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Low Cost 40Mhz RF Power Meter

Low Cost 40Mhz RF Power Meter. Group: DEC13-04. Team DEC13-04 Composition. Students: Jason Danielson Jiwei Xia Tyler Christesen Yilun Ji Client : Dan Stieler PowerFilm, Inc Advisor: Dr. Ayman Fayed. PowerFilm Solar.

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Low Cost 40Mhz RF Power Meter

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  1. Low Cost 40Mhz RF Power Meter Group: DEC13-04

  2. TeamDEC13-04 Composition • Students: Jason Danielson Jiwei Xia Tyler Christesen YilunJi • Client : Dan StielerPowerFilm, Inc • Advisor: Dr. Ayman Fayed

  3. PowerFilm Solar • Uses RF Power generators to determine the amount of material that is applied to thin-film solar cells • Too much or too little power results in efficiency and quality issues

  4. Client Requirements • A through-line RF power meter able to accurately detect a 40MHz pulsed signal • Digital output and display • Logging software for up to 20 devices

  5. Commercial Product Drawbacks • Mechanical display only available on the meter itself • No way to monitor or troubleshoot problems • Expensive Bird 43 Watt Meter

  6. The Plan • Use existing technology and improve on it with value added features • Analog signal  Digital signal • Attach an LCD to the meter • Send data to logging software

  7. The Structure RFGenerator Wireless LAN Transmission Bird 43 Watt Meter Microcontroller

  8. Bird Meter (Bird Model 43) • Company Bird Model 43 bird Technology Company • Price 200 dollars each

  9. How it connects to generator and output device • Example • Plug in element (Slug)

  10. Direction of the arrow shows we are measuring forward power

  11. Circuit Structure

  12. MSP430 Launchpad • Microcontroller uses • Driving LCD • ADC (Analog to Digital conversion • Sending Data to Computer

  13. Driving LCD From MSP430 Launchpad 5V 16x2 character LCD Set up in 4 bit mode, send 4 upper bits of byte then the 4 lower bits. Used to display the digital reading of the ADC

  14. ADC ADC Step Vs. Input Voltage 10 bits of resolution (2^10=1024 steps) 0-3.6V sensitive Results in 3mv each step ADC Step Input Voltage

  15. Inner structure Step 1 step 2 step 3

  16. Collected Data: Power VS current

  17. Data Plots: Power VS current

  18. Collected Data: Power VS Voltage

  19. Collected Data: Difference in the two meters

  20. Software

  21. Questions?

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