JPS63100331A - Microwave level measuring instrument - Google Patents
Microwave level measuring instrumentInfo
- Publication number
- JPS63100331A JPS63100331A JP61246824A JP24682486A JPS63100331A JP S63100331 A JPS63100331 A JP S63100331A JP 61246824 A JP61246824 A JP 61246824A JP 24682486 A JP24682486 A JP 24682486A JP S63100331 A JPS63100331 A JP S63100331A
- Authority
- JP
- Japan
- Prior art keywords
- measurement
- window
- gate
- dielectric
- microwave
- 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.)
- Granted
Links
- 238000005259 measurement Methods 0.000 claims abstract description 53
- 238000010926 purge Methods 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000007670 refining Methods 0.000 claims abstract description 4
- 239000010445 mica Substances 0.000 claims description 5
- 229910052618 mica group Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 17
- 239000002184 metal Substances 0.000 abstract description 14
- 229910052751 metal Inorganic materials 0.000 abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 238000007664 blowing Methods 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 abstract 2
- 239000000428 dust Substances 0.000 description 10
- 229910001873 dinitrogen Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、高温の転炉等の金桟精錬炉内の溶融金属レベ
ル等を非接触で測定するマイクロ波レベル測定装置に関
する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a microwave level measuring device that non-contactly measures the level of molten metal in a metal refining furnace such as a high-temperature converter.
（従来の技術）
第６図は特開昭５８−２８６５４の転炉スロッピング予
知装置を示す。溶銑（ａ）、スラグ（ｂｌを収容する転
炉（ｃ）の上方のＯＧフードｆｄｌを貫通しジャケット
（ｅ）を設けその上にマイクロ波アンテナ（ｆｌを配置
し、マイクロ波発生回路（ｇ）、信号処理回路（ｈｌと
接続したマイクロ波回路（ｉ）によりマイクロ波を湯面
に放射する。炉内の高温ガスの影響を受けないようにジ
ャケット内部はＮ、ガス等でパージを行い、アンテナは
水冷構造としている。(Prior Art) FIG. 6 shows a converter slopping prediction device disclosed in Japanese Patent Application Laid-Open No. 58-28654. A jacket (e) is provided by penetrating the OG hood fdl above the converter (c) that accommodates hot metal (a) and slag (bl), and a microwave antenna (fl is placed above it), and a microwave generation circuit (g) is installed. , the microwave circuit (i) connected to the signal processing circuit (hl) radiates microwaves to the hot water surface.The inside of the jacket is purged with N, gas, etc. to avoid being affected by the high temperature gas in the furnace, and the antenna is has a water-cooled structure.
第７図は実開昭６０−１５２９７４のマイクロ波距離測
定装置を示す。FIG. 7 shows a microwave distance measuring device of Utility Model Application No. 60-152974.
信号処理回路（ｈ）に接続したマイクロ波回路（ｉ）お
ヨヒアンテナ（ｆｌをジャケット（ｅ）の冷却ボックス
内に配置しその下部に繊維層からなる熱、・ゲスト遮へ
い板（ｊ）を設け、上方から冷却空気（ωを流し遮へい
板のところで溶銑（ａｌからの高温ガス（１）に対抗さ
せている。The microwave circuit (i) Oyohi antenna (fl) connected to the signal processing circuit (h) is placed in the cooling box of the jacket (e), and a heat/guest shielding plate (j) made of a fiber layer is provided below it. Cooling air (ω) is flowed from above to oppose the high temperature gas (1) from the hot metal (Al) at the shield plate.
（発明が解決しようとする問題点）
マイクロ波を用いて高温炉内の内容物のレベルを測定す
る装置において問題となる点は、（ｉ）高温ガスによる
影響、（１０炉内のダストや地金の飛散、付着の影響に
対する対策である。(Problems to be Solved by the Invention) Problems with devices that use microwaves to measure the level of contents in a high-temperature furnace are (i) the influence of high-temperature gas, (10) This is a measure against the effects of gold scattering and adhesion.
特開昭５８−２８６５４の従来技術では内部をガス・パ
ージするジャケットと水冷構造にしたアンテナとにより
高温の影響は回避できるが、炉内のダストがアンテナ内
に投入するため不要なマイクロ波雑音が生じ、測定精度
が劣化する。In the conventional technique disclosed in JP-A-58-28654, the effects of high temperatures can be avoided by using a jacket that purges the interior with gas and an antenna with a water-cooled structure, but dust inside the furnace is thrown into the antenna, which causes unnecessary microwave noise. occurs, and measurement accuracy deteriorates.
また実開昭６０−１５２９７４の従来技術では線維層板
の通気抵抗が大きいので、冷却空気の流量を充分にとる
ころができず、温度上昇ならびにダストの付着をまぬが
れない。Furthermore, in the prior art disclosed in Japanese Utility Model Application Laid-open No. 60-152974, the ventilation resistance of the fiber laminate is large, so it is impossible to ensure a sufficient flow rate of cooling air, resulting in an increase in temperature and the adhesion of dust.
さらに両者とも、マイクロ波アンテナあるいはアンテナ
レドームが常に高温測定物体上にさらにれた状態のまま
であるので、保守性が低下する。Furthermore, in both cases, the microwave antenna or antenna radome remains suspended above the high temperature measurement object, which reduces maintainability.
（問題点を解決するための手段）
従来技術の上記問題点は、本発明においては、次の諸手
段により触決される。(Means for Solving the Problems) The above-mentioned problems of the prior art are solved by the following means in the present invention.
すなわち、マイクロ波透過性にすぐれたマイカ等の誘電
体を測定窓として筒状の測定孔の上端の水平移動可能な
測定ゲートにガス・シール状態で設はアンテナへのダス
トの侵入を遮り、誘電体板下面をガス・パージしてダス
トの付着を防ぐ。測定孔は水冷し下向ガス・パージして
炉内の高温ガスを遮り飛散するダストおよび地金の付着
を防止する。そして非測定時にはゲートをシフトさせ、
誘電体測定窓を溶湯上の測定孔位置より退避てせる。In other words, a dielectric material such as mica, which has excellent microwave transparency, is used as a measurement window and a horizontally movable measurement gate at the top of a cylindrical measurement hole is placed in a gas-sealed state to block dust from entering the antenna. Gas purge the underside of the body plate to prevent dust from adhering. The measurement hole is water-cooled and subjected to downward gas purging to block high-temperature gas in the furnace and prevent the adhesion of scattered dust and metal. Then, when not measuring, shift the gate,
The dielectric measurement window is moved away from the measurement hole position above the molten metal.
これらの諸手段を総合して、本発明のマイクロ波レベル
測定装置は構成上、高温精錬炉の上部に設けた水冷機構
を有する筒状の測定孔と、該測定孔の上端部をガス・シ
ール可能なように設けた誘電体測定窓を有する水平移動
可能な測定ゲートと、前記測定孔の上端より下方に向っ
てガス・パージする機構と、前記訪電体窓の下面をガス
・パージする機構と、前記測定ゲートの上方に設けたマ
イクロ波レーダー装置とからなることを特徴とする０
（作用）
本発明装置ハ、水冷ジャケント付筒状測定孔に測定ゲー
トを設けそれに誘電体製のマイクロ波が通過する測定窓
を付設しその下面および測定孔内を窒素ガス・パージす
る構成としたので次の詩作用が生ずる。By combining these means, the microwave level measuring device of the present invention has a cylindrical measurement hole equipped with a water cooling mechanism provided at the top of a high-temperature refining furnace, and a gas-sealed upper end of the measurement hole. a horizontally movable measurement gate having a dielectric measurement window provided as possible; a mechanism for gas purging downward from the upper end of the measurement hole; and a mechanism for gas purging the lower surface of the visiting object window. and a microwave radar device provided above the measurement gate. A measurement window is provided through which the gas passes through, and the underside of the window and the inside of the measurement hole are purged with nitrogen gas, resulting in the following effect.
＋１１ アンテナ内に侵入しようとするダストは誘電
体板で遮断され、安定な測定が可能となる。+11 Dust that attempts to enter the antenna is blocked by the dielectric plate, allowing stable measurements.
＋１１ 水冷ジャケット付筒状測定孔内の窒素ガス・
パージにより地金の付着および温度上昇を防止できる。+11 Nitrogen gas inside the cylindrical measurement hole with water cooling jacket.
Purging can prevent metal adhesion and temperature rise.
（１１１１誘電体板のガス・パージにより、ダストの付
着・を防止できる。(Dust adhesion can be prevented by gas purging of the 1111 dielectric plate.
脂 測定時以外は、ゲートを閉じるので、保全性に優れ
る。Since the gate is closed except when measuring oil, it is highly maintainable.
（実施例）
第１および２図は、転炉内の溶銑および炉床レベルを測
定する本発明のマイクロ波レベル測定装置の実施例を示
す。転炉上のＯＧフード（１）には溶銑に向って開口す
る水冷ジャケント付の筒状測定孔（２）が設けられてお
シ、冷却水は入口（３）および出口（４）を通ってジャ
ケット内に流れる０その上部には窒素ガスを下向に吹込
むパージ・スリット（５）がある。測定孔（２）の上端
部には、エヤーシリンダ（６）に連結されて水平移動可
能な測定ゲート（７）が設けられている。測定ゲート（
７）には測定孔とある位置で一致する誘電体測定窓（８
）が設けられており、誘電体板（９）はスライドプレー
トαＯによりガス会シールして取付けられ、その下面に
窒素ガスを吹込むパージ・ノズル回が窓の下方に設けら
れている。＠はアンテナ、頭はブイクロ波回路で、カバ
ーＱ４Ｊで覆われている０マイクロ波回路ｃ３は外部の
信号処理回路ｑ！９と接続され、さらにゲート制御盤ａ
・に接続される。(Embodiment) Figures 1 and 2 show an embodiment of the microwave level measuring device of the present invention for measuring the level of hot metal and hearth in a converter. The OG hood (1) above the converter is equipped with a cylindrical measuring hole (2) with a water cooling jacket that opens toward the hot metal, and the cooling water passes through the inlet (3) and outlet (4). There is a purge slit (5) at the top of the jacket that blows nitrogen gas downward. A horizontally movable measurement gate (7) connected to an air cylinder (6) is provided at the upper end of the measurement hole (2). Measuring gate (
7) has a dielectric measurement window (8) that coincides with the measurement hole at a certain position.
), the dielectric plate (9) is attached with a gas seal by a slide plate αO, and a purge nozzle for blowing nitrogen gas is provided on the lower surface of the dielectric plate (9) below the window. @ is the antenna, the head is the microwave circuit, and the microwave circuit c3 covered by the cover Q4J is the external signal processing circuit q! 9 and further connected to gate control panel a
・Connected to.
測定窓の誘電体としてはマイカを用いる。材質は５００
℃以上の耐熱性、不燃の耐熱性、吸水率０．４％の耐水
性に優れた積層マイカ板がよい。Mica is used as the dielectric material of the measurement window. The material is 500
A laminated mica board is preferable because it has excellent heat resistance above °C, non-combustible heat resistance, and water resistance with a water absorption rate of 0.4%.
誘電率は５以下（２４ＧＨｚ ）でありマイクロ波透過
性にすぐれている。また機械的に割れにくく、取扱いが
容易である。It has a dielectric constant of 5 or less (24 GHz) and has excellent microwave transparency. It is also mechanically hard to break and easy to handle.
測定孔（２）は水冷および窒素ガス・パージにより炉内
の高温ガスおよび飛散する地金の付着が防止される。マ
イ力板測定窓てより炉内の細かいダストがアンテナに侵
入することは防止される。マイ力板下面はガスやパージ
によりダスト付着が防止され、マイクロ波の不要の反射
波の発生が防止されるσマイクロ波レベル計の信号処理
回路ａυはゲート制御盤αＱよりゲートの開閉信号を入
力し、ゲートが開いている時に炉内のレベル測定を行う
。測定時以外はマイカ板を退避させるので保全性にすぐ
れている。The measurement hole (2) is water-cooled and nitrogen gas purged to prevent the attachment of high-temperature gas in the furnace and scattered metal. The power plate measurement window prevents fine dust inside the furnace from entering the antenna. Gas and purge prevent dust from adhering to the bottom surface of the power plate, preventing the generation of unnecessary microwave reflected waves.σ The signal processing circuit aυ of the microwave level meter inputs the gate opening/closing signal from the gate control panel αQ. Then, measure the level inside the furnace when the gate is open. Since the mica plate is retracted except during measurement, it has excellent maintainability.
第３図は溶銑レベルの測定結果を示す。レベル計の測定
時間を０．１秒とし、１０秒間連続測定した時の演１１
定値の標準偏差はσ＝ ６０１１でちシ、サブランス法
の測定精度σ＝７０ｍを上回る結果が得られた。この標
準偏差には底吹き攪拌による湯面レベルの変動分も含ま
れていることを考えると充分な精度といえる。Figure 3 shows the measurement results of the hot metal level. Performance 11 when the measurement time of the level meter is 0.1 seconds and continuous measurement is made for 10 seconds.
The standard deviation of the constant value was σ = 6011, which exceeded the measurement accuracy of the sublance method, σ = 70 m. This standard deviation can be said to be sufficiently accurate considering that it also includes fluctuations in the melt level due to bottom-blown stirring.
第４図は１炉代を通じて本発明装置により湯面レベルを
測定した時の結果を従来のサブランス法と比較して示す
。本発明により精度のよい湯面測定が可能となることが
わかる。FIG. 4 shows the results of measuring the molten metal level using the apparatus of the present invention throughout one furnace period in comparison with the conventional sublance method. It can be seen that the present invention makes it possible to measure the hot water level with high accuracy.
また本発明レベル計は炉底レベル測定にも適用が可能で
ある。The level meter of the present invention can also be applied to hearth bottom level measurement.
第５図は排滓後の炉底レベルの測定結果を示す。標準偏
差はσ＝４−で安定した結果が得られておシ、簡便で精
度のよい炉底管理が可能である。 ｒ
（発明の効果）
上下吹き転炉の湯面および炉底レベル測定に本発明装置
を適用することにより、精度のよい測定を行うことが可
能となり、吹錬の安定化、精度のよい炉底管理に寄与す
ることができる。Figure 5 shows the measurement results at the bottom level of the furnace after slag was discharged. Stable results are obtained with a standard deviation of σ = 4-, and simple and accurate hearth bottom management is possible. (Effects of the invention) By applying the device of the present invention to the measurement of the melt level and bottom level of a top-bottom blowing converter, it becomes possible to perform accurate measurements, stabilize blowing, and measure the bottom of the furnace with high precision. Can contribute to management.
また保守性がすぐれている。It also has excellent maintainability.
第１図は本発明のマイクロ波レベル測定装置の実施例の
縦断細面および制御系統図、第２図はその横断平面図、
第５図は横軸に時間０秒）゛縦軸にレベル−をとった溶
銑レベルの測定結果を示す図表、第４図は横軸にビート
回数、縦軸にレベルをとり本発明装置とサブランス法の
測定結果を比較した図表、第５図は横軸に時間（秒）縦
軸レベル−をとり炉底レベルの測定結果を示す図表、第
６図は従来技術の１例の縦断側面および制御系統図、第
７図は従来技術の他側の縦断側面図である。
（１）・・ＯＧフード、・（２）・φ筒状測定孔、（３
）・・冷却水入口、（４）・−冷却水出口、（５）・・
パージ９スリツ） 、（６） ＠・エヤーシリンダ、ｔ
７）・・測定ゲート、（８）・・誘電体測定窓、（９）
・・誘電体板、α０・Φスライドプレート、ｃＬυ・・
パージ・ノスル、（２）・・アンテナ、Ｑ・・マイクロ
波回路、（ＩＱ・・カバー、α均・・信号処理回路、ｑ
Ｑ・・ゲート制御盤、（ａ）・書溶銑、（ｂ）１１１１
スラグ、（ｃ）−・転炉、ｆｄ）・・ＯＧフード、（ｅ
）φ・ジャケット、（ｆ）・やマイクロ波アンテナ、（
ｇ）・・マイクロ波発生回路、（ｈｌ−・信号処理回路
、（ｉ）８・マイクロ波回路、＋ｊ＋−・ダスト遮へい
板、（ωΦ・冷却空気、（１１・・高温ガス。
１．１１図
ム−２Ｇ′：
ｊど→ 表
一ン−−と女（FIG. 1 is a vertical cross-sectional view and control system diagram of an embodiment of the microwave level measuring device of the present invention, and FIG. 2 is a cross-sectional plan view thereof.
Figure 5 is a chart showing the measurement results of the molten metal level with the horizontal axis representing time 0 seconds) and the vertical axis representing the level. Fig. 5 is a chart showing the measurement results at the bottom level with time (seconds) on the horizontal axis and level on the vertical axis, and Fig. 6 is a longitudinal cross-sectional view of an example of conventional technology and control. The system diagram, FIG. 7, is a vertical sectional side view of the other side of the prior art. (1)・・OG hood,・(2)・φ cylindrical measurement hole, (3
)... Cooling water inlet, (4) - Cooling water outlet, (5)...
Purge 9 slots), (6) @ air cylinder, t
7)...Measurement gate, (8)...Dielectric measurement window, (9)
・・Dielectric plate, α0・Φ slide plate, cLυ・・
Purge nostle, (2)...antenna, Q...microwave circuit, (IQ...cover, alpha uniformity...signal processing circuit, q
Q...Gate control panel, (a), hot iron, (b) 1111
Slag, (c)-・Converter, fd)・OG hood, (e
)φ・Jacket, (f)・Microwave antenna, (
g)...Microwave generation circuit, (hl-・Signal processing circuit, (i)8・Microwave circuit, +j+-・Dust shielding plate, (ωΦ・Cooling air, (11・・High temperature gas. 1.11 Figure Mu-2G': jdo → Table 1-- and woman (
Claims (2)
の測定孔と該測定孔の上端部にガス・シール可能なよう
に設けた誘電体測定窓を有する水平移動可能な測定ゲー
トと、前記測定孔の上端より下方に向つてガス・パージ
する機構と、前記誘電体窓の下面をガス・パージする機
構と、前記測定ゲートの上位に設けたマイクロ波レーダ
ー装置とからなることを特徴とするマイクロ波レベル測
定装置。(1) A cylindrical measurement hole with a water cooling mechanism installed in the upper part of the high-temperature refining furnace, and a horizontally movable measurement gate with a dielectric measurement window installed in the upper end of the measurement hole so as to be gas-sealable. , comprising a mechanism for gas purging downward from the upper end of the measurement hole, a mechanism for gas purging the lower surface of the dielectric window, and a microwave radar device provided above the measurement gate. Microwave level measuring device.
する特許請求の範囲第１項記載のマイクロ波レベル測定
装置。(2) The microwave level measuring device according to claim 1, wherein a mica plate is used as a window material for the dielectric measurement window.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61246824A JPS63100331A (en) | 1986-10-16 | 1986-10-16 | Microwave level measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61246824A JPS63100331A (en) | 1986-10-16 | 1986-10-16 | Microwave level measuring instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63100331A true JPS63100331A (en) | 1988-05-02 |
| JPH0481734B2 JPH0481734B2 (en) | 1992-12-24 |
Family
ID=17154238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61246824A Granted JPS63100331A (en) | 1986-10-16 | 1986-10-16 | Microwave level measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63100331A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020050830A (en) * | 2000-12-22 | 2002-06-28 | 신현준 | Microwave level measurement apparatus and method for Blaster Furnace |
| WO2003048697A1 (en) * | 2001-12-05 | 2003-06-12 | Saab Marine Electronics Ab | Radar antenna |
| WO2006048979A1 (en) * | 2004-11-08 | 2006-05-11 | Nireco Corporation | Method and device for measuring width direction end position of stripe body, and method and device for measuring width direction central position of stripe body |
| JP2012107304A (en) * | 2010-11-19 | 2012-06-07 | Sumitomo Metal Ind Ltd | Converter blowing method |
| JP2014134447A (en) * | 2013-01-10 | 2014-07-24 | Nippon Steel & Sumitomo Metal | Microwave distance measurement apparatus |
| JP2014196992A (en) * | 2012-11-12 | 2014-10-16 | 株式会社ワイヤーデバイス | Apparatus for detecting surface of substance loaded in blast furnace |
-
1986
- 1986-10-16 JP JP61246824A patent/JPS63100331A/en active Granted
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020050830A (en) * | 2000-12-22 | 2002-06-28 | 신현준 | Microwave level measurement apparatus and method for Blaster Furnace |
| WO2003048697A1 (en) * | 2001-12-05 | 2003-06-12 | Saab Marine Electronics Ab | Radar antenna |
| US6684697B1 (en) | 2001-12-05 | 2004-02-03 | Saab Marine Electronics Ab | Radar antenna |
| WO2006048979A1 (en) * | 2004-11-08 | 2006-05-11 | Nireco Corporation | Method and device for measuring width direction end position of stripe body, and method and device for measuring width direction central position of stripe body |
| US7659729B2 (en) | 2004-11-08 | 2010-02-09 | Nireco Corporation | Method and device for measuring width direction end position of stripe body, and method and device for measuring width direction center position of stripe body |
| JP2012107304A (en) * | 2010-11-19 | 2012-06-07 | Sumitomo Metal Ind Ltd | Converter blowing method |
| JP2014196992A (en) * | 2012-11-12 | 2014-10-16 | 株式会社ワイヤーデバイス | Apparatus for detecting surface of substance loaded in blast furnace |
| JP2014134447A (en) * | 2013-01-10 | 2014-07-24 | Nippon Steel & Sumitomo Metal | Microwave distance measurement apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0481734B2 (en) | 1992-12-24 |
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