CN103234662A - Compensation method for automatic temperature detection and automatic temperature detection system - Google Patents
Compensation method for automatic temperature detection and automatic temperature detection system Download PDFInfo
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- CN103234662A CN103234662A CN2013101597443A CN201310159744A CN103234662A CN 103234662 A CN103234662 A CN 103234662A CN 2013101597443 A CN2013101597443 A CN 2013101597443A CN 201310159744 A CN201310159744 A CN 201310159744A CN 103234662 A CN103234662 A CN 103234662A
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Abstract
The invention relates to a compensation method for automatic temperature detection and an automatic temperature detection system. According to the method, the temperature is risen for detection by using a water bath constant temperature heating method, a static characteristic value of a temperature sensor is calibrated by using a liquid thermometer, and the time constant and the compensation function of each heat transfer characteristic are determined by using a three-order system formed by connecting three first-order systems in series and a first-order inertial system with pure lag respectively. The system is formed by connecting a constant current source, a temperature sensor, a signal conditioning amplifier, an A/D (Analog/Digital) converter, a single-chip microprocessor and a computer. The automatic temperature detection system has the characteristics that the dynamic characteristic of the automatic temperature detection system approaches the liquid thermometer, and the calibration of the detection instrument parameters can be finished by only performing experimental calibration once according to the characteristic that the automatic temperature detection system with the temperature sensor of the same type has the same transfer function in a relatively stable experimental environment, so that the accuracy and the convenience of the system are improved.
Description
Technical field
The present invention relates to compensation method and temperature automatic checkout system that a kind of sensing observation and control technology, particularly a kind of temperature detect automatically, be applied in the automatic accurate detection range of temperature.
Background technology
In the national examination criteria of temperature correlation, temperature parameter is demarcated by liquid-filled thermometer.Along with the robotization detecting instrument replaces manual instrument gradually, adopting the temperature automatic checkout system to replace liquid-filled thermometer is trend of the times.Existing temperature automatic checkout system is to vary with temperature characteristic according to temperature sensor when measuring temperature, draws a temperature variation curve, in conjunction with the liquid-filled thermometer measurement result, some points of temperature variation curve is demarcated.According to selecting properties of product and measurement standard difference, testing sample need select different rates to heat up, the different characteristic temperature spot is revised, and it is identical with the liquid-filled thermometer reading to make its this moment system for detecting temperature measure temperature results, again the consecutive point temperature is carried out linearity correction.This modification method requires test product to detect under given conditions, and both dynamic perfromance differences are particularly outstanding when rapid temperature rise and drop, cause measuring result error easily.This selection distinct temperature point reaches linear calibration's the mode that adopts between points, significant limitation is arranged, and need revise one by one each system for detecting temperature, so that the temperature automatic checkout system reaches consistent with the liquid-filled thermometer measurement, use inconvenient.
Summary of the invention
The object of the invention is to provide a kind of temperature compensation method and the temperature automatic checkout system of detection automatically, by the temperature automatic checkout system is carried out temperature compensation, it is consistent that temperature automatic checkout system dynamic perfromance and liquid-filled thermometer measurement are bordering on, and realizes that temperature accurately detects automatically.
Technical solution of the present invention is: the compensation method that a kind of temperature detects automatically is characterized in that
A, employing constant temperature water bath heating make the temperature automatic checkout system heat up with constant rate of speed, carry out temperature detection;
B, utilize liquid-filled thermometer to demarcate the static nature value of temperature sensor;
The heat transfer characteristic of C, temperature sensor and liquid-filled thermometer adopts the transport function of determining the third-order system that three first-order systems are in series and the one order inertia system that has pure hysteresis separately respectively, find the solution by PC Tools language MATLAB analysis temperature response curve and experimental data match, determine time constant separately;
D, introducing compensation tache approach liquid-filled thermometer temperature dynamic characteristic with temperature automatic checkout system temperature dynamic characteristic, utilize the series connection of three first derivative elements and a first order inertial loop, determine penalty function; Time constant with the penalty function of computing machine implementation language MATLAB is done small adjustment, and repetition test is revised the parameter of penalty function, obtains better match and approaches effect.
A kind of temperature automatic checkout system, it is characterized in that this system is connected and composed by constant current source, temperature sensor, signal condition amplifier, A/D converter, single-chip microcomputer, computing machine, by single-chip microcomputer temperature sensor is carried out timing acquiring, and the data of gathering are carried out Nonlinear Processing, send to computing machine by serial line interface then.
Described temperature sensor is by platinum resistance thermometer sensor, silk, sheath, insulation framework, adiabatic fibrous asbestos and lead-in wire constitute, be positioned at coiling platinum resistance thermometer sensor, silk on the insulation framework of sheath, be connected with lead-in wire on the platinum resistance thermometer sensor, silk, between sheath and insulation framework, be filled with adiabatic fibrous asbestos.
Characteristics of the present invention are: this compensation method can approach liquid-filled thermometer with temperature automatic checkout system dynamic perfromance, temperature automatic checkout system identical characteristics of transport function in metastable experimental situation according to same model temperature sensor, only need once test calibration and can finish demarcation to the detecting instrument parameter, accuracy and the convenience of the automatic detected temperatures of raising system.
Description of drawings
Fig. 1 is temperature automatic checkout system synoptic diagram of the present invention;
Fig. 2 is arrangement of temperature sensor synoptic diagram of the present invention;
Fig. 3 is temperature automatic checkout system temperature-time response characteristic curve map of the present invention;
Fig. 4 is No. 1 mercury thermometer temperature response curve of GB of the present invention figure;
Fig. 5 is third-order system fitting result of the present invention and actual measured results comparison diagram;
Fig. 6 is the enlarged drawing in O zone among Fig. 5;
Fig. 7 is compensation tache system chart of the present invention;
Fig. 8 is that the present invention introduces automatic temperature monitoring system actual measurement temperature curve comparison diagram behind the penalty function.
Embodiment
The invention will be further described below in conjunction with accompanying drawing:
As shown in Figure 1, 2, the constant current source of temperature automatic checkout system (6) is made up of stable reference voltage source, transport and placing device and resistance.The stable reference voltage source provides for LM236-2.5V, for system equipment provides constant electric current, adopts high precision low temperature to float amplifier OP07 and makes up operational amplifier.Temperature sensor (7) output is connected with signal condition amplifier (8), and signal condition amplifier (8) uses the AD620 instrument amplifier.A/D converter (9) is formed for single-chip microcomputer (10) MSP430F169 inside carries 12 high-speed ADCs, coding drives single-chip microcomputer MSP430F169(10) temperature sensor Pt 100 is carried out 10ms time interval timing acquiring, and measurement data carried out Nonlinear Processing, send to computing machine (11) by serial line interface then, the measurement data that computing machine (11) is uploaded single-chip microcomputer (10) records and data are handled.When using this system, at first use the high precision variable rheostat that constant current source (6) to A/D converter (9) is carried out twice demarcation, then temperature sensor (7) is carried out static shift correction under a plurality of temperature constant states.
Temperature sensor is selected Pt100 for use, its structure is that insulation framework (3) goes up coiling platinum resistance thermometer sensor, silk (1), platinum resistance thermometer sensor, silk (1) line directly is 0.05～0.07mm, be connected with silver wire (5) on the platinum resistance thermometer sensor, silk (1), the input and output side of silver wire (5) is connected with signal condition amplifier (8) with constant current source (6) respectively.Being provided with protective metal shell (2) in insulation framework (3) outside is stainless steel sheath, and diameter is Φ 4mm, length 75mm.Be filled with adiabatic fibrous asbestos (4) between protective metal shell (2) and the insulation framework (3).
Present embodiment selects for use fluid temperature to count No. 1 mercury thermometer of GB.Adopting following method that temperature is detected automatically compensates:
1, the temperature automatic checkout system adopts the constant temperature water bath heating, carry out temperature detection with per 10 ℃ constant rate of speed intensification condition, the quiescent value of at first using No. 1 mercury thermometer of GB to demarcate temperature sensor Pt100, concrete operation method is: open the temperature automatic checkout system, preheating 10 minutes makes the temperature automatic checkout system reach steady-working state.Adopt well heater heating container water then, insert No. 1 mercury thermometer of temperature sensor Pt100 and GB simultaneously, count standard with No. 1 mercury temperature of GB during heating, get 0 ℃, 10 ℃, 20 ℃ ..., 100 ℃ of totally 11 temperature environments, the quiescent value of demarcating temperature sensor Pt100.
Next carries out No. 1 mercury thermometer of GB and temperature sensor Pt100 quiescent value is carried out verification, concrete operation method is: Pt100 places room temperature with temperature sensor, make it reach heat and transmit balance, according to No. 1 mercury thermometer displays temperature of GB, when temperature no longer changed, temperature sensor pt100 eigenwert was inserted temperature sensor in the boiling water rapidly during the computer recording room temperature, insertion depth 15mm, and write down this constantly; When temperature no longer changes, temperature sensor pt100 quiescent value during computer recording boiling water.
2, according to temperature sensor and liquid-filled thermometer structure, heat transfer characteristic to both adopts the definite transport function separately of three first-order systems third-order system that is in series and the one order inertia system that has pure hysteresis respectively, find the solution by PC Tools language MATLAB analysis temperature response curve and experimental data match, determine temperature sensor and liquid-filled thermometer transport function time constant, concrete steps are:
1) with temperature sensor Pt100(7) be arranged in the detected equipment that heating environment employing constant speed heats up, constant speed is lowered the temperature, heat is passed to platinum resistance thermometer sensor, silk (1) through stainless steel sheath (2) and adiabatic fibrous asbestos (4), regard heat transmission each time as an one order inertia system that has pure hysteresis, then temperature sensor Pt100 can regard the third-order system that three first-order systems are in series as, and temperature sensor Pt100 transport function is
In the formula,
Be the transport function of temperature sensor Pt100,
Be the scale-up factor of i rank heat transfer system,
Be the time constant of i rank heat transfer system,
Be the retardation time of i rank heat transfer system.Because temperature sensor is in the environment of constant speed intensification, constant speed cooling or constant temperature, therefore the influence of the system dynamic characteristic of pure lag time constant τ is little, and the system heat of can setting up departments transmission scale-up factor is
Have
（3）
Quiescent value according to the temperature sensor of demarcating is found the solution, and draws temperature automatic checkout system temperature-time response characteristic curve map and sees Fig. 3, and horizontal ordinate is the response time
, unit is s, ordinate is response function in time
, unit ℃.
2) structure of No. 1 mercury thermometer of GB is made up of bulb,, glass capillary and graduated scale, simplifies the one order inertia system that has pure hysteresis, its transport function
In the formula,
Be the transport function of No. 1 mercury thermometer of GB,
Be scale-up factor,
Be time constant,
Be the retardation time of system.Equally, mercury thermometer is in the environment of constant speed intensification, constant speed cooling or constant temperature, and the influence of the system dynamic characteristic of pure lag time constant τ is little, can get
Choose two temperature of room temperature and boiling water and find the solution, draw GB No. 1 mercury thermometer temperature response curve figure such as Fig. 4, horizontal ordinate is the response time
, unit is s, ordinate is response function in time
, unit ℃.
Because temperature sensor Pt100 and No. 1 mercury thermometer of GB are demarcated at static constant temperature, have
=
=1.Utilize PC Tools language MATLAB, in conjunction with the time constant of three rank transport functions in Fig. 3 match solution formula (3), namely
,
,
, will
,
,
Substitution formula (4) obtains temperature automatic checkout system transport function
More than provide the result who carries out match according to third-order model, again Fig. 3 curve is carried out match by single order and second-order model respectively and contrasted.Fig. 5 is that Fig. 3 curve is respectively by first order modeling curve, second-order model and third-order model fitting result and the actual measured results comparison diagram of PC Tools language MATLAB.Horizontal ordinate is the response time among Fig. 5
, unit is s, ordinate is response function in time
, unit ℃.Fig. 6 is the enlarged drawing in O zone among Fig. 5.I is the first order modeling curve of PC Tools language MATLAB among the figure, and II is the second-order model curve of PC Tools language MATLAB, and III is the third-order model curve of PC Tools language MATLAB, IV actual measured results curve.Horizontal ordinate is the response time
, unit is s, ordinate is response function in time
, unit is ℃.Approach the approximation ratio ideal of liquid-filled thermometer temperature dynamic characteristic as can be seen from Figure 6 according to temperature automatic checkout system temperature dynamic characteristic in the third-order model fitting effect.
Utilize PC Tools language MATLAB, in conjunction with the time constant of transport function in Fig. 4 match solution formula (5)
, namely
Will
Substitution formula (5) obtains the transport function of No. 1 mercury thermometer of GB
3, for temperature automatic checkout system temperature characterisitic is approached into the liquid-filled thermometer temperature characterisitic, need to increase compensation tache, utilize the series connection of three first derivative elements and a first order inertial loop, determine penalty function, form computerese, realize penalty function mcu programming language, do small adjustment with time constant in the penalty function of computing machine implementation language MATLAB, l-G simulation test repeatedly, and then obtain better match and approach effect.
Approach into No. 1 mercury thermometer temperature characterisitic of GB for temperature automatic checkout system temperature characterisitic, need find penalty function
Make
Penalty function then
The bucking-out system frame as shown in Figure 7,
Temperature automatic checkout system time domain measurement temperature,
,
,
First derivative element time domain differentiation function,
Temperature sensor Pt100 compensation back time domain measurement temperature.Penalty function
Can regard the series connection of three first derivative elements and a first order inertial loop as, then the penalty function continued time domain differential equation has respectively
（15）；
（16）
In the formula,
Be temperature automatic checkout system time domain measurement temperature,
,
,
First derivative element time domain differentiation function,
Temperature automatic checkout system compensation back time domain measurement temperature.
In the compensation tache of computing machine implementation language MATLAB
,
,
,
Do small adjustment, l-G simulation test repeatedly, and then obtain better match and approach effect.
The response of temperature automatic checkout system, liquid-filled thermometer response are carried out dynamic compensation with the introducing penalty function to the temperature automatic checkout system, by the actual measurement temperature curve plotting contrast of automatic temperature monitoring system, namely get comparison diagram 8, V is compensation back temperature self-checking system actual measurement temperature curve, VI is No. 1 mercury thermometer temperature response curve of GB, and VII is temperature automatic checkout system temperature response curve.Transverse axis is represented heat time heating time
, unit is s, the longitudinal axis is represented corresponding temperature
, unit is ℃.
Temperature automatic checkout system dynamic characteristic V and the match of No. 1 mercury thermometer actual measurement profile of GB VI through over-compensation approaches as can be seen, also obtained in test checking.Temperature sensor transport function in metastable experimental situation for same model is constant, only need once test in robotization detecting instrument design process, can demarcate the detecting instrument parameter, and is convenient and easy.
Claims (3)
1. the compensation method that temperature detects automatically is characterized in that
A, employing constant temperature water bath heating make the temperature automatic checkout system heat up with constant rate of speed, carry out temperature detection;
B, utilize liquid-filled thermometer to demarcate the static nature value of temperature sensor;
The heat transfer characteristic of C, temperature sensor and liquid-filled thermometer adopts the transport function of determining the third-order system that three first-order systems are in series and the one order inertia system that has pure hysteresis separately respectively, find the solution by PC Tools language MATLAB analysis temperature response curve and experimental data match, determine time constant separately;
D, introducing compensation tache approach liquid-filled thermometer temperature dynamic characteristic with temperature automatic checkout system temperature dynamic characteristic, utilize the series connection of three first derivative elements and a first order inertial loop, determine penalty function; Time constant with the penalty function of computing machine implementation language MATLAB is done small adjustment, and repetition test is revised the parameter of penalty function, obtains better match and approaches effect.
2. temperature automatic checkout system, it is characterized in that this system is connected and composed by constant current source, temperature sensor, signal condition amplifier, A/D converter, single-chip microcomputer, computing machine, by single-chip microcomputer temperature sensor is carried out timing acquiring, and the data of gathering are carried out Nonlinear Processing, send to computing machine by serial line interface then.
3. temperature automatic checkout system according to claim 2, it is characterized in that described temperature sensor is by the platinum resistance thermometer sensor, silk, sheath, insulation framework, adiabatic fibrous asbestos and lead-in wire constitute, be positioned at coiling platinum resistance thermometer sensor, silk on the insulation framework of sheath, be connected with lead-in wire on the platinum resistance thermometer sensor, silk, between sheath and insulation framework, be filled with adiabatic fibrous asbestos.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592056A (en) * | 2013-11-25 | 2014-02-19 | 张金木 | Temperature calibration instrument based on temperature differences |
| CN104458060A (en) * | 2014-12-15 | 2015-03-25 | 南京化工职业技术学院 | Intelligent thermocouple calibration instrument |
| CN105094168A (en) * | 2014-05-23 | 2015-11-25 | 西卡西伯特博士及屈恩有限及两合公司 | Method and apparatus for controlling the temperature of a calibration volume of a device for comparative calibration of temperature sensors |
| CN105159138A (en) * | 2015-07-31 | 2015-12-16 | 中国电子科技集团公司第二十二研究所 | Radiometer temperature control system heat transfer mathematical model establishment method |
| CN105953946A (en) * | 2016-04-26 | 2016-09-21 | 哈尔滨工程大学 | Least squares algorithm based calibration method for temperature coefficient of fiber optic gyroscope temperature control device |
| CN106500857A (en) * | 2016-10-19 | 2017-03-15 | 广东盈科电子有限公司 | A kind of temperature sensor temperature-responsive lag compensation method |
| CN107764435A (en) * | 2017-10-12 | 2018-03-06 | 中国计量大学 | A kind of dynamic characteristic test method of temperature switch |
| CN109357781A (en) * | 2018-12-10 | 2019-02-19 | 中国航发南方工业有限公司 | Resistance and temperature signal conditioning circuit and electronic controller |
| CN109739082A (en) * | 2019-01-25 | 2019-05-10 | 广东电网有限责任公司 | A kind of lag observation method and device |
| CN111780892A (en) * | 2020-07-10 | 2020-10-16 | 中国计量科学研究院 | Calibration method and device of temperature detection equipment |
| CN113125032A (en) * | 2019-12-30 | 2021-07-16 | 联合汽车电子有限公司 | Response measurement system and measurement method of motor temperature monitoring system |
| CN114924602A (en) * | 2022-07-21 | 2022-08-19 | 广东海新智能厨房股份有限公司 | Electric heating system of integrated oven and control method |
| CN115359610A (en) * | 2022-07-04 | 2022-11-18 | 珠海派诺科技股份有限公司 | Temperature measurement type electrical fire monitoring method, equipment and storage medium |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592056A (en) * | 2013-11-25 | 2014-02-19 | 张金木 | Temperature calibration instrument based on temperature differences |
| CN105094168A (en) * | 2014-05-23 | 2015-11-25 | 西卡西伯特博士及屈恩有限及两合公司 | Method and apparatus for controlling the temperature of a calibration volume of a device for comparative calibration of temperature sensors |
| CN104458060A (en) * | 2014-12-15 | 2015-03-25 | 南京化工职业技术学院 | Intelligent thermocouple calibration instrument |
| CN105159138A (en) * | 2015-07-31 | 2015-12-16 | 中国电子科技集团公司第二十二研究所 | Radiometer temperature control system heat transfer mathematical model establishment method |
| CN105953946A (en) * | 2016-04-26 | 2016-09-21 | 哈尔滨工程大学 | Least squares algorithm based calibration method for temperature coefficient of fiber optic gyroscope temperature control device |
| CN106500857A (en) * | 2016-10-19 | 2017-03-15 | 广东盈科电子有限公司 | A kind of temperature sensor temperature-responsive lag compensation method |
| CN107764435A (en) * | 2017-10-12 | 2018-03-06 | 中国计量大学 | A kind of dynamic characteristic test method of temperature switch |
| CN109357781A (en) * | 2018-12-10 | 2019-02-19 | 中国航发南方工业有限公司 | Resistance and temperature signal conditioning circuit and electronic controller |
| CN109739082A (en) * | 2019-01-25 | 2019-05-10 | 广东电网有限责任公司 | A kind of lag observation method and device |
| CN113125032A (en) * | 2019-12-30 | 2021-07-16 | 联合汽车电子有限公司 | Response measurement system and measurement method of motor temperature monitoring system |
| CN111780892A (en) * | 2020-07-10 | 2020-10-16 | 中国计量科学研究院 | Calibration method and device of temperature detection equipment |
| CN111780892B (en) * | 2020-07-10 | 2021-11-30 | 中国计量科学研究院 | Calibration method of temperature detection equipment |
| CN115359610A (en) * | 2022-07-04 | 2022-11-18 | 珠海派诺科技股份有限公司 | Temperature measurement type electrical fire monitoring method, equipment and storage medium |
| CN114924602A (en) * | 2022-07-21 | 2022-08-19 | 广东海新智能厨房股份有限公司 | Electric heating system of integrated oven and control method |
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Application publication date: 20130807 |