Pseudo continuous wave instrument

Details Pseudo continuous wave instrument Pseudo continuous wave instrument

1977-12-08

1978-10-03

Myracle, Jerry W.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73589, G01N 2900

Patent

active

041177312

ABSTRACT:
A device for measuring acoustic properties and their changes in a sample of liquid, gas, plasma or solid. A variable frequency source is applied to the sample by means of a transducer to produce sound waves within the sample. The application of the variable frequency source to the sample is periodically interrupted for a short duration. Means are connected to the transducer for receiving the resulting acoustic signals during the interruptions for producing a control signal indicative of a difference in the frequency of the output of the variable frequency source and the frequency of a mechanical resonant peak in the sample. The control signal is applied to the variable frequency source to maintain its output frequency at the frequency of the mechanical resonant peak. The change in frequency of the variable frequency source is indicative of the shift in frequency of the mechanical resonant peak and the amplitude of the acoustic signals is indicative of the attenuation of the acoustic signals in the sample.

REFERENCES:
patent: 3345862 (1967-10-01), Rowe
patent: 4014208 (1977-03-01), Moore et al.

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