GB459278A - Improvements in or relating to means for measuring reflection coefficients - Google Patents

Improvements in or relating to means for measuring reflection coefficients

Info

Publication number
GB459278A
GB459278A GB22331/36A GB2233136A GB459278A GB 459278 A GB459278 A GB 459278A GB 22331/36 A GB22331/36 A GB 22331/36A GB 2233136 A GB2233136 A GB 2233136A GB 459278 A GB459278 A GB 459278A
Authority
GB
United Kingdom
Prior art keywords
source
cell
light
lens system
diaphragm
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
GB22331/36A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Publication of GB459278A publication Critical patent/GB459278A/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
    • G01N21/55—Specular reflectivity

Abstract

459,278. Photometric apparatus. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London.-(Assignees of Lange, B. ; 45, Garystrasse, Berlin) Aug. 13, 1936, No. 22331. Convention date, Nov. 25, 1935. [Class 97 (i)] Relates to apparatus for measuring specular reflection coefficients of the type in which a light source 1 and a photo-electric cell 5 are contained in the same housing and form parts of a single unit, light from the source 1 being reflected at the surface 3 whose reflection is to be measured and thereby directed towards the cell. According to the invention, an image of the source 1 is produced on an aperture in a diaphragm 4 shielding the cell from diffused light. As shown in Fig. 1, a single lens system 2 is provided for this purpose, whilst, according to a modification, Fig. 3, two lens systems 2, 2<1> are employed, the source 1 lying at the focus of the lens system 2 and the aperture in the diaphragm 4 at the focus of the lens system 2<1>. Fig. 3 also shows a second rectifier cell 5<1> for measuring light diffused from the surface and screws 6, 6<1> for centring the lamp 1 in its housing. The test object 3 may be replaced by a standard object of known specular reflection coefficient, means being provided for adjusting the indicator of the indicating instrument to a fixed point on its scale when the standard object is in place. U.S.A. Specification 1,939,088 is referred to.
GB22331/36A 1935-11-25 1936-08-13 Improvements in or relating to means for measuring reflection coefficients Expired GB459278A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE459278X 1935-11-25

Publications (1)

Publication Number Publication Date
GB459278A true GB459278A (en) 1937-01-05

Family

ID=6539563

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22331/36A Expired GB459278A (en) 1935-11-25 1936-08-13 Improvements in or relating to means for measuring reflection coefficients

Country Status (1)

Country Link
GB (1) GB459278A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2604809A (en) * 1948-06-01 1952-07-29 Mitchell Reginald Fawn Optical means for evaluating surface finish by measurement of differential light scattering in a schlieren type optical system
US2963938A (en) * 1956-03-26 1960-12-13 Ford Motor Co Surface meters for detecting irregularities on transparent elements
US3621268A (en) * 1967-12-19 1971-11-16 Int Standard Electric Corp Reflection type contactless touch switch having housing with light entrance and exit apertures opposite and facing
CN109283159A (en) * 2018-11-19 2019-01-29 安徽科技学院 A kind of animal skin luminance index test device and its application method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2604809A (en) * 1948-06-01 1952-07-29 Mitchell Reginald Fawn Optical means for evaluating surface finish by measurement of differential light scattering in a schlieren type optical system
US2963938A (en) * 1956-03-26 1960-12-13 Ford Motor Co Surface meters for detecting irregularities on transparent elements
US3621268A (en) * 1967-12-19 1971-11-16 Int Standard Electric Corp Reflection type contactless touch switch having housing with light entrance and exit apertures opposite and facing
CN109283159A (en) * 2018-11-19 2019-01-29 安徽科技学院 A kind of animal skin luminance index test device and its application method

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