Transcript Document

StuMURD
Student Made Ultraviolet
Radiation Detector
Presented for your approval by:
THE LATE BALLOONERS
To measure the intensity of
ultraviolet (UV) electromagnetic
radiation during the payload’s ascent
through the stratosphere
BASIC STAMP
HOBO
ADC
Photo detector 1
Photo detector 4
Photo detector 2
Photo detector 3
The StuMURD photo
detectors
SiC - Photodiode JEC 0.3S
-spectral range 210 - 380 nm
-active area 0.22 mm²
-UV-responsivity 0.13 A/W
Orientation of Photo detectors
• There will be four
separate photodiodes
placed at the four
upper corners of the
payload box. They
will be angled
upwards and placed
behind protective
transparent plates.
• This configuration will assure that at least one photodiode
will be directly facing the sun, regardless of the balloon’s
orientation to the sun.
Electrical Design
FABRICATION AND TESTING
1. An algorithm for data storage needs to be devised and tested. It must
allow for room for the program and efficiently fill available memory.
2. Next, the multiplexing ADC, op amps, and photodiode circuits need
to be integrated together and to the Basic Stamp. A diode of similar
voltage tolerance, but at a lower price than the photodiodes should be
used to test whether the circuits are functioning properly.
3. The final step of the StuMURD circuit fabrication will be adding the
UV-photodiodes.
4. Testing will involve finding the diode’s maximum intensity detection
level that yields useful results.
5. The HOBO is not dependent on any of the above systems and can be
tested and calibrated upon its arrival.
Mission Operations / Data Analysis
•
Before launch StuMURD must be powered and will begin to gather data. The
heat sources must be activated and placed in the payload. The payload must
then be sealed and prepared for launch.
•
StuMURD's measurements are self-contained and will not need any action or
input from us on the ground during the flight.
•
Following recovery of the payload, StuMURD's data, saved in on-board
memory, will be downloaded to PC using the serial cable connection on the
Basic Stamp board. Also, the HOBO data will be downloaded to PC using it's
serial connection. These sets of data will be correlated with the telemetry data
to yield all applicable analysis and extrapolations.
WEIGHT BREAKDOWN
Item
Box
Mass (g)
125
4 UV detectors
15
HOBO
29
Batteries
182
Additional Board w/components
75
Heater
60
Main Board (Basic Stamp)
43
Total
529
Power Consumption
Component Voltage Current Power
Basic Stamp
ADC
Op Amps
EEPROM
Photodiodes
Total Power
5V
60mA
300mW
5V
3mA
15mW
6V
12000pA .0004mW
5.0V
3mA
15mW
negligible
0
330mW
BUDGET
Item
UV detectors
HOBO
ADC/Multiplexor
Memory Chip
Materials for box
Op Amps (quad chip)
Battery
Diodes for testing
Basic circuitry
TOTAL
* Estimated costs
Part #
Retailer
Qty Each
JEC 0,3S
lasercomponentsusa.com 4 $66.00
H08-002-01
Onset
1 $65.00
ADC0834
1
$6.00
556AT24C2561OP12.7
Mouser
1
$4.71
various parts
Home Depot
$50.00
TBD
Digikey
1
$1.84
9V Energizer max
Walmart
4
$7.00
TBD
TBD
4
various minor parts
TBD
$20.00
Cost
$264.00
$65.00
$6.00
$4.71
0
$1.84
$28.00
$0.00
$0.00
$369.55
Schedule / Milestones
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Milestones:
2/14/03 Abstract and WBS completed
2/20/03 Mechanical, Electrical, and Software designs completed
2/23/03 Staffing plan and budget completed
2/25/03 PDR completed
2/27/03 Present PDR
3/01/03 Detectors ordered
3/18/03 CDR completed
3/27/03 CDR submitted
3/28/03 Short lead items (circuitry components) ordered
4/10/03 Circuitry completed
4/20/03 Software Integration completed
4/25/03 Box construction completed
5/01/03 FRR
5/18/03 Flight
TASK ASSIGNMENTS
ACES
Panel
Team
Leader
L. Johnson
Project
Management
Payload
Design
T. Brown
L. Johnson
Accounting
Timeline
T. Brown
D. Rodriguez-hart
Data Analysis
T. Brown
Mechanical
Software
T. Brown
L. Johnson
Data
Acquisition
L. Johnson
Electrical
D. Rodriguez-hart
Work Load
L. Johnson
Thermal
System
Results
L. Johnson
D. Rodriguez-hart
T. Brown
Comparisons
Summary
D. Rodriguez-hart
T. Brown