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Critical Design Review Team SkyHawk. Fort Lewis College Christopher Hardrick, Peter Samuelson, Travis Lange June 24, 2010. Mission Overview Primary Objectives Collect atmospheric radiation levels
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Critical Design Review Team SkyHawk Fort Lewis College Christopher Hardrick, Peter Samuelson, Travis Lange June 24, 2010
Mission Overview • Primary Objectives • Collect atmospheric radiation levels • This collection will help us learn about the quantity of radiation in varying layers of atmosphere • Perform visible and ultraviolet spectrum analysis of the atmosphere • From the collection of UV data we plan to analyze the amount of ozone present above eastern Colorado
Theory Behind Objectives • Radiation • The atmosphere does a great job at scattering radioactive particles that enter from the sun, celestial bodies and space in general. With the increase in altitude, there is less atmosphere to scatter this radiation and is why we expect to see a more dense concentration in radioactive particles. • Ozone • Ozone in the atmosphere are particulates that absorb harmful UV rays from the sun, most strongly absorbing UV-B and UV-C. In the wavelength spectrum this equates to 100 to 320 nanometers.
Operation • Prior to Launch (On Site) • Assure full battery charge and connect in payload • Activate power switch • Close Payload • Remote access ITX • Begin script file • Script file activates camera software • Initiates both cameras • Initiates terminal for Geiger Counter data acquisition • Activates USB DAQ • DAQ begins to take in data from sensors and sends data to file saved to flash drive • Attach to flight string
Operation • Post Launch (On Site) • Open payload hatch • Turn power switch to off • Post Launch (Off Site) • Prepare battery for storage • Analyze data from USB flash memory • Get ready for LA!!
Ports for Photodiodes and Thermisters Port For Flash Memory Geiger Counter Pressure Sensor ITX PSU DAQ XYZ Accelerometer Cameras USB hub Wi-Fi Battery
Structural Overview • Structure • 3K 2x2 Twill Weave Black Carbon Fabric • Bubble aluminum sheeted insulation • Flight String • 160 PSI plastic tubing • Inner Diameter: 8 mm • Successfully used in previous launches
Subsystems Overview • Power • System has a cut off voltage of 11.5 V • Battery supplies all power to PSU • PSU supplies correct power to ITX, 13.5 V to pressure sensor and 5 V to accelerometer (all else is 5 V USB supplied) • Data Acquisition (DAQ) • USB DAQ collects voltages from 8 channels of sensors • DAQ streams data to ITX to save on flash memory • Channel 0: Pressure Sensor • Channel 1: Accelerometer X • Channel 2: Accelerometer Y • Channel 3: Accelerometer Z • Channel 4: Photodiode (VIS) • Channel 5: Photodiode (UV) • Channel 6: External Temperature • Channel 7: Internal Temperature
Subsystems Overview • Thermal • Insulation maintains temperature above -10 degrees C with heat generation from ITX radiative cooling fins • Battery must remain above 10 degrees C to supply power • Video Capture • Software maintains two cameras • Video capture is alternated between two cameras • Frame rate memory usage cannot exceed 10 GB of flash memory capacity • Memory • 16 GB Flash drive memory
Subsystems Design Drivers Thermal Power Memory
Special Requirements / Requests Would prefer to be at the top of the payload flight string in order to capture balloon burst How non-aerodynamic does a payload need to be to designate the top position?
Management • Current concentration on finishing all ITX interfacing and structure molding • Moving concentration towards sensors
Management - Budget Current Total $820
Test Plans • Planned Testing • Endurance Test • Battery testing • Run entire payload for a minimum of 2.5 hours • Drop Test • Already tested Carbon layers • Payload will be dropped from 21 foot balcony on to concrete patio • Whip test • 30 foot drop while attached to actual flight string sample • Cold Test • Run entire payload for a minimum of 2.5 hours at -20 C environment • Then at -40 C environment • Then at -80 C environment • Vacuum Test • Run payload, excluding structure, while in vacuum
Test Plans • Testing procedures • All our tests have been written out, for example: • Tests are written for each individual component in the payload as well as the five main tests present on the previous slide • Testing is scheduled for July 8th through the 16th, result analysis and repair is scheduled for July 17th through the 28th
Conclusions • Our Concerns • At the present moment we are unsure if the ITX and USB hub can power all of the usb devices • If not we are prepared to power each USB device externally • We have little experience writing script files • Typical Web Cams do not span a spectrum that dips deep in to UV • Our back up plan if the web cam cannot “see” through the 280 nm filter is to use a standard UVenus filter to capture the upper bounds of UV and use the narrow band filter over the UV Photodiode to better pin point the spectrum band we are interested in. • So far operations are moving smoothly and roughly on schedule.
