Abstract
The propagation of ultrasound in rotating superfluid He‐3 requires that the power dissipated be limited to a nanowatt or so. The usual transducers at these millikelvin temperatures are quartz crystals driven at resonance. They have low loss but work at only a few fixed frequencies. The thin piezoelectric polymer film PVDF is sensitive enough that it can be used below its resonance, from audio to at least 60 MHz. Its suitability at ultralow temperatures will be described. [Work supported by NSF.]
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