Measuring and testing – Vibration – By mechanical waves
Patent
1996-12-30
1998-12-01
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73626, 73628, 600444, 600447, 364723, G01N 2906, G01S 752, G03B 4206
Patent
active
058441395
ABSTRACT:
A phased array sector scanning ultrasonic system includes a separate receive channel for each respective element in an ultrasonic transducer array. Each receive channel imparts a delay to the echo signal produced by each respective element. The delayed echo signals are summed to form a steered, dynamically focused and dynamically windowed receive beam even when the transmit beam does not emanate from the center of the array. The receiver has a beamformer including a multiplicity of beamformer channels. The beamformer dynamically increases delays to each channel without introducing unwanted discontinuities, by combining and synchronizing a FIFO and an interpolator. The interpolator uses "Wallace tree" adders to accumulate bit-shifted versions of the inputs. The number of additions is less than the number of bits which would be needed to represent equivalent coefficients. This reduces the hardware relative to a conventional implementation which incorporates multipliers with shifts and adds equaling the number of bits in the coefficients.
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Lillegard Gregory A.
Miller Steven C.
Milon Daniel
Flaherty Dennis M.
General Electric Company
Miller Rose M.
Pilarski John H.
Williams Hezron E.
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