Patent ID: 7719663

Claim:
A heterodyne laser Doppler probe, comprising: (a) a first optical path for guiding excitation light; (b) a second optical path for guiding measurement light; (c) an optical probe body for optically coupling and structurally combining the first optical path and the second optical path, and including a reflection mirror, a beam splitter, a focal lens and a ¼ wavelength plate, wherein the excitation light from the first optical path is introduced through the reflection mirror, the beam splitter and the focal lens into a measurement object, and wherein the measurement light from the second optical path passes through the ¼ wavelength plate to be converted from linearly polarized light into circularly polarized light, then introduced through the beam splitter and the focal lens into the measurement object, reflected off the measurement object through the focal lens and the beam splitter into the ¼ wavelength plate to be converted from circularly polarized light into linearly polarized light, and then returned through the second optical path to a heterodyne laser Doppler measurement device.