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GB1342266A - Aerosol detection - Google Patents

Aerosol detection

Info

Publication number
GB1342266A
GB1342266A GB3337871A GB3337871A GB1342266A GB 1342266 A GB1342266 A GB 1342266A GB 3337871 A GB3337871 A GB 3337871A GB 3337871 A GB3337871 A GB 3337871A GB 1342266 A GB1342266 A GB 1342266A
Authority
GB
United Kingdom
Prior art keywords
aerosol
photo
cell
polarizer
july
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
Application number
GB3337871A
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB1342266A publication Critical patent/GB1342266A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/01—Control of temperature without auxiliary power
    • G05D23/02—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature
    • G05D23/08—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature with bimetallic element
    • 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
    • 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
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details

Landscapes

  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Health & Medical Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Outer Garments And Coats (AREA)
  • Helmets And Other Head Coverings (AREA)

Abstract

1342266 Photo-electric aerosol detection TELEFONAKTIEBOLAGET L M ERICSSON 15 July 1971 [24 July 1970] 33378/71 Heading G1A In an aerosol detector including one measuring chamber 11 arranged for rapid and another 12 for slow entrance of aerosol from the surrounding air a photo-cell arrangement 51/52 receives radiation beams that have travelled through the respective chambers to produce a signal indicating comparative aerosol concentration in the two chambers. The light path from a constant or fluctuating source 3, e.g. a glow-lamp, halogen lamp, gaseous discharge tube or light-emitting diode, includes crossed polarizers 6, 7 and a photo-cell 5. In the absence of aerosol, plane-polarized light resulting from polarizer 6 does not pass through polarizer 7 and hence there is no photocell output. If an aerosol, caused e.g. by a fire in a building, enters the light path through apertures 2 in the casing, the polarization state of each beam is changed and some radiation falls on the photo-cell. The two beams terminate on respective concentrically-arranged photo-cells (51, 52) connected in a bridge Fig. 5 (not shown). An aerosol penetrates to the outer path more quickly than to the inner one (through openings 9) and hence the bridge becomes unbalanced. An alarm is actuated if the unbalance signal exceeds a pre-set threshold. A plurality of the aerosol detecting arrangements may be provided in a single building.
GB3337871A 1970-07-24 1971-07-15 Aerosol detection Expired GB1342266A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE10237/70A SE335080B (en) 1970-07-24 1970-07-24

Publications (1)

Publication Number Publication Date
GB1342266A true GB1342266A (en) 1974-01-03

Family

ID=20291970

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3337871A Expired GB1342266A (en) 1970-07-24 1971-07-15 Aerosol detection

Country Status (8)

Country Link
CH (1) CH539902A (en)
DE (1) DE2134563A1 (en)
DK (1) DK127616B (en)
FI (1) FI53521C (en)
FR (1) FR2104804B1 (en)
GB (1) GB1342266A (en)
NO (1) NO126936B (en)
SE (1) SE335080B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2272760A (en) * 1992-11-20 1994-05-25 Thorn Security Optical detection of combustion products
CN107991236A (en) * 2017-12-04 2018-05-04 华北电力大学（保定） Microbial aerosol detection device
CN114018853A (en) * 2021-11-24 2022-02-08 青岛崂应海纳光电环保集团有限公司 Photometer gas chamber and gas analysis module

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7604502L (en) * 1976-04-15 1977-10-16 Ericsson Telefon Ab L M OPTICAL FIRE DETECTOR
GB2005404A (en) * 1977-09-26 1979-04-19 Bendix Corp "Dust Monitor"

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE494410A (en) *
GB715519A (en) * 1952-08-13 1954-09-15 Kidde Walter Co Ltd Method and apparatus for detection of smoke

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2272760A (en) * 1992-11-20 1994-05-25 Thorn Security Optical detection of combustion products
CN107991236A (en) * 2017-12-04 2018-05-04 华北电力大学（保定） Microbial aerosol detection device
CN114018853A (en) * 2021-11-24 2022-02-08 青岛崂应海纳光电环保集团有限公司 Photometer gas chamber and gas analysis module
CN114018853B (en) * 2021-11-24 2024-03-26 青岛崂应海纳光电环保集团有限公司 Photometer air chamber and gas analysis module

Also Published As

Publication number Publication date
CH539902A (en) 1973-07-31
FI53521C (en) 1978-05-10
FI53521B (en) 1978-01-31
NO126936B (en) 1973-04-09
SE335080B (en) 1971-05-10
DK127616B (en) 1973-12-03
DE2134563A1 (en) 1972-01-27
FR2104804A1 (en) 1972-04-21
FR2104804B1 (en) 1975-07-11

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee