JPH09152379A - Temperature measuring apparatus employing thermocouple - Google Patents
Temperature measuring apparatus employing thermocoupleInfo
- Publication number
- JPH09152379A JPH09152379A JP31235195A JP31235195A JPH09152379A JP H09152379 A JPH09152379 A JP H09152379A JP 31235195 A JP31235195 A JP 31235195A JP 31235195 A JP31235195 A JP 31235195A JP H09152379 A JPH09152379 A JP H09152379A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- thermocouple
- temperature measuring
- thermocouples
- absolute
- 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.)
- Pending
Links
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、２点の温度とその
温度差を同時に計測する熱電対を用いた温度計測装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature measuring device using a thermocouple for simultaneously measuring temperatures at two points and a temperature difference between them.
【０００２】[0002]
【従来の技術】従来の熱電対により行われる２点の温度
とその差温の計測は、図２及び図３に示すように行われ
ていた。2. Description of the Related Art A conventional thermocouple has been used to measure the temperature at two points and the temperature difference between them, as shown in FIGS.
【０００３】図２に示す場合は、それぞれ測温接点１
ａ，２ａを持つ２本の熱電対１，２の信号を温度計測器
３ａが入力し、同計測器３ａにより個々に絶対温度Ｔ1
及びＴ 2 を計測し、このときの差温は絶対温度Ｔ1 ，Ｔ
2 の差Ｔ1 −Ｔ2 より求めていた。In the case shown in FIG. 2, each of the temperature measuring contacts 1
a and 2a having two thermocouples 1 and 2 have a temperature measuring device.
3a inputs and the absolute temperature T is individually measured by the measuring instrument 3a.1
And T TwoIs measured and the temperature difference at this time is the absolute temperature T1, T
TwoDifference T1-TTwoI wanted more.
【０００４】図３に示す場合は、それぞれ測温接点１
ａ，２ａを持つ２本の熱電対１，２をそれぞれの極性を
反対として直列接続し、その合成信号を温度計測器３ｂ
が入力する差温計測法により直接差温Ｔ1 −Ｔ2 を計測
し、このときの絶対温度Ｔ1 （またはＴ2 ）は、上記と
は別の測温接点６ａを持つ熱電対６の信号を温度計測器
３ｂが入力し、同計測器３ｂにより絶対温度Ｔ’（Ｔ1
＝Ｔ’又はＴ2 ＝Ｔ’）を計測していた。In the case shown in FIG. 3, each of the temperature measuring contacts 1
Two thermocouples 1 and 2 having a and 2a are connected in series with their polarities being opposite to each other, and the combined signal thereof is measured by the temperature measuring device 3b.
The differential temperature T 1 -T 2 is directly measured by the differential temperature measuring method input by the. The absolute temperature T 1 (or T 2 ) at this time is the signal of the thermocouple 6 having the temperature measuring contact 6a different from the above. Is input to the temperature measuring instrument 3b, and the absolute temperature T '(T 1
= T 'or T 2 = T') was measured.
【０００５】[0005]
【発明が解決しようとする課題】従来の温度計測におい
ては、以下の課題があった。即ち、図２に示す場合は、
絶対温度Ｔ1 及びＴ2 を個々に計測しているため、Ｔ1
及びＴ2 がそれぞれ千数百度、Ｔ1 −Ｔ2 が数十度のよ
うな温度の場合、計測精度上の課題があった。The conventional temperature measurement has the following problems. That is, in the case shown in FIG.
Since absolute temperatures T 1 and T 2 are individually measured, T 1
When T and T 2 are each several thousand and several hundred degrees and T 1 -T 2 is several tens of degrees, there is a problem in measurement accuracy.
【０００６】これを具体的に説明すると、Ｔ1 及びＴ2
の計測誤差を最大±ΔＴとすると、その差温Ｔ1 −Ｔ2
には最大２ΔＴの計測誤差を生じる。このことは、例え
ばＴ 1 ＝１４００℃、Ｔ2 ＝１３８０℃の計測を行い、
ΔＴ＝１０℃のような場合、差温Ｔ1 −Ｔ2 ＝２０℃に
対して、±２ΔＴ＝±２０℃の計測誤差を有しているこ
とになり、２０℃を差温とすることができない。[0006] To explain this concretely, T1And TTwo
If the maximum measurement error is ± ΔT, the difference temperature T1-TTwo
Causes a maximum measurement error of 2ΔT. This is
T 1= 1400 ° C, TTwo= 1380 ℃ measurement,
In case of ΔT = 10 ° C, the temperature difference T1-TTwo= 20 ℃
On the other hand, it must have a measurement error of ± 2ΔT = ± 20 ° C.
Therefore, the temperature difference cannot be 20 ° C.
【０００７】図３に示す場合は、差温は、２本の熱電対
の差温計測法により直接Ｔ1 −Ｔ2を計測するものであ
り、計測誤差は図２に示す場合の±２ΔＴに対して半分
以下の±ΔＴ以下となり、計測精度の向上が見込まれ
る。In the case shown in FIG. 3, T 1 -T 2 is directly measured by the temperature difference measuring method of two thermocouples, and the measurement error is ± 2ΔT in the case shown in FIG. On the other hand, it is less than ± ΔT, which is less than half, and improvement in measurement accuracy is expected.
【０００８】しかし、絶対温度計測のため専用の熱電対
が必要であり、さらにこの熱電対の測温接点は、差温計
測の熱電対の測温接点Ｔ1 （またはＴ2 ）と同一箇所
に、しかもＴ’＝Ｔ1 （またはＴ’＝Ｔ2 ）となるよう
に装備する必要があった。本発明は上記の課題を解決し
ようとするものである。However, a dedicated thermocouple is required for absolute temperature measurement, and the temperature measuring contact of this thermocouple is located at the same position as the temperature measuring contact T 1 (or T 2 ) of the thermocouple for measuring the differential temperature. Moreover, it was necessary to equip it so that T '= T 1 (or T' = T 2 ). The present invention seeks to solve the above problems.
【０００９】[0009]
【課題を解決するための手段】請求項１に記載の発明に
係る熱電対を用いた温度計測装置は、それぞれの測温接
点が異なる温度測定部位に配設される一方と他方の熱電
対、および同一方と他方の熱電対が接続された温度計測
器を備え、同温度計測器には、上記一方の熱電対に接続
された絶対温度計測用アンプと、上記一方と他方の熱電
対が互いに極性を反対として接続されて形成された直列
接続回路に接続された差温計測用アンプが設けられたこ
とを特徴としている。According to a first aspect of the present invention, there is provided a temperature measuring device using a thermocouple, wherein one temperature measuring contact is provided at a different temperature measuring portion and the other thermocouple is provided. And a thermometer to which the same and the other thermocouple are connected, and the thermometer includes an absolute temperature measuring amplifier connected to the one thermocouple and the one and the other thermocouple to each other. It is characterized in that a differential temperature measuring amplifier connected to a series connection circuit formed by connecting with opposite polarities is provided.
【００１０】上記において、一方の熱電対が出力した電
圧信号は温度計測器の絶対温度計測用アンプに入力さ
れ、一方の熱電対の測温接点近傍の絶対温度が計測され
る。また、一方の熱電対が出力した電圧信号は、他方の
熱電対が出力した電圧信号が減算されて差温計測用アン
プに入力され、一方と他方の熱電対の測温接点近傍の絶
対温度の差温が計測される。In the above, the voltage signal output from one thermocouple is input to the absolute temperature measuring amplifier of the temperature measuring instrument, and the absolute temperature near the temperature measuring contact of one thermocouple is measured. In addition, the voltage signal output from one thermocouple is subtracted from the voltage signal output from the other thermocouple and is input to the differential temperature measurement amplifier, and the absolute temperature near the temperature measurement junction of one and the other thermocouple is The temperature difference is measured.
【００１１】上記絶対温度計測用と差温計測用のアンプ
は、いずれも高入力インピーダンスアンプのため、いず
れの場合にもアンプにより生じる計測誤差は少なく高精
度の温度計測が可能である。Since the absolute temperature measuring amplifier and the differential temperature measuring amplifier are both high input impedance amplifiers, in any case, the measurement error caused by the amplifier is small and highly accurate temperature measurement is possible.
【００１２】そのため、熱電対を２本使用するだけで特
定部位の絶対温度と特定部位間の差温を同時に計測する
ことが可能になるとともに、これらの温度を、特に温度
差の少ない絶対温度の差温について、高精度で計測する
ことが可能となる。Therefore, it becomes possible to simultaneously measure the absolute temperature of a specific part and the temperature difference between the specific parts by using only two thermocouples, and to measure these temperatures, especially the absolute temperature with a small temperature difference. It becomes possible to measure the differential temperature with high accuracy.
【００１３】[0013]
【発明の実施の形態】本発明の実施の一形態に係る温度
計測装置を図１により説明する。図１に示す本実施形態
の装置は、それぞれの測温接点１ａ，２ａが異なる温度
測定部位に配設されるＪＩＳ−Ｃ−１６０２ タイプＲ
（白金−白金ロジウム熱電対）の２本の熱電対１，２、
および同熱電対１，２が接続された温度計測器３を備
え、同温度計測器３には、上記熱電対１に接続され熱電
対１により計測された絶対温度Ｔ 1 に対応する電圧信号
を出力する絶対温度計測用のアンプ４と、上記熱電対１
と−極同士が接続された熱電対２の＋極と熱電対１の＋
極の間に接続され熱電対１，２により計測された差温Ｔ
1 −Ｔ2 に対応する電圧信号を出力する差温計測用のア
ンプ５が設けられている。BEST MODE FOR CARRYING OUT THE INVENTION Temperature according to an embodiment of the present invention
The measuring device will be described with reference to FIG. This embodiment shown in FIG.
The device has a different temperature at each of the temperature measuring contacts 1a and 2a.
JIS-C-1602 type R installed at the measurement site
(Platinum-platinum rhodium thermocouple) two thermocouples 1, 2,
And a temperature measuring instrument 3 to which the thermocouples 1 and 2 are connected
The thermometer 3 is connected to the thermocouple 1 and the thermoelectric
Absolute temperature T measured by pair 1 1Voltage signal corresponding to
Absolute temperature measurement amplifier 4 for outputting
+ Of the thermocouple 2 and + of the thermocouple 1 in which the and-poles are connected
Temperature difference T measured between thermocouples 1 and 2 connected between the poles
1-TTwoFor differential temperature measurement that outputs a voltage signal corresponding to
Pump 5 is provided.
【００１４】なお、上記絶対温度計測用及び差温計測用
のアンプ４，５の信号処理概要は以下のとおりである。 アンプ 入力信号電圧 ゲイン 出力電圧 絶対温度計測用 -0.4mV 〜20.2mV ４９５倍 ０〜１０．２Ｖ 差温計測用 -8.3mV 〜 8.7mV ６００倍 ０〜１０．２Ｖ 上記において、熱電対１の測温接点１ａの温度Ｔ1 に対
応した電圧信号は、温度計測器３内のアンプ４に入力さ
れ、ここで増幅されて絶対温度Ｔ1 に比例した電圧信号
を出力し、絶対温度Ｔ1 の温度表示が行われる。また、
上記熱電対１の電圧信号は、熱電対２の測温接点２ａの
温度Ｔ2 に対応した電圧信号が温度計測装置３内にて減
算されてアンプ４に入力され、ここで増幅されて差温Ｔ
1 −Ｔ2に比例した電圧出力が得られ、差温Ｔ1 −Ｔ2
の温度表示が行われる。The outline of the signal processing of the amplifiers 4 and 5 for absolute temperature measurement and differential temperature measurement is as follows. Amplifier Input signal voltage Gain output voltage For absolute temperature measurement -0.4mV ~ 20.2mV 495 times 0 ~ 10.2V For differential temperature measurement -8.3mV ~ 8.7mV 600 times 0 ~ 10.2V In the above, thermocouple 1 temperature measurement voltage signal corresponding to the temperature T 1 of the contact 1a is input to the amplifier 4 in the temperature measuring device 3, the amplified outputs a voltage signal proportional to the absolute temperature T 1, the temperature display absolute temperature T 1 where Is done. Also,
The voltage signal of the thermocouple 1 is subtracted from the voltage signal corresponding to the temperature T 2 of the temperature measuring contact 2a of the thermocouple 2 in the temperature measuring device 3 and input to the amplifier 4, where it is amplified and the differential temperature is detected. T
Voltage output proportional to 1 -T 2 is obtained, the differential temperature T 1 -T 2
Is displayed.
【００１５】上記アンプ４，５はいずれも高入力インピ
ーダンスアンプであり、熱電対１，２の出力インピーダ
ンスが数Ω〜数十Ωであるのに対し、アンプの入力イン
ピーダンスが数十ＭΩ〜数千ＭΩであることからアンプ
により生じる計測誤差は極めて少ない。Each of the amplifiers 4 and 5 is a high input impedance amplifier, and while the output impedance of the thermocouples 1 and 2 is several Ω to several tens of Ω, the input impedance of the amplifier is several tens of MΩ to several thousand. Since it is MΩ, the measurement error caused by the amplifier is extremely small.
【００１６】なお、熱電対による温度計測においては、
実際には基準接点の温度補償のための構成または回路を
必要とするが、本実施形態では本発明の範囲外の要素で
あるため省略している。In the temperature measurement using a thermocouple,
In practice, a configuration or circuit for temperature compensation of the reference junction is required, but it is omitted in this embodiment because it is an element outside the scope of the present invention.
【００１７】[0017]
【発明の効果】本発明の熱電対を用いた温度計測装置
は、一方の熱電対が接続された絶対温度計測用アンプ
と、互いに極性を反対として接続されて形成された一方
と他方の熱電対の直列回路が接続された差温計測用アン
プを有する温度計測器を備えたことによって、熱電対を
２本使用するだけで特定部位の絶対温度と特定部位間の
差温を同時に計測することが可能になるとともに、これ
らの温度を、特に温度差の少ない絶対温度の差温につい
て、高精度で計測することが可能となる。The temperature measuring device using the thermocouple of the present invention includes an absolute temperature measuring amplifier to which one thermocouple is connected, and one and the other thermocouple formed by connecting with their polarities being opposite to each other. Since the temperature measuring instrument having the differential temperature measuring amplifier connected to the serial circuit is provided, it is possible to simultaneously measure the absolute temperature of the specific part and the differential temperature between the specific parts by using only two thermocouples. In addition to this, it becomes possible to measure these temperatures with high accuracy, especially for the absolute temperature difference with a small temperature difference.
【図１】本発明の実施の一形態に係る温度計測装置の説
明図である。FIG. 1 is an explanatory diagram of a temperature measuring device according to an embodiment of the present invention.
【図２】従来の温度計測装置の一例の説明図である。FIG. 2 is an explanatory diagram of an example of a conventional temperature measuring device.
【図３】従来の温度計測装置の他の例の説明図である。FIG. 3 is an explanatory diagram of another example of a conventional temperature measuring device.
１ 熱電対 ２ 熱電対 ３ 温度計測器 ４ アンプ ５ アンプ 1 Thermocouple 2 Thermocouple 3 Temperature Measuring Instrument 4 Amplifier 5 Amplifier
───────────────────────────────────────────────────── フロントページの続き (72)発明者 藤井 啓介 東京都調布市深大寺東町７の43の３ (72)発明者 寺岡 謙 東京都港区浜松町２丁目４番１号 宇宙開 発事業団内 (72)発明者 花谷 知良 東京都昭島市武蔵野３丁目１番１号 日本 航空電子工業株式会社昭島事業所内 (72)発明者 古川 孝 東京都昭島市武蔵野３丁目１番１号 日本 航空電子工業株式会社昭島事業所内 (72)発明者 田村 博敏 名古屋市港区大江町10番地 三菱重工業株 式会社名古屋航空宇宙システム製作所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Keisuke Fujii, 43-3, 7-3 Jindaiji Higashi-cho, Chofu-shi, Tokyo (72) Inventor Ken Teraoka 2-4-1 Hamamatsucho, Minato-ku, Tokyo Within the space development business group (72) Inventor Tomoyoshi Hanatani, 1-1 1-1 Musashino, Akishima-shi, Tokyo Japan Aviation Electronics Industry Co., Ltd. Akishima Office (72) Inventor Takashi Furukawa 3-1-1, Musashino, Akishima-shi, Tokyo Japan Aviation Electronics Industry Co., Ltd. Company Akishima Plant (72) Inventor Hirotoshi Tamura 10 Oemachi, Minato-ku, Nagoya City Mitsubishi Heavy Industries Ltd. Nagoya Aerospace Systems Works
Claims (1)
位に配設される一方と他方の熱電対、および同一方と他
方の熱電対が接続された温度計測器を備え、同温度計測
器には、上記一方の熱電対に接続された絶対温度計測用
アンプと、上記一方と他方の熱電対が互いに極性を反対
として接続されて形成された直列接続回路に接続された
差温計測用アンプが設けられたことを特徴とする熱電対
を用いた温度計測装置。1. A thermometer having one and the other thermocouples, and thermocouples to which the same thermocouple and the other thermocouple are connected, respectively, in which the respective temperature-measuring contacts are arranged at different temperature-measuring sites. Is an absolute temperature measuring amplifier connected to the one thermocouple, and a differential temperature measuring amplifier connected to a series connection circuit formed by connecting the one and the other thermocouples with their polarities opposite to each other. A temperature measuring device using a thermocouple, which is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31235195A JPH09152379A (en) | 1995-11-30 | 1995-11-30 | Temperature measuring apparatus employing thermocouple |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31235195A JPH09152379A (en) | 1995-11-30 | 1995-11-30 | Temperature measuring apparatus employing thermocouple |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09152379A true JPH09152379A (en) | 1997-06-10 |
Family
ID=18028207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31235195A Pending JPH09152379A (en) | 1995-11-30 | 1995-11-30 | Temperature measuring apparatus employing thermocouple |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09152379A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002097385A1 (en) * | 2001-05-30 | 2002-12-05 | Thermometric Ab | Absolute temperature measuring apparatus and method |
| CN102269630A (en) * | 2010-06-07 | 2011-12-07 | 罗斯蒙德公司 | Process variable transmitter with thermocouple polarity detection |
| WO2012084581A1 (en) * | 2010-12-20 | 2012-06-28 | BSH Bosch und Siemens Hausgeräte GmbH | Core temperature sensor |
| DE102017110445A1 (en) * | 2017-05-15 | 2018-11-15 | Vaillant Gmbh | Apparatus and method for measuring temperatures with thermocouples |
| RU2760923C1 (en) * | 2020-12-24 | 2021-12-01 | Федеральное государственное бюджетное учреждение науки Институт автоматики и электрометрии Сибирского отделения Российской академии наук (ИАиЭ СО РАН) | Device for measuring small temperature differences |
-
1995
- 1995-11-30 JP JP31235195A patent/JPH09152379A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002097385A1 (en) * | 2001-05-30 | 2002-12-05 | Thermometric Ab | Absolute temperature measuring apparatus and method |
| US6994467B2 (en) | 2001-05-30 | 2006-02-07 | Thermometric Ab | Absolute temperature measuring apparatus and method |
| CN102269630A (en) * | 2010-06-07 | 2011-12-07 | 罗斯蒙德公司 | Process variable transmitter with thermocouple polarity detection |
| US8864378B2 (en) | 2010-06-07 | 2014-10-21 | Rosemount Inc. | Process variable transmitter with thermocouple polarity detection |
| WO2012084581A1 (en) * | 2010-12-20 | 2012-06-28 | BSH Bosch und Siemens Hausgeräte GmbH | Core temperature sensor |
| DE102010063474B4 (en) * | 2010-12-20 | 2014-02-13 | BSH Bosch und Siemens Hausgeräte GmbH | Core probe |
| DE102017110445A1 (en) * | 2017-05-15 | 2018-11-15 | Vaillant Gmbh | Apparatus and method for measuring temperatures with thermocouples |
| DE102017110445B4 (en) * | 2017-05-15 | 2020-02-13 | Vaillant Gmbh | Device and method for measuring temperatures with thermocouples |
| RU2760923C1 (en) * | 2020-12-24 | 2021-12-01 | Федеральное государственное бюджетное учреждение науки Институт автоматики и электрометрии Сибирского отделения Российской академии наук (ИАиЭ СО РАН) | Device for measuring small temperature differences |
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