Browse Prior Art Database

MULTIPURPOSE FLUID SENSING/FLOW DETECTION APPARATUS

IP.com Disclosure Number: IPCOM000027076D
Original Publication Date: 1995-Feb-28
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 161K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is an apparatus for sensing flow and/or other characteristics of a fluid, including an emitter adapted to project a light beam, a detector adapted to transmit a signal in response to receiving the light beam and a rotatable member for transmitting the beam of light from the emitter to the detector through a quantity of the fluid. Optic fiberdlight pipes may be used to transmit light to the emitter from a light source, through the rotatable member and to a processor remote from the detector. The rotatable member may also include reflective and nonreflective zones for transmitting light passing through the fluid to the detector. A plurality of light pipes, blades, emitters and detectors may be used on the rotating member depending on a particular application.

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XEROX DISCLOSURE JOURNAL

MULTIPURPOSE FLUID SENSING/FLOW DETECTION APPARATUS
Thomas A.
Henderson

Proposed Classification

U.S. C1.356/436 Int. C1. GOln 21/00

12

10 16 \

20

XEROX DISCLOSURE JOURNAL - Vol. 20, No. 1 January/February 1995 103

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MULTIPURPOSE FLUID SENSING/FLOW DETECTION APPARATUS (Cont'd)

Disclosed is an apparatus for sensing flow and/or other characteristics of a fluid, including an emitter adapted to project a light beam, a detector adapted to transmit a signal in response to receiving the light beam and a rotatable member for transmitting the beam of light from the emitter to the detector through a quantity of the fluid. Optic fiberdlight pipes may be used to transmit light to the emitter from a light source, through the rotatable member and to a processor remote from the detector. The rotatable member may also include reflective and nonreflective zones for transmitting light passing through the fluid to the detector. A plurality of light pipes, blades, emitters and detectors may be used on the rotating member depending on a particular application.

The Figure shows a cross sectional view of combined flow rate and fluid density sensor 1. Support member 4 is shown connected to flow tube 3 at two positions. A rotatably mounted member, prop 6, is mounted on axle 8. Axle 8 is rotatably attached to support 4, such that prop 6 turns freely according to fluid flow through tube 2. Light pipes 10 and 12 are formed within interior areas of prop 6, and pass through the blades or fins of prop 6 as shown. Emitter 14 emits light such that when light pipe 10 or 12 aligns with emitter 14 and detector 16, light is transmitted through the fluid across the gap between the light pipe ends. Alternatingly, light thereafter passes through each light pipe 10 or 12 and across the gaps at the ends of each light pipe and into detector 16. Light pipe 12 is shown in the Figure as being slightly shorter than light pipe 10, such that when light pipe 12 is aligned with emitter 14 and detector 16, the light beam must pass through a greater fluid gap or distance than when light pipe 10 is aligned with emitter 12 and detector 16. In certain applications, it may be desirable to maintain uniform or laminar flow through tube 3. In other applications, fluid mixing according to movement of prop 6 may be desired.

As the fluid moves through flow tube 3, pressure on the blades of prop 6 causes prop 6 to rotate. As prop 6...