Scanning system having a deflectable probe tip
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United States of America Patent
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-
Mar 11, 2003
Grant Date -
Aug 23, 2001
app pub date -
Jan 26, 2001
filing date -
Jan 28, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention is directed to a scanning system having one or several deflectable probe tips which are excited to oscillation at or near their resonant frequency. A saturation amplifier (16) is provided for detecting and measuring the phase shift between the excitation signal and the oscillation carried out by the probe tip. The saturation amplifier (16) generates a rectangular signal from the incoming sinusoidally-shaped signal (3e) while exactly maintaining the time-dependent position of the zero crossovers of the signal. The detection system, which is required for each probe tip, thereby acquires a very simple configuration of few commercially available components. Saturation amplified rectangular signals exclusively form the basis for the further evaluation. For this reason, a substantial independence of the signal intensity of the oscillation signal is ensured.
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