JP3106218B2 - Thermal analyzer - Google Patents
Thermal analyzerInfo
- Publication number
- JP3106218B2 JP3106218B2 JP04079660A JP7966092A JP3106218B2 JP 3106218 B2 JP3106218 B2 JP 3106218B2 JP 04079660 A JP04079660 A JP 04079660A JP 7966092 A JP7966092 A JP 7966092A JP 3106218 B2 JP3106218 B2 JP 3106218B2
- Authority
- JP
- Japan
- Prior art keywords
- junction
- metal wire
- temperature
- metal
- wire
- 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.)
- Expired - Fee Related
Links
Landscapes
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、材料の温度と物性とを
同時に測定することにより材料の物理的性質の温度依存
性を調べる熱分析装置の、特に温度測定の精度向上を目
的とした改良に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a thermal analyzer for measuring the temperature dependence of physical properties of a material by simultaneously measuring the temperature and physical properties of the material. It is about.
【０００２】[0002]
【従来の技術】従来、この種の発明に関しては、以下の
２種類の冷接点補償のものが用いられていた。 図２に示すように、２種類の金属で熱電対を形成
し、第１の接合点を試料近傍に配置し、第２の接合点を
氷水中に浸し、同種金属線間の電圧を測定して試料温度
を測るもの。2. Description of the Related Art Conventionally, the following two types of cold junction compensation have been used for this type of invention. As shown in FIG. 2, a thermocouple is formed of two kinds of metals, a first junction is disposed near a sample, a second junction is immersed in ice water, and a voltage between the same metal wires is measured. To measure the sample temperature.
【０００３】 図３に示すように、２種類の金属の接
合により熱電対を形成し、接合点近傍に試料を配置し、
金属線間の電圧を測定するための銅製電極との接合点近
傍に感熱素子を配置して感熱素子の信号に基づいて両金
属線間の電圧を補正することにより試料温度を測るも
の。As shown in FIG. 3, a thermocouple is formed by joining two kinds of metals, a sample is arranged near a joining point,
A method of measuring a sample temperature by arranging a thermosensitive element near a junction with a copper electrode for measuring a voltage between metal wires and correcting a voltage between the two metal wires based on a signal of the thermosensitive element.
【０００４】[0004]
【発明が解決しようとする課題】上記従来技術において
は、いずれも熱電対の冷接点補償の機能を有し、試料温
度の測定精度改善に効果を有するが、以下の問題を含ん
でいた。まず、上記項の構成では、第２の接合点の温
度を０℃の一定に保つため氷水を使用するが、氷水の消
失と補給の問題が付随する。また、上記項の構成にお
いては、熱電対の出力電圧を測定するための各金属線と
銅との間の各接合点に発生する熱起電力の和が、熱電対
の熱起電力と完全には一致しないことから、感熱素子の
信号に基づいて熱電対の出力電圧を補正して正しい試料
温度を測定することが難しかった。The above prior arts all have a function of compensating for a cold junction of a thermocouple and are effective in improving the measurement accuracy of a sample temperature, but have the following problems. First, in the configuration of the above item, ice water is used to keep the temperature of the second junction point constant at 0 ° C., but there is a problem of disappearance and replenishment of ice water. In the configuration of the above item, the sum of the thermoelectromotive force generated at each junction between each metal wire and copper for measuring the output voltage of the thermocouple is completely equal to the thermoelectromotive force of the thermocouple. Therefore, it is difficult to correct the output voltage of the thermocouple based on the signal of the thermosensitive element and measure the correct sample temperature.
【０００５】本発明は、このような欠点を解消し、温度
測定の精度を向上した熱分析装置を提供することを目的
とする。[0005] It is an object of the present invention to eliminate the above-mentioned drawbacks and to provide a thermal analyzer having improved temperature measurement accuracy.
【０００６】[0006]
【課題を解決するための手段】本発明は上記の欠点を解
消するために開発されたもので、その主たる構成要件
は、第１の金属材料からなる金属線１と、前記金属線１
の一端に接合された第２の金属材料からなる金属線２ａ
と、前記金属線１の他端に接合された第２の金属材料か
らなる金属線２ｂと、前記金属線１と前記金属線２ｂと
の接合点に対し良好な熱接触状態に配置された感熱素子
とからなっている。SUMMARY OF THE INVENTION The present invention has been developed to solve the above-mentioned drawbacks, and its main components are a metal wire 1 made of a first metal material and a metal wire 1 made of a first metal material.
Wire 2a made of a second metal material joined to one end of
And a heat-sensitive material arranged in good thermal contact with a metal wire 2b made of a second metal material bonded to the other end of the metal wire 1 and a bonding point between the metal wire 1 and the metal wire 2b. It consists of an element.
【０００７】[0007]
【作用】前記金属線１と前記金属線２ａおよび２ｂは、
２つの接合点Ａおよび接合点Ｂからなる熱電対を形成
し、前記金属線２ａと前記金属線２ｂとの間の電圧は、
接合点Ａの温度と接合点Ｂの温度とに依存する。一方、
接合点Ｂに良好な熱的接触状態に配置された感熱素子は
接合点Ｂの温度を検出している。The metal wire 1 and the metal wires 2a and 2b are
A thermocouple consisting of two junctions A and B is formed, and the voltage between the metal wire 2a and the metal wire 2b is
It depends on the temperature of the junction A and the temperature of the junction B. on the other hand,
A thermosensitive element arranged in good thermal contact with the junction B detects the temperature of the junction B.
【０００８】従って、前記金属線２ａと前記金属線２ｂ
との間の電圧を測定し、前記感熱素子の信号に基づいて
接合点Ｂにおいて生じている熱起電力値を補正すること
により、接合点Ａの温度を正確に測定するという目的を
達する。Therefore, the metal wire 2a and the metal wire 2b
Is measured, and the thermoelectromotive force generated at the junction B is corrected based on the signal of the thermosensitive element, thereby achieving the object of accurately measuring the temperature at the junction A.
【０００９】[0009]
【実施例】以下、本発明を一実施例に示した図面に基づ
き詳細に説明すると、図１中、１はアルメル線であり、
アルメル線１の一端Ａにおいてクロメル線２ａが接合さ
れている。一方、前記アルメル線１の他端Ｂには別のク
ロメル線２ｂが接合されており、接合点Ｂには良好な熱
接触状態で感熱素子３が貼りつけられ、接合点Ｂおよび
感熱素子３は一体で熱的変動の比較的小さな場所に配置
されている。また、前記クロメル線２ａおよびクロメル
線２ｂは、両者の間の電圧を測定するため、それぞれ銅
線４ａおよび４ｂに接合され、銅線４ａ、４ｂは差動増
幅器５に接続されている。前記感熱素子３は増幅器６に
接続され、前記差動増幅器５および増幅器６は共に減算
器７に接続されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings showing one embodiment. In FIG.
A chromel wire 2a is joined at one end A of the alumel wire 1. On the other hand, another chromel wire 2b is joined to the other end B of the alumel wire 1, and the thermosensitive element 3 is attached to the junction B in a good thermal contact state. It is arranged in a place where thermal fluctuations are relatively small. The chromel wire 2a and the chromel wire 2b are joined to copper wires 4a and 4b, respectively, for measuring a voltage between the two, and the copper wires 4a and 4b are connected to a differential amplifier 5. The thermal element 3 is connected to an amplifier 6, and the differential amplifier 5 and the amplifier 6 are both connected to a subtracter 7.
【００１０】前記接合点Ａの近傍には試料８が配置され
ており、試料８の周囲には試料８の温度を調節する目的
でヒータ９が配設されている。ヒータ９を動作させる
と、試料８と同時に接合点Ａの温度が上がり、接合点Ａ
にゼーベック効果による熱起電力が発生する。接合点Ａ
における熱起電力と接合点Ｂにおける熱起電力との差は
前記銅線４ａおよび４ｂを介して電圧信号として前記差
動増幅器５に送られる。差動増幅器５は、微小な熱起電
力差信号を増幅する増幅器として作用する。A sample 8 is arranged near the junction A, and a heater 9 is arranged around the sample 8 for the purpose of adjusting the temperature of the sample 8. When the heater 9 is operated, the temperature of the joining point A rises simultaneously with the sample 8, and the joining point A
A thermoelectromotive force is generated due to the Seebeck effect. Junction point A
Is sent to the differential amplifier 5 as a voltage signal via the copper wires 4a and 4b. The differential amplifier 5 functions as an amplifier that amplifies a small thermoelectromotive force difference signal.
【００１１】一方、前記接合点Ｂに貼りつけられた感熱
素子３は、接合点Ｂとともに、比較的温度の安定した場
所に配置されるが、種々の条件により温度の変化を生
じ、感熱素子により測定される電圧信号は増幅器６に送
られ、温度１℃あたりの電圧値が、前記差動増幅器の出
力と一致するような増幅度で規格化される。減算器７
は、前記差動増幅器５と前記増幅器６との電圧差を出力
することにより、前記接合点Ｂの温度変動による出力変
動が相殺された接合点Ａのみの温度に依存する電圧を出
力する。すなわち、減算器７の出力は試料８の温度を正
確に測定するという目的を達成している。On the other hand, the thermo-sensitive element 3 attached to the junction B is arranged at a relatively stable temperature together with the junction B. However, the temperature changes due to various conditions, and The voltage signal to be measured is sent to the amplifier 6, and the voltage value per 1 ° C. of the temperature is normalized by the amplification degree so as to coincide with the output of the differential amplifier. Subtractor 7
Outputs the voltage difference between the differential amplifier 5 and the amplifier 6 to output a voltage dependent only on the temperature at the junction A where the output fluctuation due to the temperature fluctuation at the junction B is canceled. That is, the output of the subtracter 7 achieves the purpose of accurately measuring the temperature of the sample 8.
【００１２】本実施例の説明においては、感熱素子の信
号による熱起電力信号の補正を電圧比較の考え方に基づ
いて説明したが、感熱素子の信号を一旦温度値に変換し
た後、この温度値に対応する熱起電力（電圧値）を、元
の熱起電力信号から差し引くことによっても目的は達成
され、特に、熱起電力特性の非線形度合いの大きい熱電
対を使用した場合、試料８の温度測定精度はさらに改善
される。In the description of the present embodiment, the correction of the thermoelectromotive force signal by the signal of the thermosensitive element has been described on the basis of the concept of voltage comparison. The objective can also be achieved by subtracting the thermoelectromotive force (voltage value) corresponding to the above from the original thermoelectromotive force signal. The measurement accuracy is further improved.
【００１３】また、これまでの実施例中で特に断らなか
ったが、実施例に示されているアルメル、クロメル、銅
などの金属材料の種類が変更されても本発明の目的が達
成されるのはもちろんのことである。さらに、感熱素子
としては、白金抵抗体、サーミスタ、その他の温度ＩＣ
などの種類があり、いずれも本発明の目的を達するため
の感熱素子として使用できる。しかも、本発明は熱分析
装置で一般に使われる試料以外の、例えばヒータ温度の
測定精度改善にも応用できる。Although not particularly specified in the above embodiments, the object of the present invention can be achieved even if the type of metal material such as alumel, chromel, or copper shown in the embodiments is changed. Of course. Furthermore, as the thermal element, a platinum resistor, a thermistor, and other temperature ICs
And any of them can be used as a heat-sensitive element for achieving the object of the present invention. Moreover, the present invention can be applied to, for example, improvement of the measurement accuracy of a heater temperature other than a sample generally used in a thermal analyzer.
【００１４】[0014]
【発明の効果】以上のように本発明によれば、接合点Ａ
におけると同一の材料で構成される接合点Ｂを設け、接
合点Ｂの温度を感熱素子３によって正確に測定すること
により、熱電対の冷接点補償を行ったから、熱電対の熱
起電力をもとに試料８の温度を正確に測定することがで
きる。As described above, according to the present invention, the joining point A
Since the junction B made of the same material as in the above is provided, and the temperature of the junction B is accurately measured by the thermosensitive element 3, the cold junction compensation of the thermocouple is performed. At this time, the temperature of the sample 8 can be accurately measured.
【００１５】また、熱電対素線（クロメル線）２ａ、２
ｂから差動増幅器５に到る異種金属の接合部を完全に対
称に構成することができるので、装置構成が複雑になり
各種コネクタを使用した場合においても、異種金属接合
部に発生する熱起電力は相殺し、迷起電力の発生を最小
限に抑えることができ、試料８の温度を正確に測定でき
るという効果をも有する。さらに、本発明はヒータ温度
測定精度の改善に対しても同様の効果をもたらす。The thermocouple wires (chromel wires) 2a, 2a
b, the junction of the dissimilar metal from the differential amplifier 5 to the differential amplifier 5 can be configured completely symmetrically, so that the device configuration becomes complicated and even when various connectors are used, heat generated at the dissimilar metal junction is generated. The power is offset, the generation of stray power can be minimized, and the temperature of the sample 8 can be accurately measured. Further, the present invention has a similar effect for improving the heater temperature measurement accuracy.
【図１】本発明の一実施例を示す説明図である。FIG. 1 is an explanatory diagram showing one embodiment of the present invention.
【図２】従来例を示す説明図である。FIG. 2 is an explanatory diagram showing a conventional example.
【図３】他の従来例を示す説明図である。FIG. 3 is an explanatory view showing another conventional example.
１ アルメル線 ２ａ、２ｂ クロメル線 ３ 感熱素子 ４ａ、４ｂ 銅線 ５ 差動増幅器 ６ 増幅器 ７ 減算器 ８ 試料 ９ ヒータ DESCRIPTION OF SYMBOLS 1 Alumel wire 2a, 2b Chromel wire 3 Thermal element 4a, 4b Copper wire 5 Differential amplifier 6 Amplifier 7 Subtractor 8 Sample 9 Heater
Claims (1)
記金属線１の一端に接合された第２の金属材料からなる
金属線２ａと、前記金属線１の他端に接合された第２の
金属材料からなる金属線２ｂと、前記金属線１と前記金
属線２ｂとの接合点に対し、良好な熱接触状態に配置さ
れた感熱素子とを備え、前記金属線２ａと前記金属線２
ｂとの間の電圧信号および前記感熱素子の信号に基づ
き、前記金属線１と前記金属線２ａとの接合点の温度を
測定することを特徴とする熱分析装置。A metal wire made of a first metal material, a metal wire made of a second metal material joined to one end of the metal wire, and a metal wire joined to the other end of the metal wire. A metal wire 2b made of a second metal material; and a heat-sensitive element disposed in good thermal contact with a junction between the metal wire 1 and the metal wire 2b. Line 2
b. A thermal analyzer that measures a temperature at a junction between the metal wire 1 and the metal wire 2a based on a voltage signal between the metal wire 1 and the signal of the thermosensitive element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04079660A JP3106218B2 (en) | 1992-04-01 | 1992-04-01 | Thermal analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04079660A JP3106218B2 (en) | 1992-04-01 | 1992-04-01 | Thermal analyzer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05281050A JPH05281050A (en) | 1993-10-29 |
| JP3106218B2 true JP3106218B2 (en) | 2000-11-06 |
Family
ID=13696313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04079660A Expired - Fee Related JP3106218B2 (en) | 1992-04-01 | 1992-04-01 | Thermal analyzer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3106218B2 (en) |
-
1992
- 1992-04-01 JP JP04079660A patent/JP3106218B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05281050A (en) | 1993-10-29 |
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