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Optical flow meter for measuring gases and liquids in pipelines

A pipeline, optical technology, applied in the measurement of flow/mass flow, measurement device, fluid velocity measurement, etc., can solve problems such as being unsuitable for field applications, limitations, etc.

Active Publication Date: 2006-10-11
PHOTON CONTROL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specialized laser devices for measuring particle size are known, but their use is largely limited to controlled laboratory environments due to their sensitivity to vibration and misalignment, and they are not considered suitable for field applications

Method used

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  • Optical flow meter for measuring gases and liquids in pipelines
  • Optical flow meter for measuring gases and liquids in pipelines
  • Optical flow meter for measuring gases and liquids in pipelines

Examples

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Embodiment Construction

[0038] image 3 An optical flow meter constructed in accordance with a preferred embodiment for determining the flow rate of a fluid in a pipe by measuring the velocity of small particles carried by the fluid flow is shown in . The flowmeter device consists of the following components: an optomechanical head 10 inserted between adjacent flanges 11 in a pipe 12, an electro-optical assembly 13 containing two laser sources 14, two scattered signal photodetectors 54 and 55, Processing electronics 15 , and an optical extension cable guide 16 connecting the optoelectronic assembly 13 to the optomechanical head 10 . In this configuration, the optoelectronic assembly 13 can be remotely located so that no electrical potential exists at the optomechanical head 10, which is desirable when fluid passing through the pipeline, such as natural gas, could be ignited by a spark or short circuit. Furthermore, the fiber optic terminations at the optomechanical head 10 are compact, robust and di...

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Abstract

An optical system design for measuring the velocity of fluids flowing through pipes or other conduits is disclosed. The optical system is comprised of a means for delivering two beams through a window in the wall of the pipe, focused to two points aligned along an axis of the pipe and separated by a known distance, and means for detecting light that is scattered by particles carried in the fluid stream through a second window, that is disposed on the opposite side of the pipe. By measuring the time delay between detected signals, the velocity of the fluid can be determined. The delivered light beams are focused in a shallow cone of light and are blocked by an obstruction disposed behind the second window. The scattered light passes through an aperture behind the second window that surrounds the obscuration, and is focused on to a detector surface.

Description

Background technique [0001] The present invention relates generally to measuring equipment for measuring the velocity of fluid flowing in pipelines, and is generally useful for determining flow rates in industrial applications such as natural gas transportation. More specifically, the invention relates to an optical system that focuses two light beams in a tube through a transparent window in the tube wall and detects when small particles carried by the fluid pass from one focal point to another , the flight delay of light scattered by these particles. [0002] In pipeline operations and other industrial processes, flow meters are used to measure the flow rate of gas or liquid through pipelines. There are many mechanical methods for determining flow rate in pipes, including orifice plates, pitot tubes, venturi meters, vortex meters, Coriolis effect meters, variable area meters, and turbine meters , but they generally require the insertion of a barrier structure within the pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/26G01F1/66G01P5/20
CPCG01F1/662G01N2015/0294G01F1/661G01N15/0205G01P5/20
Inventor 德里克·蒙哥马利达尔·詹姆斯严跃
Owner PHOTON CONTROL INC
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