Factors affecting emissivity

October 15, 2017By Bob BerryGeneral

What factors affect the emissivity of an object? Material Non-metals, usually have a high emissivity, and are usually fairly constant over time. Metals on the other hand can have a very low emissivity, and as they usually oxidise, their emissivity tends to vary drastically over time. Surface Polished and shiny surfaces tend to have lower … Read More

Why thermocouple readings don’t compare with camera results

October 8, 2017By Bob BerryGeneral

Why thermocouple readings don’t compare with camera results   Question received by email, slightly edited; We are busy working with a foundry that mainly does High chrome white irons. The problem that we are encountering is that there seems to be a variance of about 80°C between our thermal camera and the thermocouple that they … Read More

ITC User Conference

October 1, 2017By Bob BerryGeneral

Thanks to all for the positive feedback on my presentation at the ITC user conference held in Coventry on September 27th & 28th 2017. ITC did an amazing job at organising this years event, with attendance from over 30 countries. The event was a successful mix of presentations and practical workshops.

Reliability Ireland

October 1, 2017By Bob BerryGeneral

Thanks to all we met at Reliability Ireland 2017. It was good to catch up with so many in the industry, and to meet so many new people. A special thanks to the organisers (Tellabs) for organising such a great event, and to all those that attended our presentation.

Can infrared thermography measure gas temperatures?

April 10, 2017By Bob BerryGeneral

  All gases have different properties. Some gases certainly do emit infrared energy. However, they normally only emit in a very narrow spectral band. Thus seeing a gas is certainly possibly by using a camera adapted with a suitable spectral filter. Seeing the gases is not the same as measuring its temperature, and there are additional … Read More

Why does an infrared remote control not affect thermographic measurement, while the reflection of a person can?

April 3, 2017By Bob BerryGeneral

Why does an infrared remote control not affect thermographic measurements, while the reflection of a person can? This is a question of wavelength. Infrared remote controls operate in the near infrared range (e.g. 0.85 µm or 1.55 µm), while thermographic cameras usually work within MWIR (3-5) µm, or LWIR (8-14) µm. The remote controls simply do not emit … Read More

What is the cold temperature limit for infrared thermography?

March 20, 2017By Bob BerryGeneral

This depends on the capability of the thermographic camera used. Standard uncooled cameras fitted with a microbolometer detector allow non-contact temperature measurement as low as -40°C. Below this temperature, they are still emitting in the infrared region, however due to Planck’s  Law the infrared intensity emitted by objects is very low indeed. To measure below this limit … Read More

At what depth can thermography measure temperature?

March 13, 2017By Bob BerryGeneral

I get asked this from time to time. For most materials we cannot see below the surface at all, never mind measure a temperature below the surface. The vast majority of common materials are thermally opaque, this means that the camera can only detect radiation emitted from  the surface. For this reason we cannot normally … Read More

Where does infrared energy come from?

March 6, 2017By Bob BerryGeneral

This is a question that I get asked from time to time. All objects emit infra radiation, the hotter the object, the more infrared energy it emits. It is generated by rotation and vibration of atoms and molecules. The higher the temperature, the faster the movement of the atoms and molecules, and therefore the more infrared is … Read More

Flir T1K camera review

February 27, 2017By Bob BerryGeneral

T1K I have been asked a number of times for my opinion on the T1K, so I have decided to give my opinion. This will be honest, but extremely subjective. It would not be honest if I did not include “Likes” and “Dislikes”. I don’t normally do camera reviews, and it is not really my intention … Read More