Inverse method to measure the breathing wave speed in a liquid-f

Details Inverse method to measure the breathing wave speed in a liquid-f Inverse method to measure the breathing wave speed in a liquid-f

1997-03-21

1998-05-26

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Testing, monitoring, or calibrating

367901, 367130, H04B 1700

Patent

active

057577218

ABSTRACT:
Disclosed is an inverse method for measuring the breathing wave speed in a iquid-filled cylindrical shell. The model used with this method is based on an experimental configuration where a shell is attached to a mechanical shaker at the forward end, which initiates longitudinal wave propagation. The resulting spatial field in the shell consists of extensional and breathing waves. End-mounted accelerometers and force transducers are used to measure the extensional wave speed. Once this is accomplished, transfer functions between five equally spaced hydrophones that are in the fluid and a forward accelerometer are recorded. These data are then combined to yield a closed form value of the complex, frequency-dependent breathing wave speed. The experiment included to validate this method is extremely easy to implement and can be executed in a short period of time.

REFERENCES:
patent: 5251183 (1993-10-01), McConnell et al.
patent: 5532979 (1996-07-01), Hansen et al.

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