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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Sc Practical Physics, pg Light from each of the two sources enters through its respective entrance and illuminates one side of the white disk. Right click equation to reveal menu options. Equipment of Class Rooms. Light rays from the two sources enter on either side of the box. You may subscribe either as an OSA member, or as an authorized user of your institution. Click here to see what’s new.

Please login to set citation alerts. Function This instrument was used in comparing the brightness of an unknown source of light with that of a standard one.

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

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OSA | A New Principle and its Application to the Lummer-Brodhun Photometer

When this is accomplished, the luminosity of the unknown source can be calculated. For a fuller description, see the following website.

Where the prisms do not touch, total internal reflection occurs. OSA will be closed for the holidays from 21 December On either side of the screen are two large circular apertures in the sides of the box.

If you require urgent assistance, please contact Customer Service. Click here to learn more. The light that is reflected off each side of the lumner is directed through a right angled prism and towards a Lummer-Brodhun cube. photmoeter

112 – Lummer- Brodhun Photometer

April 1, Published: Abstract No abstract available. Journal of the Optical Society of America Vol. The housing is attached to a yoke on which it pivots. What the observer sees in the eyepiece is two superimposed circles on top of each other, one smaller than the other. The observer can then see a circular disc of light from one source, surrounded by an halo from the other.

Lummer Brodhun Photometer – (SIPO) – Shambhavi Impex, Navi Mumbai | ID:

The photometer consists of an opaque screen which can be removed from a box. In the box above the screen are two mirrors and a pair of prisms, which direct the light from the two light sources outside the box into the eyepiece at the top of the box.

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Cited By You do not have subscription access to this journal. A Lummer-Brodhun cube is made up of two right-angled prisms that are placed with their hypotenuse sides together to form a cube. Not Accessible Your account may give you access.

When the brightness are identical, the two circles become one. Where they do, all the light is transmitted to the other side.

Journal of the Optical Society of America. 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. The housing has no mechanism for adjusting the mirrors and is plain on the outside. Equations displayed with MathJax. Password Forgot your password? Figure files are available to subscribers only.