GB335179A - Improvements in means of measuring intensity of light - Google Patents

Improvements in means of measuring intensity of light

Info

Publication number
GB335179A
GB335179A GB1857529A GB1857529A GB335179A GB 335179 A GB335179 A GB 335179A GB 1857529 A GB1857529 A GB 1857529A GB 1857529 A GB1857529 A GB 1857529A GB 335179 A GB335179 A GB 335179A
Authority
GB
United Kingdom
Prior art keywords
light
cell
photo
graduated
filter
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
GB1857529A
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
Priority to GB1857529A priority Critical patent/GB335179A/en
Publication of GB335179A publication Critical patent/GB335179A/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
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors

Abstract

335,179. Gillard, F. W. June 17, 1929. Photometric apparatus. - For the determination and comparison of light intensities, more particularly low intensities, a graduated light filter, or slot, or variable diaphragm is used by which the amount of light falling on a photo-electric cell not only serves as a means of measurement by giving a direct reading in candle-power, but is also so selected in degree and range of intensity that the photo-electric cell is caused to work on that part of its characteristic curve where the greatest change of indication is obtained with the minimum change in illumination. The light 9 to be measured is passed through a graduated filter 11, mounted on graduated rollers 12, on to a photo-electric cell 10 in circuit with an indicating galvanometer 14 as shown. The position of the filter is a measure of the intensity of the light 9. In a modification the cell is connected in the grid circuit of a three electrode valve and the anode current is utilized to serve as an indication. Alternatively the cell or the valve circuit may constitute one arm of a Wheatstone bridge. For the measurement of high intensities additional filters may be fitted in the light path.
GB1857529A 1929-06-17 1929-06-17 Improvements in means of measuring intensity of light Expired GB335179A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1857529A GB335179A (en) 1929-06-17 1929-06-17 Improvements in means of measuring intensity of light

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1857529A GB335179A (en) 1929-06-17 1929-06-17 Improvements in means of measuring intensity of light

Publications (1)

Publication Number Publication Date
GB335179A true GB335179A (en) 1930-09-17

Family

ID=10114794

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1857529A Expired GB335179A (en) 1929-06-17 1929-06-17 Improvements in means of measuring intensity of light

Country Status (1)

Country Link
GB (1) GB335179A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2987957A (en) * 1956-07-05 1961-06-13 Daystrom Inc Light-sensitive exposure meters
US3272065A (en) * 1962-02-05 1966-09-13 Yamada Oil tester

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2987957A (en) * 1956-07-05 1961-06-13 Daystrom Inc Light-sensitive exposure meters
US3272065A (en) * 1962-02-05 1966-09-13 Yamada Oil tester

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