ISA Interchange

Welcome to the official blog of the International Society of Automation (ISA).

All Posts

Concentration Measurements of Bubbles in a Water Column Using an Optical Tomography System

This post is an excerpt from the journal ISA Transactions.  All ISA Transactions articles are free to ISA members, or can be purchased from Elsevier Press.


Arrangement of the projectors and optical fibres Arrangement of the projectors and optical fibres around the flow pipe - isometric view.


Abstract: Optical tomography provides a means for the determination of the spatial distribution of materials with different optical density in a volume by non-intrusive means. This paper presents results of concentration measurements of gas bubbles in a water column using an optical tomography system. A hydraulic flow rig is used to generate vertical air-water two-phase flows with controllable bubble flow rate. Two approaches are investigated. The first aims to obtain an average gas concentration at the measurement section, the second aims to obtain a gas distribution profile by using tomographic imaging. A hybrid back-projection algorithm is used to calculate concentration profiles from measured sensor values to provide a tomographic image of the measurement cross-section. The algorithm combines the characteristic of an optical sensor as a hard field sensor and the linear back projection algorithm.

Free Bonus: To read the full article on concentration measurements of bubbles in a water column, click here.

ISA membership entitles you to free access to all ISA Transactions articles plus a wealth of technical content, industry information, free webinars, training opportunities, program discounts, certification and licensure and professional networking.

Join ISA ... learn, advance, succeed!

2006 Elsevier Science Ltd. All rights reserved.

Related Posts

What Is Functional Safety?

Functional safety focuses on the detection of a potentially dangerous condition and depends on automatic ...
Jennifer Infantino Halsey Apr 7, 2020 5:15:00 AM

Companies Ramp Up Production of N95 Masks in Response to COVID-19

COVID-19 has exponentially increased the need for N95 disposable masks in hospitals and medical facilitie...
Kara Phelps Apr 3, 2020 5:15:00 AM

Newsweek Vantage Report on Cyber Risks to Critical Infrastructure: ISA's the Expert Partner

Newsweek Vantage recently published an independent report on cyber risks to critical infrastructure—and t...
Kara Phelps Mar 24, 2020 3:11:27 PM