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GB1304258A - - Google Patents

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Publication number
GB1304258A
GB1304258A GB1304258DA GB1304258A GB 1304258 A GB1304258 A GB 1304258A GB 1304258D A GB1304258D A GB 1304258DA GB 1304258 A GB1304258 A GB 1304258A
Authority
GB
United Kingdom
Prior art keywords
light
photo
beams
visibility
region
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
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 filed Critical
Publication of GB1304258A publication Critical patent/GB1304258A/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
    • G01N21/538—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke for determining atmospheric attenuation and visibility

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)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

1304258 Measuring visibility photo-electrically UNITED KINGDOM ATOMIC ENERGY AUTHORITY 4 Oct 1971 [3 July 1970] 32497/70 Heading G1A In an apparatus for providing an indication of visibility along a predetermined path defined by a first light beam 12, a second light beam 15 is arranged to intersect or pass close to the first beam at a region P and the light scattered from the two beams substantially from the region P is detected by at least one photo-cell D. By distinguishing between and comparing the photosignals due to the two light beams the visibility along the path can be determined. To distinguish between the beams either the laser sources 16, 17 are modulated or mechanical shoppers are provided in the beam paths. One or more silicon photo-cells D, each provided with a telescope 13, receive the scattered light.
GB1304258D 1970-07-03 1970-07-03 Expired GB1304258A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3249770 1970-07-03

Publications (1)

Publication Number Publication Date
GB1304258A true GB1304258A (en) 1973-01-24

Family

ID=10339514

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1304258D Expired GB1304258A (en) 1970-07-03 1970-07-03

Country Status (1)

Country Link
GB (1) GB1304258A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102621101A (en) * 2012-01-08 2012-08-01 杨少辰 Laser visibility meter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102621101A (en) * 2012-01-08 2012-08-01 杨少辰 Laser visibility meter

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees