Abstract
An impedance tube ( Brüel & Kjaer type 4002), originally designed for air acoustic measurements, was modified for use in making attenuation measurements on ocean bottom sediment samples. The measurements are made by placing sediment samples in holders terminated by a reflector plate, the length of which is selected to be equal to the sample length times the ratio of the sound velocity in the plate to the approximate velocity in the sediment. Since sound velocities for most sediments vary from about 1300 to 1700 m/sec, it appears that variations in reflectivity with frequency, which are a function of sediment velocity and attenuation, may be measured with this technique. The present technique differs from other methods used for sediment attenuation studies in that measurements are made in air instead of water. To evaluate the method, an initial set of measurements was made to determine the acoustic properties of water-kaolinite mixtures. Preliminary data analysis indicates that the frequency dependence of the acoustic properties of wet sediment samples can be measured over the range from 1 to 10 kHz by using an impedance tube in air, together with a series of different-length sample holders. The results are compared to measurements made with other techniques.
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