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About RF Cafe
Copyright: 1996 - 2024 BSEE - KB3UON RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived... All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowl My Hobby Website: |
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Piezoelectric Foam
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1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 Piezoelectric Foam Piezoelectric foam? Researchers have discovered that polypropylene foam (used widely in packaging) acquires piezoelectric properties after it is zapped with several thousand volts. Air in the pores break down into electrons and positively charged ions that cling to opposite walls of the cavities. It is already being used in keypads and musical instrument pickups. Future applications include conformable ultrasound arrays for medical instrumentation and even embedded ultrasonic "bar code" type configurations built into products for security and identification. The only drawback that needs to be overcome is the material loses its piezoelectric properties above 55° C. |
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