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GB800303A - Improvements in or relating to optical apparatus - Google Patents

Improvements in or relating to optical apparatus

Info

Publication number
GB800303A
GB800303A GB453555A GB453555A GB800303A GB 800303 A GB800303 A GB 800303A GB 453555 A GB453555 A GB 453555A GB 453555 A GB453555 A GB 453555A GB 800303 A GB800303 A GB 800303A
Authority
GB
United Kingdom
Prior art keywords
photo
light
lamp
meter
cell
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
GB453555A
Inventor
Lionel Richard Baker
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.)
NAT RES DEV
National Research Development Corp UK
Original Assignee
NAT RES DEV
National Research Development Corp UK
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 NAT RES DEV, National Research Development Corp UK filed Critical NAT RES DEV
Priority to GB453555A priority Critical patent/GB800303A/en
Publication of GB800303A publication Critical patent/GB800303A/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
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/12—Generating the spectrum; Monochromators
    • G01J3/18—Generating the spectrum; Monochromators using diffraction elements, e.g. grating

Landscapes

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

Abstract

800,303. Photo-electric light meter. NATIONAL RESEARCH DEVELOPMENT CORPORATION. May 10, 1956 [Feb. 15, 1955], No. 4535/55. Class 40 (3). [Also in Group XX] The light flux from an extended object 54 is measured by comparing it with the flux from a lamp 55, located behind an opaque reflector 56, using a photo-electric light meter comprising a lens 52 which focuses the object 54 on a photo-cell 53, a scalloped diffraction grating 11 which forms a uniform patch of light on the photo-cell and a rotary shutter which alternately cuts off the light from the lamp and the object. The resulting photocell output is amplified and fed to an indicator (e.g. headphones or a meter) and the lamp brightness is adjusted for balance.
GB453555A 1955-02-15 1955-02-15 Improvements in or relating to optical apparatus Expired GB800303A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB453555A GB800303A (en) 1955-02-15 1955-02-15 Improvements in or relating to optical apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB453555A GB800303A (en) 1955-02-15 1955-02-15 Improvements in or relating to optical apparatus

Publications (1)

Publication Number Publication Date
GB800303A true GB800303A (en) 1958-08-27

Family

ID=9779014

Family Applications (1)

Application Number Title Priority Date Filing Date
GB453555A Expired GB800303A (en) 1955-02-15 1955-02-15 Improvements in or relating to optical apparatus

Country Status (1)

Country Link
GB (1) GB800303A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267284A (en) * 1963-12-26 1966-08-16 Mackta Leo Optic wave modulation method and apparatus using a rotating diffraction grating
US3453035A (en) * 1963-11-04 1969-07-01 Diffraction Ltd Inc Optical system with diffraction grating screen
US3497695A (en) * 1961-12-11 1970-02-24 Raytheon Co Radiant energy transmitting device
DE4335244A1 (en) * 1993-10-15 1995-06-22 Daimler Benz Ag Device for improving driver visibility in automobiles

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3497695A (en) * 1961-12-11 1970-02-24 Raytheon Co Radiant energy transmitting device
US3453035A (en) * 1963-11-04 1969-07-01 Diffraction Ltd Inc Optical system with diffraction grating screen
US3267284A (en) * 1963-12-26 1966-08-16 Mackta Leo Optic wave modulation method and apparatus using a rotating diffraction grating
DE4335244A1 (en) * 1993-10-15 1995-06-22 Daimler Benz Ag Device for improving driver visibility in automobiles
DE4335244B4 (en) * 1993-10-15 2006-10-19 Daimlerchrysler Ag Arrangement for image recording

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