Student Made Ultraviolet Radiation Detector

Presented for your approval by:

THE LATE BALLOONERS

StuMURD

To measure the intensity of ultraviolet (UV) electromagnetic radiation during the payload’s ascent through the stratosphere

BASIC STAMP

ADC

Photo detector 1 Photo detector 4

Photo detector 3Photo detector 2

HOBO

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

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.

FABRICATION AND TESTING

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 Mass (g)

Box 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 PowerBasic Stamp 5V 60mA 300mW

ADC 5V 3mA 15mWOp Amps 6V 12000pA .0004mWEEPROM 5.0V 3mA 15mW

Photodiodes 0

Total Power 330mW

negligible

Item Part # Retailer Qty Each Cost

UV detectors JEC 0,3S lasercomponentsusa.com 4 $66.00 $264.00HOBO H08-002-01 Onset 1 $65.00 $65.00

ADC/Multiplexor ADC0834 1 $6.00 $6.00Memory Chip 556AT24C2561OP12.7 Mouser 1 $4.71 $4.71

Materials for box various parts Home Depot $50.00 0Op Amps (quad chip) TBD Digikey 1 $1.84 $1.84

Battery 9V Energizer max Walmart 4 $7.00 $28.00Diodes for testing TBD TBD 4 $0.00

Basic circuitry various minor parts TBD $20.00 $0.00

TOTAL $369.55

* Estimated costs

BUDGET

Schedule / Milestones• 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

ProjectManagement

T. Brown

Data AnalysisT. Brown

ACESPanel

TeamLeader

L. Johnson

PayloadDesignL. Johnson

MechanicalT. Brown

ThermalL. Johnson

SoftwareL. Johnson

SystemD. Rodriguez-hart

ElectricalD. Rodriguez-hart

AccountingT. Brown

Work LoadL. Johnson

TimelineD. Rodriguez-hart Data

AcquisitionL. Johnson

ComparisonsD. Rodriguez-hart

SummaryT. Brown

ResultsT. Brown