GB445009A - Improvements in apparatus for measuring by means of photoelectric cells the reflecting power of surfaces of substances - Google Patents

Improvements in apparatus for measuring by means of photoelectric cells the reflecting power of surfaces of substances

Info

Publication number
GB445009A
GB445009A GB24437/35A GB2443735A GB445009A GB 445009 A GB445009 A GB 445009A GB 24437/35 A GB24437/35 A GB 24437/35A GB 2443735 A GB2443735 A GB 2443735A GB 445009 A GB445009 A GB 445009A
Authority
GB
United Kingdom
Prior art keywords
light
diaphragm
cell
aperture
potential
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
GB24437/35A
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.)
Carl Zeiss AG
Original Assignee
Carl Zeiss AG
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 Carl Zeiss AG filed Critical Carl Zeiss AG
Publication of GB445009A publication Critical patent/GB445009A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N21/474—Details of optical heads therefor, e.g. using optical fibres

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

445,009. Photometric apparatus. ZEISS, C., [Firm of], Carl-Zeiss-Strasse, Jena, Germany.-(Assignees of Papirindustriens Forskningsinstitutt. Sk÷yen, near Oslo, Norway) Sept. 2, 1935, No. 24437. Convention date, Sept. 5, 1934. [Class 97 (i)] Apparatus for comparing the reflecting powers of surfaces comprises two photo-elec tric cells A, B connected together in parallel and each connected in series to a resistance 10, 18 and a common source of potential E, cell A being exposed alternately to light reflected by a standard surface and to light from the surface to be examined, and cell B being exposed to light from the common source 7, means 17 being provided to adjust the second beam until the potentials across the resistances are equal as measured by an electrometric instrument 20. The comparison beam obtained from a box 21 illuminated by lamp 7 passes through a tube 14 into an integrating sphere 13, and may be limited by an adjustable diaphragm 17. The measuring beam passes through aperture 5 in sphere 3 and is reflected into cell A by the surface 6 covering aperture 4. For white light diaphragm 17 is first opened fully and with a standard surface, such as one coated with barium sulphate, over aperture 4, diaphragm 16 is adjusted to give equal potential falls along resistances 10 and 18. The surface to be measured is now placed at 6 and diaphragm 17 adjusted, to give equaliy of potential, its reading giving the relative reflecting power of the surface. For coloured light, colour filters 25 on disc 26 may be rotated before cell A and a similar disc 29 rotated in the comparison beam each filter 25 being associated with a particular aperture 28 on disc 27 rotatable in the comparison beam. To ensure equal sensitivity of the cells for the various wavelengths the shaft driving the discs may also operate a potential changing arm 32 making contact with studs 33, or the light openings of filters 25 may be varied.
GB24437/35A 1934-09-05 1935-09-02 Improvements in apparatus for measuring by means of photoelectric cells the reflecting power of surfaces of substances Expired GB445009A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO445009X 1934-09-05

Publications (1)

Publication Number Publication Date
GB445009A true GB445009A (en) 1936-04-01

Family

ID=19905677

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24437/35A Expired GB445009A (en) 1934-09-05 1935-09-02 Improvements in apparatus for measuring by means of photoelectric cells the reflecting power of surfaces of substances

Country Status (1)

Country Link
GB (1) GB445009A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451501A (en) * 1944-09-21 1948-10-19 Liben William Specular reflectometer
US3432243A (en) * 1963-10-10 1969-03-11 George K C Hardesty Ratio spectroradiometer
US4373818A (en) * 1978-01-25 1983-02-15 Kabushiki Kaisha Kyoto Daiichi Kagaku Method and device for analysis with color identification test paper

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451501A (en) * 1944-09-21 1948-10-19 Liben William Specular reflectometer
US3432243A (en) * 1963-10-10 1969-03-11 George K C Hardesty Ratio spectroradiometer
US4373818A (en) * 1978-01-25 1983-02-15 Kabushiki Kaisha Kyoto Daiichi Kagaku Method and device for analysis with color identification test paper

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