Measuring and testing – Vibration – By mechanical waves
Reexamination Certificate
2005-05-31
2005-05-31
Williams, Hezron (Department: 2856)
Measuring and testing
Vibration
By mechanical waves
C073S624000, C073S644000, C073S865500
Reexamination Certificate
active
06898978
ABSTRACT:
An apparatus for making pulsed acoustic measurements to determine particle size in a sample (1) such as a colloid. The apparatus includes two electrodes (2) between which an electric voltage is applied to the sample. The voltage is applied in short pulses. The applied voltage generates an acoustic signal, such as a sound wave (5), in the sample which is detected with a transducer (3) after the wave (5) has passed through a delay element (4). The delay element (4) is used to introduce enough of a time delay between the application of the voltage pulse and sound wave (5) reaching the transducer so that the received wave's signal can be isolated from any signal generated in the transducer (3) by the applied voltage. The delay element (4) and the transducer (3) are arranged into a geometry, or, alternatively, the delay element (4) is shaped, so that any reflections of the sound wave (5) from the sidewalls of the delay element (4) are deflected away from the transducer (3). This reduces interference, particularly at low frequencies.
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Cannon David W.
O'Brien Richard
Colloidal Dynamics Pty Ltd.
Kinney & Lange , P.A.
Saint-Surin Jacques M.
Williams Hezron
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