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GB1227187A - - Google Patents

Info

Publication number
GB1227187A
GB1227187A GB1227187DA GB1227187A GB 1227187 A GB1227187 A GB 1227187A GB 1227187D A GB1227187D A GB 1227187DA GB 1227187 A GB1227187 A GB 1227187A
Authority
GB
United Kingdom
Prior art keywords
photo
cell
visibility
lamp
ultraviolet
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 GB1227187A publication Critical patent/GB1227187A/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
    • 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
    • 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)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Road Signs Or Road Markings (AREA)

Abstract

1,227,187. Visibility meters. F. FRUNGEL. Oct.1 1968 [Nov.3, 1967], No.46473/68. Heading G1A. A visibility meter comprises an ultraviolet transmitter in the form of an A.C. supplied mercury vapour discharge lamp and an ultraviolet responsive gas-filled photo-cell having cadmium electrodes. Normally, ultraviolet light from the transmitter is not incident on the photo-cell but, in the presence of fog, ultraviolet light is scattered towards the photo-cell which is caused to conduct and cause triggering of an indicating device. In one arrangement, Fig.1, the photo-cell 3 is shielded from the lamp 2 by a wall 10, attached to rain cover 1, which cuts out rays diverging less than 10‹ from the optical axis. On receipt of scattered light above a certain level, a relay 8 is actuated to light a fog indicator lamp 15. A measure of the visibility may be given by meter 14 measuring the position of a variable diaphragm 13, which may alternatively be adjacent the photocell 3 and which forms part of a retro-active measurement system with servomotor SM. The meter 14 may have a scale divided into just two or three visibility sizes. A plurality of photo-cells of different alarm thresholds may be provided. In a second arrangement, Fig.2 (not shown), the transmitting lamp and photo-cell are side-by-side in a radar-like configuration.
GB1227187D 1967-11-03 1968-10-01 Expired GB1227187A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1648208 1967-11-03
FR6912963A FR2041911A5 (en) 1967-11-03 1969-04-24

Publications (1)

Publication Number Publication Date
GB1227187A true GB1227187A (en) 1971-04-07

Family

ID=25754130

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1227187D Expired GB1227187A (en) 1967-11-03 1968-10-01

Country Status (3)

Country Link
FR (1) FR2041911A5 (en)
GB (1) GB1227187A (en)
NL (1) NL6815382A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1585977B1 (en) * 2003-01-25 2009-12-30 Valeo Schalter und Sensoren GmbH Sensor for detecting fog-like media

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1585977B1 (en) * 2003-01-25 2009-12-30 Valeo Schalter und Sensoren GmbH Sensor for detecting fog-like media

Also Published As

Publication number Publication date
FR2041911A5 (en) 1971-02-05
NL6815382A (en) 1969-05-06

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Legal Events

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