GB381696A - Improvements in or relating to optical densitometers - Google Patents

Improvements in or relating to optical densitometers

Info

Publication number
GB381696A
GB381696A GB2616831A GB2616831A GB381696A GB 381696 A GB381696 A GB 381696A GB 2616831 A GB2616831 A GB 2616831A GB 2616831 A GB2616831 A GB 2616831A GB 381696 A GB381696 A GB 381696A
Authority
GB
United Kingdom
Prior art keywords
liquid
light
cell
mask
holder
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
GB2616831A
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.)
ERNEST BERNARD RIVINGTON BENSO
Baird Television Ltd
Original Assignee
ERNEST BERNARD RIVINGTON BENSO
Baird Television Ltd
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 ERNEST BERNARD RIVINGTON BENSO, Baird Television Ltd filed Critical ERNEST BERNARD RIVINGTON BENSO
Priority to GB2616831A priority Critical patent/GB381696A/en
Publication of GB381696A publication Critical patent/GB381696A/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
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/251—Colorimeters; Construction thereof

Abstract

381,696. Photometric apparatus. RICHARDS, C. L., BENSON, E. B. R., and BAIRD TELEVISION, Ltd., 133, Long Acre, London. Sept. 18, 1931, No. 26168 and 27607. [Class 97 (i).] The optical density of a liquid is measured or compared with that of a standard liquid by transmitting light through a variable aperture and through the liquid on to a light-sensitive cell, the deflection of an electrical indicating instrument connected to the cell being brought to a predetermined value when a solution of known optical density is in the path of the light beam by adjusting the size of the variable aperture or by adjusting the temperature of the lamp filament constituting the light source. Two cells 8, containing a standard liquid and the liquid to be tested are mounted side by side on a holder 16 which can slide in grooves in a block 18 so that light from the source 2 may be made to traverse either cell. The light is rendered parallel by a lens 4 and passes through a variable aperture in a mask 6 before passing through the liquid. The light after passing through the liquid passes through a mask 10 and is then focused by a lens 12 on to the sensitive surface of a photo-electric cell 14. The aperture in the mask 6 can be varied by means of a sliding plate 34 moved by a screw 38. A variable resistance 28 and a voltmeter 26 are included in the circuit of the lamp 2. The holder 16 may be moved by a lever in which the movement of the operator's hand is considerably greater than the movement imparted to the holder.
GB2616831A 1931-09-18 1931-09-18 Improvements in or relating to optical densitometers Expired GB381696A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2616831A GB381696A (en) 1931-09-18 1931-09-18 Improvements in or relating to optical densitometers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2616831A GB381696A (en) 1931-09-18 1931-09-18 Improvements in or relating to optical densitometers

Publications (1)

Publication Number Publication Date
GB381696A true GB381696A (en) 1932-10-13

Family

ID=10239403

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2616831A Expired GB381696A (en) 1931-09-18 1931-09-18 Improvements in or relating to optical densitometers

Country Status (1)

Country Link
GB (1) GB381696A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2898802A (en) * 1956-01-24 1959-08-11 Ljungberg Lars Rune Photoelectric colorimeter
US3014401A (en) * 1958-05-30 1961-12-26 Zeiss Carl Spectrophotometer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2898802A (en) * 1956-01-24 1959-08-11 Ljungberg Lars Rune Photoelectric colorimeter
US3014401A (en) * 1958-05-30 1961-12-26 Zeiss Carl Spectrophotometer

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