Bulletin of the American Physical Society
85th Annual Meeting of the APS Southeastern Section
Volume 63, Number 19
Thursday–Saturday, November 8–10, 2018; Holiday Inn at World’s Fair Park, Knoxville, Tennessee
Session D05: Poster Session (6:00pm-7:30pm)
6:00 PM,
Thursday, November 8, 2018
Holiday Inn Knoxville Downtown
Room: Atrium
Abstract ID: BAPS.2018.SES.D05.75
Abstract: D05.00075 : Detecting a Small LED Signal in a Noisy Environment with a Lock-in Amplifier
Presenter:
Thomas Dixon
(Francis Marion University)
Authors:
Thomas Dixon
(Francis Marion University)
Nicholas Tomlinson
(Francis Marion University)
R. Seth Smith
(Francis Marion University)
As the distance was increased, the output signal from the photodiode detector became very small.
At some distance, the noise signal became larger than the LED signal, so that the LED signal
was no longer observable. Lock-In Detection was used to maximize the signal-to-noise ratio for
the output of a photodiode detector so that we could “pull” the very small LED signal out of a
noisy environment. The photodiode output signal was connected to a TeachSpin Signal
Processor/Lock-In Amplifier apparatus, which was used to explore methods of filtering,
averaging, and lock-in amplification. The output signal from this apparatus was analyzed on a
Tektronix TBS 1052B Dual Channel Digital Oscilloscope.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.SES.D05.75
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