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Mission› Will detect gravitational waves within a
frequency range from 0.03 mHz to above 0.1 Hz
Structure› Three spacecraft in equilateral triangle
with 5 million km sides
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http://www.nasa.gov/centers/goddard/images/content/181573main_lisa_LO.jpg
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Optical device for measuring angles
Basic idea is to image something on a camera and measure the deflections of the image
Laser
Beam splitterCCD or other readout device
Lens Mirror
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Dynamic range of 1°
Noise level of 1nrad/√Hz
Work at a distance of 1m
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Instead of point source of light, use a grating
Instead of imaging just one grating, image three—two stationary reference patterns and one dynamic pattern
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LED w/ diffuser
CCD Camera
Beamsplitter Lens Two Beamsplitters
Mirror
Grating
Top View
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Side View (sort of)
Red LED
Paper Diffuser Grating
CCD Camera
Lens w/ aperture Mirror
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Camera
Light with diffuser and grating
Lens with aperture
Mirror
High-tech light-shielding device
6/23/09
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double black line in the grating
converging lens between the LED and the grating› Allowed us to get rid of the diffuser
Switched from red (627nm) LED to green (530nm) LED
Encased the whole thing in Styrofoam
Instead of 3 images, just use 1 reference pattern and 1 dynamic pattern (so only one beamsplitter at the end rather than two)
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Green LED light source
CCD Camera
50R/50T Beamsplitter
Grating w/ 135 μm slits
450mm Planar-Convex Lens
40R/60T Beamsplitter
Mirror
Auxiliary lens
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LED
Camera
Auxiliary Lens
Grating
50R/50T beam splitter
Main Lens
40R/60T beam splitter
Mirror
High-tech light-shielding device
8/16/09
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8/11/09
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Reference Pattern
Main Pattern
Double black line
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Dynamic range› We can move our pattern across the length of
the camera (3648 pixels)
› only limited by the size of the pattern
› about 25 peaks in each pattern
Operating distance› still able to get a clear pattern at 1m
› The mount was so unstable though, the noise was useless to measure
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8/12/09
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We have shown that some of our noise is coming from fluctuations in the magnification of the image
Possible causes:› Most likely the expansion and contraction
of our grating, which is composed of thin plastic
› Vibrations might be causing tiny physical movements of the optical components
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Test photomask grating Stabilize mirror and beam splitter
mounts Find the best way to take advantage of
the reference pattern in the data analysis
Photomask AutoCAD drawing with test patterns
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Make the setup more compact› Folding the beam path› Finding the ideal size for the main lens—as
small as possible without sacrificing the quality of the image
Design stable mounting structure and housing for the device
While it’s being designed for LISA, its low noise level and large dynamic range make it useful for a variety of applications
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I’d like to thank› my advisors, Jens Gundlach and Stephan
Schlamminger, as well as everyone at CENPA
› The REU directors, Wick Haxton, Warren Buck, and Deep Gupta, as well as Janine Nemerever and Linda Vilett for providing such a great REU experience