GB1236977A - Photo-electric measuring method - Google Patents
Photo-electric measuring methodInfo
- Publication number
- GB1236977A GB1236977A GB34251/68A GB3425168A GB1236977A GB 1236977 A GB1236977 A GB 1236977A GB 34251/68 A GB34251/68 A GB 34251/68A GB 3425168 A GB3425168 A GB 3425168A GB 1236977 A GB1236977 A GB 1236977A
- Authority
- GB
- United Kingdom
- Prior art keywords
- medium
- discontinuities
- echo signal
- amplifier
- photo
- 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
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
-
- 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
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
- G01S17/10—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves
-
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
-
- 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)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Remote Sensing (AREA)
- Radar, Positioning & Navigation (AREA)
- Computer Networks & Wireless Communication (AREA)
- Analytical Chemistry (AREA)
- Immunology (AREA)
- Pathology (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
1,236,977. Measuring visibility photo-electrically. ELTRO G.m.b.H. & CO., GESELLSCHAFT FUR STRAHLUNGSTECHNIK. July 18, 1968 [July 18, 1967], No.34251/68. Heading G1A. [Also in Divisions H3-H5 A photo-electric measuring apparatus for determining the optical transmittivity of an extended optical medium e.g. cloud 6, Fig.1 comprises a pulsed laser 1 transmitting coherent light pulses to the medium, a receiver 2, receiving, coaxially with the transmitted pulses, the reflections from the extended medium and comprising a photo-multiplier 12, and a circuit, Fig.5, for processing the echo signal PE Fig.4, from one pulse, signal PE showing discontinuities at times t 1 and t 2 indicating reflections at the boundaries of area of the medium having different optical characteristics. The received echo signal amplitude PE is given by:- where:- P s = transmitted pulse amplitude #v= volume element of medium reflecting echo signal (dependent on transmitted pulse width and beam width) X =ct = distance to volume element #v. # (x) = remitting co-efficient of medium # (x) = extinction co-efficient For an area having constant values of #(x) and #(x) PE.t<SP>2</SP> is exponential e.g. Fig.3 and:- In the processing circuit, a differentiator/computer amplifier 21 determines dPE/dt and detects any discontinuities in the echo signal from amplifier 20. A logarithmic amplifier 22 determines Log |PE/P s t<SP>2</SP>| if means 21 detects no discontinuities. A differentiator 25 then produces the value of #(x). A computer 26 determines the visibility of the medium from the equation: and passes it to the recorder or display 28. If means 21 detects discontinuities a counter 23 is activated to determine times t 1 , t 2 &c. A logarithmic amplifier 24, similar to 22 processes the echo signal PE but is gated off during the discontinuities by the counter output. Successive values of [C-D#(x).t] are thus produced by amplifier 24 and the value of (X) for each area is detected by differentiator 27 and displayed or recorded at 28. Where the discontinuities are due to a cloud, a cloud thickness indicator 29 is provided fed by counter 23.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19671623422 DE1623422B2 (en) | 1967-07-18 | 1967-07-18 | LIGHT-ELECTRIC MEASUREMENT METHOD |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1236977A true GB1236977A (en) | 1971-06-23 |
Family
ID=5682747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34251/68A Expired GB1236977A (en) | 1967-07-18 | 1968-07-18 | Photo-electric measuring method |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE1623422B2 (en) |
| FR (1) | FR1589684A (en) |
| GB (1) | GB1236977A (en) |
| NL (1) | NL6810143A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2650379C1 (en) * | 1976-11-03 | 1997-01-30 | Stn Atlas Elektronik Gmbh | Electromagnetic floating or submerged metal body detection and location device |
| DE3002791C2 (en) * | 1980-01-26 | 1983-04-28 | Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt e.V., 5000 Köln | Procedure for measuring visibility, oblique visibility and cloud height |
| DE3222719A1 (en) * | 1982-06-18 | 1984-02-02 | Telefunken electronic GmbH, 7100 Heilbronn | Circuit for an optoelectronic switching element |
| FR2538125A1 (en) * | 1982-12-20 | 1984-06-22 | Enertec | Cloud rangefinder |
| FR2865545B1 (en) * | 2004-01-22 | 2006-05-05 | Commissariat Energie Atomique | LIDAR COMPACT |
-
1967
- 1967-07-18 DE DE19671623422 patent/DE1623422B2/en active Pending
-
1968
- 1968-07-17 FR FR1589684D patent/FR1589684A/fr not_active Expired
- 1968-07-18 NL NL6810143A patent/NL6810143A/xx unknown
- 1968-07-18 GB GB34251/68A patent/GB1236977A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1589684A (en) | 1970-04-06 |
| DE1623422A1 (en) | 1971-02-18 |
| DE1623422B2 (en) | 1972-11-09 |
| NL6810143A (en) | 1969-01-21 |
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