JPS6014013A - Observation method for combustion surface - Google Patents

Observation method for combustion surface

Info

Publication number
JPS6014013A
JPS6014013A JP12151283A JP12151283A JPS6014013A JP S6014013 A JPS6014013 A JP S6014013A JP 12151283 A JP12151283 A JP 12151283A JP 12151283 A JP12151283 A JP 12151283A JP S6014013 A JPS6014013 A JP S6014013A
Authority
JP
Japan
Prior art keywords
combustion
light
flame
wavelength
laser
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
Application number
JP12151283A
Other languages
Japanese (ja)
Other versions
JPH0480290B2 (en
Inventor
Shohei Noda
野田 松平
Masayoshi Murata
正義 村田
Hideaki Oota
英明 太田
Masayasu Sakai
正康 坂井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP12151283A priority Critical patent/JPS6014013A/en
Publication of JPS6014013A publication Critical patent/JPS6014013A/en
Publication of JPH0480290B2 publication Critical patent/JPH0480290B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Control Of Combustion (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

PURPOSE:To enable observation of a combustion surface which is under combustion, by a method wherein a combustion body is irradiated with a light beam wavelength thereof is not contained in a combustion flame, and light reflected by the combustion body and a combustion flame are observed through a filter through which only said wavelength passes. CONSTITUTION:Light beam with a wavelength substantially not contained in light emitted from the combustion flame of a combustion body 1 is emitted as a laser light 3 by, for example, a laser device 2, and is guided to a beam expander 5 through a mirror 4. A proper spread angle is formed therein, and the surface of the combustion body 1 is irradiated therewith. A laser light 6 and a combustion flame, which are reflected by the combustion surface, are caused to pass through an interference surface, are caused to pass through an interference filter 7 through which only the laser light passes, and an image is formed by a camera 8 or a television camera to observe the combustion surface.

Description

【発明の詳細な説明】 本発明は、燃焼表面の表面状態を観察する方法に関する
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of observing the surface condition of a combustion surface.

燃焼表面の表面状態を観察する方法として、カメラ及び
テレビカメラを用いる方法が考えられる。しかし、燃焼
表面は、燃焼火炎で被われ、その火炎輝度が非常に強い
ため、単にカメラ。
A possible method for observing the surface condition of the combustion surface is to use a camera or a television camera. However, the burning surface is covered with combustion flame, and its flame brightness is so strong that it simply cannot be seen by the camera.

テレビカメラを用〜1ても火炎のみが観察され、燃焼表
面を観察できない。
Even with a television camera, only the flames could be observed, and the burning surface could not be observed.

本ipハは、上記事情に鑑みてなされたもので、EMt
−中の燃料表面を観察することができる方法を得んとす
るものである。
This IP was created in view of the above circumstances, and EMt
- The aim is to develop a method that allows observation of the surface of the fuel inside.

すなわち本発明は、燃焼物体の燃焼火炎から放出された
光に実質的に含まれない波長を有する光(例えばレーザ
光)を上記燃焼物体に向けて照射し、照射された光の燃
焼物体表面での反射光及び上記燃焼火炎を上記波長の光
のみを通すフィルタを通してカメラ、7−レピカメラ等
で観察することによル燃焼表面のみを観察できる方法で
ある。
That is, the present invention irradiates the combustion object with light (for example, laser light) having a wavelength that is not substantially included in the light emitted from the combustion flame of the combustion object, and the irradiated light is applied to the surface of the combustion object. This is a method in which only the combustion surface can be observed by observing the reflected light and the combustion flame with a camera, 7-rep camera, etc., through a filter that allows only the light of the wavelengths mentioned above to pass through.

以下本発明方法を図示する実施例を参照して説明する。The method of the present invention will be explained below with reference to illustrative examples.

この方法は、燃焼物体1(例えば固体燃料)の燃焼表面
を観察する方法で、まずレーザ装置2がらレーザ光3を
発する。このレーザ光3は、燃焼物体の燃焼火炎から放
出された光に実質的に含まれない、即ち全く含まれない
か又は僅かにしか含まれない波長の光である。このレー
ザ光3をミラー4を経てビームエキスパンダ5に導き、
ここで適当な拡がυ角をもたらせ、燃焼物体1表面に照
射する0燃焼表面から反射されたレーザ光6及び燃焼火
炎をレーザ光のみを透過する干渉フィルタ7を通して、
カメラ8又はデルビカメン等によって結像して燃焼表面
を観察する。
In this method, the burning surface of a burning object 1 (for example, solid fuel) is observed, and first, a laser beam 3 is emitted from a laser device 2. This laser light 3 has a wavelength that is substantially not included in the light emitted from the combustion flame of the combustion object, that is, it is not included at all or is included only slightly. This laser beam 3 is guided to a beam expander 5 via a mirror 4,
Here, an appropriate spread is made to provide an angle υ, and the laser beam 6 reflected from the combustion surface and the combustion flame that irradiates the surface of the combustion object 1 are passed through an interference filter 7 that transmits only the laser beam.
The combustion surface is observed by imaging it with a camera 8 or a dervikamen.

ここで、レーザ照明における燃焼表面の輝度13r、は
次式で表わされるO BT、 =ρM×τB×ρp X (Po/Ao) X
ρIF・・・・・・(1) 但し、ρM :ミラーの反射率 τB =ビームエキスパンダの透過率 ρ)・:燃焼表面の反射率 Po :レーザ光の出力(W) Ao :燃料表面におけるレーザ光の断面積(ch& 
) ρIF:干渉フィルタの透過率 レーリ゛ビームを所望の位置に導くためには通常2枚の
ミラーが必要で、ρM”0.6 となる。
Here, the brightness 13r of the combustion surface under laser illumination is expressed by the following formula O BT, = ρM×τB×ρp X (Po/Ao)
ρIF...(1) However, ρM: Mirror reflectance τB = Beam expander transmittance ρ): Reflectance of combustion surface Po: Laser light output (W) Ao: Laser on the fuel surface Cross-sectional area of light (ch &
) ρIF: Transmittance of interference filter In order to guide the Rayleigh beam to a desired position, two mirrors are normally required, and ρM”0.6.

又、ビームエキスパンダも通常2枚のレンズを使用する
のでτE−Q、 6 とな′る。燃料表面の反射率は黒
色表面でも5%程度はあるので、ρPΣ0.05 とな
る。レーザ出力はアルゴンレーザを用いれば0.5 W
程度の出力は容易に得られるQ PoΣ0.5(W)。
Also, since a beam expander usually uses two lenses, τE-Q,6. Since the reflectance of the fuel surface is about 5% even for a black surface, ρPΣ0.05 is obtained. Laser output is 0.5 W if argon laser is used
An output of about Q PoΣ0.5 (W) can be easily obtained.

レーザ光断面積は燃料の大きさに合わせる必要があるが
、今、直径15m1lφ程度の大きさを考えると、A 
o= πx 1.52/4 = 1.8 (i)。干渉
フィルタの透過率は通常70チ程度であるが、製作誤差
のため干渉フィルタの中心波長とレーザ波長が通常着干
異なシ透過率が低くなるため ρrr =−0,1程度を考えておく必要がある。以上
の値を(1)式に代入すると BLユ0.6 Xo、6 Xo、05 X (0,5/
1.8 )XO,−1=5×10−’(W、/c++t
) ・・−・−(2)一方燃焼火炎の輝度スペクトラム
の最大値Bλ(T) は理論的にめられ次式で与えられ
る〇ここで λ:波長〔μ:ミクロン〕 T:火炎温度〔0K〕 CH−3,74X 10’ (W・tt’/ctl )
C2=1.44X10’Cμ#0K〕 (2)式で表わされる輝度スペクト2ムをもった火炎を
、アルゴンレーザの波長(5145X、)に中心波長(
λmax)をもつ半値巾(Δλ+)20人の干渉フィル
タを通し観測した場合の輝度BIF(T)は、火炎温度
を1500°にと仮定すると次式で与えられる。
The cross-sectional area of the laser beam needs to match the size of the fuel, but considering the size of the fuel, which is about 15m1lφ in diameter, A
o= πx 1.52/4 = 1.8 (i). The transmittance of an interference filter is usually about 70 cm, but due to manufacturing errors, the center wavelength of the interference filter and the laser wavelength are usually different, so the transmittance will be low, so it is necessary to consider ρrr = about -0.1. There is. Substituting the above values into formula (1), BL Yu0.6 Xo, 6 Xo, 05 X (0,5/
1.8)XO,-1=5×10-'(W,/c++t
) ・・・・−(2) On the other hand, the maximum value Bλ(T) of the brightness spectrum of the combustion flame is determined theoretically and given by the following formula〇where λ: Wavelength [μ: Micron] T: Flame temperature [0K ] CH-3,74X 10'(W・tt'/ctl)
C2=1.44
The brightness BIF(T) when observed through 20 interference filters with a half-width (Δλ+) of λmax) is given by the following equation, assuming that the flame temperature is 1500°.

上式においてρIF(λ)は干渉フ・イルタの透過率の
波長依存性を示す。
In the above equation, ρIF(λ) indicates the wavelength dependence of the transmittance of the interference filter.

(2)式と(3)式の比較から BI F (1500) /BLユ2.6% ・・・・
・・(5)(5)式から判るように、レーザ照明と干渉
フィルタを用いた場合の燃料表面の輝度BL は、干渉
フィルタを通して見た燃焼火炎の輝度BIFの約40倍
となる。このため、観測画像には事実上燃焼火炎が消去
され、燃焼表面のみを観察できる0 1(工2図に1500’にの場合のBλ(T)の波長依
存性及びアルゴンレーザ照明による燃料表面輝度BL 
を示す。
From the comparison of formula (2) and formula (3), BIF (1500) /BL Yu2.6%...
(5) As can be seen from equation (5), the brightness BL of the fuel surface when laser illumination and an interference filter are used is approximately 40 times the brightness BIF of the combustion flame seen through the interference filter. Therefore, the combustion flame is virtually erased from the observation image, and only the combustion surface can be observed. BL
shows.

以上の如く本発明によれば、燃焼火炎が消去され、従来
観県できなかった燃焼表面が観察できるようになるため
、燃焼解析上の効果が大きい0
As described above, according to the present invention, the combustion flame is eliminated and the combustion surface, which could not be observed conventionally, can be observed.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明方法の一例を示す説明図、第2図は15
00°にの場合における燃焼火炎の輝度スペクトラムの
最大値Bλ(T)の波長依存性及びアルゴンレーザ照明
による燃料表面輝度Br。 を示す特性図である。 1・・・燃焼物体、2・・・レーザ装置、3,6・・・
レーザ光、4・・・ミラー、5・・・ビームエキヌパン
ダ、7パ・フィルタ、8・・・カメラ。 出願人復代理人 弁理士 鈴 江 武 形彫1 図
FIG. 1 is an explanatory diagram showing an example of the method of the present invention, and FIG.
The wavelength dependence of the maximum value Bλ(T) of the brightness spectrum of the combustion flame in the case of 00° and the fuel surface brightness Br by argon laser illumination. FIG. 1... Burning object, 2... Laser device, 3, 6...
Laser light, 4...Mirror, 5...Beam ekinupanda, 7 pass filter, 8...Camera. Applicant Sub-Agent Patent Attorney Takeshi Suzue Figure 1

Claims (1)

【特許請求の範囲】[Claims] 燃焼物体の燃焼火炎から放出された光に実質的に含まれ
ない波長を有する光を上記燃焼物体に向けて照射し、照
射された光の燃焼物体表面での反射光及び上記燃焼火炎
を上記波長の光のみを通すフィルタを通して観察するこ
とを特徴とする燃焼表面の観察方法。
Light having a wavelength that is not substantially included in the light emitted from the combustion flame of the combustion object is irradiated toward the combustion object, and the reflected light of the irradiated light on the surface of the combustion object and the combustion flame are reflected at the wavelength of the combustion object. A method for observing a combustion surface, which is characterized by observing through a filter that allows only light to pass through.
JP12151283A 1983-07-06 1983-07-06 Observation method for combustion surface Granted JPS6014013A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12151283A JPS6014013A (en) 1983-07-06 1983-07-06 Observation method for combustion surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12151283A JPS6014013A (en) 1983-07-06 1983-07-06 Observation method for combustion surface

Publications (2)

Publication Number Publication Date
JPS6014013A true JPS6014013A (en) 1985-01-24
JPH0480290B2 JPH0480290B2 (en) 1992-12-18

Family

ID=14813031

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12151283A Granted JPS6014013A (en) 1983-07-06 1983-07-06 Observation method for combustion surface

Country Status (1)

Country Link
JP (1) JPS6014013A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6654104B2 (en) 2000-10-13 2003-11-25 Advantest Corporation Apparatus and method for measuring optical characteristics and recording medium
JP2009293208A (en) * 2008-06-03 2009-12-17 Gantan Beauty Ind Co Ltd Manufacturing method for ceiling dressing material
JP2015232474A (en) * 2014-06-09 2015-12-24 一般財団法人電力中央研究所 Imaging method and imaging apparatus for particle in flame
CN111637489A (en) * 2020-05-21 2020-09-08 广西壮族自治区特种设备检验研究院 Boiler furnace fire observation device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6654104B2 (en) 2000-10-13 2003-11-25 Advantest Corporation Apparatus and method for measuring optical characteristics and recording medium
JP2009293208A (en) * 2008-06-03 2009-12-17 Gantan Beauty Ind Co Ltd Manufacturing method for ceiling dressing material
JP2015232474A (en) * 2014-06-09 2015-12-24 一般財団法人電力中央研究所 Imaging method and imaging apparatus for particle in flame
CN111637489A (en) * 2020-05-21 2020-09-08 广西壮族自治区特种设备检验研究院 Boiler furnace fire observation device

Also Published As

Publication number Publication date
JPH0480290B2 (en) 1992-12-18

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