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Proceedings Paper

Liquid crystal intensity modulator for simulating planetary transits
Author(s): Greg Kopp
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Paper Abstract

I describe a liquid crystal intensity modulator designed to achieve <10 parts per million (ppm) modulation to simulate a planetary transit like those required for ground testing of NASA's Kepler mission. The design uses a nematic liquid crystal as a variable retarder aligned between two linear polarizers, with the retardance values and the alignment chosen to provide low sensitivity of transmitted intensity to input liquid crystal voltage variations. Modulator test results give intensity fluctuations of a few ppm from millivolt modulations about the input 8 V baseline voltage.

Paper Details

Date Published: 19 November 2003
PDF: 12 pages
Proc. SPIE 5170, Techniques and Instrumentation for Detection of Exoplanets, (19 November 2003); doi: 10.1117/12.504521
Show Author Affiliations
Greg Kopp, Univ. of Colorado/Boulder (United States)

Published in SPIE Proceedings Vol. 5170:
Techniques and Instrumentation for Detection of Exoplanets
Daniel R. Coulter, Editor(s)

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