Mechanical acoustic actuators and methods for using these actuators to generate controlled acoustic signals to measure silent or quiet parameters are provided. One example method includes using fluid flows (whistle) and/or mechanical shocks between solids (bells) to stimulate the actuators, either proportionally from the parameter targeted for measurement or artificially modulated to create emitters. Some aspects provide for usage of the actuators within an oil and gas well or a fluid conduit, including in combination with arrays of acoustic sensors, to perform sonar array processing monitoring of acoustic wave propagation to derive properties of the media traversed.
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