CN108801488A - A kind of thermocouple temperature measurement cold junction compensation system - Google Patents
A kind of thermocouple temperature measurement cold junction compensation system Download PDFInfo
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- CN108801488A CN108801488A CN201810322860.5A CN201810322860A CN108801488A CN 108801488 A CN108801488 A CN 108801488A CN 201810322860 A CN201810322860 A CN 201810322860A CN 108801488 A CN108801488 A CN 108801488A
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- cabin
- plug
- crossing
- thermocouple
- sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
- G01K7/10—Arrangements for compensating for auxiliary variables, e.g. length of lead
- G01K7/12—Arrangements with respect to the cold junction, e.g. preventing influence of temperature of surrounding air
Abstract
The present invention relates to a kind of thermocouple temperature measurement cold junction compensation systems, it is tested for low pressure cabin thermal characteristics, including copper conductor, crossing cabin plug, platinum sensor, silica gel, thermocouple, heater, the crossing cabin connector is divided into crossing cabin plug cabin inside points and crossing cabin plug part out of my cabin by low pressure cabin shell, copper lead is welded on crossing cabin plug out of my cabin on the pad of part, thermocouple and platinum sensor are welded on the pad of crossing cabin plug cabin inside points, testpieces is placed in low pressure cabin, K-type thermocouple sensor is installed on the testpieces, the K-type thermocouple sensor is connect with thermocouple, copper conductor is connect with the collecting device of low pressure out of my cabin.The production method of the hot spot weeding hoe thermometric cold junction compensation system includes the following steps：Goods and materials prepare, welding, check break-make, encapsulation, installation.The present invention is used as cold junction compensation by welding platinum sensor on crossing cabin plug, and compensation program inverse testpieces measuring point temperature value is write on collecting device.Compared with mixture of ice and water cold junction compensation in the prior art, temperature measurement accuracy and accuracy greatly improve.
Description
Technical field
The present invention relates to a kind of thermocouple temperature measurement cold junction compensation systems, and it is suitable for the experiments of low pressure cabin thermal characteristics.
Background technology
For aircraft in high-altitude low pressure high speed flight, surface will produce Aerodynamic Heating.In order to really verify structure
Heat-transfer character and thermal matching energy need to carry out the heat test under low pressure.The radiant heatings means such as generally use quartz lamp are applied
Heating load, using K-type thermocouple sensor measurement temperature parameter.The temperature-measurement principle of thermocouple sensor is：Two kinds of different materials
The conductor a of material, b form a closed circuit, as shown in Figure 1, when node 1 and 2 experience temperature difference when, generate in the loop with
The corresponding electromotive force of two node temperature difference sizes is different, sensor, referred to as thermocouple made of this pyroelectric effect using conductor,
1 is cold end in Fig. 1, and 2 be hot junction (working end).Since low pressure cabin is closed structure, K-type thermocouple sensor passes through low pressure
Crossing cabin plug on cabin is drawn out of my cabin, and acquisition system is accessed.This relates to the problem of cold junction compensation.General crossing cabin is inserted
The pad (material is copper) at head both ends welds common copper conductor, and the K-type thermocouple sensor in cabin is led with what crossing cabin plug welded
Line is connected, and junction is the cold end of thermocouple, and cold end is concentrated into mixture of ice and water (0 DEG C) and is used as cold junction compensation.
But since under low pressure, mixture of ice and water highly volatile be easy to cause the pollution of testpieces and the humidity short circuit of instrument and meter；Together
When prolonged low pressure heat test be easy to cause ice-out, it is 0 DEG C to cause cold junction temperature not, causes thermometric inaccurate.
Invention content
(1) technical problems to be solved
Deficiency in for the above-mentioned prior art, the present invention propose a kind of thermocouple temperature measurement cold junction compensation system, use
It is tested in low pressure cabin thermal characteristics.Due to the particular form of thermometric in low pressure cabin, previous Method of Cold Terminal Compensation cannot be used
It compensates, and platinum sensor is used to carry out cold junction compensation.The crossing cabin plug cabin inside points in low pressure cabin weld K-type thermoelectricity
It is even, common copper conductor is partly welded out of my cabin, and cold end at this moment is in crossing cabin plug cabin at pad.Platinum sensor is welded on
Aviation plug cabin inside points carry out real-time compensation by collecting temperature to cold end, and the temperature improved in low pressure cabin measures essence
Degree.
(2) technical solution
A kind of thermocouple temperature measurement cold junction compensation system is tested for low pressure cabin thermal characteristics, including copper conductor, crossing cabin are inserted
Head, platinum sensor, silica gel, thermocouple, heater, the crossing cabin connector are divided into crossing cabin plug cabin by low pressure cabin shell
Inside points and crossing cabin plug part out of my cabin, copper lead are welded on crossing cabin plug out of my cabin on the pad of part, thermocouple and platinum resistance
Sensor is welded on the pad of crossing cabin plug cabin inside points, the weld of silica gel packaging crossing cabin plug cabin inside points, described
Heater is made of reflecting plate and quartz lamp, and testpieces is placed in low pressure cabin, and installation K-type thermocouple senses on the testpieces
Device, the K-type thermocouple sensor are connect with thermocouple, and copper conductor is connect with the collecting device of low pressure out of my cabin, the acquisition
Equipment can write acquisition and cold junction compensation program, moreover it is possible to the temperature of corresponding measuring point on real-time display testpieces.
The needle of the crossing cabin plug is copper needle.
The material of the K-type thermocouple sensor 2 is nickel chromium triangle-nisiloy.
A kind of production method of thermocouple temperature measurement cold junction compensation system comprising following steps：
Step 1, goods and materials prepare：Prepare 1 crossing cabin plug and 1 platinum sensor, each crossing cabin plug is equipped with n roots K
Type thermocouple sensor and M/2 root copper conductors, confirm that each element state is good；The needle number of the crossing cabin plug is M, the platinum electricity
The line end number for hindering sensor is m, M=n × 2+m；
Step 2, welding：N × 2 piece the needle of crossing cabin plug cabin inside points welds n root K-type thermocouple sensors, the welding of m root needles
Platinum sensor, crossing cabin plug out of my cabin part M root needles weld M/2 root twin-core copper conductors；
Step 3 checks break-make：Crossing cabin plug cabin inside points and crossing cabin plug are partly connected out of my cabin, using multimeter by
One checks the break-make of the M root needles of crossing cabin plug；If there is open circuit, check whether welding rosin joint occurs, it is ensured that access is normal；
Step 4, encapsulation：Crossing cabin plug cabin inside points are disposed vertically fixation, using silica gel packaging to its welding portion into
Row encapsulation；
Step 5, installation：This crossing cabin plug cabin inside points is mounted on the shell of low pressure cabin.
The crossing cabin plug is 54 pin types, and the K-type thermocouple sensor length is 10m；The copper conductor is double-core type,
Length is 15m, and the line end number of the platinum sensor is 4.
The silica gel is 704 silica gel, squeezes out 5ml silica gel every time, 24 hours is stood, repeatedly, until crossing cabin plug cabin
Until being filled in inside points, this packaged crossing cabin plug cabin inside points is then stood 7 days, to ensure silica gel spontaneous curing.
(3) advantageous effect
A kind of thermocouple temperature measurement cold junction compensation system of the present invention provides thermocouple cold junction in a kind of new low pressure cabin
Compensation method is used as cold junction compensation by welding platinum sensor on crossing cabin plug, compensation journey is write on collecting device
Sequence inverse testpieces measuring point temperature value.Compared with mixture of ice and water cold junction compensation in the prior art, temperature measurement accuracy and accurate
Property greatly improves.
Description of the drawings
Fig. 1 thermocouple principle figures.
Fig. 2 platinum sensor schematic diagrames.
Fig. 3 crossing cabin plug schematic diagrames.
Fig. 4 thermocouple temperature measurement cold junction compensation system schematics.
Specific implementation mode
A kind of thermocouple temperature measurement cold junction compensation system is tested for low pressure cabin thermal characteristics, including copper conductor 10, crossing cabin are inserted
Head, platinum sensor 7, silica gel 6, thermocouple 5, heater, the crossing cabin connector are divided into crossing cabin by low pressure cabin shell 11
Plug cabin inside points 8 and crossing cabin plug part 9 out of my cabin, copper lead 10 are welded on crossing cabin plug out of my cabin on the pad of part 9, thermoelectricity
Idol 5 and platinum sensor 7 are welded on the pad of crossing cabin plug cabin inside points 8, and silica gel 6 encapsulates crossing cabin plug cabin inside points
8 weld, the heater are made of reflecting plate 3 and quartz lamp 4, and testpieces 1, the testpieces 1 are placed in low pressure cabin
Upper installation K-type electroheat pair sensor 2, the K-type electroheat pair sensor 2 are connect with thermocouple 5, and copper conductor 10 and low pressure are out of my cabin
Collecting device connection, the collecting device can write acquisition and cold junction compensation program, moreover it is possible to corresponding on real-time display testpieces 1
The temperature of measuring point.
The needle of the crossing cabin plug is copper needle.
The material of the K-type thermocouple sensor 2 is nickel chromium triangle-nisiloy.
The setting of silica gel 6 may insure the fixing of solder joint, prevent solder joint from falling off, and be also used as protective layer, reduce platinum
7 temperature fluctuation of electric resistance sensor is too fast.The thermoelectrical potential value of cold junction temperature value and testpieces temperature point is measured by collecting device.
Two thermoelectrical potential values are added at thermoelectrical potential, table look-up and obtain temperature value, as try by cold junction temperature value inverse in capture program
Test the temperature value of part corresponding measuring point.
A kind of production method of thermocouple temperature measurement cold junction compensation system comprising following steps：
1, goods and materials prepare：Prepare 1 crossing cabin plug and 1 platinum sensor 7, each crossing cabin plug is equipped with n roots K-type heat
Thermocouple sensor 2 and M/2 roots copper conductor 10, confirm that each element state is good；The needle number of the crossing cabin plug is M, the platinum electricity
The line end number for hindering sensor 7 is m, M=n × 2+m.
The crossing cabin plug is 54 pin types, and 2 length of K-type thermocouple sensor is 10m；The copper conductor 10 is twin-core
Formula, length 15m.The line end number of the platinum sensor 7 is 4.
2, it welds：N × 2 piece needle welding n root K-types the thermocouple sensor 2 of crossing cabin plug cabin inside points 8, m root needles weld platinum
Electric resistance sensor 7, the M root needles welding M/2 root twin-cores copper conductor 10 of crossing cabin plug part 9 out of my cabin.
3, break-make is checked：By crossing cabin plug cabin inside points 8 and crossing cabin plug, part 9 connects out of my cabin, one by one using multimeter
Check the break-make of M root needles；If there is open circuit, check whether welding rosin joint occurs, it is ensured that access is normal.
4, it encapsulates：Crossing cabin plug cabin inside points 8 are disposed vertically fixation, its welding portion is carried out using the encapsulation of silica gel 6
Encapsulation.
The silica gel 6 is 704 silica gel, takes and squeezes out 5ml silica gel 6 every time, 24 hours is stood, repeatedly, until crossing cabin
Until being filled in plug cabin inside points 8, this packaged crossing cabin plug cabin inside points 8 is then stood 7 days, to ensure silica gel certainly
So solidification.
5, it installs：This crossing cabin plug cabin inside points 8 is mounted on low pressure cabin shell 11.
A kind of use process of thermocouple temperature measurement cold junction compensation system of the present invention is：With reference to Fig. 4, by testpieces 1 low
It fixes and installs in pressure chamber.Hypothesis test part temperature point is 25, using bonding (nonmetallic materials) or welding (gold
Belong to material) method on testpieces corresponding measuring point position install 25 K-type thermocouple sensors 2, by thermocouple sensor with wear
The thermocouple 5 of cabin plug cabin inside points 8 connects, and 9 corresponding copper conductor 10 of part is connected crossing cabin plug with collecting device out of my cabin,
Collecting device acquires the thermoelectrical potential signal value and cold junction temperature value of testpieces temperature point.In capture program, by cold junction temperature
Value finds the thermoelectrical potential value under corresponding temperature by lookup table mode, this value is added separately to the thermoelectrical potential of testpieces temperature point
Value, compensates thermocouple cold junction, by tabling look-up, this total thermoelectrical potential is converted into temperature, as testpieces is accordingly surveyed
The temperature value of point.
Claims (6)
1. a kind of thermocouple temperature measurement cold junction compensation system is tested, which is characterized in that led including copper for low pressure cabin thermal characteristics
Line, crossing cabin plug, platinum sensor, silica gel, thermocouple, heater, the crossing cabin connector are divided by low pressure cabin shell
Crossing cabin plug cabin inside points and crossing cabin plug part out of my cabin, copper lead are welded on crossing cabin plug out of my cabin on the pad of part, thermoelectricity
Even summation platinum sensor is welded on the pad of crossing cabin plug cabin inside points, the weldering of silica gel packaging crossing cabin plug cabin inside points
Place is met, the heater is made of reflecting plate and quartz lamp, and testpieces is placed in low pressure cabin, K-type is installed on the testpieces
Thermocouple sensor, the K-type thermocouple sensor are connect with thermocouple, and copper conductor connects with the collecting device of low pressure out of my cabin
It connects, the collecting device can write acquisition and cold junction compensation program, moreover it is possible to the temperature of corresponding measuring point on real-time display testpieces.
2. a kind of thermocouple temperature measurement cold junction compensation system as described in claim 1, which is characterized in that the needle of the crossing cabin plug
For copper needle.
3. a kind of thermocouple temperature measurement cold junction compensation system as described in claim 1, which is characterized in that the K-type thermocouple passes
The material of sensor is nickel chromium triangle-nisiloy.
4. a kind of production method of any thermocouple temperature measurement cold junction compensation system of claims 1 to 3, which is characterized in that
It includes the following steps：
Step 1, goods and materials prepare：Prepare 1 crossing cabin plug and 1 platinum sensor, each crossing cabin plug is equipped with n roots K-type heat
Thermocouple sensor and M/2 root copper conductors, confirm that each element state is good；The needle number of the crossing cabin plug is M, and the platinum resistance passes
The line end number of sensor is m, M=n × 2+m；
Step 2, welding：N × 2 piece the needle of crossing cabin plug cabin inside points welds n root K-type thermocouple sensors, and m root needles weld platinum electricity
Hinder sensor, crossing cabin plug out of my cabin part M root needles weld M/2 root twin-core copper conductors；
Step 3 checks break-make：Crossing cabin plug cabin inside points and crossing cabin plug are partly connected out of my cabin, examined one by one using multimeter
Look into the break-make of the M root needles of crossing cabin plug；If there is open circuit, check whether welding rosin joint occurs, it is ensured that access is normal；
Step 4, encapsulation：Crossing cabin plug cabin inside points are disposed vertically fixation, its welding portion is sealed using silica gel packaging
Dress；
Step 5, installation：This crossing cabin plug cabin inside points is mounted on the shell of low pressure cabin.
5. a kind of production method as claimed in claim 4, it is characterised in that：The crossing cabin plug is 54 pin types, the K-type heat
Thermocouple sensor length is 10m；The copper conductor is double-core type, and the line end number of length 15m, the platinum sensor are 4.
6. a kind of production method as claimed in claim 4, which is characterized in that the silica gel is 704 silica gel, squeezes out 5ml every time
Silica gel stands 24 hours, repeatedly, until being filled in the inside points of crossing cabin plug cabin, then by this packaged crossing cabin
Plug cabin inside points stand 7 days, to ensure silica gel spontaneous curing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810322860.5A CN108801488A (en) | 2018-04-11 | 2018-04-11 | A kind of thermocouple temperature measurement cold junction compensation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810322860.5A CN108801488A (en) | 2018-04-11 | 2018-04-11 | A kind of thermocouple temperature measurement cold junction compensation system |
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| CN108801488A true CN108801488A (en) | 2018-11-13 |
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| CN201810322860.5A Pending CN108801488A (en) | 2018-04-11 | 2018-04-11 | A kind of thermocouple temperature measurement cold junction compensation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112577621A (en) * | 2020-12-28 | 2021-03-30 | 中国航天空气动力技术研究院 | Coaxial thermocouple cold junction temperature measuring device and system |
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| CN102798481A (en) * | 2012-08-22 | 2012-11-28 | 哈尔滨汽轮机厂有限责任公司 | Cold junction compensation temperature measurement method of thermocouple |
| CN105651409A (en) * | 2016-04-06 | 2016-06-08 | 中国南方航空工业(集团)有限公司 | Thermocouple cold junction compensation and temperature measurement circuit and device |
| WO2017029080A1 (en) * | 2015-08-20 | 2017-02-23 | Endress+Hauser Wetzer Gmbh+Co. Kg | Temperature measuring device with comparison temperature determination |
| CN106608377A (en) * | 2015-10-22 | 2017-05-03 | 北京卫星环境工程研究所 | Data collection system for vacuum low-temperature environment |
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2018
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Patent Citations (4)
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| CN102798481A (en) * | 2012-08-22 | 2012-11-28 | 哈尔滨汽轮机厂有限责任公司 | Cold junction compensation temperature measurement method of thermocouple |
| WO2017029080A1 (en) * | 2015-08-20 | 2017-02-23 | Endress+Hauser Wetzer Gmbh+Co. Kg | Temperature measuring device with comparison temperature determination |
| CN106608377A (en) * | 2015-10-22 | 2017-05-03 | 北京卫星环境工程研究所 | Data collection system for vacuum low-temperature environment |
| CN105651409A (en) * | 2016-04-06 | 2016-06-08 | 中国南方航空工业(集团)有限公司 | Thermocouple cold junction compensation and temperature measurement circuit and device |
Non-Patent Citations (3)
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| 何超 等: "低气压温控设备的舱内环境温度影响因素分析", 《航天器环境工程》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112577621A (en) * | 2020-12-28 | 2021-03-30 | 中国航天空气动力技术研究院 | Coaxial thermocouple cold junction temperature measuring device and system |
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Application publication date: 20181113 |