets formula (8), (9), (10) simultaneously, it is determined as A grades:
99.941Ω≤R0≤100.059Ω (8)
138.373Ω≤R100≤138.639Ω (9)
(-7-23Δt0)×10-6≤Δα≤(7-23Δt0)×10-6 (10)
If measurement result meets formula (11), (12), (13) simultaneously, it is determined as B grades:
99.883Ω≤R0≤100.117Ω (11)
138.203Ω≤R100≤138.809Ω (12)
(-14-21Δt0)×10-6≤Δα≤(14-21Δt0)×10-6 (13)
In formula, Δ t0The temperature deviation value measured for standard platinum resistance thermometer at 0 DEG C, R100It is revised tested for 100 DEG C The resistance value of platinum resistance, R0For the resistance value of 0 DEG C of revised tested platinum resistance.
6. the detection method of temperature measurement utensil data acquisition and detection device according to claim 1-5, It is characterized in that, comprising the following steps:
Step 1, given threshold tlim, period M, section N between countdown;
Step 2 carries out data acquisition, the resistance value of standard platinum resistance thermometer is converted to temperature value, and calculate setting time Temperature fluctuation value in section M;
Whether the temperature value of step 3, judgement in set temperature point t is stable, the standard platinum resistance thermometer in temperature collection stage The resistance value of resistance value and tested platinum resistance;
Step 4 calculates revised tested resistance value: according to 0 DEG C, 100 DEG C of normal temperature value, standard electric resistance value, tested electricity Resistance value calculates separately 0 DEG C, 100 DEG C of revised tested resistance values;
Step 5, to tested platinum resistance, whether qualification determines.
7. detection method according to claim 6, which is characterized in that step 4 specifically includes the following steps:
Step 4.1 sets thermostat target temperature to 0 DEG C, acquires standard platinum electric thermometer resistance value and tested platinum resistance Resistance value;
The resistance value of standard platinum resistance thermometer is converted to corresponding temperature value by step 4.2;
Temperature fluctuation value t in step 4.3, calculating set period of time Mwav:
twav=tmax-tmin (4)。
8. detection method according to claim 6, which is characterized in that step 5 specifically includes the following steps:
Step 5.1 judges whether 0 DEG C of temperature value is stable: thermostat temperature set temperature point t is arranged at 0 DEG C;Judge temperature Undulating value twavWhether given threshold t is less thanlim, if more than given threshold tlimThen continue to judge, if being less than given threshold tlim, then Start the countdown of N period and continue to judge:
If temperature fluctuation value twavIt is greater than given threshold t during countdown period Nlim, then countdown is exited, is restarted Aforesaid intervals M's stablizes judgement;If being less than given threshold tlim, after countdown, acquire the electricity of standard platinum resistance thermometer The resistance value of resistance value and tested platinum resistance;
Step 5.2 determines whether 100 DEG C of temperature value is stable.
9. detection method according to claim 6, which is characterized in that it is specific that step 6 calculates revised tested resistance value Are as follows:
R=Ri-(ts-tn)*(dR/dt) (5)。
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Application publication date: 20190927