Patent ID: 6608668
Filing Date: 2003-08-19
Classification: A61B,G01P,G01S

Abstract:
An apparatus comprising:a housing, having a maximum outer dimension extending from one end to the other, of 3 mm or less; and at least an optical transmitter part, and an optical receiver part, and elements which alter the path of light between said optical transmitter part and said optical receiver part, coupled to said housing, and carrying out laser Doppler velocimetry within said housing, wherein said optical transmitter part and said optical receiver par are each formed from lengths of optical fibers, wherein said optical elements include a single lens coupled to both said optical transmitter part and said optical receiver part, wherein said lens has at least one diffractive optical element formed thereon, and wherein said lens has a first flat surface and a second curved surface, and wherein said diffractive optical element is formed on said flat surface.