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

The StuMURD photo detectors SiC - Photodiode JEC 0.3S -spectral range 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 ItemMass (g) Box125 4 UV detectors15 HOBO29 Batteries182 Additional Board w/components75 Heater60 Main Board (Basic Stamp)43 Total529

Power Consumption

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