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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Journal of the Optical Society of America Vol. When this is accomplished, the brodun of the unknown source can be calculated. The yoke is attached to a brass rod for insertion into an optical ljmmer or other equipment.

The housing has no mechanism for adjusting the mirrors and is plain on the outside. 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. If you require urgent assistance, please contact Customer Service.

The Precision of Photometric Lummfr F. Journal of the Optical Society of America. Remember me on this computer. Equations displayed with MathJax.


Function This instrument was used in comparing the brightness of an unknown source of light with that of a standard one. On either side of the screen are two large circular apertures lukmer the sides of the box. Light from each of the two sources enters through its respective entrance and illuminates one side of the white disk.

You do not have subscription access to this journal. They first strike a white slab.

Lummer Brodhun Photometer | NISCO

Privacy Terms of Use. 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. Light rays from the two sources enter on either side of the box.

Abstract No abstract available. Login or Create Account. When the brightness are identical, the two circles become one. Where they do, all the light is transmitted to the other side. This Photometer consists of a metal box with two entrances and an eyepiece as well luummer a slot which allows a white magnesium carbonate disk to be mounted between the two entrances.

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

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This website uses cookies to deliver some of our products and services as well as for analytics and to provide you a more personalized experience. What the observer sees in the eyepiece is two superimposed circles on top of each other, one smaller than the other.


Sc Practical Physics, pg Cited by links are available to subscribers only. A Lummer-Brodhun cube is made up of two right-angled prisms that are placed with their hypotenuse sides together to form a cube. Brohdun files are available to subscribers only. Right click equation to reveal menu options. 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.

The photometer consists of an opaque screen brodhkn can be removed from brodhn box.

Journal of the Optical Society of America

The housing is attached to a yoke on which it pivots. By continuing to use this site, you agree to our use of cookies. Cited By You do not lummed subscription access to this journal. References You do not have subscription access to this journal. 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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