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GB956472A - Improvements in or relating to brightness meters - Google Patents

Improvements in or relating to brightness meters

Info

Publication number
GB956472A
GB956472A GB4100160A GB4100160A GB956472A GB 956472 A GB956472 A GB 956472A GB 4100160 A GB4100160 A GB 4100160A GB 4100160 A GB4100160 A GB 4100160A GB 956472 A GB956472 A GB 956472A
Authority
GB
United Kingdom
Prior art keywords
optical system
screen
diaphragm
photo
lens
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
GB4100160A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB956472A publication Critical patent/GB956472A/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
    • G01J1/02—Details
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • 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
    • G01J1/02—Details
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
    • G01J1/0437—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using masks, aperture plates, spatial light modulators, spatial filters, e.g. reflective filters
    • 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
    • G01J1/02—Details
    • G01J1/0271—Housings; Attachments or accessories for photometers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Telescopes (AREA)

Abstract

956, 472. Photo-electric brightness meters. PHILIPS ELECTRICAL INDUSTRIES Ltd. Nov. 29, 1960 [Dec. 2, 1959], No. 41001/60. Heading G1A. A brightness meter for determining the degree of illumination of part of a substantially horizontal surface, for example, a road, from a location at a vertical distance from the surface which is small with respect to the horizontal distance from the part of the surface, comprises a first optical system 1, including a lens 2, and a cylindrical reflector 6 for reproducing an image of the part of the surface on the photo-cathode of an electron multiplier connected to an amplifier 5, in association with a diaphragm 10, located at the focal plane of the system with an aperture allowing only the required part of the radiation pattern formed at the focal plane to impinge on the cell, in conjunction with a second optical system 8 having its axis parallel to that of the first system and provided with a lens 9, a screen 11 and a lensed eyepiece 12 to facilitate the alignment of the first optical system in a given direction. The diaphragm 10 and screen 11 form a unitary structure in the form of a slide 14, Fig. 2, with the lower portion having a trapezoidal opening 18 and an upper portion 15 corresponding to the screen 11 having two intersecting lines, the point of intersection coinciding with the apex 19 of the triangular image 17 when the optical system is correctly focused.
GB4100160A 1959-12-02 1960-11-29 Improvements in or relating to brightness meters Expired GB956472A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL245995 1959-12-02

Publications (1)

Publication Number Publication Date
GB956472A true GB956472A (en) 1964-04-29

Family

ID=19752063

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4100160A Expired GB956472A (en) 1959-12-02 1960-11-29 Improvements in or relating to brightness meters

Country Status (1)

Country Link
GB (1) GB956472A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2134251A (en) * 1982-12-24 1984-08-08 Rolls Royce Optical radiation pyrometer
GB2240175A (en) * 1990-01-19 1991-07-24 Asahi Optical Co Ltd Photometry device for camera

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2134251A (en) * 1982-12-24 1984-08-08 Rolls Royce Optical radiation pyrometer
GB2240175A (en) * 1990-01-19 1991-07-24 Asahi Optical Co Ltd Photometry device for camera
US5136326A (en) * 1990-01-19 1992-08-04 Asahi Kogaku Kogyo Kabushiki Kaisha Photometry device for camera
GB2240175B (en) * 1990-01-19 1994-01-26 Asahi Optical Co Ltd Camera photometry device

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