JPH045797A - Dust detector - Google Patents
Dust detectorInfo
- Publication number
- JPH045797A JPH045797A JP2107824A JP10782490A JPH045797A JP H045797 A JPH045797 A JP H045797A JP 2107824 A JP2107824 A JP 2107824A JP 10782490 A JP10782490 A JP 10782490A JP H045797 A JPH045797 A JP H045797A
- Authority
- JP
- Japan
- Prior art keywords
- light
- section
- dust detection
- light emitting
- focal point
- 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
- 239000000428 dust Substances 0.000 title claims abstract description 49
- 230000004907 flux Effects 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims description 46
- 239000002245 particle Substances 0.000 abstract description 16
- 239000000779 smoke Substances 0.000 abstract description 12
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 230000010355 oscillation Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000011896 sensitive detection Methods 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
Abstract
Description
【産業上の利用分野１
本発明は粉塵、殊に煙粒子を検出する家庭用の粉塵検出
装置に関する。
【従来の技術】
生活空間における喫煙などによる空気を汚れを早期に検
出して警報や空気清浄機器の自動制御のための電気的信
号を得る手段としては、ガスセンサーにみられるガス吸
着式５イオン化現象を利用したイオン式、光学的手段に
よる光の透過率や反射光量の変化から微粒子の検知を行
う光電式などが広く普及している。
これらの中で、ガス吸着式やイオン式のものは、煙粒子
だけでなく、他のガス分子についても高い感度を有して
いるために、煙粒子の選択的な検出は困難である。
透過率を検知する光電式のものでは、煙粒子濃度が高い
時には有効な手段であるが、生活空間では高レベルであ
るものの測定という点からすれば低レベルである煙粒子
濃度１ ｍｇ／ａ″の領域では有効ではない。
このような観点からすれば、１ ｍｇ／ｍ’程度以下の
煙粒子濃度レベルでの検出手段としては、光電反射式が
好適である。FIELD OF INDUSTRIAL APPLICATION 1 The present invention relates to a domestic dust detection device for detecting dust, in particular smoke particles. [Prior Art] Gas adsorption type 5 ionization, which is found in gas sensors, is a means of early detecting air pollution caused by smoking in living spaces and obtaining electrical signals for alarms and automatic control of air purification equipment. The ionic type, which uses phenomena, and the photoelectric type, which detects particles from changes in light transmittance and amount of reflected light using optical means, are widely used. Among these, the gas adsorption type and ionic type have high sensitivity not only to smoke particles but also to other gas molecules, making it difficult to selectively detect smoke particles. The photoelectric type that detects transmittance is an effective method when the smoke particle concentration is high, but although it is high in living spaces, it is low from the measurement point of view.Smoke particle concentration 1 mg/a'' From this point of view, a photoelectric reflection type is suitable as a detection means at a smoke particle concentration level of about 1 mg/m' or less.
しかし、光電反射式で実際に煙粒子濃度が上記レベル以
下でも確実な検出を行えるものを製作するとなると、光
学的にも電気的にも高い感度が要求されるために、複雑
な構成となるとともに高価なものとなってしまい、実際
上、工業用計器としては提供されているものの、家庭用
としては存在していない。
本発明はこのような点に鑑み為されたものであり、その
目的とするところは簡単な構成で安価に製作できるもの
の、高い検出能力を備えて、家庭用として好適である粉
塵検出装置を提供するにある。However, if we were to manufacture a photoelectric reflection type device that can actually detect smoke particle concentrations below the above level, it would require a complex configuration as it would require high sensitivity both optically and electrically. It is expensive, and although it is actually provided as an industrial meter, it does not exist for home use. The present invention has been made in view of these points, and its purpose is to provide a dust detection device that has a simple configuration, can be manufactured at low cost, has high detection ability, and is suitable for home use. There is something to do.
しかして本発明は、粉塵検出部に光束を照射する発光部
と、粉塵検出部からの散乱光を受光する受光部とを備え
た粉塵検出装置において、楕円形反射面のように二つの
焦点を備えるとともに一方の焦点位置に粉塵検出部を、
他方の焦点位置に受光部を位置させる反射面と、粉塵検
出部である上記一方の焦点を通過する発光部の光束を他
方の焦点に向けない光束抑制手段と、粉塵検出部に気体
を導く導入部と、この気体を排出する排出部とを具備し
ていることに主たる特徴を有し、そして上記導入部と排
出部とは粉塵検出部である一方の焦点をはさんで対向す
る位置に設けられていることに第２の特徴を備え、上記
光束抑制手段は、発光部と一方の焦点との間に配された
レンズと、レンズ及び一方の焦点を通過した光束を発光
部に向けて反射して発光部の発光面に再結像させる凹面
型の反射鏡とからなることに第３の特徴を有し、更に上
記発光部の発光量を検出する光量検出手段を備えるとと
もに、この光量検出手段の出力に応じて発光部の発光量
を制御する制御手段を備えていることに第４の特徴を有
している。
［作用１
本発明によれば、粉塵検出部にある粒子が発光部からの
光束を散乱させる時、この散乱光は空間的に広く拡散す
るが、この散乱光は反射面によって受光部側に集められ
るために、感度のよい検出を行うことができるものであ
り、また散乱光以外の迷光が受光部に入ることが殆どな
いために、Ｓ／Ｎの良い検出を行うことができる。
［実施例］
以下本発明を図示の実施例に基づいて詳述すると、本発
明に係る粉塵検出装置は、第１図及び第２図に示すよう
に、光束を粉塵検出部に向けて投射する発光部１と、粉
塵検出部で生じた散乱光を受光する受光部２と、二つの
焦点ｆ、、ｆ２を有する楕円形の反射面３、発光部１と
相対して発光部３から投射された光束を発光部１に戻す
反射鏡４、気体を粉塵検出部に導入するための導入部５
、粉塵検出部に入った気体を排出するための排出部６と
かなるものとして形成されている。
そして、ここにおける反射面３は、中空の回転楕円体を
短軸面で分割した半球の内面とほぼ同じ形状のものとな
っており、赤外発光ダイオードからなる発光部１は回転
楕円体の短軸方向と平行であり且つ反射面３に近い方の
焦点ｆ１を通る光束を投射するものとなっているととも
に、受光部２は反射面３から遠い方の焦点ｆ７位置に反
射面３を向くように配されたものとなっている。尚、上
記反射面３は、中空の回転楕円体の半球として形成され
た物の内面を反射効率の良い色つやに塗装すると、高感
度なものを得ることができる。
そして、上記発光部１から出た光束は、レンズ１０によ
って上記焦点ｆ１に集光し、更に焦点ｆをはさんで発光
部１０と対向する位置にあるとともに、焦点位置が上記
焦点ｆ１にくるようにされた凹面型反射鏡４によって、
発光部１に光束が戻るとともに発光部１に再結像するよ
うになっている。つまり、現実の問題としてはアライメ
ント誤差やレンズ１０による反射などによって迷光を発
生させてしまうものの、理論的には発光部１と反射鏡４
との間で光が往復するのみとなっているわけであり、一
般的な光トラップなどと比較すれば、迷光の発生量は著
しく低い。
一方、導入部らと排出部６は、上記回転楕円体の短軸方
向において、上記焦点ｆ１をはさんで対向する位置に設
けられており、排出部６が吸引ポンプ等に接続される関
係上、導入部５から入った気体は焦点ｆ１を横切って排
出部６へと直進することになる。尚、この実施例では、
発光部１が発する光束と、上記気体の流れとは、上記楕
円回転体の長袖方向と直交する面内において焦点ｆ、の
位置で交差する。
さて、この粉塵検出装置においては、上記焦点ｆ１付近
が主たる粉塵検出部となっており、気体とともに流入し
た煙粒子等の第１図中に点で示している微粒子が焦点ｆ
１付近に位置して、この位置で発光部１からの光束を散
乱させたならば、その−次数乱光は一部が直接受光部２
に入るとともに、大半が反射面３による反射を経て焦点
ｆ２に位１している受光部２に入る。
また、焦点ｆ１以外のところに位置する微粒子のなかで
、光束の通過路に位置するものは、散乱光の一部を直接
受光部２に入れるとともに、焦点ｆ１を通過する一次散
乱光を反射面３を介して受光部２に入れる。
そして、光束の通過路以外に位置する煙粒子は、迷光に
よる一次散乱光の一部を受光部２に向かわせるとともに
、本来、受光部２に入るべき散乱光の遮蔽物となるが、
これらはいずれも変改減衰を伴うものとなっている上に
、排出部６に吸引ポンプ等が接続されて吸引がなされて
いるために、煙粒子が粉塵検出部以外に広がることが殆
どないこともあって、計測上有意ではない。
つまり、粉塵検出部にある微粒子による散乱光は、高効
率で受光部２に集められるものであり、また外乱となる
光が受光部２に達することも殆どなく、従って粉塵検出
についての感度がきわめて良好となるともに、Ｓ／Ｎも
良好なものである。
反射鏡４とレンズ１０の間隔を大きくして配置するとと
もに、反射Ｍ４及びレンズ１０を十分長い筒体の奥に収
納することで、これらと煙粒子との直接的な接触を避け
るならば、光学系感度の長期的な安定性を保持すること
ができる。
反射面３は、第３図に示すように、完全な中空の回転楕
円体の内面として形成されたものであってもよく、第４
図に示すように、楕円筒体の内面として形成されたもの
であってもよい、更には第５図に示すように、多数個の
反射面３０の組み合わせで全体として二つの焦点ｆ１．
ｆｚを備えた反射面３を構成するものであってもよい。
第６図に示すように、発光部１と導入部５とを同じとこ
ろに配置してもよい。この場合、外乱光が内部に侵入す
ることがなく、安定した計測が可能となる。また発光部
１と導入部５あるいは排出部６は、第７図に示すように
、反射面３以外の位置に配置してもよく、発光部１は第
８図に示すように、その投光方向が反射面３と受光部２
とを除く方向となる位置に配置してもよい。
発光部１が平行光束を投射するものであれば、光束の拡
散がないために、第９図に示すように、レンズ１０は不
要となる８
第１０図は外観の一例を、第１１図は発光部１の発光量
の補正を行うことができる電気回路の一例を示している
。
上記電気回路について説明すると、図中１１は、Ｃ１５
ｉｎωｔの正弦波を発生する発振回路であり、この正弦
波はアンプ１２で電力増幅されて発光部１が発する光の
光量を正弦波的に変調する。
一方、受光部２の出力は、アンプ１４で増幅された後、
バンドパスフィルター１５によって直流分がカットされ
る。そして、上記発振回路１１の発振出力の位相を変化
させたものと、上記バンドパスフィルター１５の出力と
が、乗算器１６において処理される。
すなわち、乗算器１６に導かれる発振回路１１の出力は
、位相器１３においてＣ１ｓｉｎωｔがらＣｓ１ｎ（ω
ｔ＋β〉に変換されている。バンドパスフィルター１５
の出力のうち、基本波（ω／２π Ｈｚ）をＣ２ｓｉｎ
（ωを十α）とすると、乗算結果は０．５ＣＩＣ２ｉｃ
ｏｓ（β−ａ ）−ｃｏｓ（２ωｔ＋ ａ＋β））すな
わち同相成分についてのみ、ｏ、ｓｃ ＋ Ｃ２Ｃ（１
３（βα）の直流成分を生じ、他の周波数成分について
は交番信号となり、基本波は２倍の周波数となる。
従って乗算器１６の出力を受けるローパスフィルター１
７のコーナー周波数を２ω／２πが十分に減衰するよう
に、且つ上記バンドパスフィルター１５の低域コーナー
周波数をも十分に減衰するように設定することによって
、ω／２πの基本波の受信信号のみを選択的に直流成分
として取り出すことができる。
そして、ここではローパスフィルター１７からの出力レ
ベルを受けてコンパレータ１８とスイッチング素子ｓｗ
１．ｓｗ２とによって発光部１の発光量を制御している
。つまり、発光部１の発光面やレンズ１０が汚れておら
ず、所要の光量が得られている時には、コンパレータ１
８への入力レベルか所定レベルより高くなっているため
に、スイッチング素子Ｓ Ｗ ２が閉じて、抵抗Ｒ２に
より発光電流か抑えられており、従って発光量が抑制さ
れた状態にあるが、発光部１の発光面やレンズ１０か°
汚れるといった理由でコンパレータ１８出力が所定レベ
ルより低くなれば、スイッチング素子ＳＷ、が閉じて抵
抗Ｒ，によって設定された通常の電流が発光部１に流れ
ることになり、発光量の抑制が解除される。従って、電
気的外乱や汚れによる性能低下が生じたとしても、これ
は補償されることになり、安定した粉塵検出を行うこと
ができる。
第１２図及び第１３図に示すように、反射鏡４を半透明
とするとともにこの反射鏡４の背後に第２受光部２２を
配室して、半透明の反射鏡４を通過する光量を第２受光
部２２で検出することで発光部１の発光量を常時監視し
、そして第２受光部２２の増幅器２３を経た出力を、負
帰還信号として光量制御回路２４に入力して、第２受光
部２２で受光される光量が常に一定レベルにようになる
ように、光量制御回路２４が発光素子駆動回路２５を通
じて発光部１の発光量を制御するようにしてもよい。Accordingly, the present invention provides a dust detection device that includes a light emitting section that irradiates a light beam onto a dust detection section and a light receiving section that receives scattered light from the dust detection section. At the same time, a dust detection unit is installed at one focal position.
A reflective surface that positions the light receiving section at the other focal point, a light flux suppressing means that prevents the luminous flux of the light emitting section that passes through one of the focal points, which is the dust detection section, from being directed to the other focal point, and an introduction that guides gas to the dust detection section. The main feature is that the introduction part and the discharge part are located opposite to each other across the focal point of the dust detection part. The light flux suppressing means includes a lens disposed between the light emitting section and one focus, and a light flux that has passed through the lens and the one focus, and reflecting the light flux toward the light emitting section. and a concave reflecting mirror that refocuses the image on the light emitting surface of the light emitting section. A fourth feature is that the device includes a control means for controlling the amount of light emitted from the light emitting section according to the output of the means. [Effect 1 According to the present invention, when the particles in the dust detection section scatter the light flux from the light emitting section, this scattered light is spatially widely diffused, but this scattered light is concentrated on the light receiving section side by the reflective surface. Because of this, it is possible to perform detection with high sensitivity, and since stray light other than scattered light hardly enters the light receiving section, detection with high S/N can be performed. [Example] The present invention will be described in detail below based on illustrated examples. As shown in FIGS. 1 and 2, the dust detection device according to the present invention projects a luminous flux toward a dust detection section. A light emitting unit 1, a light receiving unit 2 that receives scattered light generated by the dust detection unit, an elliptical reflecting surface 3 having two focal points f, f2, and a light emitting unit 3 that faces the light emitting unit 1 and is projected from the light emitting unit 3. A reflecting mirror 4 that returns the emitted light flux to the light emitting section 1, and an introduction section 5 that introduces gas into the dust detection section.
, is formed as a discharge part 6 for discharging the gas that has entered the dust detection part. The reflecting surface 3 here has almost the same shape as the inner surface of a hemisphere obtained by dividing a hollow spheroid along the short axis plane, and the light emitting section 1 consisting of an infrared light emitting diode is formed on the short axis of the spheroid. It projects a light beam that passes through a focal point f1 that is parallel to the axial direction and is closer to the reflective surface 3, and the light receiving section 2 faces the reflective surface 3 to a focal point f7 that is farther from the reflective surface 3. It is arranged in The reflective surface 3 can be made highly sensitive by painting the inner surface of a hemisphere of a hollow spheroid with a glossy color that provides good reflection efficiency. The light flux emitted from the light emitting section 1 is focused on the focal point f1 by the lens 10, and is located at a position facing the light emitting section 10 across the focal point f, so that the focal point is at the focal point f1. By the concave reflecting mirror 4,
As the light flux returns to the light emitting section 1, it is re-imaged on the light emitting section 1. In other words, although in reality stray light is generated due to alignment errors and reflection by the lens 10, theoretically the light emitting unit 1 and the reflecting mirror 4
This means that light only travels back and forth between the two, and the amount of stray light generated is significantly lower than with general optical traps. On the other hand, the introduction part and the discharge part 6 are provided at positions facing each other across the focal point f1 in the short axis direction of the spheroid, and since the discharge part 6 is connected to a suction pump or the like, , the gas entering from the introduction part 5 crosses the focal point f1 and goes straight to the discharge part 6. In this example,
The light beam emitted by the light emitting unit 1 and the gas flow intersect at a focal point f in a plane perpendicular to the long sleeve direction of the elliptical rotating body. Now, in this dust detection device, the vicinity of the focal point f1 is the main dust detection section, and the fine particles shown as dots in Fig. 1, such as smoke particles that have flowed in with the gas, are at the focal point f1.
1, and if the light beam from the light emitting part 1 is scattered at this position, a part of the -order scattered light will directly reach the light receiving part 2.
At the same time, most of the light is reflected by the reflecting surface 3 and enters the light receiving section 2 located at the focal point f2. In addition, among the fine particles located outside the focal point f1, those located in the passage path of the light flux directly enter a part of the scattered light into the light receiving section 2, and direct the primary scattered light passing through the focal point f1 to the reflecting surface. 3 into the light receiving section 2. The smoke particles located outside the path of the light flux direct a part of the primary scattered light due to stray light toward the light receiving section 2, and act as a shield for the scattered light that should originally enter the light receiving section 2.
All of these are accompanied by modification and attenuation, and since a suction pump or the like is connected to the discharge section 6 to perform suction, smoke particles hardly spread outside the dust detection section. Therefore, it is not significant from a measurement point of view. In other words, the light scattered by the particles in the dust detection section is collected at the light receiving section 2 with high efficiency, and almost no disturbance light reaches the light receiving section 2, so the sensitivity for dust detection is extremely high. In addition to being good, the S/N ratio is also good. The optical Long-term stability of system sensitivity can be maintained. The reflective surface 3 may be formed as the inner surface of a completely hollow spheroid, as shown in FIG.
As shown in the figure, it may be formed as the inner surface of an elliptical cylinder. Furthermore, as shown in FIG. 5, two focal points f1.
It may constitute the reflective surface 3 provided with fz. As shown in FIG. 6, the light emitting section 1 and the introducing section 5 may be arranged at the same place. In this case, disturbance light does not enter the inside, and stable measurement is possible. Furthermore, the light emitting section 1 and the introduction section 5 or the discharge section 6 may be arranged at a position other than the reflecting surface 3, as shown in FIG. The direction is reflective surface 3 and light receiving part 2
It may be placed in a position that is in a direction other than . If the light emitting unit 1 projects a parallel light beam, there is no diffusion of the light beam, so the lens 10 is unnecessary, as shown in FIG. 9. 8 FIG. 10 shows an example of the external appearance, and FIG. An example of an electric circuit that can correct the amount of light emitted from the light emitting unit 1 is shown. To explain the above electric circuit, 11 in the figure is C15
This is an oscillation circuit that generates a sine wave of inωt, and this sine wave is power amplified by an amplifier 12 to sinusoidally modulate the amount of light emitted by the light emitting unit 1. On the other hand, the output of the light receiving section 2 is amplified by the amplifier 14, and then
The bandpass filter 15 cuts the DC component. Then, the phase-changed oscillation output of the oscillation circuit 11 and the output of the bandpass filter 15 are processed in a multiplier 16. That is, the output of the oscillation circuit 11 guided to the multiplier 16 is changed from C1sinωt to Cs1n(ω
t+β〉. Bandpass filter 15
Of the output of , the fundamental wave (ω/2π Hz) is C2sin
(If ω is 10α), the multiplication result is 0.5CIC2ic
os(β-a)-cos(2ωt+a+β)), that is, only for the in-phase component, o, sc + C2C(1
3 (βα), other frequency components become alternating signals, and the fundamental wave has twice the frequency. Therefore, the low-pass filter 1 receiving the output of the multiplier 16
By setting the corner frequency of 7 so that 2ω/2π is sufficiently attenuated and the low-frequency corner frequency of the bandpass filter 15 also sufficiently attenuated, only the received signal of the fundamental wave of ω/2π is set. can be selectively extracted as a DC component. Here, upon receiving the output level from the low-pass filter 17, the comparator 18 and the switching element sw
1. The amount of light emitted from the light emitting section 1 is controlled by sw2. In other words, when the light emitting surface of the light emitting unit 1 and the lens 10 are not dirty and the required amount of light is obtained, the comparator 1
Since the input level to 8 is higher than the predetermined level, the switching element SW2 is closed and the light emitting current is suppressed by the resistor R2, so the amount of light emitted is suppressed, but the light emitting part 1 light emitting surface or lens 10°
If the output of the comparator 18 becomes lower than a predetermined level due to dirt, the switching element SW closes and the normal current set by the resistor R flows through the light emitting section 1, and the suppression of the amount of light emission is released. . Therefore, even if performance deterioration occurs due to electrical disturbance or dirt, this is compensated for and stable dust detection can be performed. As shown in FIGS. 12 and 13, the reflecting mirror 4 is made semi-transparent, and a second light receiving section 22 is arranged behind the reflecting mirror 4 to reduce the amount of light passing through the semi-transparent reflecting mirror 4. The amount of light emitted from the light emitting section 1 is constantly monitored by detecting it with the second light receiving section 22, and the output of the second light receiving section 22 after passing through the amplifier 23 is inputted to the light amount control circuit 24 as a negative feedback signal. The light amount control circuit 24 may control the amount of light emitted from the light emitting section 1 through the light emitting element drive circuit 25 so that the amount of light received by the light receiving section 22 is always at a constant level.
以上のように本発明においては、粉塵検出部に光束を照
射する発光部と、粉塵検出部からの散乱光を受光する受
光部とを備えた粉塵検出装置において、楕円形反射面の
ように二つの焦点を備えるとともに一方の焦点位置に粉
塵検出部を、他方の焦点位置に受光部を位置させる反射
面と、粉塵検出部である上記一方の焦点を通過する発光
部の光束を他方の焦点に向けない光束抑制手段と、粉塵
検出部に気体を導く導入部と、この気体を排出する排出
部とを具備していることから、粉塵検出部に位置する粒
子が発光部からの光束を散乱させる時、この散乱光は空
間的にいったん広く拡散するが、反射面によってその殆
どが受光部に集められるために、感度のよい検出を行う
ことができるものであり、また散乱光以外の迷光が受光
部に入ることが殆どないために、Ｓ／Ｎの良い検出を行
うことができるものであって、簡単な構成ながら、高感
度な粉塵検出を行うことができ、低レベルの煙濃度の検
出が要求される家庭用のものとして。
満足な性能を発揮する。As described above, in the present invention, in a dust detection device including a light emitting part that irradiates a light beam to a dust detection part and a light reception part that receives scattered light from the dust detection part, two A reflective surface has two focal points, and a dust detection part is located at one focal position, and a light receiving part is located at the other focal position. Since it is equipped with a luminous flux suppression means that does not direct the light, an introduction section that guides gas to the dust detection section, and an exhaust section that discharges this gas, particles located at the dust detection section scatter the luminous flux from the light emitting section. At the time, this scattered light is once diffused spatially and widely, but since most of it is collected on the light receiving part by the reflective surface, it is possible to perform highly sensitive detection, and stray light other than the scattered light is This device is capable of detecting dust with a good signal-to-noise ratio because it hardly enters the air, and although it has a simple configuration, it can perform highly sensitive dust detection and can detect low-level smoke concentrations. As a required household item. Demonstrates satisfactory performance.
第１図は本発明一実施例の概略縦断面図、第２図は同上
の概略横断面図、第３図は同上の他例の概略縦断面図、
第４図は更に他例の部分斜視図、第５図は同上の別の例
の概略縦断面図、第６図は更に別の例の部分断面図、第
７図〜第９図は夫々異なる例を示す概略縦断面図、第１
０図は外観の一例を示す斜視図、第１１図は電気回路の
一例を示す回路図、第１２図は他の実施例の概略縦断面
図、第１３図は同上の部分電気回路図であって、１は発
光部、２は受光部、３は反射面、４は反射鏡、５は導入
部、６は排出部、ｆ、、ｆ２は焦点を示す。
代理人 弁理士 石 １）長 七
−ｃ′Ｊｍｖｕ＋ＩＩ＋０−
Ｎ）
第３図
第７図
第８図
第９図
第１０図
第１１図
第１２図FIG. 1 is a schematic vertical cross-sectional view of one embodiment of the present invention, FIG. 2 is a schematic cross-sectional view of the same, and FIG. 3 is a schematic vertical cross-sectional view of another example of the same.
FIG. 4 is a partial perspective view of yet another example, FIG. 5 is a schematic vertical sectional view of another example same as the above, FIG. 6 is a partial sectional view of still another example, and FIGS. 7 to 9 are different from each other. Schematic longitudinal section showing an example, 1st
Figure 0 is a perspective view showing an example of the external appearance, Figure 11 is a circuit diagram showing an example of an electric circuit, Figure 12 is a schematic vertical sectional view of another embodiment, and Figure 13 is a partial electric circuit diagram of the same example. 1 is a light emitting part, 2 is a light receiving part, 3 is a reflecting surface, 4 is a reflecting mirror, 5 is an introduction part, 6 is an ejection part, and f, , f2 are focal points. Agent Patent Attorney Ishi 1) Chief 7-c'Jmvu+II+0- N) Figure 3 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12
Claims (4)
部からの散乱光を受光する受光部とを備えた粉塵検出装
置において、楕円形反射面のように二つの焦点を備える
とともに一方の焦点位置に粉塵検出部を、他方の焦点位
置に受光部を位置させる反射面と、粉塵検出部である上
記一方の焦点を通過する発光部の光束を他方の焦点に向
けない光束抑制手段と、粉塵検出部に気体を導く導入部
と、この気体を排出する排出部とを具備していることを
特徴とする粉塵検出装置。(1) In a dust detection device equipped with a light emitting part that irradiates a light beam to a dust detection part and a light reception part that receives scattered light from the dust detection part, it has two focal points like an elliptical reflective surface, and one a reflective surface that positions a dust detection section at a focal position of the dust detection section and a light receiving section at the other focal position; and a luminous flux suppressing means that does not direct the luminous flux of the light emitting section that passes through one of the focal points, which is the dust detection section, toward the other focal point. 1. A dust detection device comprising: an introduction section that guides gas to a dust detection section; and a discharge section that discharges the gas.
をはさんで対向する位置に設けられていることを特徴と
する請求項１記載の粉塵検出装置。(2) The dust detection device according to claim 1, wherein the introduction section and the discharge section are provided at positions facing each other across the focal point of one of the dust detection sections.
されたレンズと、レンズ及び一方の焦点を通過した光束
を発光部に向けて反射して発光部の発光面に再結像させ
る凹面型の反射鏡とからなることを特徴とする請求項１
記載の粉塵検出装置。(3) The light flux suppressing means includes a lens disposed between the light emitting section and one focal point, and a light flux that has passed through the lens and one focal point, which is reflected toward the light emitting section and reconcentrated on the light emitting surface of the light emitting section. Claim 1 characterized by comprising a concave reflecting mirror that causes an image.
The dust detection device described.
とともに、この光量検出手段の出力に応じて発光部の発
光量を制御する制御手段を備えていることを特徴とする
請求項１記載の粉塵検出装置。(4) The device further comprises a light amount detection means for detecting the amount of light emitted from the light emitting section, and a control means for controlling the amount of light emitted from the light emitting section according to the output of the light amount detection means. dust detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10782490A JP3046610B2 (en) | 1990-04-24 | 1990-04-24 | Dust detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10782490A JP3046610B2 (en) | 1990-04-24 | 1990-04-24 | Dust detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH045797A true JPH045797A (en) | 1992-01-09 |
| JP3046610B2 JP3046610B2 (en) | 2000-05-29 |
Family
ID=14468969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10782490A Expired - Lifetime JP3046610B2 (en) | 1990-04-24 | 1990-04-24 | Dust detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3046610B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11503236A (en) * | 1995-04-06 | 1999-03-23 | アルファ・ラヴァル・アグリ・アクチボラゲット | Method and apparatus for quantitatively determining particles in fluid |
| JP2000206033A (en) * | 1999-01-07 | 2000-07-28 | Midori Anzen Co Ltd | Apparatus for measuring cigarette-smoke particle |
| JP2010020470A (en) * | 2008-07-09 | 2010-01-28 | New Cosmos Electric Corp | Photoelectric smoke sensor |
| JP2014006108A (en) * | 2012-06-22 | 2014-01-16 | Azbil Corp | Optical particle detection device and method for detecting particle |
| JPWO2013031016A1 (en) * | 2011-09-02 | 2015-03-23 | 日本フェンオール株式会社 | Suction smoke detection system |
| US9297753B2 (en) | 2011-08-29 | 2016-03-29 | Fenwal Controls Of Japan, Ltd. | Photoelectric smoke sensor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102158927B1 (en) * | 2019-01-09 | 2020-09-22 | 인천대학교 산학협력단 | Particle metering apparatus |
-
1990
- 1990-04-24 JP JP10782490A patent/JP3046610B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11503236A (en) * | 1995-04-06 | 1999-03-23 | アルファ・ラヴァル・アグリ・アクチボラゲット | Method and apparatus for quantitatively determining particles in fluid |
| JP2000206033A (en) * | 1999-01-07 | 2000-07-28 | Midori Anzen Co Ltd | Apparatus for measuring cigarette-smoke particle |
| JP2010020470A (en) * | 2008-07-09 | 2010-01-28 | New Cosmos Electric Corp | Photoelectric smoke sensor |
| US9297753B2 (en) | 2011-08-29 | 2016-03-29 | Fenwal Controls Of Japan, Ltd. | Photoelectric smoke sensor |
| JPWO2013031016A1 (en) * | 2011-09-02 | 2015-03-23 | 日本フェンオール株式会社 | Suction smoke detection system |
| US9574996B2 (en) | 2011-09-02 | 2017-02-21 | Fenwal Controls Of Japan, Ltd. | Suction-type smoke sensing system |
| JP2014006108A (en) * | 2012-06-22 | 2014-01-16 | Azbil Corp | Optical particle detection device and method for detecting particle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3046610B2 (en) | 2000-05-29 |
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