The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 31, 2005
Filed:
Feb. 26, 2002
Richard O'brien, Turramurra, AU;
David W. Cannon, Attleboro Falls, MA (US);
Richard O'Brien, Turramurra, AU;
David W. Cannon, Attleboro Falls, MA (US);
Colloidal Dynamics Pty Ltd., Eveleigh, AU;
Abstract
An apparatus for making pulsed acoustic measurements to determine particle size in a sample () such as a colloid. The apparatus includes two electrodes () 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 (), in the sample which is detected with a transducer () after the wave () has passed through a delay element (). The delay element () is used to introduce enough of a time delay between the application of the voltage pulse and sound wave () reaching the transducer so that the received wave's signal can be isolated from any signal generated in the transducer () by the applied voltage. The delay element () and the transducer () are arranged into a geometry, or, alternatively, the delay element () is shaped, so that any reflections of the sound wave () from the sidewalls of the delay element () are deflected away from the transducer (). This reduces interference, particularly at low frequencies.