发明名称 |
SHORT COHERENCE LENGTH, DOPPLER VELOCIMETRY SYSTEM |
摘要 |
Apparatus for measuring the speed of blood in blood vessels in biological samples, for example, in retinal blood vessels, which apparatus includes: (a) a source of a beam of radiation having a principal wavelength, which radiation is substantially spatially coherent and has a temporal coherence length which is less than 1 picosecond; (b) a beam splitter for splitting the beam into a sample beam and reference beam; (c) optical apparatus for directing the sample beam to an area within the biological sample; (d) a reflector for reflecting the reference beam; (e) a detector for detecting an interference between the sample beam reflected from the area and the reflected reference beam and for generating an interference signal; (f) apparatus for altering an optical path length of the reference beam from the beam splitter to the detector at an alteration velocity; and (g) an analyzer for analyzing the interference signal to determine the speed of the blood in the area from a shift of a central frequency of a frequency spectrum of the interference signal from a frequency determined from the alteration velocity and the principal wavelength.
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申请公布号 |
CA2160838(A1) |
申请公布日期 |
1996.04.20 |
申请号 |
CA19952160838 |
申请日期 |
1995.10.18 |
申请人 |
CARL ZEISS INC. |
发明人 |
HELLMUTH, THOMAS;PETERSEN, CHRISTOPHER L. |
分类号 |
A61B5/0285;A61B3/12;(IPC1-7):A61B5/026;G01F5/00;G01S17/58;G01S17/88 |
主分类号 |
A61B5/0285 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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