JPH0854284A - Temperature calibrating apparatus - Google Patents
Temperature calibrating apparatusInfo
- Publication number
- JPH0854284A JPH0854284A JP6210496A JP21049694A JPH0854284A JP H0854284 A JPH0854284 A JP H0854284A JP 6210496 A JP6210496 A JP 6210496A JP 21049694 A JP21049694 A JP 21049694A JP H0854284 A JPH0854284 A JP H0854284A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- optical fiber
- carbon
- radiation
- calibration
- 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
- Radiation Pyrometers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、放射温度計等の校正
に用いられる温度校正装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature calibration device used for calibration of radiation thermometers and the like.
【０００２】[0002]
【従来の技術】従来所定温度とされた黒体炉の炉底を、
被校正用の放射温度計と標準用の放射温度計とで視定
し、両者の出力を比較し、被校正用の放射温度計の校正
を行なっている（特公平５−４７０５８等ご参照）。2. Description of the Related Art The bottom of a blackbody furnace, which has been conventionally at a predetermined temperature,
The radiation thermometer for calibration and the radiation thermometer for standard are evaluated, the outputs of both are compared, and the radiation thermometer for calibration is calibrated (see Japanese Patent Publication No. 5-47058, etc.). .
【０００３】[0003]
【発明が解決しようとする課題】この場合、通常の黒体
炉では、放射率が十分大きくなく、高温での高精度の測
定が困難であった。また、光ファイバを溶融金属等に挿
入し、先端からの放射エネルギーを検出して測温するよ
うな光ファイバ放射温度計の校正は、直接、光ファイバ
先端を黒体炉内に挿入させて行なわれる。この場合、光
ファイバの先端は、空気中で高温にさらされることか
ら、ＯＨ基を吸収して失透を起し、また、光ファイバを
保護している高分子材の高温での分解による不均一な収
縮により、光フアイバに不均一な歪みが加わるマイクロ
ベンドによる失透を起し、正しい測定が困難である問題
点がある。In this case, the emissivity is not sufficiently large in a normal black body furnace, and it is difficult to measure with high accuracy at high temperature. In addition, the calibration of an optical fiber radiation thermometer that inserts an optical fiber into molten metal or the like and detects the radiant energy from the tip to measure the temperature is performed by inserting the tip of the optical fiber directly into the blackbody furnace. Be done. In this case, the tip of the optical fiber is exposed to a high temperature in the air, so that the OH group is absorbed to cause devitrification, and the polymer material protecting the optical fiber is decomposed at a high temperature. The uniform shrinkage causes devitrification due to microbends that add non-uniform strain to the optical fiber, and there is a problem that correct measurement is difficult.
【０００４】この発明の目的は、以上の点に鑑み、放射
温度計の校正を高精度に可能とした温度校正装置を提供
することである。SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to provide a temperature calibration device capable of highly accurately calibrating a radiation thermometer.
【０００５】[0005]
【課題を解決するための手段】この発明は、中央有底部
を有する放射管と、この放射管内の中央有底部に近接し
て設けられたカーボン円筒体とを備え、このカーボン円
筒体を介して中央有底部を測温することにより温度校正
を行うようにした温度校正装置である。SUMMARY OF THE INVENTION The present invention comprises a radiant tube having a central bottom portion and a carbon cylindrical body provided in the radiant tube in the vicinity of the central bottom portion. It is a temperature calibrating device that calibrates the temperature by measuring the temperature at the bottom of the center.
【０００６】[0006]
【実施例】図１は、この発明の一実施例を示す校正説明
図である。図において、１は両端が開口の炭化ケイ素Ｓ
ｉＣ等よりなる発熱体、２は発熱体１の内部に位置し炭
化ケイ素子ＳｉＣ等よりなる放射管（空洞部）で、両端
を絶縁体３１、３２を介し空間をもたせて保持される。
放射管２の内部には、長手方向のほぼ中央に中央有底部
（ターゲット）４が設けられている。発熱体１の外周は
セラミックウールのような断熱材５で保温されている。
そして、前後に保持板６１、６２を設け、全体として、
温度校正用の黒体炉としている。そして、中央有底部４
の一方の側に熱電対等の温度センサ７を設けて測温し、
図示しない制御手段で発熱体１への電圧・電流等の制御
を行い所定温度の黒体炉とする。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a calibration explanatory view showing an embodiment of the present invention. In the figure, 1 is silicon carbide S having openings at both ends.
A heating element 2 made of iC or the like is a radiation tube (cavity) located inside the heating element 1 and made of a silicon carbide element SiC or the like, and is held at both ends with a space between the insulators 31 and 32.
Inside the radiation tube 2, a central bottomed portion (target) 4 is provided substantially at the center in the longitudinal direction. The outer circumference of the heating element 1 is kept warm by a heat insulating material 5 such as ceramic wool.
Then, holding plates 61 and 62 are provided at the front and rear, and as a whole,
It is a blackbody furnace for temperature calibration. And the central bottom part 4
A temperature sensor 7 such as a thermocouple is provided on one side to measure the temperature,
The control means (not shown) controls the voltage, current, etc. to the heating element 1 to obtain a blackbody furnace having a predetermined temperature.
【０００７】放射管２の中央有底部４の他方の側には、
近接して中空のカーボン円筒体８が設けられ、また、中
央有底部４と離れた位置に円筒状のカーボン体９を設け
ている。On the other side of the central bottomed part 4 of the radiant tube 2,
A hollow carbon cylindrical body 8 is provided in close proximity to the central bottomed portion 4, and a cylindrical carbon body 9 is provided at a position apart from the central bottomed portion 4.
【０００８】そして、側板６１に設けられた支持具１０
に支えられた挿入管１１が放射管２内に挿入され、この
挿入管１１を通して、被校正用の光ファイバ放射温度計
の光ファイバ１２がアルミナ製のガイド管１３に案内さ
れてカーボン円筒体８内に位置され、好ましくはその先
端は中央有底部４の中心に近づける。そして、この中央
有底部４の中心は、図示しない標準の放射温度計１４で
視定され、光ファイバ１２の他端の測定手段の出力と比
較し、校正が行われる。Then, the supporting tool 10 provided on the side plate 61.
The insertion tube 11 supported by the is inserted into the radiation tube 2, and the optical fiber 12 of the optical fiber radiation thermometer to be calibrated is guided by the alumina guide tube 13 through the insertion tube 11 and the carbon cylinder 8 It is located inside and preferably its tip is close to the center of the central bottom part 4. Then, the center of the central bottomed portion 4 is calibrated by a standard radiation thermometer 14 (not shown) and compared with the output of the measuring means at the other end of the optical fiber 12 for calibration.
【０００９】つまり、光ファイバ１２は、その外周が多
くは高分子材で被覆されているので、あらかじめ十分に
燃焼させて炭化させ十分な所要長さ分その先端を焼成し
ておく。これにより、高分子材の分解によって起こるマ
イクロベンドによる失透を防ぐことができる。そして、
あらかじめたとえば１５００℃のような高温とされた放
射管２内にガイド管１２に挿入して挿入管１１を介して
光ファイバ１２の先端をカーボン円筒体８内に位置させ
る。このことにより、光ファイバ１２の先端に付着して
いるカーボンは燃えずに残り光ファイバ１２の失透を生
じることなく、安定的な測定ができる。また、カーボン
体９等が徐々に燃焼することで、内部はＣＯ２の存在す
る非酸化雰囲気となり、大気への開放状態であっても、
光ファイバ１２の先端は汚損されず失透防止が図れる。
また、カーボン円筒体８により、光ファイバ１２の先端
の設置位置を一定にでき、安定した測定が可能となる。That is, since the outer circumference of the optical fiber 12 is mostly covered with a polymer material, the tip of the optical fiber 12 is fired for a sufficient length in advance by sufficient combustion and carbonization. This makes it possible to prevent devitrification due to microbending caused by the decomposition of the polymer material. And
The guide tube 12 is inserted into the radiation tube 2 which has been heated to a high temperature such as 1500 ° C. in advance, and the tip of the optical fiber 12 is positioned in the carbon cylindrical body 8 through the insertion tube 11. As a result, the carbon adhering to the tip of the optical fiber 12 does not burn and the devitrification of the optical fiber 12 does not occur, and stable measurement can be performed. Further, due to the gradual combustion of the carbon body 9 and the like, the inside becomes a non-oxidizing atmosphere in which CO2 exists, and even when it is open to the atmosphere,
The tip of the optical fiber 12 is not contaminated and devitrification can be prevented.
Further, the carbon cylindrical body 8 makes it possible to make the installation position of the tip of the optical fiber 12 constant, thereby enabling stable measurement.
【００１０】このように光ファイバ１２の先端をカーボ
ン円筒体８と中央有底部４とで形成される空洞に位置さ
せて測温するとともに、この中央有底部４を標準の放射
温度計で測温し、両者を比較することで、高温での実際
と等しい状態での温度校正が可能となる。As described above, the tip of the optical fiber 12 is positioned in the cavity formed by the carbon cylinder 8 and the central bottomed portion 4 to measure the temperature, and the central bottomed portion 4 is measured with a standard radiation thermometer. However, by comparing the two, it becomes possible to perform temperature calibration under the same conditions as at actual high temperatures.
【００１１】また、カーボン体９の代わりに、または、
これに加えてＡｒ等の不活性ガスを放射管２内に送入す
ることで、内部を非酸化雰囲気にでき、光ファイバ１２
の先端の劣化を防止できる。また、カーボン円筒体８を
設けることで、黒体炉の実効放射率が向上し、いっそう
高性能の黒体炉となり、光ファイバ以外の一般の放射温
度計や熱電対等の比較校正にも用いることができる。Further, instead of the carbon body 9, or
In addition to this, by sending an inert gas such as Ar into the radiation tube 2, the inside can be made into a non-oxidizing atmosphere, and the optical fiber 12
The deterioration of the tip of the can be prevented. Further, by providing the carbon cylindrical body 8, the effective emissivity of the black body furnace is improved, and the black body furnace has a higher performance, and it can be used for comparative calibration of general radiation thermometers other than optical fibers, thermocouples, etc. You can
【００１２】たとえば、カーボン円筒体８の中空の空洞
の長さをＬ、半径ｒとの比を４とすれば、カーボン円筒
体８のない放射管２のみによる本黒体炉の空洞放射率は
約０．９９であるが（ＪＩＳ Ｃ１６１２ 第２５頁参
考４図４ 高温域比較黒体炉）、カーボンの放射率を
０．９とすると、カーボン円筒体８を用いることにより
実効放射率ε＝０．９９４となり、その比が８では、ε
＝０．９９８となり、理想的な黒体条件に近ずく（計測
自動制御学会発行「新編温度計測」２５０頁等参照）。For example, if the length of the hollow cavity of the carbon cylinder 8 is L and the ratio to the radius r is 4, the cavity emissivity of this blackbody furnace only by the radiation tube 2 without the carbon cylinder 8 is: Although it is about 0.99 (JIS C1612, page 25, reference 4, FIG. 4 high temperature comparative blackbody furnace), assuming that the emissivity of carbon is 0.9, the effective emissivity ε = 0 by using the carbon cylindrical body 8. .994, and when the ratio is 8, ε
= 0.998, which is close to the ideal black body condition (see “New Edition Temperature Measurement” published by the Society of Instrument and Control Engineers, page 250).
【００１３】次に比較校正誤差に付いて考察する。たと
えば上記文献１９９〜２００頁を参照し、放射率変化ｄ
εと温度変化ｄＴとの関係は、次式となる。Next, the comparative calibration error will be considered. For example, referring to the above-mentioned documents 199 to 200, emissivity change d
The relationship between ε and the temperature change dT is as follows.
【００１４】ｄＴ＝（１／ｎ）・（ｄε／ε）・Ｔ ここで、ε＝１、ｎ＝Ｃ２／λＴを代入して整理する
と、次式となる。DT = (1 / n) .multidot. (D.epsilon ./. Epsilon.). Multidot.T Here, substituting .epsilon. = 1 and n = C2 / .lambda.T gives the following formula.
【００１５】ｄＴ＝λ・ｄε（Ｔ2 ／Ｃ２） ２つの波長λ１、λ２についての測定誤差を改めてｄＴ
とおくと次式となる。DT = λdε (T 2 / C2) The measurement error for the two wavelengths λ1 and λ2 is again dT
If it puts it, it will become the following formula.
【００１６】 ｄＴ＝（λ１−λ２）ｄε・（Ｔ2 ／Ｃ２） （１） Ｃ２＝０．０１４３８８ｍ・Ｋ、Ｔ＝１８００Ｋとし、
光ファイバ１２による測定波長λ１＝１．５５μｍ、標
準の放射温度計１４の測定波長λ２＝０．９μｍとすれ
ば、カーボン円筒体８がＬ／ｒ＝４では、ｄε＝０．０
０６となり、結局ｄＴ＝０．８８（Ｋ）となり１（Ｋ）
以内の十分な比較校正が可能となる。Ｌ／ｒ＝８では、
ｄε＝０．００２となり、ｄＴ＝０．２９（Ｋ）とな
り、さらに、誤差の少い温度校正が可能となる。つま
り、前述のカーボン円筒体８がない放射管２のみによる
場合はｄε＝０．０１でｄＴ＝１．４６（Ｋ）であるの
と比べて、２〜５倍改善される。DT = (λ1−λ2) dε · (T 2 / C2) (1) C2 = 0.014388m · K and T = 1800K,
If the measurement wavelength λ1 of the optical fiber 12 is 1.55 μm and the measurement wavelength λ2 of the standard radiation thermometer 14 is 0.9 μm, dε = 0.0 when the carbon cylinder 8 is L / r = 4.
06, eventually dT = 0.88 (K) and 1 (K)
Sufficient comparative calibration within is possible. With L / r = 8,
Since dε = 0.002 and dT = 0.29 (K), temperature calibration with a small error becomes possible. That is, in the case where only the radiation tube 2 without the carbon cylinder 8 is used, it is improved by 2 to 5 times as compared with dT = 0.01 and dT = 1.46 (K).
【００１７】[0017]
【発明の効果】以上述べたように、この発明は、放射管
内にカーボン円筒体を設けるようにした温度校正装置で
ある。このため、黒体炉としての放射率が１に近くな
り、温度校正誤差を大幅に少くすることができ、高精度
の校正が可能となる。また、カーボン体や不活性ガスを
用いることで放射管の内部をＣＯ２等の存在する非酸化
雰囲気となり、光ファイバ温度計の先端を挿入する場
合、その失透や劣化を防止でき、安定的な測定が可能と
なる。また、光ファイバの先端を焼成して炭化処理して
用いることにより、その被覆が燃焼して劣化、汚損を生
じることはない。また、カーボン円筒体の存在により、
光ファイバの先端の挿入位置を一定にでき、安定的な測
定が可能となる。また、光ファイバ放射温度計の他に一
般の放射温度計の校正にも、用いることができ、広範囲
な温度の校正可能となる。As described above, the present invention is a temperature calibrating device in which a carbon cylinder is provided inside the radiation tube. Therefore, the emissivity of the black body furnace is close to 1, the temperature calibration error can be significantly reduced, and the calibration with high accuracy can be performed. Further, by using a carbon body or an inert gas, the inside of the radiation tube becomes a non-oxidizing atmosphere in which CO2 or the like exists, and when the tip of the optical fiber thermometer is inserted, devitrification and deterioration thereof can be prevented and stable. It becomes possible to measure. Further, by firing and carbonizing the tip of the optical fiber, the coating does not burn and cause deterioration or contamination. Also, due to the presence of the carbon cylinder,
The insertion position of the tip of the optical fiber can be made constant, and stable measurement is possible. Further, it can be used for calibration of general radiation thermometers as well as optical fiber radiation thermometers, and it becomes possible to calibrate a wide range of temperatures.
【図１】この発明の一実施例を示す校正説明図である。FIG. 1 is a calibration explanatory view showing an embodiment of the present invention.
１ 発熱体 ２ 放射管 ３１、３２ 絶縁体 ４ 中央有底部 ５ 断熱材 ６１、６２ 保持板 ７ 温度センサ ８ カーボン円筒体 ９ カーボン体 １０ 支持具 １１ 挿入管 １２ 光ファイバ １３ ガイド管 １４ 標準の放射温度計 DESCRIPTION OF SYMBOLS 1 Heating element 2 Radiation tube 31, 32 Insulator 4 Central bottomed part 5 Heat insulating material 61, 62 Holding plate 7 Temperature sensor 8 Carbon cylinder 9 Carbon body 10 Supporting tool 11 Insertion tube 12 Optical fiber 13 Guide tube 14 Standard radiation temperature Total
Claims (4)
内の中央有底部に近接して設けられたカーボン円筒体と
を備え、このカーボン円筒体を介して中央有底部を測温
することにより温度校正を行うことを特徴とする温度校
正装置。1. A radiation tube having a central bottom portion, and a carbon cylindrical body provided adjacent to the central bottom portion in the radiation tube, wherein the temperature of the central bottom portion is measured through the carbon cylindrical body. A temperature calibration device characterized by performing temperature calibration by means of.
カーボン体を設けるか、または、放射管内に不活性ガス
を送入することを特徴とする請求項１記載の温度校正装
置。2. The temperature calibrating device according to claim 1, wherein a carbon body is provided at a position away from the bottom of the central portion of the radiation tube, or an inert gas is fed into the radiation tube.
内部に位置させて比較校正を行うことを特徴とする請求
項１または請求項２記載の温度校正装置。3. The temperature calibrating device according to claim 1, wherein the tip end of the optical fiber is positioned inside the carbon cylindrical body for comparative calibration.
を特徴とする請求項３記載の温度校正装置。4. The temperature calibrating apparatus according to claim 3, wherein an optical fiber whose tip is fired is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6210496A JPH0854284A (en) | 1994-08-11 | 1994-08-11 | Temperature calibrating apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6210496A JPH0854284A (en) | 1994-08-11 | 1994-08-11 | Temperature calibrating apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0854284A true JPH0854284A (en) | 1996-02-27 |
Family
ID=16590324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6210496A Pending JPH0854284A (en) | 1994-08-11 | 1994-08-11 | Temperature calibrating apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0854284A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007271578A (en) * | 2006-03-31 | 2007-10-18 | Seiko Npc Corp | Infrared sensor measurement device |
| JP2011215155A (en) * | 2011-06-15 | 2011-10-27 | Seiko Npc Corp | Infrared sensor measuring device |
| JP2012186398A (en) * | 2011-03-08 | 2012-09-27 | Nippon Avionics Co Ltd | Joining device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02107049U (en) * | 1989-02-14 | 1990-08-24 | ||
| JPH05142049A (en) * | 1991-11-15 | 1993-06-08 | Nkk Corp | Consumable type optical fiber thermometer |
-
1994
- 1994-08-11 JP JP6210496A patent/JPH0854284A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02107049U (en) * | 1989-02-14 | 1990-08-24 | ||
| JPH05142049A (en) * | 1991-11-15 | 1993-06-08 | Nkk Corp | Consumable type optical fiber thermometer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007271578A (en) * | 2006-03-31 | 2007-10-18 | Seiko Npc Corp | Infrared sensor measurement device |
| JP2012186398A (en) * | 2011-03-08 | 2012-09-27 | Nippon Avionics Co Ltd | Joining device |
| JP2011215155A (en) * | 2011-06-15 | 2011-10-27 | Seiko Npc Corp | Infrared sensor measuring device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2987459B1 (en) | Temperature fixed point crucible, temperature fixed point device and thermometer calibration method | |
| Yamada et al. | Application of metal (carbide)–carbon eutectic fixed points in radiometry | |
| JP4639383B2 (en) | Temperature fixed point cell, temperature fixed point device, and thermometer calibration method | |
| US6641299B2 (en) | Fixed-point cell, thermometer calibration method and fixed-point temperature realizing apparatus | |
| JPH0854284A (en) | Temperature calibrating apparatus | |
| US4204770A (en) | Graphite furnace bore temperature measurements in flameless atomic absorption spectroscopy | |
| RU2325622C1 (en) | Technique of controlling authenticity of readings of thermoelectric converter during operation | |
| JP3392936B2 (en) | Temperature calibration device | |
| Murthy et al. | Radiative Calibration of Heat Flux Sensors at NIST: An Overview | |
| HU180977B (en) | Referance heat radiator | |
| JP2958428B2 (en) | SiC protective tube for thermocouple | |
| US4440510A (en) | Pyrometric gas temperature measurement system | |
| Ulanovskiy et al. | Tungsten–Rhenium Thermocouples Calibration in Ultra-High Temperature Range | |
| US4214117A (en) | Furnace heated by radiation | |
| Chu et al. | An evaluation of infrared thermometers by the intercomparison of standard Black body sources | |
| Lovas et al. | Meeting RTP temperature accuracy requirements: measurement and calibrations at NIST | |
| JP3130908B2 (en) | Temperature measurement method for heat treatment furnace for substrates | |
| KR200206000Y1 (en) | Optical pyrometer and thermocouple combined calibration tube | |
| JP3552861B2 (en) | Surface temperature measurement method for objects in heating furnace | |
| Freeman | Distributed Seebeck effect at high temperatures | |
| RU2720819C1 (en) | Device for calibration of high-temperature thermocouples | |
| Fischer et al. | Calibration of tungsten strip lamps as transfer standards for temperature | |
| Coslovi et al. | A Radiometric Determination of the Thermodynamic Temperature Interval between the Silver and Gold Freezing Points | |
| Ulanovskiy et al. | An approach to Tungsten-rhenium thermocouple calibration in the temperature range 1200-2500° C | |
| Meyer | Effects of extraneous radiation on the performance of lightpipe radiation thermometers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Effective date: 20040225 Free format text: JAPANESE INTERMEDIATE CODE: A971007 |
|
| A131 | Notification of reasons for refusal |
Effective date: 20040302 Free format text: JAPANESE INTERMEDIATE CODE: A131 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20040628 |