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.
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.
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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.
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.
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