FR2226070A5 - Optical transmissivity meter which allows for ambient light - has two detectors one at end of long path and other adjacent to light source - Google Patents

Optical transmissivity meter which allows for ambient light - has two detectors one at end of long path and other adjacent to light source

Info

Publication number
FR2226070A5
FR2226070A5 FR7313574A FR7313574A FR2226070A5 FR 2226070 A5 FR2226070 A5 FR 2226070A5 FR 7313574 A FR7313574 A FR 7313574A FR 7313574 A FR7313574 A FR 7313574A FR 2226070 A5 FR2226070 A5 FR 2226070A5
Authority
FR
France
Prior art keywords
light
mirror
light source
ambient light
measure
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
FR7313574A
Other languages
French (fr)
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.)
Safran Aerosystems SAS
Original Assignee
Aerazur Constructions Aeronautiques SA
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 Aerazur Constructions Aeronautiques SA filed Critical Aerazur Constructions Aeronautiques SA
Priority to FR7313574A priority Critical patent/FR2226070A5/en
Priority to CA196,274A priority patent/CA1000964A/en
Priority to US05/459,435 priority patent/US3931526A/en
Priority to BR2915/74A priority patent/BR7402915D0/en
Application granted granted Critical
Publication of FR2226070A5 publication Critical patent/FR2226070A5/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

A measure of the optical transmissivity of the atmosphere is found be sending a beam of light from a chopped source 1 via a mirror 3 over an accurately known long atmospheric path; another mirror 4 reflects the light to a detector 2 whose output is A. Simultaneously the same light source is directed via mirror 6 onto an identical detector 5 placed in a clear region of the mirror 3, its output is B, and contains a measure of the ambient light when the light source is off, and with the bulb on the output B contains a measure of the source brightness. Electronic processing results in a signal consisting solely of the ambient light, and a digital signal of the transmissivity. A digital-to-analogue converter can change the digital signal into continuous form if needed.
FR7313574A 1973-04-13 1973-04-13 Optical transmissivity meter which allows for ambient light - has two detectors one at end of long path and other adjacent to light source Expired FR2226070A5 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR7313574A FR2226070A5 (en) 1973-04-13 1973-04-13 Optical transmissivity meter which allows for ambient light - has two detectors one at end of long path and other adjacent to light source
CA196,274A CA1000964A (en) 1973-04-13 1974-03-28 Measurement of atmospheric transmission factors and intensity of ambient light
US05/459,435 US3931526A (en) 1973-04-13 1974-04-09 Process and a device for measuring transmission factors
BR2915/74A BR7402915D0 (en) 1973-04-13 1974-04-10 PROCESS FOR MEASURING TRANSMISSION AND TRANSMISSION METERS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7313574A FR2226070A5 (en) 1973-04-13 1973-04-13 Optical transmissivity meter which allows for ambient light - has two detectors one at end of long path and other adjacent to light source

Publications (1)

Publication Number Publication Date
FR2226070A5 true FR2226070A5 (en) 1974-11-08

Family

ID=9117967

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7313574A Expired FR2226070A5 (en) 1973-04-13 1973-04-13 Optical transmissivity meter which allows for ambient light - has two detectors one at end of long path and other adjacent to light source

Country Status (1)

Country Link
FR (1) FR2226070A5 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2393295A1 (en) * 1977-05-31 1978-12-29 Snecma ATMOSPHERE TRANSMISSIVE POWER MEASUREMENT
CN105973848A (en) * 2016-06-30 2016-09-28 华东师范大学 Method for measuring ultraviolet low transmittance

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2393295A1 (en) * 1977-05-31 1978-12-29 Snecma ATMOSPHERE TRANSMISSIVE POWER MEASUREMENT
CN105973848A (en) * 2016-06-30 2016-09-28 华东师范大学 Method for measuring ultraviolet low transmittance

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Legal Events

Date Code Title Description
ST Notification of lapse
DJ Final judicial decision determining the rights related to a patent