CN104409001A - Thermocouple cold junction compensation demonstration instrument - Google Patents
Thermocouple cold junction compensation demonstration instrument Download PDFInfo
- Publication number
- CN104409001A CN104409001A CN201410762997.4A CN201410762997A CN104409001A CN 104409001 A CN104409001 A CN 104409001A CN 201410762997 A CN201410762997 A CN 201410762997A CN 104409001 A CN104409001 A CN 104409001A
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- CN
- China
- Prior art keywords
- cold junction
- triode thyristor
- bidirectional triode
- thermocouple
- thermopair
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
- G09B23/182—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for components
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/16—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for science of heat
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
- G09B23/187—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for measuring instruments
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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Algebra (AREA)
- Pure & Applied Mathematics (AREA)
- Educational Administration (AREA)
- Computational Mathematics (AREA)
- Business, Economics & Management (AREA)
- Educational Technology (AREA)
- Theoretical Computer Science (AREA)
- Control Of Temperature (AREA)
Abstract
The invention discloses a thermocouple cold junction compensation demonstration instrument and belongs to the field of automated instruments. The demonstration instrument is characterized by comprising a constant-temperature oil tank, a thermocouple, a constant-temperature water tank, a signal conditioning circuit, an A/D converter, a singlechip microcomputer system, a drive circuit, first bidirectional controllable silicon, second bidirectional controllable silicon, a first heating wire, a second heating wire and a thermal resistor. According to the demonstration instrument, the hot-end and cold-end temperatures of the thermocouple can be conveniently set and automatically controlled, the influence of the cold-end temperature on the thermocouple can be demonstrated, analyzed and calculated by digits and curves in real time, and students can intuitionally observe and compare cold junction compensation effects.
Description
Technical field
The present invention relates to a kind of instruments used for education of thermopair, particularly a kind of thermocouple cold junction compensation demonstrator.
Background technology
Thermopair is the temperature element be made up of two kinds of different metallic conductors, temperature transition is that electromotive force exports by it, due to the abstract indigestion of its principle of work, especially what will carry out cold junction compensation and is confused about, this content of courses that also result in this part becomes difficult point, does not also have this type of instruments used for education at present.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of energy to show the impact of cold junction temperature on thermoelectrical potential of thermopair visual in imagely, and how thermopair is carried out to the instruments used for education of cold junction compensation thermopair.
For achieving the above object, the present invention is realized by following technical scheme:
A kind of thermocouple cold junction compensation demonstrator, it is characterized in that, comprise thermostatic oil bath, thermopair, Water Tank with Temp.-controlled, signal conditioning circuit, A/D converter, Single Chip Microcomputer (SCM) system, driving circuit, first bidirectional triode thyristor, second bidirectional triode thyristor, first heater strip, second heater strip and thermal resistance, the hot junction of described thermopair is inserted in thermostatic oil bath, the cold junction of described thermopair and thermal resistance insert in Water Tank with Temp.-controlled, the cold junction of described thermopair is connected with signal conditioning circuit respectively with thermal resistance, described signal conditioning circuit, A/D converter, Single Chip Microcomputer (SCM) system and driving circuit are sequentially connected in series, the first described bidirectional triode thyristor is connected with driving circuit respectively with the second bidirectional triode thyristor, the first described bidirectional triode thyristor is connected with the first heater strip, the second described bidirectional triode thyristor is connected with the second heater strip.
Further, described Single Chip Microcomputer (SCM) system comprises LCD display, button and serial ports and exports, and its serial ports exports and can be connected with printer.
Further, described thermal resistance is copper resistance Cu100.
Further, the model of described signal conditioning circuit is TLC4502.
Further, the model of described A/D converter is ADC0809.
Further, the model of described driving circuit is MOC3061.
The invention has the beneficial effects as follows, provide a kind of hot junction and the cold junction temperature that can arrange easily and automatically control thermopair, numeral and curve can show that cold junction temperature is on the impact of thermoelectrical potential in real time, and how analysis and calculation is carried out to it, student can observe and contrast the effect of cold junction compensation intuitively, and the thermocouple cold junction upper limit of the present invention is 70 DEG C.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Implication is marked as follows in accompanying drawing:
1, thermostatic oil bath 2, thermopair 3, Water Tank with Temp.-controlled 4, signal conditioning circuit 5, A/D converter 6, Single Chip Microcomputer (SCM) system 7, driving circuit 8, first bidirectional triode thyristor 9, second bidirectional triode thyristor 10, first heater strip 11, second heater strip 12, thermal resistance.
Embodiment
Below in conjunction with diagram and specific embodiment, the present invention is described in further detail.
With reference to Fig. 1, a kind of thermocouple cold junction compensation demonstrator of the present invention, comprise thermostatic oil bath 1, thermopair 2, Water Tank with Temp.-controlled 3, signal conditioning circuit 4, A/D converter 5, Single Chip Microcomputer (SCM) system 6, driving circuit 7, first bidirectional triode thyristor 8, second bidirectional triode thyristor 9, first heater strip 10, second heater strip 11 and thermal resistance 12, the hot junction of described thermopair 2 is inserted in thermostatic oil bath 1, the cold junction of thermopair 2 and thermal resistance 12 insert in Water Tank with Temp.-controlled 3, the hot junction of described thermopair 2 is connected with signal conditioning circuit 4 respectively with thermal resistance 12, described signal conditioning circuit 4, A/D converter 5, Single Chip Microcomputer (SCM) system 6 and driving circuit 7 are sequentially connected in series, the first described bidirectional triode thyristor 8 is connected with driving circuit 7 respectively with the second bidirectional triode thyristor 9, the first described bidirectional triode thyristor 8 is connected with the first heater strip 10, the second described bidirectional triode thyristor 9 is connected with the second heater strip 11.
Further, described Single Chip Microcomputer (SCM) system 6 comprises LCD display, button and serial ports and exports, and its serial ports exports and can be connected with printer.
Further, described thermal resistance 12 is copper resistance Cu100.
Further, the model of described signal conditioning circuit 4 is TLC4502.
Further, the model of described A/D converter 5 is ADC0809.
Further, the model of described driving circuit 7 is MOC3061.
The temperature of thermostatic oil bath 1 is measured in thermopair 2 hot junction, thermal resistance 12 measures the temperature of Water Tank with Temp.-controlled 3, the temperature of Water Tank with Temp.-controlled 3 is the cold junction temperature of thermopair 2, the signal of thermopair 2 and thermal resistance 12 is via the amplification of signal conditioning circuit 4 and linearization, be converted to digital signal by A/D converter 5 again to deliver to Single Chip Microcomputer (SCM) system 6 and carry out analytical calculation, and show the temperature of thermostatic oil bath 1 and Water Tank with Temp.-controlled 3 and the thermoelectrical potential value of thermopair 2 output, Single Chip Microcomputer (SCM) system 6 is according to the temperature of the Water Tank with Temp.-controlled 3 arranged, the electrical heating power that the second bidirectional triode thyristor 9 changes the second heater strip 11 is controlled by controlling driving circuit 7, thus control the temperature of Water Tank with Temp.-controlled 3, Water Tank with Temp.-controlled 3, thermal resistance 12, signal conditioning circuit 4, A/D converter 5, Single Chip Microcomputer (SCM) system 6, driving circuit 7, second bidirectional triode thyristor 9 and the second heater strip 11 constitute the Cryocooler Temperature Closed Loop Control System of Water Tank with Temp.-controlled 3, same Single Chip Microcomputer (SCM) system 6 is according to the temperature of the thermostatic oil bath 1 arranged, the electrical heating power that the first bidirectional triode thyristor 8 changes the first heater strip 10 is controlled by controlling driving circuit 7, thus control the temperature of thermostatic oil bath 1, thermostatic oil bath 1, signal conditioning circuit 4, A/D converter 5, Single Chip Microcomputer (SCM) system 6, driving circuit 7, first bidirectional triode thyristor 8 and the first heater strip 10 constitute the Cryocooler Temperature Closed Loop Control System of thermostatic oil bath 1, data in demonstration, as the temperature of thermostatic oil bath 1 and Water Tank with Temp.-controlled 3, the thermoelectrical potential that thermopair exports, electromotive forces corresponding to cold junction temperature etc. can be printed by printer.The present invention can arrange and control hot junction and the cold junction temperature of thermopair easily, fully illustrates the impact of cold junction temperature on thermoelectrical potential, and how to carry out analysis and calculation to it, and the thermocouple cold junction upper limit of the present invention is 70 DEG C.
Claims (2)
1. a thermocouple cold junction compensation demonstrator, is characterized in that: comprise thermostatic oil bath (1), thermopair (2), Water Tank with Temp.-controlled (3), signal conditioning circuit (4), A/D converter (5), Single Chip Microcomputer (SCM) system (6), driving circuit (7), first bidirectional triode thyristor (8), second bidirectional triode thyristor (9), first heater strip (10), second heater strip (11) and thermal resistance (12), the hot junction of described thermopair (2) is inserted in thermostatic oil bath (1), the cold junction of described thermopair (2) and thermal resistance (12) insert in Water Tank with Temp.-controlled (3), the hot junction of described thermopair (2) is connected with signal conditioning circuit (4) respectively with thermal resistance (12), described signal conditioning circuit (4), A/D converter (5), Single Chip Microcomputer (SCM) system (6) and driving circuit (7) are sequentially connected in series, described the first bidirectional triode thyristor (8) is connected with driving circuit (7) respectively with the second bidirectional triode thyristor (9), described the first bidirectional triode thyristor (8) is connected with the first heater strip (10), and described the second bidirectional triode thyristor (9) is connected with the second heater strip (11).
2. a kind of thermocouple cold junction compensation demonstrator according to claim 1, is characterized in that: described thermal resistance 12 is copper resistance Cu100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410762997.4A CN104409001A (en) | 2014-12-15 | 2014-12-15 | Thermocouple cold junction compensation demonstration instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410762997.4A CN104409001A (en) | 2014-12-15 | 2014-12-15 | Thermocouple cold junction compensation demonstration instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104409001A true CN104409001A (en) | 2015-03-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410762997.4A Pending CN104409001A (en) | 2014-12-15 | 2014-12-15 | Thermocouple cold junction compensation demonstration instrument |
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| CN (1) | CN104409001A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107421651A (en) * | 2017-04-20 | 2017-12-01 | 安徽春辉仪表线缆集团有限公司 | A kind of controllable thermocouple structure of cold end constant temperature |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1481842A1 (en) * | 1987-07-12 | 1989-05-23 | Военный Инженерный Краснознаменный Институт Им.А.Ф.Можайского | Learning aid on materiology |
| CN103050038A (en) * | 2012-12-20 | 2013-04-17 | 盐城师范学院 | Nickel series thermocouple characteristic demonstration instrument |
| CN103077645A (en) * | 2012-12-20 | 2013-05-01 | 盐城师范学院 | Platinum-rhodium series thermocouple characteristic demonstration instrument |
| CN103093673A (en) * | 2012-12-20 | 2013-05-08 | 盐城师范学院 | Non-standardized thermocouple character demonstration instrument |
| CN103385700A (en) * | 2013-08-02 | 2013-11-13 | 王卫东 | High-precision rapid self-calibration wireless electronic thermometer |
| CN204270574U (en) * | 2014-12-15 | 2015-04-15 | 南京化工职业技术学院 | A kind of thermocouple cold junction compensation demonstrator |
-
2014
- 2014-12-15 CN CN201410762997.4A patent/CN104409001A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1481842A1 (en) * | 1987-07-12 | 1989-05-23 | Военный Инженерный Краснознаменный Институт Им.А.Ф.Можайского | Learning aid on materiology |
| CN103050038A (en) * | 2012-12-20 | 2013-04-17 | 盐城师范学院 | Nickel series thermocouple characteristic demonstration instrument |
| CN103077645A (en) * | 2012-12-20 | 2013-05-01 | 盐城师范学院 | Platinum-rhodium series thermocouple characteristic demonstration instrument |
| CN103093673A (en) * | 2012-12-20 | 2013-05-08 | 盐城师范学院 | Non-standardized thermocouple character demonstration instrument |
| CN103385700A (en) * | 2013-08-02 | 2013-11-13 | 王卫东 | High-precision rapid self-calibration wireless electronic thermometer |
| CN204270574U (en) * | 2014-12-15 | 2015-04-15 | 南京化工职业技术学院 | A kind of thermocouple cold junction compensation demonstrator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107421651A (en) * | 2017-04-20 | 2017-12-01 | 安徽春辉仪表线缆集团有限公司 | A kind of controllable thermocouple structure of cold end constant temperature |
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Application publication date: 20150311 |
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