Transcript Team Name
RockSat 2010 Harding Flying Bison RockSat-C Rocket Team Harding University Ethan Lilly, Eric Locke, Darah McDaniel, Ed Wilson June 22, 2011 Team Organization Ethan Lilly Software Design Darah McDaniel Fabrication & Spectroscopy Edmond Wilson Finances & Logistics Team Mentor David Stair Graphics & Design Technician Eric Locke Electronics & Testing Mission Overview The goal of this mission is to measure the absorption spectrum of Earth’s atmosphere as a function of altitude using a mini-spectrometer as a science payload onboard a NASA Terrier-Orion rocket that will reach an altitude of 72 miles, the edge of the atmosphere. Block Diagram of System Power Distribution System Signal Conditioner for CCD Array Battery Power Supply G-Switch UV/VIS Spectrometer Embedded Controller with 2 GB Memory Fiber Optic Cable Signal Conditioner for Photodiode RBF Lens PD Atmospheric Spectrometer Spectrometer Electrical System • The electrical system is composed of three major circuits. – G-switch and power supply circuit – Photodiode amplifier circuit – Spectrometer signal conditioning circuit G-switch and Power Circuit LED1 R5 10kΩ Key = Space R1 J1 G-Switch MTD6P10E Q1 RBS R4 G 10kΩ D D2 1N4001GP S 100kΩ D1 1N4001GP Battery x 2(pos) V1 9V Q2 R2 9V_out 10kΩ R3 10kΩ 2N2222A Op-amps U1 NCP1117DT50G 3 C1 1.0µF VREF VS+ OUT GND 1 4 Battery (neg) 5V_out C2 0.1µF V2 9V R7 100Ω Photodiode Amplifier Circuit V2 9V V5 9V R1 7 1 3 U1 6 Photodiode V1 0.3 V 2 741 R2 U2 2 6 1kΩ 741 3 7 4 V3 9V 2kΩ 4 5 1 V4 9V 5 V_out Spectrometer Conditioning Circuit Spectrometer Output V3 7 -1 V R1 7 5 R4 U1 6 10kΩ V2 Battery 9V 3 1 2 R2 80kΩ Non-inverting Summer R3 10kΩ Voltage Follower V1 Battery 9V 1 5 Vout = U2 (Spectrometer output - 1) 3 10kΩ 6 2 741 741 4 4 R5 10kΩ R6 10kΩ A/D converter input range: 0 to +1.25V Input: +1.3 to +2.1V Output: +0.3 to +1.1V Sony ILX511 CCD Linear Array Timing Diagram Fluorescent Light Spectrum 9000000 8000000 7000000 6000000 5000000 4000000 3000000 2000000 1000000 0 240 340 440 540 Wavelength (nm) 640 740 840 Experimental Solar Spectrum 9000000 Oxygen 8000000 7000000 Water Vapor 6000000 5000000 4000000 3000000 2000000 1000000 0 240 340 440 540 Wavelength (nm) 640 740 840 Integration With Temple University – Lessons Learned • Fast A/D conversion is necessary for spectroscopy • Communication between disciplines is key in problem solving – Advice for Next Year: • Allow time for overcoming problems and testing • Design everything before building • Test everything several times – What was the hardest part? • Learning to work with a new microcontroller Conclusions - We were able to accomplish this project as a team. This project would be very difficult for any one person to accomplish alone. - We learned a great deal about carrying out a complete project. - We are proud of our payload and hope to recover valuable data. Acknowledgement • Arkansas Space Grant Consortium • NASA Workforce Development Scholarship Program • RockSat-C Program • Wallops Island Flight Facility