Student Payload Choices 2009 - 2010 - PowerPoint PPT Presentation


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Student Payload Choices 2009 - 2010


Limited to about 500 grams weight. Roughly a polygonal prism with 15 cm to 20 cm long sides. Mechanical structure ... Connection to Sprites, ELVES, TGF? ... – PowerPoint PPT presentation

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Title: Student Payload Choices 2009 - 2010

Student Payload Choices2009 - 2010
  • Ballooning Unit, Lecture 7

Balloon Payload Requirements
  • Limited to about 500 grams weight
  • Roughly a polygonal prism with 15 cm to 20 cm
    long sides
  • Mechanical structure constructed from ¾
    polystyrene foam
  • Vehicle interface is a pair of strings, separated
    by 17 cm, that pass through the payload unbroken
    and secured with spring clips.
  • Need to conduct some kind of science or
    technology experiment
  • Designed, built, tested and shown to be fully
    space worthy by May 2010.
  • You will need to successfully complete three
    major reviews of your progress.
  • 48 hours after launch you will need to have
    calibrated science results from your flight and
    present your results to an audience of
    professional scientists and engineers.

Payload mechanical interface
Need to begin thinking now!
  • Given the constraints, you need to think about
    and address issues throughout the academic year
  • Here we discuss some example payloads
  • Either previously developed and flown or
  • Should be feasible to develop and fly within the
    limitations of this program
  • Your team needs to choose one of these payloads
    to work on!
  • Your team will have one month to develop your
  • Research and write the scientific background for
    your payload
  • Determine your mission goals, objectives and
  • Establish a general schedule for payload
  • Pre-PDR document is due November 25, 2009
  • Pre-PDR oral presentation is due December 1, 2009

Payload Choices for 2009-2010
  • Temperature, pressure, humidity and imaging
    characteristics of the atmosphere structure One
    team must do this one
  • Radiation Intensity as a function of altitude
  • Coordinate observations with payload topic 3
  • Electrical conductivity of the atmosphere as a
    function of altitude
  • Coordinate observations with payload topic 2
  • Measure intensity of UV bands as function of
    altitude to deduce properties of ozone layer
    Related to 5
  • Coordinate observations with payload topic 5
  • Directly measure concentration of ozone and NOx
    gases as a function of altitude using solid state
    ITO sensor Related to 4
  • Coordinate observations with payload topic 4
  • Investigate thermal flow and conductivity of
    boundary layer around payload
  • Investigate methods to optimize atmospheric
    temperature measurements
  • Develop an inertial sensing system which will
    provide sub-minute of arc orientation knowledge

1. Characteristics of the Atmosphere
  • The temperature and pressure of the atmosphere
    varies as a function of altitude.
  • Temperature initially decreases with increasing
    altitude, then increases as UV is absorbed in the
  • Pressure decreases in an exponential manner
  • This payload would implement temperature,
    pressure and humidity sensors to measure this
  • Need to understand sensor ADC range accuracy.
  • Compare with standard atmosphere model

1. Characteristics of the Atmosphere
  • Provide high definition video of ground or Earth
    limb from low to high altitude
  • Coupled with the temperature, pressure and
    humidity sensors this payload provides basic
    information about the flight
  • Payload would fly a digital video camera and be
    automatically controlled to take a series of
    video segments
  • May need to include a polarizing filter to cut
    down on glare
  • Need to record images on non-volatile media to
    avoid loss during power off
  • Meeting the power and weight constraints will be
    a challenge

2. Radiation Intensity vs Altitude
  • Cosmic rays are high energy nuclei that originate
    outside our solar system.
  • CR interact in Earths atmosphere producing a
    shower of particles
  • The intensity of this radiation varies with
  • This payload would determine the radiation flux
    as a function of altitude on ascent and descent
  • Two sensors to implement and compare
  • Geiger-Muller tube
  • Scintillator and solid state PM
  • Coordinate observations with atmosphere
    conductivity payload

3. Conductivity of Atmosphere
  • Investigate the ion content of the atmosphere as
    a function of altitude
  • Provides fundamental knowledge of the Earth
    electrical field
  • Is the level of ionization related to cosmic ray
  • How to clouds affect the field?
  • Connection to Sprites, ELVES, TGF???
  • Use a pair of cylindrical capacitors to measure
    positive and negative charges
  • Potentially very sensitive to noise
  • Need very careful design work and calibrations
  • Coordinate observations with radiation

4. Intensity of UV versus Altitude
  • UV is absorbed by ozone in the upper atmosphere
  • Payload would measure the UV intensity as a
    function of altitude and infer the vertical
    distribution of ozone
  • One or more sensors (or the appropriate
    wavelength sensitivity) would monitor UV from the
  • The signal from the sensor would need to be
    conditioned and converted to a digital number by
    an ADC
  • You will need to take into account rotation of
    the balloon craft
  • Calibrations of sensor and ADC will be needed to
    determine flux

5. Direct Measurement of Ozone
  • Use solid state ITO sensor to directly measure
    Ozone and NOx concentration
  • Sensor changes resistance in proportion to the
    gas concentration
  • Collaborate with the University of North Florida
    to obtain the sensors
  • Need to keep sensor at constant temperature
  • Need to develop interface electronics and
  • Coordinate with payload topic 4

Single ITO Sensor
Expected Ozone Concentration
HASP 2008 Flight Result
6. 7. Thermal Investigations
  • Investigate thermal flow conductivity of
    boundary layer around payload
  • Temperature sensors on box interior, interior
    surface, exterior surface, 5 cm boom and 10 cm
  • Determine heat flow and the payload effect on
    measuring the temperature of the atmosphere.
  • Optimizing thermal shields for temperature
  • Temperature sensors on 10 cm booms with white,
    black, checkered and silver shields
  • Measure and model the atmospheric temperature
    measured by the four sensors

8. Minute of Arc Inertial System
  • Develop an inertial attitude sensing system that
    would be accurate to less than one minute of arc
  • Use to investigate the rotation and turbulence of
    the payload during flight
  • Use some combination of magnetometer compass,
    tilt sensors, fiber-optic gyroscopes,
    accelerometers and a sun sensor
  • Develop system that would determine payload
    attitude to about one arc-minute
  • Correlate observed turbulence with atmosphere

  • By 5 p.m. Tuesday November 3 e-mail to me your
    first second payload choices.
  • Include the following in the body of your e-mail
  • Your name
  • Your team designator
  • First priority payload type (i.e. from slide 4
  • Second priority payload type
  • The kind of role (e.g. software, electronics,
    design, management) you see for yourself on the
    payload team