Abstract
The effects of ultrasonic bonding materials between an acoustic transducer and a specimen surface on the velocity and attenuation of sound in red lauan wood were studied by using the ultrasonic pulse transmission method, since it was important to determine the acoustic coupling between the transducer and the specimen for measuring the sound velocity and attenuation in highly dissipative materials such as wood. Vaseline, grease, various kinds of machine oils, etc., were employed as an ultrasonic bonding material. The energy dissipation of sound was smallest in the case of grease. By combining the data of attenuation with that of the sound velocity, the effects of ultrasonic bonding materials on the ultrasonic behavior in red lauan wood are reported and discussed.
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