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FR614172A - Illuminance measuring device - Google Patents

Illuminance measuring device

Info

Publication number
FR614172A
FR614172A FR614172DA FR614172A FR 614172 A FR614172 A FR 614172A FR 614172D A FR614172D A FR 614172DA FR 614172 A FR614172 A FR 614172A
Authority
FR
France
Prior art keywords
measuring device
illuminance measuring
illuminance
measuring
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
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of FR614172A publication Critical patent/FR614172A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/12—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using wholly visual means
    • G01J1/14—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using wholly visual means using comparison with a surface of graded brightness

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
FR614172D 1926-02-25 1926-04-07 Illuminance measuring device Expired FR614172A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL614172X 1926-02-25

Publications (1)

Publication Number Publication Date
FR614172A true FR614172A (en) 1926-12-08

Family

ID=19788195

Family Applications (1)

Application Number Title Priority Date Filing Date
FR614172D Expired FR614172A (en) 1926-02-25 1926-04-07 Illuminance measuring device

Country Status (1)

Country Link
FR (1) FR614172A (en)

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