Micro-doppler microscope
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United States of America Patent
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Jul 29, 2003
Grant Date -
May 15, 2003
app pub date -
Nov 9, 2001
filing date -
Nov 9, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A micro-doppler microscope for providing an indication of the vibration of a target. An input laser beam is received by a beamsplitter that divides the input laser beam into a transmitted portion and a reflected portion. A first focusing optics focuses the transmitted portion onto a target, the target scattering a scattered portion thereof. This scattered portion is directed back through the first focusing optics, and reflected off the beamsplitter. Second focusing optics is positioned to receive the scattered portion from the beamsplitter and for focusing the scattered portion. A planar mirror is positioned to reflect the reflected portion of the input laser beam back through the beamsplitter and through the second focusing optics so that it is focused. A fast photodetector receives the focused scattered portion from the second focusing optics and the focused reflected portion from the second focusing optics. Both focused portions are focused on the same spot on the fast photodetector. Coherent mixing of the focused portions occurs at the fast photodetector, the frequency modulation of the scattered portion thereby providing an indication of the vibration of the target. The indication is provided as an output signal from the fast photodetector.
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