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Abstract

An optical flow meter comprising a source of light, an optical fiber, a connector, a detector, and output electronics. The optical fiber is connected to the source of light so as to transmit light therethrough. The connector is arranged for attaching the optical fiber in a position generally adjacent to a rotating body. The detector is a photodetector that is arranged to receive light from the optical fiber after the light is reflected by the rotating body. The source of light is a light-emitting diode. The optical fiber is a single optical path. A lens is disposed generally about one end of the optical fiber for directing and focusing light relative to the rotating body. The end of the optical fiber is sealed so as to isolate the end of the fiber from the environment of the rotating body. A beamsplitter is included as an optical coupler between the light-emitting diode, the optical fiber, and the photodetector.

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First Claim