User's Manual
Table Of Contents
- 1 Disclaimers
- 2 Safety information
- 3 Notice to user
- 4 Customer help
- 5 Quick Start Guide
- 6 List of accessories and services
- 7 Description
- 8 Operation
- 8.1 Charging the battery
- 8.2 Turning on and turning off the camera
- 8.3 Saving an image
- 8.4 Recalling an image
- 8.5 Deleting an image
- 8.6 Deleting all images
- 8.7 Measuring a temperature using a spotmeter
- 8.8 Measuring the hottest temperature within an area
- 8.9 Measuring the coldest temperature within an area
- 8.10 Hiding measurement tools
- 8.11 Changing the color palette
- 8.12 Working with color alarms
- 8.13 Changing image mode
- 8.14 Changing the temperature scale mode
- 8.15 Setting the emissivity as a surface property
- 8.16 Setting the emissivity as a custom material
- 8.17 Changing the emissivity as a custom value
- 8.18 Changing the reflected apparent temperature
- 8.19 Changing the distance between the object and the camera
- 8.20 Performing a non-uniformity correction (NUC)
- 8.21 Configuring Wi-Fi
- 8.22 Changing the settings
- 8.23 Updating the camera
- 9 Technical data
- 10 Mechanical drawings
- 11 CE Declaration of conformity
- 12 Cleaning the camera
- 13 Application examples
- 14 About FLIR Systems
- 15 Definitions and laws
- 16 Thermographic measurement techniques
- 17 History of infrared technology
- 18 Theory of thermography
- 19 The measurement formula
- 20 Emissivity tables
Thermographic measurement techniques16
5. Measure the apparent temperature of the aluminum foil and write it down. The foil is
considered a perfect reflector, so its apparent temperature equals the reflected appa-
rent temperature from the surroundings.
Figure 16.5 Measuring the apparent temperature of the aluminum foil.
16.2.1.2 Step 2: Determining the emissivity
Follow this procedure:
1. Select a place to put the sample.
2. Determine and set reflected apparent temperature according to the previous
procedure.
3. Put a piece of electrical tape with known high emissivity on the sample.
4. Heat the sample at least 20 K above room temperature. Heating must be reasonably
even.
5. Focus and auto-adjust the camera, and freeze the image.
6. Adjust Level and Span for best image brightness and contrast.
7. Set emissivity to that of the tape (usually 0.97).
8. Measure the temperature of the tape using one of the following measurement
functions:
• Isotherm (helps you to determine both the temperature and how evenly you have
heated the sample)
• Spot (simpler)
• Box Avg (good for surfaces with varying emissivity).
9. Write down the temperature.
10. Move your measurement function to the sample surface.
11. Change the emissivity setting until you read the same temperature as your previous
measurement.
12. Write down the emissivity.
Note
• Avoid forced convection
• Look for a thermally stable surrounding that will not generate spot reflections
• Use high quality tape that you know is not transparent, and has a high emissivity you
are certain of
• This method assumes that the temperature of your tape and the sample surface are
the same. If they are not, your emissivity measurement will be wrong.
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