ACOUSTIC LOGGING TOOL HAVING PROGRAMMABLE SOURCE WAVEFORMS.

摘要

An acoustic tool (24) that provides a programmable source waveform is disclosed. Acoustic logs at multiple frequencies may be acquired at a single pass. The waveform may be frequency-adapted to maximize formation response and amplitude-adapted for gain control. The tool comprises: a controller (130), a digital-to-analog controller (128), an acoustic transducer (44), and a linear driver. The digital-to-analog controller converts a digital waveform from the controller into an analog waveform. The acoustic transducer converts an electrical signal into an acoustic signal. The linear driver receives the analog waveform from the digital-to-analog controller and responsively provides the electrical signal to the acoustic transducer.