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Telemetry Applications Group Critical Design Review

Telemetry Applications Group Critical Design Review. December 1, 2003 Florida Institute of Technology. Project Overview. Device is an acoustic telemetry system Provides user with location and depth information Signal is audible to the user (min. 10 msec) Pulse width encodes depth data

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Telemetry Applications Group Critical Design Review

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  1. Telemetry Applications GroupCritical Design Review December 1, 2003 Florida Institute of Technology

  2. Project Overview • Device is an acoustic telemetry system • Provides user with location and depth information • Signal is audible to the user (min. 10 msec) • Pulse width encodes depth data • Depth data is interpreted by software • GUI allows user with laptop to capture data at will

  3. The TAG Team

  4. Design Signal Flow Signal Source (MAX038) Modulating Switch (ISL43112) Modulating Switch (ISL43112) Output Buffer (HA-5002) Projector (CTG811-0260) V – F Converter (VFC32KP) 1Hz SW, 50% duty cycle (MAX038) Low Noise Amp (TLC27M2) Pressure Transducer (MOT2202)

  5. Design Description • Pressure transducer output voltage linear as a percentage of full scale • Voltage to Frequency converter output is a square wave with frequency proportional to the input voltage and 50% duty cycle • V – F converter output frequency varies between 2.4 Hz and 50 Hz, which is equivalent to a pulse duration of 210 msec and 10 msec, respectively • The converter output then closes the normally open switch, allowing the signal to pass for a number of milliseconds that is proportional to the pressure data • To prevent wasting energy and driving the listener crazy, the modulated signal is gated by 1 Hz square wave to allow 0.5 second transmit windows.

  6. Software Description • User desires actuator to capture data • SW must measure signal pulse duration • Perform translation to recover depth data • MATLAB most likely solution • Interface with Excel for data logging • Automatic back up for data

  7. Testing The Tag • Prototype tested in air in lab to determine: • Power Consumption • Signal Characteristics and output power • Prototype field tested to get baseline numbers • Final device size and density requirements may require slight redesign

  8. Risk Mitigation(or how to keep Dr. Ports happy) • Build Risks • All parts available commercially with no lead time • Test Risks • Must field test; need accessible waterproof casing • Must schedule time for use of test platform (boat) • Financial Risks • All “known” costs do not exceed $200/ unit • But the unknown???

  9. Financial Status • Cost per device less than $200 as designed • No money spent yet, which leaves us with: • National Collegiate Inventors Alliance (NCIIA) • Portion of $20,000 grant available • Aramco Company • $1000 grant already received by development office

  10. Time budget per member

  11. Q & A • Please visit our website at: http://www.fit.edu/projects/TAG

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