EP0418410A1 - Méthode et appareil pour compenser l'humidité de l'air dans un détecteur de fumée - Google Patents

Méthode et appareil pour compenser l'humidité de l'air dans un détecteur de fumée Download PDF

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Publication number
EP0418410A1
EP0418410A1 EP89117328A EP89117328A EP0418410A1 EP 0418410 A1 EP0418410 A1 EP 0418410A1 EP 89117328 A EP89117328 A EP 89117328A EP 89117328 A EP89117328 A EP 89117328A EP 0418410 A1 EP0418410 A1 EP 0418410A1
Authority
EP
European Patent Office
Prior art keywords
smoke density
humidity
measured value
smoke
measured
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
EP89117328A
Other languages
German (de)
English (en)
Other versions
EP0418410B1 (fr
Inventor
Helfried Dipl.-Ing. Lappe
Otfried Dipl.-Ing. Post
Peer Dr.-Ing. Thilo
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.)
Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to AT89117328T priority Critical patent/ATE111246T1/de
Priority to DE58908329T priority patent/DE58908329D1/de
Priority to EP89117328A priority patent/EP0418410B1/fr
Priority to ES89117328T priority patent/ES2061859T3/es
Publication of EP0418410A1 publication Critical patent/EP0418410A1/fr
Application granted granted Critical
Publication of EP0418410B1 publication Critical patent/EP0418410B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/20—Calibration, including self-calibrating arrangements
    • G08B29/24—Self-calibration, e.g. compensating for environmental drift or ageing of components
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke

Definitions

  • the invention relates to a method for compensating the air humidity in an optical smoke detector, which is formed by a scattered light detector with an optical measuring chamber and a light transmitter and receiver, the light of the light transmitter being scattered by smoke particles that have penetrated into the measuring chamber and onto the light receiver falls, whose output signal forms a measured value for the fire parameter smoke density, which is used for alarm generation, in a fire alarm system with a control center and primary alarm lines to which the scattered light detectors are connected, and to a device for carrying out the method.
  • the optical smoke detectors used today e.g. backward scattering smoke detectors are excellent early warning devices for fires with smoke development, e.g. Smoldering fires. But when used in rooms with high humidity, undesirable high false alarm rates occur due to condensation in the detector. Although the backward scattering optical smoke detectors have very good detection properties, they also react disadvantageously to water vapor or small water droplets, because the scattered light detectors can penetrate water vapor, e.g. Fog or condensation, no distinction from smoke.
  • Scattered light smoke detectors in offices and laboratories can be fooled, for example, by boiling water (coffee machine).
  • scattered-light smoke detectors in underground garages are deceived by climatic influences such as changes in weather, fog, snow-covered vehicles and starting cars (water vapor).
  • the object of the invention is to use optical smoke detectors, in particular with scattered-light smoke detectors, to detect damage fire as early as before, but to avoid false alarms due to condensation in order to increase alarm security.
  • the ambient parameter relative air humidity is measured with a humidity sensor arranged in the measuring chamber, and a moisture measurement value is determined from the measured relative humidity by means of a linearized measuring device that is above a certain measured value for the relative air humidity, the smoke density measurement value is compensated with the moisture measurement value, and that the compensated smoke density measurement value is further processed to form alarm criteria.
  • an intelligent microprocessor-based multi-sensor circuit periodically records the fire parameter smoke or smoke density and the ambient parameter relative air humidity.
  • the smoke density is measured using a scattered light detector based on the principle of optical backscattering.
  • the relative air humidity is measured with a humidity sensor, which is installed in the measuring chamber of the scattered light detector.
  • this measured relative humidity becomes a humidity Measured value determined, which is used above a certain measured value for the relative air humidity to compensate for the smoke density measured value.
  • the compensated smoke density measured value is processed further to form alarm criteria.
  • the smoke density measurement value and the moisture measurement value can be sent periodically to the fire control center via the connected primary signal line, so that the moisture compensation of the smoke density measurement value is carried out in the control center. It is also possible to compensate for the moisture of the smoke quantity in the scattered light detector itself. The detector then sends the compensated smoke density measurement to the fire alarm control panel via the connected primary signal line.
  • the known pulse reporting method based on the principle of chain synchronization can be used as a basis for the transmission of the measured values.
  • a microcomputer is expediently provided for the measurement value acquisition, processing and transmission in the scattered light smoke detector.
  • the stray light detector has a transmitter circuit which controls the light transmitter, a receiver circuit which converts the receiver current of the light receiver into a frequency change, and an oscillator circuit which Converts measurement signals of the moisture sensor into frequency-analog signals, and has a microcomputer, which measures the frequency change of the light receiver during a quartz-stable gate time and stores it as a smoke density measurement signal, and measures the frequency-analog signals of the moisture sensor and uses this to determine the value of the relative air humidity via a linearization table in the read-only memory and as a Stores measured moisture value, and which controls the transmitter circuit, and that the microcomputer compensates the measured smoke density value with the measured moisture value and outputs the compensated measured smoke density value to the primary signal line.
  • the invention is briefly explained using a drawing.
  • the only figure shows the principle of a moisture-compensated scattered light smoke detector.
  • a scattered light smoke detector SM which has an optical measuring chamber MK (labyrinth).
  • the light emitted by a light transmitter LS for example an IR LED, radiates into this measuring chamber MK. If smoke particles RP or water droplets WT enter the measuring chamber MK, the light from the light transmitter LS is scattered (backwards) and the light receiver LE, for example a photodiode, receives the scattered light.
  • a moisture sensor FS which can be formed by a variable capacitance, is arranged in the measuring chamber MK.
  • the scattered light detector SM is connected to the central station Z via a primary signal line ML (two-wire: a, b).
  • the scattered light detector SM has a microcomputer ⁇ R, which carries out the measured value acquisition, measured value preparation and measured value processing.
  • the microcomputer ⁇ R controls the light transmitter LS via a transmission circuit S-Sch.
  • the smoke density is measured with the scattered light detector based on the principle of optical backscattering.
  • the photodiode receives the scattered light and gives a current, which corresponds to the smoke density, to the receiver circuit ESch, which changes the receiver current into one Frequency change implemented, which is measured by the microcomputer ⁇ R during a quartz-stable gate time and stored as smoke density measurement MWR.
  • the moisture sensor FS is used to detect the relative air humidity F and is formed by a capacitance that generates a frequency-analog signal with the aid of an oscillator circuit OSZ.
  • the microcomputer ⁇ R also measures this frequency during a quartz-stable gate time and uses it to determine the value of the relative air humidity from a linearization table that is stored in a read-only memory and stores it as a moisture measurement value MWF.
  • the smoke density measurement value and the moisture measurement value can be sent periodically to the fire alarm center Z via the connected primary detector line ML. There the moisture compensation of the smoke measurement MWR can be carried out. In this exemplary embodiment, the moisture compensation of the smoke measurement variable takes place in the scattered light detector SM itself. The scattered light detector then outputs the compensated smoke density measurement value KMWR to the fire control center Z via the connected primary signal line.
  • the influence of the relative air humidity on the smoke density measurement value of an optical scattered light detector is the same for all optical smoke detectors and is therefore only recorded once in a climatic chamber.
  • the compensation specification is then either available as an algorithm or preferably in tabular form and is stored as a conversion table in a read-only memory (e.g. EPROM).
  • the regulation on moisture compensation takes into account the relationship between the relative air humidity and the uncompensated smoke detector measured value described above in such a way that the formation of water droplets is recognized and the resulting light reflection does not lead to a reduction in the smoke detector measured value.
  • the measured smoke density value is compensated and the compensated measured smoke density value is further processed for alarm generation.
  • the method of moisture compensation according to the invention ensures that the optical smoke detector detects smoke particles that have penetrated even with high relative atmospheric humidity with constant sensitivity.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire-Detection Mechanisms (AREA)
EP89117328A 1989-09-19 1989-09-19 Méthode et appareil pour compenser l'humidité de l'air dans un détecteur de fumée Expired - Lifetime EP0418410B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT89117328T ATE111246T1 (de) 1989-09-19 1989-09-19 Verfahren und vorrichtung zur kompensation der luftfeuchtigkeit in einem optischen rauchmelder.
DE58908329T DE58908329D1 (de) 1989-09-19 1989-09-19 Verfahren und Vorrichtung zur Kompensation der Luftfeuchtigkeit in einem optischen Rauchmelder.
EP89117328A EP0418410B1 (fr) 1989-09-19 1989-09-19 Méthode et appareil pour compenser l'humidité de l'air dans un détecteur de fumée
ES89117328T ES2061859T3 (es) 1989-09-19 1989-09-19 Procedimiento y dispositivo para la compensacion de la humedad del aire en un avisador de humos optico.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89117328A EP0418410B1 (fr) 1989-09-19 1989-09-19 Méthode et appareil pour compenser l'humidité de l'air dans un détecteur de fumée

Publications (2)

Publication Number Publication Date
EP0418410A1 true EP0418410A1 (fr) 1991-03-27
EP0418410B1 EP0418410B1 (fr) 1994-09-07

Family

ID=8201906

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89117328A Expired - Lifetime EP0418410B1 (fr) 1989-09-19 1989-09-19 Méthode et appareil pour compenser l'humidité de l'air dans un détecteur de fumée

Country Status (4)

Country Link
EP (1) EP0418410B1 (fr)
AT (1) ATE111246T1 (fr)
DE (1) DE58908329D1 (fr)
ES (1) ES2061859T3 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4307585C1 (de) * 1993-03-10 1994-03-10 Siemens Ag Verfahren und Vorrichtung zur Kompensation der Feuchtigkeit in einem Streulichtmelder
EP0911774A2 (fr) * 1997-10-21 1999-04-28 Siemens Aktiengesellschaft Capteur pour la surveillance d'un espace
EP1540615A2 (fr) * 2002-09-19 2005-06-15 Pittway Corporation Detecteur equipe d'un capteur de photons ambiant ainsi que d'autres capteurs
EP1732049A1 (fr) * 2005-06-10 2006-12-13 Siemens S.A.S. Détecteur de feux ou de fumée à haute rejection de fausses alarmes
US7642924B2 (en) 2007-03-02 2010-01-05 Walter Kidde Portable Equipment, Inc. Alarm with CO and smoke sensors
CN111540159A (zh) * 2020-05-27 2020-08-14 深圳市泛海三江电子股份有限公司 一种可定向排除凝露干扰的烟雾报警器及使用方法
CN111540158A (zh) * 2020-05-27 2020-08-14 深圳市泛海三江电子股份有限公司 一种带有凝露识别功能的烟感报警器及使用方法
CN111564019A (zh) * 2020-05-27 2020-08-21 深圳市泛海三江电子股份有限公司 一种抗凝露干扰的感烟火灾探测器及使用方法
CN111627182A (zh) * 2020-05-27 2020-09-04 深圳市泛海三江电子股份有限公司 一种带独立式凝露识别仓的烟雾感应器及使用方法
CN112907884A (zh) * 2021-04-20 2021-06-04 无锡商业职业技术学院 一种低误报率的烟雾探测方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004020489B4 (de) * 2004-04-26 2007-06-28 Minimax Gmbh & Co. Kg Brandmelder für Einsatz in Außenatmosphäre
DE102004032294B4 (de) * 2004-07-03 2012-02-09 Minimax Gmbh & Co. Kg Beheizter Brandmelder
EP3704679A1 (fr) 2017-10-30 2020-09-09 Carrier Corporation Compensateur dans un dispositif détecteur

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3244878A1 (de) * 1981-12-09 1983-06-16 The Bendix Corp., 48076 Southfield, Mich. Meldeeinrichtung fuer brennbare gase
EP0125485A1 (fr) * 1983-04-12 1984-11-21 Siemens Aktiengesellschaft Aménagement de circuits pour supprimer des signaux dans des détecteurs de fumée
DE3507344A1 (de) * 1984-03-05 1985-09-12 Hochiki Corp., Tokio/Tokyo Photoelektrischer rauchsensor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3244878A1 (de) * 1981-12-09 1983-06-16 The Bendix Corp., 48076 Southfield, Mich. Meldeeinrichtung fuer brennbare gase
EP0125485A1 (fr) * 1983-04-12 1984-11-21 Siemens Aktiengesellschaft Aménagement de circuits pour supprimer des signaux dans des détecteurs de fumée
DE3507344A1 (de) * 1984-03-05 1985-09-12 Hochiki Corp., Tokio/Tokyo Photoelektrischer rauchsensor

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 6, Nr. 237 (P-157), 25. November 1982; & JP-A-57 136 155 (MATSUSHITA DENKI SANGYO K.K.) 23-08-1982 *
PATENT ABSTRACTS OF JAPAN, Band 8, Nr. 051 (P-259), 8. März 1984; & JP-A-58 201 051 (MITSUBISHI JUKOGYO K.K.) 22-11-1983 *

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0615218A1 (fr) * 1993-03-10 1994-09-14 Siemens Aktiengesellschaft Procédé et dispositif pour la compensation de l'humidité dans un détecteur à dispersion de lumière
DE4307585C1 (de) * 1993-03-10 1994-03-10 Siemens Ag Verfahren und Vorrichtung zur Kompensation der Feuchtigkeit in einem Streulichtmelder
EP0911774A2 (fr) * 1997-10-21 1999-04-28 Siemens Aktiengesellschaft Capteur pour la surveillance d'un espace
EP0911774A3 (fr) * 1997-10-21 1999-12-15 Siemens Aktiengesellschaft Capteur pour la surveillance d'un espace
EP1540615A2 (fr) * 2002-09-19 2005-06-15 Pittway Corporation Detecteur equipe d'un capteur de photons ambiant ainsi que d'autres capteurs
EP1540615A4 (fr) * 2002-09-19 2009-08-05 Honeywell Int Inc Detecteur equipe d'un capteur de photons ambiant ainsi que d'autres capteurs
US7760102B2 (en) 2005-06-10 2010-07-20 Siemens Ag Fire or smoke detector with high false alarm rejection performance
EP1732049A1 (fr) * 2005-06-10 2006-12-13 Siemens S.A.S. Détecteur de feux ou de fumée à haute rejection de fausses alarmes
WO2006131204A1 (fr) * 2005-06-10 2006-12-14 Siemens S.A.S. Detecteur d'incendie ou de fumee a hautes capacites de rejet des fausses alarmes
US7642924B2 (en) 2007-03-02 2010-01-05 Walter Kidde Portable Equipment, Inc. Alarm with CO and smoke sensors
CN111540159A (zh) * 2020-05-27 2020-08-14 深圳市泛海三江电子股份有限公司 一种可定向排除凝露干扰的烟雾报警器及使用方法
CN111540158A (zh) * 2020-05-27 2020-08-14 深圳市泛海三江电子股份有限公司 一种带有凝露识别功能的烟感报警器及使用方法
CN111564019A (zh) * 2020-05-27 2020-08-21 深圳市泛海三江电子股份有限公司 一种抗凝露干扰的感烟火灾探测器及使用方法
CN111627182A (zh) * 2020-05-27 2020-09-04 深圳市泛海三江电子股份有限公司 一种带独立式凝露识别仓的烟雾感应器及使用方法
CN111627182B (zh) * 2020-05-27 2023-07-18 深圳市高新投三江电子股份有限公司 一种带独立式凝露识别仓的烟雾感应器及使用方法
CN111540159B (zh) * 2020-05-27 2023-07-25 深圳市高新投三江电子股份有限公司 一种可定向排除凝露干扰的烟雾报警器及使用方法
CN111540158B (zh) * 2020-05-27 2023-08-15 深圳市高新投三江电子股份有限公司 一种带有凝露识别功能的烟感报警器及使用方法
CN111564019B (zh) * 2020-05-27 2023-09-12 深圳市高新投三江电子股份有限公司 一种抗凝露干扰的感烟火灾探测器及使用方法
CN112907884A (zh) * 2021-04-20 2021-06-04 无锡商业职业技术学院 一种低误报率的烟雾探测方法

Also Published As

Publication number Publication date
EP0418410B1 (fr) 1994-09-07
ES2061859T3 (es) 1994-12-16
ATE111246T1 (de) 1994-09-15
DE58908329D1 (de) 1994-10-13

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