JPS6154416A - Flame light detecting device - Google Patents
Flame light detecting deviceInfo
- Publication number
- JPS6154416A JPS6154416A JP59177323A JP17732384A JPS6154416A JP S6154416 A JPS6154416 A JP S6154416A JP 59177323 A JP59177323 A JP 59177323A JP 17732384 A JP17732384 A JP 17732384A JP S6154416 A JPS6154416 A JP S6154416A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- flame light
- casing
- flame
- quartz
- 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
- 239000013307 optical fiber Substances 0.000 claims abstract description 101
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 84
- 238000002485 combustion reaction Methods 0.000 claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 29
- 239000010453 quartz Substances 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims description 35
- 239000002184 metal Substances 0.000 claims description 35
- 239000000377 silicon dioxide Substances 0.000 claims description 25
- 239000000835 fiber Substances 0.000 claims description 13
- 238000005253 cladding Methods 0.000 claims description 9
- 230000000644 propagated effect Effects 0.000 claims description 3
- 239000012212 insulator Substances 0.000 description 21
- 238000005304 joining Methods 0.000 description 9
- 239000000919 ceramic Substances 0.000 description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005219 brazing Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 210000005252 bulbus oculi Anatomy 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 239000003923 scrap metal Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0014—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation from gases, flames
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0014—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation from gases, flames
- G01J5/0018—Flames, plasma or welding
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0044—Furnaces, ovens, kilns
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/04—Casings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/04—Casings
- G01J5/048—Protective parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0818—Waveguides
- G01J5/0821—Optical fibres
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
Description
【発明の詳細な説明】 〔発明の利用分野〕 本発明は火炎光検出装置に関するものである。[Detailed description of the invention] [Field of application of the invention] The present invention relates to a flame light detection device.
ボイラ、石油ストーブ、火花点火式または圧縮着火式内
燃機関等の最適燃焼を常に好適に維持するには燃焼温度
、圧力、空燃比、点火時期、噴射時期等を最適に制御す
る必要があるのみならず、内燃機関においてはノックが
生じない限界付近で運転することが出力、経済性の点か
ら有利である。In order to maintain optimal combustion in boilers, kerosene stoves, spark ignition type or compression ignition type internal combustion engines, etc., it is necessary to optimally control combustion temperature, pressure, air-fuel ratio, ignition timing, injection timing, etc. First, in terms of output and economy, it is advantageous for internal combustion engines to operate near the limit where knocking does not occur.
これらの諸パラメータのいずれかを検出して閉ループ制
御することがこれまでに多数公開されてお杓、特に燃焼
火炎光により燃焼の物理的過程を検出するための火炎光
検出装置が提案されている。Many studies have been published to date on detecting any of these parameters for closed-loop control, and in particular, flame light detection devices have been proposed for detecting the physical process of combustion using combustion flame light. .
例えば特開昭５７−１０８７３４号および特開昭５７−
１０８７３５号では、ねじケーシング内の燃焼室側罠石
英ガラス律、他方端側に光ファイバを配して火炎光を検
出するようにしている。このような場合に火炎光を十分
に光ファイバに導くために、石英ガラス棒の断面状を大
きくとる必要があり、コストが高くなると共に、装置の
コンパクト化が難しい。また、燃焼室側の高温部に金属
部と石英ガラス部とが密着された形で配置されるので、
両者の熱膨張率が大きく異なり、耐熱性の観点からも好
ましくない。For example, JP-A-57-108734 and JP-A-57-
In No. 108735, a quartz glass trap is placed on the side of the combustion chamber in the screw casing, and an optical fiber is arranged on the other end side to detect flame light. In such a case, in order to sufficiently guide the flame light to the optical fiber, it is necessary to have a large cross section of the quartz glass rod, which increases the cost and makes it difficult to make the device compact. In addition, since the metal part and the quartz glass part are placed in close contact with each other in the high temperature part on the combustion chamber side,
The thermal expansion coefficients of the two are significantly different, which is not preferable from the viewpoint of heat resistance.
また特開昭５７−１６３８４２号では上述の検出装置の
石英ガラス棒の軸心部に中心電極を挿入し、ねじクーソ
ング部を対地電極として点火プラグの機能をかねた装置
が提案されている。しかしこの装置も火炎導入部の構成
は前述のそれとほぼ同様で、前述のそれと同様な欠点を
有している。Furthermore, Japanese Patent Laid-Open No. 57-163842 proposes a device in which a center electrode is inserted into the axial center of the quartz glass rod of the above-mentioned detection device, and the threaded coupling portion is used as a ground electrode to function as a spark plug. However, this device also has the same structure of the flame introduction section as the above-mentioned one, and has the same drawbacks as the above-mentioned one.
本発明は以上の点に鑑みなされたものであり、コンパク
トで耐熱性、気密性の向上を可能とした火炎光導入部を
有する火炎光検出装置を提供することを目的とするもの
である。The present invention has been made in view of the above points, and it is an object of the present invention to provide a flame light detection device having a flame light introduction section that is compact and capable of improving heat resistance and airtightness.
すなわち本発明は燃焼型内の燃焼火炎光を検出する装置
が、ねじケーシングおよびこのねじケーシング内に配設
され、前記火炎光を入射・伝播する少なくとも一つの光
導体を有する火炎光導入部と、前記光導体に接続され、
かつ前記ねじケーシングの外部に配設されたねじケーシ
ング外光ファイバおよびこの光ファイバに接続され、前
記入射・伝播した火炎光を光電変換する光電変換部を有
する火炎光検出部とを備えているものにおいて、前記光
導体を、その外周が金属パイプで覆われ、かつコアおよ
びクラッドが石英の石英系光ファイバと、この石英系光
ファイバの出力端に接続された多成分系光ファイバとで
形成すると共に、前記石英系光ファイバの入力端を前記
ねじケーシングから前記燃焼室側へ突出させたことを特
徴とするものであり、これによって光導体は金属パイプ
で覆われた石英系光ファイバと多成分系光ファイバとで
形成され、かつ石英系光ファイバの入力端はねじケーシ
ングから燃焼室側へ突出させられるようになる。That is, the present invention provides a device for detecting combustion flame light in a combustion mold, comprising a screw casing and a flame light introducing section disposed within the screw casing and having at least one light guide through which the flame light enters and propagates; connected to the light guide;
and a screw casing external optical fiber disposed outside the screw casing, and a flame light detection section connected to this optical fiber and having a photoelectric conversion section that photoelectrically converts the incident and propagated flame light. In this method, the optical guide is formed of a silica-based optical fiber whose outer periphery is covered with a metal pipe and whose core and cladding are quartz, and a multi-component optical fiber connected to the output end of the silica-based optical fiber. In addition, the input end of the silica-based optical fiber is made to protrude from the screw casing toward the combustion chamber, so that the light guide is composed of a quartz-based optical fiber covered with a metal pipe and a multicomponent. The input end of the silica optical fiber is made to protrude from the screw casing toward the combustion chamber.
以下、図示した実施例に基づいて本発明を説明する。第
１図から第６図には本発明の一実施例が示されている。The present invention will be explained below based on the illustrated embodiments. An embodiment of the present invention is shown in FIGS. 1-6.
このうち第１図に示されているように燃焼室（図示せず
）内の燃焼火炎光を検出する装置は、ねじケーシング１
およびこのねじケーシング１内に配設され、火炎光を入
射・伝播する少なくとも一つの光導体２を有する火炎光
導入部３と、光導体２に接続され、かつねじケーシング
１の外部に配設されたねじケーシング外光ファイバ４お
よびこの光ファイバ４に接続され、入射・伝播した火炎
光を光電変換する光電変換部５を有する火炎光検出部６
とを備えている。なお同図において５ａ、５ｂは光電変
換部５を構成するもので５８は光電変換素子、５ｂは信
号処理回路で心り、７は接続コネクタである。このよう
に構成された火炎光検出装置で本実施例では第２図から
第４図にも示されているように光導体２を、その外周が
金属パイプ８で覆われ、かつコア２Ｃおよびクラッド２
ｄが石英の石英系光ファイバ２ａと、この石英系光ファ
イバ２ａの出力端に接続された多成分系光ファイバ２ｂ
とで形成すると共に、石英系光ファイバ２ａの入力端を
ねじケーシング１から燃焼室側へ突出させた。このよう
にすることにより光導体２は金属パイプ８で覆われた石
英、系光ファイバ２ａと多成分系光ファイバ２ｂとで形
成され、かつ石英系光ファイバ２ａの入力端は７スじケ
ーシングｌから燃焼室側へ突出するようにンｉって、コ
ンパクトで耐熱性、気密性の向上を可能とした火炎導入
部３を有する火炎光検出装置を得ると七ができる。Of these, as shown in FIG.
and a flame light introduction part 3 disposed inside the screw casing 1 and having at least one light guide 2 through which flame light enters and propagates; a flame light detection unit 6 having a screw casing external optical fiber 4 and a photoelectric conversion unit 5 connected to the optical fiber 4 and photoelectrically converting incident and propagated flame light;
It is equipped with In the figure, 5a and 5b constitute the photoelectric conversion section 5, 58 is a photoelectric conversion element, 5b is a signal processing circuit, and 7 is a connector. In this embodiment of the flame light detection device configured as described above, as shown in FIGS. 2 to 4, the light guide 2 is covered with a metal pipe 8 on its outer periphery, and is covered with a core 2C and a cladding. 2
A quartz-based optical fiber 2a in which d is quartz, and a multi-component optical fiber 2b connected to the output end of this silica-based optical fiber 2a.
At the same time, the input end of the silica-based optical fiber 2a was made to protrude from the screw casing 1 toward the combustion chamber side. By doing so, the light guide 2 is formed of a quartz optical fiber 2a covered with a metal pipe 8 and a multi-component optical fiber 2b, and the input end of the quartz optical fiber 2a is connected to a 7-strip casing l. 7 can be obtained by obtaining a flame light detection device having a flame introduction portion 3 which is compact and has improved heat resistance and airtightness by projecting toward the combustion chamber side.
ねじ
すなわち、ケーシングｌは締め付は用の六角ナツト部１
ａ、燃焼室への取り付は用ねじｍｌ ｂ、ねじケーンン
グ外光ファイバ４を接続する接続コネクタ用ねじ部ＩＣ
を持って構成しである。このねじケーシングｌの内部に
は、その中心軸上に石英系光ファイバ２ａ（φ１ｍｍ程
度）を配設し、そしてその外周を比較的熱膨張の小さい
金属（例えばＦ、Ｎ＋にＣ０を混ぜた合金）のパイプ８
でが一ドし、さらにその外周をセラミックスのような耐
熱性にすぐれた絶縁体９で覆うようにた。この石英系光
ファイバ２ａの入力端は燃焼室内に開口し、他端の出力
端は接合用金属体１０を介して多成分系光ファイバ２ｂ
と接合した。このようにすることにより火炎光導入部３
をコンパクトで耐熱性、気密性にすぐれたものとするこ
とができるが、それを次に述べる。The screw, that is, the casing l is the hexagonal nut part 1 for tightening.
a. Thread ml for installation in the combustion chamber b. Screw caning Threaded part IC for connecting connector to connect external optical fiber 4
It is composed of Inside this screw casing l, a silica-based optical fiber 2a (about 1 mm diameter) is arranged on its central axis, and its outer periphery is made of a metal with relatively low thermal expansion (for example, an alloy of F, N+ mixed with C0). ) pipe 8
However, the outer periphery is further covered with an insulator 9 having excellent heat resistance such as ceramics. The input end of this silica-based optical fiber 2a opens into the combustion chamber, and the output end of the other end is connected to the multi-component optical fiber 2b via the joining metal body 10.
It was joined with By doing this, the flame light introducing section 3
can be made compact, heat resistant, and airtight, which will be described next.
この種火炎光検出装置の火炎光導入部３において特に留
意すべきことは燃焼室内の圧力を漏洩させないこと、す
なわち気密性の高いことである。Particular attention should be paid to the flame light introduction section 3 of this type of flame light detection device to prevent the pressure inside the combustion chamber from leaking, that is, to ensure high airtightness.
それは火花点火式機関では燃焼時に１０から２０Ｋｙ
／ ｃＭ 、圧縮着火式機関では１００から１５０Ｋｐ
／ ｃｒＡ程度の高圧となるからである。また燃焼室内
の高温度雰囲気と外気（低温）との急激な温朋勾配雰囲
気における熱的な破壊を防ぐ必要がある。In a spark ignition engine, it is 10 to 20 Ky during combustion.
/ cM, 100 to 150 Kp for compression ignition engines
This is because the pressure is as high as / crA. It is also necessary to prevent thermal breakdown in an atmosphere with a sharp temperature gradient between the high temperature atmosphere inside the combustion chamber and the outside air (low temperature).
それは燃焼時のガス温度は瞬間的に２０００から２５０
０Ｃａ度の高温となるからである。従って燃焼ガスが触
れる個所は十分に融点の旨い材料を用いる必要がある。The gas temperature during combustion is instantaneously between 2000 and 250.
This is because the temperature is as high as 0 Ca degrees. Therefore, it is necessary to use a material with a sufficiently high melting point for the parts that come into contact with the combustion gas.
石英ガラスの融点が１７６０Ｃ１セラミツクスの融点が
２０００Ｃ程度であるが、従来の一般的な点火プラグの
温度分布は中心電極部で５００から７００ｔｌｌ’、対
地電極部で２５０から３５０Ｃ程度でおるので、その熱
容量、放熱性から７００Ｃ以下の温度条件下となシ、石
英ガラスおよびセラミックスは十分に耐えることができ
る。なお点火プラグに言及したのは、火炎光検出装誼の
火炎光導入部３は点火プラグに内蔵させてエンジンの燃
焼室に取シ付けるのが、最も製品となり易くコンパクト
化の上からも望ましいことで・５るからである。The melting point of quartz glass is 1760C, and the melting point of ceramics is about 2000C, but the temperature distribution of conventional general spark plugs is about 500 to 700 tll' at the center electrode and about 250 to 350C at the ground electrode, so its heat capacity is Due to their heat dissipation properties, quartz glass and ceramics can withstand temperatures below 700C. The reason for mentioning the spark plug is that it is preferable for the flame light introduction part 3 of the flame light detection device to be built into the spark plug and installed in the combustion chamber of the engine because it is the easiest product to manufacture and from the standpoint of compactness. This is because it is 5 times.
まず、気密性の確保について説明する。第２図。First, ensuring airtightness will be explained. Figure 2.
第４図および第６図にも示されているようにねじケーシ
ング１とセラミックスの絶縁体９とは、絶縁体９の外周
の接合部Ａにおる種の金属（Ｍ、−Ｍ、）を溶着（メタ
ライズ）シ、この部分とねじケーシング１の内周面とを
銀ろう付けして接合する。金属パイプ８と絶縁体９とは
、絶縁体９の内周面の接合部Ｂをメタライズし、この部
分と金属パイプ８とを銀ろう付けして接合する。そして
石英系光ファイバ２ａと金属パイプ８とは直接接合する
ことが困難なので、接合用金属体ｌＯを介して行なった
。すなわち接合用金属体１０と金属パイプ８とを図示の
接合部Ｃで銀ろう付けし、接合用金属体１０の他端に設
けた多成分系光ファイバ２ｂと接合用金属体１０とを図
示の接合部りでガラス封止する。そして石英系光ファイ
バ２ａの後端２ｅを金属パイプ８の外径と同程度に大き
くしてＸ方向への抜けを防止するようにした。このよう
にすることにより燃焼室と大気との間は十分よくじゃ閉
されるようになって、火炎光尋人部３の高気密性を確保
することができる。すなわち石英系光ファイバ２ａと金
属パイプ８との間に流入するガスおよび燃焼圧は接合部
Ｃ，Ｄでしゃ断される。As shown in FIGS. 4 and 6, the screw casing 1 and the ceramic insulator 9 are welded with metals (M, -M,) at the joint A on the outer periphery of the insulator 9. (Metallization) This part and the inner peripheral surface of the screw casing 1 are joined by silver brazing. The metal pipe 8 and the insulator 9 are joined by metallizing the joint part B on the inner circumferential surface of the insulator 9, and silver brazing this part to the metal pipe 8. Since it is difficult to directly join the silica-based optical fiber 2a and the metal pipe 8, this was done through a joining metal body IO. That is, the joining metal body 10 and the metal pipe 8 are silver-brazed at the illustrated joint C, and the multi-component optical fiber 2b provided at the other end of the joining metal body 10 is connected to the joining metal body 10 as shown in the figure. The joint is sealed with glass. The rear end 2e of the silica-based optical fiber 2a is made as large as the outer diameter of the metal pipe 8 to prevent it from coming off in the X direction. By doing so, the combustion chamber and the atmosphere are sufficiently closed off, and high airtightness of the flame light passenger section 3 can be ensured. That is, the gas and combustion pressure flowing between the silica-based optical fiber 2a and the metal pipe 8 are cut off at the junctions C and D.
次いで耐熱性の確保であるが、側熱性については上述の
ように耐熱性材料を使用するのみならず、次に述べるよ
うにして対処した。ねじケーシングｌと絶縁体９との接
合部Ａ１絶縁体９と金属パイプ８との接合部Ｂを同図記
載のように局所的に形成し、ケーシング１、絶縁体９お
よび金回バイブ８間には接合部Ａ、Ｂを除いて僅かな隙
間を設けるようにした。これによってこの夫々の部材の
軸方向および径方向は共に自由端となり、夫々の部材の
熱膨張の違いによる伸びを逃がすことができムコンパク
ト化については石英系光ファイバ２ａの入力端を第４図
にも示されているように燃焼室側へ突出させ、かつこの
石英系光ファイバ２ａと多成分系光ファイバとで火炎光
を十分よく入射・伝播させるようセしたので、従来の石
英カラス棒のようにその断面積を大きくとる必要がなく
なり、コンパクト化が可能となった。すなわち石英系光
ファイバ２ａはコア２Ｃ、クラッド２ｄ共に石英で形成
しく但しクラッド２ｄのそれはある種の添加削を入れて
コア２０部の屈折率ｎ１に対してクラツド２ｄ部の屈折
率ｎ２がｎｌ）ｎ２となるように（７１５成しである）
、その直径比が約９／ｌＯのように＋１・Ｉ成しである
。この石英系光ファイバ２ａの）、・１ｊ÷焼呈側の入
力端（開口端）を同図記載のように所定の半径孔で広角
レンズを形成することが、視野を大さくする上では望ま
しい。しかし加工性、測定対象等によっては第５図にも
示されているように種々の形状を任意に選択できるよう
にした。Next, with regard to ensuring heat resistance, we not only used heat resistant materials as described above, but also took measures as described below. A joint part A between the screw casing l and the insulator 9, a joint part B between the insulator 9 and the metal pipe 8 are formed locally as shown in the figure, and a joint part A between the screw casing l and the insulator 9 and a joint part B between the insulator 9 and the metal pipe 8 are formed between the casing 1, the insulator 9 and the metal pipe 8. A slight gap was provided except for joints A and B. As a result, both the axial and radial directions of each member become free ends, and elongation due to differences in thermal expansion of each member can be released.For compactness, the input end of the silica optical fiber 2a is shown in Fig. 4. As shown in Figure 2, the quartz glass rod protrudes toward the combustion chamber side, and the quartz fiber 2a and the multi-component optical fiber are designed to allow the flame light to enter and propagate sufficiently. This eliminates the need for a large cross-sectional area, making it possible to make it more compact. In other words, in the quartz-based optical fiber 2a, both the core 2C and the cladding 2d are made of quartz. However, the cladding 2d has been subjected to some additional cutting so that the refractive index n2 of the cladding 2d part is nl compared to the refractive index n1 of the core 20 part. So that it is n2 (715 completed)
, the diameter ratio is approximately +1·I, such as approximately 9/lO. In order to enlarge the field of view, it is desirable to form a wide-angle lens at the input end (opening end) of this silica-based optical fiber 2a on the burning side with a predetermined radius hole as shown in the figure. . However, depending on the workability, the object to be measured, etc., various shapes can be arbitrarily selected as shown in FIG.
同図の（ａ）は最も加工し易い形状で、金属パイプ８と
石英系光ファイバ２ａとは同一断面で切断しである。従
ってその視野は第５図に記載のもののうちでは最も小さ
いので、局所的な火炎光を導入・伝播するのに適してい
る。同図（ｂ）は石英系光ファイバ２ａを金属バイブ８
より僅かに突出ぜせ、端面は匣角に切断したものである
。視野は（ａ）とほぼ同様であるが、この（ｂ）の突出
させた部分のクラッド２ｄを剥離して、同図（Ｃ）のよ
うにクラツド２ｄ部と金属パイプ８部とを同一面にすれ
ば、視野は（ｂ）のそれに比べて大幅に向上する。同図
（ｄ）は石英不光ファイバ２ａの端面を半球状に、同図
（ｅ）は円すい状に形成したものである。The shape shown in (a) in the figure is the easiest to process, and the metal pipe 8 and the quartz optical fiber 2a are cut at the same cross section. Therefore, its field of view is the smallest among those shown in FIG. 5, making it suitable for introducing and propagating localized flame light. In the same figure (b), a quartz optical fiber 2a is connected to a metal vibrator 8.
It protrudes slightly more, and the end face is cut into a square shape. The field of view is almost the same as in (a), but by peeling off the cladding 2d at the protruding part in (b), the cladding 2d and the metal pipe 8 are placed on the same surface as shown in (C). Then, the field of view will be greatly improved compared to that in (b). The end face of the quartz non-optic fiber 2a is formed into a hemispherical shape in FIG. 2(d), and into a conical shape in FIG.
第６図には光導体２の集光状態が示されているが、同図
にも示されているように多成分系光ファイバ２ｂにＸｌ
からＸｌの距離間に図中矢印表示の火炎光Ｑを集光させ
るレンズ機能を持たせるようにした。このようにするこ
とによ＃）Ｘｌすなわち多成分系光ファイバ２ｂの後端
のねじケーシング外光ファイバは、上述の第１図にも示
されているように一般の通信用の光ファイバケーブル４
ａ（φ５０からφ１２５μｍ）を用いることができ、こ
の光ファイバケーブル４ａで強力な火炎光を伝送し、検
出する火炎光検出装置が構成できる。すなわち第１図に
も示されているように光ファイバケーブル４ａは燃焼室
周辺の電気的、温匪的および機械的な苛酷な環境下よシ
隔てられた場所で光電変換するが、内燃機関の場合に代
光する１つの気筒あるいは各々の気筒からの燃焼火炎光
が光ファイバケーブル４ａの光ファイバ４ｂ、４ｃ、４
ｄ。FIG. 6 shows the condensing state of the light guide 2, and as also shown in the figure, the multi-component optical fiber 2b is
A lens function is provided to condense the flame light Q shown by the arrow in the figure between the distance from Xl to Xl. By doing this, the optical fiber outside the screw casing at the rear end of the multi-component optical fiber 2b is converted into a general communication optical fiber cable 4, as shown in FIG.
a (φ50 to φ125 μm) can be used to construct a flame light detection device that transmits and detects strong flame light using this optical fiber cable 4a. In other words, as shown in FIG. 1, the optical fiber cable 4a performs photoelectric conversion in a location separated from the harsh electrical, thermal, and mechanical environments around the combustion chamber, but in the internal combustion engine. In this case, the combustion flame light from one cylinder or each cylinder is transmitted to the optical fibers 4b, 4c, 4 of the optical fiber cable 4a.
d.
４ｅで束状に集められ、この端部に接続された光電変換
素子５ａ（例えばフォトトランジスタ、フォトダイオー
ド、ＰＩＮフォトダイオード）で電気量に変換される。The light is collected into a bundle at 4e and converted into an electric quantity by a photoelectric conversion element 5a (for example, a phototransistor, a photodiode, or a PIN photodiode) connected to this end.
光電変換素子５ａの出力信号は信号処理回路５ｂに送ら
れ、所要の信号処理が行なわれ、目的の検出パラメータ
を出力する。従ってこのように火炎光検出装置を構成す
ることによシ上述のようにコンパクトで耐熱性、気密性
の向上を可能とした火炎光導入部３が得られるのみなら
ず、火花点火式機関で問題となる電磁ノイズ、内燃機関
一般で生ずる機械的振動ノイズ等の影響をなくした火炎
信号が検出できる。The output signal of the photoelectric conversion element 5a is sent to the signal processing circuit 5b, where necessary signal processing is performed and the target detection parameter is output. Therefore, by configuring the flame light detection device in this way, it is possible to not only obtain the flame light introduction section 3 which is compact and has improved heat resistance and airtightness as described above, but also solves problems in spark ignition engines. It is possible to detect flame signals that are free from the effects of electromagnetic noise, mechanical vibration noise, etc. that occur in general internal combustion engines.
第７図から第９図には本発明の他の実施例、が示されて
いる。本実施例では火炎光検出装置をねじケーシング外
光ファイバ４にバンド・ファイバ４ｆを使用して構成し
た。このようにすることにニジ複数個の光電変換素子５
ａｌ 、５ａ２と結合できるようになって、前述の場合
に比べ複数個の情報を同時に検出することができる。す
なわちコア２ ｃ／およびクラッド２ ｄ ／を有する
多成分系光ファイバ２ｂ′を、図中矢印表示のようにＸ
ｌに入射した火炎光Ｑの平行光はＸｌで出射するときも
平行光となるようにし、このような機能を持たせた多成
分系光ファイバ２ｂ′の後端はハンドル・ファイバ４ｆ
で構成した。ハンドル・ファイバ４ｆは外被１１の内部
に多数本の光ファイバ４ｇが束ねられて収納されている
。このハンドル・ファイバ４ｆを火炎光導入部３に設け
た接続コネクタ７ａを介して多成分系光ファイバ２ ｂ
／に接続する。そしてハンドル・ファイバ４ｆの束ね
られた光ファイバ４ｇを数本ずつよシわけて分岐部１２
を形成し、分岐した光ファイバを検出特性の異なる複数
個の光電変換素子５ａｌ 、５ａ２と結合することによ
シ、複数個の情報を同時に検出することができる。この
場合に火炎光検出部６は前述の場合と同様に燃焼室から
離れた位置で光電変換するようにしである。また前述の
場合と同様に夫々の光電変換素子５ａ１．５ａ２に各気
筒の光ファイバケーブルを導いて信号処理することもで
きる。Other embodiments of the invention are shown in FIGS. 7-9. In this embodiment, the flame light detection device is constructed by using a band fiber 4f as the optical fiber 4 outside the screw casing. In this way, a plurality of photoelectric conversion elements 5
al, 5a2, and multiple pieces of information can be detected simultaneously compared to the case described above. That is, a multi-component optical fiber 2b' having a core 2c/ and a cladding 2d/ is
The parallel light of the flame light Q incident on l is made to be parallel light when it exits on Xl, and the rear end of the multi-component optical fiber 2b' having such a function is connected to the handle fiber 4f.
It was composed of The handle fiber 4f has a large number of optical fibers 4g bundled together and housed inside the jacket 11. This handle fiber 4f is connected to the multi-component optical fiber 2b via the connector 7a provided in the flame light introducing section 3.
Connect to /. Then, the bundled optical fibers 4g of the handle fiber 4f are separated into several pieces at a branch part 12.
By forming a branched optical fiber and coupling it with a plurality of photoelectric conversion elements 5al and 5a2 having different detection characteristics, a plurality of pieces of information can be detected simultaneously. In this case, the flame light detection section 6 is configured to perform photoelectric conversion at a position away from the combustion chamber, as in the case described above. Further, as in the case described above, the optical fiber cables of each cylinder can be guided to the respective photoelectric conversion elements 5a1 and 5a2 for signal processing.
第１θ図および第１１図には本発明の更に他の実施例が
示されている。本実施例は火炎光検出装置の火炎光導入
部３ａを点火プラグと一体に（１ケ成した。このように
することによシ火炎光導入部３ａは点火プラグと一体に
形成されるようになって、前述の場合よ）も火炎光導入
部３ａの燃焼室への取り付け？容易にすることができる
。この場合の火炎光尋人部３ａの基本的構成は前述のそ
れとほぼ同様である。すなわち石英系光ファイバ２ａの
出力端には多成分系光ファイバ２ｂが接合用金属体１０
に介して接合してあり、石英系光ファイバ２ａの入力端
は燃焼室側に突出させておる。Still other embodiments of the present invention are shown in FIG. 1θ and FIG. 11. In this embodiment, the flame light introduction part 3a of the flame light detection device is integrated with the spark plug (one piece is formed.By doing so, the flame light introduction part 3a is formed integrally with the spark plug. So, in the case mentioned above) is it also necessary to attach the flame light introduction part 3a to the combustion chamber? It can be easily done. The basic configuration of the flame light civilian section 3a in this case is almost the same as that described above. That is, the multicomponent optical fiber 2b is connected to the joining metal body 10 at the output end of the silica optical fiber 2a.
The input end of the silica-based optical fiber 2a is made to protrude toward the combustion chamber side.
そしてこの石英系光ファイバ２ａの外周に設けである金
属パイプを中心電極８ａとし、ねじケーシングを対地電
極１３として用いるようにした。従って対地電極１３部
と中心電極８ａ部とを所定のギャップに位置させるため
、対地電極１３先端の電極部Ｐは図示のように中心電極
８ａ側に折シ曲げた電極形状にする。セしてねじケーシ
ングでおる対地電極１３部、中心電極８ａ部および石英
系光ファイバ２ａは電気絶縁性にすぐれた耐熱性セラミ
ックスの絶縁体９（点火プラグ碍子と同様な性質が望ま
しい）を介して構成し、これら絶縁体９、対地電極１３
、中心電極８ａおよび石英系光フアイバ２ａ間の接合は
前述の場合と同様にして実施した。すなわち絶縁体９と
対地電極１３とは接合部Ｅでメタライズ後に銀ろう付け
で、中心電極８ａと絶縁体９とは接合部Ｆでメタライズ
後に銀ろう付けで、石英系光ファイバ２ａと中心電極８
ａとは接合用金属体１０の一方端の接合部Ｇで銀ろう付
けし、かつ多成分系光ファイバ２ｂと接合用金属体ｌＯ
の他方端とを接合部Ｈでガラス封着することで接合した
。そして多成分系光ファイバ２ｂは耐熱性セラミックス
の補助絶縁体９ａの内部を貫通するようにし、その端部
には光ファイバの接続用コネクタ７ｂを設けた。この補
助絶縁体９ａと絶縁体９とは接合部■でメタライズ後に
銀ろう付けした。A metal pipe provided around the outer periphery of the silica optical fiber 2a is used as the center electrode 8a, and a screw casing is used as the ground electrode 13. Therefore, in order to position the ground electrode 13 part and the center electrode 8a part with a predetermined gap, the electrode part P at the tip of the ground electrode 13 is bent toward the center electrode 8a side as shown in the figure. The ground electrode 13, the center electrode 8a, and the quartz optical fiber 2a, which are connected and covered by a screw casing, are connected through an insulator 9 made of heat-resistant ceramics with excellent electrical insulation properties (preferably properties similar to those of a spark plug insulator). These insulators 9 and ground electrodes 13
The joining between the center electrode 8a and the silica optical fiber 2a was carried out in the same manner as in the above case. That is, the insulator 9 and the ground electrode 13 are metallized and silver soldered at the joint E, the center electrode 8a and the insulator 9 are metalized and silver soldered at the joint F, and the quartz-based optical fiber 2a and the center electrode 8 are
a is silver-brazed at the joint G at one end of the metal body 10 for bonding, and is connected to the multi-component optical fiber 2b and the metal body lO for bonding.
It was joined by glass sealing the other end at the joining part H. The multi-component optical fiber 2b was made to pass through the inside of the auxiliary insulator 9a made of heat-resistant ceramics, and a connector 7b for connecting the optical fiber was provided at the end thereof. The auxiliary insulator 9a and the insulator 9 were metallized at the joint part (2) and then silver-brazed.
このようにｒることによシ燃焼室と大気との間は前述の
場合と同様に十分よくじや閉されるようになって、火炎
光導入部３ａの高気密性が確保できる。また、配電器か
らの電気信号は絶縁体９の一部に突出させて形成した高
圧端子１４よシ板ばね１５を介して接合用金属体ｌＯに
導かれ、さらに中心電極８ａに導かれる。なお石英系光
ファイバ２ａおよび多成分系光フアイバ２ｂ等の光ファ
イバは周知のように電気的絶縁性にすぐれているので、
このように数十ｋＶの高電圧の導電路と近接していても
何等の電気的影響を受けない。なおまたこの火炎光導入
部３ａに接続して設ける火炎光検出部は前述のいずれか
に選定すればよい。By doing so, the space between the combustion chamber and the atmosphere can be sufficiently closed as in the case described above, and a high airtightness of the flame light introducing section 3a can be ensured. Further, an electric signal from the power distributor is guided to the joining metal body IO via a high voltage terminal 14 formed to protrude from a part of the insulator 9, a leaf spring 15, and further guided to the center electrode 8a. Note that optical fibers such as the quartz optical fiber 2a and the multi-component optical fiber 2b have excellent electrical insulation properties, so
In this way, even if it is in close proximity to a conductive path with a high voltage of several tens of kV, it will not be affected electrically. Furthermore, the flame light detecting section provided in connection with this flame light introducing section 3a may be selected from any of the above-mentioned ones.
点火プラグの電極部Ｐとしては同図に記載しである形状
の他に、第１１図（ａ） 、 （ｂ） 、 （Ｃ）にも
示されているように各種の形状のものが選択できるよう
にした。同図（ａ）は対地電極１３を中心電極８ａの先
端部までは９出して電極部Ｐを形成し、中心電極８ａと
対地電極１３との間の火花放電によシ常に石英系光ファ
イバ２ａの入力端に付着した題埃が焼いて、洗浄効果を
促進するようにしたものである。同図（ｂ）は中心電極
８ａに対して対地電極１３を複数個設置して電極部Ｐを
形成し、火花放電の方向性を回避したものである。同図
（Ｃ）は中心電極８ａと対地電極１３との位置関係を考
え、同図（ａ）と（ｂ）との長所をとシ入れ、火花放電
による洗浄効果と複数の対地電極１３による方向性の回
避とを同時に図ったものである。これらの電極部Ｐのう
ち同図（ａ）・、（Ｃ）のようにすることにより、石英
系光ファイバ２ａをエンジン装着作業時に破損する不具
合をなくすことができる。どれは同図から明らかなよう
に、石英系光ファイバ２ａが対地電極１３によって覆わ
れるためである。In addition to the shapes shown in the same figure, various shapes can be selected for the electrode portion P of the spark plug, as shown in FIGS. 11(a), (b), and (C). I did it like that. In the figure (a), the ground electrode 13 is extended up to the tip of the center electrode 8a to form an electrode part P, and a spark discharge between the center electrode 8a and the ground electrode 13 is used to connect the silica-based optical fiber 2a. The dust attached to the input end of the filter is burnt to promote the cleaning effect. In FIG. 5B, a plurality of ground electrodes 13 are installed with respect to the center electrode 8a to form an electrode portion P, thereby avoiding the directionality of spark discharge. Figure (C) considers the positional relationship between the center electrode 8a and the ground electrode 13, combines the advantages of Figures (a) and (b), and combines the cleaning effect of spark discharge and the directionality of the plurality of ground electrodes 13. This is an attempt to avoid sex at the same time. By forming these electrode portions P as shown in FIGS. 12A and 21C, it is possible to eliminate the problem of damage to the silica-based optical fiber 2a during engine installation work. As is clear from the figure, this is because the silica-based optical fiber 2a is covered with the ground electrode 13.
第１２図は本発明の更に他の実施例が示されている。本
実施例は市販されている一般の点火プラグに火炎光検出
装置の火炎光導入部３ｂを一体化した。このようにする
ことによシ火炎光導入部３ｂは市販の点火プラグと一体
に形成されるようになって、前述の場合よシも火炎光導
入部３ｂの燃焼室への取シ付けを容易にすることができ
る。FIG. 12 shows yet another embodiment of the invention. In this embodiment, a flame light introduction section 3b of a flame light detection device is integrated into a commercially available general spark plug. By doing this, the flame light introduction part 3b can be formed integrally with a commercially available spark plug, making it easier to attach the flame light introduction part 3b to the combustion chamber than in the case described above. It can be done.
すなわち火炎光導入部３ｂを、点火プラグのねじケーシ
ング１６をねじケーシングとして構成したが、その５部
に挿入した石英系光ファイバ２ａの金屑パイプ８とねじ
ケーシング１６とは躍ろう付は等によシ接合する。石英
系光ファイバ２ａの入力側は燃焼室側へ突出させ、他方
端である出力端Ｉ（は同図に示されているように段付き
形状として図中Ｘ方向への抜けを防止するようにし／と
。すなわちこの出力端には図中矢印表示のＹ方向に対し
て直角となるように端面処理し、ここに第１の多成分系
光ファイバ２ｂｔ（石英系元ファイバでもよい）を挿入
・接続する。でしてこの第１の多成分系元ファイバ２ｂ
ｌで入射した火炎光を平行光として伝送する。次いでこ
の第１の多成分系光ファイバ２ｂ、に接続した第２の多
成分系光７アイバ２１）２は、集光作用を持ったレンズ
として構成し、この出力端部１７ではφ５０からφ２０
０μｍ８度に集光させる。この出力端部１７にコア径が
φ５０からφ２００μｍ程度の通信用などに匣用される
通常の元ファイバ１８を接続して火炎光導入部３ｂを構
成した。この光ファイバ１８と接続されるコネクタ１９
を有する光７アイバケープル４ａは、ゴム等の緩衝材２
０を介してねじケーシング１６と接合するようにした。In other words, although the flame light introduction part 3b is constructed using the threaded casing 16 of the spark plug as a threaded casing, the scrap metal pipe 8 of the quartz-based optical fiber 2a inserted into the 5th part of the threaded casing 16 and the threaded casing 16 are not easily soldered together. Join well. The input side of the silica-based optical fiber 2a is made to protrude toward the combustion chamber side, and the other end, the output end I (as shown in the figure, has a stepped shape to prevent it from coming off in the X direction in the figure). /.That is, this output end is treated so that it is perpendicular to the Y direction indicated by the arrow in the figure, and the first multi-component optical fiber 2bt (a quartz-based original fiber may also be used) is inserted here. Then, this first multi-component fiber 2b
The flame light incident at 1 is transmitted as parallel light. Next, the second multi-component optical fiber 21) 2 connected to the first multi-component optical fiber 2b is constructed as a lens with a light condensing function, and the output end 17 has a diameter of φ50 to φ20.
Focus the light at 0 μm and 8 degrees. A normal source fiber 18 used for communications, etc. having a core diameter of about 50 to 200 μm was connected to the output end 17 to form the flame light introduction section 3b. Connector 19 connected to this optical fiber 18
The light 7 Aiba cable 4a has a cushioning material 2 such as rubber.
The screw casing 16 is connected to the screw casing 16 through 0.
この場合に石英系光ファイバ２ａと金属パイプ８との間
の隙間からのガス、圧力の漏洩は、第１の多成分系光フ
ァイバ２ｂ、とねじケーシング１６との接合部りをガラ
ス封着することによシ容易に防止でき、火炎光導入部３
ｂの気密性が保持できる。In this case, leakage of gas and pressure from the gap between the silica optical fiber 2a and the metal pipe 8 is prevented by sealing the joint between the first multi-component optical fiber 2b and the screw casing 16 with glass. In particular, this can be easily prevented, and the flame light introduction section 3
The airtightness of b can be maintained.
上述のように本発明は火炎光導入部がコンパクトで耐熱
性、気密性が向上するようになって、コンパクトで耐熱
性、気密性の向上を可能とした火炎光導入部を有する火
炎光検出装置を得ることができる。As described above, the present invention provides a flame light detection device having a flame light introduction part that is compact and has improved heat resistance and airtightness. can be obtained.
図面の？１ｊ単な説明
第１図は本発明の火炎光検出装置の一実施例の装置要部
の縦断側面図、第２図は同じく一実施例の火炎光導入部
の縦断側面図、第３図は第２図のＰ、矢視図、第４図は
同じく一実施例の火炎光導入部の石英系光フアイバ部の
拡大縦断側面図、第５図 （ａ）、 （ｂ）、 （
Ｃ）、 （ｄ ）ｔ （ｅ） は同じく一実施例
の石英系光フアイバ入力端の夫々異なる形状を示す縦断
側面図、第６図は同じ＜ 一実施例の多成分系光ファイ
バによる集光状態を示す説明図、第７図は本発明の火炎
光検出装置の他の実施例の装置要部の縦断側面図、第８
図は同じく他の実施例の多成分系光７アイバによる集光
状態を示す説明図、第９図は同じく他の実施例のハンド
ル・ファイバの断面図、第１０図は本発明の火炎光検出
装置の更に他の実施例の火炎光導入部の縦断側面図、第
１１図（ａ）、（ｂ）、（Ｃ）は同じく更に池の実施例
の中心電極と対地電極との電極部の夫々異なる構成を示
す縦断側面図、第１２図は本発明の火炎光検出装置の更
に他の実施例の火炎光導入部の縦断側面図である。Of the drawing? 1j Simple Explanation FIG. 1 is a longitudinal sectional side view of the main parts of an embodiment of the flame light detection device of the present invention, FIG. 2 is a longitudinal sectional side view of the flame light introducing section of the same embodiment, and FIG. P in FIG. 2 is a view taken in the direction of arrows; FIG. 4 is an enlarged longitudinal cross-sectional side view of the quartz optical fiber portion of the flame light introducing section of one embodiment; FIGS. 5 (a), (b), (
C), (d)t (e) are longitudinal sectional side views showing different shapes of the input ends of the silica optical fiber of one embodiment, and FIG. 6 is the same. FIG. 7 is an explanatory view showing the state, and FIG.
The figure is an explanatory diagram showing the state of convergence by the multi-component light 7 eyeball of another embodiment, FIG. 9 is a cross-sectional view of the handle fiber of another embodiment, and FIG. 10 is a flame light detection according to the present invention. FIGS. 11(a), (b), and (C) are longitudinal sectional side views of the flame light introduction part of still another embodiment of the device, and respectively show the electrode parts of the center electrode and the ground electrode of the further embodiment of the device. FIG. 12 is a vertical side view of a flame light introducing section of still another embodiment of the flame light detection device of the present invention.
１・・・ねじケーシング、２・・・光導体、２ａ・・・
石英系光ファイバ、２ｂ、２ｂ’・・・多成分系光ファ
イバ、２Ｉ）！・・・第１の多成分系光ファイバ、２ｂ
２・・・第２の多成分系光ファイバ、２Ｃ，２Ｃ’・・
・コア、２ｄ、２ｄ’−・・クラッド、３，３ａ、３ｂ
−火炎光導入部、４・・・ねじケーシング外光ファイバ
、４ａ−−−光ファイバケーブル、４ｂ、４Ｃ，４（ｉ
。1... Screw casing, 2... Light guide, 2a...
Silica optical fiber, 2b, 2b'...Multi-component optical fiber, 2I)! ...first multi-component optical fiber, 2b
2...Second multi-component optical fiber, 2C, 2C'...
・Core, 2d, 2d'--Clad, 3, 3a, 3b
-Flame light introduction part, 4... Optical fiber outside the screw casing, 4a---Optical fiber cable, 4b, 4C, 4(i
.
４ｅ・・・光７フイパ、４ｆ・・・バンドル・コアイノ
（，４ｇ・・・光ファイバ、５・・・光電変換部、５ａ
、５ａｌ。4e... Optical 7 fiber, 4f... Bundle core ino (, 4g... Optical fiber, 5... Photoelectric conversion unit, 5a
, 5al.
５ａ２・・・光電変換素子、５ｂ・・・信号処理回路、
６・・・火炎光検出部、７，７ａ、７ｂ・・・接続コネ
クタ、８・・・金属パイプ、８ａ・・・中心′ＦｉＬ極
（金属ツクイブ）、９・・・絶縁体、９ａ・・・補助絶
縁体、１０・・・接合用金属体、１１・・・外被、１３
・・・対地電極（ねじケーシング）、１４・・・高圧端
子、１６・・・ねじケーシング、１８・・・光ファイバ
、２０・・・緩衝材。5a2... Photoelectric conversion element, 5b... Signal processing circuit,
6...Flame light detection unit, 7, 7a, 7b...Connector, 8...Metal pipe, 8a...Center'FiL pole (metal tube), 9...Insulator, 9a... - Auxiliary insulator, 10... Metal body for joining, 11... Outer cover, 13
...Ground electrode (screw casing), 14...High voltage terminal, 16...Screw casing, 18...Optical fiber, 20...Buffer material.
Claims (1)
シングおよびこのねじケーシング内に配設され、前記火
炎光を入射伝播する少なくとも一つの光導体を有する火
炎光導入部と、前記光導体に接続され、かつ前記ねじケ
ーシングの外部に配設されたねじケーシング外光ファイ
バおよびこの光ファイバに接続され、前記入射・伝播し
た火炎光を光電変換する光電変換部を有する火炎検出部
とを備えているものにおいて、前記光導体を、その外周
が金属パイプで覆われ、かつコアおよびクラッドが石英
の石英系光ファイバと、この石英系光ファイバの出力端
に接続された多成分系光ファイバとで形成すると共に、
前記石英系光ファイバの入力端を前記ねじケーシングか
ら前記燃焼室側へ突出させたことを特徴とする火炎光検
出装置。 ２、前記火炎光導入部が、前記金属パイプを中心電極と
し、前記ねじケーシングを対地電極として点火プラグの
機能を有するように構成されたものである特許請求の範
囲第１項記載の火炎光検出装置。 ３、前記ねじケーシングが、一般の点火プラグのねじケ
ーシングで形成されたものである特許請求の範囲第１項
記載の火炎光検出装置。 ４、前記ねじケーシング外光ファイバか、光ファイバケ
ーブルまたはハンドル・ファイバで形成されたものであ
る特許請求の範囲第１項記載の火炎光検出装置。[Claims] 1. A device for detecting combustion flame light in a combustion chamber includes a screw casing and a flame light introducing section disposed within the screw casing and having at least one light guide through which the flame light enters and propagates. and a flame having a screw casing external optical fiber connected to the light guide and disposed outside the screw casing, and a photoelectric conversion unit connected to the optical fiber and photoelectrically converting the incident and propagated flame light. The light guide includes a quartz-based optical fiber whose outer periphery is covered with a metal pipe and whose core and cladding are quartz, and a multi-layer optical fiber connected to the output end of the silica-based optical fiber. In addition to forming the component optical fiber,
A flame light detection device characterized in that an input end of the quartz-based optical fiber protrudes from the screw casing toward the combustion chamber. 2. Flame light detection according to claim 1, wherein the flame light introduction part is configured to have the function of a spark plug with the metal pipe as a center electrode and the screw casing as a ground electrode. Device. 3. The flame light detection device according to claim 1, wherein the threaded casing is formed of a threaded casing of a general spark plug. 4. The flame light detection device according to claim 1, wherein the flame light detection device is formed of an optical fiber outside the screw casing, an optical fiber cable, or a handle fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59177323A JPS6154416A (en) | 1984-08-24 | 1984-08-24 | Flame light detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59177323A JPS6154416A (en) | 1984-08-24 | 1984-08-24 | Flame light detecting device |
Related Child Applications (5)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4229669A Division JPH0776707B2 (en) | 1992-08-28 | 1992-08-28 | Flame light detector |
| JP4229671A Division JPH0776709B2 (en) | 1992-08-28 | 1992-08-28 | Flame light detector |
| JP4229668A Division JPH0776706B2 (en) | 1992-08-28 | 1992-08-28 | Flame light detector |
| JP4229670A Division JPH0776708B2 (en) | 1992-08-28 | 1992-08-28 | Flame light detector |
| JP4229667A Division JPH0776705B2 (en) | 1992-08-28 | 1992-08-28 | Flame light detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6154416A true JPS6154416A (en) | 1986-03-18 |
| JPH0511251B2 JPH0511251B2 (en) | 1993-02-15 |
Family
ID=16028967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59177323A Granted JPS6154416A (en) | 1984-08-24 | 1984-08-24 | Flame light detecting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6154416A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5191739A (en) * | 1989-12-07 | 1993-03-09 | Toyota Jidosha Kabushiki Kaisha | Method and apparatus for lapping gear teeth while changing at least one of load torque, rotating speeds and rate of teeth contact point movement of the gears |
| WO1999014565A1 (en) * | 1997-09-16 | 1999-03-25 | Applied Materials, Inc. | Temperature probe |
-
1984
- 1984-08-24 JP JP59177323A patent/JPS6154416A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5191739A (en) * | 1989-12-07 | 1993-03-09 | Toyota Jidosha Kabushiki Kaisha | Method and apparatus for lapping gear teeth while changing at least one of load torque, rotating speeds and rate of teeth contact point movement of the gears |
| WO1999014565A1 (en) * | 1997-09-16 | 1999-03-25 | Applied Materials, Inc. | Temperature probe |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0511251B2 (en) | 1993-02-15 |
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