JP2585559B2 - Fire judgment device - Google Patents

Fire judgment device

Info

Publication number
JP2585559B2
JP2585559B2 JP61311235A JP31123586A JP2585559B2 JP 2585559 B2 JP2585559 B2 JP 2585559B2 JP 61311235 A JP61311235 A JP 61311235A JP 31123586 A JP31123586 A JP 31123586A JP 2585559 B2 JP2585559 B2 JP 2585559B2
Authority
JP
Japan
Prior art keywords
fire
light
output
wavelength
judging
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.)
Expired - Fee Related
Application number
JP61311235A
Other languages
Japanese (ja)
Other versions
JPS63167242A (en
Inventor
弘允 石井
隆 小野
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.)
Hochiki Corp
Original Assignee
Hochiki Corp
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 Hochiki Corp filed Critical Hochiki Corp
Priority to JP61311235A priority Critical patent/JP2585559B2/en
Publication of JPS63167242A publication Critical patent/JPS63167242A/en
Application granted granted Critical
Publication of JP2585559B2 publication Critical patent/JP2585559B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire-Detection Mechanisms (AREA)

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、複数の波長光の煙による受光出力の変化か
ら火災を判断するようにした火災判断装置に関する。
Description: TECHNICAL FIELD The present invention relates to a fire judging device for judging a fire from a change in a light receiving output due to smoke of a plurality of wavelengths of light.

(従来の技術) 従来、所謂減光式の煙感知器にあっては、発光素子か
らの光の煙による減衰光を受光素子で受光し、受光出力
が煙濃度に応じて予め定めた閾値以下となったときに火
災検出出力を生ずるようにしている。
(Prior Art) Conventionally, in a so-called dimming type smoke detector, attenuated light due to smoke of light from a light emitting element is received by a light receiving element, and a light receiving output is equal to or less than a predetermined threshold value according to smoke density. When this happens, a fire detection output is generated.

(発明が解決しようとする問題点) ところで従来の減光式煙感知器にあっては、発光素子
による光源波長帯域内に受光感度をもった受光素子を使
用しており、煙検出光の波長を得に考慮することなく、
煙による検出光の光量変化のみから火災を判断するよう
にしている。
(Problems to be Solved by the Invention) By the way, in the conventional dimming smoke detector, a light receiving element having a light receiving sensitivity within a light source wavelength band by the light emitting element is used, and the wavelength of the smoke detection light is used. Without taking into account
A fire is determined only from a change in the amount of detection light due to smoke.

そこで、本願発明者等にあっては、従来の減光式煙感
知器における煙検出光のの波長と煙による光量変化の間
に相関関係があるか否か火災実験を通じて解析を試みた
ところ、検出光の波長によって煙による光量変化に相違
を生ずるという知見を得るに至った。
Therefore, the inventors of the present application attempted to analyze through a fire experiment whether or not there is a correlation between the wavelength of smoke detection light and the change in the amount of light due to smoke in a conventional extinction smoke detector. It has been found that the change in the amount of light due to smoke varies depending on the wavelength of the detection light.

(問題点を解決するための手段) 本発明は、このような状況に鑑みてなされたもので、
煙検出光の波長と煙による光量変化との間の相関関係を
有効に利用して正確に火災を判断できるようにした火災
判断装置を提供することを目的とする。
(Means for Solving the Problems) The present invention has been made in view of such a situation,
An object of the present invention is to provide a fire judging device capable of accurately judging a fire by effectively utilizing a correlation between a wavelength of smoke detection light and a change in light amount due to smoke.

この目的を達成するために本発明にあっては、発光波
長が異なる少なくとも2種類以上の波長光を発光する発
光手段と、発光手段から発光された複数の波長光の煙濃
度に応じた減衰光を受光する受光手段と、受光手段から
の受光出力に基づき火災を判断する火災判断手段を有す
る火災判断装置に於いて、火災判断手段は、経過時間に
対する受光出力の変化パターンと、予め定めた火災発生
時の経過時間に対する受光出力の変化の基準パターンと
を波長毎に比較し、少くとも2種類の波長について基準
パターンとの対応関係が得られた時に火災と判断して出
力する第1比較部と、複数の受光出力を加算する加算手
段と、加算手段の加算出力と所定の閾値とを比較し、所
定の閾値レベル以下の加算出力が得られたときに火災と
判断して出力する第2の比較部と、第1の比較部および
第2の比較部の各火災判断出力が得られたときに、火災
検出信号を出力する火災出力部を設けるようにしたもの
である。
In order to achieve this object, according to the present invention, there is provided a light emitting unit that emits at least two types of light having different emission wavelengths, and an attenuated light according to a smoke density of the plurality of wavelengths emitted from the light emitting unit. And a fire determining means for determining a fire based on the received light output from the light receiving means, wherein the fire determining means includes a change pattern of the received light output with respect to an elapsed time and a predetermined fire. A first comparison unit that compares a reference pattern of a change in received light output with respect to an elapsed time at the time of occurrence for each wavelength, and determines that a fire has occurred when at least two types of wavelengths have a correspondence relationship with the reference pattern, and outputs the result; And an adding means for adding the plurality of light receiving outputs, and comparing the added output of the adding means with a predetermined threshold value, determining that a fire has occurred when an added output of a predetermined threshold level or less is obtained, and outputting the fire. A comparing unit for, when each fire determination output of the first comparison unit and the second comparing unit is obtained, is obtained by so providing the fire output unit for outputting a fire detection signal.

(作用) このような本発明の構成によれば、火災の進展に伴な
う煙濃度の増加に対し、例えば可視光領域の低い波長光
(例えば青)については、火災初期の段階で光量の時間
変化が大きく、時間が経過するつれて光量の時間変化が
少なくなり、一方、可視光領域の高い波長(例えば赤)
においては、火災初期の段階では光量の時間変化が少な
く、時間が経過するにつれて光量の時間変化が大きくな
る関係があることから、少なくとも異なる2種類以上波
長光による受光出力の時間変化を比較し、前述した所定
の相互関係が得られたときに火災と判断する。また各波
長の受光出力を演算した結果が所定値閾値レベル以下の
出力となったときも火災の判断するようにしたものであ
る。
(Operation) According to the configuration of the present invention, for example, with respect to an increase in smoke density due to the progress of fire, for example, light of low wavelength (for example, blue) in the visible light region has a light amount at an early stage of fire. The temporal change is large, and the temporal change of the light amount decreases as time elapses, while the high wavelength in the visible light region (for example, red)
In the early stage of the fire, the temporal change in the light amount is small, and the temporal change in the light amount is large as time passes. When the above-mentioned predetermined correlation is obtained, it is determined that a fire has occurred. In addition, a fire is also determined when the result of calculating the light receiving output of each wavelength is equal to or less than a predetermined threshold level.

(実施例) 第1図は本発明の一実施例を示した説明図である。(Embodiment) FIG. 1 is an explanatory view showing an embodiment of the present invention.

まず構成を説明すると、1は検煙室であり、外部から
の煙の流入を可能とするが外部からの光の入射は遮断す
るようにした、所謂ラビリンス構造を備えている。検煙
部1内には、この実施例にあっては、3つの発光素子2
B,2G,2Rが設置されており、例えば発光素子2Bは中心波
長450nmを持つ青色の光を発光し、また発光素子2Gは中
心波長550nmを持つ緑の光を発光し、更に発光素子2Rは
中心波長700nmを持つ赤色の光を発光する。これらの発
光素子2B,2G,2Rは発光駆動回路3により連続発光駆動、
若しくは間欠発光駆動されている。
First, the configuration will be described. Reference numeral 1 denotes a smoke detection chamber, which has a so-called labyrinth structure which allows the inflow of smoke from the outside but blocks the incidence of light from the outside. In this embodiment, three light emitting elements 2
B, 2G, 2R are installed, for example, the light emitting element 2B emits blue light having a center wavelength of 450 nm, the light emitting element 2G emits green light having a center wavelength of 550 nm, and further, the light emitting element 2R It emits red light with a center wavelength of 700 nm. These light emitting elements 2B, 2G, and 2R are driven by the light emission driving circuit 3 to continuously emit light.
Alternatively, it is driven intermittently.

発光素子2B,2G,2Rに対向する位置には、所定の検煙距
離を隔てて受光素子4B,4G,4Rが設置され、発光素子2B,2
G,2Rからの中心波長が異なる波長光の流入した煙による
減衰光の受光出力を生ずる。受光素子4B,4G,4Rの出力は
アンプ5B,5G,5Rで増幅された後、火災判断としての比較
部6に与えられている。
At positions facing the light emitting elements 2B, 2G, 2R, light receiving elements 4B, 4G, 4R are installed at a predetermined smoke detection distance, and the light emitting elements 2B, 2R
A light receiving output of attenuated light due to smoke in which light having different center wavelengths from G and 2R flows is generated. After the outputs of the light receiving elements 4B, 4G, 4R are amplified by the amplifiers 5B, 5G, 5R, they are given to a comparison unit 6 for judging a fire.

この比率比較部6における異なる3つの波長光の受光
出力に基づく火災判断の原理を説明すると次のようにな
る。
The principle of the fire judgment based on the light receiving outputs of the three different wavelength lights in the ratio comparing unit 6 will be described as follows.

第2図は380nm〜780nmとなる可視光領域において、略
フラットな分光特性を持った光源を使用し、各波長に対
する透過率の関係を火災発生からの時間変化をパラメー
タとして示した特性図である。
FIG. 2 is a characteristic diagram showing a relationship between transmittance with respect to each wavelength in a visible light region of 380 nm to 780 nm using a light source having a substantially flat spectral characteristic, with time change from a fire occurrence as a parameter. .

この第2図から明らかなように、火災初期の時刻t0
段階にあっては、煙の流入がほとんど無いことから透過
率は全可視光領域の波長においてフラットとなってお
り、火災発生からの時間経過に伴う時刻t1,t2,t3,t4に
おいて図示の変化を生ずる。
As is apparent from Figure 2, in the stage of a fire early time t 0, the transmittance since the smoke influx little has a flat at the wavelength of the entire visible light region, from the fire At the times t1, t2, t3, t4 with the passage of time.

即ち、火災の初期段階にあっては、低い波長域の透過
率の変化が大きく、一方、高い波長域については変化が
少ない。そして、火災が進展して時間が経過すると、逆
に低い波長域の透過率の変化が少なくなり、高い波長域
の透過率の変化が大きくなる関係が得られる。
That is, in the initial stage of a fire, the change in transmittance in a low wavelength range is large, while the change is small in a high wavelength range. Then, when the time elapses after the fire progresses, the change in the transmittance in the low wavelength range is reduced and the change in the transmittance in the high wavelength range is increased.

第3図は第2図における波長450nm(青)、500nm
(緑)、700nm(赤)における透過率の時間変化を取り
出して示したもので、低い波長域の青については曲線B
に示すように、火災の初期段階にあっては透過率の変化
が大きく、時間が経過する程透過率の変化が少なくな
り、一方、高い波長域の赤については曲線Rに示すよう
に、火災の初期段階では透過率の変化が少なく時間が経
過する程透過率の変化が大きくなる。更に、両者の間と
なる緑については、曲線Gに示すように、両者の略中間
となる透過率の時間変化を生ずる。
FIG. 3 shows wavelengths of 450 nm (blue) and 500 nm in FIG.
(Green) and 700 nm (Red) show the change over time in transmittance. For blue in the low wavelength range, curve B
As shown in the figure, in the initial stage of the fire, the change in the transmittance is large, and the change in the transmittance becomes small as time elapses. In the initial stage, the change in the transmittance is small and the change in the transmittance increases as the time elapses. Further, as for the green between the two, as shown by the curve G, a change in the transmittance with time, which is substantially intermediate between the two, occurs.

このような第2,3図に示した煙検出光の波長に対する
透過率の時間変化の相互関係から第1図に示した比率比
較部6が火災を判断するようになる。即ち、比率比較部
6は、例えば第3図の時間軸に示すように、所定のサン
プリング周期T毎にアンプ5B,5G,5Rを介して得られる各
波長毎の受光出力をサンプリングしており、このサンプ
リングデータから求められた各波長毎の受光出力の時間
変化率(傾き)が、例えば第3図に示すような予め設定
された火災判断特性に沿った変化を生じたとき、火災と
判断して火災判断出力を生ずるようになる。
The ratio comparison unit 6 shown in FIG. 1 judges a fire from the correlation of the time change of the transmittance with respect to the wavelength of the smoke detection light shown in FIGS. That is, the ratio comparing section 6 samples the received light output for each wavelength obtained through the amplifiers 5B, 5G, and 5R at a predetermined sampling period T, for example, as shown on the time axis of FIG. When the time change rate (slope) of the received light output for each wavelength obtained from the sampling data changes, for example, according to a preset fire judgment characteristic as shown in FIG. 3, it is judged that a fire has occurred. As a result, a fire judgment output is generated.

更に、第1図の実施例にあっては、アンプ5B,5G,5Rの
出力を加算器7で加算し、加算器7の加算出力を比較器
8に入力し、比較器8において基準電圧源9により設定
した所定の煙濃度に対応した閾値電圧以下となったとき
にHレベル出力を生ずるようにしており、比較比較部6
における異なる波長光による受光出力の時間変化の相互
関係に基づく火災判断の他に、受光レベルの変化から火
災を判断する手段を付加している。
Further, in the embodiment of FIG. 1, the outputs of the amplifiers 5B, 5G, and 5R are added by an adder 7, and the added output of the adder 7 is input to a comparator 8, which outputs a reference voltage source. 9 to generate an H-level output when the voltage falls below a threshold voltage corresponding to the predetermined smoke density.
In addition to the above, in addition to the fire judgment based on the interrelationship of the temporal change of the light reception output due to the different wavelength light, means for judging a fire from the change in the light reception level is added.

比率比較部6及び比較器8の出力は火災出力部10に与
えられており、火災出力部10は比率比較部6または比較
器8のいずれか一方の火災判断出力が得られたときに外
部に火災検出信号を出力するか、或いは両方の火災判断
出力が得られたときに外部に火災検出信号を出力するよ
うにしている。
The outputs of the ratio comparing unit 6 and the comparator 8 are given to a fire output unit 10, and the fire output unit 10 outputs to the outside when the fire judgment output of either the ratio comparing unit 6 or the comparator 8 is obtained. A fire detection signal is output, or a fire detection signal is output to the outside when both fire judgment outputs are obtained.

このような第1図の実施例にあっては、発光素子2B,2
G,2Rより波長が相異なる3つの波長光(青,緑,赤)を
発光して受光素子4B,4G,4Rのそれぞれで受光し、異なる
波長毎の受光出力の時間変化を比率比較部6において比
較して、第2,3図に示すような予め得られている各波長
毎に異なる受光出力の時間変化の相互関係が得られたと
きに火災と判断することができ、異なる2種類以上の波
長光に依存した受光出力の変化から火災の有無を判断す
るため、火災以外の原因となる煙草の煙等とは明確に区
別して、誤報を生ずることなく正確な火災判断を行なう
ことができる。
In the embodiment shown in FIG. 1, the light emitting elements 2B, 2B
Lights of three wavelengths (blue, green, red) having different wavelengths than G and 2R are emitted and received by the light receiving elements 4B, 4G and 4R, respectively, and the time change of the light receiving output for each different wavelength is compared by the ratio comparing unit 6 When the correlation of the time change of the received light output different for each wavelength obtained in advance as shown in FIGS. 2 and 3 is obtained, it can be determined that a fire has occurred. Since the presence or absence of a fire is determined from the change in the received light output depending on the wavelength of light, it is possible to make a clear distinction from cigarette smoke, which is a cause other than a fire, and make an accurate fire determination without generating false alarms. .

一方、比率比較部6による火災判断にあっては、各波
長毎の所定の時間変化の相互関係が得られるまでにある
程度の処理時間を有することから、急激な火災の進展に
ついては比較器8による受光レベルの低下から火災が判
断され、比率比較部6による火災判断を持たずに火災出
力部10より火災検出信号が外部に送出でき、火災判断の
信頼性を更に高めることができる。
On the other hand, in the fire judgment by the ratio comparing unit 6, since a certain processing time is required until a predetermined correlation of the time change for each wavelength is obtained, the rapid fire progress is determined by the comparator 8. A fire is determined from a decrease in the light receiving level, and a fire detection signal can be sent to the outside from the fire output unit 10 without having a fire determination by the ratio comparing unit 6, so that the reliability of the fire determination can be further enhanced.

第4図は第1図に示した検煙室1に設ける発光手段と
受光手段の他の実施例を示した説明図であり、この実施
例にあっては、発光素子2B,2G,2Rとして可視光領域でフ
ラットな分光特性を持つ同じ発光素子を使用し、発光素
子2B,2G,2Rの前面に特定の波長の光のみを透過するフィ
ルタ12B,12G,12Rを設けるようにしたことを特徴とす
る。即ち、フィルタ12Bは中心波長450nmを中心とした青
の光のみを透過し、フィルタ12Gは中心波長550nmの緑の
光のみを透過し、更にフィルタ12Rは中心波長700nmの赤
の光のみを透過するようにしている。勿論、フィルタ12
B,12G,12Rは発光素子2B,2G,2Rの前面に設ける代わり
に、受光素子4B,4G,4Rの前面に設け、検煙部を通った光
の中から青,緑,赤の光のみを取り出して受光素子4B,4
G,4Rに入射させるようにしてもよい。
FIG. 4 is an explanatory view showing another embodiment of the light emitting means and the light receiving means provided in the smoke detection chamber 1 shown in FIG. 1. In this embodiment, the light emitting elements 2B, 2G, and 2R are used. The same light-emitting element with flat spectral characteristics in the visible light region is used, and filters 12B, 12G, and 12R that transmit only light of a specific wavelength are provided in front of the light-emitting elements 2B, 2G, and 2R. And That is, the filter 12B transmits only blue light with a center wavelength of 450 nm, the filter 12G transmits only green light with a center wavelength of 550 nm, and the filter 12R transmits only red light with a center wavelength of 700 nm. Like that. Of course, filter 12
B, 12G, and 12R are provided in front of the light-receiving elements 4B, 4G, and 4R instead of being provided in front of the light-emitting elements 2B, 2G, and 2R, and only blue, green, and red light is selected from the light that has passed through the smoke detector. Take out the light receiving element 4B, 4
The light may be incident on G and 4R.

第5図は第1図の検煙室1に設けられる発光手段、及
び受光手段の他の実施例を示した説明図であり、この実
施例にあっては、発光素子2B,2G及び2Rは第1図の実施
例と同様、それぞれ青,緑,赤となる波長光を出力し、
これらの受光素子に対し可視光領域で均一な分光感度を
持つ受光素子4を設け、発光素子2B,2G,2Rの順に順次発
光駆動して異なる波長光を検煙領域を介して受光素子4
に入射させるようにしたことを特徴とする。
FIG. 5 is an explanatory view showing another embodiment of the light emitting means and the light receiving means provided in the smoke detection chamber 1 of FIG. 1. In this embodiment, the light emitting elements 2B, 2G and 2R are As in the embodiment of FIG. 1, blue, green and red wavelength lights are output, respectively.
A light-receiving element 4 having uniform spectral sensitivity in the visible light region is provided for these light-receiving elements, and light-emitting elements 2B, 2G, and 2R are sequentially driven to emit light to emit light of different wavelengths through the smoke detection area.
Characterized in that the light is made to enter.

更に、異なる2種類以上の波長光を発光する本発明の
発光素子としては、2色発光型の発光ダイオードを使用
することができる。例えば、赤と緑の2色発光ダイオー
ドにあっては、赤の発光駆動、緑の発光駆動、及び両方
の発光駆動による合成色となる3色の発光駆動をもって
3種類の異なる波長光の受光出力を得ることができる。
Further, as the light emitting element of the present invention that emits light of two or more different wavelengths, a two-color light emitting diode can be used. For example, in the case of a two-color light emitting diode of red and green, light emission output of three kinds of different wavelength light is performed by driving light emission of red, driving of light emission of green, and light emission driving of three colors to be a combined color by both light emission driving. Can be obtained.

尚、上記の実施例3種類の波長光による火災判断を例
にとったが、2種類またはそれ以上の適宜の波長光の種
類であっても良い。
In the above-described embodiment, the fire determination using three types of wavelength light is taken as an example. However, two or more types of appropriate wavelength light may be used.

(発明の効果) 以上説明してきたように本発明によれば、発光波長が
異なる少なくとも2種類以上の波長光を発光する発光手
段と、発光手段から発光された複数の波長光の煙濃度に
応じた減衰光を受光する受光手段と、受光手段からの受
光出力に基づき火災を判断する火災判断手段を有する火
災判断装置に於いて、火災判断手段は、経過時間に対す
る受光出力の変化パターンと、予め定めた火災発生時の
経過時間に対する受光出力の変化の基準パターンとを波
長毎に比較し、少くとも2種類の波長について基準パタ
ーンとの対応関係が得られた時に火災と判断して出力す
る第1比較部と、複数の受光出力を加算する加算手段
と、加算手段の加算出力と所定の閾値とを比較し、所定
の閾値レベル以下の加算出力が得られたときに火災と判
断して出力する第2の比較部と、第1の比較部および又
は第2の比較部の各火災判断出力が得られたときに、火
災検出信号を出力する火災出力部を有するため、第1の
比較部によって火災時のみ生ずる異なる波長光の煙によ
る光量変化の時間変化の相違を捉えて火災と判断すると
ともに、第1の比較部又は第2の比較部の火災判断出力
で火災検出信号を送出する場合には、急激な火災の進展
については、第2の比較部による受光レベルの低下から
火災が判断され、第1の比較部による火災判断を待たず
に火災検出信号を外部に送出でき、火災判断の信頼性を
更に向上させることが可能であることから、より正確な
火災判断を行なうことができ、火災判断の信頼性を大幅
に向上することができる。
(Effects of the Invention) As described above, according to the present invention, a light emitting unit that emits light of at least two or more wavelengths having different emission wavelengths and a smoke density of a plurality of wavelength lights emitted from the light emitting unit are provided. A fire detecting means having a light receiving means for receiving the attenuated light and a fire judging means for judging a fire based on a light receiving output from the light receiving means. The reference pattern of the change of the received light output with respect to the elapsed time at the time of the determined fire is compared for each wavelength, and when at least two types of wavelengths have a correspondence relationship with the reference pattern, it is determined to be a fire and output. One comparing unit, an adding means for adding a plurality of light-receiving outputs, and comparing the added output of the adding means with a predetermined threshold, and determining that a fire has occurred when an added output equal to or less than a predetermined threshold level is obtained. A first comparison unit that outputs a fire detection signal when each fire judgment output of the first comparison unit and / or the second comparison unit is obtained. The unit detects the difference in the time variation of the light amount change due to smoke of different wavelength light generated only at the time of a fire, determines that the fire has occurred, and sends out a fire detection signal with the fire determination output of the first comparison unit or the second comparison unit. In such a case, a rapid fire progress can be judged based on a decrease in the light receiving level by the second comparing section, and a fire detection signal can be sent to the outside without waiting for the first comparing section to judge the fire. Since the reliability of the determination can be further improved, a more accurate fire determination can be made, and the reliability of the fire determination can be greatly improved.

【図面の簡単な説明】[Brief description of the drawings]

第1図は本発明の一実施例を示した説明図、第2図は煙
検出光の波長に対する透過率の変化を経過時間をパラメ
ータとして示した特性図、第3図は第2図に基づいて得
られた青、緑、赤の煙検出光の透過率の時間変化を示し
た特性図、第4,5図は本発明で用いる発光手段と受光手
段の他の実施例を示した説明図である。 1:検煙室 2B,2G,2R:発光素子 3:発光駆動回路 4,4B,4G,4R:受光素子 5B,5G,5R:アンプ 6:比率比較部 7:加算器 8:比較器 9:基準電圧源 10:火災出力部 12B,12G,12R:フィルタ
FIG. 1 is an explanatory diagram showing an embodiment of the present invention, FIG. 2 is a characteristic diagram showing a change in transmittance with respect to the wavelength of smoke detection light using elapsed time as a parameter, and FIG. 3 is based on FIG. FIG. 4 is a characteristic diagram showing the time change of the transmittance of the blue, green, and red smoke detection light obtained by the method. FIGS. 4 and 5 are explanatory diagrams showing another embodiment of the light emitting unit and the light receiving unit used in the present invention. It is. 1: Smoke detection room 2B, 2G, 2R: Light emitting element 3: Light emitting drive circuit 4, 4B, 4G, 4R: Light receiving element 5B, 5G, 5R: Amplifier 6: Ratio comparator 7: Adder 8: Comparator 9: Reference voltage source 10: Fire output section 12B, 12G, 12R: Filter

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭57−128831(JP,A) 特開 昭58−78290(JP,A) ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-57-128831 (JP, A) JP-A-58-78290 (JP, A)

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】発光波長が異なる少なくとも2種類以上の
波長光を発光する発光手段と、該発光手段から発光され
た複数の波長光の煙濃度に応じた減衰光を受光する受光
手段と、該受光手段からの受光出力に基づき火災を判断
する火災判断手段を有する火災判断装置に於いて、 前記火災判断手段は、 経過時間に対する前記受光出力の変化パターンと、予め
定めた火災発生時の経過時間に対する前記受光出力の変
化の基準パターンとを波長毎に比較し、少くとも2種類
の波長について基準パターンとの対応関係が得られた時
に火災と判断して出力する第1比較部と、 前記複数の受光出力を加算する加算手段と、 前記加算手段の加算出力と所定の閾値とを比較し、所定
の閾値レベル以下の加算出力が得られたときに火災と判
断して出力する第2の比較部と、 前記第1の比較部および第2の比較部の各火災判断出力
が得られたときに、火災検出信号を出力する火災出力部
と、 を有することを特徴とする火災判断装置。
A light-emitting means for emitting at least two types of wavelength lights having different emission wavelengths; a light-receiving means for receiving attenuated light corresponding to a smoke density of a plurality of wavelength lights emitted from the light-emitting means; In a fire judging device having fire judging means for judging a fire based on a light receiving output from a light receiving means, the fire judging means comprises: a change pattern of the light receiving output with respect to an elapsed time; and a predetermined elapsed time when a fire occurs. A first comparison unit that compares a reference pattern of the change of the received light output with respect to each wavelength for each wavelength, and determines that a fire has occurred when a correspondence relationship with the reference pattern is obtained for at least two wavelengths; An adding means for adding the received light output of the second means, and comparing the added output of the adding means with a predetermined threshold value, determining that a fire has occurred when an added output equal to or less than a predetermined threshold level is obtained, and outputting a second signal. A fire judging device comprising: a comparing unit; and a fire output unit that outputs a fire detection signal when each of the fire judging outputs of the first comparing unit and the second comparing unit is obtained.
【請求項2】発光波長が異なる少なくとも2種類以上の
波長光を発光する発光手段と、該発光手段から発光され
た複数の波長光の煙濃度に応じた減衰光を受光する受光
手段と、該受光手段からの受光出力に基づき火災を判断
する火災判断手段を有する火災判断装置に於いて、 前記火災判断手段は、 経過時間に対する前記受光出力の変化パターンと、予め
定めた火災発生時の経過時間に対する前記受光出力の変
化の基準パターンとを波長毎に比較し、少くとも2種類
の波長について基準パターンとの対応関係が得られた時
に火災と判断して出力する第1比較部と、 前記複数の受光出力を加算する加算手段と、 前記加算手段の加算出力と所定の閾値とを比較し、所定
の閾値レベル以下の加算出力が得られたときに火災と判
断して出力する第2の比較部と、 前記第1の比較部および第2の比較部の各火災判断出力
が得られたときに、火災検出信号を出力する火災出力部
と、 を有することを特徴とする火災判断装置。
2. A light emitting means for emitting at least two kinds of wavelength light having different emission wavelengths; a light receiving means for receiving attenuated light corresponding to a smoke density of a plurality of wavelength lights emitted from the light emitting means; In a fire judging device having fire judging means for judging a fire based on a light receiving output from a light receiving means, the fire judging means comprises: a change pattern of the light receiving output with respect to an elapsed time; and a predetermined elapsed time when a fire occurs. A first comparison unit that compares a reference pattern of the change of the received light output with respect to each wavelength for each wavelength, and determines that a fire has occurred when a correspondence relationship with the reference pattern is obtained for at least two wavelengths; An adding means for adding the received light output of the second means, and comparing the added output of the adding means with a predetermined threshold value, determining that a fire has occurred when an added output equal to or less than a predetermined threshold level is obtained, and outputting a second signal. A fire judging device comprising: a comparing unit; and a fire output unit that outputs a fire detection signal when each of the fire judging outputs of the first comparing unit and the second comparing unit is obtained.
JP61311235A 1986-12-27 1986-12-27 Fire judgment device Expired - Fee Related JP2585559B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61311235A JP2585559B2 (en) 1986-12-27 1986-12-27 Fire judgment device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61311235A JP2585559B2 (en) 1986-12-27 1986-12-27 Fire judgment device

Publications (2)

Publication Number Publication Date
JPS63167242A JPS63167242A (en) 1988-07-11
JP2585559B2 true JP2585559B2 (en) 1997-02-26

Family

ID=18014716

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61311235A Expired - Fee Related JP2585559B2 (en) 1986-12-27 1986-12-27 Fire judgment device

Country Status (1)

Country Link
JP (1) JP2585559B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111919240B (en) * 2018-03-28 2022-12-09 报知希株式会社 Fire detection device
WO2020026589A1 (en) 2018-07-31 2020-02-06 日本電気株式会社 Receiver, fire detection system, and fire detection method
JP7453764B2 (en) * 2019-09-12 2024-03-21 能美防災株式会社 Separate fire detector

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3175819D1 (en) * 1980-12-18 1987-02-12 Cerberus Ag Smoke detector according to the radiation extinction principle

Also Published As

Publication number Publication date
JPS63167242A (en) 1988-07-11

Similar Documents

Publication Publication Date Title
CN109601019B (en) Method for fire detection based on the scattered light principle and scattered light smoke alarm
US8947243B2 (en) Smoke detector with external sampling volume and utilizing internally reflected light
US7474227B2 (en) Multiwavelength smoke detector using white light LED
EP2336993B1 (en) Smoke detector
JPH06109631A (en) Fire alarm
JP2585559B2 (en) Fire judgment device
FR2526565A1 (en) FIRE AND EXPLOSION DETECTOR
JP3035341B2 (en) smoke detector
JP2761083B2 (en) Multi-wavelength extinction smoke detector
JP2966541B2 (en) Photoelectric smoke detector
JPS6132195A (en) Fire sensor
JP2552148B2 (en) Fire detection method and device
JPH05128381A (en) Fire alarm device
JP2553806B2 (en) Photoelectric switch
EP1810259A1 (en) Multiwavelength smoke detector using white light led
JP7397934B2 (en) photoelectric smoke detector
JP2539948B2 (en) Dimming type smoke detector
CN220189073U (en) Symmetrical multi-light path smoke detection labyrinth and photoelectric smoke sensing fire detection alarm
RU2765803C1 (en) Method for detecting smoke and flame in the visible wavelength range
JP3023260B2 (en) Weft detection device for loom
KR20050095441A (en) Infrared detector and control method thereof
JP2022097329A (en) Fire detection device, disaster prevention facility, and fire detection method
JP3319344B2 (en) Smoke detector and smoke detection system
JPH0964713A (en) Touch key
JPH06132802A (en) Multiple optical axis photoelectric switch

Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees