Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1991-12-09
1992-07-21
Hellner, Mark
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
73861, G01P 336
Patent
active
051317419
ABSTRACT:
A refractive velocimeter apparatus for measuring fluid velocity in a stack includes an optical instrument positioned on the stack for generating an optical signal, which instrument includes a lens for collimating light and positioned for detecting the collimated light along a first direction through the stack and through the fluid flowing within the stack, and a first reflector positioned for reflecting at least some of the collimated light along a second direction, parallel and opposite to the first direction, through the stack and through the fluid flowing through the stack. A second reflector is positioned for reflecting collimated light away from the second path and out of the instrument as the optical signal. A laser is positioned remotely of the stack and light from the laser is provided to the optical instrument through a fiber optic cable. The optical signal from the optical instrument is transmitted through another fiber optic cable to a signal evaluation unit positioned remotely of the stack and which is adapted for evaluating a frequency of the optical signal for determining the velocity of the fluid flowing in the stack.
REFERENCES:
patent: 3552855 (1971-01-01), Crosswy et al.
patent: 3953126 (1976-04-01), Kim et al.
patent: 4201467 (1980-05-01), Hartmann et al.
patent: 4766323 (1988-08-01), Franklin et al.
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