Fluke Ti20 user manual Basics of Infrared Measurement, Why use non-contact infrared thermometers?

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Appendix B

Basics of Infrared Measurement

Q. Why use non-contact infrared thermometers?

Non-contact infrared (IR) thermometers use infrared technology to quickly and conveniently measure the surface temperature of objects. They provide fast temperature readings without physically touching the object. The temperature is shown on the LCD display.

Lightweight, compact, and easy-to-use, IR thermometers and thermal imagers can safely measure hot, hazardous, or hard-to-reach surfaces without contaminating or damaging the object. Also, infrared thermometers can provide several readings per second, as compared to contact methods where each measurement can take several minutes.

Q. How does IR work?

A. IR thermometers capture the invisible infrared energy naturally emitted from all objects. Infrared radiation is part of the electromagnetic spectrum, which includes radio waves, microwaves, visible light, ultraviolet, gamma, and X-rays.

Infrared falls between the visible light of the spectrum and radio waves. Infrared wavelengths are usually expressed in microns with the infrared spectrum extending from

0.7microns to 1000 microns. In practice, the 0.7 to 14 micron band is used for IR temperature measurement. Figure B-1 illustrates the infrared measurement region.

B-1

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Contents Ti20 Limited Warranty and Limitation of Liability Table of Contents Ti20 List of Tables Ti20 List of Figures Ti20 Getting Started IntroductionContacting Fluke Symbols Safety InformationLaser Warning Labels Ti20Unpacking the Imager Standard AccessoriesUnpacking the Imager Ti20 Features and ControlsOperating the Controls Focusing the ImagerUnderstanding the Trigger Ti20Using the AC Power Adapter Using the AC Power AdapterCharging and Replacing the Batteries Using the Battery ChargerReplacing the Battery Pack Installing or Replacing the BatteriesAttaching the Wrist Strap Attaching the Wrist StrapInputs and Connections Connecting the USB CableCleaning Cleaning the CaseMounting the Imager on a Tripod Cleaning the Lens Ti20 Turning the Imager On and Off Basic OperationImager Home Display Zones Understanding the Home DisplayContents of the Home display is described in Table Aiming and Activating the Laser Comparing Frozen Images to Stored Images Capturing ImagesAdjusting the Backlight Setting the Level Setting the Temperature ScalePress Flevel to access the set Level function Adjusting the Span Using Distance to Spot Size Ratio DSManually Activating the Calibration Flag FOV Environmental Conditions Ambient Temperature Derating and Thermal ShockEmissivity Tape methodContact thermometer method Reflected Temperature Compensation Reflected Temperature CompensationTi20 Advanced Imager Operation Data Management and StorageViewing Stored Images Deleting Images Selecting a Palette Adjusting Emissivity Press FNto access the Adjust Emissivity display Adjusting Reflected Temperature Compensation Values Setting Alarm Limits Dag124f.bmp Adjusting Sleep Mode Ti20 Appendices Page Glossary Blackbody Display ResolutionCalibration Calibration SourceFocus Point or Distance Field of View FOVFull Scale Full Scale AccuracyLevel Optical ResolutionMicron or µm Minimum spot sizeResolution Reflected Temperature CompensationRelative Humidity RepeatabilityTemperature Storage Temperature RangeTemperature Coefficient or Ambient Derating Temperature ResolutionWhy use non-contact infrared thermometers? Basics of Infrared MeasurementHow does IR work? What is emissivity? How to assure accurate temperature measurement?What is the distance to spot ratio? How to take temperature measurement?What are some uses for non-contact thermometers? Ti20 Typical Emissivity Values Table C-1. Emissivity Values for Metals Material To 14 µm Table C-1. Emissivity Values for Metals Material To14 µm Tin Unoxidized 0.3 Titanium Polished Typical Emissivity Values Ti20 Thermal SpecificationsOther