Velocimeter, Doppler, Flow
Wednesday, September 20, 2006
A Flow Doppler Velocimeter has been designed and developed using the Doppler principle for non-intrusive flow measurement of an incompressible fluid in a narrow tube.
The Velocimeter consists of a three-section optical head and a separate electronics module. Laser Diode wavelength (780 nm) stability is temperature control by a thermoelectric cooler. An optical flat splits the output light beam from the Laser Diode into two light beams, which are focused by a lens.
The middle section of the Velocimeter contains a flow tube, which has a quartz window for access to the flowing medium. The focused light beams intersect at the desired measuring position in the flowing medium.
The rear section contains the receiver system. This receiver contains a photodetector, a controllable iris aperture and a preamplifier.
Source: None Available
Reference: Gregory Getzer, Ophir Corporation, for the Marshall Space Flight Center, Alabama
posted by JD52 @ 8:55 PM,