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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Light rays from the two sources enter on either side of the box. This Photometer consists of a metal box with two entrances and an eyepiece as well as a slot which allows lummee white magnesium carbonate disk to be mounted between the two entrances. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Lummer Brodhun Photometer | NISCO

If you require urgent assistance, please contact Customer Service. Light from each of the two sources enters through its respective entrance and illuminates one side of the white disk.

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. This item is a Lummer-Brodhun Photometer. Not Accessible Brodhuj account may give you access. Right click equation to reveal menu options.


File:Photomètre Lummer-Brodhun.png

The Precision of Photometric Measurements F. The observer can then see a circular disc of light from one source, surrounded by an halo from the other. 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.

They first strike a white slab. Equations displayed with MathJax. Figure files are available to subscribers only. Citation lists with outbound citation links are available to subscribers only. Sc Practical Physics, pg Function This instrument was used in comparing the brightness of an unknown source of light with that of a standard one. By continuing to use this site, you agree to our use of cookies. Journal of the Optical Society of America.

The light that is reflected off each side of the disk is directed through a right angled prism and towards a Lummer-Brodhun cube. A Lummer-Brodhun cube is made up of two right-angled prisms that are placed with their hypotenuse sides together to form a cube. OSA will be closed for the brdhun from 21 December April 1, Published: In the box above the screen are two mirrors and a pair of prisms, which direct the light from the lunmer light sources outside the box into the eyepiece at the top of the box.

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

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The housing is attached to a yoke on which it pivots. By moving the unknown light source farther or closer to the photometer, one tries to get rid of the two distinct circles. Where the prisms do not touch, total internal reflection occurs. Privacy Terms of Use. By matching the brightnesses of puotometer 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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Equipment of Class Rooms. When this is accomplished, the luminosity of the unknown source can be calculated. Remember me on pyotometer computer. Password Forgot your password? The photometer consists of an opaque screen which can be removed from a box. When the brightness are identical, the two circles become one. References You do not have subscription access to this journal.