Fujifilm Sonosite, Inc.

Visualsonics Inc.

Applied Microsystems Corporation

Sunnybrook Health Science Centre

Laurence C Brasfield

Desmond Hirson

Ronald Elvin Daigle

Lauren S Pflugrath

James Mehi

F Stuart Foster

Kai Wen Liu

Brian Starkoski

Jerrold Wen

Stuart F Foster

A system for acquiring an ultrasound signal comprises a signal processing unit adapted for acquiring a received ultrasound signal from an ultrasound transducer having a plurality of elements. The system is adapted to receive ultrasound signals having a frequency of at least 20 megahertz (MHz) with a transducer having a field of view of at least 5.0 millimeters (mm) at a frame rate of at least 20 frames per second (fps). The signal processing can further produce an ultrasound image from the acquired ultrasound signal. The transducer can be a linear array transducer, a phased array transducer, a two-dimensional (2-D) array transducer, or a curved array transducer.

High frequency array ultrasound system

A first process is used to identify the second circuit to which the shorted circuit is connected. A low-level, A.C. potential is imposed between the node known to be shorted and a common trace. A high impedance probe is scanned over the circuits at a distance. The potential detected is filtered and compared with the impressed potential. The result is filtered, amplified, and synchronously demodulated and the result displayed. The second process is used to locate the site of the short. A low-level AC current is injected between two shorted traces. Points along the traces are contacted by a high impedance probe. The signal is filtered and compared with the impressed potential. The result of the comparison is further filtered, amplified, synchronously demodulated and the result displayed. A shorts locator is under the control of a central processing unit. Clips permit connection to the system under test. The clip potentials are monitored. A high impedence probe circuit which includes filtering and buffering circuitry, provides an output signal which compared to probe circuitry potentials. An excitation circuit provides and AC test signal applied by means of the clips. The probe and clip circuitry potentials are passed through a narrow bandpass amplifier. The resulting signal is demodulated by an intergrator which has synchronously reversed polarity. The output is passed through an analog to digital converter and passed to the central processor for processing and display.

Method and apparatus for locating short circuits

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Mercer Island, WA, United States of America

Laurence C Brasfield