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I captured this photograph last week at sunrise showing that winter has come to the small town of Montpelier, Vermont where I live. The golden dome of our statehouse can be seen in the lower right against a backdrop of the Green Mountains. Here in Vermont, as well as in much of the rest of [...] The Thanksgiving feast was delicious and the leftovers were too. I’m certain my calorie intake over the past week is quite out of balance with my use of energy. A wooden kitchen match, burned entirely, gives off approximately on British Thermal Unit (Btu) of energy. One Calorie is the energy equivalent of burning four kitchen [...] We left our friend, Mr. Turkey, warm and happy in last week’s blog post. Last week we left our wildlife friend, Mr. Turkey, exposed and thermally obvious. You can imagine what happened between then and this week. So let’s talk again talk about capacitance , the thermal concept so fundamental to much of our work. Whether [...] Long ago, I once taught a course in a hotel that also housed a “disco”, which if you remember what they were, gives you an idea of how long ago it was! One evening after class, a student talked the DJ into plugging the video cable into the infrared imager we were using and suddenly [...] Reflections, no matter what part of the electromagnetic spectrum we are operating in, are part of life. All materials are partially reflective of some wave lengths and none are perfectly reflective. We are all familiar with mirrors, but watch a baby or a puppy when they are first looking into a mirror and learning how to [...] Check out this diagram for a festive explanation of the stack-effect!
Hope you all had a happy Halloween! Not unexpectedly a few goblins showed up this week in my neighborhood. Fun to see whether in the visible or the infrared part of the spectrum. 1. A pair of Jack-o-Lanterns can have fun even in the infrared spectrum. Mr. Jack-o-Lantern is not unlike many of the electrical problems thermographers see. Fairly cool on the exterior, but [...] As I’ve written about over the past two weeks, there are a number of factors that determine what the temperature of a surface will be beside the energy inherent to it. We need to understand them so that we can make a valid analysis of what is really going on. As an example, imagine an abnormally [...] Last week we focused on the affect radiational cooling and heating has on surface temperature. If you still have any doubts about this, just go outside in the sun and again on a clear night and observe the great variation of temperatures you find on your thermal images. Many of them are related to radiation. When [...] “Ground fog” is common in many areas in the fall as cold air settles in the valleys and the moisture in it condenses. The changes in color of the fall foliage are also closely related to temperature change and the physiology of the trees. Fall has continued to come on quickly. While we’ve enjoyed a [...] |
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