passive transducer

passive transducer

[′pas·iv tranz′dü·sər]
(electronics)
A transducer containing no internal source of power.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The primary, component of the SFD is a proprietary passive transducer that responds to energy associated with subsurface stress.
The SFD is a quantum physics-based passive transducer that responds to energy released by subsurface phenomenon under stress.

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