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GB1497214A - Visibility measuring means - Google Patents

Visibility measuring means

Info

Publication number
GB1497214A
GB1497214A GB14134/75A GB1413475A GB1497214A GB 1497214 A GB1497214 A GB 1497214A GB 14134/75 A GB14134/75 A GB 14134/75A GB 1413475 A GB1413475 A GB 1413475A GB 1497214 A GB1497214 A GB 1497214A
Authority
GB
United Kingdom
Prior art keywords
source
reflectors
visibility
visible
radiation
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
GB14134/75A
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.)
ABB Norden Holding AB
Original Assignee
ASEA 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 ASEA AB filed Critical ASEA AB
Publication of GB1497214A publication Critical patent/GB1497214A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Health & Medical Sciences (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Chemical & Material Sciences (AREA)
  • Electromagnetism (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

1497214 Measuring visibility photoelectrically ASEA AB 7 April 1975 [8 April 1974] 14134/75 Heading G1A To measure visibility, radiation from a source is scanned across a set of angularly spaced reflectors placed at different distances from the source, and the reflected radiation is detected and thresholded to determine which reflectors are visible. In Fig. la radiation from source 10, e.g. a laser, is scanned over reflectors 11; the source includes a beamsplitter 14, Fig. 2a, so that reflected radiation can pass to a detector 15 via mirror 16, lens 17 and filter 18. The source 12 in Fig. 2 emits pulses under control of a clock 24 and a unit 23 which steps the optical transmitter/receiver unit 21 to perform the scan. When the unit 21 has been stepped to a position where it points towards one of the reflectors, a train of pulses is emitted by the source; the detector signal is also a series of pulses which are integrated and compared with a pre-set threshold at 19 to determine whether the reflector is visible or not. The number of the reflectors which are classified as visible is a measure of the visibility.
GB14134/75A 1974-04-08 1975-04-07 Visibility measuring means Expired GB1497214A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7404670A SE381108B (en) 1974-04-08 1974-04-08 SIGHT SATURATION DEVICE

Publications (1)

Publication Number Publication Date
GB1497214A true GB1497214A (en) 1978-01-05

Family

ID=20320751

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14134/75A Expired GB1497214A (en) 1974-04-08 1975-04-07 Visibility measuring means

Country Status (4)

Country Link
JP (1) JPS50137587A (en)
FR (1) FR2266895B1 (en)
GB (1) GB1497214A (en)
SE (1) SE381108B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5592157A (en) * 1992-10-05 1997-01-07 Leica Ag Relative visibility measuring process and device
CN102818771A (en) * 2011-11-30 2012-12-12 凯迈（洛阳）环测有限公司 Visibility standard device adopting absorptive optical filters
CN102928349A (en) * 2012-11-16 2013-02-13 北京敏视达雷达有限公司 Visibility measuring device, related components and visibility measuring method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE404848B (en) * 1976-11-03 1978-10-30 Asea Ab SIGHT SATURATION DEVICE
SE414231B (en) * 1977-11-18 1980-07-14 Asea Ab VIEW METERS WITH AT LEAST A METAL DRAW
JP6015296B2 (en) * 2012-09-26 2016-10-26 オムロン株式会社 Image processing apparatus, ambient environment estimation method, and ambient environment estimation program

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2029315A5 (en) * 1969-01-24 1970-10-16 Thomson Brandt Csf
US3784968A (en) * 1970-05-29 1974-01-08 J Brosow Navigation system
SE358478B (en) * 1970-11-16 1973-07-30 Asea Ab

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5592157A (en) * 1992-10-05 1997-01-07 Leica Ag Relative visibility measuring process and device
CN102818771A (en) * 2011-11-30 2012-12-12 凯迈（洛阳）环测有限公司 Visibility standard device adopting absorptive optical filters
CN102818771B (en) * 2011-11-30 2016-02-24 凯迈（洛阳）环测有限公司 A kind of visibility standards device adopting absorption-type optical filter
CN102928349A (en) * 2012-11-16 2013-02-13 北京敏视达雷达有限公司 Visibility measuring device, related components and visibility measuring method

Also Published As

Publication number Publication date
FR2266895B1 (en) 1980-10-03
DE2513061A1 (en) 1975-10-09
FR2266895A1 (en) 1975-10-31
SE381108B (en) 1975-11-24
DE2513061B2 (en) 1977-05-12
SE7404670L (en) 1975-10-09
JPS50137587A (en) 1975-10-31

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Legal Events

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