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 from each of the two sources enters through its respective entrance and illuminates one side of the white disk. OSA will be closed for the holidays from 21 December By moving the unknown light source farther or closer to the photometer, one tries to get rid of the two distinct circles. When this is accomplished, the luminosity of the unknown source can be calculated.

Similar to the Weber Photometer this item broduhn designed to compare the brightness of an unknown light source to the brightness of a standard light source.

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. Privacy Terms of Use. They first strike a white lunmer. This website uses vrodhun to deliver some of our products and services as well as for analytics and to provide you a more personalized experience.

The Precision of Photometric Measurements F. The yoke is attached to a brass rod for insertion into an optical bench or other equipment.


Lummer Brodhun Photometer | NISCO

Light rays from the two sources enter on either side of the box. Citation lists with outbound citation links are available to subscribers only. Journal of photomeher Optical Society of America. We’ve also updated our Privacy Notice.

Login or Create Account. Figure files are available to subscribers only. The housing has no mechanism for adjusting the mirrors and is plain on the outside. Not Accessible Your account may give you access.

phogometer You may subscribe either as an OSA member, or as an authorized user of your institution. Click here to see what’s new. When the brightness are identical, the two circles become one.

What the observer sees in the eyepiece is two superimposed circles on top of each other, one smaller than the other. April 1, Published: Equipment of Class Rooms. You do not have subscription access to this journal. This Photometer consists of a metal box with two entrances and an eyepiece as well as a brodhum which allows a white magnesium carbonate disk to be mounted between the two entrances. A Lummer-Brodhun cube is made up of two right-angled prisms that are placed with their hypotenuse sides together to form a cube.

Where the prisms do not touch, total internal reflection occurs.

Lummer Brodhun Photometer

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The housing is attached to a yoke on which it pivots. This lumer 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 observer can then see a circular disc of light from one source, surrounded by an photomerer from the other. Photometfr light that is reflected off each side of the disk is directed through a right angled prism and towards a Lummer-Brodhun cube.


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 lumer box. Click here to learn more. For a fuller description, see the following website. Where they do, all the light is transmitted to the other side. Remember me on this computer. Equations displayed with MathJax.

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 which can be removed from a box. Sc Practical Physics, pg References You do not have subscription photometerr to this journal. If you require urgent assistance, please contact Customer Service. On either side of the screen are two large circular apertures in the sides of the box.

This item is a Lummer-Brodhun Photometer. Cited By You do not have subscription access to this journal. Figures 3 You do not have subscription access to this journal. Right click equation to reveal menu options.