FR425854A - Photomètre à sélénium - Google Patents

Photomètre à sélénium

Info

Publication number
FR425854A
FR425854A FR425854DA FR425854A FR 425854 A FR425854 A FR 425854A FR 425854D A FR425854D A FR 425854DA FR 425854 A FR425854 A FR 425854A
Authority
FR
France
Prior art keywords
photometer
selenium
selenium photometer
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
English (en)
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.)
GESELLSCHAFT fur ELEKTROTECHNISCHE INDUSTRIE MIT
Original Assignee
GESELLSCHAFT fur ELEKTROTECHNISCHE INDUSTRIE MIT
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 GESELLSCHAFT fur ELEKTROTECHNISCHE INDUSTRIE MIT filed Critical GESELLSCHAFT fur ELEKTROTECHNISCHE INDUSTRIE MIT
Application granted granted Critical
Publication of FR425854A publication Critical patent/FR425854A/fr
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
    • G01J1/34—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 separate light paths used alternately or sequentially, e.g. flicker
    • G01J1/36—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 separate light paths used alternately or sequentially, e.g. flicker using electric radiation detectors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
FR425854D 1910-01-17 1911-01-16 Photomètre à sélénium Expired FR425854A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE425854X 1910-01-17

Publications (1)

Publication Number Publication Date
FR425854A true FR425854A (fr) 1911-06-22

Family

ID=1468476

Family Applications (1)

Application Number Title Priority Date Filing Date
FR425854D Expired FR425854A (fr) 1910-01-17 1911-01-16 Photomètre à sélénium

Country Status (1)

Country Link
FR (1) FR425854A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE747363C (de) * 1940-01-31 1944-09-20 Aeg Verfahren und Vorrichtung zur lichtelektrischen Differenzmessung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE747363C (de) * 1940-01-31 1944-09-20 Aeg Verfahren und Vorrichtung zur lichtelektrischen Differenzmessung

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