Monday, August 14, 2006

Skin-Sensing Table Saw

This is too cool! A skin-(or sausage)-sensing table saw....

The link has a demonstration video. From the article:

'To sense the touch of flesh, the unit employs a signal generator to induce a 500-KHz electrical sine wave current on the saw blade. When a woodworker touches the blade, that finger “becomes part of the blade,” Gass says. An electrode adjacent to the blade serves as a sensor and sends that signal back to electronic circuitry via a wire. In the circuitry, a Texas Instruments Digital Signal Processor (DSP) with an analog-to-digital converter then digitizes the analog signal. Every 6 µsec, the DSP samples the voltage at the blade, “looking” for a characteristic drop that would indicate a human body has drawn some current off the blade.'


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