Abstract
Final objective for the acoustical microbubble spectrum analyzer is the in situ detection and analysis of microbubble populations in the ocean by measuring the differential ultrasonic velocity and attenuation between a sea water sample and a reference liquid over a continuous frequency range from 0.1 to 5.0 MHz. Ultrasonic waveguides retain these liquids. Reverberation is suppressed by using an accurate continuous frequency ramp over the range, together with frequency processing of the difference between the waveguide input and output signals. The resultant signals are logarithmically compressed. A differential attenuation output is derived from the envelope functions, and a differential velocity, from the wave periods. Several critical state-of-the-art problems have been solved, but further developmental work remains. The differential attenuation response is now sufficiently sensitive for the observation of certain microbubble phenomena. [This work supported by the Office of Naval Research.]
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
