Flowmeters

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G - Physics

01

F

73/137, 73/58

G01F 1/56 (2006.01)

Patent

CA 1166870

- 1 - Abstract A flowmeter in which a bladed rotor element is mounted in bore formed in a body so that the element rotates at a speed representative of the rate of flow of a fluid along the bore. Electromagnetic radiation is directed from a source into the bore and a radially outer face of each blade on the rotor element moves across the path of the radiation once during each rotation of the element. Radiation reflected by the outer faces of the blades is directed to a photosensitive detector. Direction of radiation towards the element and direction of reflected radiation towards the detector is effected by means which comprise at least one elongated guide member having a refractive index greater than the refractive index of the medium in which the member is disposed. The or each guide member is preferably formed integrally with the body in which the bore is formed.

390259

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