Global Perspective, Local Commitment

What is Infrared? It is the energy that is emitted from all objects.

Electromagnetic Spectrum VISIBLE UV Infrared X-rays Gamma Rays Radio EHF SHF UHF VHF HF MF LF VLF 0.1A 1A 100A 1µ 100µ 1cm 1mm 1m 1km 100km Wavelength 30 20 15 10 8 6 4 3 2 1.5 1 0.8 0.6 0.4 Wavelength µm Infrared Measurement Region TV mm WAVE 1000 C WHAT PLANCK’S RADIATION LAW MEANS: EXPLAINS WHY CAN “FEEL” HEAT FROM WARM OBJECT - MOST THERMAL ENERGY IS IN IR SHOWS WHY INFRARED (IR) IS PROPER SPECTRAL BAND TO MEASURE TEMPERATURE ALLOWS ANALYSIS OF MEASURED HEAT SIGNAL

The Object Important Parameters Temperature range Size and shape Distance from sensor Material type Movement 453¡C SP1 470¡C EMS ¯.85 S T The object is the initial part of the IR system and any discussion of infrared theory and analysis must start with an understanding of the characteristics of the object being measured. All objects above absolute zero will radiate electromagnetic energy in the infrared spectrum. Understanding the object’s parameters is important in designing an appropriate IR system. For temperature range, do you just need to measure the process, or start-up temperatures as well. Are you measuring discrete, separate objects, or a continuous whole? The speed of any moving objects most fall within an instrument’s response time. Object

Sources of Infrared Energy Reflectivity, Transmissivity, Emissivity Object Ambient R Sensor T Infrared energy incident upon an object will either be reflected off the object, transmitted through the object or absorbed and emitted. Shiny metals reflect energy off an object. Glass and plastic will transmit energy through an object. Energy that is absorbed by an object will heat it. This energy is then emitted at the object’s surface and can be measured by an infrared thermometer. IR temperature measurement tries to isolate the emitted energy in order to obtain an accurate reading. E R + T + E = 1 (Total collected Energy) R = Reflected Energy T = Transmitted Energy E = Emitted Energy from Object SIGNAL COMPOSED OF E + R + T. E IS DESIRED COMPONENT REFLECTED MAKES READING TOO HIGH TRANSMITTED MAKES READING TOO HIGH

Emissivity-the Ability of an Object to Emit Energy Measuring errors are often caused by IR energy being reflected