FR551373A - Device for the exact determination of the exposure time - Google Patents

Device for the exact determination of the exposure time

Info

Publication number
FR551373A
FR551373A FR551373DA FR551373A FR 551373 A FR551373 A FR 551373A FR 551373D A FR551373D A FR 551373DA FR 551373 A FR551373 A FR 551373A
Authority
FR
France
Prior art keywords
exposure time
exact determination
exact
determination
exposure
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)
Inventor
Marcel Panhard
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
Application granted granted Critical
Publication of FR551373A publication Critical patent/FR551373A/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)
FR551373D 1922-05-13 1922-05-13 Device for the exact determination of the exposure time Expired FR551373A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR551373T 1922-05-13

Publications (1)

Publication Number Publication Date
FR551373A true FR551373A (en) 1923-04-04

Family

ID=8936811

Family Applications (1)

Application Number Title Priority Date Filing Date
FR551373D Expired FR551373A (en) 1922-05-13 1922-05-13 Device for the exact determination of the exposure time

Country Status (1)

Country Link
FR (1) FR551373A (en)

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