Chimney stack thermography

June 13, 2016By Bob BerryGeneral

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

Working with low emissivity busbars

June 6, 2016By Bob BerryGeneral

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

A6703sc images

May 30, 2016By Bob BerryGeneral

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.

Why do some things glow when they are hot?

May 25, 2016By Bob BerryGeneral

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

Will a silvered mirror have a high or low emissivity?

May 15, 2016By Bob BerryGeneral

This is an excellent question. A silvered mirror is a piece of glass, coated on one side with a very reflective metal. The silvered side with have an extremely low emissivity, but the other side is essentially glass, so its emissivity will be the emissivity for the glass, which should be high. Sometimes people use … Read More

What is temperature?

May 13, 2016By Bob BerryGeneral

  An excellent question, the concept of temperature relates to the average speed of molecular movement. It is a relative measurement, letting us know simply that one object is hotter (or colder) than another object. The principle of temperature measurement is essentially linked to the so-called “Zeroth Law of Thermodynamics”. This curiously named law is … Read More

CUI Classification with thermography

May 11, 2016By Bob BerryGeneral

What priority classification should be used for CUI (corrosion under insulation) thermography inspections? CUI is more difficult to classify than electrical thermography. There are many criteria that affect the likelihood of corrosion, including condition of insulation, operating temperature, and surface protection. To classify the risk based on temperature is normally done as follows*; High between … Read More