High-speed optical delay generating method by rotation reflector in optical coherence tomography and optical coherence tomography device
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United States of America Patent
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Jun 5, 2007
Grant Date -
Jun 17, 2004
app pub date -
Apr 11, 2002
filing date -
Apr 13, 2001
priority date (Note) -
Expired
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Abstract
A high-speed optical delay generating method by a rotation reflector in optical coherence tomography, capable of providing a sectional picture with a sufficiently long depth-direction (Z direction) scanning distance, and an optical coherence tomography device therefor are provided. The device comprises a low-coherence light source (1), a half mirror (2) for splitting light from the low-coherence light source (1) into two, that is, into object light towards an object (A) to be examined and reference light, a light delay mechanism (3) for delaying the reference light by means of a rotation reflector (12), a fixed mirror (4) for reflecting/returning the reference light from the light delay mechanism (3), the half-mirror (2) for combining the object light returning from the object (A) to be examined with the reference light returning from the light delay mechanism, and a light detector (11) for detecting interference light including a heterodyne interference beat signal combined at the half mirror (2).
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