FR2431693A1 - Device for measuring size of particles in fluid medium - by scattering of light beam and measuring amplitude of detected pulse, used to monitor air pollution in shops - Google Patents

Device for measuring size of particles in fluid medium - by scattering of light beam and measuring amplitude of detected pulse, used to monitor air pollution in shops

Info

Publication number
FR2431693A1
FR2431693A1 FR7821165A FR7821165A FR2431693A1 FR 2431693 A1 FR2431693 A1 FR 2431693A1 FR 7821165 A FR7821165 A FR 7821165A FR 7821165 A FR7821165 A FR 7821165A FR 2431693 A1 FR2431693 A1 FR 2431693A1
Authority
FR
France
Prior art keywords
measuring
shops
light beam
air pollution
scattering
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
FR7821165A
Other languages
French (fr)
Other versions
FR2431693B1 (en
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.)
GRACHEV KONSTANTIN
Original Assignee
GRACHEV KONSTANTIN
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 GRACHEV KONSTANTIN filed Critical GRACHEV KONSTANTIN
Priority to FR7821165A priority Critical patent/FR2431693A1/en
Publication of FR2431693A1 publication Critical patent/FR2431693A1/en
Application granted granted Critical
Publication of FR2431693B1 publication Critical patent/FR2431693B1/fr
Granted 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
    • G01N21/4785—Standardising light scatter apparatus; Standards therefor

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

Particle sizes are measured by scattering light from a beam to impinge on a detector. The detector output is fed to a set of threshold devices each responsive to a predetermined pulse amplitude. Indicators are driven by counters fed from the output of these threshold devices. The instrument is periodically recalibrated by placing a rod in the light beam to simulate a particle of knwon size. The detector output during this calibration operation is fed to the threshold circuits to serve as the decision threshold. The instrument measures particles sizes in air to monitor air pollution in shops. The instrument is continuously self-calibrating.
FR7821165A 1978-07-17 1978-07-17 Device for measuring size of particles in fluid medium - by scattering of light beam and measuring amplitude of detected pulse, used to monitor air pollution in shops Granted FR2431693A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7821165A FR2431693A1 (en) 1978-07-17 1978-07-17 Device for measuring size of particles in fluid medium - by scattering of light beam and measuring amplitude of detected pulse, used to monitor air pollution in shops

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7821165A FR2431693A1 (en) 1978-07-17 1978-07-17 Device for measuring size of particles in fluid medium - by scattering of light beam and measuring amplitude of detected pulse, used to monitor air pollution in shops

Publications (2)

Publication Number Publication Date
FR2431693A1 true FR2431693A1 (en) 1980-02-15
FR2431693B1 FR2431693B1 (en) 1981-02-06

Family

ID=9210798

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7821165A Granted FR2431693A1 (en) 1978-07-17 1978-07-17 Device for measuring size of particles in fluid medium - by scattering of light beam and measuring amplitude of detected pulse, used to monitor air pollution in shops

Country Status (1)

Country Link
FR (1) FR2431693A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0590891A1 (en) * 1992-09-28 1994-04-06 Shimadzu Corporation Method and apparatus for estimating a mixing proportion of different powdery contents

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2999414A (en) * 1958-06-17 1961-09-12 American Cyanamid Co Light beam weakener
US3045123A (en) * 1960-10-14 1962-07-17 Joseph C Frommer Calibrating system for particle sensing machine
US3078756A (en) * 1956-06-04 1963-02-26 Phillips Petroleum Co Nephelometer and control system
US3240109A (en) * 1962-07-24 1966-03-15 Specialties Dev Corp Supervised apparatus for detecting suspended matter in fluids
GB1079929A (en) * 1964-11-13 1967-08-16 Radiovisor Parent Ltd Improvements in and relating to smoke detection devices
US3992102A (en) * 1974-04-17 1976-11-16 Hochiki Corporation Photoelectric smoke detector with means for adjusting the amount of light projected into the detection region

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3078756A (en) * 1956-06-04 1963-02-26 Phillips Petroleum Co Nephelometer and control system
US2999414A (en) * 1958-06-17 1961-09-12 American Cyanamid Co Light beam weakener
US3045123A (en) * 1960-10-14 1962-07-17 Joseph C Frommer Calibrating system for particle sensing machine
US3240109A (en) * 1962-07-24 1966-03-15 Specialties Dev Corp Supervised apparatus for detecting suspended matter in fluids
GB1079929A (en) * 1964-11-13 1967-08-16 Radiovisor Parent Ltd Improvements in and relating to smoke detection devices
US3992102A (en) * 1974-04-17 1976-11-16 Hochiki Corporation Photoelectric smoke detector with means for adjusting the amount of light projected into the detection region

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0590891A1 (en) * 1992-09-28 1994-04-06 Shimadzu Corporation Method and apparatus for estimating a mixing proportion of different powdery contents

Also Published As

Publication number Publication date
FR2431693B1 (en) 1981-02-06

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Legal Events

Date Code Title Description
ST Notification of lapse