Acoustic caliper tool

Details Acoustic caliper tool Acoustic caliper tool

G - Physics

01

V

349/33, 349/4

G01V 1/40 (2006.01)

Patent

CA 1206582

ACOUSTIC CALIPER TOOL Abstract of the Disclosure An acoustic caliper tool is set forth in this disclosure. In the preferred and illustrated embodiment, acoustic transducers propagating highly directional acoustic waves transmit signals which are reflected at the interface of the borehole. An acoustic return signal is received. An acoustic swept frequency having a specific linear rate of sweep is utilized. The transmitted signal is mixed with the received signal; the frequency difference between the two is proportional to the wave transit time between transmitter and receiver. Distance of wave propagation is inferred by the frequency difference. Utilizing transducer transmitter and receiver pairs at locations around the caliper tool, the hole diameter can then be measured. Diametrically spaced pairs measure radial segments of distance to the borehole, and the transit times are converted into distance. The diameter of the tool is a fixed value. The measures are summed thereby yielding the diameter of the borehole.

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