Software offers FFT filtering capabilities.

Press Release Summary:



Virtual Sample Mode allows user to view single-frequency images of internal defects or other features. Fast Fourier Transform filtering utilizes multiple-frequency echoes of acoustic micro imaging. Transducer pulses range of frequencies around 230 MHz into sample. Reflection from interface alters frequency distribution, but return echo encompasses similar range of frequencies. Individual-frequency FFT-filtered images can be viewed serially, or displayed simultaneously.



Original Press Release:


Improved Analysis From Single-Frequency FFT Imaging


Elk Grove Village IL -- Engineers using Sonoscan's new Virtual Sample Mode are gaining an unprecedented view of internal features from the software's FFT-filtering capabilities. Numerous single-frequency images of an internal defect or other feature can be viewed rapidly.

FFT (Fast Fourier Transform) filtering takes advantage of the multiple-frequency echoes of acoustic micro imaging. A 230 MHz transducer actually pulses into the sample a range of frequencies around 230 MHz. Reflection from an interface alters frequency distribution, but the return echo encompasses a similar range of frequencies.

The result is 20 to 30 or more single-frequency images (192, 194, 195 MHz, etc.) each giving a slightly different view of the internal defect or feature. Single-frequency images give more crisp definition of fine details and more accurate analysis. They can point up features that are hard to distinguish by other means.

The individual-frequency FFT-filtered images can be viewed serially, or can be displayed simultaneously. Frequencies can also differ by less than 1 MHz - for example, 37.1, 37.2,
37.3 MHz, etc.

For more information, contact Steven R. Martell, technical marketing manager, Sonoscan, Inc., 2149 E. Pratt Blvd., Elk Grove Village IL USA 60007. E-mail: info@sonoscan.com. Phone: 847 437-6400 x 240. Fax: 847 437-1550.

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