GB736676A - Improved photometer for measuring reflected light - Google Patents

Improved photometer for measuring reflected light

Info

Publication number
GB736676A
GB736676A GB586351A GB586351A GB736676A GB 736676 A GB736676 A GB 736676A GB 586351 A GB586351 A GB 586351A GB 586351 A GB586351 A GB 586351A GB 736676 A GB736676 A GB 736676A
Authority
GB
United Kingdom
Prior art keywords
lamp
mirror
objective
casing
image
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
GB586351A
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.)
FREDERICK WILLIAM ENDICOTT
Original Assignee
FREDERICK WILLIAM ENDICOTT
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 FREDERICK WILLIAM ENDICOTT filed Critical FREDERICK WILLIAM ENDICOTT
Priority to GB586351A priority Critical patent/GB736676A/en
Publication of GB736676A publication Critical patent/GB736676A/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
    • G01J1/0414—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using plane or convex mirrors, parallel phase plates, or plane beam-splitters
    • 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
    • G01J1/28—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 variation of intensity or distance of source
    • 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
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/4209—Photoelectric exposure meters for determining the exposure time in recording or reproducing
    • 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
    • G01J1/0214—Constructional arrangements for removing stray light
    • 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

Abstract

736,676. Photometers; photographic-exposure meters. ENDICOTT, F. W. June 10, 1952 [March 12, 1951], No. 5863/51. Classes 97 (1) and 98 (1). A photometer, which may be adapted for measuring photographic exposures, comprises a casing containing a telescope having on its optical axis in proximity to the focus of the objective a small mirror peripherally surrounded by space and illuminated by a lamp in a side conduit of the casing so as to be superimposed on the image of the object formed by the objective, a regulator being provided to vary the current through the lamp until the mirror appears to be as bright as the parts of the image surrounding it, and an electric indicator such as a voltmeter to measure the voltage across the lamp. As shown the mirror 34 is formed on the end of a metal rod 33 arranged along the axis of the objective 25 and supported by a transparent disc so that the periphery of the mirror is entirely surrounded by space and is at or near the focus of the objective. Light from the lamp 30 falls on the mirror 34 which is viewed, together with the image of the object formed by the lens 25, in an eyepiece 24. The whole may be mounted in a casing containing batteries, a variable resistance in circuit with the lamp and a voltmeter. The casing may carry the usual exposure calculator. Filters may be used in the apparatus.
GB586351A 1951-03-12 1951-03-12 Improved photometer for measuring reflected light Expired GB736676A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB586351A GB736676A (en) 1951-03-12 1951-03-12 Improved photometer for measuring reflected light

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB586351A GB736676A (en) 1951-03-12 1951-03-12 Improved photometer for measuring reflected light

Publications (1)

Publication Number Publication Date
GB736676A true GB736676A (en) 1955-09-14

Family

ID=9804024

Family Applications (1)

Application Number Title Priority Date Filing Date
GB586351A Expired GB736676A (en) 1951-03-12 1951-03-12 Improved photometer for measuring reflected light

Country Status (1)

Country Link
GB (1) GB736676A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3644048A (en) * 1969-06-27 1972-02-22 Agfa Gevaert Ag Brightness indicating comparison device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3644048A (en) * 1969-06-27 1972-02-22 Agfa Gevaert Ag Brightness indicating comparison device

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