GB1216961A - Improved method and apparatus for detecting aerosols - Google Patents

Improved method and apparatus for detecting aerosols

Info

Publication number
GB1216961A
GB1216961A GB594569A GB594569A GB1216961A GB 1216961 A GB1216961 A GB 1216961A GB 594569 A GB594569 A GB 594569A GB 594569 A GB594569 A GB 594569A GB 1216961 A GB1216961 A GB 1216961A
Authority
GB
United Kingdom
Prior art keywords
smoke
electrodes
diode
feb
ionization chamber
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
GB594569A
Inventor
James Holden Burnett
Michael Suchomel
William Carl Tipton
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB1216961A publication Critical patent/GB1216961A/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
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G01N15/065—Investigating concentration of particle suspensions using condensation nuclei counters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
    • G01N27/68—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using electric discharge to ionise a gas
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T7/00—Details of radiation-measuring instruments
    • G01T7/12—Provision for actuation of an alarm
    • G01T7/125—Alarm- or controlling circuits using ionisation chambers, proportional counters or Geiger-Mueller tubes, also functioning as UV detectors

Abstract

1,216,961. Detecting aerosols. J. H. BURNETT, M. SUCHOMEL, AND W. C. TIPTON. Feb. 4, 1969 [Feb. 5, 1968], No. 5945/69. Heading G1N. [Also in Division G4] In a fire alarm, smoke is detected by an ionization chamber S1 having a pair of electrodes connected to a source of direct current, the voltage of which is stabilized by a Zener diode 1 to give a field strength of about 4 volts per cm. between the electrodes which is said to maximize the effect of smoke on the current through the electrodes. A second ionization chamber S2 having only a small opening to the air compensates for air pressure variations. When, due to the presence of smoke, the electrode current drops below a certain level a normally non-conducting unijunction transistor 9 is turned on to discharge capacitor 5 to trigger an S. C. R. 15 and thereby light lamp L1. Adjustable feedback to the field effect transistor 2 increases sensitivity. Diode 13 protects the circuit from incorrect supply polarity and diode 17 enables incorrect supply polarity to be indicated by lamp L1.
GB594569A 1968-02-05 1969-02-04 Improved method and apparatus for detecting aerosols Expired GB1216961A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US70288168A 1968-02-05 1968-02-05

Publications (1)

Publication Number Publication Date
GB1216961A true GB1216961A (en) 1970-12-23

Family

ID=24822975

Family Applications (1)

Application Number Title Priority Date Filing Date
GB594569A Expired GB1216961A (en) 1968-02-05 1969-02-04 Improved method and apparatus for detecting aerosols

Country Status (1)

Country Link
GB (1) GB1216961A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138570A (en) * 1983-04-19 1984-10-24 Emi Ltd Smoke detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138570A (en) * 1983-04-19 1984-10-24 Emi Ltd Smoke detector

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