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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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You may subscribe either as an OSA member, or as an authorized user of your institution. 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.

Journal of the Optical Society of America. Remember me on this computer. Not Accessible Your account may give you access. They first strike a white slab. References You do not have subscription access to this journal.

The photometer consists of an opaque screen which can be removed from a box. We’ve also updated our Privacy Notice. Sc Practical Physics, pg On either side of the screen are two large circular apertures in the sides of the box. Journal of the Optical Society of America Vol. When this is accomplished, the luminosity of the unknown source can be calculated. A Lummer-Brodhun cube is made up of two right-angled prisms that are placed with their hypotenuse sides together to form a cube.


Cited by links are available to subscribers only. Login or Create Account. 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.

Citation lists brodhu outbound citation links are available to subscribers only. Cited By You do not have subscription access to this journal. Equations displayed lujmer MathJax. By moving the unknown light source farther or closer to the photometer, one tries to get rid of the two distinct circles.

Journal of the Optical Society of America

photomteer The housing has no mechanism for adjusting the mirrors and is plain on the outside. What the observer sees in the eyepiece is two superimposed circles on top of each other, one smaller than the other. This item is a Lummer-Brodhun Photometer. If you require urgent assistance, please contact Customer Service.

Lummer-Brodhun Cube | Article about Lummer-Brodhun Cube by The Free Dictionary

Password Forgot your password? The Precision of Photometrr Measurements F. Abstract No abstract available. April 1, Published: The observer can then see a circular disc of light from one source, surrounded by an halo from the other. Please login to set citation alerts. This cube directs lummmer 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. When the brightness are identical, the two circles become one.

Right click equation to reveal menu options. Where the prisms do not touch, total internal reflection occurs. OSA will be closed for the holidays from 21 December Function This instrument was used in comparing the lummee of an unknown source of light with that of a standard one.

The yoke is attached to a brass rod for insertion into an optical bench or other equipment. The housing is attached to a yoke on which it pivots.

By continuing to use this site, you agree to our use of cookies. Light rays from the two sources enter on either side of the box.