In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 66, No. S1 ( 1979-11-01), p. S2-S2
Abstract:
A velocimeter was designed for longitudinal sound-speed measurements on 3-mm-thick (ASTM) rubber samples. Batch-to-batch variations in sound speed are detected to 0.1% precision by operators without technical experience. Each measurement required five minutes with the prototype device, and substantial reductions are expected with minor design modifications. The device consists of two ultrasonic transducers with a rubber sample sandwiched between them. During device assembly, the sample is squeezed by the transducers such that a known and reproducible transducer-transducer separation distance is obtained. A 5-MHz cw signal is then applied to one transducer. The phase angle difference of the signal received by the other transducer is read on a meter face, and is related to the wave speed in the rubber. By performing a detailed theoretical analysis of this geometry, we are able to meaningfully compensate the value of the meter reading for variations in temperature, thickness (related to the degree of sample squeezing used), and sound absorption, and also use the device for absolute sound speed and attenuation measurements.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
1979
detail.hit.zdb_id:
1461063-2
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