Abstract
An acoustic well logging system is provided for measuring the speed of propagation of all acoustic wave propagation modes of earth formations penetrated by a borehole simultaneously. A linearly changing frequency swept acoustic signal is generated and received at a spaced distance apart in a borehole. The received signal is mixed in a product forming device with the transmitted signal. Mixer product signals are low pass filtered to remove high frequency components and the resultant signals spectrum analyzed. Frequency spectra components may then be interpreted directly in terms of speed of propagation of various acoustic energy wave propagation modes.
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