Omega Engineering OMEGASCOPE OS524 User Manual download pdf (Page 64)

A-1

Appendix: How Infrared Thermometry Works

Thermal Radiation

Heat is transferred from all objects via radiation in the form of

electromagnetic waves or by conduction or convection. All objects

having a temperature greater than absolute zero (-459°F, -273°C,

0 K) radiate energy. The thermal energy radiated by an object

increases as the object gets hotter. Measurement of this thermal

energy allows an infrared thermometer to calculate the object’s

temperature if the emissivity (blackness) is known. Generally, it is

convenient to measure the amount of radiated energy in the

infrared part of an object’s radiation spectrum.

Figure A-1 shows a block diagram of an infrared radiation

thermometer. Energy from the object is focused by the lens onto the

detector. As the detector heats up, it sends out an electrical signal,

which in turn is amplified and sent to the circuitry of the

thermometer. The thermometer software then calculates the

temperature of the object.

Figure A-1. Infrared Thermometer Block Diagram

OBJECT

LENS

DETECTOR

SIGNAL OUTPUT TO SERIAL PRINTER

OR PERSONAL COMPUTER

AMPLIFIER

THERMOMETER

CIRCUITRY AND

DISPLAY

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Omega Engineering OMEGASCOPE OS524 User Manual Page 64