Infrared Training Center

Monday, May 14, 2012

What does Sensitivity (NETD) mean when applied to a Thermal Imager?

Sensitivity expresses the ability of an infrared camera to display a very good image even if the thermal contrast in a scene is low. Put another way, a camera with good sensitivity can distinguish objects in a scene that have very little temperature difference between them.

Sensitivity is most often measured by a parameter called Noise Equivalent Temperature Difference or NETD, for example, NETD @ 30 C : 80mK. A Kelvin degree is the SI base unit of thermodynamic temperature equal in magnitude to a degree Celsius, so mK means thousandths of a degree (80mK = 0.080 K).

What is NETD?
NETD is defined as the amount of infrared radiation required to produce an output signal equal to the systems own noise. This is a noise rating of the system and should be as low as possible. We are not talking about how loud the system is here!!!Winking smile We are talking about electronic noise that we translate into a temperature difference at an object temperature of 30 C (86 F).

Wednesday, May 2, 2012

IR InformIR Blog Enhancements

I have added a few enhancements blog readers should appreciate.

imageA search box has been added so you can easily search the blog for the content you are looking for.


imageThe blog can now be easily translated into one of 54 different languages, everything from Afrikaans to Yiddish. Just use the drop down menu on the right and choose your language!


imageAn easy “follow by email” tool has been added which makes it easier than ever to get new blog content sent to your email box automatically and right away.