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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On either side of the screen are two large circular apertures in the sides of the box. The Precision of Photometric Measurements F.

Where the prisms do not touch, total internal reflection occurs. When the brightness are identical, the two circles become one. For a fuller description, see the following website. If you require urgent assistance, please contact Customer Service. Cited by links are available to subscribers only. Journal of the Optical Society photomter America Vol. They first strike a white slab. This website uses cookies to deliver some photometeer our products and services as well as for analytics and to provide you a more personalized experience.

Lummer Brodhun Photometer – (SIPO-005)

Journal of the Optical Society of America. By moving the unknown light source farther or closer to the photometer, one tries to get rid of the two distinct circles. Remember me on this computer.


Figure files are available to subscribers only. OSA will be closed for the holidays from 21 December Sc Practical Physics, pg Equipment of Class Rooms. Citation lists with outbound citation links are available to subscribers only.

112 – Lummer- Brodhun Photometer

You may subscribe either as an OSA member, or as an authorized user of your institution. Click here to learn more. The observer can then see a circular disc of light from one source, surrounded by an halo from the other.

References You do not have subscription access to this journal. A Lummer-Brodhun cube is made up of two right-angled prisms that are placed with their hypotenuse sides together to form a cube. Login or Create Account. Privacy Terms of Use. This cube directs the light rays coming from both sides photomster the disk into the eyepiece so that the user can observe the light from both sources simultaneously.

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. Not Accessible Your account may give you access. Where they do, all the light is transmitted vrodhun the other side. Light from each of the two sources enters through its respective entrance and illuminates one side of the white disk. We’ve also updated our Privacy Notice.


Please login to set citation alerts. The photometer consists of an opaque screen which can be removed from a box. April 1, Published: Password Forgot your password?

This Photometer consists of a metal box with two entrances and an eyepiece as well as a slot which allows a white magnesium broxhun disk to be mounted between the two entrances. Right click equation to reveal menu options. What the observer sees in the eyepiece is two superimposed photmeter on top of each other, one smaller than the other. This item is a Lummer-Brodhun Photometer.

When this is accomplished, the luminosity of the unknown source can be calculated.

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

You do not have subscription access to this journal. Light rays from the two sources enter on either side of the box. The light that is reflected off each side of the disk is directed through a right angled prism and towards a Lummer-Brodhun cube. 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 have subscription access to this journal.