Diagram of a Lummer-Brodhun tively, falls on a diffuse white photometer head. surface W. Some of the light which is scattered bythis surface is reflected from the . The Lummer Brodhun Photometer finds wide application in comparison of illuminating power of different light sources. Our L.B. Photometer design and selection. 2 PRINCIPLES OF PHOTOMETRY. 3 LUMMER – BRODHUN PHOTOMETER. 4 PROBLEMS. PH UNIT- 3 LECT – 1. UNIT III LECT – 1. 2. PHOTOMETRY.

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When the brightness are identical, the two circles become one. The housing is photometr to a yoke on which it pivots. Journal of the Optical Society of America Vol. On either side of the screen are two large circular apertures in the sides of the box.

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Lummer- Brodhun Photometer – Physics Museum – The University of Queensland, Australia

OSA will be closed for the holidays from 21 December Equipment of Class Rooms. If you require urgent assistance, please contact Customer Service. This Photometer consists of a metal box with two entrances and an eyepiece as well as a slot which allows a white magnesium carbonate disk to be mounted between the two entrances.


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This item is a Lummer-Brodhun Photometer. You do not have subscription access to this journal. April 1, Published: The photometer consists of an opaque phottometer which can be removed from a box. For a fuller description, see the following website. Where they do, all the light is transmitted to the other side.

By matching the brightnesses of the two, photo,eter observer can use the known luminosity of one source and the distances to both brohun to calculate the luminosity of the unknown source.

They first strike a white slab. Journal of the Optical Society of America. You may subscribe either as an OSA member, or as an authorized user of your institution. Some of the scattered light on each side is reflected by mirrors towards what is called a Lummer-Brodhun cube, which consists of two right-angled prisms.

Light rays from the two sources enter on either side of the box. Please login to set citation alerts.

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Lummer Brodhun Photometer | NISCO

Equations displayed with MathJax. This cube directs the light rays coming from both sides of the disk into the eyepiece so that the user can observe the light from both sources simultaneously.

Light from each of the two sources enters through its respective entrance and illuminates one side of the white disk. Login or Create Account.

Abstract Pnotometer abstract available. References You do not have subscription access to this journal.

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Lummer Brodhun Photometer

The housing has no mechanism for adjusting the mirrors and is plain on the outside. Function This instrument was used in comparing the brightness of an unknown source of light with that of a standard one. Sc Practical Physics, pg Similar to the Weber Photometer this item was designed to compare the brightness of an unknown light source to the brightness of a standard light source.

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