Sensors

Dewpoint Temperature & Humidity

Although this area began as an application of temperature sensors and later, other sensors, it grew out of temperature measurements. (that’s why this site, like major metrology institutes, include moisture sensors in their coverage of temperature sensors)

Remember the old style humidity indicators that consisted of two little glass thermometers, the wet and dry bulb thermometers (the wet bulb had a cotton “wick” that surrounded the bulb and it was immersed in a container of water) with a little look up table that told you the humidity, both absolute and relative?

Have a look, it’s a very important area in terms of human comfort, food safety and energy conservation and efficiency in thermal processes.

It goes far beyond that nowadays. Today, people measure more than the humidity in the air or in compressed gases. They also measure the moisture content of foods during processing, industrial materials, both solids and liquids and much more.

Quite often an object’s temperature-time history is a driving force for getting the product to an desired production condition, and, conversely, too low a moisture level in air can make us feel uncomfortable at “normal” temperatures.

Thermal Imaging

The special world of infrared thermal Imaging (thermography and thermal images) includes the temperature-measuring kind of thermal imagers called “Radiomatic”, by those in the business, and “Quantitative” by those mostly in R&D who use thermal imaging. It has some unique uses in other fields as well.

Some call it “Thermology” when it applies to measurements made on the human body and “Medical Thermography” by still others, some even in the same business.

Users of infrared thermal imaging have many options in cameras both with and without temperature scales or temperature indication.

It seems really odd to have all these different names kicking about, when they all refer to the same basic technology. The names seem to differ only by application area.

In reality, nearly all noncontact temperature devices and thermal imagers work because of the same Law of Physics, called Planck’s Law.

The Applications page can lead you to many well-known solutions or examples, possibly similar to the one you are trying to solve.

But there are many more helpful hints and examples of successful measurements out there.

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