Email question received; I have some chimney stacks to inspect with thermography. Both stations are thermal coal. One station has two stacks that were built-in 1976-1980. The two stacks are 177 metres high. The other station has one stack and was built-in 1992/93 and is 250 metres high. I have been asked to identify areas of … Read More
Recently I have come across quite a few people that work with low emissivity materials like copper busbar. Generally they are under the impression that so long as they keep away exact temperature measurement then they will be ok. They just stick to looking for thermal gradients. In fact, materials like copper busbar have such a low emissivity … Read More
There are a couple of images below taken with an A6703sc, both images are of a £2 coin, one with a 50mm lens, the other with a 1X microscope lens.
This is an excellent question. Of course it does depend on how far away the object is from the camera. Camera specifications usually give a figure for FOV and IFOV, but seldom quote the MFOV. FOV (Field of View), this refers to everything that the camera can see, as it will depend on the distance to … Read More
Objects begin to glow when they become incandescent. Incandescence is a name given when objects begin emitting thermal energy in the visible part of the electromagnetic spectrum. This usually starts at about 500-525 degrees C. As an object heats up two things happen. Firstly they emit more radiated energy. Secondly, the peak wavelength of the … Read More
I have come across much discussion online about Delta T and their importance. Some people consider low Delta’s to be irrelevant. I even came across the following statement “some people call for a repair with temperature differences of 5 Deg C. I say no need”. From a personal point of view I consider it unprofessional … Read More
Can you carry out thermography surveys of buildings when it is raining? I have often been asked this. If it rains, the external surfaces can be wet/damp. This causes evaporative cooling over the damp surface and this cooling can mask problems. For this reason it is best not to conduct surveys in the rain. Reports … Read More
Question “How often does thermography have to be done on our electrical system?” Answer; Firstly, In most countries thermography is not a legal requirement, however there are other reasons that it should be done. Some insurance companies require thermography to be done as part of their insurance requirements. They do this to mitigate losses. Their … Read More