Preliminary Design Review Thermal Wireless Sensor

Presentation Outline Project Goals and Scope Deliverables Project Risks and Challenges Specifications Wireless Architecture Decision Matrix Prototypes Cost Estimation Project Timeline

Project Goal Design and Build a wireless system that will be imbedded in a heat shield material to measure temperature on atmospheric entry.

Scope Primary Focus: The main focus of our project will be to design the wireless transmission of the thermocouple signal Secondary Considerations –Thermocouple Correction and Amplification circuit –Data Acquisition

Deliverables Evolution of several designs Characterization of the system and how it responds to environmental noise Verification of signal to a similar “wired” system Wireless system imbedded into heat shield material

Project Risks and Challenges Transmission through RF non-transparent material Transmission through a high interference environment Protection of wires and circuits at high temperatures Machining hazardous material Meeting required size specifications

Specifications and Constraints TypeSpecsPriority No. of Comm. Channels41 No. of Thermocouples41 Sensor PlacementCenter Embedded1 Data CollectionMicrosoft Excel1 Data RateSample Every Second1 Data TransferReal Time1 Power Source< 9 V1 System Life Power2 years1 Bandwidth1 – 10Hz2 Temperature Resolution+/- 5 degrees Celsius2 Noise Interference???2 Temperature Range0 – 1000 degrees Celsius2 Transmitter Size5” x 4” x 2”3 Weight16 oz (Heat Shield Side)3 VibrationLow Susceptibility3

Wireless Architecture Decision Matrix RFNFMCLED SizeComparable Power ConsumptionHighestPotentially NoneMedium Ability to Transmit PowerNoYesNo Transmission TypeRFMagnetic CouplingLight Emission Transmission Distance40 meters2 meters10 meters Needs Line of SightNo Yes Noise ImmunityLowHigh CostHighestLowestMedium Commercial AvailabilityHighestNoneMedium

Prototypes

Cost Estimation PartDescriptionPriceQnt.Total Thermocouple Wire Maxim Thermocouple CJC and A/D Converter Wireless Transmitter~50.004~ Wireless Receiver~50.004~ Dataq Digital Data Acquisition Total~500.00

Project Timeline