Examined body interior information observing apparatus by using photo-pulses controlling gains for depths
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United States of America Patent
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Apr 26, 1994
Grant Date -
N/A
app pub date -
May 14, 1991
filing date -
Sep 26, 1990
priority date (Note) -
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Abstract
A photo-pulse from a photo-pulse generating apparatus is branched, where one branch is radiated to an examined body and the reflected light reflected within the examined body is delayed in time in proportion to the depth from the surface of the examined body and is led to a time-analyzing reflected light measuring apparatus. In this measuring apparatus, the other branched reference photo-pulse or reference signal pulse is input as delayed by the time for which the photo-pulse reflected within the examined body returns and only the reflected light component synchronized with the entering timing of this reference light pulse is analyzed in the time and is detected. By varying the detection sensitivity of this measuring apparatus in response to the depth from the surface of the examined body, the interior can be observed.
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