RayTek ThermoView Ti30 user manual Obtaining the Best Image, Importance of Focusing

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Chapter 4 Obtaining the Best Image

The Importance of Focusing

The focusing ability of the imager is similar to the one found on regular photographic cameras, and it is defined as the ability to adjust the optical system to capture the highest amount of infrared energy from the target, thus allowing the sharpest thermal image of the target to be displayed. Properly focusing the unit is of paramount importance for obtaining a crisp clear image. There is no way to compensate for an improperly focused thermal image afterwards.

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Focus Wheel

Figure 28. Locating the Focus Wheel

Focusing is accomplished by rotating the Focus Wheel in either direction. The minimum focusing distance is 61cm (24 inches). That means you have to be at least 61cm (24 inches) away from your target to get it focused.

Rotating the Focus Wheel to the leftmost position (as viewed from operator’s perspective) will focus the optics to the minimum focus distance of 61cm (24 inches) away from the unit. Rotating the Focus Wheel to the right, the optical system will gradually focus to longer distances. Rotating the Focus Wheel to the furthest right position will focus the optics at infinity.

To make sure your target is in focus, try starting with the Focus Wheel in the leftmost position, rotate slowly to the right, and stop when the image is at its sharpest. You may need to go back and forth until reaching the best focus adjustment. Alternately, you may move in and out while viewing a subject to determine where focus is best.

July 1, 2003

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Contents User’s Manual ThermoView Ti30Contents Qualitative and Quantitative Temperature Measurements Appendix B Infrared Theory Q&A Glossary Warranty Information Customer Service Contact Information Introduction Netd Quick Specifications TableUnpacking Your New Imager First, the Batteries Removing the Battery PackBattery Packs Normal Charge Cycle Charging the Rechargeable Battery PackDocking Station LED Indicators Attaching the Wrist Strap Getting StartedDisplaying Images Turning the Unit OnInformation Screen Normal Mode Keypad Settings and ControlsThermoView Imager Settings Switches icons not shown Laser On/Off Toggle Button ThermoView Imager Settings SwitchesLaser Aperture and Optical Channel JapanesePalette Switch LCD Backlight Illumination SwitchMeasurement Mode Switch Centigrade/Fahrenheit Toggle ButtonFocus Wheel Gain and Level ThumbwheelsAutomatic Semi Automatic Level pointLocation of the Focus Wheel TriggerMain Loop Man Machine Interface Flow ChartsImage Recording Procedure Emissivity Adjustment Procedure July 1 Version Recording an Image Quick Image Fix Procedure Array Recalibration ProcedureRetrieving an Image Retrieve ModeDownloading and Looking at Images Installing the SoftwareHooking Up the Docking Station Connecting the Docking Station to Your ComputerConnecting the USB Connector to the USB Port InsideIR Main Screen at Program Launch Sync button Downloading ImagesDownload Data Screen Saving ImagesContents of Images Folder Setting the Imager ClockJuly 1 Version Looking at Your Downloaded Images Field USB PortViewing Thumbnail Images Viewing a Single Image Obtaining the Best Image Importance of FocusingSelecting the Color Palette Selecting the Measurement ModeLevelGain Min Level Gain Max Level Gain Tip Distance to Target Spot Ratio Qualitative and Quantitative Temperature MeasurementsDS ratio D / S = Optical DiagramField-of-View Environmental Conditions Ambient TemperaturesEmissivity Reflected Temperature CompensationReflected Temperature Compensation File Management Organizing Your DataUploading Data to Your ThermoView Ti30 Imager Uploading Data to the ImagerEditing Data Before Upload RTC OFF Scale Limits Analyzing Your DataSingle Image Screen Sample Image at Original Scale Limits Isotherms Sample Image at Original Isotherm SettingAdditional Image Analysis Tools Temperature Table TabProfile Tab Temperature TableProfile Tab Histogram TabNew Folder Menu BarExit ThermoView Imager InfoFahrenheit CelsiusExport Image Export Temperature TableCreate Report HistogramContents Copy Profile ChartCascade Tile HorizontalThermographic Report Reporting Your FindingsAppendix a Technical Reference Imager Accuracy ChartTypical Emissivity Values Imager Reading Error vs Source DSAluminum Unoxidized Ni-Cu Gob How does IR work? Why use noncontact infrared thermometers?Appendix B Infrared Theory Q&A Emissivity How to assure accurate temperature measurement?Field-of-view Distance to spot ratioWhat are the most popular applications? How to take temperature measurement?Glossary Blackbody Background TemperatureCalibration Calibration SourceDrift Display ResolutionEMI/RFI Noise Far FieldFull Scale Focus Point or DistanceFull Scale Accuracy Gray BodyLoop LaserMicron or µm Minimum spot sizeNon-Gray Body Optical ResolutionOptical Pyrometer Pyroelectric DetectorResolution Reflected Temperature CompensationRelative Humidity RepeatabilityTemperature Storage Temperature RangeTemperature Coefficient or Ambient Derating Spectral ResponseThermal Shock Temperature ResolutionTime Constant Transfer Standard