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“i-Heliograph”. Can we make a low power data transmitter to send “lots” of data from the moon to the earth using a 19th century idea enhanced with 21st century technology? How does such a system compare to laser communication?. Replace this guy with a avalanche photodiode and an ethernet port.

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i heliograph
“i-Heliograph”
  • Can we make a low power data transmitter to send “lots” of data from the moon to the earth using a 19th century idea enhanced with 21st century technology?
  • How does such a system compare to laser communication?
slide3

Replace this guy with a avalanche photodiode and an ethernet port..

Replace this guy with a high speed optical modulator and an ethernet port.

replacing the guy wiggling the mirror
Replacing the guy wiggling the mirror
  • Voltage Controlled LCD displays (KHz Speeds?)
  • Acoustic Optical Modulators (speeds up to 100 MHz)
there should be a power savings compared to laser comm
There should be a power savings compared to Laser Comm
  • Lasers are ~10% efficient on producing optical output from electricity it gathers from ~25% efficient solar cells.
    • Total efficiency from sun = 0.25 * 0.1 = 2.5%
  • Mirrors are ~90% reflective
other factors in comparison
Other factors in comparison
  • Mass to moon
    • Do solar cells and power system with Laser weigh more than a mirror and heliostat?
  • Reliability
    • Solar panels, motors, AOMs…
    • Is dust an issue?
2009 olin job
2009 Olin Job
  • Build a Heliostat to capture the sun
  • Pipe the light from the Heliostat through either an accoustic optical modulator or a LCD retarder
  • Build a simple pulse frequency modulator to drive the AOM or LCD retarder
  • Build a demodulator to read the output of an APD
  • Predict performance and compare to Laser Comm.
gsfc will provide
GSFC will provide
  • A telescope base to make a heliostat
  • An AOM to modulate light
  • A Circuit design to produce a FM Pulse train
  • A Telescope for the receive end
  • An APD (maybe dual use the one for the MCA project)
  • The demodulator design.
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