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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Citation lists with outbound citation links are available to subscribers only. By moving the unknown light source farther or closer to the photometer, one tries to get rid of the two distinct circles. 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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Lummer-Brodhun photometer

This cube directs the light rays coming from both sides of the disk into the eyepiece so that the user lumemr observe the light from both sources simultaneously. Journal of the Optical Society of America Vol. If you require urgent assistance, please contact Customer Service. 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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They first strike a white slab. 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. The photometer consists of an opaque screen which can be removed from a box. Journal photomwter the Optical Society of America. Please login to set citation alerts.

The yoke is attached to a brass rod for insertion into an optical bench or other equipment. Cited By You do brodhuun have subscription access to this journal.

The light that is reflected off each side of the disk is directed through a right angled prism lummmer towards a Lummer-Brodhun cube. Login or Create Account. Sc Practical Physics, pg The housing has no mechanism for adjusting the mirrors and is plain on the outside.

A Lummer-Brodhun cube is made up of two right-angled prisms that are placed with their hypotenuse sides together to form a cube. On either side of the screen are two large circular apertures in the sides of the box. The housing is attached to a yoke on which it pivots.


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Abstract No abstract available. Light from each of the two sources enters through its respective entrance and illuminates one side of the white disk. Pyotometer Precision of Photometric Measurements F. 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.

Cited by links are available to subscribers only. 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.

We’ve also updated our Privacy Notice. This item is a Lummer-Brodhun Photometer.