Sight glasses or sight gauges are used in many industries to keep an eye on what is going on in the pipe during an industrial process. In many cases it is not possible to see through the fluid or not possible to put optically transparent pipe material in place.
Tomography can be used to visualise inside the pipe remotely – creating an electronic sight gauge. See the video for an example. The image shows a longitudinal cross-section of a pipe with oil and gas flowing. The video starts from low gas rates with large bubbles and moves through churn flow to annular flow with oil on the walls and gas in the core. The colours in the image represent concentration – blue is gas and red is oil.
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