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Getting Connected to Good Support

The work we do as thermographers has immense value; I don’t mean to imply that the world would stop turning without us, but thermographers do a great deal to have it turn more smoothly and efficiently! The disastrous situation in Japan reminds us of how vulnerable the complex systems and machines we have grown to […]

That Old North Wind

Last week we talked about dressing for winter weather, in a ‘how-to’ post on reducing heat loss from our bodies. We’ve all experienced how difficult it is to stay warm when that “Old North Wind” is blowing cold. Wind—or forced convective heat transfer as it can also be termed—seems to “go right through” even the […]

Getting Ready for “Winter” Building Energy Inspections

John Snell in Winter Mode

As winter makes itself known—undeniably so here in Vermont, with hard frosts, flurries of “hard water” and a couple feet of snow in the mountains—it is useful to review the procedures and techniques for using our imagers to find problems, especially those in buildings.

Industry standards, including the new RESNET Guideline, […]

Correcting Measurements Through Infrared Windows

Over the past several weeks, we’ve seen how essential it is to make corrections to the raw data our imaging systems detect. Without these adjustments to emissivity and reflected background temperature, we can never achieve the ±2ºC accuracy that our systems are capable of achieving in ideal circumstances.

One additional correction—for the partial transmission of radiation […]

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 […]

A Case Study: Heat Transfer In Action

Over the past several weeks we’ve talked about how heat “moves,” or what is called heat transfer (steady state and transient) and the modes of transfer (conduction, convection and radiation). While it is important to have a solid understanding of the theoretical basics, how does all this really apply to what we do every day […]

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 […]

Conducting Inspection of Utility Substations

As we approach the summer “peak” of electrical usage in North America and other parts of world, many of us realize how vulnerable the grid has become. Much of it is old, poorly maintained, and loaded beyond design. While I hope we won’t see a huge cascading blackout, we can expect to see outages this […]

The Value Proposition for Infrared Roof Moisture Inspections

As I ended last week’s blog post, I emphasized that an investment in a roof moisture inspection can pay huge dividends. A roof system is typically one of the most expensive parts of a commercial building and—too often as the photograph shows—it is “out of sight and out of mind!” The costs are exorbitant—including the […]