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FR659859A - Handheld Luxmeter - Google Patents

Handheld Luxmeter

Info

Publication number
FR659859A
FR659859A FR659859DA FR659859A FR 659859 A FR659859 A FR 659859A FR 659859D A FR659859D A FR 659859DA FR 659859 A FR659859 A FR 659859A
Authority
FR
France
Prior art keywords
luxmeter
handheld
handheld luxmeter
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR659859A publication Critical patent/FR659859A/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
    • G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
    • G01J1/22—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using a variable element in the light-path, e.g. filter, polarising means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
FR659859D 1927-12-10 1927-12-10 Handheld Luxmeter Expired FR659859A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR659859T 1927-12-10

Publications (1)

Publication Number Publication Date
FR659859A true FR659859A (en) 1929-07-04

Family

ID=9009908

Family Applications (1)

Application Number Title Priority Date Filing Date
FR659859D Expired FR659859A (en) 1927-12-10 1927-12-10 Handheld Luxmeter

Country Status (1)

Country Link
FR (1) FR659859A (en)

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