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Three Causes for IR Skepticism

In my nearly 30 years in this industry, I’ve seen lots of fads and gimmicks come and go.

All too often these fads seem to be the creations of over-zealous marketing departments who don’t have the practical scientific understanding to know how the technology is really used.

For example, the recent introduction of an imaging system (by […]

RESNET Thermography Guidelines

For the past several years, a dedicated group of thermographers has worked hard to develop and establish the new RESNET Guidelines for Thermographic Inspections of Buildings. I am thrilled to say it is now in place and ready to be applied! The entire RESNET Guidelines document can be viewed here.

The poorly installed blown-in […]

Locating Levels in Tanks

The liquid/air interface of an egg is usually obvious. Take a look and you’ll see!

Thermographers are often surprised by what we find and no wonder because we are looking at the world as it has never been seen by the average person! I can still remember the first time, poking around the kitchen with […]

Reflected Temperature Correction

I hope many of you practiced measuring radiometric temperatures this past week! Maybe some of you viewed hamburgers cooking on the grill during a Labor Day picnic? I trust, in particular, our many friends in organized labor had a good, long weekend—after all, you’ve so often been at the forefront of using thermography […]

Emissivity: Understanding How it Affects Your Thermal Images

I often joke that were it not for emissivity, you’d not need training to use an imager! In our courses we find emissivity is the #1 most confusing issue for people, whether they are engineers, home inspectors or new thermographers. In fact, we all usually have a good laugh that many cannot even pronounce the […]

Radiometric Measurements---How Thermographers Can Measure them Accurately

In life we often make corrections to our first impressions or first courses of action. Whether we are following directions while driving, stepping on the scale to check our weight or adding cream and sugar to our coffee, corrections are an important part of getting it right! Without them, we don’t get to where we […]

Dealing With That Big Heater in the Sky—the Sun!

Whether we work outside or inside, day or night, inspecting buildings or substations, we must learn to deal with the Sun because it is very powerful.

The sun radiates both long and mid-way infrared electromagnetic energy, but it also radiates considerably more energy in other parts of the spectrum—ultraviolet, short-wave IR, visual, and radio—that, when absorbed, […]

Convection

Last week we discussed conductive heat transfer in solids. That is, how we feel warmth from a mug of coffee. But why is the handle on the mug so much cooler? One reason, of course, is the greater conductive pathway—or the distance to the heat source—but a more significant reason is probably convection. Heat transfers […]

Conduction: A Solid Way to Transfer Heat

Thermographers must have a solid understanding of how heat is transferred. We don’t necessarily need to take a college level course, but a practical understanding and being well-grounded in physics is essential. Why? Because mostly we see surfaces of things, but the heat we are most often truly interested in is internal. An abnormally warm […]

Radiational Heat Transfer: Moving Heat Magically

My recent trip to the beach was a pleasant reminder of the “magic” of radiational heat transfer. How else can we describe warmth delivered from 94 million miles away? We feel similar radiant transfer when we BBQ, sit in front of a fire, or feel a hot brick wall on a cool evening. The truth […]