GB1305911A - - Google Patents

Info

Publication number
GB1305911A
GB1305911A GB5099569A GB1305911DA GB1305911A GB 1305911 A GB1305911 A GB 1305911A GB 5099569 A GB5099569 A GB 5099569A GB 1305911D A GB1305911D A GB 1305911DA GB 1305911 A GB1305911 A GB 1305911A
Authority
GB
United Kingdom
Prior art keywords
rack
members
attenuation
pinion
balance conditions
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
GB5099569A
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 filed Critical
Publication of GB1305911A publication Critical patent/GB1305911A/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
    • G01J1/10—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
    • G01J1/22—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 a variable element in the light-path, e.g. filter, polarising means
    • G01J1/24—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 a variable element in the light-path, e.g. filter, polarising means using electric radiation detectors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

1305911 Radiation attenuation combs BECKMAN INSTRUMENTS Ltd 18 Sept 1970 [17 Oct 1969] 50995/69 Heading G2J An attenuation for use in spectrophometer comprises two apertured members 10, 11 which are mutually aligned and jointly movable by a rack and pinion and which are separately movable to vary the attenuation to provide for scale expansion when a comparator 36 indicates balance conditions between beams of light passing through the members 10, 11 and a sample cell 31. The rack and pinion normally moves both members 10, 11 and a solenoid is operated at balance conditions, to disengage one member from the other so that the rack and pinion drives only one member.
GB5099569A 1969-10-17 1969-10-17 Expired GB1305911A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5099569 1969-10-17

Publications (1)

Publication Number Publication Date
GB1305911A true GB1305911A (en) 1973-02-07

Family

ID=10458232

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5099569A Expired GB1305911A (en) 1969-10-17 1969-10-17

Country Status (3)

Country Link
US (1) US3685885A (en)
DE (1) DE2050963A1 (en)
GB (1) GB1305911A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1414311A (en) * 1972-07-12 1975-11-19 Pye Ltd Sepctrophotometers
US3999863A (en) * 1975-08-13 1976-12-28 Rohr Industries, Inc. Apparatus for measuring light absorption
JPS58120202A (en) * 1982-01-09 1983-07-18 Takashi Mori Optical switch device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1849607A (en) * 1929-04-11 1932-03-15 Bernheim Georges Apparatus for the comparison and measurement of luminosity
US2896508A (en) * 1953-05-21 1959-07-28 Agfa Ag Diaphragm suitable for photometers

Also Published As

Publication number Publication date
DE2050963A1 (en) 1971-07-01
US3685885A (en) 1972-08-22

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees